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BOOK OF ABSTRACT

The 7th International Conference on Mathematics and Natural Sciences 2018, 2-3 November 2018, Bandung, Indonesia

The 7th International Conference on Mathematics and Natural Sciences 2018 2-3 November 2018, Bandung, Indonesia

1

Preface

This volume consists of abstracts presented at the 7th International Conference on Mathematics and Natural Sciences (ICMNS) 2018, which is held at Institut Teknologi Bandung on November 2-3, 2018. This conference was hosted by the Faculty of Mathematics and Natural Sciences (FMIPA) ITB and supported by School of Pharmacy ITB and School of Life Sciences and Technology ITB.

The conference was attended by around 350 participants from universities all around Indonesia, as well as foreign countries. There were 2 keynote talks, 5 plenary speakers in this conference, and 12 invited talks on six mini-symposia. They all come from various fields within the scope of this conference i.e. Chemistry, Physics, Mathematics, Material Science, Computational Science, Medical and Pharmaceutical Sciences, Life Sciences, Environmental Sciences, Science of Renewable Energy, Earth and Space Science.

The organizers are grateful to Fakultas Matematika dan Ilmu Pengetahuan Alam (FMIPA), Sekolah Farmasi (SF), Sekolah Ilmu dan Teknologi Hayati (SITH), Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Bandung, also PT Paragon, for their invaluable supports. We also thank all the scientific and organizing committee members for the excellent works. Our high appreciation is to the keynote speakers: Prof. Hans Z. Munthe-Kaas and Prof. Juan Bisquert, to all the plenary speakers: Dr. Ilya Shadrivov, Dr. Hadi Susanto, Dr. Avan Suinesiaputra, Prof. Matthew Colless, and Dr. Veinardi Suendo, all the invited speakers at the mini-symposia of ICMNS 2018, and also to all the participants for making this conference successful and enjoyable.

Sri Redjeki Pudjaprasetya The 7th ICMNS Organizing Committee

Chairperson


2

Words from the Dean

It is a privilege and an honour for me, as the Dean of Faculty of Mathematics and Natural Sciences (FMIPA ITB), to welcome all of you to the 7th International Conference on Mathematics and Natural Sciences (ICMNS) to be held on November 2-3, 2018 in Bandung Indonesia. This biennial conference is hosted by the Faculty of Mathematics and Natural Sciences in conjunction with the School of Pharmacy and the School of Life Sciences and Technology Institut Teknologi Bandung (ITB).

FMIPA ITB which was originally established in 1947 to produce teachers/ educators for secondary schools has now evolved into an educational institution to prepare scientists and leaders of the nation. The presence of FMIPA ITB to participate in educating the life of the nation, advancing and improving the welfare of the nation continues to provide contribution to the community. Tens of thousands of undergraduate, master and doctoral graduates with high character and competitiveness have been produced for the development of this country. They take part in various fields of industries, government, research institutions, educational institutions, and not a few who succeed as entrepreneurs in various business fields. Innovative and prestigious work has also been carved out by graduates in various fields. Recognition from the national and international academic communities has also been obtained.

In realizing its vision to become a leading faculty, a pioneer in the development of mathematics and science and contributing to the welfare of the nation, FMIPA ITB continuously strives to improve the quality of undergraduate and postgraduate study programs, conduct research in the frontier line and develop innovation for the welfare of the nation. Holding this conference series is one of our agendas to improve the quality of research. New discoveries both in the form of new knowledge and methods will be more easily shared and the cooperative networks will be easily formed when we interact in this kind of forum.


3

I would like to express my gratitude to the keynote and plenary speakers, invited speakers at Mini-Symposia, contributed speakers and all participants. I also sincerely thank the Steering Committee, the Scientific Committee, the Organizing Committee for their hard works. In particular our special thank goes to Prof. Sri Redjeki Pudjaprasetya as the Chair for this conference and, of course, to all sponsors for their contributions to make this conference possible.

I hope that the experiences in this event will be engraved in your memory.

Have a great conference time.

Edy Tri Baskoro Dean

Faculty of Mathematics and Natural Sciences (FMIPA) Institut Teknologi Bandung


4

Table of Contents

Preface..................................................................................................................... 1

Words from the Dean .............................................................................................. 2

Table of Contents .................................................................................................... 4

Computational Mathematics between Dynamics, Geometry and Algebra ........... 24

General photovoltaic principles and operation or organic and perovskite solar cells............................................................................................................................... 25

Terahertz wave manipulation with metasurfaces .................................................. 26

Josephson junctions, localised mode, and resonances .......................................... 27

Mathematical Modelling of Cardiac Shape and Motion: From Patient to Population............................................................................................................................... 28

Surveying the Universe ......................................................................................... 29

General Perspective on the Formation of Continuous Lamellar Morphology in Mesoporous Materials ........................................................................................... 30

Assalaam Observatory, Bringing Astronomy to The Santri ................................. 31

Activities, Roles, and Contributions in North Sumatera....................................... 32

IMAHNOONG: An Observatory Model for Sharing Knowledge and Community Development Based on Astronomy ...................................................................... 33

The Challenges and Opportunities for Astronomy Research at UAD Observatory............................................................................................................................... 34

On collocated and staggered finite volume methods for the shallow water equations............................................................................................................................... 35

Bifurcations Analysis on a Mathematical Model of Metastatic Nasopharyngeal Carcinoma ............................................................................................................. 36


5

Emission Control of Quantum Emitters Based on Novel Active Materials ......... 37

On the Existence of Cubic-Quintic Solitons in Chalcogenide Materials based One Dimensional Photonic Crystal .............................................................................. 38

Impedance and capacitance spectroscopies applied to photovoltaic systems ....... 39

What nanoscale back-contact can do for perovskite-silicon tandem solar cells? . 40

Design theory from the viewpoint of algebraic combinatorics ............................. 41

A survey on tight Euclidean t-designs .................................................................. 42

[ABS-139] ITERA Astronomical Observatory: Feasibility study in Mt. Betung, Lampung, Sumatera and critical assessment as center of education and research for the future ............................................................................................................... 43

[ABS-155] Introduction of e-Maya Observatory .................................................. 44

[ABS-200] The Development of Islamic Astronomy Observatory in UINSA Surabaya ................................................................................................................ 45

[ABS-220] Walisongo Planetarium As strengthener of Falak Scientific Distinction of UIN Walisongo ................................................................................................. 46

[ABS-247] Construction of space observation facilities in Nusa Tenggara Timur............................................................................................................................... 47

[ABS-264] Seiches in a Closed Basin of Various Geometric Shape .................... 48

[ABS-23] SPH simulation of surge waves generated by aerial and submarine landslides............................................................................................................... 49

[ABS-280] Measurement of Suspended Sediment Concentration in Seribu Island using Acoustic Doppler Current Profiler .............................................................. 50

[ABS-303] The Optimal Shape of Sinusoidal Shaped Submerged Breakwater in Reducing Wave Amplitudes ................................................................................. 51

[ABS-70] Fishery productivity in the Suitable Location for FADs Placement with Landsat 8 Imagery................................................................................................. 52

[ABS-74] Two-layer non-hydrostatic scheme for simulations of wave runup ..... 53


6

[ABS-330] UNDERWATER OBJECT DETECTION USING SCIENTIFIC ECHOSOUNDER ................................................................................................. 54

[ABS-79] Mangrove density impacts on tidal dynamic in Segara Anakan Lagoon, Indonesia ............................................................................................................... 55

[ABS-86] Flow generating surface wave .............................................................. 56

[ABS-91] Numerical Solution of Surface Wave Generated by A Uniform Flow Disturbed by A Bump ........................................................................................... 57

[ABS-115] A Numerical Study of Tidal Bores..................................................... 58

[ABS-147] Separating incident and reflected spectra in wave flumes with mangrove............................................................................................................................... 59

[ABS-191] Ocean Circulation in Pari Island - Jakarta, Indonesia ........................ 60

[ABS-218] Model of Sediment Movement For Sea Boundary Monitoring in Torasi River – Indonesian Water Border Based on Its Coastal Morphology Dynamics . 61

[ABS-246] Numerical Study on the Influence of an Incident Waveform on Tsunami Run-up................................................................................................................... 62

[ABS-36] H-relative Systems Computation for System of Ordinary Difference Equations Derived from A sine-Gordon Equation................................................ 63

[ABS-62] Infinitely many Equilibria and Some Codimension One Bifurcation in a Two Prey One Predator Dynamical System ......................................................... 64

[ABS-81] Application of Lagrange Multiplier Method for Computing Cusp Point In A System of Ordinary Differential Equations .................................................. 65

[ABS-126] Mie Scattering Modes Analysis of Rotated Finite Cylinder .............. 66

[ABS-138] Heating with Metal Nano Particles .................................................... 67

[ABS-145] Spatial Dispersion and Tensorial Analysis of Second and Third Harmonic Generation in Diamond and Zincblende Semiconductors ................... 68

[ABS-173] Asymmetric Dielectric Nanorods for Scattering Pattern Shaping ..... 69


7

[ABS-178] Study on the profile depth effect on the field intensity distribution of surface plasmon polariton and its spectral shape in one dimensional periodic dielectric/metal structure ....................................................................................... 70

[ABS-179] Fabrications of Tapered Optical Fibers by Laser Induced Photopolymerization Technique ........................................................................... 71

[ABS-181] Spectral analysis of Surface Plasmon Resonance in the 0th diffraction order of one-dimensional periodic Al nanostructure ............................................ 72

[ABS-227] Coulomb Explosion Phenomenon as Effect of Irradiation Time in Au-Ag Nanoalloys Synthesized Femtosecond Laser .................................................. 73

[ABS-124] Electrochemical Deposition of Graphene Oxide as Buffer Material of 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 Working Electrode in DSSC....................................................................... 74

[ABS-127] Study on the Effect of PVDF and 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 Composition on Quasi-Solid State DSSC............................................................................................................ 75

[ABS-146] PRELIMINARY RESULT ON THE rGO FUNCTIONALIZATION AS COUNTER-ELECTRODE IN DYE-SENSITIZED SOLAR CELLS (DSSC)............................................................................................................................... 76

[ABS-151] Photocurrent Enhancement by Localized Surface Plasmon Resonance of Gold and Silver Nanoparticles in Dye Sensitized solar Cells .......................... 77

[ABS-177] Characteristics of Quasi-Solid State DSSC using Poly-ionic liquid Electrolyte ............................................................................................................. 78

[ABS-185] Influence of Humid Atmosphere during the Perovskite Layer Preparation on the Characteristics of Its Solar Cells ............................................ 79

[ABS-257] Explicit constructions of spherical designs from ball designs and simplex designs ..................................................................................................... 80

[ABS-266] Complementary Ramsey numbers and Ramsey graphs ..................... 81

[ABS-119] On Ramsey (𝒎𝒎𝒎𝒎𝑻𝑻,𝑷𝑷𝑷𝑷)-minimal graphs .......................................... 82

[ABS-154] Study of Ocean Current Energy Potential in Lembeh Strait Using 3-Dimension Hydrodynamic Model......................................................................... 83

[ABS-243] Methods to obtain complementary sequences.................................... 84


8

[ABS-263] The Optimation of Diels-Alderase Activity from the root culture of Morus shalun ......................................................................................................... 85

[ABS-267] Synthesis of 𝑭𝑭𝑭𝑭𝑭𝑭𝑻𝑻𝑭𝑭 Nanoparticles for Colour Removal of Printing Ink Solution ................................................................................................................. 86

[ABS-13] A New Way to Improve Physicochemical Properties of Potato Starch 87

[ABS-19] Improvement Strategies of Coulometric Microdevice Based on Metallization Principle .......................................................................................... 88

[ABS-278] Systematic Study on Sensing Capability of Gold(I) Pyrazolate Complex for Vapochromic Phosphorescent Chemosensors of Ethanol Vapors .................. 89

[ABS-281] Synthesis and Characterization of Zn(II) Complex with (E)-2-((2-hydroxybenzylidene)amino)acetic acid ligand as Antidiabetic Type 2 ................ 90

[ABS-283] Secondary Metabolites from Aspergillus terreus, an endophytic fungus of sponge Aaptos suberitoides from Taman Nasional Kepulauan Seribu ............ 91

[ABS-287] The Synthesis of 3-(2-Hydroxyphenyl)-1-phenylprop-2-en-1-one in Imidazole-Derivative Ionic Liquid Medium Utilizing MAOS (Microwave Assisted Organic Synthesis) ................................................................................................ 92

[ABS-290] The Synthesis of Glutaraldehyde-modified Chitosan Utilizing MAOS (Microwave Assisted Organic Synthesis) Method as Adsorbent of Pb(II) Ions Contained in Water Sample of Cikapundung River - Bandung ............................ 93

[ABS-292] Biodiversity study of Indonesia marine microalgae........................... 94

[ABS-294] The Effects of Lithium Acetate Content towards the Properties of Cellulose Acetate-Based Solid Polymer Electrolyte for Lithium Ion Battery ...... 95

[ABS-306] Free Energy Calculation of Glucose and it’s Derivative using Classical Molecular Dynamics as Enhanced Oil Recovery Agent ....................................... 96

[ABS-309] Synthesis Strategy of Nanostructured Titania with bcl Morphology . 97

[ABS-315] Genetic Marker for Identifying Species of Microalgae ..................... 98

[ABS-96] Effect of cacao bean fermentation using starter of lactic acid bacteria and yeast on flavonoids formation and antioxidant activity ........................................ 99


9

[ABS-142] Study of Electrochemical Properties of Oxovanadium Complexes in Imidazol-based Ionic Liquids ............................................................................. 100

[ABS-153] Study of the Electrochemical Properties of Complex Tris(2-(1H-Pyrazol-1-yl) Pyridine) Cobalt (II) in Imidazole-based Ionic Liquids ............... 101

[ABS-182] Olefin Epoxidation Catalyzed by dioxomolybdenum(VI) Complex at Cu-MOF-2........................................................................................................... 102

[ABS-192] The Properties of Microcellulose as Enhanced Oil Recovery Agent103

[ABS-232] Deoxygenation and Asymmetric Dihydroxylation of Benzyl-Protected Robtein Chalcone in A Synthetic Route to (–)-Robidanol ................................. 104

[ABS-233] In-Vitro Study of DNA Adduct 8-Hydroxy-2-Deoxiguanosine Formation from 2’-Deoxyguanosine Exposure Against Benzo[a]pyrene and Ni (II) Compounds Through Fenton-Like Reactions ..................................................... 105

[ABS-234] SYNTHESIS OF 3-PRENYLFLAVONE FROM PHENOL: STUDY OF LEWIS ACIDS IN FRIES REARRANGEMENT OF PHENYL ACETATE............................................................................................................................. 106

[ABS-239] Dissolution Study of Purified Bromelain from Pineapple Core (Ananas comosus [L.] merr) Encapsulated in Alginate-Chitosan Microcapsule .............. 107

[ABS-252] Microwave Assisted Amidation of 5-Amino-isophthalic acid dimethyl ester Catalyzed by Imidazolium based Ionic Liquids ......................................... 108

[ABS-1] Staggered Scheme for Shallow Water Equations with Quadtree-subgrid............................................................................................................................. 109

[ABS-269] An Artificial Neural Network Approach in Predicting Career Track of Incoming Senior High School Students .............................................................. 110

[ABS-25] E-SIBAYU: A Tele-Monitoring App for Saving Pregnant Mothers and Babies .................................................................................................................. 111

[ABS-27] New Lagrange-Galerkin Scheme for Solving Fluid Flow in Non-homogeneous Porous Medium ............................................................................ 112

[ABS-37] Physical Parameters and Atmospheric Model of Alpha Tau at AGB Evolutionary Stage .............................................................................................. 113


10

[ABS-64] Handwritten Mathematics Symbol Recognition Using Multi Kernel Support Vector Machine ..................................................................................... 114

[ABS-133] Stochastic Simulation of Yeast Cells and Its Colony Growth by Using Circular Granular Model for Cases of Growth and Birth Probabilities Depends on Position ............................................................................................................... 115

[ABS-137] Network Analysis of Saccharomyces Cerevisiae Colony: Relation between Spatial Position and Generation ........................................................... 116

[ABS-152] Traffic Flow Simulation using Agent-Based Model ........................ 117

[ABS-204] Change in Falling velocity of Natural Sand to Mass and Size Variations............................................................................................................................. 118

[ABS-256] Morphodynamic and hydrodynamic conditions which controlled Quartz Detritals and Heavyminerals deposites on Senunu Canyon, Sumbawa, Indonesia ............................................................................................................. 119

[ABS-2] The Data of Sky Brightness Observation of Depok City from March 2017 to February 2018 Using Sky Quality Meter (SQM) ........................................... 120

[ABS-21] A Search of Diffuse Insterstellar Bands in Planetary Nebulae Environment ........................................................................................................ 121

[ABS-39] Modelling Brazil Nut Effect Phenomenon of Boulders on Asteroid Surface ................................................................................................................ 122

[ABS-40] Possibility of C/2002 CE10 in State of Retrograde-Polar Resonance with Saturn in the Future ............................................................................................. 123

[ABS-296] EXOPLANETS’ SEMIMAJOR AXIS PREDICTION USING HARMONIC ORBIT RESONANCE MODEL.................................................. 124

[ABS-42] A Search for Extragalactic Diffuse Interstellar Bands ....................... 125

[ABS-298] Tracing Galactic Arm by Using Diffuse Interstellar Bands and Gaia DR2 ..................................................................................................................... 126

[ABS-44] Effect of Magnetic Field on the Rotation Curves of Spiral Galaxies 127

[ABS-310] Expansion Velocity of Selected Planetary Nebulae from MASH Data Archive ................................................................................................................ 128


11

[ABS-311] Abundances and Excitation Class of Selected Planetary Nebulae from MASH Data Archive........................................................................................... 129

[ABS-314] Reports on Sky Brightness, Seeing, and Weather Measurement at Timau Observatory, East Nusa Tenggara ........................................................... 130

[ABS-67] Lyman Alpha Forest in Lensed Quasar Spectra ................................. 131

[ABS-75] Rapid Orbital Plane Oscillation of Retrograde Near-Earth Asteroid 2009 HC82 ................................................................................................................... 132

[ABS-84] Analysis of Tortuosity and Percolation Probability on 3 Dimensional Rock Models with Different Model Sizes .......................................................... 133

[ABS-87] SHEAR WAVE VELOCITY ANALYSIS OF 2-D MULTICHANNEL ANALYSIS OF SURFACE WAVE (MASW) TO INVESTIGATE SUBSURFACE FAULT OF ALTERNATIVE BRIDGE CONSTRUCTION IN KELOK SAGO JAMBI ...................................................................................... 134

[ABS-88] Photmetric Observation of WASP-52 b and TrES-3 b ...................... 135

[ABS-97] Model Parameter Determination of Magnetotelluric (MT) Data Using Non-Dominated Sorting Genetic Algorithm II (NSGA-II) ................................ 136

[ABS-111] Analysis of Wall-Effect on Particle Deposition in Fluid Using Experimental and Numerical Methods ............................................................... 137

[ABS-120] Source detection on interferometric image: ALMA simulated and real data ...................................................................................................................... 138

[ABS-130] Three Dimension Multiphase Flow Modelling Using Lattice Boltzmann Method Rothman-Keller With Linear Temperature Gradient ............................ 139

[ABS-131] Determination of the Orbital Elements of Sirius AB ....................... 140

[ABS-132] Automation of Reduction and Analysis of Chandra X-Ray Satellite Data for Studies of Clusters of Galaxies ............................................................. 141

[ABS-143] Memory based Hybrid Dragonfly Algorithm (MHDA): a New Technique for Determining Model Parameter in Vertical Electrical Sounding (VES) Data .......................................................................................................... 142


12

[ABS-144] First light curve analysis of eclipsing binary system ASAS 185542-0123.1.................................................................................................................. 143

[ABS-150] Study of management and development of Observatorium Astronomi ITERA Lampung (OAIL) area............................................................................ 144

[ABS-157] Long Term Behavior of Blazar OJ 287 in Optic, UV, and X-ray .... 145

[ABS-170] Constraints on Dark Energy models in Cosmology from Double Source Plane Strong Lenses system ................................................................................ 146

[ABS-176] Morphology and Evolution of Coronal Holes in Multiple Wavelength............................................................................................................................. 147

[ABS-184] 3D Seismic Velocity Structure Imaging Beneath Flores Region Using Local Earthquake Tomography........................................................................... 148

[ABS-187] Imaging and Spectroscopic Observations of Total Lunar Eclipse July 2018..................................................................................................................... 149

[ABS-203] Application of CSAMT and Magnetic Methods to Determine Subsurface Structure of Tangkuban Parahu Area ............................................... 150

[ABS-206] The Study Of The Electron Enhancements During Garuda-1 Satellite Anomaly .............................................................................................................. 151

[ABS-207] Tracing Stellar Close Encounter with Our Sun in GAIA-LAMOST-RAVE Catalogues ............................................................................................... 152

[ABS-208] A STUDY THE POSITION OF PRE-CONJUNCTION MOON AT THE SUNSET TIME WITH POSITIVE ALTITUDE IN INDONESIAN REGION............................................................................................................................. 153

[ABS-230] Diagenesis and Porosity Development of Gumai Carbonate Formation in “NA” Field, Sunda Basin ................................................................................ 154

[ABS-277] Primary Productivity of Blanakan Fishpond at Subang, West Java. 155

[ABS-279] Network approach on characterizing floral diversity in the agroforestry zone of Mount Makiling Forest Reserve, Philippines ........................................ 156

[ABS-297] Measurement of The Night Sky Brightness in e-Maya Observatory 157


13

[ABS-60] Total and labile fraction of metals in surface sediments from Jakarta Bay, Jakarta, Indonesia ................................................................................................ 158

[ABS-61] Heavy metals fractionation in surface sediments from Surabaya Waters, East Java, Indonesia ............................................................................................ 159

[ABS-331] Identification Of Surface Area I Unit I Sarulla Geothermal Power Using Satellite Image In Pahae Jae District,Tapanuli Regency North .......................... 160

[ABS-94] Water Critical Level in Karst Gombong Selatan and Surrounding Area Kebumen Regency, Indonesia ............................................................................ 161

[ABS-134] The Effect of Leather Tanning Wastewater on Paddy Fields, a case study in Garut District, West Java ...................................................................... 162

[ABS-172] Optimizing Photoperiodism, Growth Media Dilution, and Frequency of Inoculum Addition in Microalgae (Chlorella vulgaris) Culture Using Bioslurry (ADDMW) as Growth Media ............................................................................. 163

[ABS-183] Adsorption Studies of Removal Chromium (Cr) from Electroplating Wastewater Using Activated Carbon (Coconut Shell)) ...................................... 164

[ABS-205] Analysis of Organic Micropollutants in the Surface Sediment and Mud Clams (Polymesoda erosa) Samples from Segara Anakan Lagoon (SAL), Cilacap, Indonesia ............................................................................................................. 165

[ABS-216] Metals Content In Edible Gastropod From Blanakan Silvofishery Ponds............................................................................................................................. 166

[ABS-270] Visualization of Microlejeunea Oil Body by using Transmission Electron Microscopy ........................................................................................... 167

[ABS-271] The Effect of DryingStep in the Preparation of Microlejeunea for Scanning Electron Microscopy Observation ...................................................... 168

[ABS-18] The Abundance of Macrozoobenthos in Lematang River, South Sumatera, Indonesia ............................................................................................ 169

[ABS-275] The Effects of Blue Light Exposure to Beta Brain Wave for Night Driving Activity in a Car-Driving Simulator ...................................................... 170

[ABS-45] Peppermint (Mentha piperita) as Antidepressant on Male Wistar Rat (Rattus rattus) Exposed to Blue Light ................................................................. 171


14

[ABS-112] Inventory of Local Rice Cultivars in Ponorogo ............................... 172

[ABS-129] EFFECT OF ALUMINUM STRESS ON ONION (Allium Cepa L.)............................................................................................................................. 173

[ABS-135] Prospect of Tagetes erecta Linn. to Control Cylas formicarius Fabr. on Ubi Cilembu (Ipomoea batatas Var. Rancing) .................................................... 174

[ABS-161] Analysis of Phosphate Solubilizing Bacteria from Mangrove Sediments and Their Relation to Bird Presence in Pulau Rambut Wildlife Reserve, Indonesia............................................................................................................................. 175

[ABS-162] Numerical Model Development on Ultrasound-Assisted Extraction Process for Production of Nutmeg (Myristica fragrans Houtt) Oleoresin ......... 176

[ABS-166] Optimization Steam Time Of Human Hair Waste To Improve Plant Media Quality And Growth Of Leaf-Lettuce Plant (Lactuca Sativa L.) ............ 177

[ABS-167] Pollen Fluorochromatic Reaction in two varieties of cocoa (Theobroma cacao L.) ............................................................................................................. 178

[ABS-169] Estimation of Carbon Stock in the Mangrove Ecosystem of Pulau Rambut Wildlife Reserve, Indonesia .................................................................. 179

[ABS-188] SENSORY EVALUATION OF MANGOES GROWN IN DIFFERENT REGION OF ACEH TAMIANG DISTRICT, ACEH, INDONESIA............................................................................................................................. 180

[ABS-194] Edible Wild Fruit Contribution for Food Security, Food Diversity, and Household Income in the Leuser Ecosystem Area of Aceh Tamiang District ... 181

[ABS-210] Traditional storage to extend the shelf life of mutant cassava ......... 182

[ABS-211] Survival and Reproductive Value of Hermetia illucens (Diptera: Stratiomyidae) on Vegetable and Fruits Waste Rearing Substrates ................... 183

[ABS-215] Authentication of Honey from Apis Cerana Fab.: Pollen Diversity and Chemical Composition........................................................................................ 184

[ABS-221] 16S rRNA Gene Sequences Analysis of Thermophilic Actinobacteria Isolated from Soil in Cisolok Geothermal Area, West Java, Indonesia.............. 185


15

[ABS-222] Assessing Thermostable Xylanase from Thermophilic Actinobacteria Isolated in a Geothermal Area, West Java, Indonesia ........................................ 186

[ABS-223] A Comparison of Agar and Gellan Gum as Solidifying Agent in Stimulating Sporulation in Rare Thermophilic Actinobacteria .......................... 187

[ABS-224] Thermostable Cellulolytic Enzyme-Producing Thermophilic Actinobacteria Isolated from a Geothermal Area in West Java, Indonesia ........ 188

[ABS-225] Screening of Thermostable Amylolytic Enzyme-Producing Thermophilic Actinobacteria Isolated from a Geothermal Area in West Java, Indonesia ............................................................................................................. 189

[ABS-235] Landslide Vulnerability Mapping in Batur District, Banjarnegara Regency, Central Java Province ......................................................................... 190

[ABS-237] Analysis of AGAMOUS Gene Expression in Hibiscus rosa-sinensis L. Single Pink, Crested Peach, and Double Orange Flowers .................................. 191

[ABS-238] The Effects of Blue Light Exposure to Alpha Brain Wave for Night Driving Activity in a Car-Driving Simulator ...................................................... 192

[ABS-248] Effect of Sound Vibration on Proline Levels in Spinach Plants (Amaranthus viridis) ........................................................................................... 193

[ABS-253] Antimicrobial Activity and Metabolite Characterization of Lichens-Associated Actinomycetes Isolated from Cibinong Science Center (CSC) West Java ..................................................................................................................... 194

[ABS-282] ORGANIC DIAMINE PILLAR POSITION OF 𝑯𝑯𝑭𝑭𝑯𝑯 − 𝑪𝑪𝑯𝑯𝑻𝑻𝑷𝑷 −𝑯𝑯𝑯𝑯𝑭𝑭.𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑭𝑭 HYBRID WITH n = 3-4 ............................................................... 195

[ABS-28] Novel Biopolymer electrolyte membranes of 𝑳𝑳𝑻𝑻𝑪𝑪𝑪𝑪𝑻𝑻𝑭𝑭– complexed Methylcellulose for Lithium-ion Batteries (LIBs) application: Conductivity Studies and Mechanical Properties .................................................................................. 196

[ABS-300] THE SYNTHESIS OF CELLULOSE ACETATE/LITHIUM ACETATE/CELLULOSE PHTHALATE POLYMER ELECTROLYTE MEMBRANES FOR LITHIUM ION BATTERIES APPLICATION ............... 197

[ABS-308] Various High Temperature Synthesis of Polyaniline for Dye Sensitized Solar Cell (DSSC) ............................................................................................... 198


16

[ABS-313] The Effect of Leaf Extract Addition on the Formation of ZnO Nanoparticles using LASIS Technique ............................................................... 199

[ABS-156] Esterification of Starch Using Itaconic Anhydride .......................... 200

[ABS-158] Synthesis and characterization of starch-g-poly(cinnamic acid) ..... 201

[ABS-160] Effect of Ionic Liquids Addition on Electrodeposition Process of Ni-W/SiC Composite ............................................................................................... 202

[ABS-163] Synthesis of Spherical Nanostructured γ-Al2O3 Particles using Cetyltrimethylammonium Bromide (CTAB) Reverse Micelle Templating ....... 203

[ABS-250] The Role of MgO as Swelling Cements Admixtures under CO2 Attack on API Class-G Cement ...................................................................................... 204

[ABS-260] Parameter Estimations of Fuzzy Forced Duffing Equation: Numerical Performances by Extended Runge-Kutta Method .............................................. 205

[ABS-261] Subtractive 𝝓𝝓-Weakly Prime Ideal in Semiring .............................. 206

[ABS-11] The Boundedness of Fractional Integral Operators on Morrey Spaces over Hypergroups................................................................................................ 206

[ABS-265] Model of Deposit and Loan of a Bank Using Spiral Dynamics Optimization Method .......................................................................................... 207

[ABS-16] A Bitcoin Mining Project using Real Option ..................................... 208

[ABS-272] On The Total Vertex Irregularity Strength of Some Graphs Obtained from Star ............................................................................................................. 209

[ABS-17] Implementation of Fuzzy Linear Programming on Estimating Production Cost of Petroleum Refineries .............................................................................. 210

[ABS-273] Claim IBNR Estimation Using GLM Approached by Tweedie Distribution ......................................................................................................... 211

[ABS-274] On The Total Edge Irregularity Strength of Some Copies of Books Graphs ................................................................................................................. 212

[ABS-20] Simulation of Drift Diffusion Process in A p-n Junction System ...... 212


17

[ABS-276] THE MULTISET DIMENSION OF CIRCULANT GRAPH ......... 213

[ABS-24] On size multipartite Ramsey numbers for 𝒎𝒎𝒎𝒎𝒎𝒎,𝑷𝑷 versus 𝒎𝒎𝒎𝒎,𝑭𝑭 ...... 214

[ABS-26] Bayesian Quantile Regression Method to Construct the Low Birth Weight Model ..................................................................................................... 215

[ABS-284] On The Centroidal Dimension of Join and Corona Product Graphs 216

[ABS-30] A Kaldor model for economic cycle: Data fitting .............................. 217

[ABS-288] Remarks on Multiplicative Generalized Derivations in 3-Prime Near-Rings ................................................................................................................... 217

[ABS-31] MODELING HOT WATER BATH TREATMENT OF TROPICAL FRUIT USING LATERAL METHODS OF LINES .......................................... 218

[ABS-33] Optimal Control of Drug Therapy and Virotherapy via Linear Parameter Varying (LPV) Approach ................................................................................... 219

[ABS-289] Introducing Fermat Sequences ......................................................... 220

[ABS-34] Angle between Two Images of the Same Size ................................... 221

[ABS-291] THE MINIMAL SIZE OF RAINBOW 3-CONNECTED GRAPH 222

[ABS-293] The Locating Chromatic Number Of Lobster Graph 𝑳𝑳𝑷𝑷,𝒎𝒎,𝒎𝒎 For 𝒎𝒎 = 𝑭𝑭,𝑭𝑭,𝟓𝟓.................................................................................................................. 223

[ABS-41] Unicyclic Ramsey (P3,Pn)-minimal graphs obtained from trees in the same class............................................................................................................ 224

[ABS-43] The Gram-Schmidt Process on An Indefinite Inner Product Space ... 225

[ABS-312] Heat Equation in Cycle Metric Graph .............................................. 225

[ABS-46] On the Free Boundary Problem for the Compressible Fluid Flow of the Oldroyd-B Model with Surface Tension in the Maximal Lp-Lq Regularity Class............................................................................................................................. 226

[ABS-47] Generalized STAR (1;1) Model with Outlier - Case Study of Begal in Medan, North Sumatera ...................................................................................... 227


18

[ABS-48] I-Primal Submodules .......................................................................... 228

[ABS-304] An Optimal Integrated Vector Control for Prevention the Transmission of Dengue ............................................................................................................ 229

[ABS-305] Clustering for item delivery and execution ...................................... 230

[ABS-50] Bayesian Forecasting for Time Series of Count Data ........................ 231

[ABS-307] The Comparison of Laplacian Operators Spectrum between Weighted Directed and Metric Graphs ................................................................................ 232

[ABS-53] Codes over an Infinite Family of Non-Chain Rings .......................... 233

[ABS-54] Robust 𝑯𝑯∞ Controller for Bilinear System to Minimize HIV Concentration in Blood Plasma .......................................................................... 234

[ABS-56] A Fuzzy Basic Reproduction Number For A Fuzzy Smoker Growth Model .................................................................................................................. 235

[ABS-57] Linear Codes over 𝑹𝑹 ∶= ℤ𝒑𝒑𝒑𝒑 + 𝑪𝑪ℤ𝒑𝒑𝒑𝒑 + 𝒗𝒗ℤ𝒑𝒑𝒑𝒑 + 𝑪𝑪𝒗𝒗ℤ𝒑𝒑𝒑𝒑 ........... 236

[ABS-80] The connected size Ramsey numbers for 𝑻𝑻𝒎𝒎𝑻𝑻 versus tree ................ 237

[ABS-58] Total Vertex Irregularity Strength for Cartesian Product of Stars ..... 238

[ABS-59] SUCCESSIVE METHOD APPROXIMATION FOR ROBUST CONTROL OF BILINEAR SYSTEMS ............................................................. 239

[ABS-319] Optimal Design of The Revised Double Sampling X Chart Based on Median Run Length ............................................................................................ 240

[ABS-320] The Modeling of Spatial-Time Series Count Data with High Zeros Frequency using Zero Inflated Poisson (ZIP) Autoregression ........................... 241

[ABS-66] Optimal Control of Water Hyacinth and Grass Carp Fish for Harvesting Strategy using Firefly Algorithm ........................................................................ 242

[ABS-69] A multi objective firefly algorithm for practical portfolio optimization problem ............................................................................................................... 243

[ABS-71] THE NON-ISOLATED RESOLVING NUMBER OF CORONA GRAPHS ............................................................................................................. 244


19

[ABS-78] Mixed Metric Dimension of Corona Product Graph.......................... 245

[ABS-83] The comparative analysis of dependence for three-way contingency table using Burt matrix and Tucker3 in correspondence analysis ............................... 246

[ABS-90] On Non-isolated Resolving Number of a Graph Cartesian Product with a Star ................................................................................................................... 247

[ABS-93] On The Rainbow Connection Number and Strong Rainbow Connection Number of Generalized Triangle-Ladder Graph................................................. 248

[ABS-110] Some Graphs with Small Partition Dimension ................................ 249

[ABS-113] Performance Based Preventive Maintenance For A Remanufactured Equipment Lease Contract .................................................................................. 250

[ABS-114] On the Locating-chromatic Numbers of Subdivisions of Friendship Graph................................................................................................................... 251

[ABS-117] Generalized Least Square Method for Estimating Parameter of Demand Function of Animal Protein In Indonesia............................................................ 252

[ABS-118] Uniserial Dimension of Finitely Generated Primary Modules Over Discret Valuation Domain .................................................................................. 253

[ABS-121] The strong rainbow 2-connectivity of some subdivided wheels ...... 254

[ABS-122] Optimal Decisions for Two Dimensional Maintenance Service Contract Involving Three Parties (manufacturer, agent and consumer) in Cooperative and Competitive Situations ........................................................................................ 255

[ABS-123] Comparison of Adams-Bashforth-Moulton Order 4, 5 and 6 Methods in Analyzing Errors and Simulation Results of Vertical and Torsional Oscillation on String Model .................................................................................................. 256

[ABS-125] (C(k), C(k+1)) −Supermagic Labellings of Cupola Graph Cu(k, k+1, n)............................................................................................................................. 257

[ABS-128] Analysis of a three-phase vs a four-phase trafic lights regulation for a four-leg intersection ............................................................................................ 258

[ABS-140] Geometric Asian Rainbow Put Options under Fractional Brownian Motion ................................................................................................................. 259


20

[ABS-141] Generalization of Non One Sided Bounded Variation Sequences and Applications ........................................................................................................ 260

[ABS-165] Stability and Bifurcation of Bird Flu Transmission Model ............. 261

[ABS-180] The strong 3-rainbow index of some subdivided graphs ................. 262

[ABS-190] Isomorphism between Endomorphism Rings of Modules Over a Semisimple Ring ................................................................................................. 263

[ABS-196] Predictive Analysis of Employee Loyalty: A Comparative Study Using Logistic Regression Model and Artificial Neural Network ................................ 264

[ABS-202] Mean Variance Skewness Kurtosis Superskewness (MVSKS) Portfolio Optimization with One Constraint ...................................................................... 265

[ABS-209] A Model of Customer Lifetime Value using Marcov Chain with Dynamical Interest Rates .................................................................................... 266

[ABS-217] Probability Of Failure Model In Mechanical Component Because Of Fatigue................................................................................................................. 267

[ABS-228] Feedback Inhibition Effects on the Dynamics of the Metabolites on the Central Metabolism of the Yeast Cells ............................................................... 268

[ABS-229] Individual Tribe Determination Algorithm on a Matrilineal System............................................................................................................................. 269

[ABS-251] Smaradanche Q-fuzzy Ring ............................................................. 269

[ABS-236] Global Stability and Sensitivity Analysis of SIA Model for AIDS Disease ................................................................................................................ 270

[ABS-14] Molecular Modeling of Porphyrin Derivatives as Bcl-2 Inhibitor ..... 271

[ABS-15] Virtual Screening for Identification of β5 Subunit of 20S Proteasome............................................................................................................................. 272

[ABS-35] Optimization of Coulometric Microdevice for Protein Detection Based on Metallization Principle ................................................................................... 273


21

[ABS-49] Reverse transcriptase inhibitor resistance among HIV infected people with viral load > 10,000 copies/mL in Nabire, Jayapura, and Jayawijaya, Papua Province .............................................................................................................. 274

[ABS-55] Effect of Action Observation in Enhancing Motor Imagery for BCI Control System Exercise ..................................................................................... 275

[ABS-254] Enzymatic Synthesis of Glyserol-Coconut Oil Fatty Acid and Glycerol-Decanoic Acis Ester as Emulsifier and Antimicrobial Agents Using Candida rugosa Lipase EC 3.1.1.3 ................................................................................................ 276

[ABS-3] Non-linearity analysis for cosmological inflation model with minimal and non-minimal coupling of scalar field from Horndeski theory ............................ 277

[ABS-4] Chaotic Behavior of Modified Hamiltonian Peyrard-Bishop-Dauxois Model on DNA System ....................................................................................... 278

[ABS-5] The Parameterized Post-Friedmannian Framework for Nonminimal Derivative Coupling with General Cosmological Perturbation Metric .............. 279

[ABS-6] Driving the Dephasing Assisted Quantum Transport .......................... 280

[ABS-262] Word of Mouth Innovation Diffusion .............................................. 281

[ABS-7] Ernst Potential of Near-Horizon Extremal Kerr Black Holes .............. 282

[ABS-8] Triangular inequality for 3d Euclidean manifold in loop quantum gravity............................................................................................................................. 283

[ABS-10] Spectral Analysis of Volume Operator in Loop Quantum Gravity for Kinematical Case ................................................................................................ 284

[ABS-268] Quasiparticle electronic structure of ZT-MoS2 within GW approximation ..................................................................................................... 285

[ABS-38] The Changes of Cilinders Shaped Wet Granulars Structure During Heating Process ................................................................................................... 286

[ABS-295] Optical Characteristic Properties of Yakult Drink Using UV/Vis Spectrophotometer and FTIR .............................................................................. 287


22

[ABS-299] DESIGNING A LOW-COST SURFACE PLASMON RESONANCE (SPR) INSTRUMENT FOR MONITORING DEGRADATION OF MILK QUALITY ........................................................................................................... 288

[ABS-302] GAS DETECTION USING SURFACE PLASMON RESONANCE METHOD FOR CHARACTERIZATION OF GAS REFRACTIVE INDEX PRODUCED BY MILK ..................................................................................... 289

[ABS-51] Global Existence of Maxwell Klein-Gordon Theory with General Couplings ............................................................................................................ 290

[ABS-52] Tumor Control Probability (TCP) And Normal Tissue Complications Probability (NTCP) with Consideration Of Cell Biological Effect .................... 291

[ABS-316] The Influence of Light Wavelengths toward The Growth of Brassica rapa L .................................................................................................................. 292

[ABS-317] Coupling Parameter Constrain of Nonminimal Derivative Coupling(NMDC) of Scalar Field Cosmology Using Strong Energy Condition in Modified Einstein Theory ................................................................................... 293

[ABS-318] Combinatorial flow induced by quantum walks .............................. 294

[ABS-72] Development of Internet of Things (IoT) Technology and Its Applications on Room Cooling System .............................................................. 295

[ABS-76] Fast forward of adiabatic spin dynamics : An application to quantum annealing model in triangle spin systems ........................................................... 296

[ABS-136] Determination of Environmental Condition in Pelita Harapan University Based on Radon Concentration Analysis .......................................... 297

[ABS-175] Network Analysis of Saccharomyces Cerevisiae ............................. 298

[ABS-186] Inflation model due to non-minimal coupled Higgs to the Starobinskys modified gravity .................................................................................................. 299

[ABS-189] One-Dimensional Analysis of Magnetic Dipole Cylinder Inside An External Magnetic Field ...................................................................................... 300

[ABS-219] 𝒎𝒎 + 𝚲𝚲 and 𝒎𝒎 + 𝚺𝚺𝟎𝟎 photoproduction in view of new CLAS data .... 301

[ABS-226] Isobar Model for Kaon Electroproduction ....................................... 302


23

[ABS-231] k+Λ-k0Λ Photoproduction Studied by Using Isobar Model ........... 303

[ABS-240] Structural and vibrational analysis of LaFe1-xMnxO3 (x = 0.05, 0.10, 0.15, and 0.20) nanoparticles .............................................................................. 304

[ABS-241] Structural Properties of Bismuth Ferrite Synthesized by Sol-gel Method with Variation of Calcination Temperature ........................................................ 305

[ABS-242] The experimental investigation on the crystalline structure, lattice vibration, and optical energy of La1-xBixFeO3 nanoparticles ........................... 306

[ABS-244] Magnesium substitution on site-B of Lanthanum Orthoferrite nanoparticles: structural and optical properties .................................................. 307

[ABS-245] Study of the lattice structure and optical band gap energy of La1-xMgxFeO3 nanoparticles prepared by sol-gel method ....................................... 308

[ABS-255] Investigation on the lattice structure and optical energy of La0.8Sr0.2Fe1-xMgxO3 (x=0.1, 0.2, and 0.3) nanoparticles ............................. 309

[ABS-301] Thermoelectric Performances of Ge0.99-xNa0.01AgxSe ............... 310

[ABS-193] A FORMULA FOR ESTIMATING OCEAN WAVE POWER ..... 311

[ABS-195] Preliminary Assessment of Tidal Stream Power Using 3-Dimensional Hydrodynamic Model in the Lembeh Strait ....................................................... 312


24

Keynote Speakers

Computational Mathematics between Dynamics, Geometry and Algebra

Hans Munthe-Kaas

University of Bergen, Norway

Abstract

Simulation of dynamical systems evolving in time is a central subject of numerical analysis. Traditionally, the main goals in designing a numerical integrator were high accuracy, numerical stability and computational efficiency. In the last decades it has, however, become increasingly clear that not all errors are equally bad. For example in the simulation of a conservative mechanical system it may be crucial to preserve the Hamiltonian structure of the equations, or to preserve conserved quantities such as energy, angular momenta and other first integrals. In robotics and control, there may be geometric constraints which are important to obey exactly. The lesson learnt is that the most important goal should be to ‘make errors in the right way’, rather than just minimising the error over a single time step. For long time simulations, the quality of the error is more important than its magnitude in each step. This gave birth to the research field Geometric Numerical Integration, or structure preserving discretisation of differential equations.

The analysis of geometric integration algorithms has evolved into a rich area of research in the borderland between computational dynamics, differential geometry and combinatorial algebra, where the interplay between these three fields is enriching all of them.

In this talk we will survey recent results in these areas, and illustrate by computational examples. The talk is aimed at scientists with a general background in computational engineering problems.


25

Keynote Speakers

General photovoltaic principles and operation or organic and perovskite solar cells

Juan Bisquert

Institute of Advanced Materials, Universitat Jaume I, Castelló, Spain

Abstract

The conceptual picture of a solar cell has evolved in the last two decades, when a broad landscape of candidate materials and devices were discovered and systematically studied and reported. New concepts and a rather powerful picture that embraces very different types of devices have been established resulting from many discussions and sometimes also conceptual clashes. In this lecture we provide an explanation of the operation of photovoltaic devices taking a broad perspective that embraces concepts from nanostructured and highly disordered materials to highly efficient devices such as the lead halide perovskite solar cells. We establish a simple but very rich model of a solar cell, in order to develop and understand step by step the photovoltaic operation according to fundamental physical properties and constraints. It emphasizes the aspects pertaining to the functioning of a solar cell and the determination of limiting efficiencies of energy conversion, accounting for the operation of hybrid and organic devices, as the organic solar cells, dye-sensitized solar cells, and perovskite solar cells.

References [1] J. Bisquert. Nanostructured Energy Devices – Equilibrium Concepts and Kinetics. CRC Press (2014).

[2] J. Bisquert. Nanostructured Energy Devices – Foundations of Carrier Transport, CRC Press (2017)

[3] J. Bisquert. The Physics of Solar Cells – Perovskites, Organics, and Fundamentals of Photovoltaics. CRC Press (2017)


26

Plenary speakers

Terahertz wave manipulation with metasurfaces

Ilya Shadrivov

Nonlinear Physics Centre, Research School of Physics and Engineering,

The Australian National University

Abstract

We employ micro-structured composite materials, known as metasurfaces in order to control terahertz waves. This part of electromagnetic spectrum can particularly benefit from the use of metasurfaces because of the difficulty of controlling the terahertz waves by conventional methods used either in microwaves or in optics. We discuss that the dielectric metasurfaces may represent the optimal solution for manipulating terahertz waves due to availability of high index dielectrics and relative ease of their fabrication. As one of the examples, we show that low-loss dielectric metasurfaces can be designed to efficiently absorb electromagnetic radiation in a narrow frequency range. For a simple structure made of an array of dielectric cylinders we show that in a resonant band we achieve absorption of 99.5%. Remarkably, such an absorber has subwavelength thickness and does not require a ground plane. Next, we show that it is possible to manipulate the phase of the electromagnetic waves by employing Huygen’s principle and available materials in the Terahertz frequency range.


27

Plenary speakers

Josephson junctions, localised mode, and resonances

Hadi Susanto

Department of Mathematical Sciences, University of Essex

Abstract

A Josephson junction is a quantum mechanical device, made of two superconducting electrodes separated by a barrier. Mathematically it is modelled by a sine-Gordon equation. Josephson junctions have found wide usage, such as sensitive magnetometers, single electron transistors, and quantum computers. Recent technological advances allow the introduction of shifts in the Josephson phase, which are modelled by spatial inhomogeneities in the sine-Gordon equation. Such non-uniformities will create localised modes, i.e., discrete spectrum of the linearised operator of the sine-Gordon equation. The talk will review the history of Josephson junctions, phase-shifts, as well as our latest contributions to the subject, including resonances of the localised modes that may be exploited for THz radiation sources.


28

Plenary speakers

Mathematical Modelling of Cardiac Shape and Motion: From Patient to Population

Avan Suinesiaputra

Department of Anatomy and Medical Imaging, Faculty of Medical and Health Sciences, University of Auckland, New Zealand

Abstract

Cardiovascular disease remains the leading cause of morbidity and mortality globally. A large body of research has been performed to identify symptoms, to discover new risk factors and to follow-up the progression of heart disease. Mathematics has played an important role to help understanding the mechanics, function, motion and shape of the heart. The complexity of cardiac modelling increases as the heart constantly adapts its geometry and function in the onset of injury, disease, physical exercises and ageing, in order to maintain normal physiology. To understand this adaptation, a patient-specific heart model needs to be translated into a model that can capture variations within and between different pathological groups. The combination of mathematics, statistics, bioengineering, medicine and informatics is therefore required to unravel this complex natural behaviour of the human heart either for a patient-specific or a population-based model.


29

Plenary speakers

Surveying the Universe

Matthew Colless

Research School of Astronomy & Astrophysics The Australian National University

Abstract

By measuring the locations and motions of galaxies over large volumes of the universe we can place precise constraints on the cosmological model, explore the nature of dark matter and dark energy, and test the theory of gravity. I will review the historical development, current status and future opportunities of this field, with particular focus on resolving the apparent discrepancy between low-redshift and high-redshift measurements of the expansion rate of the universe.

Keywords: astronomy, cosmology, galaxies, observatory


30

Plenary speakers

General Perspective on the Formation of Continuous Lamellar Morphology in Mesoporous Materials

Veinardi Suendo 1,2,3*, Erna Febriyanti 1,2, Didi P. Benu 1,2, Fry V. Steky 1,2, Vetty Megantari 1,2, Rino R. Mukti 1,2,3

1 Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha No. 10, Bandung 40132, Indonesia

2 Department of Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha No. 10, Bandung 40132, Indonesia

3 Research Center for Nanosciences and Nanotechnology, Jalan Ganesha No. 10, Bandung 40132, Indonesia

* Email: vsuendo[at]chem.itb.ac.id, Veinardi.Suendo[at]polytechnique.edu

Abstract

Mesoporous materials are an emerging topic in the broad community due to their morphology and pore structure. This topic becomes more interesting due to vast variety of properties that can readily be tailored, such as catalytic, adsorption, electrical, optical and magnetic properties. Recently, the number of reports on mesoporous materials increases significantly that centers on the morphological development of silica based materials. The synthesis routes to control the properties of nanostructured silica have shown significant development since the discovery of the-state-of-the-art, the Stober silica. This followed by the development of ordered mesoporous silica materials, MCM-41, and then by the discovery of recently reported bicontinous concentric lamellar (bcl) silica. The peculiar three-dimensional mesopore morphology of bcl silica has attracted much attention. The bcl silica morphology is proven to be exclusive from other conventional mesoporous silica materials such as MCM-41, SBA-15, or dendritic Mesoporous Silica Nanoparticles (MSNs). Here, the continuous lamellar morphology is the center of attraction that represents a new class of nanostructured or mesoporous materials. This new class of materials covers not only silica, but also broad types of oxide materials, such as titania and alumina. Their hallmark is the presence of continuous lamellar structures that incorporated into the open channel walls of oxide materials. We discuss the recent advances on the formation of continuous lamellar materials emphasizing phase segregation and morphological/topological transformation that investigated by both spectroscopic and thermodynamic studies.

Keywords: bicontinous concentric lamellar, continuous lamellar, mesoporous materials, open channel structure


31

Invited speakers

Mini-Symposia: Building Indonesian Observatories Network

Assalaam Observatory, Bringing Astronomy to The Santri

AR Sugeng Riadi

Assalaam Observatory, Islamic Modern Boarding School Assalaam, Sukoharjo Central Java Indonesia.

pakarfisika[at]gmail.com

Abstract

Assalaam Observatory is astronomical laboratory at an Islamic Modern Boarding School Assalaam, Pabelan Kartasura Sukoharjo Central Java Indonesia. Assalaam Observatory was the headquarters for the activities of CASA (Club Astronomi Santri Assalaam).

CASA was established to ancourage the moslem society efforts in astromomical science related to moslem worship, e.i determining qibla direction, hijriyah calendar, prayer timetable, and eclipses.

The networking of CASA links to other communities, e.i Bosscha Observatory, Langit Selatan, Jogja Astro Club, ImahNoong, HAAJ, OIF UMSU, LAPAN, ICOP, MCW, ect.

Keywords: Observatory, School, Assalaam, CASA


32

Invited speakers


Activities, Roles, and Contributions in North Sumatera

Arwin Juli Rakhmadi a) b)

a) Faculty of islamic religion University of muhammadiyah north sumatera, Muchtar Basri street no.3. Glugur Darat II, east Medan. Medan city, north sumatera 20238

b) Falak science observatory University of muhammadiyah north sumatera

Abstract

OIF UMSU is an institution under umsu which ranged in islamic astronomy field (falak science). OIF UMSU activity and routinity are receiving public visiting (especialy from schools) and general society to introduce the universe, astronomycal instruments and basic Islamic astronomy. Oif umsu also commiting research concerned with prayer as dawn and syafak research, sun shadows, Islamic calendar, etc. OIF UMSU motto is "universe photograph for faith and civilization". Universe photograph means reciting and observing sky objects which integrated in observatory. For faith means reciting sky objects as a way to strengthen faith to Allah Swt, and for civilitation means that observatory and every completion are science development apreciation with Islamic movement spirit.

Keywords: OIF UMSU, Islamic Astronomy, Observatory


33

Invited speakers


IMAHNOONG: An Observatory Model for Sharing Knowledge and Community Development Based on Astronomy

Hendro Setyanto, Fahri A. Wijaya, Azifah Anamillah

IMAHNOONG Kamp. Eduwisata Areng - Wangunsari

Lembang - Indonesia

Abstract

Celestial body such as moon, planets and stars, have attract human interest. Imahnoong as an Observatory built in 2014 at Wangunsari Village has attracted public interest to observe Celestial bodies and astronomical phenomena. Imahnoong also has attracted some schools, universities and other astronomical communities for making collaboration to develop astronomical education in their places. This Opportunities are used for Empowering People around through some activities at Imahnoong. This paper will describe some activities at Imahnoong related with Sharing Knowledge about astronomy and Empowerment People around Imahnoong.

Keywords: Indonesia Observatory, imahnoong, community development


34

Invited speakers


The Challenges and Opportunities for Astronomy Research at UAD Observatory

Yudhiakto Pramudya

Universitas Ahmad Dahlan

Abstract

The observatory plays important role on astronomy research as well as education. It also serves as facility to observe the religious related astronomical phenomenon. The new campus of UAD is prepared with the 5 meter diameter dome that was built on the top level of 10 storey building. Besides the dome, the observatory consist of control room, the display room, the outdoor observation deck, the astronomy park and the amphitarium. The amphitarium is designed to be amphitheatre shaped planetarium. There are 2 channel from the top of the building to the 1st floor of the building. They are used as the media for observing the transit of the sun at zenith. The light pollution is monitored by sky quality meter. There were active discussion with the contractor about the lighting shield that is recommended to be used to preserve the dark sky condition at the observatory. The fast growing of campus construction produce the rapid changing of the night sky condition. However, by communicating the important of the dark sky condition to the campus community, the solution can be found. Since the university has diverse department, there are number of collaboration projects to develop the observatory. The Internet of Thing to control the instruments and the astronomy learning module for observatory visitor are the example of the projects.

Keywords: Observatory, SQM, light pollution, collaborative research


35

Invited speakers

Mini-Symposia: Coastal and Ocean Dynamics

On collocated and staggered finite volume methods for the shallow water equations

Sudi Mungkasi

Department of Mathematics, Faculty of Science and Technology, Sanata Dharma University, Yogyakarta, Indonesia

Abstract

The shallow water equations have been widely accepted as a mathematical model for free-surface shallow water waves. Their solutions admit both continuity and discontinuity. In general, finite volume numerical methods are suitable for solving these equations, as these methods conserve the mass and momentum. Based on the positions of grids (cells) assigned to the unknown variables, the finite volume methods are categorised as collocated and staggered methods. If all unknown variables are assigned to each cell, then the method is called a collocated method. If one unknown variable is assigned to a cell, and another unknown variable is assigned to the next cell, and so on in a staggered way, then the method is called a staggered method.

In this talk, I will explain the general construction of the collocated and staggered finite volume methods for solving the shallow water equations. Properties of these two methods will be presented. Performance comparison will be given. Finally, strengths and weaknesses of the two methods will be summarised.

Keywords: collocated grids, finite volume method, shallow water equations, staggered grids


36

Invited speakers

Mini-Symposia: Nonlinear Phenomena

Bifurcations Analysis on a Mathematical Model of Metastatic Nasopharyngeal Carcinoma

Fajar Adi-Kusumo, Ario Wiraya

Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, INDONESIA

Abstract

We consider a mathematical model of Metastatic Nasopharyngeal Carcinoma (NPC) that involves the interaction between ATM, p53, MDM2, and DSB proteins. The model is a four dimensional system of ODE with 16 dimensional of the parameter space. There are some important parameters in our system related to the ability of the NPC for metastasis, i.e., the rate of the ATM natural degradation, the rate of p53 ubiquitination by MDM2, the maximum rate of ATM dephosphorylation by Wip1, the rate of the DSB induction by EBNA1, the maximum rate of p53 dephosphorylation by Wip1, and the maximum rate of MDM2 phosphorylation by phosphorylated Akt. In this paper, we employ the bifurcation theory to study the role of those parameters and we found that there are some interesting bifurcations in our system, i.e., zero Hopf, homoclinic, torus, and cusp bifurcations. Those bifurcations create some strange attractors and a catastrophic phenomenon in our system.

Keywords: NPC, metastasis, bifurcation, strange attractor


37

Invited speakers

Mini-Symposia: Optics, Photonics and Their Aplication

Emission Control of Quantum Emitters Based on Novel Active Materials

M. D. Birowosuto

CINTRA UMI CNRS/NTU/THALES 3288, Research Techno Plaza, 50 Nanyang Drive, Border X Block, Level 6, Singapore 637553

Abstract

Quantum emitters are critical components for many future quantum information technologies. Novel active material systems have been developed and transitioned into engineering efforts at nanoscale. Here, we review recent progress of diverse quantum emitters and their optical properties in CINTRA Singapore, including fluorescent point defect in bulk and single nanocrystal, two-dimensional materials, self-assembled and colloidal quantum dots. Remarkable progress has also been made in controlling spontaneous emission by utilizing the local density of optical states in photonic nanostructures. We focus on the enhanced light-matter interaction between the emitter and cavity, enabling the realization of efficient and fast single photon sources.

The study on the photonic nanostructures and the novel active materials is interesting to reduce power consumption of a variety of active photonic devices, including fast modulated operation single photon sources for optical communications. For fundamental research, our works will be useful in the advent of the research of the light matter interaction between the emitter and the cavity.

Keywords: Quantum emitters, nanophotonics, local density of states


38

Invited speakers

Mini-Symposia: Optics, Photonics and Their Aplication

On the Existence of Cubic-Quintic Solitons in Chalcogenide Materials based One Dimensional Photonic Crystal

Husin Alatas

Theoretical Physics Division, Department of Physics, Bogor Agricultural University

Abstract

This talk discusses our recent results on the existence of cubic-quintic solitons in a one dimensional photonic crystal that consists of two or more alternating chalcogenide based materials. It is well known that a chalcogenide based materials admit large nonlinearity with significant fifth order nonlinear effect. We have developed a couple mode equations (CME) that describe the propagation of backward and forward electric field in the system by taking into account the modulated third order nonlinearity and averaged fifth order nonlinearity. Based on dynamical system analysis we found that the CME admits the existence of new types of in-gap solitons as well as out-gap solitons. To find the profiles of the related solitons we solved the associated CME analytically and numerically.

Keywords: solitons; chalcogenide; one dimensional photonic crystal


39

Invited speakers

Mini-Symposia: Science and Technology of Solar Energy Conversion

Impedance and capacitance spectroscopies applied to photovoltaic systems

Juan Bisquert

Institute of Advanced Materials, Universitat Jaume I, Castelló, Spain

Abstract

Small perturbation methods based on frequency modulated techniques are able to provide significant information of the microscopic and macroscopic characteristics of operation of emerging photovoltaic systems. We provide the basics of impedance spectroscopy and related methods, and how they are used to interrogate systems and interfaces. The development of organic-inorganic lead halide perovskites with very large efficiency requires us to understand the operation of the solar cell. This class of semiconductors presents remarkable bulk electronic and optical properties, but the contacts to the device are a key aspect of the operation and show important dynamic interactions. We describe the results of analysis of kinetic phenomena using frequency modulated techniques. With impedance spectroscopy we provide an interpretation of capacitances as a function of frequency both in dark and under light, and we discuss the meaning of resistances and how they are primarily related to the operation of contacts in many cases. The capacitance reveals a very large charge accumulation at the electron contact, which has a great impact in the cell measurements, both in photovoltage decays, recombination, and hysteresis.


40

Invited speakers

Mini-Symposia: Science and Technology of Solar Energy Conversion

What nanoscale back-contact can do for perovskite-silicon tandem solar cells?

Gede W.P. Adhyaksa

Center for Nanophotonics, AMOLF, Netherlands

Abstract

Tandem solar cells, combining absorber layers with two distinct band gap energies into a single device, provide a practical solution to reduce thermalization losses in solar energy conversion. Traditionally, tandem devices have been assembled using two-terminal (2-T) or four-terminal (4-T) configurations; the 2-T limits the tandem performance due to the series connection requiring current matching, while standard 4-T configuration requires at least three transparent electrical contacts, which reduce the total collected power because of unavoidable parasitic absorption. Here a concept of nanoscale back-contact is introduced for a thin-film top cell in a three terminal (3-T) configuration, and show what the design can do to overcome the limitations of the existing tandem designs (2-T and 4-T). Furthermore, I will discuss how this concept can raise beyond the standard Shockley-Queisser limit (>30%) through light and carrier management.


41

Invited speakers

Mini-Symposia: Various Aspects in Combinatorics

Design theory from the viewpoint of algebraic combinatorics

Eiichi Bannai

Kyushu University

Abstract

The purpose of "design theory" is to find good small subsets which approximate the given whole space. The spaces may be good finite spaces (such as association schemes) or good topological spaces (such as spheres).

This talk gives an overview on the study of design theory from the viewpoint of algebraic combinatorics. We start with the survey of various kinds of designs, such as combinatorial t-designs ($t-(v,k,\lambda)$-designs) and more generally designs in association schemes, as well as spherical designs and their generalizations.

Our emphasis will be on the study of Fisher type lower bounds for various designs and the existence and the classification problems of tight designs (namely those satisfying the Fisher type lower bound). Some parts of this talk are based on the following paper as well as more recent progress on this topic: Eiichi Bannai, Etsuko Bannai, Hajime Tanaka, Yan Zhu, "Design theory from the viewpoint of algebraic combinatorics", Graphs and Combinatorics, 33 (2017), 1-41.


42

Invited speakers

Mini-Symposia: Various Aspects in Combinatorics

A survey on tight Euclidean t-designs

Etsuko Bannai

retired from Kyushu University

Abstract

The concept of Euclidean t-design was introduced by Neumaier-Seidel (1988) as a two-step generalization of spherical designs by Delsarte-Goethals-Seidel (1977). Namely, it is a weighted finite subset on several concentric spheres. If it is on a sphere and weight is constant, then it is a spherical design.Essentially the same concept was also studied in numerical analysis in the context of rotationally invariant cubature formulas. Fisher type lower bounds for Euclidean t-designs on p concentric spheres were studied by M\"{o}ller (1978) and also by Neumaier-Seidel (1988).

In this talk we explain the current status on the classification problem of tight Euclidean t-designs on two concentric spheres, following the paper: Eiichi Bannai and Etsuko Bannai, Tight t-designs on two concentric spheres, Moscow J. of Combinatorics and Number Theory, 4 (2014), 52-77.


43

Topic: MS Building Indonesian Observatories Network

[ABS-139] ITERA Astronomical Observatory: Feasibility study in Mt. Betung,

Lampung, Sumatera and critical assessment as center of education and research for the future

R. Muztaba(1), H. L. Malasan(1), A. N. I. Putri(1), N. Pratiwi(1), W. S. Putro(1), W. Birastri(1), L. K. Agustina(2), dan E. I. Fattah(3)

1)Atmospheric and Planetary Sciences Study Program & ITERA Astronomical Observatory, Institut Teknologi Sumatera, Jalan Terusan Ryacudu, Desa Way Hui, Kecamatan Jati Agung,

Kabupaten Lampung Selatan, Lampung 35365. 2)Geomatics Study Program, Institut Teknologi Sumatera, Jalan Terusan Ryacudu, Desa Way Hui,

Kecamatan Jati Agung, Kabupaten Lampung Selatan, Lampung 35365. 3)Geophysical Engineering Study Program, Institut Teknologi Sumatera, Jalan Terusan Ryacudu,

Desa Way Hui, Kecamatan Jati Agung, Kabupaten Lampung Selatan, Lampung 35365.

Abstract

In the year 2016 Institut Teknologi Sumatera (ITERA), Institut Teknologi Bandung (ITB), and Provincial Government of Lampung formed a consortium to initiate construction of a new observatory. Based on topographic and astronomical site surveys, the best position to construct a new astronomical observatory has been obtained. The astronomical observatory in Lampung, Sumatera have broader mission than research, that is. also as an education center for a wider audience. For research activities, based on astronomical site survey, we obtain less than 200 sunny days from May to October during which the period July-September has the lowest rainfall. The average rainfall, based on monthly observational data, occurrs in <100 mm. Furthermore, the seeing size was obtained to be around 1.50 arcsec from Albireo A star’ trail observation. We also conducted topography survey in this area with flat and hill slope between <20% and >55%, respectively. This observatory occupies area of 30 Ha and integrated within a wider area (250 Ha) including Butterfly Park, Deer Sanctuary, and local Sumatera botanical garden. In order to develop education center and to conduct various researches, this observatory will be furnished the modern instrument attached to 2-m class telescope, and new devices in the future. The Observatory named as ITERA Astronomical Observatory (IAO).

Keywords: Observatory, Astronomical Survey, Topography Survey, Geolocical Survey


44


[ABS-155] Introduction of e-Maya Observatory

Ari Wibowo

Observatorium e-maya

Abstract

The e-Maya Observatory (1070 47 39 E and 60 24 15 S) is one of the observatories in Indonesia located in Subang, West Java. The location of the e-Maya Observatory is relatively easy to access from Jakarta and Bandung, so e-Maya Observatory can be an option to enrich astronomical knowledge in addition to the Bosscha Observatory and the Jakarta Planetarium. The e-Maya Observatory is a private observatory that is still in the development stage, so its management requires hard work so that the observatory can function as it should. The e-Maya Observatory was established in 2013 which initially aimed to provide servants for the executors of Rukyatul Hilal. This goal is in line with the ideals of the e-Maya Observatory coaches to participate in the development of the Indonesian nation and establish harmony between the people of Indonesia. The e-Maya Observatory Trustee believes that by providing a location for rukyat hilal, the e-Maya Observatory can provide services to the nation and Muslims. The e-Maya Observatory also conducted photometric research using a telescope instrument connected to a ZWO 120MM and DSLR camera. In addition, in the field of education, the activities are giving astronomy teaching and training for students and teachers who are members of the MGMP IPA dan Fisika, hisab and rukayatul hilal training for Islamic organizations or foundations in collaboration with the Ministry of Religion of Subang and West Java Province, and services Qibla direction measurement.

Keywords: e-Maya Observatory, rukyatul hilal, hisab, photometry


45


[ABS-200] The Development of Islamic Astronomy Observatory in UINSA

Surabaya

Novi Sopwan, Siti Tatmainul Qulub, Agus Solikin, A. Mufti Khazin, Abu Dzarrin al-Hamidy

Program Studi Ilmu Falak Fakultas Syariah dan Hukum UIN Sunan Ampel Surabaya

Abstract

Faculty of Sharia and Law, State Islamic University Sunan Ampel (UINSA) Surabaya already has an Islamic Astronomy laboratory (Falak laboratory). It is equipped with several instruments such as telescopes, binoculars, theodolites, cameras, etc. Nowadays the Falak laboratory only be used in student lectures and practice activities. It will be developed as the Astronomical Observatory of UINSA (Observatorium Ilmu Falak UINSA, OIF-UINSA) to expand the services for the public, so that OIF-UINSA becomes the research and development center of Islamic astronomy in Indonesia, especially in East Java.

Keywords: Observatory, Islamic Astronomy


46


[ABS-220] Walisongo Planetarium As strengthener of Falak Scientific Distinction

of UIN Walisongo

Ahmad Izzuddin (a*), Ahmad Adib Rofiuddin (a)

a) Ilmu Falak majors, Faculty of Syariah and Law, Walisongo State Islamic University Jalan Prof. Dr. Hamka Kampus III, Ngaliyan, Semarang

*[email protected]

Abstract

The transformation of IAIN Walisongo to UIN Walisongo in 2015 implied to the application of the unity of Sciences paradigm, as stated in the vision promoted by UIN Walisongo. Unity of Sciences paradigm means that all knowledge in the world leads to al-Alim, Allah SWT. To strengthen the application of this philosophy, UIN Walisongo made Ilmu Falak majors as a scientific distinction among Islamic State Universities in Indonesia. The appointment of Ilmu Falak majors as a scientific distinction is supported by several facilities that have been, are being, and will be built to make Ilmu Falak majors as a leader in the development of Islamic astronomy in Indonesia. One of the facilities that will be built to support this is the Walisongo Planetarium. Walisongo Planetarium is a development of laboratory facilities with a wider scope not limited to lecture practicum, but also used as a place of training, research and other supporting activities. This paper will discuss the Walisongo Observatory involving the history, future development activities and projects

Keywords: walisongo planetarium, the Unity of Sciences paradigm, development projects


47


[ABS-247] Construction of space observation facilities in Nusa Tenggara Timur

Clara Y. Yatini and E.Sungging Mumpuni

Space Science Center, LAPAN

Abstract

The new observatory in Timau Nusa Tenggara Timur is being developed to answer the needs of astronomical observation facility in Indonesia. The Timau National Observatory will have a main optical telescope with a diameter of 3.8 meters using the modern technology from Japan. This telescope uses segmented mirrors and lightweight. Besides this main telescope, other observation equipments are being prepared, two 50 cm-diameter telescopes, 30 cm-diameter solar telescope, and other devices to observe the space. The observatory is expected to have a role in the research and development of various disciplines. In the framework of the development of the observatory in Timau, the National Observatory Headquarters and the Science Center are built in Kupang. The Science Center has a building called Open Science Center, which serves public in understanding the science in enjoyable way.

Keywords: observatory, telescope, optical, public outreach


48

Topic: MS Coastal and Ocean Dynamics

[ABS-264] Seiches in a Closed Basin of Various Geometric Shape

H. Q. Rif’atin, I. K. Magdalena

Institut Teknologi Bandung

Abstract

Seiches are long-period standing oscillations in an closed basin or in a locally isolated part of a basin. These oscillations occur at the natural resonant period of the basin which are determined by the basins geometry and depth. When the period of the wave caused by external forces matches with the natural resonant period of the basin, further resonance occurs. In this paper, we will observe wave profile in a closed basin of various geometric shape, which are rectangular, triangular, and semi-parabolic. The governing equation is shallow water equation. The analytical solution is calculated to get the value of a natural resonant period of the basin, which causes resonance phenomenon. The equation will be solved numerically using finite volume method on a staggered grid to confirm the analytical solution. The numerical results show the occurance of resonance phenomenon using the analytical natural resonance period we got.

Keywords: natural resonant period, resonance, shallow water equation


49


[ABS-23] SPH simulation of surge waves generated by aerial and submarine

landslides

Iryanto(a*), S.R. Pudjaprasetya(b)

a) Informatics Department, Politeknik Negeri Indramayu, Indonesia *[email protected]

b) Industrial & Financial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia

Abstract

Since the Indian Ocean Tsunami in 2004, there has been extensive research on tsunami modelling. Fundamental mechanism of tsunami generation is by earthquake fault plane or mass landslide. This article is focused on surge waves induced by mass landslides. Restricting to two dimensional study, mass landslides over a sloping beach, is simulated by using the Smoothed Particle Hydrodynamics (SPH) method. The SPH method is a Lagrangian meshless method, commonly used to describe complex events. Here, the landslide is modeled as a solid triangle block sliding down along a sloping bottom. The SPH method is used to simulate surge waves induced by two types of landslides; aerial and submarine. Our results were validated using the experimental data of Heinrich. It was shown that the resulting waves induced by aerial and submarine landslides agree well with the experimental data.

Keywords: aerial landslide, submarine landslide, smoothed particle hydrodynamics, waves generated by landslide


50


[ABS-280] Measurement of Suspended Sediment Concentration in Seribu Island

using Acoustic Doppler Current Profiler

Henry M. Manik*), Totok Hestirianoto*), Angga Dwinovantyo**), Randi Firdaus**), Dony Apdillah *)

*)Department of Marine Science and Technology, Bogor Agricultural University Kampus IPB Dramaga Bogor

**) Graduate Student, Marine Technology Study Program, Bogor Agricultural University Kampus IPB Dramaga Bogor

***) Universitas Maritim Raja Ali Haji (UMRAH), Tanjung Pinang Kepulauan Riau

Abstract

Measurement of suspended sediment concentration is one of the ocean properties needed to understand the characteristics of sediment transport. However, until now measurements method for estimating of this phenomena are often problematic when employing using water samples collection or optical method. Acoustic instrument, such as Acoustic Doppler Current Profilers (ADCP) were used for quantifying suspended sediment concentrations from acoustic backscatter intensity. Profiles of suspended sediment concentrations are estimated from acoustic backscatter intensity measured by 307.2 kHz acoustic Doppler current profilers located at Tidung Islands waters, Indonesia. Acoustic transmission losses quantified due to spherical spreading and water absorption. The success of this approach using commercially available Doppler profilers provides promise that this technique was useful for measuring suspended sediment concentration.

Keywords: suspended sediment, acoustic, doppler, sonar equation


51


[ABS-303] The Optimal Shape of Sinusoidal Shaped Submerged Breakwater in

Reducing Wave Amplitudes

Muh Fadhel Atras, Ikha Magdalena

Bandung Institute Of Technology

Abstract

In this paper, we investigate wave damping mechanism by absolute sinusoidal-shaped submerged breakwater using a mathematical model. The governing equation that we use is Linear Shallow Water Equations (SWE). We solve the equations using separation variable method to obtain the analytic solution of wave elevation over the breakwater with specific maximum height h_m and length 0 ≤ x ≤ L on three main domains, x < 0, 0 < x < L, and L < x. In the 0 < x < L domian, we solve it by focus on one mound breakwater which then the solution is can be generalized for n mound of breakwater. From the analytic solution, we could derive the wave reflection and transmission coefficient analytically. Then, we construct a numerical code for linear SWE based on the finite volume on a staggered grid to simulate the propagation of monochromic wave pass over the breakwater. The optimal form of Breakwater can be seen from the value of the transmission coefficient (Kt), which is the ratio between the transmission wave amplitude and the incoming wave. The smaller value of Kt means the reduced wave amplitude is greater. Therefore, the optimal breakwater shape is the shape which gives the smallest Kt value according to the characteristic of the incoming wave. For validation, we compare the numerical Kt result with the Kt from the analytic result. The result of this paper may be useful to the engineering of wave reflector to secure beachside building.

Keywords: Submerged breakwater · Shallow Water Equation · Transmission Coefficient · Optimal size


52


[ABS-70] Fishery productivity in the Suitable Location for FADs Placement with

Landsat 8 Imagery

Cinthia (a*), Tuty Handayani(a) , Jarot Mulyo Semedi (a)

a) Geography Department, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, West Java 16424

*[email protected]

Abstract

Fishermen with fishing ground in the Pacitan Bay have low productivity, so more fishermen choose to sail to the open sea. However, open sea fishery activities are expensive. To reduce operational costs, some fishermen use FADs. The use of FADs and the placement of FADs in the appropriate waters area, will increase the production of capture fisheries. This study aims to know the improvement of fishery productivity in the appropriate location for the placement of FADs. The data collection methods are interpretation of Landsat 8 imagery, water quality sample testing of the sea water and interview with the fishermen. The data analysis was done using spatial approach with GIS technology. The parameters used to determine the suitability of FADs locations are temperature, velocity of currents, turbidity, salinity, depth, pH and density of chlorophyll-a distribution. The results show that the production of capture fisheries with FADs can be increased in the suitable location of water quality parameters. In the suitable location the average production of more than 2 tons and less suitable location of about a ton. The traditional fishermen production is about 300 kg in the suitable location for FADs and in not suitable location for FADs is about 200 kg.

Keywords: Landsat 8 Imagery, Fishery Productivity, Fish Aggregating Devises (FADs), Suitability Area Analysis, Geographic Information System


53


[ABS-74] Two-layer non-hydrostatic scheme for simulations of wave runup

M. A. Ginting (a*), S. R. Pudjaprasetya (a), D. Adytia (b)

a) Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia *[email protected]

b) Telkom University, Jalan Telekomunikasi 01, Terusan Buah Batu, Bandung 40257, Indonesia

Abstract

A non-hydrostatic model is implemented to simulate a wave runup. This model is approximated by resolving the fluid depth into two-layer with equal depths. The equations are then solved by applying the staggered grid scheme. The first benchmark test was simulating a periodic wave runup of Carrier and Greenspan. Good agreement between numerical result and the analytical formula are obtained for both; surface profile as well as the moving shoreline. Further, runup simulation were conducted for solitary waves climbing up a sloping beach, following the experimental set up by Synolakis. Two simulations with solitary waves of small and large amplitudes were conducted. Again good agreement were obtained, especially for the prediction of run up height.

Keywords: non-hydrostatic model, wave runup, embedded influxing


54


[ABS-330] UNDERWATER OBJECT DETECTION USING SCIENTIFIC

ECHOSOUNDER

Henry M. Manik*), Susilohadi**), Dony Apdillah***)

*) Department of Marine Science and Technology, Faculty of Fisheries and Marine Sciences Bogor Agricultural University

**) Marine Geological Institute, ESDM ***) Universitas Maritim Raja Ali Haji (UMRAH), Tanjung Pinang

Abstract

The development of fisheries acoustic technology for measuring fish began in the twentieth century. The two world wars and the cold war produced three eras of rapid technological development in the field of fisheries acoustics. Researchers had detected echoes from fish in the traces from their echo sounders. The application of scientific echosounder as a tools of locating schools of fish was developed. Echosounder technology employing high frequencies, narrowband, single beam, and multiple frequencies were developed as methods for the detection, quantification and identification of fish and seagrass. The results of scientific echosonder has developed using acoustic techniques to detect and quantify in real time. Advancements in computer technology have been important to detect and quantify underwater object more accurately.

Keywords: target strength, scientific echo sounder, digital transducer, fish, seagrass


55


[ABS-79] Mangrove density impacts on tidal dynamic in Segara Anakan Lagoon,

Indonesia

Ayi Tarya, Larasati C. Sunaringati and Nining Sari Ningsih

Dept. Oceanography, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Indonesia

Abstract

The present study aims to understand the tidal dynamics in a tropical coastal lagoon, Segara Anakan, Java, Indonesia. It is a shallow lagoon, with complex tidal channels and connected to the Indian Ocean by two channel outlets. It covers an overall area of about 12.000 ha. Three-quarters of the lagoon area have mangroves and the remaining quarter is covered by water. The Delft3D model has been implemented and validated using observation data. Scenario with uniform and spatially bottom drag coefficient were created in order to investigate the influence of the mangrove density on tidal dynamics. Based on tidal harmonic analysis, the M2 amplitude attenuates from both the western and the eastern lagoon inlets to the interior of the lagoon as the tidal wave is constricted by the narrow lagoon inlet and shallowness of the lagoon. For the case of uniform mangrove density, tidal harmonic analysis reveals M2 amplitude decreasing of 0.5 to 0.25 m from lagoon inlets toward central lagoon due to bottom friction effect. The tidal propagation into lagoon show increasing M2 tidal phase with maximum delay of 2.5 hours at the central lagoon. For the case of spatially mangrove density, the dampening of the tidal wave is stronger of 18% and the phase delay is longer 0.8 hours compare to the the case of uniform mangrove density.

Keywords: Mangrove density, tidal dynamics, coastal lagoon, hydrodynamic model


56


[ABS-86] Flow generating surface wave

L. H. Wiryanto, Sudi Mungkasi

FMIPA ITB, Uni Sanata Dharma, Yogyakarta

Abstract

A steady solitary-like wave can be obtained on the free surface, generated by supercritical flow that is disturbed by a bump. This type of wave is the solution of the KdV equation containing non-homogeneus term, representing the bump. The upstream Froude number plays an important role in obtaining the surface wave, i.e. only for greater than a certain number, depends on the height of the bump, but mainly for supercritical flow . To observe the free surface flow for general Froude number, here an unsteady model is derived, based on disturbing of the uniform flow. The simulation of the model can perform the steady solitary wave for both super and subcritical flows

Keywords: Solitary wave, KdV equation, Froude number


57


[ABS-91] Numerical Solution of Surface Wave Generated by A Uniform Flow

Disturbed by A Bump

Azis S. Sani (*), L. H. Wiryanto

Department of Mahtematics, Bandung Institute of Technology, Jalan Ganeca 10, Bandung 40132, Indonesia

*[email protected]

Abstract

The channels condition will affect the surface of the water flowing in it. Channels that have a bump at its bottom cause the wave generation on the water surface. The uniform flow that enters the channel will hit the bump and cause the formation of one peak and two dales on the surface. This phenomenon can be modeled by the Boussinesq equation and in the linear case, the model can be solved analytically and numerically. The Lax method is used to solve the model numerically. The simulation results show that the Lax method can confirm the analytical solution well for subcritical and supercritical flow types.

Keywords: Boussinesq equation; Lax Method; Froude Number; Supercritical Flow; Subcritical Flow


58


[ABS-115] A Numerical Study of Tidal Bores

Nining Sari Ningsih (a*), Nabiel Luthfi Siddiq (b), Ayi Tarya (a)

a) Research Group of Oceanography, Faculty of Earth Sciences and Technology, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Department of Oceanography, Faculty of Earth Sciences and Technology, Bandung Institute of

Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

A tidal bore is a natural phenomenon forming a positive surge upstream and it has a remarkable effect on estuary zones and river ecologies. The tidal bore formation controlled by channel properties, tidal characteristics, and river discharge remains a research challenge. In this study, a tidal bore formation and its hydrodynamics characteristics have been numerically investigated using a two-dimensional version of OpenFOAM (Open Source Field Operation and Manipulation) to obtain a better understanding of the effects of flow velocity before arrival of the bore, initial water depth, and Froude number (Fr) on the propagation of the tidal bore. The numerical simulation results have confirmed earlier findings obtained under both field and laboratory data in which types of the tidal bores depend on the Froude number. An undular tidal bore occurs when 1 <= Fr < 1.3, while partially breaking undular bore appears for 1.3 <= Fr <1.5 - 1.6. Further simulation results have revealed that the flow velocity before the bore passage is more dominant than the initial water depth in affecting the Froude number. Meanwhile, the bore celerity is more affected by the initial water depth compared to the flow velocity before the bore arrival. It was found that the Froude number does not directly affect wave parameters of the bore, such as amplitude, length, period, and steepness of the wave. However, the wave length and period are directly proportional to the initial water depth, whereas the wave amplitude and steepness are associated with the velocity prior to the bore passage.

Keywords: tidal bore; OpenFOAM; Froude number; undular; breaking


59


[ABS-147] Separating incident and reflected spectra in wave flumes with mangrove

F.A.R. Abdullah (a*), S.R. Pudjaprasetya (b), Semeidi Husrin (c), Huda Bachtiar (d)

a) Department of Oceanography, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung, 40132, Indonesia

*[email protected] b) Department of Mathematics, Faculty of Mathematics and Natural Sciences, Institut Teknologi

Bandung, Jalan Ganesha 10, Bandung, 40132, Indonesia c) Marine Research Center, Ministry of Marine Affairs and Fisheries, Republic of Indonesia,

Jakarta, Indonesia d) Research Center for Water Resources, Ministry of Public Work, Republic of Indonesia, Bali,

Indonesia

Abstract

Wave spectra is a quantity that can describe the distribution of wave energy at each frequency. By analyzing wave spectra of a signal, the process of energy transfer in waves across a structure can be observed. In wave flume experiments, the recorded wave signals at wave gauges along the flume is a superposition of transmitted and reflected waves. Well known method for separating reflected and transmitted spectra is the least square method of Mansard and Funke. This method uses wave signal data recorded simultaneously at three adjacent wave probes along the wave flume. In an experiment to measure the effectiveness of mangrove. Wave paddle on the left generates wave that propagates into the domain, passes mangrove barrier on the right part of the flume. Wave signal measured at the upstream part of mangrove is a superposition of transmitted and reflected waves. This method is implemented here to determine the incident and reflected spectra since in the upstream part of the wave flume. The resulting reflection and transmission coefficients indicate that most of the wave energy is dissipated by the mangrove.

Keywords: Wave spectra; incident and reflected; least square method


60


[ABS-191] Ocean Circulation in Pari Island - Jakarta, Indonesia

Corry Corvianawatie

Research Center for Oceanography, Indonesian Institute of Sciences (LIPI)

Abstract

Coastal area of Pari Island is one of the affected area by beach debris. The huge amount of beach debris is frequently found at the southwest part of Pari Island during southeast monsoon. Occasionally, beach debris were also found at the northwest part of Pari Island. It is suggested that floating marine debris were originated from several rivers at Jakarta mainland and transported to Pari Island by ocean current. However, still a few information about the ocean circulation in detailed spatial and temporal resolutions. Thus, the aim of this study is to understand the ocean circulation in Pari Island by using high resolution numerical ocean model. Tides and monsoonal winds were used as the main oceanographic forcing at this area. The interaction between tidal and wind affected ocean current variability. Absolute velocity of ocean current were in the range of 0 - 50 cm/s and the direction is varying due to the wind and tidal interactions. At the peak of southeast and northwest monsoon, the winds is dominant and cause water mass transport mainly follow the direction of the winds.

Keywords: Ocean current; monsoon; tides; circulation; Pari Island


61


[ABS-218] Model of Sediment Movement For Sea Boundary Monitoring in Torasi

River – Indonesian Water Border Based on Its Coastal Morphology Dynamics

I Wayan Sumardana Eka Putra(a), Noverita Dian Takarina(b)*, Supriatna(c),Semeidi Husrin (d)

a) Marine Science Postgraduate Program, b) Department of Biology, c) Department of Geography, Faculty of Mathematics and Natural Sciences, University of Indonesia, Depok, West Java 16424

*[email protected] b)Marine Research Centre, Ministry of Marine Affairs and Fisheries -The Republic of Indonesia

Abstract

Sediment transport analysis covers the sediment mobilization in water environment. This analysis is enable to create models, one of them based on total suspended solid transport which widely developed for estuaries region. This research was aimed to determine morphology dynamics in Torasi River as a boundary between Merauke Papua waters based on remote sensing and hydrodynamic simulations. Mostly, sediment texture found in this river were mud and sand. Budiman algorithm was used to create sediment movement based on remote sensing model. Hydrodynamic model was created using Delft 3D which verified data from field measurement like tides, currents, materials suspended on the domain model from Torasi River. Data collected were selected from several period, which were 2002, 2011 and 2016. The results showed that sediment movement in both directions and the value were relatively similar, which can be used to see sediment sedimentation process around Torasi River during those period. As UNCLOS River Mouth 1982, clearly state any changes resulting from natural processes will not alter the boundary. Furthermore the model created can be considered to be scientific method in monitoring basic points based on material (sediment movement) in regard to manage marine boundary with other countries.

Keywords: Budiman algorithm, Delft 3D, sedimen transport, Torasi River, total suspended solid


62


[ABS-246] Numerical Study on the Influence of an Incident Waveform on Tsunami

Run-up

N. Erwina* and S. R. Pudjaprasetya

Industrial and Financial Mathematics Research Group, Bandung Institute of Technology, Indonesia

*[email protected]

Abstract

Wave run-up is one of the important phenomena in the study of tsunami impact. The analytical and numerical study has been conducted to predict the run-up height. Here, numerical simulation of nonlinear wave run up on the beach is studied. We implement the staggered conservative scheme to solve the 1D shallow water equations. The advection term is approximated using momentum conservative scheme and the wet-dry procedure is applied to incorporate the moving boundary. Validation with analytical solution shows a good agreement. We use this numerical scheme to study the influence of the incident waveform on run-up height. Three type of wave is used, monochromatic waves, solitary waves and N-waves. The result shows that for the relatively small wave amplitude, the leading depression N-waves have the highest run-up height. It can be interpreted that when the sea water recedes before the tsunami, it may have an impact on a wider area.

Keywords: Run-up; Wave simulation; Staggered conservative scheme


63

Topic: MS Nonlinear Phenomena

[ABS-36] H-relative Systems Computation for System of Ordinary Difference

Equations Derived from A sine-Gordon Equation

Stephanus Ardyanto(a*); Kie Van Ivanky Saputra(b); Johan Matheus Tuwankotta(a)

(a) Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40132

*[email protected] (b) Faculty of Science and Mathematics, University Pelita Harapan, Jl. M.H. Thamrin Boulevard,

Tangerang Banten, 15811 Indonesia

Abstract

In this paper, we investigate the staircase reduction on sine-Gordon PΔE. We also introduce a new discrete-dynamical systems via duality relation on a simple discrete-dynamical system. We shall apply this duality method on the sine-Gordon equation we derived earlier.

Keywords: Discrete dynamical system; Staircase reduction; Dual; sine-Gordon equation


64


[ABS-62] Infinitely many Equilibria and Some Codimension One Bifurcation in a

Two Prey One Predator Dynamical System

Marwan, Johan Matheus Tuwankotta

Analysis and Geometry Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung, Indonesia 40132

Abstract

This paper presents a Two Prey One Predator type of dynamical system where the prey is classified into two ages classes: the young prey and the adult prey. We interested in the dynamics and bifurcations in a subsystem when the adult prey is disappeared. As we vary the mortality parameter of predator, some codimension one bifurcations, i.e. transcritical bifurcation and Hopf bifurcation are found. Furthermore, the system has a behavior named infinitely many equilibria when the parameter is zero. Numerical examples are presented by using algebra computer software.

Keywords: Two Prey One Predator dynamical system; transcritical bifurcation; Hopf bifurcation; infinitely many equilibria


65


[ABS-81] Application of Lagrange Multiplier Method for Computing Cusp Point

In A System of Ordinary Differential Equations

Livia Owen and Johan Matheus Tuwankotta

Analysis and Geometry Group, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology,

Jl. Ganesha no 10 Bandung, Indonesia

Abstract

We introduce an application for computing cusp points by using Lagrange Multiplier Method. We can analytically compute cusp bifurcation point of an equilibrium in a two-parameter family of autonomous systems in ℝ2. We give an example how to get the bifurcation diagram of unperturbed system in a three thropic food-chain model. Furthermore, we also detect a swallowtail bifurcation in previous model.

Keywords: Lagrange Multiplier Method, Cusp Bifurcation, Swallowtail Bifurcation, Dynamical System


66

Topic: MS Optics, Photonics and Their Applications

[ABS-126] Mie Scattering Modes Analysis of Rotated Finite Cylinder

Nanda Perdana, Suhandoko Dwi Isro, Alexander A Iskandar

Physics of Magnetism and Photonics Research Division, Faculty of Mathematics and Natural Sciences,

Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia

Abstract

The scattered electromagnetic field of an arbitrary structure can be expanded in the orthogonal vector spherical harmonics (VSH) functions. Since each mode of this VSH expansion is associated with the well-known electric and magnetic multipole fields distribution, it becomes possible to analyze the observed scattering pattern based on these functions. In this report, we will present the study of an electromagnetic wave scattering on a dielectric finite cylinder at oblique angle incident field. Contrary to the case of normal incident field where the TE and TM polarizations are decoupled, due to the oblique incident angle, the two polarization in the scattering field are coupled. At this oblique incident case, three phenomena are observed, namely a gradual shift and a jump in the decomposed resonance spectra, as well as the appearance of multiple resonances in the same mode. Due to these rich phenomena, special interference pattern in the scattering field can occur, specifically the zero backward-scattering and the zero forward-scattering cases.

Keywords: Mie scattering; Nanorod; Multipole decomposition


67


[ABS-138] Heating with Metal Nano Particles

Nicholaus Kevin Tanjaya, Alexander A. Iskandar

Physics of Magnetism and Photonics Research Division, Institut Teknologi Bandung

Abstract

Metal nanosphere and nanoshell are studied in this paper to determine changes in their temperature when irradiated by electromagnetic waves. Plasmon resonance cause the increased of metal absorbance which convert electromagnetic energy to thermal energy. Quasistatic approximation is used in this study for the 3 configurations considered. The first configuration is a metal (gold and silver) nanosphere, and the second configuration is a dielectric coated metal nanosphere, and the last configuration is a metal nanoshell coating of a dielectric nanosphere. All these configurations are embedded in a non-absorptive background medium. It was found that the change in temperature is highest for the gold nanoshell compared to the nanosphere configuration. In addition, the nanoshell configuration can be optimized by changing the size of silicon dioxide core or gold coating to achieve a desired plasmon resonance frequency shift.

Keywords: Plasmon Resonance, Metal Nano Particles, Heating, Quasi-static


68


[ABS-145] Spatial Dispersion and Tensorial Analysis of Second and Third

Harmonic Generation in Diamond and Zincblende Semiconductors

Hendradi Hardhienata, Muhammad Ahyat, Rudi Sagala, Aryl Alfath Iqbal, and Husin Alatas

Theoretical Physics Division, Department of Physics, Bogor Agricultural University, Jl. Meranti, Gedung Wing S, Kampus IPB Darmaga, Bogor 16680, Jawa Barat, Indonesia

Abstract

Rotational Anisotropy Spectroscopy (RAS) is attractive due to their real time monitoring under room temperature and non-vacuum condition. Nanoscale surface molecular orientation up to single atomic layers can be performed with the help of classical models based on the Ewald-Oseen extinction theorem. Although significant progress has been made to understand the nonlinear sources that are detected RAS reflection experiments for diamond and zincblende structures, a comprehensive explanation on the effect of spatial dispersion and separation of the isotropic and anisotropic part of the nonlinear susceptibility that is responsible for second harmonic and third harmonic generation in these lattice structures is still lacking. Here we show that second order nonlinear effects due to spatial dispersion in diamond structures are often similar to nonlinear surface dipole contribution but can be distinguished for certain facet orientation. Meanwhile, we show how the second and third order nonlinear susceptibility tensor in diamond and zincblende structures can be separated using group theory and bond model and that the tensor elements can be greatly reduced into few independent parameters. In addition, we apply the bond model to simulate RAS intensity in reflection for arbitrary input polarization angle ψ showing that the maximal nonlinear intensity peak due to second and third harmonic generation in (001) zincblende structure are not in phase but have a relative phase shift, Δψ= 20 degree.

Keywords: spatial dispersion, nonlinear tensor separation, rotational anisotropy spectroscopy, bond model


69


[ABS-173] Asymmetric Dielectric Nanorods for Scattering Pattern Shaping

Suhandoko D. Isro (a), Alexander A. Iskandar (a*), Yuri S. Kivshar (b) and Ilya V. Shadrivov (b)

a) Physics of Magnetism and Photonics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Nonlinear Physics Centre, Research School of Physics and Engineering, Australian National

University, ACT 2601, Australia

Abstract

Light manipulation in nanoscale systems can be controlled through the interference of Mie resonance modes. Owing to the superposition between different field distribution of these resonances it becomes possible to engineer the angular distribution of the scattered field. In the present work, we demonstrate the overlap of Mie resonance modes which can be done by drilling a hole parallel to a dielectric cylinder axis, resulting in a unidirectional scattering. We further show that the rotation of a structure with asymmetric hole can be utilized to achieve almost arbitrary scattering direction.

Keywords: asymmetric nanorods, high-index nanoparticles, Mie resonance, mode interference


70


[ABS-178] Study on the profile depth effect on the field intensity distribution of surface plasmon polariton and its spectral shape in one dimensional

periodic dielectric/metal structure

Susi Komalasari, Rahmat Hidayat

Physics of Photonics and Magnetism Research Division, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung, West Java, Indonesia

Abstract

The utilization of Surface Plasmon Resonance (SPR) phenomenon relies on the surface plasmon polariton wave generation, which exhibit strong field intensity of electromagnetic (polariton) wave. This intense electromagnetic wave has been proved to be useful for enhancing the absorption and fluorescence of any dyes or molecules on the metal surface. It has been also employed to enhance Raman scattering intensity, which is a unique technique commonly called as the Surface enhanced Raman spectroscopy (SERS). In this presentation, we report our study on the surface plasmon polariton wave excitation in a one-dimensional periodic (grating) dielectric/metal structure. For those above purposes, we should have an overlap between the SPR spectrum and either the absorption. fluorescence or Raman scattering spectrum of the dye or analyte. In addition, we should also convince that the dye or analyte is covered by the plasmon polariton wave. Therefore, we have performed an experimental work for preparing dielectric/metal gratings from polymerizable hybrid polymer by nano-imprint lithography, which then covered by a very thin Au layer. The spectral shapes of surface plasmon excitation in those structures were measured by SPR spectroscopy. The dielectric/metal grating structure with the periodicity of 700 nm of 47% duty cycle and the thickness of gold is 46 nm has been successfully fabricated. Its SPR spectral seems agree with the computation result based on Rigorous Coupled Wave Analysis (RCWA), showing a SPR dip at around 600 nm. The simulation results also show that, at a certain range, the greater grating depth produce a stronger field of polariton wave.

Keywords: plasmon-polariton, field intensity, RCWA, SERS, SPR, grating


71


[ABS-179] Fabrications of Tapered Optical Fibers by Laser Induced

Photopolymerization Technique

Susi Komalasari, Nikmatul Husna, Rahmat Hidayat

Physics of Magnetism and Photonics Research Group, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Bandung, Indonesia

Abstract

Taper shaped optical fibers have been much investigated because it may enhance the evanescence wave formation on the surface of the fiber, which can be utilized for sensing. In this paper, we report the fabrication of tapered optical fiber by employing laser induced photo-polymerization (LIP) technique from hybrid organo-siloxane polymer precursor. This precursor was prepared by the sol-gel method for creating the inorganic cross-links. The photopolymerization process then made the organic cross-links and transformed it into the solid phase. The taper structure formation was strongly dependent on the laser power and time duration. A typical condition for taper structure formation was the laser power of 2 μW and the fiber drawing speed in the range of 20 μm/s - 40 μm/s. The resulted tapers lengths were around 1.5 mm–5.5 mm with the diameter around 100 μm at the beginning of the taper and less than 5 μm at the end of the taper. The optical propagation and evanescent wave profile in this kind of tapered optical fiber was also studied computationally by using Finite Difference Time Domain (FDTD) method.

Keywords: hybrid polymer, tapered optical fiber sensor, optical waveguide, evanescent wave


72


[ABS-181] Spectral analysis of Surface Plasmon Resonance in the 0th diffraction

order of one-dimensional periodic Al nanostructure

Jalu Setiya Pradana and Rahmat Hidayat

Physics of Magnetism and Photonics Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung-Indonesia

Abstract

In order to find new materials, aluminum (Al) becomes promising materials to replace the use of gold (Au) and silver (Ag) as materials that commonly used to generate SPR wave. Al provides a higher sensitivity and relatively economical as compared to noble metal but the SPR wave on the surface of aluminum can only be excited in the near-infrared region by a prism coupler configuration. Interestingly, diffraction orders can be used to excite SPR wave in aluminum in visible spectra. In addition, the use of grating for exciting surface plasmon resonance (SPR) wave is still the most convenient method in SPR spectroscopy because it has many advantages such as higher sensitivity, less angle-incident limitation, and simple detection set-up. In this study, we observe and analyze the spectra of the zeroth order diffraction from one-dimensional periodic Al nanostructure and the corresponding SPR dips by variation of incident angle. The result shows that several SPR dips are observed. A numerical calculation using the RCWA method is used to simulate and clarify the experimental results.

Keywords: aluminum, dip, order diffraction, reflection spectra, surface plasmon resonance (SPR)


73


[ABS-227] Coulomb Explosion Phenomenon as Effect of Irradiation Time in Au-

Ag Nanoalloys Synthesized Femtosecond Laser

A N Hidayah (a,b*), D Triyono (a*), Y Herbani (b*), Isnaeni (b*) and M M Suliyanti (b*)

a) Department of Physics, Universitas Indonesia, Kampus UI Depok, Indonesia b) Research Center for Physics-Indonesian Institute of Sciences, Kawasan PUSPIPTEK Building

442, Serpong, Tangerang Selatan, Banten, Indonesia *[email protected]

Abstract

One that influences the synthesis of au-ag nanoalloys is laser irradiation time. Where in this process there is a coulomb explosion phenomenon believed to be responsible for reducing nanoparticle size. We synthesize Au-Ag Nanoalloys from gold and silver metal ion ratio that is Au0Ag100, Au10Ag90, Au20Ag80, Au30Ag70, Au40Ag60, Au50Ag50, Au60Ag40, Au70Ag30, Au80Ag20, Au90Ag10 and Au100Ag0 in water medium added with PVP concentration of 0,01% using femtosecond laser. Where all solutions are irradiated by laser in 5 and 15 minutes irradiation time and characterized by UV-Vis spectrophotometry to know effect of irradiation time on surface plasmon resonance. And only Au50Ag50 in 5 and 15 minutes irradiation time are characterized with TEM to know effect of irradiation time for reducing nanoparticle size. The result of UV-Vis spectrophotometry and TEM show that irradiation times in the synthesis of Au-Ag Nanoalloys influence the shifting of surface plasmon peaks and reducing nanoparticle size. Where Au50Ag50 in 5 minutes irradiation time has a particle size of 7,98 nm and in 15 minutes irradiation time has 5,18 nm.

Keywords: coulomb explosion; irradiation time; au-ag nanoalloys; femtosecond laser


74

Topic: MS Science and Technology of Solar Energy Conversion

[ABS-124] Electrochemical Deposition of Graphene Oxide as Buffer Material of

𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 Working Electrode in DSSC

Annisa Aprilia(1*), Fitri Yuliasari(1), Vika Marcelina(1), Fitrilawati(1), Norman Syakir(1), Yeni W. Hartati(2), Lusi Safriani(1), R. E. Siregar(1)

1). Physics Department, FMIPA, Universitas Padjadjaran Jl. Raya Jatinangor KM. 21, Jatinangor, Kabupaten Sumedang, 45363, Indonesia.

*[email protected] 2) Chemistry Departemen, FMIPA, Universitas Padjadjaran

Jl. Raya Jatinangor KM. 21, Jatinangor, Kabupaten Sumedang, 45363, Indonesia

Abstract

In this work, Graphene oxide (GO) as buffer material in 𝑇𝑇𝑇𝑇𝑂𝑂2 based photoanodes of dye sensitized solar cell (DSSC) was fabricated using electrochemical deposition. The electrochemical deposition of GO was carried out in the voltage range of -1.6 to 0 Volt in three cycles with scan rate of 50 mV/s onto ITO/ 𝑇𝑇𝑇𝑇𝑂𝑂2 mesoporous layers. The photovoltaic characteristics, morphology, and UV-Vis absorbance of each layer were investigated. According to the experimental results, the photovoltaic performance of DSSC was improved significantly with the inserting GO layer on TiO2 mesoporous as photoanode. This condition can be attributed to the higher specific surface area of GO which can inhibit charge recombination leading to produce a higher photocurrent density.

Keywords: graphene oxide, electrochemical deposition, dssc, photoanode, 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 mesoporous


75


[ABS-127] Study on the Effect of PVDF and 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 Composition on Quasi-Solid

State DSSC

Putri Nur Anggraini (a*), Natalita Maulani Nursam, Rizky Ananda Putra (b), Shobih, Lilis Retnaningsih

a) Research Center for Electronics and Telecommunication, Indonesian Institute of Science (P2ET-LIPI), Komplek LIPI Gedung 20 lantai 4, Jl Sangkuriang Cisitu, Bandung 40135, Indonesia

*[email protected] b) Department of Physics Engineering, Telkom University, Jl. Telekomunikasi No. 1, Terusan

Buah Batu, Sukapura, Dayeuh Kolot, Bandung 40257, Indonesia

Abstract

Dye sensitized solar cell (DSSC) is a third generation solar cell that has become an interesting research topic on energy area due to its properties such as low cost, green technology and simple fabrication. DSSC is mainly constructed with three components consisting of semiconductor photoelectrode, counter electrode and an electrolyte, which usually contains 𝐼𝐼−/𝐼𝐼3− redox couple. Liquid electrolyte is commonly used in standard DSSC device, although it is vulnerable to leakage and susceptible to the environment. Furthermore, liquid electrolyte could react to some kind of sealing material that encapsulates the device as it affect the stability performance. Accordingly, this research attempted to develop quasi-solid-state DSSC (QS-DSSC) by replacing liquid to gel electrolyte in a sandwich structured DSSC with a size of 0.5 cm x 0.5 cm per unit cell. The gel electrolyte prepared in this work was based on liquid electrolyte that was mixed with 𝑇𝑇𝑇𝑇𝑂𝑂2 and polymer material in the form of PVDF with various compositions for optimizing the gel electrolyte material. The performance of QS-DSSC samples was investigated by I-V measurement using sun simulator with light intensity of 500 watt/m2. The best performance of QS-DSSC sample achieved in this work had short-circuit current density, open-circuit voltage, fill factor and photoconversion efficiency of 3.532 mA/cm2, 0.610 V, 0.65, and 2.78%, respectively.

Keywords: Quasi-solid state DSSC, gel electrolyte, polymer material


76


[ABS-146] PRELIMINARY RESULT ON THE rGO FUNCTIONALIZATION

AS COUNTER-ELECTRODE IN DYE-SENSITIZED SOLAR CELLS (DSSC)

Waode Sukmawati Arsyad (a*), Ahmad Wardianto (a), La Agusu (a), Rahmat Hidayat (b)

a) Physics Department, Faculty of Mathematics and Natural Sciences, Halu Oleo University, Kendari, South East Sulawesi, Indonesia

*[email protected] b) Physics Department, Faculty of Mathematics and Natural Sciences, Bandung Institute of

Technology, Bandung, West Java, Indonesia

Abstract

In the effort of replacing Platinum (Pt) based counter-electrode (CE) for reducing fabrication cost in dye-sensitized solar cell (DSSC), we synthesized rGO powder from graphite bar (commercially available) using modified Hummer’s method with introduction of microwave irradiation. rGO was attached to the FTO surface by dissolved it in the solvent with the addition of ethyl selulose (ES) following by two-step annealing process. rGO solution was deposited by spin coating technique with different thickness namely 1 layer rGO (A1), 5 layer rGO (A2), 10 layer rGO (A3) and 15 layer rGO (A4) followed by annealing process, and the reference cell was assigned as A5 (using Pt). From the thin film resistance measurement using four-probe method and conductivity calculation, the conductivity firstly increased as the rGO layer becomes thicker, namely (0.58 to 0.61) S/cm for A1 and A2, and then decreased with the amount of rGO layer added namely (0.09 and 0.03) S/cm for A3 and A4. From the photovoltaic measurement we found that, the utilization of rGO as catalyst in CE increased the efficiency of the cell from 3.82% (A5) to 4.52% (A1). Furthermore, increasing the thickness of rGO layer from A1 (2.1 µm) to A2 (10.5 µm) also increased the efficiency from 4.52% to 5.89%, further increasing on the layer thickness A3 (21 µm) to A4 (31.5 µm) reduced the conversion efficiency to 2.57% and 0.33%. The overall conversion efficiency and the current density (Jsc) value of the DSSC with CE using rGO catalyst were in a good agreement with its conductivity value. The highest conversion efficiency achieved for the cell with 10.5 µm thickness of CE, specifically A2. Further investigation on the influence of CE thickness and conductivity to the internal parameters of the DSSC must be done in order to gain much better understanding to this result.

Keywords: rGO, DSSC, counter-electrode, conductivity, photovoltaic, efficiency


77


[ABS-151] Photocurrent Enhancement by Localized Surface Plasmon Resonance

of Gold and Silver Nanoparticles in Dye Sensitized solar Cells

Herlin Pujiarti, *Priastuti Wulandari, Agustinus A. Nugroho, and Rahmat Hidayat

Physics Department, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Strong localized surface plasmon resonance (LSPR) wave that exhibited from metal nanoparticles enhance both the photon absorption, photocurrent and thus improve the power conversion efficiency (PCE) in dye sensitized solar cell devices.[1,2] In this study, we investigate the mechanism and kinetics of charge carrier generation and transport of dye sensitized solar cell type of devices and the investigation is focused on the play role of surface plasmon generated by incorporated of gold and silver nanoparticles on charge generation kinetics. In this research work, we compared the use of gold nanoparticles capped by 1-octanethiols (AuNPs) and silver nanoparticle capped myristate (AgNPs) [3] that are being incorporated in the dye N-719 of dye sensitized solar cell devices for investigation of photocurrent enhancement. Characterization of fabricated devices is done by use static measurement, the J-V characterizations including the determination of the Filling Factor (FF) and the power conversion efficiency under standard conditions (simulated sunlight AM1.5) are carried out.

Keywords: LSPR, Gold nanoparticles, Silver nanoparticles, DSSC


78


[ABS-177] Characteristics of Quasi-Solid State DSSC using Poly-ionic liquid

Electrolyte

Herlin Pujiarti, Herman, and Rahmat Hidayat

Physics of Photonics and Magnetism Research Division, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology

Abstract

Poly(ionic liquid)s, which is abbreviated as PILs, have attracted much attention for various types of applications for replacing conventional electrolyte. The use of PILs have been being considered may improve the durability of dye sensitized solar cells (DSSCs). In this presentation, we report the preparation of a siloxane based PIL from triethoxy-3-(2-imidazolin-1-yl)propylsilane (TEIPS) and 3-(trimethoxysilyl)propyl methacrylate (TMSPMA) by a sol-gel method, which is followed by triiodide-iodide salt. The molecular structure of the resulted PIL was analysed by FTIR and NMR spectroscopies. The disappearance of the strong peak at chemical shift around 3.54 ppm, which can be assigned from methyl protons in Si–OCH3 groups, in the resulted PIL spectrum provides a strong evidence of cross-linking between those two monomers. Its ionic conductive properties were studied by electrochemical impedance spectroscopy (EIS) measurements. In order to investigate the possibility of this PIL to produce a DSSC with efficient photovoltaic performance, the I-V measurements of DSSCs using this PIL have been carried out. The measurement results show that in efficient DSSCs can be achieved for short immersion time of 𝑇𝑇𝑇𝑇𝑂𝑂2 substrate in the dye solution. The cells with this PIL shows a comparable photovoltaic performance in comparison to the corresponding reference cells that use ionic liquid electrolyte. However, for longer immersion time, the cells performance decreases in comparison to their reference cells. This performance reduction, however, is likely caused by scarce PIL penetration due to excessive dye adsorption filling the void of 𝑇𝑇𝑇𝑇𝑂𝑂2 mesoporous layer, which can be solved by using 𝑇𝑇𝑇𝑇𝑂𝑂2 layer with larger porosity and shorten the its immersion time in dye solution.

Keywords: Dye-sensitized solar cells, ionic liquid, poly(ionic liquids), charge transport, electrochemical impedance spectroscopy


79


[ABS-185] Influence of Humid Atmosphere during the Perovskite Layer

Preparation on the Characteristics of Its Solar Cells

Adhita Asma Nurunnizar, Rahmat Hidayat

Physics of Photonics and Magnetism Research Division, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung, West Java, Indonesia

Abstract

Organometal halide perovskite (hybrid perovskite) materials have emerged as promising material for high power conversion efficiency and low-cost solar cells. The formation of organo-metal halide perovskite layer, however, is very sensitive to some process parameters such as concentration, temperature, and humidity. In this presentation, we report the preparation of this perovskite crystal layer of 𝐶𝐶𝐻𝐻3𝑁𝑁𝐻𝐻3𝑃𝑃𝑃𝑃𝐼𝐼3 (𝑀𝑀𝑀𝑀𝑃𝑃𝑃𝑃𝐼𝐼3) under relatively humid air atmosphere on various electron transport layer. We found that the formed layer tends to form a black color layer on the top of dark brown color perovskite layer due to the humidity. The black color layer show a poor x-ray diffraction (XRD) pattern and produce poor solar cell characteristics.

Keywords: organometal halide perovskite, solar cells, humidity


80

Topic: MS Various Aspects of Combinatorics

[ABS-257] Explicit constructions of spherical designs from ball designs and simplex

designs

Mohammad Samy Baladram

Tohoku University

Abstract

A spherical 𝑡𝑡-design is a finite set of points on the 𝑛𝑛-dimensional unit sphere 𝑆𝑆𝑛𝑛 such that the average value of any polynomial 𝑓𝑓 of degree at most 𝑡𝑡 on the set equals the average value of 𝑓𝑓 on the whole sphere. Rabau and Bajnok showed that it is possible to construct a spherical design on 𝑆𝑆𝑛𝑛 using a design on an interval [−1,1], that is, an interval 𝑡𝑡-design, and a spherical 𝑡𝑡-design on 𝑆𝑆𝑛𝑛−1. Motivated by this result, we introduce a generalization of interval 𝑡𝑡-designs to higher dimensions as ball 𝑡𝑡-designs on 𝐵𝐵𝑑𝑑. By using this and some spherical designs on 𝑆𝑆𝑛𝑛, we construct spherical designs on 𝑆𝑆𝑛𝑛+𝑑𝑑 for 𝑑𝑑 ≥ 2. By this method, we explicitly construct spherical 5-designs on 𝑆𝑆𝑛𝑛 for every 𝑛𝑛. Moreover, the construction proposed by Rabau and Bajnok can be seen as a composition of spherical 𝑡𝑡-designs on 1- and 𝑛𝑛-dimensional spheres with the help of some interval 𝑡𝑡-designs. We propose a construction method for spherical 𝑡𝑡-designs on 𝑆𝑆𝑛𝑛 by using some designs with the same strength on lower dimensional spheres whose sum of the dimensions is 𝑛𝑛 + 1. To do this, we will introduce another generalization of interval 𝑡𝑡-designs on (0,1] to higher dimensions as 𝑡𝑡-designs on a simplex. By this method, we explicitly construct spherical designs on 𝑆𝑆3 for an arbitrary strength.

Keywords: spherical design, cubature formula, simplex design


81


[ABS-266] Complementary Ramsey numbers and Ramsey graphs

Akihiro Munemasa, Masashi Shinohara

Graduate School of Information Sciences, Tohoku University, Sendai, Japan; Faculty of Education, Shiga University, Otsu, Japan

Abstract

For any given positive integers 𝑛𝑛1, … ,𝑛𝑛𝑐𝑐, there exists a positive integer 𝑁𝑁 such that if the edges of a complete graph of order 𝑁𝑁 are colored with 𝑐𝑐 different colors, then for some 𝑇𝑇 between 1 and 𝑐𝑐, there exists a complete subgraph of order 𝑛𝑛𝑖𝑖 all of whose edges have colors different from 𝑇𝑇. The smallest such integer 𝑁𝑁 is called the complementary Ramsey number and is denoted by 𝑅𝑅�(𝑛𝑛1, … ,𝑛𝑛𝑐𝑐). For 𝑐𝑐 = 2, this is nothing but the ordinary Ramsey number 𝑅𝑅(𝑛𝑛2,𝑛𝑛1) which is the smallest positive integer 𝑁𝑁 such that every graph on 𝑁𝑁 vertices has clique number at least 𝑛𝑛2 or independence number at least 𝑛𝑛1. A graph is said to be Ramsey (𝑛𝑛2,𝑛𝑛1)-graph if it fails to satisfy this last condition. Ramsey (𝑛𝑛2,𝑛𝑛1)-graphs have been enumerated for small (𝑛𝑛2, 𝑛𝑛1), and we use the result to find upper bounds on complementary Ramsey numbers 𝑅𝑅�(𝑚𝑚,𝑛𝑛1,𝑛𝑛2) for small (𝑛𝑛2,𝑛𝑛1).

Keywords: Ramsey number, Ramsey graph, clique number, independence number


82


[ABS-119] On Ramsey (𝒎𝒎𝒎𝒎𝑻𝑻,𝑷𝑷𝑷𝑷)-minimal graphs

Kristiana Wijaya(1), Edy Tri Baskoro(2), Hilda Assiyatun(2), Djoko Suprijanto(2)

(1) Graphs, Combinatorics, and Algebra Research Group, Department of Mathematics, FMIPA Universitas Jember

(2) Combinatorial Mathematics Research Group, FMIPA, Institut Teknologi Bandung

Abstract

For given graphs 𝐺𝐺 and 𝐻𝐻, a (𝐺𝐺,𝐻𝐻)-coloring of a graph 𝐹𝐹 is a red-blue coloring of edges of 𝐹𝐹 such that 𝐹𝐹 contains neither a red copy of 𝐺𝐺 nor a blue copy of 𝐻𝐻. The graph 𝐹𝐹 (without isolated vertices) is called a Ramsey (𝐺𝐺,𝐻𝐻)-minimal graph if every red-blue coloring of edges of 𝐹𝐹 contains a red copy of 𝐺𝐺 or a blue copy of 𝐻𝐻, but for each 𝑒𝑒 ∈ 𝐸𝐸(𝐹𝐹) there exists a (𝐺𝐺,𝐻𝐻)-coloring of 𝐹𝐹 − 𝑒𝑒. We study the properties of Ramsey (𝐺𝐺,𝐻𝐻)-minimal graphs, where 𝐺𝐺 is a matching, 𝑚𝑚𝐾𝐾2, and 𝐻𝐻 is a path on 𝑛𝑛 vertices, 𝑃𝑃𝑛𝑛. We show that a Ramsey (𝑚𝑚𝐾𝐾2,𝑃𝑃𝑛𝑛)-minimal graph contains no graph with two adjacent pendant edges.

Keywords: Ramsey minimal graph, matching, path graph


83


[ABS-154] Study of Ocean Current Energy Potential in Lembeh Strait Using 3-

Dimension Hydrodynamic Model

Altof Naufal(a), Totok Suprijoa(b), Mira Yosib(b), Del Yusar(b)

a) Bandung Institute of Technology, Gasnesha Street no 10, Bandung 40132, Indonesia b) Pusat Penelitian dan Pengembangan Geologi Kelautan, Dr. Djunjunan no. 236, Bandung,

Indonesia

Abstract

This paper provides an initial assessment of potential energy of tidal currents in the Lembeh Strait, North Sulawesi. Using two and three dimensional ocean hydrodynamic model, the assessment was done. A nesting method has been applied in order to simulate tidal currents in the Sulawesi Sea and the Lembeh Straits. Three dimensional simulation results at the Lembeh straits was validated using observation data, which are obtained from filed measurement campaign on 3 to 23 April 2016. Estimation of tidal current or tidal stream power was focused in the Lembeh Straits. The simulation results show power density during a tidal cycle can reach maximum value about 72.346,23 W/m2 at full moon condition. This amount of power is stored at the area between Sarena Island and Sulawesi Island. Result of tidal stream power estimation also reveals strong tidal currents that associated with maximum power occur during flood tide condition.

Keywords: 3D Hydrodynamic Model, Ocean Current, Ocean Current Energy


84


[ABS-243] Methods to obtain complementary sequences

Pritta Etriana Putri


Abstract

It is known that Hadamard matrices of order 4n can be obtained by using T-sequences with length n and Goethals-Seidel arrays. Note that T-sequences is a special case of complementary sequences. We will introduce some multiplication method, including Yang multiplication, to obtain some classes of complementary sequences.

Keywords: complementary sequences, Hadamard matrices


85

Topic: Chemistry

[ABS-263] The Optimation of Diels-Alderase Activity from the root culture of

Morus shalun

Rahmat Kurniawan (a*), Rukman Hertadi (b), Euis H. Hakim (a)

a) Organic Chemistry Laboratory of Natural Product, Department of Chemistry, Institute of Technology Bandung, Bandung, Indonesia

b) Biochemistry Laboratory, Department of Chemistry, Institute of Technology Bandung

Abstract

Morus known as Mullbei in West Java is a plant in the Moraceae family. Morus widely cultivated for silkworm feed and several parts of Morus used for traditional Chinese medicines, likes the roots bark of Morus, had been practiced to medicate certain diseases such as arthritis, rheumatism, and diabetes. The recent investigation of Root culture of Morus is reported to contain Diels-Alder adduct compound with potential bioactivity. An early study of the root culture of Morus shalun had identified the activity of Diels-Alderase enzyme. The Dies-Alderase catalyzes [4 + 2] cycloaddition reactions in the biosynthetic pathway of secondary metabolic compounds. This reaction comes from 1,3-diene and dienophile into a cyclohexene ring, leads to form a new two carbon bond. This investigation to develop the optimation of Diels-Alderase activities from roots culture of M. shalun, including cell culture of M. shalun, Diels-Alderase isolation, and examines the activities of Diels-Alderase by analytical LCMS method using Response Surface Methodology design.

Keywords: Morus shalun, Diels-Alder adduct, Diels-Alderase, [4+2] cycloaddition reaction


86

Topic: Chemistry

[ABS-267] Synthesis of 𝑭𝑭𝑭𝑭𝑭𝑭𝑻𝑻𝑭𝑭 Nanoparticles for Colour Removal of Printing Ink

Solution

Nanda Raudhatil Jannah*, Djulia Onggo

Chemistry Teaching Program, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia.

*[email protected]

Abstract

𝐹𝐹𝑒𝑒3𝑂𝑂4 nanoparticles can be used as an adsorbent for colour removal of printing ink which contribute as a pollutant in wastewater. 𝐹𝐹𝑒𝑒3𝑂𝑂4 was synthesized by coprecipitation method using 𝐹𝐹𝑒𝑒𝐶𝐶𝑙𝑙3. 6𝐻𝐻2𝑂𝑂 and (𝑁𝑁𝐻𝐻4)2𝐹𝐹𝑒𝑒(𝑆𝑆𝑂𝑂4)2. 6𝐻𝐻2𝑂𝑂 precursors dissolved in distilled water in mol ratio of 𝐹𝐹𝑒𝑒3+: 𝐹𝐹𝑒𝑒2+ = 2 ∶ 1. 𝑁𝑁𝑁𝑁𝑂𝑂𝐻𝐻 solution was added slowly into the iron solution with continuous stirring for 60 minutes in Argon gas atmosphere. After drying, 𝐹𝐹𝑒𝑒3𝑂𝑂4 nanoparticle product is obtained as black crystalline powder with an average particle size about 34 nm. The 𝐹𝐹𝑒𝑒3𝑂𝑂4 nanoparticles (0.1 g) are able to remove blue, red, and yellow colour with percentage of adsorption about 97%, 94%, and 62% for 40 minutes contact time and 100 rpm of stirring speed, respectively. 𝐹𝐹𝑒𝑒3𝑂𝑂4 nanoparticle can be separated from the printing ink solution by an external magnetic field.

Keywords: Nanoparticle, 𝑭𝑭𝑭𝑭𝑭𝑭𝑻𝑻𝑭𝑭, Adsorption, Printing Ink


87

Topic: Chemistry

[ABS-13] A New Way to Improve Physicochemical Properties of Potato Starch

Yassaroh Yassaroh*, Albert J. J. Woortman, Katja Loos

Macromolecular Chemistry and New Polymeric Materials, Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

*[email protected]

Abstract

Starch is an important class of macromolecules for human nutrition. Starch is mainly used as a major source of energy. However, its rapid digestibility leads to a high amount of glucose released into the blood and contributes to the high risk of obesity and diabetes type II. For this reasons, modification of the starch to obtain a desired physicochemical properties while preserving its granular structure was conducted. Heat-moisture treatment (HMT) was applied prior to complexation with linoleic acid. The influence of HMT and amylose-linoleic acid inclusion complexes on the thermal properties and viscosity behavior were studied using DSC and RVA, respectively. The effect on the granular structure was observed with light microscopy and the starch crystallinity was analyzed by XRD. The DSC heating profile implied that the HMT enhanced the formation of amylose-linoleic acid complexes, particularly when the complexation was succeeded at 70°𝐶𝐶. The RVA profile demonstrated a clear shift of pasting temperature, lower peak viscosity, and less breakdown due to less swelling. Granule-like appearance was still obtained after complexation at 70°𝐶𝐶 for 30 minutes and heating until 85°𝐶𝐶 afterward. The combination of HMT and linoleic acid addition improved the stability of the starch granules towards heating and shearing.

Keywords: Heat-moisture treatment; amylose inclusion complexes; linoleic acid; thermal transition; viscosity behavior; potato starch granular structure; crystallinity


88

Topic: Chemistry

[ABS-19] Improvement Strategies of Coulometric Microdevice Based on

Metallization Principle

Isa Anshori (*)

Biomedical Engineering Research Group, School of Electrical Engineering and Informatics, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Microdevice based on metallization principle and coulometry analysis gave a potential for analyte detection (molecules, protein) in a small volume. In previous device, the structure was constructed with a liquid junction and two separated flow channels; one flow channel for the oxidation of analyte and another flow channel for metal deposition. In this work, the liquid junction was replaced with a metal junction or using a voltage source to promote the redox reactions simultaneously. These strategies give the flexibility in controlling the potentials of the electrodes during the metallization. Enhanced deposition of metal to improve the detection sensitivity was obtained by increasing the potential difference between the solutions from the two flow channels.

Keywords: Metallization; Coulometry detection


89

Topic: Chemistry

[ABS-278] Systematic Study on Sensing Capability of Gold(I) Pyrazolate Complex

for Vapochromic Phosphorescent Chemosensors of Ethanol Vapors

Almira Praza Rachmadian(1), Nur Fatiha Ghazalli(2), Leny Yuliati(1,3), Hendrik O. Lintang(1,3)

1) Department of Chemistry, Faculty of Science and Technology, 3) Ma Chung Research Center for Photosynthetic Pigments, Universitas Ma Chung, Malang 65151, East Java, Indonesia 2) School of Dental Sciences, Universiti Sains Malaysia, 16150 Kubang Kerian, Kelantan,

Malaysia

Abstract

Luminescent metal complexes have been developed for the chemosensors of volatile organic compounds (VOCs) such as ethanol due to their responsive changes in emission properties. Such reports have been only focused on platinum and gold complexes as dinuclear adduct with silver bridge ion, cluster with other metal ions and bimetallic sandwich adduct with other complexes. Recently, we have reported that trinuclear Cu(I), Ag(I) and Au(I) pyrazolate complexes with phosphorescent properties revealed emission changes upon interaction with ethanol vapors in which the Cu(I) complexes showed the best sensing capability. Although Au(I) also showed almost the same sensing capability and have high stability as well as have synthesized from cheaper metal salt precursors compared to another group 11 complexes, there is no systematically report on this chemosensor. In this study, by using the same trinuclear Au(I) pyrazolate complex from dimethoxy benzyl pyrazole ligand, we report the systematic study on sensing capability such as distance and concentration of the vapors to sense as well as real-time monitoring for sensing ethanol. In this case, the sensor was placed at a distance of 2.75, 5.5, 11, 16.5 and 22 cm from ethanol vapors with various concentrations of 80 until 160 µL (20 µL increment) in 5 mins. It was found that the Au(I) complex showed blue-shifting of its emission band centered at 604 nm in 20 nm (584 nm). This chemosensor also showed complete recovery of its original emission wavelength without external stimuli. Real-time monitoring under exposure to ethanol vapors at the certain distance and concentration will be also discussed in detail. It is expected that the best sensing capability of the complex can be evaluated based on the phosphorescent changes.

Keywords: emission, chemosensor, Gold(I) complex, luminescence, sensor


90

Topic: Chemistry

[ABS-281] Synthesis and Characterization of Zn(II) Complex with (E)-2-((2-

hydroxybenzylidene)amino)acetic acid ligand as Antidiabetic Type 2

Michael Yonathan Suryana, Irma Mulyani, Ph.D., Anita Alni, Ph.D.

Bandung Institute of Technology

Abstract

Nowadays, potential of complexes compound in medical scope has been studied by many researchers. Many complexes of Zn(II) with Schiff base’s derivative have been synthesized and studied its potential as antidiabetic type 2. In this research, synthesis of complex of Zn(II) with (E)-2-((2-hydroxybenzylidene)amino)acetic acid ligand have been conducted. This complex was obtained by reaction between salt ion Zn(II) with salicylaldehyde and glycine in methanol and water solvents. Both reactions occured with KOH as catalyst. Stoichiometry ratio in both reactions are Zn(II):Salicylaldehyde:Glycine = 1:1:1. Both complexes was synthesized within in situ method, where salt Zn(II) reacted directly with two precursors of ligand formation. H-NMR analysis result of Complex showed there is a singlet signal at chemical shift 8,37 ppm which due to proton of imine H-C=N-H. H-NMR analysis result showed that complex has been successfully synthesized. Based on analysis of Zn content by AAS, this complex predicted has molecular formula [ZnL(H2O)].4H2O (L = Ligand). FT-IR spectrum of complex showed that imine peak at wavenumber 1644 cm−1. Spectrum showed there is no aldehyde peak at wavenumber more than 1700 cm−1. Beside of that, FT-IR spectrum of complex compared to ligand, there are some significant peak shifts. Potential this complex as antidiabetic type 2 has been studied through bioactivity study from inhibition activity of alpha-amylase by in vitro. Bioassay showed that 3 uM of this complex gives %inhibition as much as 10.1%.

Keywords: Complex of Zn(II), synthesis in situ, antidiabetic type 2


91

Topic: Chemistry

[ABS-283] Secondary Metabolites from Aspergillus terreus, an endophytic fungus of sponge Aaptos suberitoides from Taman Nasional Kepulauan Seribu

Yunita Purnamasari, Elvira Hermawati, Euis Holisotan Hakim

Natural Product Research Group, Departement of Chemistry, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology

Abstract

Sponge is one of the marine organisms which cannot move or cannot be sessile. To maintain themselves from the distractions of other organisms and the environment, secondary metabolites are secreted by sponges to do the chemical defense. In addition, sponges are assisted by microbes which have symbiosis mutualism inside the internal network to maintain their bodies. One of those microbes is endophytic fungi living in various sponges host without causing negative effect to their host and produceg secondry metabolites with various biological activities. In this research, endophytic fungi were isolated from sponges Aaptos suberitoides by culturing method consist of three steps: sterilization, inoculation and subculture on a solid medium Malt Extract Agar (MEA), to obtain single strain fungus. Identification of the fungus showed that the species is Aspergillus terreus. Cultivation of the endophytic fungus on Wickerham’s liquid media was incubated at 28°𝐶𝐶. After 14 days, the liquid media were separated from the mycelial and the filtrate were extracted with ethyl acetate to give 1.8 g crude extract. The crude extract was fractionated and purified using various chromatography methods to obtain two compounds. Determination of all isolated compound structure has been conducted according to spectroscopic data, i.e. 1D-NMR (1H-NMR and 13C-NMR), 2D-NMR (HSQC and HMBC) and MS. Two pure compounds have been characterized as butyrolactone I and methyl 3,4,5-trimetoxy-2-(2-(nicotinamido) benzamido) benzoate. These compounds were reported as bioactive compounds such as anticancer, antimicrobe, and antidiabetic.

Keywords: Marine organisms, endophyte fungi, Aspergillus terreus, butyrolactone


92

Topic: Chemistry

[ABS-287] The Synthesis of 3-(2-Hydroxyphenyl)-1-phenylprop-2-en-1-one in

Imidazole-Derivative Ionic Liquid Medium Utilizing MAOS (Microwave Assisted Organic Synthesis)

Hilda Taslam Fuadi (a), Deana Wahyuningrum (b*), Sophi Damayanti (c)

a) Bachelor in Chemistry, b) Organic Chemistry Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

*[email protected] c) Pharmaco-chemistry Research Division, School of Pharmacy, Institut Teknologi Bandung

Abstract

The alpha,beta-unsaturated carbonyl compounds or commonly known as chalcone are well known to possess many biological properties such as anti-cancer, anti-inflammatory, antimicrobial, antifungal, antioxidant, and antitumor activities. In this study, chalcone compounds were obtained by reacting salicylaldehyde and acetophenone to produce 3-(2-Hydroxyphenyl)-1-phenylprop-2-en-1-one which can be further transformed into flavones. This reaction takes place in ionic liquid medium and utilizing Microwave Assisted Organic Synthesis (MAOS) method to apply the green chemistry principles. The ionic liquids used as medium are the imidazole derivative ionic liquids which are 1-decyl-3-methylimidazolium bromide ([DMIm]Br) and 1-dodecyl-3-methylimidazolium bromide ([DDMIm]Br). ([DMIm]Br) and ([DDMIm]Br) were synthesized utilizing MAOS method at 300 W and 50°𝐶𝐶 for 60 minutes and produced yields of 62.24% and 40.33% respectively. Acetophenone and salicylaldehyde were reacted using 1:1 mole ratio in the mixtures of ionic liquid : water = 1: 5 (w/v) as solvent and in an alkaline condition utilizing MAOS method (P = 300 W, T = 60°𝐶𝐶). This process producing up to 55.13% yields, which is, at reaction time of 35 minutes in [DDMIm]Br : water = 1:5 (w/v). The melting point of the synthesized chalcone is 154 − 155°𝐶𝐶. The structure confirmation of 3-hydroxyphenyl-1-phenylpropenone was carried out by IR characterization, as well as NMR spectroscopy with TOCSY analysis which showed the existence of trans coupling (J = 15.8 Hz) that corresponds to the structure of chalcone.

Keywords: Chalcone, 3-Hydroxyphenyl-1-phenylpropenone, acetophenone, salicylaldehyde, ionic liquids, MAOS (Microwave Assisted Organic Synthesis), imidazole derivative


93

Topic: Chemistry

[ABS-290] The Synthesis of Glutaraldehyde-modified Chitosan Utilizing MAOS

(Microwave Assisted Organic Synthesis) Method as Adsorbent of Pb(II) Ions Contained in Water Sample of Cikapundung River - Bandung

Herayati Sawiri (a), Deana Wahyuningrum (b)

(a) Bachelor in Chemistry, (b) Organic Chemistry Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Abstract

Indonesia has a vast territory. Approximately 2/3 of Indonesia is water. Indonesia has almost 6% of the worlds water resources or approximately 21% of water resources in the Asia Pacific region. Indonesian waters comprise 97.4% seas and 2.6% are rivers, lakes and straits. There are 309 rivers in Indonesia and 49 of them flow in Bandung, one of them is Cikapundung River. Pb(II) ion contained in Cikapundung River has exceeded the quality standard of water river. Therefore, it is necessary to reduce the amount of Pb(II) ion from the river. One of the solutions is the usage of the application of biodegradable adsorbent, the glutaraldehyde-modified chitosan. Chitosan was obtained from deacetylation of chitin in basic condition. The chitosan was characterized using FTIR showed 85.5% degrees of deacetylation. The other characterization is determination of average molecular mass based on Ostwald viscometry method, obtained the average molecular mass of chitosan is 2.7 x 106 g/mol. Furthermore, chitosan was modified by reacting with glutaraldehyde using MAOS (Microwave Assisted Organic Synthesis) at 80℃ with irradiation power of reaction 100 W for 60 minutes to form glutaraldehyde-modified chitosan with 79% degree of substitution. The synthesized glutaraldehyde-modified chitosan was characterized by FTIR, SEM, SAA and applied as adsorbent of Pb(II) ion. The results showed that the optimum condition of adsorption for 15 mL of Pb(II) solution was achieved at pH 4, 0.075 gram of adsorbent mass and 90 minutes contact time. The adsorption process of Pb(II) ion follows the Langmuir isotherm model and the pseudo-second order kinetics with percent adsorption of Pb(II) ions from the water sample of Cikapundung river is 84% (for sample from middle-stream) and 50.2% (for sample from downstream).

Keywords: Adsorbent, Pb(II) ions, Chitosan, Glutaraldehyde-modifed chitosan, MAOS (Microwave Assisted Organic Synthesis), Cikapundung River, Pollutant, Bandung


94

Topic: Chemistry

[ABS-292] Biodiversity study of Indonesia marine microalgae

Elfira Rosa Pane, Zeily Nurachman, Yanti Rachmayanti

ITB

Abstract

DNA barcoding is a taxonomic method that uses a short genetic marker in an organisms DNA to identify the species of the organism. Standardized bar codes that have been used for species identification quickly and accurately are for animal species identification, but for other organisms it has not been agreed upon by the Consortium of Barcode of Life (CBOL). Diatoms are the microalgae of the Bacillariophyta group consisting of many species. Diatoms that live in colonies are sometimes found in aquatic habitats as free-living photosynthetic autotrophs, or heterotrophs that are colorless, or as photosynthetic symbiotics. The territory of Indonesia has an ocean area of 6,653,341,439 km2 which is affected by the Pacific Ocean, Indian Ocean and South China Sea. The mixing of water masses from these three Oceans causes the mixing of nutrients that have the potential to produce microalgae biodiversity that is unique in the Indonesian Sea region. However, the data on diatom biodiversity in the Indonesian Sea do not yet exist, therefore this study has carried out a study of marine diatom biodiversity, especially in the western part of Indonesia which is influenced by the flow of water from the South China Sea. In the ITB Biochemistry Laboratory there were 11 samples of marine diatoms which morphology had been observed, but it was difficult to identify the type of microalgae if only based on morphological observations. Subsequent identification was carried out by genetic method, namely amplification with the Polymerase Chain reaction (PCR) method for 1000 pb of rbcL gene fragments using single microalgae cells. Of the 11 samples, 4 samples have been identified to the species level. In addition, microalgae DNA isolation has been successfully carried out using a modified CTAB method with the addition of sonication during cell breakdown.

Keywords: marine microalgae, rbcL gene, PCR, DNA barcode, molecular methods, biodiversity


95

Topic: Chemistry

[ABS-294] The Effects of Lithium Acetate Content towards the Properties of Cellulose Acetate-Based Solid Polymer Electrolyte for Lithium Ion

Battery

Anif Fatmawati (a), Deana Wahyuningrum (b,*), I Made Arcana (c,**)

a). Physical Chemistry Laboratory, Master Program in Chemistry, b). Organic Chemistry Research Division, c). Inorganic and Physical Chemistry Research Division, Faculty of Mathematics and

Natural Sciences, Institut Teknologi Bandung *[email protected], **[email protected]

Abstract

Cellulose acetate is one of the cellulose derivatives which have been widely developed as polymer electrolyte membrane for lithium ion battery application because of its abundant, biodegradable, and high mechanical properties. However, it has a low ionic conductivity due to its high crystalline nature. Therefore, in this study, cellulose acetate membrane was doped with lithium acetate to provide the presence of Li+ ions and to convert the highly crystalline phase of cellulose acetate into amorphous phase for better ionic conductivity. Cellulose acetate/Li-acetate membrane was prepared by solvent evaporation technique. The various compositions of lithium acetate in membranes was done to get the optimum composition which has optimum ionic conductivity and mechanical strength. The addition of Li-acetate into the cellulose acetate has increased the ionic conductivity from 9.20 x 10-5 S/cm to 2.58 x 10-3 S/cm at the ratio of 95/5 (b/b) cellulose acetate/Li-acetate, but the tensile strength and elongation at break of membranes decreased up to 46.66 MPa and 3.47%, respectively. The XRD analysis demonstrated that the increment of Li-acetate up to 5% decreased the crystalline peaks of cellulose acetate membrane which is compliance with increasing of the ionic conductivity. Furthermore, SEM analysis showed that the addition of Li-acetate changed morphology of the membrane to become less homogenous. In addition, the thermal stability of the cellulose acetate/Li-acetate membrane was still within the accepted value that is 282°𝐶𝐶. Based on the results above, the cellulose acetate/Li-acetate membrane with ratio of 95/5 (b/b) is potential as the polymer electrolyte membrane for lithium ion battery application with its ionic conductivity is higher than that of the original cellulose acetate membrane, and it is still capable to maintain the thermal stability and tensile strength values above the minimum requirements of polymer electrolyte membranes used in lithium ion battery.

Keywords: cellulose acetate, lithium ion battery, lithium acetate, polymer electrolyte, SEM, XRD


96

Topic: Chemistry

[ABS-306] Free Energy Calculation of Glucose and it’s Derivative using Classical

Molecular Dynamics as Enhanced Oil Recovery Agent

Aji Santoso, Mia Ledyastuti, Ph.D

Chemistry, Faculty of Mathematics and Natural Science, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Cellulose is a natural polymer that has the potential to be used as an enhanced oil recovery (EOR) agent. One of the requirements of an EOR agent is that it can dissolve in water. Thermodynamically, Gibbs free energy can be used as a solubility parameter for a substance in a solvent. In this study, Gibbs free energy dissolution was calculated by the molecular dynamics method. As the initial model of cellulose glucose is chosen in the form of monomers and trimers. The results showed the Gibbs free energy values for monomers and trimers of glucose were -10.32 kJ/mol and -19.97 kJ/mol.

Keywords: Cellulose, EOR, glucose, molecular dynamics, energy


97

Topic: Chemistry

[ABS-309] Synthesis Strategy of Nanostructured Titania with bcl Morphology

Fry Voni Steky(a), Veinardi Suendo(a*)

a) Inorganic and Physical Chemistry Research Division, Department of Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung

40132, Indonesia. *[email protected]

Abstract

Titanium dioxide (𝑇𝑇𝑇𝑇𝑂𝑂2) is one of semiconductor materials that plays an important role in technological development. One application of 𝑇𝑇𝑇𝑇𝑂𝑂2 is as a photocatalyst and catalyst support material. The arrangement of 𝑇𝑇𝑇𝑇𝑂𝑂2 morphology is important to support both applications. One of the most interesting morphologies today is the bicontinuous concentric lamellar (bcl) that has been successfully synthesized on silica-based materials. If the morphology is owned by 𝑇𝑇𝑇𝑇𝑂𝑂2 then the surface area and its accessibility will increase significantly. Slow hydrolysis is the key in the synthesis stage of monodispersed spherical 𝑇𝑇𝑇𝑇𝑂𝑂2 particles from Titanium (IV) Isopropoxide (TTIP) precursors through precipitation in ethanol. Modification of surface morphology of 𝑇𝑇𝑇𝑇𝑂𝑂2 particles is carried out by swelling method with ammonia and followed by phase segregation process in solvothermal process that produce particles in bcl morphology. The 𝑇𝑇𝑇𝑇𝑂𝑂2 particles of anatase structure with bcl morphology were obtained through calcination at 500°𝐶𝐶 for 1 hour. The products of each synthesis stage were characterized using SEM, HRTEM, XRD and Raman spectroscopy. Based on SEM characterization, it is known that the synthesis product has a bcl morphology with particle size of 500-2000 nm. The morphology of this material did not change significantly after the calcination process, but its structure changed from amorph to crystalline anatase polymorphs indicated by XRD and Raman spectra. Through the observation of HRTEM, it appears that the resulting 𝑇𝑇𝑇𝑇𝑂𝑂2 particle has a lamellar structure on the surface of the particle, while its center is arranged dense. The transition process from amorphous to anatase is clearly revealed by temperature dependent Raman measurement from 20 to 540°C, where an amorphous/anatase phase transition occurs over a temperature range of 380-400°C.

Keywords: bicontinuous concentric lamellar, slow hydrolysis, morphological modification, 𝑻𝑻𝑻𝑻𝑻𝑻𝑻𝑻 anatase, phase segregation


98

Topic: Chemistry

[ABS-315] Genetic Marker for Identifying Species of Microalgae

Yanti Rachmayanti (a), Sutomo (b), Ivonne Milichristi Radjawane (c), Dede Mulyaman (a), Elva Stiawan (a), Intan Safarina (a), Wa Ode Sri Rizki (a), Rika Felicita (a), Zeily Nurachman (a)

(a) Biochemistry Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung (ITB), Jl. Ganeca No. 10, Bandung – 40132, Indonesia

(b) Research Center for Oceanography, Indonesian Institute of Science (LIPI), Jl. Pasir Putih I, Ancol Timur, Jakarta – 14430, Indonesia

(c) Departement of Oceanography, Faculty of Earth Science and Technology, Bandung Institute of Technology, Ganseha 10st, Bandung, Indonesia

Coresponding author: [email protected]

Abstract

As a maritime country, Indonesian has a marine biodiversity in the form of microalgae that has broad utilization prospects. However, Indonesians tropical marine microalgae are not well collected and have not been carefully identified so that they are vulnerable to theft by other citizens. Investigation of microalgae species is generally based on morphological characteristics of cells. A more recent method of investigation is by means of DNA barcoding. So far, the DNA barcode consensus that is typical for investigating certain microalgae species has not been agreed upon. Therefore, efforts to trace specific marker genes for certain microalgae species need to be done. The stages of research include the provision of pure cultures of microalgae cells; taking photos of light microscopy and SEM images from microalgae cells; amplification of marker genes via PCR directly from microalgae cells; sequencing of the nucleotide marker genes; and analysis of morphological and genetic data from each microalgae species studied. The microalgae studied came from Indonesian marine waters. The investigation of the lines of TMA, TMA1, CLO, NLO, PrLO, and NLA was successfully carried out up to the species level, while the investigation of PLO, NPL, CUJ, CBO, and TMGS lines was successfully carried out to the genus level. Typical areas of marker genes have been found in each microalgae line and further conformations need to be made to be able to state these typical areas as special markers for Indonesian microalgae.

Keywords: microalgae, gene, marker, species


99

Topic: Chemistry

[ABS-96] Effect of cacao bean fermentation using starter of lactic acid bacteria

and yeast on flavonoids formation and antioxidant activity

Irvan Anwar (a), Titi Candra Sunarti (b), Anja Meryandini(c)

a)Study Program of Biotechnology, Bogor Agricultural University, Bogor, Indonesia. b)Department of Agroindustrial Technology, Bogor Agricultural University, Bogor, Indonesia.

c)Department of Biology, Bogor Agricultural University, Bogor, Indonesia.

Abstract

The aim of this study to investigate the effect of fermentation using lactic acid bacteria (LAB) and yeast as starters on the formation of flavonoid compounds and antioxidant activity of cocoa beans. To achieve these objectives, an analysis had been performed including extraction, flavonoid test, and activity test. The extraction process was by maceration, followed by flavonoid test with UV-Visible spectrophotometer, and antioxidant activity was analyzed by 1,1-difenil-2-pikrilhidrazil (DPPH) method. Extract yield obtained in sample F1 was 3.92 ±0.09%, F2 (4.62 ± 0.13%), F3 (3.99 ± 0.12%), F4 (4.39 ± 0.16%) and moisture content and residual solvents from each extract were F1 of 7.67 ± 0.12%, F2 (7.13 ± 0.23%), F3 (7.27 ± 0.31%), and F4 (7.20 ± 0.35%). Qualitative analysis of secondary metabolite content shows that all samples of ethanol extract of fermented cacao beans contain alkaloids, polyphenols, flavonoids, and tannins. The highest flavonoid content was obtained of F4 extract (5.99 ± 0.23), F2 (5.64 ± 0.05), F3 (5.37 ± 0.17), and F1 (4.35 ± 0.20) mg/L respectively. In case of antioxidant activity (determined using DPPH method), all sample extracts were recorded to show antioxidant activity. The highest antioxidant activity (% inhibition) was attributed to F4 sample (50.33 ± 0.43%), 48.05 ± 0.58% (F3), 46.45 ± 2.00% (F2), and 42.31 ± 0.66% (F1), respectively. IC50 value as the ability of ethanol extract in muffling 50% of DPPH highest radical obtained at F4 (88.28 mg/L), followed by F3 (97.31 mg/L), F2 (109.30 mg/L), and F1 (141.67 mg/L).

Keywords: antioxidant, cocoa bean, fermentation, flavonoid, lactic acid bacteria, yeast


100

Topic: Chemistry

[ABS-142] Study of Electrochemical Properties of Oxovanadium Complexes in

Imidazol-based Ionic Liquids

Yulia Rachmawati (a*), Dr. Aep Patah (b)

a) Department of Chemistry, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Department of Chemistry, Bandung Institute of Technology

Abstract

Oxovanadium complexes are capable to catalyze many reactions, for example oxidative process where metal reacts with peroxide then produces peroxometal species for organic substrate oxidation. Oxovanadium complexes, as catalyst, in chemical reactions commonly involve oxidation number transformation. In other hand, ionic liquids (ILs) recently are very attractive as solvents because they can enhance catalyst efficiency of metal transition complexes in oxidation reaction. In this study, electrochemical properties of oxovanadium-salen and oxovanadium-salophen in various ionic liquids have been studied using cyclic voltammetry method. Diffusion coefficient (D) and electron transfer rate constants (khet) of oxovanadium complexes were investigated in 1-butyl-3-methylimidazolium tetrafluoroborate (bmim BF4) and 1-butyl-3-methylimidazolium hexafluorophosphate (bmim PF6). The diffusion coefficients and electron-transfer rate constant were also measured in common organic solvent, like acetonitrile (with TBAPF6 as electrolyte). Randless-Sevcik equation and Nicholson method were used to determine the diffusion coefficients and electron-transfer rate constants, respectively. The results showed that diffusion coefficient of complexes in ILs are smaller 100-1000 times than in acetonitrile (bmim PF6 < bmim BF4 < acetonitrile). This indicated that the mobility of complexes in ILs is very much slow. Consequently, the heterogeneous electron transfer rate constants of complexes in ILs become smaller, compared in acetonitrile.

Keywords: Oxovanadium complexes, cyclic voltammetry, diffusion coefficient, electron transfer rate constants


101

Topic: Chemistry

[ABS-153] Study of the Electrochemical Properties of Complex Tris(2-(1H-

Pyrazol-1-yl) Pyridine) Cobalt (II) in Imidazole-based Ionic Liquids

Riyadini Utari; Dr. Aep Patah

Faculty of Mathematics and Science, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Cobalt-based complexes are considered can be used as redox mediators in dye-sensitized solar cells (DSSCs). The simpler kinetics mechanisms and requires less energy for the dye regeneration process are the best prominent properties in these Co-based complexes, yet it also is necessary to find the suitable medium. Ionic liquids are one of the option with their attractive properties, such as the wide liquid range, negligible vapor pressure, and high ionic conductivity. In this study, we investigated the electrochemical properties of the complex tris(2-(1H-pyrazol-1-yl)pyridine) cobalt (II) by cyclic voltammetry method in different imidazole-based ionic liquids, such as 1-butyl-3-methylimidazolium tetrafluoroborate (bmim BF4), 1-butyl-3-methylimidazolium hexafluorophosphate (bmim PF6), 1-butyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (bmim NTf2), and 1-ethyl-3-methylimidazolium (emim NTf2). A common organic solvent like acetonitrile (with 0.1 M TBAPF6 as electrolyte) is also used as comparison. The diffusion coefficients (D) and heterogeneous standard electron-transfer rate constants (khet) of complex tris(2-(1H-pyrazol-1-yl) pyridine) cobalt (II) were determined using the Randles-sevcik’s equation and the Nicholson’s method, respectively. The results showed that the diffusion coefficients and heterogeneous standard electron-transfer rate constants of complex tris(2-(1H-pyrazol-1-yl)pyridine) cobalt (II) in ionic liquids are smaller by 100-1000 times than in acetonitrile. Furthermore, bulkiness of ionic liquids (both cations and anions) affected the diffusion coefficients as well as the rate constant of complex tris(2-(1H-pyrazol-1-yl) pyridine) cobalt (II).

Keywords: Diffusion Coefficients; Cyclic Voltammetry; Ionic Liquids


102

Topic: Chemistry

[ABS-182] Olefin Epoxidation Catalyzed by dioxomolybdenum(VI) Complex at

Cu-MOF-2

Laela Mukaromah, Aep Patah*, Yessi Permana

Division of Inorganic and Physical Chemistry, Institut Teknologi Bandung Jalan Ganesha 10, Bandung 40132, Indonesia

*Corresponding author email: [email protected]

Abstract

Transition metal complexes have been widely used to catalyze olefin epoxidation, which is intermediate species used in chemical industries. Meanwhile, dioxomolybdenum(VI) complex is known for having high catalytic activity and selectivity toward product but difficult in separation as homogeneous catalyst. Therefore, complex modification into supporting material, like metal-organic framework (MOF) is developed to solve the separation problem. In this study, Cu-MOF-2 as supporting catalyst was constructed of copper(II) as inorganic cluster and benzene dicarboxylate as organic ligand. Cu-MOF-2 was synthesized by solvothermal, stirring and electrosynthesis methods to compare the most effective method. MOFs characterization used PXRD, FT-IR, TGA, and SEM. Incorporation of dioxomolybdenum(VI) complex into Cu-MOF-2 was done by addition of 4-aminopyridine (AMP) as the bridging ligand. The catalytic activity of Cu-MOF-2 was investigated on simple olefin compounds (allyl alcohol, 1-hexene, styrene) and long chain olefin compound (oleic acid). Cu-MOF-2 was employed in the epoxidation of simple olefin (1 mmol) and oleic acid (1 mmol) with condition TBHP 70% (1.5 mmol), CH₃CN 5 mL at 40−80°C for 2−6 h and TBHP 70% (1.5 mmol) at 60°C for 24 h without solvent and mineral acid, respectively. Epoxidation product was separated by centrifugation and analyzed by H-NMR (60 MHz) and GC.

Keywords: olefin, epoxidation, dioxomolybdenum(VI), Cu-MOF-2, catalyst


103

Topic: Chemistry

[ABS-192] The Properties of Microcellulose as Enhanced Oil Recovery Agent

Galuh Sukmarani*, Mia Ledyastuti

Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

The important factors in petroleum production are the nature of the reservoir rock surface and the interaction between oil and water in the reservoir. Both of these factors can affect microscopic efficiency in increasing oil recovery. In this study, microcrystalline cellulose (MCC) was tested as a potential agent to increase oil recovery. MCC is used to wettability alteration of reservoir rocks and decrease interfacial tension between oil and water. MCC is a micro cellulose with particle size ranging from 30 nm to 20μm. This study aims to determine the effect of MCC on rock wettability and interfacial tension between oil and water. MCC is obtained through the process of cellulose hydrolysis isolated from corncob. The results of hydrolysis reaction were characterized using FTIR, X-ray diffraction, and Scanning Electron Microscope (SEM). The particle size was determined using Particle Size Analyzer, changes in wettability were determined from contact angle measurements, and interfacial tension measurements. The results of the study obtained MCC as a result of hydrolysis reaction with an average diameter of 2.9 μm and 14 μm. The addition of MCC can reduce rock contact angle from 95.4° to 35.8° for MCC 2.9 μm and 39.8° for MCC 14 μm. The experimental results show that the addition of MCC can decrease interfacial tension between oil and water from 10.5 mN/m to 7.9 mN/m. From these data it can be concluded that MCC can change the nature of reservoir rock to be more water wet and can decrease interfacial tension between oil and water. MCC has the potential to be used as an economic and environmentally friendly oil recovery agent.

Keywords: Oil recovery, microcrystalline cellulose, particles size, wettability, interfacial tension


104

Topic: Chemistry

[ABS-232] Deoxygenation and Asymmetric Dihydroxylation of Benzyl-Protected

Robtein Chalcone in A Synthetic Route to (–)-Robidanol

Ari Rahmawan, Purwantiningsih Sugita, Luthfan Irfana, Tuti Wukirsari, Auliya Ilmiawati, Suharti, Budi Arifin*

Department of Chemistry, Bogor Agricultural University Kampus IPB Dramaga, Bogor 16680, Indonesia

*Corresponding author, tel: +62-85718605851, e-mail: [email protected]

Abstract

(–)-Robidanol is a tetrahydroxyflavan-3-ol that has been isolated from Indonesian merbau hardwood (Intsia palembanica). Several bioactivities have been reported as a skin-whitening, anti-acne, and antioxidant agent. In our previous work, a benzyl-protected robtein chalcone has been synthesized as an intermediate to (–)-robidanol. In this study, we further deoxygenated this chalcone following a Luche reduction procedure by using sodium borohydride and cerium(III) chloride as catalyst. The hydroxy group was protected as its tert-butyldimethylsilyl ether during this reduction. The deoxychalcone was then dihydroxylated following a Sharpless asymmetric dihydroxylation procedure to get (1S,2S)-3-[4-benzyloxy-2-hydroxyphenyl]-1-[3,4,5-tris(benzyloxy)phenyl] propane-1,2-diol. This vicinal diol was obtained with an overall yield of 9% from the protected robtein. Luche reduction is the crucial step which still needs further optimization. Based on the thin layer chromatography monitoring, some byproducts were also produced, which were difficult to be purified by column chromatography. These byproducts were predicted as resulted from partial reduction into alcohol and cyclization of the alcohol into flav-3-ene. Therefore, protection of the phenol group was carried out directly on the crude deoxygenation product. Cyclization of the diol by using a Mitsunobu procedure will be the next step to obtain (+)-epirobidanol, a C-3 epimer of (–)-robidanol.

Keywords: epirobidanol, Luche reduction, merbau


105

Topic: Chemistry

[ABS-233] In-Vitro Study of DNA Adduct 8-Hydroxy-2-Deoxiguanosine

Formation from 2’-Deoxyguanosine Exposure Against Benzo[a]pyrene and Ni (II) Compounds Through Fenton-Like Reactions

Ikko Haidar Farozy (a), Sri Handayani (a*), Budiawan (a), Intan Cahaya Dani (a)

a) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia

*[email protected]

Abstract

This research was performed to study the process of 8-OHdG adduct formation as biomarker that used for early cancer detection in humans. This in-vitro study was conducted by reacting 2’-deoxyguanosine as one of the bases of DNA against benzo[a]pyrene as xenobitics, Ni(II), and H2O2, to study the effects of 2’-deoxyguanosine exposure against xenobiotics through Fenton-Like reaction. The reaction was incubated at 37°C for 18 hours in a shaker incubator. The reactions were varied at pH 7.4 and 8.4. The reaction products were then analyzed by using reverse phase HPLC with UV-Vis detector. The mobile phase used was a mixture of phosphate buffer and methanol with composition of 90:10 It was observed that exposure of 2’-deoxyguanosine against benzo[a]pyrene and H2O2; and also benzo[a]pyrene, Ni(II), and H2O2 both produced 8-OHdG. The higher 8-OHdG yield is obtained from the exposure of 2’-deoxyguanosine against benzo[a]pyrene, Ni(II), and H2O2 compared to exposure against benzo[a]pyrene and H2O2, which can be attributed to stronger effects from Fenton-Like reaction. It was also observed that at similar exposure conditions, the 8-OHdG formation was higher at pH 7.4 compared to pH 8.4.

Keywords: 2’-deoxyguanosine; 8-OhdG; B[a]P; Ni (II); Fenton-like; DNA Adduct; Cancer Detection; Biomarker


106

Topic: Chemistry

[ABS-234] SYNTHESIS OF 3-PRENYLFLAVONE FROM PHENOL: STUDY OF LEWIS ACIDS IN FRIES REARRANGEMENT OF PHENYL

ACETATE

Budi Arifin (a*), Didin Mujahidin (b), Dian Septiani (a), Lia Anggraini (a), Indra Sugiarto (a), Muhamad Alif Hamimdal (a), Suharti (a), Suminar Setiati Achmadi (a), Luthfan Irfana (a)

a) Department of Chemistry, Bogor Agricultural University, Kampus IPB Dramaga, Bogor 16680, Indonesia

*[email protected] b) Department of Chemistry, Bandung Institute of Technology,

Jln. Ganesha No. 10, Bandung 40132, Indonesia

Abstract

Prenylated flavonoids are a unique class of naturally occurring flavonoids that show enhancement of bioactivities compared to their backbone flavonoids with non-prenylation. 3-Prenylflavones are a class of prenylated flavonoids having potent cytotoxicity, which are often found in plants from genus Artocarpus and Morus. In this study, 3-prenylflavone was synthesized in six steps from phenol. (1) Phenol was acetylated into phenyl acetate, and then (2) Fries rearrangement of this ester was studied by using different Lewis acids and reaction conditions. Reaction with aluminum chloride at 170°C for 3 hours gave the highest yield of o-hydroxyacetophenone (o-HAP) as the desired product. (3) Esterification of o-HAP with benzoyl chloride followed by (4) Baker-Venkataraman rearrangement of the benzoyl ester then produced 1-(2-hydroxyphenyl)-3-phenylpropane-1,3-dione. (5) Prenylation of this 1,3-diketone by using equimolar amounts of prenyl bromide and potassium carbonate resulted in an alpha-prenylated product. (6) Acid-cyclization of this product finally gave the 3-prenylflavone with an overall yield of 10% from phenol. All synthetic products have been characterized by spectroscopic analysis and from the melting point of solid products. Starting with different phenolic compounds and by using different acyl chlorides in the third step, a series of 3-prenylflavones can be synthesized in a combinatorial approach.

Keywords: Baker-Venkataraman; cytotoxicity; diketone; flavonoid; o-hydroxyacetophenone


107

Topic: Chemistry

[ABS-239] Dissolution Study of Purified Bromelain from Pineapple Core (Ananas comosus [L.] merr) Encapsulated in Alginate-Chitosan Microcapsule

Asher Reyhan, Siswati Setiasih, Sumi Hudiyono, and Endang Saepudin

Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Indonesia

Abstract

Along with the increasing production of processed pineapple, the resulting waste also increases. Pineapple waste is in the form of stems, leaves and parts of the pineapple core. Pineapple core can be used as a potential source of bromelain. Bromelain has many benefits, especially because of its efficacy in various treatment of diseases, including as an anti-aggregation agent and reducing inflammation. However, for oral use bromelain will be hydrolyzed by the presence of protease enzymes and the acidic pH condition in the stomach, so bromelain will loss of activity. In this study, the isolated and purified bromelain from pineapple cobs was subsequently encapsulated in alginate-chitosan microcapsules as drug delivery medium so that bromelain could reach the intestine without degradation in the stomach. The purification using 20-50% ammonium sulphate obtained bromelain with specific activity of 5.4358 U/mg and purity of 2.8 times. The purified enzyme was subsequently dialyzed and yielded of 8.2726 U/mg with the purity level of 4.3 times. The dissolution test of bromelain encapsulated in alginate microcapsules resulted in efficiency of 76.99% which dissoluted at pH 1.2 as much as 13.53% and at pH 7.4 of 80.09%, while in chitosan-coated alginate microcapsules, efficiency was obtained for 86,40% with dissolution result at pH 1.2 and 7,4 were 8,59% and 77,35% respectively.

Keywords: alginate, bromelain, dissolution, mikrocapsule, purification


108

Topic: Chemistry

[ABS-252] Microwave Assisted Amidation of 5-Amino-isophthalic acid dimethyl

ester Catalyzed by Imidazolium based Ionic Liquids

Anita Alni, Allysa Pratiwi Putri

Division of Organic Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Abstract

Amide functionalities present in living system as peptides and posses various biological role. Many synthetic amides also posses biological activities due to the possibility of interaction with cellular liquids such as those compounds useful as contrast agent in radiographic method. Synthesis of amides from the carboxilyc acid or derivatives normally require heating and catalyst. In this report, an enviromentally benign synthesis of amide was carried out utilizing microwave radiation and catalyzed by imidazolium ionic liquids. Microwave radiation provided efficient heating through activation of chemical bonds instead of convensional conductivities methods hence increasing rate of the synthesis. Ionic liquids were suitable material in this synthesis due to non-volatile nature as well as stability under high temperature and microwave heating. Furthermore, ionic liquids are tunable material that can be design for the specific synthesis and funtioned as catalyst. The optimum condition for coupling of 5-Amino-isophthalic acid dimethyl ester with an amino diol was found at 80°C, 90 minutes, under radiation of microwave at the power of 300 Watt. The product was obtained at 38.46% yield and characterized using spectroscopic method namely 1H NMR. Furthermore, the methodology was applied to precursor synthesis of radiographic material and was successful to obtain product with 48.78% yield. The product was characterized using 1H NMR spectroscopy.

Keywords: Amidation, ionic liquids, imidazolium, maos


109

Topic: Computational science

[ABS-1] Staggered Scheme for Shallow Water Equations with Quadtree-subgrid

F. Fristella, S.R. Pudjaprasetya


Abstract

High-resolution numerical simulations are often required to obtain accurate results, which means that a relatively long computation time. One way to get an effective scheme in terms of computational time is to adopt a scheme that can handle computing domains with different resolutions. In this work, a two-level quadtree-subgrid method is applied, which uses a combination size of grids (structured grids) with hierarchical quadtree ordering. This method is applied on a staggered grid scheme for the two-dimensional shallow water equations. Simulation of wave run-up on a conical island as the experimental benchmark test is presented as a validation. Comparison between computing time of the fine grid simulation and the quadtree-subgrid simulation shows the effectiveness of this quadtree-subgrid scheme.

Keywords: Shallow water equation, staggered scheme, quadtree-subgrid, conical island


110


[ABS-269] An Artificial Neural Network Approach in Predicting Career Track of

Incoming Senior High School Students

Allen L. Nazareno (a*), Marie Joy F. Lopez (b), Geleena A. Gestiada (a), Marisol P. Martinez (a), Ranzivelle Marianne Roxas-Villanueva (a)

a) Institute of Mathematical Sciences and Physics, College of Arts of Sciences, University of the Philippines Los Baños

b) Institute of Statistics, College of Arts of Sciences, University of the Philippines Los Baños

*[email protected]

Abstract

The K to 12 program has been recently implemented in the Philippines by the Department of Education which implicated an additional two years in the student’s basic education. These ancillary years allow senior high school students to take courses under the core curriculum and the track of choice. There are seven major tracks available for the senior high school, namely Accountancy, Business, and Management (ABM), Science, Technology, Engineering, and Mathematics (STEM), Humanities and Social Science (HUMSS), General Academic Strand (GAS), Arts and Design, Sports and Technical-Vocational-Livelihood (TVL). Each student must select one track to pursue that can equip him/her with skills to prepare for the future.

Prediction of choice of career track in senior high school is advantageous for educational institutions since it gives insights that can help them develop vital programs beneficial for student’s learning in school. In this study, we applied artificial neural network to predict the career track of a student based on his/her grades in five major subjects. Artificial neural network (ANN) is a type of machine learning algorithm that has been applied to various disciplines; e.g. education. Different ANN models have been considered and compared. In training and testing the models, a sample of 293 student data information was used. The highest accuracy recorded among all the models was 74.1%.

Keywords: Artificial Neural Network, Prediction, Career Track, K to 12 program


111


[ABS-25] E-SIBAYU: A Tele-Monitoring App for Saving Pregnant Mothers and

Babies

Mohammad Yani, Eka Ismantohadi, Darsih

Politeknik Negeri Indramayu

Abstract

During last six years, Indramayu had a high number of maternal and baby deaths. Even in 2016, Indramayu was as a third rank in number of maternal and baby deaths in West Java. The main cause of this problem was that there was no system to monitor the most causes of the maternal and baby deaths. Public health office could not plan what they should do because they did not have enough information about the real circumstance of pregnant mothers during their pregnancy. For consequence, public health office could not prepare well both the first and advance aid for the pregnant mothers who had a high risk for their health. That is why we propose a system that can provide features to monitor the progress of pregnant mothers especially in terms of four main causes involving the maternal and baby deaths happened, called E-SIBAYU. E-SIBAYU is developed for both mobile and web based. The mobile based app is used by midwifes to entry the health information of pregnant mothers, while the web based app is used by public health officers to monitor all health information of pregnant mothers. The information is not only stored in cloud but also can be visualized in graphs and charts. E-SIBAYU has been used by public health office of Indramayu since 2017, and it has shown a positive impact on the decrease of number of maternal and baby deaths in that year. This paper presents the design and implementation of a tele-monitoring app for saving pregnant mother and babies called E-SIBAYU. This work is an initial work of future work to develop a wearable health device that will be able to measure the blood pressure of pregnant mothers in real-time where the future device will be possible to be mass produced to support industry of e-Health technology implementation.

Keywords: E-Health; Pregnancy monitoring; Tele-Monitoring; Health monitoring


112


[ABS-27] New Lagrange-Galerkin Scheme for Solving Fluid Flow in Non-

homogeneous Porous Medium

I.Wijaya, M.Kimura, H.Notsu

Kanazawa University

Abstract

Fluid flow in a porous medium is an essential topic in various applications, such as petroleum and geothermal engineering. The governing equation of Navier-Stokes with the porous medium based on the method of volume averaging of the velocity and pressure deviations in the pore is well established in previous work. Solving those equations directly using Lagrange-Galerkin scheme is awkward due to the existence of a non-homogeneous porous medium. The purpose of this work is to develop a new numerical scheme based on the Lagrange-Galerkin scheme to solve the fluid flow in the non-homogeneous porous medium. In this work, a numerical experiment was conducted to investigate the performance of the scheme. From the numerical experiment, the second order convergence is obtained by this scheme.

Keywords: Lagrange-Galerkin scheme, non-homogeneous porous medium, Navier-Stokes equation


113


[ABS-37] Physical Parameters and Atmospheric Model of Alpha Tau at AGB

Evolutionary Stage

Rendy Darma (a*), Hakim Luthfi Malasan (b,c)

a) Graduate program in Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia

*[email protected] b) Astronomy Division and Bosscha Observatory, Faculty of Mathematics and Natural Sciences,

Institut Teknologi Bandung, Bandung, Indonesia c) ITERA Astronomical Observatory, Institut Teknologi Sumatera, Bandar Lampung, Indonesia

Abstract

𝛼𝛼-Tau is an interesting Red Giant Branch (RGB) star with spectral type K5, yet not well studied. Helium core contraction and hydrogen burning in the shell are occurring in this star. Stars like 𝛼𝛼-Tau are interested to be investigated in order to learn and understand how their evolution processes at the next stage i.e. Asymptotic Giant Branch (AGB) stage. At AGB stage, a star will suffered from stronger oscillation and with larger radius than RGB stage. This stage is important because it will be the key-factor of the final stage of that star. In this research, we use most updated physical input based on most recent observational data, and Modules for Experiments in Stellar Astrophysics (MESA) and SPECTRUM packages to compute accurate physical parameters and atmospheric models of 𝛼𝛼-Tau at AGB stage.

Our computational results show that 𝛼𝛼-Tau will be an AGB star with M = (1.52 ± 0.07) M⊙, T𝑒𝑒𝑒𝑒𝑒𝑒 = (4545 ± 18) K, and log L = (1.98 ± 0.07) L⊙ at age (2.11 ± 0.27) Gyr. Its radius at this stage is determined to be log R = (1.20 ± 0.92) R⊙. Mass loss at the initial of this stage is still small i.e. (2.07 ± 0.09) × 1010 Msun/yr and it will increase during this stage. The core at this stage contains carbon and oxygen with C/O ∼ 0.26 which shows that 𝛼𝛼-Tau will be type M AGB. Atmospheric model of 𝛼𝛼-Tau at AGB stage shows that this star will have higher effective temperature and gas pressure than at RGB stage. These conditions will cause the increasing electron density and Rosseland absorption coefficient in its atmosphere. The hotter atmosphere at AGB stage causes its peak of continuum shifts toward smaller wavelength and yields in three times higher intensity than at RGB stage.

Keywords: Alpha Tau, AGB stage, physical parameters, atmospheric model


114


[ABS-64] Handwritten Mathematics Symbol Recognition Using Multi Kernel

Support Vector Machine

Muhammad Athoillah

Mathematics Education Department, Adi Buana Surabaya University, Jl. Ngagel Dadi III-3B, Wonokromo, Surabaya, 60234

Abstract

Handwritten recognition is how computer can identify a handwritten character or letter from a document, an image or another source. recently, many devices provide a feature using handwritten as an input such as laptops, smartphones, TV, and others, affecting handwritten recognition abilities become important thing. Basically handwritten recognition problem is part of classification problem and has many algorithms that can be used to solve this problem. One of them is Support Vector Machine (SVM). By finding a best separate line and two other support lines between input space data in process of training, SVM can provide the better result than other classify algorithm. Although SVM can solve the classify problem well but SVM can only be used for linear separable data, meanwhile SVM must be modified with kernel learning method to be able to classify nonlinear data. However, determining the best kernel for every classification problem is quite difficult, this is because every data that use for each problem has its own characteristic. Therefore, some technique have been developed by researcher to solve that difficulties, one of them is Multi Kernel Learning (MKL). This technique works by combining some kernel function to be one kernel with an equation. This framework built an application to recognize handwritten mathematics symbol that input from image using SVM algorithm that modified with Kernel Learning Method. The result shows that the application can recognize the image data well with average value of Precision 76%, Recall 65% and Accuracy 86%

Keywords: Handwritten; Classification; Image Recognition; Multi Kernel Learning; Support Vector Machine


115


[ABS-133] Stochastic Simulation of Yeast Cells and Its Colony Growth by Using

Circular Granular Model for Cases of Growth and Birth Probabilities Depends on Position

Dimas Praja Purwa Aji, Devi Aprianti, Sparisoma Viridi


Abstract

Until now, many studies were conducted on microorganisms in order to make the best use of them and prevent the loss. As a type of microorganism that is widely utilized by humans, the yeast has a simple single cell structure that can represent many other complex cell processes and generally has almost elliptical shapes making it easier to model for further investigation. In this study, we model yeast cells with two dimensional circular granular particles and the interaction between them are modeled by the force of gravity, normal force, and Stoke’s force. The growth and birth factor of yeast cells are modeled stochastic with the simulation is done by using javascript programming language.

From the simulation results obtained, showing the growth of yeast cells in the colony has a behavior that is in accordance with the theory, which grows exponentially, as well as the growth of the size of the colony radius whose growth rate is inversely proportional to the rate of growth of its number of cells.

Keywords: Granular Particle, Simulation, Stochastic, Yeast


116


[ABS-137] Network Analysis of Saccharomyces Cerevisiae Colony: Relation

between Spatial Position and Generation

Widya Meiriska(a*), Florentin A. P.(a), Dimas P. P. A.(b), Devi Aprianti(b), Sparisoma Viridi(a)

a) Department of Physics, b) Department of Computational Science Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Jalan Ganesha 10, Bandung 40132, Indonesia *[email protected]

Abstract

The organizations of particles in granular materials have complex organizations on a spatial scale. Such organizations may affect how materials respond or reconfigure when exposed to external interference or loading. Particles have been studied in theoretical and require the development and application of appropriate mathematical, statistical, physical and computational frameworks. Usually, granular materials have been explored using particles or circuit models that are implicit. Today the development of network science has emerged as a powerful approach to investigate and characterize heterogeneous architecture in complex systems and diverse methods have yielded interesting insights into granular materials. In this study will learn granular materials with the network-based approach and explore the potential of these frames to provide a useful description of these granular materials. As well as to improve understanding of the underlying physics.

Keywords: Granular; Network Analysis


117


[ABS-152] Traffic Flow Simulation using Agent-Based Model

Sparisoma Viridi (a*), Melyana Dwitasari (b), Mahardika Takaendengan (b), Kurnia Novita Sari (c), Udjianna Sekteria Pasaribu (c)

a) Department of Physics, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Master Program in Computational Science, Institut Teknologi Bandung,

Jalan Ganesha 10, Bandung 40132, Indonesia c) Department of Mathematics, Institut Teknologi Bandung,

Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Vehicle is modeled as a point, which is moving along a closed trajectory. A small amount of time is defined as the time step, the smallest time difference, so that any time measurement is simply multiple of this value. Lowest positive velocity (but greater than zero) is where in the time step a vehicle advances its position for only a spatial step. Higher velocities and also the negative ones can be constructed from this value. A single lane and multiple ones are investigated in this work, where a vehicle can change its lane based on passing-and-safety algoritm. In this algorithm it must calculate that by changing lane it can speed up and also avoid collision with existing vehicle in destination lane. It will remain in current line when some threshold value can not be surpassed. As pertubation several traffice lights are also installed in the trajectory. It is observed that density distribution evolves after the traffic lights change their states. For constant state the distribution tends to have a unique form.

Keywords: simulation, traffic flow, agent-based model, statistical physics, discrete system


118


[ABS-204] Change in Falling velocity of Natural Sand to Mass and Size Variations

Roni Stiawan, Siti Nurul Khotimah, Sparisoma Viridi

Department of Physics, Institut Teknologi Bandung

Abstract

The color of sand on the beach has a big influence on tourists interest. Beaches with bright sand colors like white and golden yellow are preferred by tourists compared to sand with dark colors. This is because sand can affect the appearance of sea water in shallow areas. Brightly colored sand can better light so that the sea water above it looks clearer. To increase the tourist attraction of the beach with dark sand, one effort that can be done is to add a layer of brightly colored sand on it. However, the sand at the bottom of the beach can be disturbed by sea waves and human activities, so that the sand can be lifted and subject to suspension. When experiencing suspension, the grains of sand will move down because of the gravitational force at a certain speed. The speed of this grain depends on several physical factors such as density, diameter, inhibition coefficient and medium viscosity. Various studies have been carried out by scientists to predict the movements of falling grains, but there is no right solution. Velocity equations of falling grain has also been proposed by many researchers, but these equations are very difficult to apply. This study aims to determine how the grain fall velocity changes with respect to grain mass, size, and roundness variation. Based on the results that have been obtained, it can be concluded that the mass, size, and roundness of the granules are the most influential factors in the falling velocity.

Keywords: falling velocity , mass, cross section, roundness


119

Topic: Earth and space science

[ABS-256] Morphodynamic and hydrodynamic conditions which controlled

Quartz Detritals and Heavyminerals deposites on Senunu Canyon, Sumbawa, Indonesia

Yunia Witasari

Research Center for Oceanography, Indonesian Institute of Science, Jl. Pasir Putih 1, Jakarta 14430

Abstract

In order to characterize the Quartz detritals of the sea bottom sediment Senunu Canyon Sumbawa and to determine the influence of morphodynamic and hydrodynamic conditions in this area, a comprehensive sedimentological investigation was combined with detailed geochemical analyses. Lithological composition and grain size are mainly controlled by the input from two different sources: the submarine continental slope and mainland. Further, the distribution of these sediments is largely influenced by hydrodynamic conditions and redeposition processes. The slope is characterized by redeposited sediments of various grain sizes. Sediment chemical analyses show element distribution patterns that are strongly correlated with the ratio of magmatic, volcanic and detritic particle composition. This ratio reflects particle input and distribution processes. Two element associations are elements coupled with (1) slope-derived volcanic particles and (2) the detrital which reflects gravity flow from mainland.

Keywords: Quartz, morphodynamics, hydrodynamics, heavyminerals, Sumbawa Indonesia


120


[ABS-2] The Data of Sky Brightness Observation of Depok City from March

2017 to February 2018 Using Sky Quality Meter (SQM)

Adi Damanhuri (a*)(b)

a) Universitas Muhammadiyah Prof DR HAMKA *[email protected]

b) The Islamic Science Research Network

Abstract

The sky brightness measurements were performed using Sky Quality Meter as portable photometer pocket size with output directly in magnitudes per arc second square (mass). Observation with 3 seconds temporal resolution was recorded at Depok city (106°45’E;6°23’S) from March 15th 2017 to February 18th 2018 within 174 data and I use only the maximum mass. It shows the range between 12 – 20 mass, the average is 16.7 mass with standard deviation 1.4 mass. According Bortle scale, Depok city is in inner city or the ninth scale.

Keywords: Sky Quality Meter, Bortle Scale, photometer, Depok


121


[ABS-21] A Search of Diffuse Insterstellar Bands in Planetary Nebulae

Environment

Evaria Puspitaningrum(1), Hakim L. Malasan(2), Lucky Puspitarini(2)

1) Pascasarjana Program Studi Astronomi, FMIPA Institut Teknologi Bandung, Jalan Ganesha 10 Bandung 40132 Indonesia

2) Program Studi Astronomi dan Observatorium Bosscha, FMIPA Institut Teknologi Bandung, Jalan Ganesha 10 Bandung 40132 Indonesia

Abstract

Diffuse Interstellar Bands (DIBs) are set of absorption features, mostly at optical and near infrared wavelengths, that are found in the spectra of reddened stars and other objects. DIBs are actively being investigated to understand the nature of its properties and carriers and also its role in interstellar matter enrichment. Among of the proposed carriers are large carbonaceous molecules (fullerenes). Interestingly, such as C60 and C70 have been detected in Planetary Nebulae (PN) environment. This detection allows us to study DIBs in fullerene-rich space environment. In this work, we study the presence of DIBs in Hen2-47 and Hen2-107 planetary nebulae by using archival data of optical spectra observed with 8.1-m Gemini South Telescope and Gemini Multi-Object Spectrographs GMOS (spectral range of 3900 Å - 5900 Å and resolution of R ~ 2300). We investigate DIBs in the spectra of neighboring field stars of the planetary nebulae to see if they relate to foreground interstellar matter or circumstellar of the planetary nebulae. We also discuss plausible physical relation between stellar evolution phase and its surrounding.

Keywords: Diffuse Interstellar Bands


122


[ABS-39] Modelling Brazil Nut Effect Phenomenon of Boulders on Asteroid

Surface

Achmad Zainur Rozzykin (a*), Budi Dermawan (b), Sparisoma Viridi (c)

a) (Under)-Graduate Program in Astronomy, Faculty of Mathematics and Natural Sciences, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Astronomy Research Division and Bosscha Observatory, Faculty of Mathematics

and Natural Sciences, Jalan Ganesha 10, Bandung 40132, Indonesia c) Nuclear Physics and Biophysics Research Division, Faculty of Mathematics and Natural

Sciences, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Surface of an asteroid is full of boulders that varies in size. One of the phenomenon happening in the asteroid’s surface is a tendency for bigger boulders to come up to the surface. This phenomenon is called Brazil Nut Effect (BNE). Some asteroids, like Itokawa and Eros, are known for having that tendency and BNE is supposed to happen in both of them. This study conducts a modelling of the phenomenon happening on the surface of an asteroid for mimicking the concept of BNE. Physical parameters used in this study follow a model of common asteroid. The very first step of the modelling is generating an initial condition of particles. Then, these particles are dropped into the surface of an asteroid model. After these particles reached the dynamical relaxation, additional force will be added into the system which is represented by some sinusoidal oscillation formulas. Modelling the concept of BNE which only involves collisions of inter-particles and gravity factor indicates that the rising of bigger boulders to come up to the surface is possible to occur. Nevertheless, there are many other parameters that have a role in low-gravity environment and need to be explored more.

Keywords: Brazil Nut Effect; modelling; asteroid surface; granular particles


123


[ABS-40] Possibility of C/2002 CE10 in State of Retrograde-Polar Resonance with

Saturn in the Future

Ayu Dyah Pangestu (a*), Budi Dermawan (a, b)

a) (Under)-Graduate Program in Astronomy, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Astronomy Research Division and Bosscha Observatory, Faculty of Mathematics and Natural

Sciences, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Many objects in the Solar System which are associated or in resonance state with the giant planets have low orbital inclination. The effect of resonance that occurs on high-inclination objects is not well-known. This study describes results of numerical studies in term of orbital evolution of a high inclination Halley-Type Comet C/2002 CE10 (LINEAR). The ephemeris data was taken from JPL Small Body Database (https://ssd.jpl.nasa.gov/sbdh_query.cgix) at the epoch of MJD 58200. We report that C/2002 CE10 (LINEAR), whose inclination is 145o, will be in a retrograde 1:-1 (co-orbital - trisectrix type) resonance with Saturn for about 600 thousand years in the future. This resonance state is examined using the method FAIR (Fast Identification of Mean Motion Resonance). C/2002 CE10 (LINEAR) exhibits chaotic orbits and may not be stable in the resonance state. While data quality of the provided orbital elements is not quite high, orbital evolutions of clones of C/2002 CE10 (LINEAR) show small possibility that the object will be in the resonance state (retrograde co-orbital) with Saturn in the future.

Keywords: C/2002 CE10; retrograde-polar resonance; co-orbital; FAIR Method


124


[ABS-296] EXOPLANETS’ SEMIMAJOR AXIS PREDICTION USING

HARMONIC ORBIT RESONANCE MODEL

JUDHISTIRA ARIA UTAMA(1), FERRY MUKHARRADI SIMATUPANG(2), POPI SITI PATIMAH(1)

(1) DEPARTEMEN PENDIDIKAN FISIKA, FPMIPA, UNIVERSITAS PENDIDIKAN INDONESIA

(2) KK ASTRONOMI, FMIPA, INSTITUT TEKNOLOGI BANDUNG

Abstract

As of November 2017, there were 3504 confirmed exoplanets. Of these numbers there are 515 planetary systems with a single parent star. In this work we apply the latest model, harmonic orbit resonance, to predict the distance of 1,289 planets from their respective parent stars based on the ratio of the harmonic periods between the two neighboring planets that appear most frequently, namely (5: 1), (2: 1), (5: 3), (3: 2), (5: 2), (5: 4), (4: 3), (4: 1), and (3: 1). We found that the prediction of the distance of the exoplanets from their respective parent star compared to the observed distance is generally better for planetary systems with parent stars similar to the Sun. With this model we also predict the position of exoplanets that are lost or not observed yet in each planetary system and how many planets are residing in habitable zone.

Keywords: exoplanet, exoplanetary system, habitable zone, harmonic orbit resonance, solar system


125


[ABS-42] A Search for Extragalactic Diffuse Interstellar Bands

Lucky Puspitarini (a*), Premana W. Premadi (a), Taufiq Hidayat (a), Mahasena Putra (a), Matthew Colless (b)

a) Astronomy Study Program and Bosscha Observatory, FMIPA Institut Teknologi Bandung Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Research School of Astronomy & Astrophysics, The Australian National University, Canberra,

ACT, Australia

Abstract

Diffuse interstellar bands (DIBs) are puzzling absorption features that can be found in the spectra of reddened objects in our Galaxy as well as in other observed galaxies. Although we do not know utterly the carriers of DIBs, except for several near-infrared ones, the numerous features along the optical and near infrared wavelengths and the consistency of their measured properties make DIBs potentially promising interstellar material tracers. DIBs studies are mostly based on stellar spectra in our Galaxy, but since DIBs can also be found in other galaxies, we search for DIBs in the spectra of nearby galaxies by perusing Sydney-AAO Multi-object Integral-field unit (SAMI) data. We measure selected DIBs by performing a fitting of a combination of a smooth continuum and a model of DIB profile to the spectrum. Each resulting DIB measurement is then compared to the general DIB-extinction relationship. This will be an input in drawing general overarching conclusion about DIBs and their environments.

Keywords: interstellar matter; diffuse interstellar bands; spectroscopy; extragalaxy


126


[ABS-298] Tracing Galactic Arm by Using Diffuse Interstellar Bands and Gaia

DR2

Lucky Puspitarini (a*), Rosine Lallement (b)

a) Department of Astronomy and Bosscha Observatory, FMIPA Institut Teknologi Bandung, Jalan Ganesha 10 Bandung 40132 Indonesia

*email: [email protected] b) GEPI, Observatoire de Paris, CNRS UMR8111, Université Paris Diderot,

Place Jules Janssen, 92190, Meudon, France

Abstract

Diffuse interstellar bands (DIBs) are mysterious weak interstellar absorption features detected in the optical and infrared. Although we do not know utterly the carriers of DIBs, except for the two near infrared DIBs, they can be a promising interstellar medium (ISM) tracer. In this work, we apply DIB fitting that is a combination of a synthetic stellar spectrum, a synthetic telluric transmission, and empirical DIB profile to fit and to measure DIB’s equivalent width. Based on DIB measurements from stellar spectra of distributed target stars and together with Gaia DR2, we investigate the ISM distribution along particular line of sight, i.e., (l,b)=(213, -2), and we locate Local and Perseus Arm.

Keywords: Diffuse Interstellar Bands, ISM, Gaia, Parallaxes, Galactic Arm


127


[ABS-44] Effect of Magnetic Field on the Rotation Curves of Spiral Galaxies

Wulandari (a*), Hesti Retno Tri Wulandari (b)

a) Graduate Program in Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Astronomy Study Program, Faculty of Mathematics and Natural Sciences, Institut Teknologi

Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Discrepancies between expected and observed rotation curves in spiral galaxies are commonly interpreted as an evidence for the existence of dark matter. The existence of dark matter can explain the flat rotation curves observed in the outer radii. However, some rotation curves of spiral galaxies exhibit rising features at large distance from the galactic center. The spiral galaxies’ components such as disk, gas, bulge, and dark matter halo are not sufficient to accomodate that feature. The addition of magnetic field contribution to the rotation curve of spiral galaxies is proposed in some literature to explain the rising feature.

In this work we reviewed rotation curve data of four spiral galaxies, i.e. NGC 2841, NGC 6946, and NGC 7331 in SPARC catalogue obtained by Spitzer in 3.6 micrometer and M31 in Chemin et al. (2009), whose profiles of azimuthal magnetic field are available. Our model of rotation curves consist of contributions from four components (stellar disk, gas, bulge, and dark matter halo) and an additional contribution from the magnetic field.

In general decomposition scenarios using four components with magnetic field result in the better fitting with the observational data. Setting the contribution of magnetic field free in the rotation curve fitting gives better results in term of the reduced chi square, in such case the rotation speed values ranging from 50 – 100 km/s. Whereas, fitting with contribution from a fixed magnetic field profile provides values less than 10 km/s. However, according to Sánchez-Salcedo et al. (2014), large magnetic fields will give a too large vertical force that can break gas in the field of galaxies. If this is true, then the fittings with the second decomposition scenario are considered to be more reasonable physically, moreover the difference of the reduced chi-square values between the two scenarios are not huge.

Keywords: Rotation curve; Spiral galaxy; Decomposition; Magnetic field


128


[ABS-310] Expansion Velocity of Selected Planetary Nebulae from MASH Data

Archive

Evan I. Akbar

Department of Astronomy and Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia

evan[at]as.itb.ac.id

Abstract

Planetary nebula is an exotic object consists of an expanding shell of ionized gas and dust ejected from its central star at the late stage evolution of intermediate mass star. Usually, the expanding nebula is observed as double peaked emission lines as one of its shell is blueshifted while the other is redshifted. The expansion velocity is measured from the peak to peak separation of emission lines. For compact planetary nebulae, most of their emission lines are single peak and the expansion velocities are determined by applying Gaussian decomposition. This paper presents expansion velocity of selected planetary nebulae from The Macquarie/AAO/Strasbourg Hα Planetary Galactic Catalog (MASH) spectral data archive. Following the work of Gurzadyan and Egikyan (1991), relation between mean excitation velocity derived from [OIII] lines and the excitation class of nebula are discussed. Complete measurement will be published on another paper (in preparation).

Keywords: expansion velocity; planetary nebula; MASH


129


[ABS-311] Abundances and Excitation Class of Selected Planetary Nebulae from

MASH Data Archive

Evan I. Akbar

Department of Astronomy and Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia

evan[at]as.itb.ac.id

Abstract

Abundance of planetary nebulae is an important tools to probe the physical parameter of their central stars (i.e. temperature, mass, and distance) and to study chemical evolution of the Galaxy. This paper presents abundances of selected planetary nebulae from The Macquarie/AAO/Strasbourg Hα Planetary Galactic Catalog (MASH) spectral data archive. The chemical abundances are measured from the intensity of emission lines, mostly from hydrogen, HeII, and forbidden lines. Excitation class and temperature of central star are determined for some planetary nebulae. Complete measurement and further analysis will be published on another paper (in preparation).

Keywords: abundance; excitation class; planetary nebula; MASH


130


[ABS-314] Reports on Sky Brightness, Seeing, and Weather Measurement at

Timau Observatory, East Nusa Tenggara

Evan I. Akbar (a*), Agus Triono P. Jatmiko (b), Mahasena Putra (a,b), M. Zamzam Nurzaman (c), E. Sungging Mumpuni (c), Denny Mandey (b), Moedji Raharto (a,b)

a) Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia

b) Bosscha Observatory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Lembang, 40391, Indonesia

c) National Institute of Aeronautics and Space, Junjunan 133, Bandung 40173, Indonesia *evan[at]as.itb.ac.id

Abstract

In 2015, a joint collaboration project to build a new observatory in Mount Timau, East Nusa Tenggara was initiated between LAPAN, ITB, UNDANA, Kupang Regency and East Nusa Tenggara governments. The site selection is based on initial studies of cloud cover over Indonesia on 1996-2010 (Hidayat et al., 2012), sky brightness on July 6, 2013 (Irfan et al., 2013), and seeing measurements on September 2007 (Dermawan et al., 2010), 7-8 May; 26 October 2013 (Putra et al., 2013). This paper presents seeing, weather and sky brightness measurements obtained on July 2018 using Differential Image Motion Monitor (DIMM) with 20 cm-telescope, Davis Vantage Vue automatic weather station, and Sky Quality Meter, respectively. Sample data taken on nearby location (Amfoang Tengah District, 124 00 04" East and 09 40 28" South, 1071 m dpl) on 26 August-6 September 2017 also presented as comparison.

Keywords: site testing; observatory


131


[ABS-67] Lyman Alpha Forest in Lensed Quasar Spectra

Premana W. Premadi and Anton T. Jaelani

Bosscha Observatory, Institut Teknologi Bandung

Abstract

The large scale structure of the universe is built of massive clumps of matter in form of galaxies and clusters of galaxies, as well as smaller yet more smoothly distributed clouds of cold neutral hydrogen. The latter is observed indirectly in the absorption features of background quasars. This paper report on the statistics of lensed quasars whose spectra shows feature of Lyman alpha absorption. It will shed a new light on how large massive structure, in this case the lens galaxies, might correlate with the hydrogen clouds along the lens optical axis.

Keywords: Cosmology; extragalaxy


132


[ABS-75] Rapid Orbital Plane Oscillation of Retrograde Near-Earth Asteroid

2009 HC82

Budi Dermawan (a*)

a) Astronomy Research Division and Bosscha Observatory, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Asteroid 2009 HC82 has been known as a retrograde asteroid in near-Earth region. Although orbit of the asteroid is located in 3:1 mean-motion resonance with Jupiter at about 2.5 au, its life time at the resonance has been predicted to be longer, i.e. several million years. Here we report dynamical study of the asteroid for a million year with including gravitational perturbations of all planets. All of the perturbations maintain an eccentric orbit of the asteroid, and interestingly, its orbital plane oscillates rapidly in just some thousand years. It is not known whether these orbital characteristics are common for such class of object because of a very limited sample.

Keywords: Asteroid 2009 HC82; Retrograde orbit; Asteroid dynamics


133


[ABS-84] Analysis of Tortuosity and Percolation Probability on 3 Dimensional

Rock Models with Different Model Sizes

Fajar Wimar Ramadhan (a), Umar Fauzi (b)

Physics of Earth and Complex Systems, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Bandung, Jawa Barat, Indonesia.

E-mail: a) [email protected], b) [email protected]

Abstract

Tortuosity, percolation probability and porosity are important rock parameters because they affect the fluid flow in rocks. In this study, 3-dimensional cube-shaped rock models were randomly generated with N × N × N size containing matrices and pores. Rock models were made with porosities ranging from 0.1 to 1 with a rise of 0.1 with the size N = 5, 6, 7, 8, 9, 10, 11, 12, 25, 125 and randomized as many as 10,000 configurations for each porosity value. Then, tortuosity was calculated using the nearest-neighbor sites method with 6 neighboring sides closest that can be a choice of tortuosity path. Moreover besides, with the site percolation model, percolation probability was calculated by determining the comparison between the number of percolate configurations and the total number of configurations created. The results show that in large-size rock models, the average tortuosity will increase. Further, the percolation probability value is zero at a small porosity and rises to 1 as the porosity increases. In addition, the slope of the percolation probability curve will increase for the larger model. In other words, the larger the size of the model, the percolation threshold will become larger or more difficult to percolate for small porosity.

Keywords: 3D rock model, percolation probability, percolation threshold, porosity, tortuosity


134


[ABS-87] SHEAR WAVE VELOCITY ANALYSIS OF 2-D MULTICHANNEL

ANALYSIS OF SURFACE WAVE (MASW) TO INVESTIGATE SUBSURFACE FAULT OF ALTERNATIVE BRIDGE

CONSTRUCTION IN KELOK SAGO JAMBI

Muhammad Farras Farhan dan Gunawan Handayani

Earth Physics and Complex System Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganeca no. 10, Bandung 40132, Indonesia

Abstract

Abstract. Every geotechnical measurement requires geophysical methods to classify soil types under the ground. S-wave velocity (Vs), P-wave velocity (Vp), and density (ρ), are the most important parameters in the classification of soil types. There are various methods to identify Vs, one of them is P-S logging method. However, this method is less suitable to be applied in urban areas due to the difficulties of data acquisition and high expense in operational costs. In 1999, a seismic method using surface waves to determine Vs profile with a higher signal to noise ratio was introduced by the name of Multichannel Analysis of Surface Waves (MASW). A surface wave, especially Rayleigh wave, creeps very slowly on the surface with larger amplitude than a body wave. It causes the energy of surface wave to be the strongest one. The propagation of the surface wave will disperse frequencies of the wave based their phase velocities. MASW 2-D method is used in this paper to determine subsoil properties and to identify the fault under the bridge abutments plan (abutment 1 and abutment 2) in Kelok Sago Jambi. The main advantage is the ability to recognize the pattern built from different paths of seismic surface waves which create common midpoint propagations, so that the pattern image can be used and analyzed as a whole group at once.

Keywords: geophone sensor, MASW method, Rayleigh wave, s-wave velocity, fault detection


135


[ABS-88] Photmetric Observation of WASP-52 b and TrES-3 b

M. Yusuf, D. Mandey, Y. Yulianty

Bosscha Observatory

Abstract

We present the photometric observation of transiting exoplanets WASP-52 b and TrES-3 b using Bosscha Robotic Telescope. The transit method relies on measuring the flux drops of the target star when the planet is transiting in front of it. We have derived physical parameters of these planets using single transit lightcurve and the results are consistent with the discovery paper which uses more observation data.

Keywords: photometry, exoplanet


136


[ABS-97] Model Parameter Determination of Magnetotelluric (MT) Data Using

Non-Dominated Sorting Genetic Algorithm II (NSGA-II)

Irwansyah Ramadhani(*), Sungkono, Bagus J. Santosa

Department of Physics, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia.

*[email protected]

Abstract

Magnetotelluric (MT) method is applied widely in exploration and environmental studies to estimate electrical property (resistivity or conductivity) of subsurface. This parameter can be obtained by inversion of MT data which consists of apparent resistivity and phase data as periods function. Inversion of MT data is nonlinear and multi-objective problems which minimizes two objective functions, i.e. misfit between observed and calculated of each MT data. In this research, these problems are solved by nondominated sorting-based multi-objective evolutionary algorithm which is called Non-Dominated Sorting Genetic Algorihtm II (NSGA-II). NSGA-II is able to minimize both objective functions of MT data simultaneously. Initially, NSGA-II is tested to obtain a set of model parameters (i.e resistivity and thickness values of each layer) from noise free and contaminated synthetic MT data in order to assess it’s performance. The obtained set of model parameters is known as pareto optimal solution set. Subsequently, NSGA-II is applied to field data in order to obtain the appropriate field model parameter. Both synthetic and field MT data inversion results show that NSGA-II is able to obtain model parameters of MT data which are associated with low misfit value.

Keywords: Magnetotelluric; Multi-objective; NSGA-II; Pareto optimal solution set


137


[ABS-111] Analysis of Wall-Effect on Particle Deposition in Fluid Using

Experimental and Numerical Methods

Nabilah Calista Balqis Aprillia* dan Umar Fauzi

Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung *[email protected]

Abstract

The mechanism of solid deposition in fluid is one of the most common phenomena in our daily life. There are various phenomenon involving interaction between solid and fluid, one of them is sedimentation which solid can move freely in fluid due to gravitational effect of the particle. To find out the behavior of particle that moving freely in fluid, many researchers do some research and the result show that the boundary wall of the system has effected the particle deposition process in fluid. There are some experiments and numerical approach had done to find out about the interaction between fluid and moving solid systematically. The numerical methods of fluid flow has been developed either two-dimensional or three-dimensional system. However, three-dimensional system is often difficult to simulate, so that the two-dimensional approach has done first. Based on the experiment, it can be seen that solid deposition process is affected by the wall. Furthermore, the numerical method result appears a similar result paired to the experimental result.

Keywords: Fluid, Experiment, Solid Deposition, Numerical Method


138


[ABS-120] Source detection on interferometric image: ALMA simulated and real

data

Ridlo W. Wibowo (*a, b), Taufiq Hidayat (a), Stephane Leon T. (b,c), Baltasar Vila-Vilaro (c), Premana W. Premadi (a)

a) Astronomy Department, Institut Teknologi Bandung, Bandung, Indonesia *[email protected]

b) European Southern Observatory, Santiago, Chile c) Joint ALMA Observatory, Santiago, Chile

Abstract

Image from radio interferometry observation can be tricky to interpret and analyze. Interferometers (always) do not sample all spatial frequencies of the sky, so the image we generate does not necessarily represent the real sky brightness distribution. Even though this sampling problem is much better for point source detection compared to diffuse emission detection. A large number of survey and source-count work from radio interferometric data depends on this problem. In this work, we analyze point source detection problem from ALMA interferometric observation. We will use ALMA simulated observation and also real observational data to quantify the probability of detection. We utilize CASA software to simulate and to analyze the ALMA data and SExtractor to do source detection. Preliminary result shows that in perfect observation (minimal PWV and phase error), 3.5 sigma threshold that people often used, can not be applied for interferometric data, it will only give a likelihood of < 20% of positive detection. Minimum of 5 sigma threshold is needed to get a likelihood of ~100% positive detection. In real observation a perfect condition is rarely achieved, this happen especially for extended configuration. Source detection from bad sidelobes image and also MCMC source detection will be explored.

Keywords: interferometric image, source detection


139


[ABS-130] Three Dimension Multiphase Flow Modelling Using Lattice Boltzmann

Method Rothman-Keller With Linear Temperature Gradient

Bintang Pradana*, Umar Fauzi

Rock Physics Laboratory, Department of Physics, Institut Teknologi Bandung Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

In oil and gas exploitation, only about 5% to 20% of hydrocarbons can be discharged through production wells with natural reservoir pressure. The oil and gas industry there is a method called enhanced oil recovery (EOR) to remove hydrocarbons still trapped in rock pores. To do EOR is not easy and required a considerable cost, modeling and simulation fluid in pore scale are needed. In fluid modeling there is continuous approach using the Navier-Stokes (NS) equation. Not only continuous approach, fluid modeling can also be done by using Molecular Dynamics (MD) approach. Between this two methods there is a method that bridging the advantages between the two. This method uses a macroscopic and microscopic approach (mesoscale) called Lattice Boltzmann Method (LBM). With this approach, the results obtained are quite accurate without the use of high computing devices. The LBM used in this research is the Rothman-Keller (RK) / color gradient method. This method assumes that the interaction force between two fluids is directly proportional to the two-fluid density ratio and has two collision operators, in which the second operator is the perturbation operator. Pressure boundary condition introduced by Zou-He added to this model. Then the temperature is given linearly and used to calculate object force due to the temperature gradient. This study shows that the model created has successfully simulated the flow of multiphase fluid in rock pores. The permeability data obtained is compared with the lab measurement data and the results are almost identical. In the temperature gradient model, the effect of force due to the temperature gradient has no significant impact because the value are very small compared to the average velocity of the fluid flow.

Keywords: Enhanced Oil Recovery, Lattice Boltzmann Method, Multiphase flow, Porous Media, Rothman-Keller


140


[ABS-131] Determination of the Orbital Elements of Sirius AB

Yuda Arif Hidayat, Wulandari, Suryadi Siregar

Department of Astronomy, Institut Teknologi Bandung

Abstract

Sirius AB is a visual binary star at coordinate RA 06 h 45 m 08.91 s, Dec-16º42’58.017” (J.2000). Sirius A is the main sequence in class spectra A1 V. Meanwhile, Sirius B is white dwarf in class spectra DA2. Orbital elements and physical parameters of this visual binary star can be calculated using Thiele-Innes-Van den Bosch method. This method is an elaboration of Keplers second law. In this work we reviewed data of separation (ρ) and position angle (θ) from Washington Double Star Catalogue (WDS-http://ad.usno.navy.mil/wds). Washington Double Star Catalogue is database that contains information about astrometric double and multiple star. WDS Catalogue has recorded more than 2000 data of Sirius AB between epoch 1862.09 until 2016.63.

The aim of this research is to determine orbital elements and masses of Sirius AB using Thiele-Innes-Van den Bosch method. We choose Sirius AB as our objects research because Sirius B is the white dwarf so that makes it unique. The orbital elements and physical parameters that obtained using Thiele-Innes-Van den Bosch can be used to derive masses of Sirius A and B.

Keywords: Sirius AB; Orbital element; Physical parameter; Thiele-Innes-Van den Bosch


141


[ABS-132] Automation of Reduction and Analysis of Chandra X-Ray Satellite Data

for Studies of Clusters of Galaxies

A. H. Fikri, H. Wulandari, K. Vierdayanti, A. N. I. Putri, D. G. Ramadhan

Astronomy Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Abstract

Clusters of galaxies are commonly used in constraining cosmological parameters, and in studies concerning dark matter and dark energy. Mass is a physical yet not observable parameter that should be estimated for this purpose. There are various methods for mass determination, one of them is by using the density and temperature profiles of the hot intracluster medium (ICM) in the clusters, which is observable in X-rays. It takes a series of data processing to obtain density and temperature profiles of the ICM. Chandra scripts are available for most of these purposes, still some processes should be done ‘by hands’ and therefore are quite tedious and time consuming, especially if we have to work with many clusters, which is common for cosmological studies. In this work we developed a script to automate the processes, enables generation of temperature and gas density profiles from raw data of multiple observations, making data processing easier and faster. The automation script uses a standard reducing data process from Chandra, extracting spectrum from data, and simultaneously fit the spectra of multiple observations while performing the deprojection process. We give some examples of cluster analysis to show how the automation works.

Keywords: cluster of galaxies, X-ray mass determination


142


[ABS-143] Memory based Hybrid Dragonfly Algorithm (MHDA): a New

Technique for Determining Model Parameter in Vertical Electrical Sounding (VES) Data

Irwansyah Ramadhani(*), Eko Minarto, Sungkono

Department of Physics, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia.

*[email protected]

Abstract

Vertical Electrical Sounding (VES) data inversion is a nonlinear inversion problem because several models can fit to the observed data. Therefore, a new nonlinear optimization technique is implemented to solve VES data inversion problem which is called Memory based Hybrid Dragonfly Algorithm (MHDA). This algorithm is proposed to solve drawback of Dragonfly Algorithm (DA), i.e. low convergence rate which is caused by high exploration behaviour of DA. That drawback can lead to the local optimum solution. MHDA, which adds internal memory and iterative level hybridization into DA, successfully balances exploration and exploitation behaviours of DA to obtain global optimum solution. In this research, Initially, MHDA is tested for the noise contaminated synthetic VES data to assess its performance. Subsequently, MHDA is applied for the field VES data in several problems. In both VES data, MHDA is able to provide Posterior Distribution Model (PDM) which is obtained from exploration process of MHDA. All accepted models of PDM have lower misfit value than specified tolerance value in the inversion process. The PDM can be used to estimate solution of VES data inversion via median value of PDM. Additionally, the uncertainty estimation of obtained solution can be determined from standard deviation value of PDM. The inversion results of both data indicates that MHDA is an innovative technique to solve VES data inversion problem.

Keywords: Memory based hybrid dragonfly algorithm; Posterior distribution model; Uncertainty estimation; Vertical electrical sounding data


143


[ABS-144] First light curve analysis of eclipsing binary system ASAS 185542-

0123.1

A. T. P. Jatmiko (1), M. Yusuf (1), M. Putra (2)

(1) Bosscha Observatory, Institut Teknologi Bandung (2) Astronomy Research Group, Institut Teknologi Bandung

Abstract

A very first light curve (LC) analysis of eclipsing binary ASAS 185542--0123.1 is presented. This star is part of our binary star survey project in Bosscha Observatory. The data was taken using our 0.36 m f/7.2 Bosscha Robotic Telescope (BRT) during observing season back in 2015. LC of this star was constructed by using LEMON, a semi--automatic photometric pipeline written in Python. We managed to refine orbital period of this system and its time of primary minimum, hence we could update its ephemeris as HJD (min I) = 2451964.571732 + 1.161607𝜙𝜙. We also conducted a LC modeling with PHOEBE (PHysics Of Eclipsing BinariEs) software (Prza & Zwitter 2005) built on top of the widely used WD program (Wilson and Devinney 1971). As part of modeling process, we incorporate data obtained by ASAS (grade A only to ensure best data quality) of this system to obtain full LC phase coverage. The photometry solutions are mass ratio 𝑞𝑞 = 0.465 ± 0.024, orbital inclination 𝑇𝑇 = 82.78 ± 0.28∘, effective temperature of primary and secondary component 𝑇𝑇1 = 5789.83°K and 𝑇𝑇2 = 5687.22 ± 26.88°K, respectively, and surface potentials both for primary and secondary component Ω1 = 4.22 ± 0.10 and Ω2 = 3.13 ± 0.07, respectively. In conclusion, this system is classified as detached eclipsing binary system which has almost similar temperature between its primary and secondary component with spectral type of G1/2V + G2/3V by comparing effective temperatures from this work with table given by Pecaut & Mamajek (2013). This result is differ from Houk et al (1999) which stated spectral type of F0/3V for both components.

Keywords: eclipsing binary, variable stars, PHOEBE, LEMON


144


[ABS-150] Study of management and development of Observatorium Astronomi

ITERA Lampung (OAIL) area

Annisa Novia Indra Putri (1) , Warid Zul Ilmi (2) , Afrizal Vatikawa (3) , Nindhihta Pratiwi (1)

1 Atmospheric and Planetary Sciences Study Program, Institut Teknologi Sumatera, Lampung Selatan, Lampung

2 Urban and Regional Planning Study Program, Institut Teknologi Sumatera, Lampung Selatan, Lampung

3 Law Study Program, Universitas Lampung, Bandar Lampung, Lampung

Abstract

Institut Teknologi Sumatera (ITERA) and Institut Teknologi Bandung (ITB) also Government of Lampung Province have launched the ITERA Astronomical Observatory or known with Observatorium Astronomi ITERA Lampung (OAIL). On 20th November 2016, the coordinates of the observatory were determined 05° 27’ 71” S and 105° 09’ 39” E with height of 1030 above sea level. Development of OAIL area will be the center of education in science field especially in Atmospheric and Planetary Sciences. OAIL also will become the center of ecotourism in Lampung Province which can become a tourist attraction for the people in Lampung even outside Lampung. Observatory is a building that must be protected. Therefore, it is necessary that management and development be directed so that the main function of the observatory is not disturbed. The criteria must be met so that OAIL area is included as specific area. Each criteria should be assessed to determine whether OAIL is included in specific area. In this research will do assessment about OAIL area by distribute questionnaire to some subjects like experts, related agencies, and surrounding communities to evaluate whether OAIL area can be a specific area or not.

Keywords: ITERA, OAIL, spesific area


145


[ABS-157] Long Term Behavior of Blazar OJ 287 in Optic, UV, and X-ray

S. Fatima and K. Vierdayanti

Astronomy Research Division, Faculty of Mathematics and Natural Sciences, ITB

Abstract

We investigate long term behavior of blazar OJ 287 in optic, UV, and X-ray by using Swift UVOT and XRT data spanning over 10 years of short exposure observations. Based on optical and UV data, we found a nice correlation between optical and UV flux which implies that the radiation is produced by a similar process. We also confirmed the occurrence of two super-flare episodes in 2007 and 2016/2017, both in optical and UV. An episode of significant increase in the optical and UV fluxes was also seen preceding the 2016/2017 super-flare which occurred in late 2015 to early 2016. We checked flux variability in X-ray data and found that it is not necessarily concurrent with those of optical and UV. In some cases, X-ray variability appears to be irrelevant to those of optical and UV. Both X-ray spectral and optical-UV-X-ray simultaneous spectral fittings, in general, showed a significant contribution of non-thermal processes.

Keywords: Blazar, OJ 287, multiwavelength


146


[ABS-170] Constraints on Dark Energy models in Cosmology from Double Source

Plane Strong Lenses system

Anton T. Jaelani, Ni Putu A. P. Emas, Premana W. Premadi, Fargiza A. M. Mulki

Bosscha Observatory, Institute Teknologi Bandung

Abstract

Double source plane (DSP) strong lenses has provided an important tool for probing galaxies and cosmology. The analysis of these system demonstrate the significant degeneracy-breaking power of even a single DSP. In this paper, we use the DSP data to constrain several dark energy models such as the holographic dark energy model, Ricci dark energy, etc. We also combine DSP data with CMB data to improve our constraint.

Keywords: Strong Lenses, Cosmology


147


[ABS-176] Morphology and Evolution of Coronal Holes in Multiple Wavelength

Isna Kusuma Dewi Astuti (*), Dhani Herdiwijaya

Department of Astronomy,Faculty of Mathematics and Natural Sciences, ITB *[email protected]

Abstract

The coronal hole is seen as an area that appears dark on the surface of the Sun in extreme ultraviolet (EUV) and X-ray wavelengths. Coronal holes are a major cause of high-speed solar wind. The coronal hole cycle is inversely to the 11 years Solar cycle. When the solar cycle is minimum, the frequency of the coronal hole is maximum. To find out the morphology and evolution of the coronal hole, it is necessary to determine the area of the coronal hole, so that changes can be detected in a time span. In this study, the data used from SDO (Solar Dynamic Observatory) in EUV wavelengths, namely 193Å and 211 Å. The image used is in interval of 6 hours.

Keywords: coronal holes, coronal holes: morphology, solar wind, EUV


148


[ABS-184] 3D Seismic Velocity Structure Imaging Beneath Flores Region Using

Local Earthquake Tomography

Regolinda Maneno(a,b,*)Bagus Jaya Santosa(a) and Gazali Rachman(c)

a) Physics Department, Insitut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya 60111, Indonesia

b)Timor University, East Nusa Tenggara, Indonesia *) [email protected]

c) Physics Education Department, Faculty of Teacher Training and Education, Universitas Patimura,

Jl. Ir. M Putuhena, Kampus Poka, Ambon, Maluku 97233, Indonesia

Abstract

Flores is one of the areas in Indonesia which shows high seismic activity associated with Back arc thrust activity and subduction zone of Flores arising from the collision of Australian plate and Pacific plate. Tectonic earthquakes required to be studied because in large magnitude it can bring disaster. Therefore we used Local Earthquake Tomography (LOTOS 12) to perform 3D seismic tomography that describe anomalous distribution of P and S wave velocities beneath Flores Region. We used 210 earthquake events data in Flores region which has magnitude >4 SR at period between January 2010 and March 2018 recorded by up to 4 stations downloaded from webdc.eu. We relocated the hypocenter of earthquake provided by webdc using hypo71 and the results showed that the hypocenter of the earthquakes experienced a change of position both horizontally and vertically. We also used Velest to obtain 1D velocity reference model of Flores region which is required as a initial model for LOTOS 12.

Keywords: Flores, LOTOS 12, 3D seismic velocity


149


[ABS-187] Imaging and Spectroscopic Observations of Total Lunar Eclipse July

2018

Irfan Imaduddin (a,b,c)*, Ade Nur Istiqomah (a,b), Wulandari (a,b), Shinta Nur Amalina (a,b), Ayu Dyah Pangestu (a,b), M. Rafiul Ilmi Syarifudin (a,b), Hakim L. Malasan (a,b,c,d)

a) Astronomy Study Program, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia

b) National Astronomy Olympiad Coaching Team (TPOA), Bandung, Indonesia c) Bosscha Observatory, Lembang, Indonesia

d) ITERA Astronomical Observatory, Lampung, Indonesia *[email protected]

Abstract

The Total Lunar Eclipse (TLE) on July 27-28, 2018 was a special phenomenon to witness particularly because of two reasons: 1) the Moon was on its apogee, made it look smallest from the Earth over the year and had the longest totality duration—1 hour 42 minutes and 57 seconds—of the 21st century; 2) the TLE took place in the middle of dry season, the most excellent time to observe. However, despite it is being one of the highlight of 2018’s astronomical events, it also offers a chance for us to do imaging and spectroscopic studies. In this presentation, we report the observations of the TLE July 2018 with the aim to obtain the Moon’s images at every phases and analyze the Earth atmospheric transmission profile.

The TLE observations were carried out in Bosscha Observatory, Indonesia (6° 49’ 28” S and 107° 36’ 56” E). Imaging and spectroscopic observations of TLE were conducted from midnight until dawn on July 28, 2018. The imaging observations were carried out with CMOS-based DSLR camera attached to a refractor (D = 90 mm, f/D = 10), while lunar spectra (λλ 608 - 710 nm) were obtained using a reflector (D = 254 mm, f/D = 10) equipped with a medium resolution spectrograph (slit width = 2.89”, R ~ 5000) with adjustable settings to record spectra with different central wavelength. The TLE imaging covered the first, second, and third contact of the eclipse. The fourth phase, when the Moon left the penumbra, was not observed as it was too low against the West horizon. Spectra of full moon and TLE during totality, with central wavelength around 608 nm, 628 nm, 650 nm, 660 nm, 680 nm, and 710 nm, were obtained. Furthermore, we discuss behavior of the Earth’s atmospheric transmission.

Keywords: Total Lunar Eclipse July 2018, lunar eclipse imaging, spectroscopic observation, lunar spectra


150


[ABS-203] Application of CSAMT and Magnetic Methods to Determine

Subsurface Structure of Tangkuban Parahu Area

Enjang Jaenal Mustopa(a*), Putri Nawangtari(a), Nurhasan(a), and Doddy Sutarno(a)

a) Earth Physics and Complex System Research Divison, Faculty of Mathematics and Natural Sciences,

Bandung Institute of Technology, Indonesia *[email protected]

Abstract

Tangkuban Parahu is located in Bandung, West Java, one of a volcano area. An integrated Controlled-source audio frequency magnetotelluric (CSAMT) and Magnetic methods survey across the area was carried out. The purpose of survey was to locate a subsurface structures of the area that may correlate to a geothermal reservoir in unknown geothermal potential area. The CSAMT survey has been conducted in the area using transmitter located in 3-5 km from the survey area. The objective of the survey was to determine a subsurface resistivity structures. On the other hand, the Magnetic survey was carried out in the same sites with the CSAMT sites. The corrected magnetic anomalies range from -1600 nT to 500 nT. Susceptibility value of magnetic anomalies -0.036 cgs interpreted as clay layer at the depth of 600 to 900 m. Clay layer can beinterpreted as caprock in geothermal reservoar. The results of the integrated interpretation of the CSAMT and Magnetic data show that the subsurface of the area has a correlation with a geothermal reservoir structure. It is also confirmed by several surface manifestations in the Ciater area, the north of the Tangkuban Parahu volcano.

Keywords: CSAMT; Magnetic; Geothermal; Tangkuban Parahu


151


[ABS-206] The Study Of The Electron Enhancements During Garuda-1 Satellite

Anomaly

Neflia

National Institute of Aeronautics and Space (LAPAN)

Abstract

Garuda-1 Satellite is one of Indonesian geostationary satellite. On April 5, 2005 Garuda-1 experienced power loss. According to space weather condition, This anomaly could be caused by the enhancement of electron during the day of anomaly and geomagnetic activity. The electron enhancement during quite solar activity have been associated with solar wind speed and IMF. For this study I will use solar wind speed, IMF , AE, Kp, Dst and Plasma Flow Pressure. The result of this study show that before the electron fluxes exceed 1000 pfu on April 5 at 13 UT, solar wind plasma speed exceed 500 km/s from April 4 at 16 UT until April 6 at 21 UT, with maximum speed, 646 km/s, occur on April 5 at 9 UT. AE index also increase from April 4 at 16 UT until April 6 at 09 UT, with maximum AE, 1024 nT, occur on April 5 at 18 and 21 UT. From April 4 at 14 UT until April 5 at 7 UT, Bz index directed southward, with minimum Bz, -8.8 nT, occur at April 5 at 1 UT. Kp index also increase from April 4 at 16 UT until April 6 at 09 UT, with maximum Kp, 7, occur on April 5 at 0-3 UT. Dst decrease from April 4 at 21 UT until April 6 at 09 UT, with minimum Dst occur on April 5 at 5-6 UT. The plasma flow pressure increase from April4 at 18 UT until April 5 at 3 UT, with maximum pressure, 6.9 nPa, occur on April 4 at 21 UT. This result indicate that plasma condition was disturbed which started with geomagnetic subtorm in the Auroral region before electron flux increase.

Keywords: satellite anomaly, electron enhancement, solar wind, geomagnetic activity, plasma pressure


152


[ABS-207] Tracing Stellar Close Encounter with Our Sun in GAIA-LAMOST-

RAVE Catalogues

Rendy Darma (a*), Wildan Hidayat (a), M. Ikbal Arifyanto (b)

a) Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia.

*[email protected] b) Astronomy Research Division and Bosscha Observatory, Faculty of Mathematics and Natural

Sciences, Institut Teknologi Bandung, Bandung, Indonesia.

Abstract

Our Sun is surrounded by Oort Cloud (in radius ∼0.5 pc) which can be perturbed by various external factors. One of those is the stellar close encounter with our Sun. This kind of perturbation can induce the cometary showers in our Solar System. These impacts can trigger the meteor bombardments on the Earth and its moon which have correlation to the extinction of dinosaurs. In this work, we make numerical simulations to trace the orbit of stars in Milky Way’s axisymmetric and non-axisymmetric potentials. We use 307 selected solar neighborhood ≤ 30 pc from our Sun) from Gaia DR2, LAMOST DR4, and RAVE DR5 which have highly precise kinematics. We tried 24 candidates of stellar close encounter which firstly determined from a few references in our numerical simulation. Most of them are in agreement with previous references which their minimum distances are less than 2 pc from our Sun.

Keywords: Milky Way, solar neighborhood, numerical simulation


153


[ABS-208] A STUDY THE POSITION OF PRE-CONJUNCTION MOON AT

THE SUNSET TIME WITH POSITIVE ALTITUDE IN INDONESIAN REGION

Moedji Raharto1(a), Novi Sopwan2(b), Muhamad Irfan Hakim1(c) and Yayan Sugianto1(d)

1 Astronomy Study Program, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology

CAS building, 6th floor, Jl. Ganesha 10, Bandung 40132, West Java, Indonesia 2 Program Studi Ilmu Falak, Fakultas Syariah dan Hukum UIN Sunan Ampel Jl. A. Yani 117

Surabaya 60237, East Java, Indonesia

a) [email protected] or [email protected] b) [email protected]

c) [email protected], d) [email protected]

Abstract

Hijri calendar is a pure lunar calendar. New month is determined by the first visibility of thin crescent after conjunction of the moon. In early phase of the calendar needs a practical naked eye observation of the young crescent visibility. The time of sunset is a border of changing of the day. The constraint of the maximum number of days in a month is 30 days and the minimum number of days in a month is 29 days. A year composed of 12 months, the maximum number of days in a year is 355 days and the minimum number of days in a year is 354 days. We select the moon in the day of conjunction, but at the time of sunset the conjunction does not occur yet. The position of the pre-conjunction moon at the time of sunset is usually below the horizon, but some cases the position of the pre-conjunction moon at the time of sunset are above horizon. This visible old crescent of pra-conjunction moon, may make confuse in hilal observation. We present some selected data of pre-conjunction moon at the time of sunset with positive altitude. This data is useful, to avoid some confusion on hilal observation, especially to determine the beginning of Ramadhan, Syawal and Dzulhijjah.

Keywords: pre-conjunction, Islamic calendar, hilal, crescent


154


[ABS-230] Diagenesis and Porosity Development of Gumai Carbonate Formation

in “NA” Field, Sunda Basin

Nadya Widya Putri*, Undang Mardiana, Reza Moh Ganjar Gani

Faculty of Geological Engineering, Padjadjaran University, Jalan Raya Bandung-Sumedang KM.21, Sumedang 45363, Indonesia

*[email protected]

Abstract

Gumai Carbonate Formation in the “NA” Field is one of the most unique reservoirs in the platform edge, western part of Sunda Basin. Gumai Carbonate Formation is dominated by carbonate rocks, which is deposited in post-rift and mainly under transgression conditions, although some regressive pulses have been recognized. “NA” Field consists of 10 wells include 8 exploration wells and 2 development wells. These carbonate rocks show complex facies, porosity, and permeability. The objectives of this research are to solve depositional environment and diagenetic processes, and to conceive the interconnection between diagenetic process and porosity development of carbonate rocks of the Gumai Carbonate Formation. A detailed facies, diagenetic and porosity development study was carried out from 27 thin sections of sidewall cores, 23 thin sections of conventional cores, detailed core description, and well logging data analysis.

The Gumai Carbonate Formation has undergone complex diagenetic processes, which include microbial micritization, aragonite dissolution, cementation of ferroan and non-ferroan sparry calcite, neomorphism, dolomitization, compaction, and calcite dissolution. The diagenetic history of Gumai Carbonate Formation can be divided into six stages: marine phreatic, phreatic vadose, freshwater phreatic, mixing zone, deep burial, and phreatic vadose environments.

Porosity of the Gumai Carbonate Formation in “NA” well is mostly secondary: vuggy, moldic, fracture, and channel porosity. These secondary porosity are not controlled by the depositional texture but more controlled by deposition time and its relation to the diagenesis at a certain time.

Keywords: Diagenesis, Porosity Development, Carbonate Reservoir, Gumai Carbonate Formation, Sunda Basin


155

Topic: Environmental sciences

[ABS-277] Primary Productivity of Blanakan Fishpond at Subang, West Java

Noverita Dian Takarina and Desi Octavia Runtuwene

University of Indonesia

Abstract

Subang regency is one of the largest fisheries area in West Java, so it is important to maintain the quality of fishpond area in Blanakan, Subang. Primary productivity can be defined as the production rate of organic carbon per unit time which is the result capturation of solar energy by green plants to be converted into chemical energy through photosynthesis. Primary productivity can be used to defined the quality of an ecosystem include fishpond. The aim of this research was to measure the value of primary productivity in Blanakan fishpond, know the correlation between nitrate, phosphate, and chlorophyl-a with primary productivity, and analyze the significance differences of primary productivity among three stations. The samples were collected from three sampling station, whili all of those were consists of mangrove Avicennia marina vegetation. Each of the stations were divided into two points based on different depth which consist of 0, 1 and 1,5 meters. The measurement of primary productivity was done by light-dark bottle method. Meanwhile, the concentration of nitrate, phosphate and chloropyl-a were measured by spectrophotometer method. The result showed that the value of primary productivity ranged from 39.0625 to 101.5625 mgC/m3/day with the highest value obtained at station I and the lowest value at station III. According to statistical test, there is a significance differences of primary productivity value among three stations with the value is 0.003 (p < 0.05). Correlation analysis also showed that primary productivity was correlated strongly with chloropyl-a and negatively correlated with nitrate and phosphate.

Keywords: Blanakan, chloropyl-a, nitrate, phosphat, primary productivity


156


[ABS-279] Network approach on characterizing floral diversity in the agroforestry

zone of Mount Makiling Forest Reserve, Philippines

Marisol P. Martinez (a), Ace Kevin Amarga(b), Geleena A. Gestiada(a), Marie Joy F. Lopez (c), Allen L. Nazareno(a), Ranzivelle Marianne L. Roxas-Villanueva(a*)

a) Institute of Mathematical Sciences and Physics, College of Arts and Sciences, University of the Philippines Los Banos, Philippines

*[email protected] b) Laguna State Polytechnic University Siniloan Campus, Philippines

c) Institute of Statistics, College of Arts and Sciences, University of the Philippines Los Banos, Philippines

Abstract

Biodiversity is used as an indicator of ecosystem health. Communities with high biodiversity are considered stable, productive and resistant to disturbances. Different indices are used to profile diversity . In this study, we characterize the floral diversity in three study sites in the agroforestry zone of Mount Makiling Forest Reserve using network analysis. Plant species found in each study site are considered nodes (N). Edges (E) are established between species with the same alternate role and habit. The dataset includes N = 157 and E = 4279 for Bagong Silang site, N = 145 and E = 3740 for the Karay site and N= 122 and E = 2429 for the Magnetic Hill site. Network parameters such as degree, path length, clustering coefficient, modularity and number of connected components were calculated. Obtained values were compared to published diversity index. Results show that lower clustering coefficient and higher average path length signifies higher diversity. A higher number of disconnected components also indicate diversity.

Keywords: floral diversity, diversity index, complex networks


157


[ABS-297] Measurement of The Night Sky Brightness in e-Maya Observatory

Laksmiyanti Annake Harijadi Noor*

Department of Astronomy, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung, Indonesia 40132

*[email protected]

Abstract

One of the ideal criteria for an observatory is the location that is related to its influence on the condition of the night sky. The observatory area is a light pollution-free area, far from the city or urban center. This is intended to get a dark night environment so the observations can be done well. The e-Maya Observatory is one of the observatories in Indonesia that located in Subang, West Java. Established in 2013, the observatorys work is relatively new in Astronomy field in Indonesia. This observatory was built in the area of Astha Hannas Subang High School which is about 18 km to the north from the center of Subang city. To find out the quality of the night sky and how big the impact of city lighting or the level of light pollution in the e-Maya Observatory area, it is necessary to measure the brightness of the night sky. Measurement of the night sky brightness used a simple sky brightness photometer, Sky Quality Meter (SQM), there are two SQM types used, SQM LU and SQM LU-DL. SQM measures the brightness value of the night sky in magnitude per unit of quadratic seconds (mag/arc sec2) all night on August 11-14, 2018 towards the east and west horizons with the slope angle of 30° (z = 60°) and pointed to zenith (z = 0°).

Keywords: night sky brightness, light pollution, e-Maya observatory


158


[ABS-60] Total and labile fraction of metals in surface sediments from Jakarta

Bay, Jakarta, Indonesia

Lestari, F Budiyanto, R. Puspitasari, D. Surinati, Y. Witasari and R. Rositasari

Research Centre for Oceanography, Indonesian Institute of Sciences Jl. Pasir Putih I, Ancol Timur, Jakarta, Indonesia

Abstract

The assessment of marine pollution due to metals was made for surface sediment from 25 sites in Jakarta bay. The method used for heavy metal analysis of total and labile fractions in sediments are extraction aquaregia procedure and HCl test. The sample were analyzed for leachable and total heavy metals contents (Cd, Cu, Fe, Pb and Zn) by flame atomic absorption spectrophotometer (air-acetylene) with deuterium background correction. Evaluation of the heavy metals pollution status was carried out using enrichment factors(EFs), the effects range-low (ERL) and the effect range –median (ERM). The result showed that total metals in sediment were as follows, metals Cd, Cu, Pb and Zn concentrations in the fraction of total ranged between 0.14-1.51 μg/g, 10.5-369-1.51 μg/g, 4.91-101 μg/g and 42-2403 μg/g. Fraction of labile Cd, Cu, Pb and Zn concentrations ranged between 0.01-0.99 μg/g, 3.2-18.1 μg/g, 3.2-91.2 μg/g, and 16.5-213 μg/g. The percentage of labile fraction of Cd, Cu, Pb and Zn ranged between 3.2-80.4%, 4.8-95.5%, 17.0-90.5%, and 7.4-86.9%. This study indicated that Cd, Cu, Pb and Zn was assosiated with the bioavaibility and therefore potentially influence their bioacumulation of benthic organism. Based on EFs, pollution status in sedimen from Jakarta Bay with anthropogenic sources.

Keywords: Total fraction, Labile fraction, Surface Sediment, Pollution Assessment, Jakarta Bay


159


[ABS-61] Heavy metals fractionation in surface sediments from Surabaya Waters,

East Java, Indonesia

Lestari, F Budiyanto , T. Purbonegoro, R. Puspitasari, M.R. Cordova, Suratno and R. Rositasari

Research Centre for Oceanography, Indonesian Institute of Sciences Jl. Pasir Putih I, Ancol Timur, Jakarta, Indonesia

Abstract

Abstract. Seventeen surface sediment collected from Surabaya Waters were analyzed for total concentration and chemical fractionation. Chemical fractionation of metals Cu and Ni was studied using a modified sequential extraction procedure proposed by the European Standard, Measurements and Testing (SM&T) program, formerly the Community Bureau of Reference (BCR). The aim of this study are to determine geochemical fraction of 4 bounds of metal: acid-soluble, reducible, oxidizable and residual and to assess their impacts in the sediments of Surabaya Waters, Indonesia. The result shows that percentage of copper (46.53-70.76%) were mostly accumulated in residual fraction of the total concentrations and nickel (43.73-68.16%) mostly accumulated in non residual fraction of the total concentrations. The Risk Assessment Code (RAC) reveal that about 1.54-6.67% of Copper at sites exist in exchangeable fraction and therefore low risk category. While 14.53-35.06% of Ni at sites exist in exchangeable fraction and therefore medium risk category to aquatic environment.

Keywords: Sequential Extraction Procedure, BCR, Metals, Sediment, RAC, Surabaya Waters


160


[ABS-331] Identification Of Surface Area I Unit I Sarulla Geothermal Power Using

Satellite Image In Pahae Jae District,Tapanuli Regency North

Togi Tampubolon, Juniar Hutahean, Rita Juliani, Yolanda Panggabean

Department of Physics, State University of Medan

Abstract

Has conducted research using satellite imagery. This study aimed to determine environmental changes in the area of geothermal Sarulla geothermal power plants. Changes in the environment can be identified by utilizing remote sensing technology. The methods used to conduct the survey: bringing GPS, thermometer and collect satellite data Landsat 8 Oli. Analysis of the environmental changes observed by a change vegetation greenness level (NDVI), and temperature. Research result shows a decrease in NDVI index, and the temperature increase. NDVI and LST relationship is inversely proportional. From this research it can be concluded that there has been damage to the environment in the area. So the results of this study can be recommended to the public and the government.

Keywords: Sarulla Geothermal Power Plant Unit I, Geothermal, Landsat 8 OLI, temperature, NDVI


161


[ABS-94] Water Critical Level in Karst Gombong Selatan and Surrounding Area

Kebumen Regency, Indonesia

Wahyu Widi Astuti, Tito Latif Indra, Kuswantoro

Universitas Indonesia

Abstract

Some karst areas have dry and unproductive areas and often experience of drought phenomena and critical water such as in the Karst Area of Pegunungan Sewu in Wonogiri and Gunung Kidul. But there are some other karst areas that just excessive water like Karst in Pangkep Maros, South Sulawesi. This study aims to analyze the variation of monthly water criticality level in Karst Gombong Selatan and surrounding areas spatially and temporally. The research variables used rainfall and geological factors to calculate water availability, and the number of residents, the number of school students, the number of industries, the number of facilities health, number of worship facilities, and wide market area to calculate water needs. Rainfall data used is the monthly rainfall data used during the years 1988-2017 from 2 rainfall precipitation stations. The method used to calculate and compare the quantity of water needs and monthly water availability quantitatively. The results show that temporal water criticality occurs only in months such as June, July August and September. Spatially, the region with criticality is close to critical-very critical in June-September and mostly clustered to the Northeast and North to the Middle of the study area.

Keywords: Karst area, Kebumen Regency, rainfall, water critical


162


[ABS-134] The Effect of Leather Tanning Wastewater on Paddy Fields, a case

study in Garut District, West Java

T. Taufikurahman (a*), Trimurti Hesti Wardini (a), Lida Amalia (b), Andira Rahmawati (a), Asih Suryati (a), Raden Roro Deby Anindya Rizkyani (a)

a) School of Life Sciences and Technology, Bandung Institute of Technology, Jl. Ganesa 10, Bandung, 40132, Indonesia

*[email protected] b) Biology Education, Faculty of Applied Sciences and Science, Indonesia Institute of Education,

Jl. Terusan Pahlawan No. 32 Tarogong Kidul Garut, 44151, Indonesia

Abstract

Leather tanning wastewater which contains chromium (Cr) pollutes river which is located close to the industrial area. In Garut district, leather tanning industry wastewater is dumped into Cigulampeng river, where its water usually being used to irrigate nearby paddy fields. The paddy fields affected by leather tanning wastewater reached an area of 37.1 ha in Kota Wetan village and 76 ha in Sukamentri village. This research is aimed to determine the effect of tanning wastewater on paddy fields in Sukamentri village, Garut district. A descriptive quantitative method using questionnaires and interviews with local farmers in polluted and unpolluted paddy fields was employed. In addition, an observation on environmental factors including chemical and physical conditions of river water and paddy fields was also conducted. The polluted water is characterized by its frequently changing in color within a day, producing bad smell, and contain toxic substance mainly chromium. Paddy cultivars planted in the polluted area including Rojolele (65.71%), Sarinah (42.8%), Widas (37.715%), Ciherang (20%), and Mega (11.43%). These paddy cultivars were chosen by farmers mostly based on their ability to withstand pollution and pest (mainly rats). Leather tanning wastewater decreased paddy production. The percentage of reduction in rice production due to polluted water can be categorized into low (25.71%), medium (34.28%), high (34.28%), and very high (45.71%). According to farmers, the contaminated water also caused itching and burning sensation to their skin, dizziness, and nausea.

Keywords: Chromium; Paddy; Leather tanning wastewater; Cigulampeng river; Garut


163


[ABS-172] Optimizing Photoperiodism, Growth Media Dilution, and Frequency of

Inoculum Addition in Microalgae (Chlorella vulgaris) Culture Using Bioslurry (ADDMW) as Growth Media

T.Taufikurahman, Teguh Adhitia Suyadi

School of Life Sciences and Technology, Bandung Institute of Technology

Abstract

In biogas production using dairy manure, an anaerobic digestion process also produced a by product bioslurry, also known as Anaerobically Digested Dairy Manure Wastewater (ADDMW), which is rich in nutrient. The availability of some organic compunds such as ammonium, phosphate, and other nutrients make ADDMW potentially to be used as growth media to grow autotrophic organism, including microalgae. Furthermore microalgae potentially could reduce organic content in ADDMW, thus play a role as phycoremediator to organic waste water. In this study we used ADDMW medium for the growth of microalgae, determining its growth kinetics and level of reduction in ammonium and orthophosphate content in ADDMW. In addition, we also analysed protein content in microalgae biomass for potential use as animal feed. The experiment was conducted using some variations in photoperiodism i.e. 16:8; 12:12; and 8:16 and medium dilution factor of 2.5 and 5 times. Furthermore, frequency of inoculum addition was also examined i.e. a) 80 mL on day 0 (once); b) 26.67 mL on day 0 to 2 (first 3 days); and c) 8 mL on days 0 to 9 (every day). The results showed that 16:8 photoperiod and 5 times medium dilution produced the highest biomass growth and productivity kinetics. Variation in frequency of inoculum addition showed no significant effect to a decrease in ammonium levels, but indicated some effect to orthophosphate level. Protein content in microalgae biomass cultivated in ADDMW showed slightly higher level (11.49 ± 0.51%) compared to protein content from biomass cultivated on synthetic medium (Bold Basal Medium) (9.29 ± 0, 23%). It can be concluded that microalgae can be grown in ADDMW media and can reduce its organic content, as a phycoremediator, before the wastewater is dumped to the river.

Keywords: ADDMW, Bioslurry, Chlorella vulgaris, Microalgae, Phycoremediation


164


[ABS-183] Adsorption Studies of Removal Chromium (Cr) from Electroplating

Wastewater Using Activated Carbon (Coconut Shell))

Madalena Da Costa(a, b*) and Wahyono Hadi(a)

a) Departement of Environment Engineering, Faculty of Civil, Environment and Geo Engineering, Institut of Technology Sepuluh Nopember, Sukolilo 6011, Surabaya Indonesia

*[email protected] b) University of Timor, East Nusa Tenggara, Indonesia

Abstract

Removal chromium (Cr) ions from electroplating wastewater using batch experiment was conducted with activated carbon adsorption. The aim of this study was to investigated the influences of adsorbent size (1,7 mm; 2 mm; 2.36 mm) and the initial Cr concentration (50%; 75%; 100%) in the wastewater. Removal Cr ions by verying the parameters such as pH, adsorbent size, adsorbent dose and contact time to achieve a higher removal capacity. Result show that the optimum pH for Cr ions was found to 2; 3 g/l dose; 90 minute and maximum adsorption of adsorbent size for each concentration ion in the wastewater was different there were 50% > 75% > 100%. Maximum adsorpsi capacity (97,39%) of Cr on 1,7 mm was observed at 50% initial concentration. Langmuir and Freundlich adsorption isotherm models were applied to the adsorpstion process. The kinetics adsorpstion process was found to follow pseudo second order rate mechanism. Result indicated that the precentage of removal is highly dependent of adsorben size and concentration of Cr ion in the wastewater.

Keywords: Chromium ion, adsorption, electroplating wastewater, removal


165


[ABS-205] Analysis of Organic Micropollutants in the Surface Sediment and Mud

Clams (Polymesoda erosa) Samples from Segara Anakan Lagoon (SAL), Cilacap, Indonesia

Muhammad Yudhistira AZIS(1), Anne PIRAM (2), Laurence ASIA(2), Buchari BUCHARI(1), Agung Dhamar SYAKTI(3), Pierre DOUMENQ(2)

(1)Analytical Chemistry Division, Department of Chemistry, Institute of Technology Bandung, Jl. Ganesha No. 10, Bandung 40132, Indonesia

(2)Environmental Analytical Chemistry Laboratory (LCE), FRE-CNRS 3416 Equipe MPO, Europôle de l’Arbois-Bátiment Villemin BP 80 Aix en Provence Cedex 4, France

(3)Center for Maritime Biosciences Studies- Institute for Research and Community Empowerment-Jenderal Soedirman University, Jl. Dr. Suparno, Purwokerto 53123, Indonesia

Abstract

This work involves the assessments of contamination level of polychlorinated biphenyls (PCBs) and organochlorines pesticides (OCPs) in the surface sediments and mud clams (Polymesoda erosa) samples in Segara Anakan Lagoon (SAL). ∑7PCBs concentrations in sediments were found in the range of 0.11±0.05 to 2.63±0.1 μg.kg-1 sed.dw. OCPs levels were found in the range of 0.2±0.05 to 2.9±0.01 μg.kg-1 sed.dw. Sixteen polyaromatic hydrocarbons (PAHs) (USEPA) in P.erosa were analysed. They were found in the range of 103.34±2.01 to 1348.31±18.21 µg.kg-1 tissue dry weight (dw) and OCPs content were found in the range of 0.87±0.03 to 24.79±1.30 µg.kg-1 tissue dw. Matrice interferences have been evaluated with propre samples with suitable rendement extraction and rendement analysis. Sediment quality guidelines (SQGs) has been used to measure the quality of sediments for PCBs and OCPs (i.e pp’-DDE).

Keywords: Segara Anakan Lagoon (SAL), Polymesoda erosa, Surface sediments PAHs, PCBs, OCPs


166


[ABS-216] Metals Content In Edible Gastropod From Blanakan Silvofishery

Ponds

Desmita Artalina, Noverita Dian Takarina

University Of Indonesia

Abstract

Human activities contribute waste and promote threats on water quality. Heavy metals contamination is one of the threats. High input of heavy metals on ponds will affect organism including gastropods. Horn snail (Telescopium telescopium) is one of the non-cultural biota which is consumed by humans. This research aimed to determine metal content in horn snail from Blanakan silvofishery ponds. Sampling was done on April 2018, conducted in three ponds randomly. Metals content were analysed using Atomic Absorption Spectrophotometry. Result showed that the highest Pb content was in pond 3 at 19,46 mg/ kg, the highest Cu content was in pond 3 at 27,52 mg/ kg, and the highest Zn content was in pond 1 at 21,28 mg/ kg. The BCF values ranged 0,05 – 4,57 showed that horn snail has a tendency to accumulate heavy metals. Based on BPOM No. 03725/B/SK/VII/89, people must be more careful in consuming horn snail. In the future, horn snail can be used as bioindicator to control heavy metals pollution.

Keywords: Heavy metals, Gastropod, Telescopium telescopium, silvofishery


167

Topic: Life sciences

[ABS-270] Visualization of Microlejeunea Oil Body by using Transmission

Electron Microscopy

Dhita Mutiara Nabella, Desandra Aulia, Afiatry Putrika*, and Astari Dwiranti

Department of Biology, FMIPA Universitas Indonesia, Kampus UI Depok, Depok, 16424, Indonesia

*Corresponding author: putrikafi22gmail.com

Abstract

Oil bodies are highly distinctive organelle uniquely found in liverworts. Besides the importance of this structure in taxonomy, many of the secondary metabolites contained within the oil bodies are also of the great value as potential sources of medicines. Thus, the investigation of liverwort ultrastructure is essential to give an insight into the oil bodies structure and function. Microlejeunea is one of the leafy liverworts found in Universitas Indonesia that has not previously been reported to exist in Java island. In this study, we evaluated the ultrastructure of Microlejeunea by using Transmission Electron Microscopy (TEM). Microlejeunea were fixed with 2.5% glutaraldehyde, post-fixed with 4% Osmium tetroxide, dehydrated with Ethanol series, and then subjected to resin embedding. After the samples were embedded, sectioning by ultramicrotome was performed, followed by the post-staining with Uranyl acetate and Lead Citrate, and then the samples were finally observed by TEM. Our results clearly showed the oil bodies of Microlejeunea for the first time. The structure of oil bodies could be distinguished with the other parts of the cells. Further analysis of the oil bodies by comparing our data with other types of leafy liverwort in Universitas Indonesia will be beneficial for the species identification as well as the exploration of their secondary metabolites.

Keywords: Leafy Liverworts; Oil bodies; Microlejeunea; TEM


168


[ABS-271] The Effect of DryingStep in the Preparation of Microlejeunea for

Scanning Electron Microscopy Observation

Furqannul Masri, Desandra Aulia, Afiatry Putrika*, and Astari Dwiranti

Department of Biology, FMIPA Universitas Indonesia, Kampus UI Depok, Depok, 16424, Indonesia

*Corresponding author: putrikafi22gmail.com

Abstract

Microlejeunea is one of the leafy liverworts found in Universitas Indonesia that has unique characteristics and its existence in Java Island has not been reported before. The ultrastructure analysis of Microlejeunea is important not only as the mean of identification but also for further exploration of their oil body which contains useful metabolites. Ultrastructure investigation can be accomplished by using Scanning Electron Microscopy (SEM). However, the optimization of the preparation steps for biological sample observation by SEM, including liverworts,is necessary to be carried out. Drying step plays the important role in maintaining the structure of the sample as close-to-native as possible. Thus, in this study, we evaluated the effect of the drying step in the preparation of Microlejeunea for SEM observation. Microlejeunea were fixed with 2.5% glutaraldehyde, post-fixed with 4% Osmium tetroxide, dehydrated with Ethanol series, and then subjected to different drying method, i.e. air-drying and freeze-drying. According to the data obtained, samples dried by using freeze-drying methodshowed the more detailed structure in conjunction with the up-and-down contour, without any artifact covering the surface of the samples, while air-dried samples showed the flat surface hiding the real structure of the cell.Our data suggested the advantages of freeze-drying in preparing Microlejeunea for ultrastructure investigation using SEM.

Keywords: Drying; Freeze-Drying; Leafy Liverworts; Microlejeunea; SEM


169


[ABS-18] The Abundance of Macrozoobenthos in Lematang River, South

Sumatera, Indonesia

Novin Teristiandi; Andhika Puspito Nugroho

Universitas Gadjah Mada

Abstract

Coal mining has become a ubiquitous environmental problem causing pollution to aquatic ecosystems. Coal mining activities generate solid waste and acid mine drainage with low pH and heavy metal contamination. Lematang River, located in Lahat, South Sumatera, flows through important coal mining region. Coal mining waste can reach Lematang River through surface run off and carried out to river after being processed. Macrozoobenthos is one of the important components in river ecosystem, which is often used as river pollution bioindicator. This study investigated the abundance of macrozoobentos and the influence of several environmental parameters on the abundance of macrozoobenthos in the Lematang River. Samples were collected from 3 sampling site based on above and below point of the coal mines, over a periode of four months (September–Desember 2017). Analysis of their relationships with environmental parameters was performed using Multiple regression in SPSS 24. The lowest abundance of macrozoobenthos was found at below point of the coal mines, and dominated by tolerant organisms Chironomus sp. Intolerant organism such as Stenelmis sp. was found at above point. Scraper, collector and predator groups were found at all sampling sites, while shredder was not found. The below point had higher concentrations of Fe and Mn. Concentration of Mn and the interaction among physical and chemical factors significantly affect the abundance of macrozoobenthos in Lematang River.

Keywords: coal mine, diversity, heavy metal, macrozoobenthos, lematang river


170


[ABS-275] The Effects of Blue Light Exposure to Beta Brain Wave for Night

Driving Activity in a Car-Driving Simulator

Dr. Lulu Lusianti Fitri (a*), Kinanti Prestiasani (a), Dr. Suprijanto (b)

a) School of Life Sciences and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

b) Faculty of Industrial Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

The Central Bureau of Statistics reported the number of traffic accidents in Indonesia is 106,129 with 26,185 casualties. Among 69% of the factors causing this accident is driver decline in cognitive function, usually known as sleepiness or drowsy driving (KNKT Database, 2016). Driving is a complex activity that engange complex motor, sensor and cognitive function. These function usually measured trough brain wave by using electroencephalograph (EEG) as measuring method. Exposure of blue light to people while doing night-driving has been shown to improve cognitive function with increase of beta brain wave. However, no previous studies have described the long-term and repetition effects of the blue light exposure. In this study, fifteen adult male had driving session on the car simulator with a straight and monotonous road for 30 minutes without pause. The participants divided into three groups; driving without extra light (control group), driving Alt exposure from polichromatic blue light, and driving with continuous irradiation of blue LED light (monochromatic). During the driving session the participant’s brain beta brain wave was measured using EEG. The brain wave power spectral density from two channels (F3 and F4) representing the right and left hemisphere of the frontal lobe, which associated with cognitive function was extracted and analyzed. The results showed that there was a significant increase of beta wave power on the second day of exposure in both blue light treatment group. Monochromatic blue light group showed more stable beta waves than the control and polichromatic blue light groups which indicates stronger cognition process. There is also synchronization from the F3 and F4 sections in all treatment groups. In conclusions, repeated continuous exposure of blue light can increase both alpha and beta waves, in which monochromatic blue light causes better cognitive state than polichromatic blue light.

Keywords: drowsy driving, brain wave, EEG, power spectral density, blue light, beta wave


171


[ABS-45] Peppermint (Mentha piperita) as Antidepressant on Male Wistar Rat

(Rattus rattus) Exposed to Blue Light

Elvania Andisa and Lulu L. Fitri

School of Life Science and Technology, Bandung Institute of Technology

Abstract

Exposure to blue lights at night may cause physiological disruption to organism such as stress and depression. Normally, depression are treated with antidepressant drugs that can lead to side effect. So, that natural ingredients are used as an alternative treatment. The aim of this study was to examine the activity of Mentha piperita as an antidepressant agent in decreasing stress behavior that showed by immobility time in rat. Seventy five male wistar rats with 250-300 g average weight were divided into 5 groups and treated, as follows: (1) non-stressed, (2) blue light + solvent, (3) blue light + mint 140 mg / kg, (4) blue light + mint 280 mg / kg, and (5) blue light + fluoxetine 14 mg / kg. Blue light exposure was given for 7 days with various fotoperiode, i.e. 12 bright / 12 dark, 18 bright / 6 dark, and 24 bright / 0 dark. At the end of treatments, all rat were assigned on FST test for immobility and swimming time measurements. Blue light exposure for 18 and 24 hours can lead to depression-like symptomps. The Peppermint extract (140 mg/kg and 280 mg/kg) showed a significant antidepressant-like effect in the immobility and swimming time on FST. This result almost similar with obtained result of fluoxetine administration. Therefore, it can be concluded that Mentha piperita is potentially to act as antidepressant by decreasing immobility time and increasing swimming time on FST.

Keywords: Blue light, Mentha piperita, antidepressant, Forced Swimming Test, immobility time, swimming time


172


[ABS-112] Inventory of Local Rice Cultivars in Ponorogo

Mahmudah Hamawi, Niken Trisnaningrum

Universitas Darussalam Gontor

Abstract

Ponorogo regency as one of the rice granaries in East Java has a variety of rice cultivated by farmers. The research aims to inventory local rice cultivars in Ponorogo district. The study was conducted in March - May 2018 in Ponorogo district. The method used is survey by Snowball sampling technique at 11 sub-districts from 21 sub-districts in Ponorogo regency. The results of the inventory obtained 32 local rice cultivars in Ponorogo consisting of 15 white rice, 4 brown rice, 2 black rice, 5 white sticky rice, 3 red sticky rice and 3 black sticky rice.

Keywords: rice, sticky rice, white, red, black


173


[ABS-129] EFFECT OF ALUMINUM STRESS ON ONION (Allium Cepa L.)

Peni Astrini Notodarmojo; Trimurti Hesti Wardini


Abstract

This study analyzed the effect of Aluminium (Al) on onion (Allium cepa) root growth and its defense response. The experiment was carried out by exposing onion to 10, 100, 500 and 1000 µM AlCl3 for 24, 48 and 72 hour. Parameters observed were root length and diameter, root tip mitotic index, cortical parenchyma cell length and cortical cell layer thickness. Onion defense response observed by measuring mallic, citric and oxalic acid quantitatively, and the accumulation of Al and callose in root qualitatively. Results showed that an increase in the concentration of Al caused a decrease in root length. At concentrations up to 100 µM, Al increased root diameter cell length whilst at higher concentrations, Al decreased both parameters. Compared to control, all Al-treated root had lower index mitosis with 10 uM Al-treated root displayed highest IM. Since root treated with Al higher than 10 µM showed none or very low mitotic activity, chromosome aberration can only be observed in 10 uM Al–treated roots. Root defense response via Al and callose accumulation was increased with the increasing of Al concentrations. Organic acids were present in higher amounts in root than in medium with a ratio of 5000:1. Oxalic acid appeared to be the major organic acid that played a role in defense mechanisms against Al stress. Based on the results, it can be concluded that (1) Al3+ were toxic to Allium cepa because it caused root growth inhibition and chromosomal aberrations; (2) defense response for Al3+ stress were via the increase of callose as well as Al accumulation and organic acids content in root cells.

Keywords: Allium cepa, aluminum, defense response, organic acid, stress


174


[ABS-135] Prospect of Tagetes erecta Linn. to Control Cylas formicarius Fabr. on

Ubi Cilembu (Ipomoea batatas Var. Rancing)

Wina Supriani (1*), Trimurti Hesti Wardini (2)

1) Plant Science and Biotechnology Research Group, School of Life Science and Technologi, Institute of Technology Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]/[email protected] 2) Plant Science and Biotechnology, School of Life Science and Technologi Research Group,

Institute of Technology Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Sweet potatoes (Ipomoea batatas Poir.) is a root vegetable with suprising number of nutrient categories for the health benefits, which can be used both as an alternative staple food in the dry season and as substitute food in food diversification efforts. In sweet potato’s cultivation, farmers often experience crop failure, one of which is due to pest attack caused by the Cylas formicarius Fabr weevil. Tagetes erecta Linn. (Tagetes) has been reported to have an insecticide effect onvarious pests that attack plants. The aim of this research was to determine the effect of Tagetes plant on the intensity of weevil attacks on Cilembu sweet potato cultivation. The experiment was conducted in Cicalung village in Sumedang, West Java using randomized complete design. Treatment included TC (adding Cylas and Tagetes in to the plot), T (adding Tagetes only), C (adding Cylas only) and K (no Cylas and Tagetes added in to the plot ) as a control. Tagetes were planted around the plot and in each treatment plot 20 Cylas weevils were introduced. Results showed that the presence of Tagetes reduced the intensity of pest attacks. The intensity of weevil attack on the plot of K, T, TC, and C were 34%; 9%; 16% and 62%, respectively, with an average number of Cylas per tuber were 38 larvae, 8 imago; 14 larvae, 6 imago; 15 larvae, 8 imago; and 72 larvae, 23 imago, respectively. Tuber dry weight in plot where Tagetes was added, showed an increase compared to control (T: 46.69 g, TC: 42.66 g compared to K: 37.69 g) while in plot C tuber dry weight showed the lowest value of 34.90 g. GC-MS analysis on Tagetes root and flower extract showed the presence of αlpha-terthienyl, which has been widely reported as one of the active compounds with insecticidal effect. From this study, it can be concluded that planting Tagetes around sweet potatoes plants can reduce the intensity of pest attacks and α-terthienyl compound is likely to play a role in the reduction of pest attacks.

Keywords: Tagetes erecta; sweet potato; Cylas formicarius; percentage of damage; αlpha terthienyl


175


[ABS-161] Analysis of Phosphate Solubilizing Bacteria from Mangrove Sediments and Their Relation to Bird Presence in Pulau Rambut Wildlife Reserve,

Indonesia

Restu Utari Dewina (a*), Devi N Choesin (a)

a) School of Life Science and Technology, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Mangrove forests provide important ecosystem services. Microbes play a key role in the functioning of these ecosystems, i.e., in the decomposition of organic nutrients into inorganic form so that they can be used by plants. Inorganic phosphate is a limiting factor for mangrove growth, thus the presence of phosphate solubilizing bacteria (PSB) is important in mangrove forest ecosystems. Besides microbes, birds are organisms that act as sources of available phosphate. The island of Pulau Rambut is an avian wildlife sanctuary with an uneven distribution of birds in its mangrove forests. This variation in bird abundance is expected to have an impact on the mangrove ecosystem and its PSB community structure. The objective of this study was to determine the PSB community structure in sediments and relate them to the presence of birds as a source of available phosphate. PSB were isolated from mangrove sediments from the northern area of the island which has been observed as a bird nesting site, and from the western area which is not a bird nesting site. PSB were isolated using National Botanical Research Institutes phosphate growth selective medium, then abundance, species richness, and Shannon-Wiener diversity index (H’) for both sites, as well as the Sorensen similarity index, were calculated. The PSB diversity index was then correlated with biotic and abiotic factors in each site by Pearson correlation. Results showed that there were five PSB species in both nesting and non-nesting sites with a Sorensen similarity index of 71.42%. The PSB diversity index in the non-nesting site (1,23) was higher than in the nesting site (1,11), due to the higher abundance of PSB in the former site. Molecular analysis by 16s RNA identified the predominant bacteria species as Salinicola tamaricis. Factors that were positively correlated (> 0.90) with the variety of PSB include soil organic C content and vegetation diversity, while factors that were negatively correlated (< –0.90) include soil salinity, total P, available P, and bird species richness.

Keywords: birds, mangrove, phosphate solubilizing bacteria, Pulau Rambut


176


[ABS-162] Numerical Model Development on Ultrasound-Assisted Extraction

Process for Production of Nutmeg (Myristica fragrans Houtt) Oleoresin

Maryam Al Lubbu, I Wayan Budiastra, Y. Aris Purwanto, Sutrisno

Post-harvest Technology Study Program, Department of Mechanical and Bio system Engineering, Bogor Agricultural University (IPB), Indonesia

Abstract

Ultrasound-Assisted Extraction (UAE) is an alternative method to produce oleoresin from nutmeg (Myristica fragrans Houtt) seeds. The effects of ultrasound power (45, 60, 75, 90% amplitude) and excitation time (30, 45, 60, 75 minutes) were investigated to determine correlation to oleoresin yield. A model was built to describe the extraction process based on Fick’s first law and oleoresin extraction mechanism. The single factor experiment method for each parameter has been used to solve the formula and was validated by simulation data. To evaluate the model, the yield of oleoresin was determined to correlate between the experimental and predicted data. The result showed that the model could be used to represent the yield of nutmeg oleoresin production using Ultrasound-Assisted Extraction method.

Keywords: Ultrasound-Assisted Extraction, nutmeg, oleoresin, numeric model


177


[ABS-166] Optimization Steam Time Of Human Hair Waste To Improve Plant

Media Quality And Growth Of Leaf-Lettuce Plant (Lactuca Sativa L.)

Widiyanti, Trimurti Hesti Wardini

Bandung Institute Of Technology

Abstract

Human hair waste steamed at 121°C, 1,5 atm for 45 and 90 minutes has been reported increasing growth media quality and leaf-lettuce plant (Lactuca sativa L.) growth compared with soil. However there was no significance difference between both steam times. The aim of this research is to evaluate optimum steam time of human hair waste between 45 and 90 minutes to increase growth media quality and leaf-lettuce plant growth. Leaf-lettuce was planted in polybag containing soil and hair with ratio 1:20 (total media was 3 kg soil per polybag). Treatment groups were TR (soil + hair), TRS 45 (soil + hair steamed for 45 minutes), TRS 60 (soil + hair steamed for 60 minutes), TRS 90 (soil + hair steamed for 90 minutes), and TRS 135 (soil + hair steamed for 135 minutes) with T (100% soil) and R (100% untreated hair) as control groups. This research was conducted for two successive planting seasons using the same growth media. Result analysis showed TR, TRS 45, TRS 60, TRS 90 and TRS 135 media increase in porosity, aeration and CEC value (9-12%, 17-22%, 4-13% respectively). However there was no significance difference compared with T control group. Among all treatments, TRS 135 porosity, aeration, and CEC has the highest value which was 66-76%, 20-29%, and 30-41% respectively. WHC and pH in all treatment groups decreased, 4-13% for WHC and 7,2 to 6,8 for pH. The decreasing WHC and pH observed was not statistically different compared with T control group. On the first planting, leaf-lettuce growth in treatment groups were not significant compared with T control group. On the second planting, leaf-lettuce planted on TRS 60 resulted the best growth comparing with other treatments, but lower than T control group. N and P content of growth media and plant tissue in all treatments increased although its increasing was not statistically significant compared with T control group. Generally, hair waste steamed for 135 minutes increased growth media quality while steaming for 60 minutes increased leaf-lettuce growth.

Keywords: human hair, steaming time, leaf-lettuce, plant media quality, growth


178


[ABS-167] Pollen Fluorochromatic Reaction in two varieties of cocoa (Theobroma

cacao L.)

Rina Ratnasih Irwanto and Muhammad Ikhsan Nugroho Saputro

School of Life Sciences and Technology, ITB, Jalan Ganesa 10, Bandung

Abstract

Cocoa (Theobroma cacao L.) is among the most important plant commodity in Indonesia. In community-managed plantations, to obtain higher quality and quantity of fruit production, the communities grow many varieties in the plantation. Cocoa is a cultivated plant that has a high diversity of characteristics, Phenotypic information can be a used as a clue about the structure of the genome as well as the cultivation potential of a type of plant. Phenotypic characters that can be obtained easily and can be characterised at the variety level are leaf morphology and pollen viability. In this study we focused on pollen viability. The aim of the study is to determine the effect of variety and temperature on pollen viability by fluorochromatic reaction (FCR) using fluorescein diacetate (FDA). The experiment used Sulawesi and local cocoa varieties taken from Tanaman Perkebunan (BPBTP), Kota Bandung. The Sulawesi variety is the result of breeding and the clones of this variety have a larger size and higher number of seeds compared to local cocoa. In addition, the Sulawesi variety has disease resistance. Local varieties are cacao derived from various varieties by crossing freely between individual plants that have high gene diversity. Fluorochromatic reaction used 30 flower samples, incised right after anthesis and incubated for 4 hours in 15°C, 25°C and 35°C. Pollen mounts were prepared after incubation and were stained using FDA then observed under blue light (λ = 495 nm). FCR result suggests that varieties do not have a significant effect on pollen viability; whereas temperature has a significant effect on pollen, with the highest viability observed at 35°C.

Keywords: pollen viability, Theobroma cacao, variety


179


[ABS-169] Estimation of Carbon Stock in the Mangrove Ecosystem of Pulau

Rambut Wildlife Reserve, Indonesia

Nuraini A. Hartono & Devi N. Choesin

Biology Study Program, School of Life Sciences and Technology Institut Teknologi Bandung, Jalan Ganeca 10, Bandung 40132, Indonesia

Abstract

Mangrove ecosystems sequester atmospheric CO2 and converts it into biomass, therefore playing an important role in the mitigation of global climate change. In order to support policy initiaves related to climate change, there is still a need for scientific data on carbon sequestration and storage in coastal (blue carbon) ecosystems from many geographical areas. The small island of Pulau Rambut in the province of DKI Jakarta, Indonesia, is a wildlife reserve/avian sanctuary characterized by mangroves and seagrass meadows as its natural vegetation. The objective of this study was to estimate carbon stock within the mangrove ecosystem of Pulau Rambut. Estimation was conducted by measuring aboveground live biomass and belowground biomass of mangrove trees, necromass, litter, and substrate, and their organic carbon content. Data were collected from 40 x 5 m2 plots at two sites, i.e., at the western and northern parts of the island. Six species of mangroves were identified at Pulau Rambut, i.e., Bruguiera gymnorrhiza, Rhizophora mucronata, Ceriops tagal, Avicennia officinalis, Xylocarpus moluccensis, and Excoecaria agallocha. Carbon stock estimates fall within the range reported in other studies, i.e., as follows: belowground mangrove vegetation 58.534 Mg C ha-1, aboveground live mangrove vegetation 32.695 Mg C ha-1, necromass 22.924 Mg C ha-1, and litter 13.886 Mg C ha-1. Analysis of substrate carbon is currently in progress; carbon content from the top 5 cm layer is estimated at 51.9 Mg C ha-1.

Keywords: carbon stock, mangrove, Pulau Rambut


180


[ABS-188] SENSORY EVALUATION OF MANGOES GROWN IN

DIFFERENT REGION OF ACEH TAMIANG DISTRICT, ACEH, INDONESIA

Adi Bejo Suwardi(1*), Zidni Ilman Navia(2), Tisna Harmawan(3), Syamsuardi(4), Erizal Mukhtar(4)

1. Department of Biology Education, Faculty of Teacher Training and Education, Samudra University, Langsa, Aceh, 24416, Indonesia

*[email protected] 2. Department of Biology, Faculty of Engineering, Samudra University,

Langsa, Aceh, 24416, Indonesia 3. Department of Chemistry, Faculty of Engineering, Samudra University,

Langsa, Aceh, 24416, Indonesia 4. Department of Biology, Faculty of Mathematics and Sciences, Andalas University,

Kampus Limau Manis Padang, 25163, West Sumatra, Indonesia

Abstract

The colour, flavour, and taste of fruit products are factors critical to consumer acceptance and the success of these products. The aim of this study was to evaluate the sensory characteristics of five mangoes grown in Aceh Tamiang region. The sensorial evaluation of mangoes was conducted by using 9 point hedonic scale. One hundred panelist were selected on the basis of their ability to discriminate and scale a broad range of different attributes. Flavour characteristics of Mangifera odorata collected from all region were found to be superior among colour and taste. However, this species was rated inferior for other sensory attributes (colour, taste, and overall acceptability). Mangifera indica was recorded for maximum taste, flavour and overall acceptance score.

Keywords: Sensory characters, Mangifera, Aceh Tamiang, Aceh


181


[ABS-194] Edible Wild Fruit Contribution for Food Security, Food Diversity, and

Household Income in the Leuser Ecosystem Area of Aceh Tamiang District

Zidni Ilman Navia(1*), Adi Bejo Suwardi(2), Andini Saputri(1)

1. Department of Biology, Faculty of Engineering, Samudra University, Langsa, Aceh, 24416, Indonesia

*[email protected] 2. Department of Biology Education, Faculty of Teacher Training and Education,

Samudra University, Langsa, Aceh, 24416, Indonesia

Abstract

Edible wild fruits (EWFs) refer to the original exotic fruit trees and naturalization that occur in the natural environment. The aim of this study was to investigate the indigenous knowledge on the use of edible wild fruits (EWFs) and assess their contribution to the food security, dietary diversity, and income of households in the Leuser Ecosystem, Aceh Tamiang District. Data were collected through a survey of 100 households randomly selected from five subdistrict and focus group discussions. Forty three species were found to be used as sources of edible fruits. Twenty four of the EWFs were harvested by 60% or more of the households. EWFs accounted for 25-80% of the annual food supply of households. There are 18% of EWFs involved in selling and contributing to household income of more than 50%. The results reveal that EWF is very important for local communities and shows that the availability of EWF plays an important role in rural livelihoods through guarantees of food security, dietary diversity, and sustained income.

Keywords: edible wild fruit, food security, food diversity, household income, Leuser, Aceh


182


[ABS-210] Traditional storage to extend the shelf life of mutant cassava

Rina Heldiyanti (a), Sutrisno (a), Nurul Khumaida (b), Emmy Darmawati (a)

a) Postharvest Technology, Bogor Agricultural Unversity, Indonesia b) Plant Biotechnology, Bogor Agricultural University, Indonesia

Abstract

Through the crop improvement, IPB is trying to fulfill the future need of cassava by creating the mutant cassava with high yield and high starch content. However, the main problem of cassava generally is the short shelf life due to its physiological properties. As one of storage method, a traditional method using sawdust in a wooden box is chosen to be evaluated as the method to extend the shelf life of mutant cassava. The aims of this research were to evaluate the: 1) changes in physical and chemical characteristics of mutant cassava during storage, 2) shelf life of mutant cassava through the degree of root decay. This research used a completely randomized design factorial consist of two factor; 1) cassava genotype (G21541 and G31521) and 2) sawdust moisture content (control and 14%). The mutant cassava was stored for 35 days. .The result indicated that this storage method gave a significant effect on the starch and water content of the two genotype of mutant cassava. This storage method extent the shelf life of mutant cassava until 35 days with only 25% of physiological decay and 0% of microbiological decay, compared to control that only lasted for 14 days.

Keywords: traditional storage, sawdust in wooden box, mutant cassava


183


[ABS-211] Survival and Reproductive Value of Hermetia illucens (Diptera:

Stratiomyidae) on Vegetable and Fruits Waste Rearing Substrates

Ucu Julita (a*), Lulu Lusianti Fitri (a), Ramadhani Eka Putra (a) and Agus Dana Permana (a)

a) School of Life Sciences and Technology, Institut Teknologi Bandung, Jl. Ganeca 10 Bandung 40132, West Java Indonesia

*[email protected]

Abstract

Hermetia illucens has been a topic of interest in the ecological research world for many years especially in terms of its role as a bioconverter agent. Bioconversion process through Hermetia illucens represents a potential valuable solution to two problems: organic waste management on the one hand and, on the other, the rising global demand for animal feed (transform organic waste into valuable animal feedstuff in the form of their last larval stage or prepupa). In this context, the aim of this study is to assess the survival and reproductive value of Hermetia illucens reared on vegetable and fruits waste. All treatments were constructed under laboratory conditions at 26±1◦C temperature and 68%±0.5% relative humidity. The adult cage was placed near the window that allows sunlight to enter. Data were collected and analyzed based on an age-stage, two-sex life table. The intrinsic rates of increase (r) were 0.06877 and 0.05772 per days, finite rate of increase (λ) were 1.0712 and 1.0594 per days, net reproduction rate (R0) were 25.88 and 19.99 offspring, and mean generation time (T) were 46.403 and 50.00 days on vegetable and fruits waste, respectively. Our results demonstrated high mortality in the larval period that probably caused by high levels of water produced by vegetables and fruits waste during the experiments.

Keywords: Hermetia illucens, organic waste, reproductive value, survival rate


184


[ABS-215] Authentication of Honey from Apis Cerana Fab.: Pollen Diversity and

Chemical Composition

Tiffany Hanik Lestari*, Ratna Susandarini

Faculty of Biology, Universitas Gadjah Mada, Jalan Teknika Selatan, Yogyakarta 55281, Indonesia

*[email protected]

Abstract

Honey refers to a natural liquid produced by honey bees including Apis cerana Fab. The investigation on the honey authentication according to both the pollen diversity and the chemical composition are required in order to enhance the quality control of local honey in Indonesia. The purpose of this study is to understand the type of pollen for tracing the variation of nectar sources. The chemical composition of the honey is also evaluated as the baseline. The pollen diversity is determined by identifying the type of pollen in the honey samples. The chemical composition is analyzed by the spectroscopy method using the Fourrier Transform Infra Red (FTIR) with Attenuated total reflection (ATR) diamond.

Keywords: Pollen analysis, FTIR, Apis cerana Fab., Honey authentication


185


[ABS-221] 16S rRNA Gene Sequences Analysis of Thermophilic Actinobacteria Isolated from Soil in Cisolok Geothermal Area, West Java, Indonesia

Fitria Ningsih (1,2), Dhian Chitra Ayu Fitria Sari (2), Mazytha Kinanti Rachmania (1), Shuhei Yabe (3,4), Akira Yokota (3), Ariyanti Oetari (1,2), Wellyzar Sjamsuridzal (1,2*)

1) Department of Biology, 2) Center of Excellence for Indigenous Biological Resources-Genome Studies, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia

*sjwelly[at]hotmail.com; sjwelly[at]sci.ui.ac.id 3) Department of Microbial Resources, Graduate School of Agricultural Science, Faculty of

Agriculture, Tohoku University, 468-1 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-0845, Japan 4) Hazaka Plant Research Center, Kennan Eisei Kogyo Co., Ltd., 44 Aza-Inariyama, Oaza-

Ashitate, Murata-cho, Shibata-gun, Miyagi 989-1311, Japan

Abstract

The thermophilic Actinobacteria are potential producers for bioactive substances and commercially important enzymes, yet their diversity in geothermal area in Indonesia have been rarely reported. In our previous study, a new thermophilic Actinobacteria genus belonging to the family Pseudonocardiaceae has been isolated from soil in Cisolok geothermal area. This current study reports the taxonomy and findings of potentially new taxa of thermophilic Actinobacteria, based on phylogenetic analysis of 16S rRNA gene sequences. Eighteen isolates of thermophilic Actinobacteria were isolated from soil samples and maintained using previously described methods. The 16S rRNA gene sequence-similarity search against all related species was performed using EzTaxon-e database (https://www.ezbiocloud.net/). The sequences of 18 isolates showed similarity to member of family Streptomycetaceae (genus Streptomyces; 7 isolates), Thermomonosporaceae (genus Actinomadura; 5 isolates), Streptosporangiaceae (genus Microbispora; 2 isolates), Thermoactinomycetaceae (genus Laceyella; 1 isolate), Micromonosporaceae (genus Micromonospora; 1 isolate), Pseudonocardiaceae (genus Amycolatopsis; 1 isolate), and Nocardiaceae (genus Nocardia; 1 isolate). Eleven out of 18 isolates are belong to non-Streptomycetaceae family, thus regarded as rare Actinobacteria. Thirteen out of 18 isolates showed 16S rRNA gene sequence-similarity values 98 – 99% to their closely related species, suggested the potential for findings novel taxa of thermophilic Actinobacteria from Cisolok geothermal area. Complete 16S rRNA gene sequencing and detailed phylogenetic analysis from the potentially new taxa are required to clarify their identity within Actinobacteria families.

Keywords: thermophilic Actinobacteria, 16S rRNA gene, Cisolok geothermal area


186


[ABS-222] Assessing Thermostable Xylanase from Thermophilic Actinobacteria

Isolated in a Geothermal Area, West Java, Indonesia

Mazytha Kinanti Rachmania (1), Fitria Ningsih (1,2), Dhian Chitra Ayu Fitria Sari (2), Shuhei Yabe (3,4), Akira Yokota (3), Wellyzar Sjamsuridzal (1,2*)

1) Department of Biology, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia

2) Center of Excellence for Indigenous Biological Resources-Genome Studies, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia

* sjwelly[at]hotmail.com; sjwelly[at]sci.ui.ac.id 3) Department of Microbial Resources, Graduate School of Agricultural Science, Faculty of

Agriculture, Tohoku University, 468-1 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-0845, Japan

4) Hazaka Plant Research Center, Kennan Eisei Kogyo Co., Ltd., 44 Aza-Inariyama, Oaza-Ashitate, Murata-cho, Shibata-gun, Miyagi 989-1311, Japan

Abstract

Various genera of Actinobacteria from extreme environments have been reported to produce the thermostable xylanase. Xylanases catalyze the hydrolysis of xylan by cleaving glycosidic bonds in its backbone structure. Xylan is a major organic component of hemicellulose, which is found in lignocellulosic biomass from plant cell walls, and it has an important role in industry, such as in the manufacture of paper and textiles. Thermophilic Actinobacteria are less explored due to difficulties in the isolation process, yet the production of enzymes that are thermostable at high temperatures is important for many industrial applications. The aim of this study was to obtain thermostable xylanase-producing thermophilic Actinobacteria from soil in the Cisolok geothermal area, West Java, Indonesia. From this region, we obtained 18 isolates of thermophilic Actinobacteria. These isolates were grown on minimal (Mm) agar plates, with and without the addition of 0.5% (w/v) xylan as a substrate and incubated for 3 to 7 days at 45 °C. Hydrolysis of xylan was detected by flooding plates with 0.2% (w/v) Congo red and rinsing with 1 M NaCl solution. Thirteen out of 18 isolates showed clear zone around the colonies, indicated positive results for xylanolytic activity. These isolates hydrolyzed 0.5% xylan at 3 days of incubation, while five isolates showed no xylanolytic activity after being incubated for 7 days. The examination of the effect of temperature on the xylanase production on 13 positive isolates is still an ongoing experiment.

Keywords: thermophilic Actinobacteria, thermostable xylanase, soil, geothermal area


187


[ABS-223] A Comparison of Agar and Gellan Gum as Solidifying Agent in Stimulating Sporulation in Rare Thermophilic Actinobacteria

Dhian Chitra Ayu Fitria Sari (2), Fitria Ningsih (1,2), Akira Yokota (3), Shuhei Yabe (3,4) Ariyanti Oetari (1,2), Wellyzar Sjamsuridzal (1,2*)

1. Department of Biology, 2. Center of Excellence for Indigenous Biological Resources-Genome Studies, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia

*sjwelly[at]hotmail.com/sjwelly[at]sci.ui.ac.id 3. Department of Microbial Resources, Graduate School of Agricultural Science, Faculty of

Agriculture, Tohoku University, 468-1 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-0845, Japan 4. Hazaka Plant Research Center, Kennan Eisei Kogyo Co., Ltd., 44 Aza-Inariyama, Oaza-

Ashitate, Murata-cho, Shibata-gun, Miyagi 989-1311, Japan

Abstract

Rare Actinobacteria are commonly considered non-Streptomyces Actinobacteria, which are not frequently isolated using conventional methods. Rare thermophilic Actinobacteria have recently received attention relating to their diversity and role as novel bioactive compounds. There is a need for an effective method to stimulate the growth and sporulation of rare thermophilic Actinobacteria. Gellan gum with calcium chloride significantly stimulated the formation of aerial mycelium and spores of rare Actinobacteria isolates. In this study, we evaluated the sporulation of rare thermophilic Actinobacteria on four media, including International Streptomyces Project (ISP) 1, ISP 2, ISP 3, and Bennett’s media, solidified with agar and gellan gum. We isolated and purified from soil and litter samples in geothermal areas 14 strains of rare thermophilic Actinobacteria from the genera Thermobispora, Thermoactinomyces, Amycolatopsis, Microbispora, Nocardia, and Actinoallomurus according to procedures modified from previously described methods. These strains were incubated at 45 and 55 °C, and sporulation was observed for 7 days. Results showed that sporulation on media solidified with agar was better on ISP 3 (10 strains), followed by ISP 2 (eight strains), ISP 1 (six strains), and Bennett’s (two strains) media. However, media solidified with gellan gum induced sporulation for a larger number of strains than that solidified by agar. For example, ISP 3 solidified with gellan gum induced the sporulation of 12 strains, followed by ISP 2 (nine strains), ISP 1 (10 strains), and Bennett’s (five strains) media. These results indicated that media solidified with gellan gum induced increased sporulation for a larger number of rare thermophilic Actinobacteria compared to media solidified with agar.

Keywords: rare thermophilic Actinobacteria, gellan gum, agar, solidifying agent


188


[ABS-224] Thermostable Cellulolytic Enzyme-Producing Thermophilic

Actinobacteria Isolated from a Geothermal Area in West Java, Indonesia

Putri Pratiwi Setyaningsih (1), Fitria Ningsih (1,2), Dhian Chitra Ayu Fitria Sari (2), Shuhei Yabe (3,4), Akira Yokota (3), Wellyzar Sjamsuridzal (1,2*)


2) Center of Excellence for Indigenous Biological Resources-Genome Studies, FMIPA Universitas Indonesia, Depok 16424, Indonesia *sjwelly[at]hotmail.com; sjwelly[at]sci.ui.ac.id

3) Department of Microbial Resources, Graduate School of Agricultural Science, Faculty of Agriculture,

Tohoku University, 468-1 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-0845, Japan 4) Hazaka Plant Research Center, Kennan Eisei Kogyo Co., Ltd., 44 Aza-Inariyama, Oaza-

Ashitate Murata-cho, Shibata-gun, Miyagi 989-1311, Japan

Abstract

Extracellular thermostable cellulolytic enzyme-producing thermophilic Actinobacteria have great commercial prospects in various industrial, medical, and agricultural applications. Geothermal areas are a common source of thermophiles that produce thermostable enzymes. The aim of this study was to investigate thermophilic Actinobacteria isolated from soil in the Cisolok geothermal area, West Java, Indonesia, as a potential producer of thermostable cellulase. An agar plate-clearing assay was used to screen the isolates of 18 thermophilic Actinobacteria for extracellular cellulase production. Screening for thermostable cellulase was performed on minimal (Mm) agar media with and without the addition of 1% (w/v) carboxymethylcellulose (CMC) as a substrate, and plates were incubated at 45 °C for 3 to 7 days. Enzyme activity was observed by staining plates with 0.2% (w/v) Congo red and rinsing them with 1 M NaCl solution. Formation of a clear zone around colonies indicated cellulose hydrolysis. A total of 15 out of 18 isolates showed positive results for cellulase enzyme activity after 3 days of incubation while three isolates did not show enzyme activity after being incubated for 7 days. Results showed that thermophilic Actinobacteria isolated from soil samples in the Cisolok geothermal area are potential producers of cellulase. An ongoing experiment is conducted to clarify the thermostable cellulase-producer among 15 positive isolates in the current study.

Keywords: thermophilic Actinobacteria, thermostable cellulase, soil, geothermal area


189


[ABS-225] Screening of Thermostable Amylolytic Enzyme-Producing

Thermophilic Actinobacteria Isolated from a Geothermal Area in West Java, Indonesia

Winda Ayu Syafitri (1), Fitria Ningsih (1,2), Dhian Chitra Ayu Fitria Sari (2), Shuhei Yabe (3,4), Akira Yokota (3), Wellyzar Sjamsuridzal (1,2*)


2) Center of Excellence for Indigenous Biological Resources-Genome Studies, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia

*sjwelly[at]hotmail.com; sjwelly[at]sci.ui.ac.id 3) Department of Microbial Resources, Graduate School of Agricultural Science, Faculty of

Agriculture, Tohoku University, 468-1 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-0845, Japan

4) Hazaka Plant Research Center, Kennan Eisei Kogyo Co., Ltd., 44 Aza-Inariyama, Oaza-Ashitate, Murata-cho, Shibata-gun, Miyagi 989-1311, Japan

Abstract

The focus of industrial screening has shifted to members of some of the lesser-exploited prolific groups of thermophilic Actinobacteria. Thermophilic Actinobacteria from extreme environments are important sources of industrial enzymes. Geothermal areas are a common source of thermophiles, which produce thermostable enzymes. Thermostable amylase may enhance thermal stability and reduce microbial contamination on an industrial scale. The aim of this study was to obtain thermostable amylase-producing thermophilic Actinobacteria isolated from the soil of a geothermal area in Cisolok, West Java, Indonesia. In total, eighteen isolates were grown on minimal (Mm) agar plates, with and without the addition of 1% (w/v) starch as a substrate and incubated for 3 to 7 days at 45 oC. Actinobacterial colonies hydrolyzing starch were detected by flooding plates with 1% (v/v) Lugol’s iodine solution. Clear zones around the colonies indicated as a positive result. Results showed that 15 out of 18 isolates have amylolytic activity at 3 days, while one isolate at 7 days of incubation. The remaining two isolates showed no amylolytic activity, even after 7 days of incubation. These results indicated that thermophilic Actinobacteria isolated from soil samples in a geothermal area of Cisolok are potential producers of amylase. The examination of the effect of temperature on the amylase production is ongoing to confirm the thermostable amylase-producer among 16 positive isolates.

Keywords: thermophilic Actinobacteria, thermostable amylase, soil, geothermal area


190


[ABS-235] Landslide Vulnerability Mapping in Batur District, Banjarnegara

Regency, Central Java Province

Rizqi Syafrudin and Mangapul P Tambunan

University of Indonesia

Abstract

Subdistricts in Banjarnegara Regency that are prone to landslides are Batur District. Batur Subdistrict is located in the north of Banjarnegara Regency which according to BPBD has the potential to be a medium-high category landslide, and the population in this village is crowded. This study aims to analyze the level of vulnerability and the level of vulnerability of landslides in Batur District, Banjarnegara Regency. Analysis of landslide disaster vulnerability used the Analytical Hierarchy Process (AHP) method obtained by experts in their fields. The vulnerability of landslides is classified into three levels of regional vulnerability, namely, low, medium, and high. analyzing disaster vulnerability used the Inarisk method issued by BNPB in 2012, namely by determining the disaster index such as social vulnerability, physical vulnerability, economic vulnerability, and environmental vulnerability. After getting the index, it is divided into 3 levels of regional vulnerability, namely, low, medium and high. In Batur Subdistrict, landslide-prone areas are in all villages in Batur Subdistrict, with the widest order, Bakal Village and the smallest is Sumberejo Village. Batur Village is a village in Batur District which has the highest vulnerability index of landslides. Karang village has a medium level disaster potential and vulnerability index. Whereas other villages such as Kepakisan, Pekasiran, Pesurenan, Bakal, Dieng Kulon and Sumberejo have a low potential and vulnerability index.

Keywords: Analytical Hierarchy Process, Land Slide, Vulnerability


191


[ABS-237] Analysis of AGAMOUS Gene Expression in Hibiscus rosa-sinensis L.

Single Pink, Crested Peach, and Double Orange Flowers

Andi Salamah and Ita Rostina

Department of Biology, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia

Abstract

Hibiscus rosa-sinensis L. crested peach and double orange types are different from single pink type regarding their additional petals (petaloid). The petaloid structure is thought to have originated from reproductive organs modification (homeosis). AGAMOUS is class C gene that plays a role in androecium and gynoecium formation. Loss of AGAMOUS gene expression is assumed to cause modifications occur in reproductive organs. Therefore, this study aims to determine the qualitative expression of AGAMOUS gene on single pink, crested peach, and double orange flowers. Analysis of AGAMOUS gene expression was done by isolating RNA from their androecium and gynoecium using the modified CTAB method. The RNA sample was converted to cDNA using reverse transcriptase, before further amplified by PCR technique using AG1 and AG2 primers. The AG1 PCR product produces bands of 100, 200, and 300 bp, while the PCR AG2 produces a single band of 200 bp. The analysis of sequencing results showed that AGAMOUS gene expressed in all samples. Therefore, petaloids presents in crested peach and double orange flowers are not caused by loss of AGAMOUS gene expression. The homeosis occurred should be analyzed not only based on AGAMOUS gene expression but also should include other gene and their interactions.

Keywords: AGAMOUS, Hibiscus rosa-sinensis L., homeosis, petaloid


192


[ABS-238] The Effects of Blue Light Exposure to Alpha Brain Wave for Night

Driving Activity in a Car-Driving Simulator

Kinanti Prestiasani (a), Dr. Lulu Lusianti Fitri (a), Dr. Suprijanto (b)

a) School of Life Sciences and Technology, b) Faculty of Industrial Technology, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Driving is a complex activity that engage complex motor, sensor and cognitive function. Decrease of cognitive function while driving, usually linked with drowsiness often results on casualties on the road. The complex cognitive functions usually measured trough brain wave using electroencephalograph (EEG) as measuring method. Exposure of blue light to people while doing night-driving has been shown to improve cognitive function with decrease of alpha waves that represents relaxed state as indicators. However, no studies have described longer duration and repetition effects of the blue light exposure. In this study, fifteen adult male had driving session on the car simulator with a straight and monotonous road for 30 minutes without pause. The participants divided into three groups; driving in a dark room condition without extra lighting (control group) , driving with exposure from polichromatic (450-540 nm) blue light , and driving with continuous irradiation of blue LED light with specific wavelength that is 460 nm (monochromatic). During the driving session, the participant’s alpha wave was measured using EEG. The brain wave power spectral density from two channels (F3 and F4) representing the right and left hemisphere of the frontal lobe, associated with cognitive function which was extracted and analyzed. The results showed that there was a significant increase of alpha wave power on the second day of exposure in both blue light treatment groups. However, the increase of alpha power despite often associated with relaxed state, takes role as the alternate wave in the dynamics with the beta wave power, which was also increased in the second day and gave off increase of overall cognitve function of the participants. This condition indicates that alpha and beta does not necessarilly works in antagonistic way. It is also seen that brain wave synchronization from the F3 and F4 sections in all treatment groups. In conclusions, repeated continuous exposure of blue light may increase alpha waves power, in which monochromatic blue light causes better cognitive state than polichromatic blue light.

Keywords: drowsy driving, brain wave, EEG, power spectral density, blue light, alpha wave


193


[ABS-248] Effect of Sound Vibration on Proline Levels in Spinach Plants

(Amaranthus viridis)

Aldi Yazri Siregar (a*), Saika Faradila (a), Aditya Bariq Ikhsan (b), & Andi Salamah (a)

a. Department of Biology, Faculty of Mathematics and Natural Sciences, Universitas Indonesia b. Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia

*[email protected]

Abstract

The environment in which living things live is full of sounds. Plants can respond to sounds with a cellular response. The response that occurs in plants due to sound vibration treatment can be hormonal, sugar, or proline changes. In this research will be discussed the increase of proline level due to sound vibration. Proline is an amino acid that becomes indicators of stress in plants. Proline can accumulate in plants, whether under stress or not. In this research, spinach (Amaranthus viridis) with age of two weeks as an experimental model. There are three kinds of sound vibration which are given, 250 Hz, 2000 Hz, and 3000 Hz, with one control. After being treated with different frequencies, the result is that the vibration can affect the proline level. Treatment with a frequency of 2000 Hz obtained the lowest proline level compared to other frequencies, namely 250 Hz and 3000 Hz. However, this frequency does not affect significantly of height growth level of the spinach plant after four weeks of observation.

Keywords: Amaranthus viridis, sound vibration, proline


194


[ABS-253] Antimicrobial Activity and Metabolite Characterization of Lichens-

Associated Actinomycetes Isolated from Cibinong Science Center (CSC) West Java

Agustina Eko Susanti (1), Shanti Ratnakomala (2), Wibowo Mangunwardoyo (3), Puspita Lisdiyanti (2)

(1) Postgraduate Student Department of Biology, Faculty of Mathematics and Natural Science Universitas of Indonesia, Depok, 16424, Indonesia

(2) Research Center for Biotechnology, Indonesian Institute of Sciences, Jl. Raya Bogor Km. 46, Cibinong 16911

(3) Department of Biology, Faculty of Mathematics and Natural Science Universitas of Indonesia, Depok, 16424, Indonesia

Abstract

Actinomycetes known as the largest antibiotic producer that has a broad range habitat. Some research has done to find new antibiotic from the various habitats of actinomycetes. One of the interesting habitats of actinomycetes which never been explored in Indonesia is lichens. Lichens as the symbiotic structure of alga and fungi known as the ecological niche of various kinds of microbes including actinomycetes. The five samples have collected of tree lichens from Cibinong Science Center (CSC) and were isolated 94 isolates of Actinomycetes. Determination of antimicrobial activity by agar diffusion method to 49 isolates against Bacillus subtilis BTCC B.612, Escherichia Coli BTCC B.614, Candida albicans BTCC Y.33, Staphylococcus aureus BTCC B.611, Micrococcus luteus BTCC B.552. Isolate LC-23 showed potency against the microbes that include Gram positive bacteria. The identification result based on 16s rRNA sequence, isolates LC-23 was 98.51% similarity to Streptomyces palmae. Metabolite extract of LC-23 was then analyzed to find the Minimum Inhibitory Concentration (MIC). The ethyl acetate extract was subjected to HPLC fractionation against the microbes to find the effective phase of the extract as anti-Gram positive bacterial substances. Also, neighbor-joining phylogenetic tree confirmed the relationships of this strain to other members of Streptomyces genera.

Keywords: Actinomycetes, Antimicrobial, Identification 16S rRNA gene, Lichen


195

Topic: Material science

[ABS-282] ORGANIC DIAMINE PILLAR POSITION OF 𝑯𝑯𝑭𝑭𝑯𝑯− (𝑪𝑪𝑯𝑯𝑻𝑻)𝑷𝑷 −

𝑯𝑯𝑯𝑯𝑭𝑭.𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑪𝑭𝑭 HYBRID WITH n = 3-4

Damar Aji Nurrahman Sumarsono, Djulia Onggo

Division of Inorganic and Physical Chemistry, Institut Teknologi Bandung, Bandung

Abstract

Hybrid is a combination of perovskite-like polymeric inorganic layers, which formed from divalent metal ions linked with 6 corner sharing ligand, and organic cations, a protonated diamine intercalated on each inorganic layers forming a pillar. Previously 𝐻𝐻3𝑁𝑁 − (𝐶𝐶𝐻𝐻2)𝑛𝑛 − 𝑁𝑁𝐻𝐻3 copper (II) hybrid with n=2-4 have been prepared, however, the pillar position of formed hybrid has not explained with detail yet. In this research, 3 models of pillar position were proposed based on the theoritical bond length and applied at hybrid with n=3-4. The first model was both amine groups intercalated with equatorial-equatorial chloride ions on inorganic layers. The second one was both amine groups on axial-axial chloride ion, and the third was intercalated on equatorial-axial. We prepared the 𝐻𝐻3𝑁𝑁 − (𝐶𝐶𝐻𝐻2)3 −𝑁𝑁𝐻𝐻3.𝐶𝐶𝐶𝐶𝐶𝐶𝑙𝑙4 hybrid as yellowish crystals with magnetic moment of 2.0 BM, and decomposed at 199,6°C. Based on elemental analysis, the Carbon, hydogen and nitrogen content were 12,76%, 4,26% and 10,14% respectively, fit for (𝐶𝐶3𝐻𝐻12𝑁𝑁2).𝐶𝐶𝐶𝐶𝐶𝐶𝑙𝑙4 or 1,3-diaminopropane.𝐶𝐶𝐶𝐶𝐶𝐶𝑙𝑙4. The average interlayer distance (d-spacing) hybrid is 9,1 Å, larger than the same hybrid with n=2. When we prepared 𝐻𝐻3𝑁𝑁 − (𝐶𝐶𝐻𝐻2)4 − 𝑁𝑁𝐻𝐻3.𝐶𝐶𝐶𝐶𝐶𝐶𝑙𝑙4, two different compounds were formed in one batch which indicated by green and yellowish color. The green product has a molecular formula of (𝐶𝐶4𝐻𝐻14𝑁𝑁2).𝐶𝐶𝐶𝐶𝐶𝐶𝑙𝑙4 or 1,4-diaminobutane.𝐶𝐶𝐶𝐶𝐶𝐶𝑙𝑙4, paramagnetic with magnetic moment of 1.9 BM, and decomposed at 203.3°C slightly higher than the corresponding hybrid with n=3. Intetestingnlly, its average d-spacing is 9.0 Å, similar with n=3 hybrid, this ffected by structural data on the carbon atoms in organic cation. The organic pillar in 𝐻𝐻3𝑁𝑁 − (𝐶𝐶𝐻𝐻2)𝑛𝑛 − 𝑁𝑁𝐻𝐻3.𝐶𝐶𝐶𝐶𝐶𝐶𝑙𝑙4 hybrid with n=3-4 followed the first model which intercalated in equatorial-equatorial chloride ion of inorganic layers.

Keywords: hybrid, copper (II), organic cation, inorganic layers, d-spacing


196


[ABS-28] Novel Biopolymer electrolyte membranes of 𝑳𝑳𝑻𝑻𝑪𝑪𝑪𝑪𝑻𝑻𝑭𝑭– complexed

Methylcellulose for Lithium-ion Batteries (LIBs) application: Conductivity Studies and Mechanical Properties

Sun Theo Constan Lotebulo Ndruru (a*), Deana Wahyuningrum (b), Bunbun Bundjali (a), I Made Arcana (a**)

(a) Kelompok Keahlian Kimia Fisik dan Anorganik, Institut Teknologi Bandung, Jalan Ganesha 10, 40132

* [email protected] ** [email protected]

(b) Kelompok Keahlian Kimia Organik, Institut Teknologi Bandung, Jalan Ganesha 10, 40132

Abstract

In this work, a preliminary study, we had successfully prepared novel biopolymer electrolyte membranes of lithium perchlorate (𝐿𝐿𝑇𝑇𝐶𝐶𝑙𝑙𝑂𝑂4)-complexed methylcellulose (MC). The complexed-systems functional groups structural, conductivities and mechanical properties were analyzed with fourier transform infrared (FTIR), electrochemical impedance spectroscopy (EIS), and tensile strength measurement, respectively. Methylcellulose, an “intelligent” derivative cellulose, shows attractive properties to develop as biopolymer electrolytes. Bulkier anion size of lithium salt (𝐿𝐿𝑇𝑇𝐶𝐶𝑙𝑙𝑂𝑂4) impacts to enhance biopolymer electrolyte membranes (BEMs) performances meaningfully. BEMs with % weight of 𝐿𝐿𝑇𝑇𝐶𝐶𝑙𝑙𝑂𝑂4 (0, 5, 10, 15, and 20%) were simply prepared by casting solution technique. Incorporation of 10 and 15% weight of 𝐿𝐿𝑇𝑇𝐶𝐶𝑙𝑙𝑂𝑂4 to polymer host MC was selected as good condition, due to display good conductivity of 3.66 x 10-5 and 3.94 x 10-5 S.cm-1, good mechanical properties, ease of preparation and low-cost production. The complexed-system of MC/ 𝐿𝐿𝑇𝑇𝐶𝐶𝑙𝑙𝑂𝑂4 shows sufficient properties to fulfill the requirement as a separator Lithium-ion batteries (LIBs) application.

Keywords: Biopolymer electrolyte; Cellulose; Derivative cellulose; Methylcellulose, lithium-ion batteries


197


[ABS-300] THE SYNTHESIS OF CELLULOSE ACETATE/LITHIUM

ACETATE/CELLULOSE PHTHALATE POLYMER ELECTROLYTE MEMBRANES FOR LITHIUM ION BATTERIES

APPLICATION

Ravensky Yurianty Pratiwi (1), Deana Wahyuningrum (2), I Made Arcana (1)

(1) Inorganic and Physical Chemistry Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

(2) Organic Chemistry Research Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Abstract

Cellulose acetate is a polymer which can be degraded by nature, and has good mechanical properties, but its ionic conductivity is low. The addition of cellulose phthalate can increase its ionic conductivity. The aim of this study is to synthesize polymer electrolyte membranes of cellulose acetate/lithium acetate by adding cellulose phthalate, and perform various characterization such as functional groups analysis, ionic conductivity, mechanical strength, and thermal characterizations for lithium ion battery application. The results of this study showed the optimum mass composition ratio of cellulose acetate/lithium acetate/cellulose phthalate to form polymer electrolyte membrane is 92/5/3 (%w/w). The ionic conductivity, tensile strength, elongation, and the thermal stability of the synthesized membrane are 1.2x10-3 S/cm, 48.62 MPa, 3.25%, and 235 ºC, respectively. Based on the results, it can be concluded that the cellulose acetate/lithium acetate/cellulose phthalate polymer electrolyte membrane is potential to be applied as a polymer electrolyte membrane for lithium ion batteries.

Keywords: cellulose acetate, cellulose phthalate, lithium acetate, polymer electrolyte


198


[ABS-308] Various High Temperature Synthesis of Polyaniline for Dye Sensitized

Solar Cell (DSSC)

Auliya Nur Amalina*, Veinardi Suendo

Inorganic and Physical Chemistry Research Division, Department of Chemistry Faculty of Mathemathics and Natural Sciences, Institut Teknologi Bandung, Indonesia

[email protected]

Abstract

Dye Sensitized Solar Cell is the third generation of Solar Cells. The main component that studied in this research is the counter electrode. Polyaniline (PANI) as a conductive polymers has been used as DSSC counter electrode materials. In this study, the process of PANI synthesis is held at various relatively high temperature, from 273 to 348 K. The sample was characterized by various instruments, the result from FTIR-ATR spectra shown the appearance of new peaks at 1038, 1211, and 1410 cm-1, represent the vibrational modes of phenazine structure at high temperature synthesis of PANI. From Raman Spectroscopy, it was observed the decrease of the intensity ratio of I1194/I1623 that related to the decrease of benzenoid ring that reached minimum at PANI 328 K and the decrease of the amount of secondary amine bond between the benzenoid ring. The conductivity properties of PANI was observed, the highest conductivity properties is found in PANI at 273 K, and tends to decrease and stablized at low conductivity for high temperature synthesis PANI. From the Scanning Electron Microscope, it’s found that the morphology of PANI at low temperature (273 K) is globular shape while at high temperature it tends to form nanorod structure. The DSSC device with PANI counter electrode was tested with Solar Simulator, where resulted the highest efficiency is for PANI at 273 K (1,91%) due to its high conductivity. The lowest efficiency is found in DSSC device with PANI synthesized at 328 K (1,15%) due to its low conductivity because of the highest formation of phenazine structure in PANI 328 K. However, it was observed the efficiency for PANI 348 K was increased (1,59%).

Keywords: Polyaniline (PANI), counter electrode, high temperature, DSSC (Dye Sensitized Solar Cell)


199


[ABS-313] The Effect of Leaf Extract Addition on the Formation of ZnO

Nanoparticles using LASIS Technique

N. Yudasari (a,b*), P. A. Wiguna (b), M. M. Suliyanti (a), V. Fauzia (b), C. Imawan (b)

a) Research Center for Physics - Indonesian Institute of Sciences Kawasan PUSPIPTEK Serpong, 442 Building, South Tangerang 15314, Indonesia

*[email protected] b) Departemen Fisika, FMIPA, Universitas Indonesia, Depok 16424, Indonesia

Abstract

The usage of bio-solution on nanoparticles production is one good alternative to modify the structure of nanoparticles without adding more chemical content. With this idea, the research has been carried out to produce zinc oxide nanoparticles (ZnO NPs) in a plant leaf extract using laser assisted synthesis in solution (LASIS) technique. The pure zinc plat was ablated by Nd:YAG pulse laser in a pometia pinnata or matoa leaf extract. The transmission electron microscope (TEM) images have captured the more disperse and smaller size of ZnO NPs in a colloidal nanoparticle with extract solution, where the size could reduce into less than 40 nm in comparison to those in the neat water. The unique feature was also showed on x-ray diffraction (XRD) result where some zinc peaks(100, 101, 102 and 103) were found together with ZnO peaks on the 2ϴ spectrum. The Zn-ZnO biphase result was considered as the benefit of an incomplete oxidation process, which is very potential for more development in controling Zn and ZnO ratio by varying the leaf extract concentration.

Keywords: ZnO, nanoparticle, LASIS, pometia pinnata, biosynthesis


200


[ABS-156] Esterification of Starch Using Itaconic Anhydride

Dita Rengganis, Rachmawati Rachmawati

Inorganic and Physical Chemistry Division, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia

Corresponding author: [email protected]

Abstract

Chemical modification of starch can be used to refine the properties of starch, such as to ecnhance starch solubility in water. It can be performed via several ways, one of them is via an esterification reaction. In this study, itaconic anhydride is used as an esterfying agent for starch to result in starch itaconate. Itaconate is widely used in food industry as it is known as anti-inflammatory and antibacterial metabolite. The esterification reaction between starch and itaconic anhydride was carried out at 60℃ for 3 hours by varying the ratio between the number of esterifying agent and starch. The resulting products were characterized by FTIR (Fourier-Transform Infrared Spectroscopy), 1H-NMR (Nuclear Magnetic Resonance), SEM (Scanning Electron Microscopy), TGA (Thermogravimetry Analysis), DSC (Differential Scanning Calorimetry), and XRD (X-ray Diffraction). The FTIR results showed that higher amount of itaconic anhydride led to more significant reduction of the vibration peak of hydroxyl group in the starch itaconate. This indicates that some of the hydroxyl groups were substituted by the itaconate groups. The 1H NMR spectrum showed the proton signal of glucose residues at 4-5 ppm and proton signals at 6 ppm for the starch itaconate. The DCS/TGA results exhibited that the starch itaconate showed different thermal properties compared to starch and itaconic anhydride. In addition, the resulting starch itaconate was crystalline material as shown by the XRD result. It was further confirmed by the SEM micrograph which depicted that the starch itaconate formed a block-shaped morphology with a length around 15 μm. These results denote that the starch was successfully esterified using itaconic anhydride.

Keywords: esterified starch, itaconic anhydride, starch


201


[ABS-158] Synthesis and characterization of starch-g-poly(cinnamic acid)

Rachmawati Rachmawati, Midrathul Rahmawati

Inorganic and Physical Chemistry Division, Faculty of Mathermatics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia

Corresponding author: [email protected]

Abstract

Starch as a natural polymer has many advantages as it is considered inexpensive, abundant in nature, and environmental-friendly. Starch can be modified chemically to enhance its properties by adding extra functional groups to its structure. The presence of hydroxyl groups in starch enables it to be used as a backbone molecule for graft copolymerization with other polymers. In this study, the graft copolymerization of starch was conducted by using cinnamic acid as a monomer to result in starch-g-poly(cinnamic acid). Cinnamic acid has antimicrobial and antifungi properties. In addition, the carboxilic group in cinnamic acid can be potentially applied in adsorption or in Enhanced Oil Recovery (EOR). The cinnamic acid polymerization was carried out via radical polymerization using cerium ammonium nitrate (CAN) as an initiator. The result of FTIR analysis on the resulting polymer showed the absorption peak of OH group of starch at a wavelength around 3500 cm-1 and the loss of C = C absorption peak alkene group at wave number 1610–1680 cm-1. In this case, the double bond in cinnamic acid is no longer presence as it forms poly(cinnamic acid). The NMR result showed chemical shift at around 4-5 ppm (RCH=CHR), 5.5–6.5 ppm (H aromatic) and 9.2–10 ppm (RCO2H). The viscosity of the graft copolymer was also measured at temperature range of room temperature to 75°C. The results showed that higher temperature resulted in a decrease in viscosity. The maximum viscosity obtained for the copolymer was 1.55 cP at room temperature (25°C) for the starch-g-poly(cinnamic acid) which was synthesized using 1% CAN with a theoretical degree of polymerization (DPn) of 68. The viscosity was also performed by adding NaOH (16%) into the polymer solution to increase the solubility of the polymer. Furthermore, the viscosity was also measured in a saline solution with a NaCl content of 10%. For the saline solution, the highest viscosity was 1.65 cP at room temperature.

Keywords: cinnamic acid, enhanced oil recovery (EOR), salinity, starch, viscosity


202


[ABS-160] Effect of Ionic Liquids Addition on Electrodeposition Process of Ni-

W/SiC Composite

Cindy Claudia Christanti (a*), Dr. Aep Patah (a)

a) Department of chemistry, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Alloys are often used in industry because has better physical, chemical and mechanical properties than pure metal. Mixtures of Ni and W metals can form superalloys that have good mechanical properties, such as higher than 600 Hv for hardness. It is also found that the hardness, wear resistant and corrosion resistant of Ni-W alloy are much more improved by hard material addition, like SiC or diamond. In this research, Ni-W/SiC composite were synthesized by electrodeposition method with methyltributhylammonium methyl sulphate as electrolyte. We also investigated the effect of addition of imidazole-based ionic liquids, such as 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide (emim NTf2) and 1-butyl-3-methylimidazolium-bis (trifluoromethanesulfonyl) imide (bmim NTf2). Furthermore, the effect of temperature to electrolysis process and the hardness of Ni-W/SiC composite are also examined. Ni-W/SiC composites were characterized using XRD and SEM-EDS instruments, meanwhile the hardness was determined by micro-Vickers method.

Keywords: ni-w/sic, electrodeposition, corrosion resistant, wear resistant, hardness test


203


[ABS-163] Synthesis of Spherical Nanostructured γ-Al2O3 Particles using Cetyltrimethylammonium Bromide (CTAB) Reverse Micelle

Templating

Didi Prasetyo Benu(1) Veinardi Suendo(*1,2) Rino R. Mukti(1,2)

1)Division of Inorganic and Physical Chemistry, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung 40132, Indonesia.

2)Research Center for Nanosciences and Nanotechnology, Institut Teknologi Bandung, Jl. Ganesha No. 10, Bandung 40132, Indonesia.

*Corresponding author: [email protected], [email protected]

Abstract

Gamma alumina (γ-𝑀𝑀𝑙𝑙2𝑂𝑂3) is a material that widely used as a catalyst or catalyst support because its abundant Lewis acid sites. However, conventional γ- 𝑀𝑀𝑙𝑙2𝑂𝑂3 has low surface area and lack of reactant accessibility. Here, we demonstrated synthesis of spherical nanostructured γ- 𝑀𝑀𝑙𝑙2𝑂𝑂3 using reverse micelle templating to enhance surface area and reactant accessibility. We observed the effect of water, CTAB, and urea on morphology, particles size distribution and crystallinity of synthesized particles. We obtained spherical aggregated nanorods of boehmite and γ- 𝑀𝑀𝑙𝑙2𝑂𝑂3 for as-synthesized and calcined products, respectively. In all variation of composition, we obtained spherical nanostructured particles composed by nanorods and nanoplates with difference particles size distribution and crystallinity. The particles size distribution shifted to a larger size in more water and urea content, and shifted to smaller size in more CTAB content. The crystallite size decreased in more water content and increased in more CTAB and urea content. In conclusion, reverse micelle template successfully limits the growth of particles directing formation of spherical nanostructured γ- 𝑀𝑀𝑙𝑙2𝑂𝑂3. Spherical nanostructured γ- 𝑀𝑀𝑙𝑙2𝑂𝑂3 provide potential application as a catalyst or catalyst support due to its closed packed structure, large surface area and high accessibility.

Keywords: boehmite, CTAB; reverse micelle; spherical nanostructured; γ- 𝑨𝑨𝑪𝑪𝑻𝑻𝑻𝑻𝑭𝑭


204


[ABS-250] The Role of MgO as Swelling Cements Admixtures under CO2 Attack

on API Class-G Cement

Juniarto Matasak Palilu (a*), Bambang Soegijono (b)

a)Doctoral Program, Faculty of Mathematics and Natural Science, Universitas Indonesia, Kampus UI, Kota Depok, Jawa Barat 16424

*[email protected] b)Faculty of Mathematics and Natural Science, Universitas Indonesia, Kampus UI, Kota Depok,

Jawa Barat 16424

Abstract

API Class-G Portland cement commonly put in as zonal isolation material in oil and/or gas well. Corrosion against the well zonal isolation material could lead to potential leakage of formation fluid such oil, gas, or water. It is widely known that ordinary Portland cement is thermodinamically unstable in 𝐶𝐶𝑂𝑂2 rich environment, which can be found in the 𝐶𝐶𝑂𝑂2 geological sequestration. 𝐶𝐶𝑂𝑂2 attack on API Class-G cement had been observed through experiments that simulate the down hole condition of Geological Sequestration of 𝐶𝐶𝑂𝑂2. Some of the experiment reveal the detrimental effect of 𝐶𝐶𝑂𝑂2 such as increase of porosity and permeability of cement sheath corroded by 𝐶𝐶𝑂𝑂2 attack. The degradation of API Class-G cement by 𝐶𝐶𝑂𝑂2 involves emergence and crystallization of 𝐶𝐶𝑁𝑁𝐶𝐶𝑂𝑂3 from 𝐶𝐶𝑁𝑁(𝑂𝑂𝐻𝐻)2 which is formed during hydration of cement. In this experiment, we examine the role of addition of 𝑀𝑀𝑀𝑀𝑂𝑂 swelling cement by weight fraction to mitigate the corrosion caused by 𝐶𝐶𝑂𝑂2 against downhole hardened API Class-G cement thus inhibits the occurrence of leakage path of 𝐶𝐶𝑂𝑂2. Observation for characterization and analysis by XRD, optical microscope, and cement paste uniaxial volumetric expansion presented in this paper. The conclusion will provide insights into design of carbonation resistant cement slurries using swelling cements admixtures.

Keywords: Portland Cement, Swelling Cement, 𝑪𝑪𝑻𝑻𝑻𝑻 Attack, Carbonation, 𝑴𝑴𝑴𝑴𝑻𝑻


205

Topic: Mathematics

[ABS-260] Parameter Estimations of Fuzzy Forced Duffing Equation: Numerical

Performances by Extended Runge-Kutta Method

Muhammad Ahsar Karim (a*), Agus Yodi Gunawan (b), Mochamad Apri (b), Kuntjoro Adji Sidarto (b)

a) Program of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Lambung Mangkurat, Indonesia

* [email protected] b) Department of Mathematics, Faculty of Mathematics and Natural Sciences,

Institut Teknologi Bandung, Indonesia

Abstract

In general, most of systems biology may contain uncertainties, either on structures or parameters. These uncertainties are possibly either due to limitations of available data, complexity of the systems, or environmental or demographic changes. One of typical behavior that commonly appears in the systems biology is a periodic behavior. Mathematical model of the system with periodic behavior often exhibit complex dynamic behaviors, depending on the initial values and parameters. By accommodating uncertainties in the model, it certainly requires an intensive study in terms of mathematical structures descriptions, methodologies for determining solutions and procedures for parameter estimations. One of the mathematical models that describes periodic behavior is the Duffing equation. In this work, the Duffing equation will be considered as our subject by assuming that the initial value has uncertainty in terms of Fuzzy Number, and in the presence of an external force. The resulted fuzzy models will be studied by three fuzzy differential approaches, namely Hukuhara Differential and its generalizations, and Fuzzy Differential Inclusions. Applications of Fuzzy Arithmetic to the model lead us into Alpha-Cut Deterministic Systems, with some additional equations. These systems are then solved by Extended Runge-Kutta Method. In contrast to the standard Runge-Kutta Method, the extended Runge-Kutta method utilizes new parameters in order to enhance the order of accuracy of the solutions by including both function and its first derivative values in the calculations. Among those fuzzy approaches, Fuzzy Differential Inclusions is the most appropriate approach to capture periodic behaviors of the model. Finally, we demonstrate how to estimate parameters using Fuzzy Differential Inclusions to our generated fuzzy simulation data.

Keywords: Fuzzy forced duffing equation, Hukuhara differential, fuzzy differential inclusions, extended Runge-Kutta method, parameter estimation


206

Topic: Mathematics

[ABS-261] Subtractive 𝝓𝝓-Weakly Prime Ideal in Semiring

Hadi Prasetyo

Department of Mathematics, Faculty of Mathematics and Natural Sciences, Brawjiaya University, Jalan Veteran, Malang 65145, Indonesia

[email protected]

Abstract

Let 𝑆𝑆 be a semiring. In this paper, we define subtractive 𝜙𝜙 - weakly prime ideal in semiring and prove some results analogous to weakly prime ideal in semiring theory, including the fact that if is subtractive 𝜙𝜙 - weakly prime ideal in semiring 𝑆𝑆 then 𝑃𝑃 ⊆ nil 𝑆𝑆.

Keywords: Semiring, Subtractive ideal, Prime ideal, Weakly prime ideal, 𝝓𝝓 - Prime ideal

[ABS-11] The Boundedness of Fractional Integral Operators on Morrey Spaces

over Hypergroups

Idha Sihwaningrum, Sri Maryani, Ari Wardayani

Jenderal Soedirman University

Abstract

We establish here the boundedness of fractional integral operators on Morrey spaces over commutative hypergroups. The proof of this boundedness needs an assumption that the measure of a ball is equal to the n-th power of the radius of the ball. Furthermore, we also prove the boundedness of the same operator on weak Morrey spaces over commutative hypergoups.

Keywords: commutative hypergroups, fractional integral operators, Morrey spaces, weak Morrey spaces


207

Topic: Mathematics

[ABS-265] Model of Deposit and Loan of a Bank Using Spiral Dynamics

Optimization Method

Moch Fandi Ansori(*), Kuntjoro Adji Sidarto, Novriana Sumarti

Departement of Mathematics, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

As a financial intermediary, banks receive deposits from customers and make them into loans. In the banks balance sheet, the written amount of deposits is not reduced even though some portion of its value is transformed as loans. Therefore, we assume that the growth of deposits follows the logistic growth model. Meanwhile, the size of loans depends on deposits. Thus, we assume loans follow the predator model where the deposits are as the preys. Given the Banks limitations in accepting deposits and channeling loans, we assume that there is a carrying capacity for each deposits and loans. Then, this dynamical system is implemented into data of four of group of banks in Indonesia based on their capital. From the model for each group of banks, the parameters are estimated using the Spiral Dynamics optimization method. First, we do scaling the variables in order to maintain the big difference in magnitudes among variables and parameters, and then we estimate the parameters. We analyzed the model whether its equilibrium points are stable or not. This stability could interpret relating to the stability of deposits and loans of the bank.

Keywords: model of deposit and loan of a bank; estimating parameters; spiral dynamics optimization


208

Topic: Mathematics

[ABS-16] A Bitcoin Mining Project using Real Option

Novriana Sumarti*, Syifa A. Listia

Industrial and Financial Mathematics Research Division, Institut Teknologi Bandung, Jalan Ganesha 10 Bandung 40132

*[email protected]

Abstract

Created in 2009 by a person using an alias name Satoshi Nakamoto, Bitcoin is a new currency where its transactions are made without any intermediatary including banks. Bitcoins can be used not only to buy things and services, but also can be traded. Similar to golds, they have price themself that is increasing from time to time. In July, a bitcoin worths IDR 93,000,000 or USD 6,457. There is no phisical form of this coin so the owners have digital wallet to save it in their computer hardware. The ownership of keys for accessing an occuring transaction is the only prerequisite to use the bitcoin so the full control is in the owner’s hand. Like gold that should be mined from the earth, Bitcoin cannot be created arbitrarily and must be mined via digital means. There are some rules and restrictions that limit the amount of new Bitcoin can be mined. This research proposes methods in evaluation of Bitcoin Mining project using Real Option. In evaluating a project not yet being run, there is opportunity made available to managers of the company to expand or abandon the project if some particular conditions would occur in the time period being projected. The methods are based on Binomial Tree with varying time and Trinomial Tree with varying volatility. Using real data of Bitcoin prices for evaluating project for 1 year, we conclude that the project with Real Option methods can maximize the value of the project, whether the prices of Bitcoin are simulated in bullish, bearish and sideways conditions.

Keywords: Cryptocurrency, Binomial and Trinomial Trees, Learning Options, Blockchain


209

Topic: Mathematics

[ABS-272] On The Total Vertex Irregularity Strength of Some Graphs Obtained

from Star

Rismawati Ramdani, A.N.M. Salman, Hilda Assiyatun

1. UIN Sunan Gunung Djati Bandung 2. Institut Teknologi Bandung

Abstract

Let 𝐺𝐺 = (𝑉𝑉(𝐺𝐺),𝐸𝐸(𝐺𝐺)) be a graph and 𝑘𝑘 be a positive integer. A total 𝑘𝑘-labeling of 𝐺𝐺 is a map 𝑓𝑓: 𝑉𝑉(𝐺𝐺)∪ 𝐸𝐸(𝐺𝐺) → {1,2, … ,𝑘𝑘}. The edge weight 𝐶𝐶𝑢𝑢 under the labeling 𝑓𝑓 is denoted by 𝑤𝑤𝑒𝑒(𝐶𝐶𝑢𝑢) and defined by 𝑤𝑤𝑒𝑒(𝐶𝐶𝑢𝑢) = 𝑓𝑓(𝐶𝐶) + 𝑓𝑓(𝐶𝐶𝑢𝑢) + 𝑓𝑓(𝑢𝑢). The vertex weight 𝑢𝑢 under the labeling 𝑓𝑓 is denoted by 𝑤𝑤𝑒𝑒(𝑢𝑢) and defined by 𝑤𝑤𝑒𝑒(𝑢𝑢) = 𝑓𝑓(𝑢𝑢) + ∑ 𝑓𝑓(𝐶𝐶𝑢𝑢)𝑢𝑢𝑢𝑢∈{𝐸𝐸(𝐺𝐺)} . The total vertex irregularity strength of 𝐺𝐺, denoted by 𝑡𝑡𝑢𝑢𝑡𝑡(𝐺𝐺), is the minimum 𝑘𝑘 such that 𝐺𝐺 has a vertex irregular total 𝑘𝑘-labeling. In this paper, we determine the total vertex irregularity strength some graphs obtained from star.

Keywords: star, the total vertex irregularity strength, vertex irregular total labeling


210

Topic: Mathematics

[ABS-17] Implementation of Fuzzy Linear Programming on Estimating

Production Cost of Petroleum Refineries

Novriana Sumarti*, Diaz F. Ilmi

Industrial and Financial Mathematics Research Division, Institut Teknologi Bandung, Jalan Ganesha 10 Bandung 40132

*[email protected]

Abstract

In Fuzzy logic, an approach is developed to compute based on degrees of truth, valued in interval [0,1], which is different from the usual true (1) or false (0) Boolean logic on which the modern computer is based. Having developed firstly by Dr. Lotfi Zadeh in the 1960s, the approach is implemented in computer for understanding of the natural language, which mostly cannot be easily translated into the absolute terms of 0 and 1. In Fuzzy Linear Programming, the constraints of the system being optimized are installed some fuzziness so that the solution of the system is improved accordingly with the desired conditions. The method is implemented into a system of linear equations that estimate the production cost of a petroleum refiniries with allocation of 𝐶𝐶𝑂𝑂2. We put a new requirement on lower cost of production from the solution of the original Linear Programming problem, and we simulate the fuzzyness of 20%, 50% and 75% tolerances which are implemented on the constraints of the system. It shows that the new solution improve the results without abandoning the need of good allocation of 𝐶𝐶𝑂𝑂2.

Keywords: Fuzzy Logic, Optimization, Linear Programming, Petroleum Refineries Problem


211

Topic: Mathematics

[ABS-273] Claim IBNR Estimation Using GLM Approached by Tweedie

Distribution

Media Rahmawati(1), Isnani Darti(2), Marjono(3)

Brawijaya University

Abstract

Claim reserves are future obligations of a non-life insurance company classified as liabilities. The outstanding claim reserve is unknown until fully settled. The company needs to estimate the total amount of fund in order to meet its liability. A claim that occurred but has not yet settled or reported (IBNR) is total debt owned by the company to valid claimants who have covered loss but it has not reported yet. The accuracy of IBNR value estimation plays an important role because it affects company’s stability. The goal of the current study is to analyze the performance of claim IBNR estimation. We use secondary data taken from [1]. We use several methods to estimate claim, they are chain-ladder whose tail factor determined using Sherman method, Mack’s chain-ladder, and GLM approached by Tweedie distribution. The chain ladder, the most widely used method for claim reserves, only produces an estimation of claim IBNR. In contrast, Mack’s and GLM are able to show estimations and their variation in every development year. Results show the estimation among of all methods including result from [1] slightly difference.

Keywords: Claim Reserve, IBNR, Chain Ladder-Sherman, Macks, GLM, Tweedie Distribution


212

Topic: Mathematics

[ABS-274] On The Total Edge Irregularity Strength of Some Copies of Books

Graphs

Rismawati Ramdani, A.N.M. Salman, Hilda Assiyatun

1. UIN Sunan Gunung Djati Bandung 2. Institut Teknologi Bandung

Abstract

Let 𝐺𝐺 = (𝑉𝑉(𝐺𝐺),𝐸𝐸(𝐺𝐺)) be a graph and 𝑘𝑘 be a positive integer. A total 𝑘𝑘-labeling of 𝐺𝐺 is a map 𝑓𝑓: 𝑉𝑉(𝐺𝐺) ∪ 𝐸𝐸(𝐺𝐺) → {1,2,⋯ ,𝑘𝑘}. The edge weight 𝐶𝐶𝑢𝑢 under the labeling 𝑓𝑓 is denoted by 𝑤𝑤𝑒𝑒 (𝐶𝐶𝑢𝑢) and defined by 𝑤𝑤𝑒𝑒 (𝐶𝐶𝑢𝑢) = 𝑓𝑓(𝐶𝐶) + 𝑓𝑓(𝐶𝐶𝑢𝑢) + 𝑓𝑓(𝑢𝑢). A total 𝑘𝑘-labeling of 𝐺𝐺 is called edge irregular if there are no two edges with the same weight. The total edge irregularity strength of 𝐺𝐺, denoted by 𝑡𝑡𝑒𝑒𝑡𝑡(𝐺𝐺), is the minimum 𝑘𝑘 such that 𝐺𝐺 has an edge irregular total 𝑘𝑘-labeling. The labeling was introduced by Bac ̌a, Jendrol ̌, Miller, and Ryan in 2007. In this paper, we determine the total edge irregularity strength of some copies of book graphs

Keywords: book, the total edge irregularity strength, total edge irregular total labeling

[ABS-20] Simulation of Drift Diffusion Process in A p-n Junction System

Edi Cahyono, Ismail Rahim, I Nyoman Sudiana, Rasas Raya

Universitas Halu Oleo

Abstract

This paper discusses a p-n junction system. The system consists of Poisson equation, drift diffusion equation and continuity equation. The system of equations is solved numerically by considering various initial and boundary conditions. The numerical results and the analysis are presented. This will be important to understand the p-n junction system better, where p-n junction is one of the basic in the modern electronic devices.

Keywords: Numerical simulation; Drift diffusion; PN junction


213

Topic: Mathematics

[ABS-276] THE MULTISET DIMENSION OF CIRCULANT GRAPH

Presli Bintang Mulia S , Rinovia M.G. Simanjuntak


Abstract

Let 𝐺𝐺 be a connected graph and 𝑢𝑢 and 𝐶𝐶 be vertices in 𝐺𝐺. The distance between 𝐶𝐶 and 𝑢𝑢 is the minimum length of paths connecting 𝐶𝐶 and 𝑢𝑢. Suppose that 𝑊𝑊 ={𝑤𝑤1,𝑤𝑤2, . . . ,𝑤𝑤𝑘𝑘} is a subset of vertices in 𝐺𝐺 and 𝑢𝑢 is a vertex in 𝐺𝐺. The representation multiset of 𝑢𝑢 with respect to 𝑊𝑊 is defined as a multiset of distances between 𝑢𝑢 and the vertices in 𝑊𝑊, denoted by 𝑟𝑟𝑚𝑚(𝑢𝑢|𝑊𝑊). If 𝑟𝑟𝑚𝑚(𝑢𝑢|𝑊𝑊) ≠ 𝑟𝑟𝑚𝑚(𝐶𝐶|𝑊𝑊) for every pair of distinc vertices 𝐶𝐶 and 𝑢𝑢, then 𝑊𝑊 is called a multiset basis. If 𝐺𝐺 has a multiset basis, then its cardinality is called multiset dimension of 𝐺𝐺, denoted 𝑚𝑚𝑑𝑑(𝐺𝐺) otherwise is said to have infinite multiset dimension. For integers, the circulant graph 𝐶𝐶𝑛𝑛(1,2,3, . . . , 𝑡𝑡) is graph with vertices 𝑢𝑢0, 𝑢𝑢1, . . . ,𝑢𝑢𝑛𝑛 and 𝑢𝑢𝑖𝑖 is adjacent with 𝑢𝑢𝑖𝑖−𝑡𝑡(𝑚𝑚𝑚𝑚𝑑𝑑)𝑛𝑛,𝑢𝑢𝑖𝑖−(𝑡𝑡+1)(𝑚𝑚𝑚𝑚𝑑𝑑)𝑛𝑛, . . . ,𝑢𝑢𝑖𝑖+(𝑡𝑡−1)(𝑚𝑚𝑚𝑚𝑑𝑑)𝑛𝑛, 𝑢𝑢𝑖𝑖+𝑡𝑡(𝑚𝑚𝑚𝑚𝑑𝑑)𝑛𝑛. In this talk, we present the multiset dimension of circulant graphs.

Keywords: multiset dimension, circulant graphs


214

Topic: Mathematics

[ABS-24] On size multipartite Ramsey numbers for 𝒎𝒎𝒎𝒎𝒎𝒎,𝑷𝑷 versus 𝒎𝒎𝒎𝒎,𝑭𝑭

Anie Lusiani, Edy Tri Baskoro, Suhadi Wido Saputro

Combinatorial Mathematics Research Group Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jl. Ganesa 10 Bandung 40132, Indonesia

Abstract

For simple graphs 𝐺𝐺 and 𝐻𝐻 the size multipartite Ramsey number 𝑚𝑚𝑗𝑗(𝐺𝐺,𝐻𝐻) is the smallest natural number 𝑡𝑡 such that any arbitrary red-blue coloring on the edges of the complete balanced multipartite graph 𝐾𝐾𝑗𝑗×𝑡𝑡 contains a red 𝐺𝐺 or a blue 𝐻𝐻 as a subgraph. Hattingh and Henning (1998) gave the results for the size bipartite Ramsey numbers of stars versus paths, 𝑚𝑚2(𝐾𝐾1,𝑚𝑚,𝑃𝑃𝑛𝑛) for 𝑚𝑚,𝑛𝑛 ≥ 2. In 2016, we have derived the size tripartite Ramsey numbers 𝑚𝑚3(𝑚𝑚𝐾𝐾1,𝑛𝑛,𝑃𝑃3) for 𝑚𝑚 ≥ 1,𝑛𝑛 ≥ 2 where 𝑚𝑚𝐾𝐾1,𝑛𝑛 is a disjoint union of 𝑚𝑚 copies of a star 𝐾𝐾1,𝑛𝑛 and 𝑃𝑃3 is a path of order 3. In this paper, we determine the size multipartite numbers 𝑚𝑚𝑗𝑗(𝑚𝑚𝐾𝐾1,𝑛𝑛,𝐾𝐾1,3) for all integers 𝑚𝑚, 𝑛𝑛 ≥ 2 and 𝑗𝑗 ≥ 3.

Keywords: size multipartite Ramsey number, star


215

Topic: Mathematics

[ABS-26] Bayesian Quantile Regression Method to Construct the Low Birth

Weight Model

Ferra Yanuar, Catrin Muharisa, Dodi Devianto, Arrival Rince Putri, Yudiantri Asdi

Mathematics Department, Andalas University, Kampus Limau Manis Padang, Indonesia

Abstract

This study aims to implement Bayesian quantile regression method in constructing the model of Low Birth Weight. The data of Low Birth Weight is violated of nonnormal assumption for error terms. This study considers quantile regression model and use Gibbs sampling algorithm from Bayesian approach for fitting the quantile regression model. This study explores the performance of the asymmetric Laplace distribution for working likelihood in posterior estimation process. This study also compare the result of quantile regression and Bayesian quantile regression at selected quantile. This study. proved that Bayesan quantile method produced better model than just quantile approach. Bayesian quantile method proved that it can handle the nonnormal problem although using moderate size of data.

Keywords: Bayesian quantile regression, Low Birth Weight, asymmetric Laplace distribution, posterior distribution


216

Topic: Mathematics

[ABS-284] On The Centroidal Dimension of Join and Corona Product Graphs

Rinovia Simanjuntak and Tamaro Nadeak

Combinatorial Mathematics Research Group, Institut Teknologi Bandung, Indonesia

Abstract

For a connected graph 𝐺𝐺, let 𝐵𝐵 = {𝑤𝑤1,𝑤𝑤2, . . . ,𝑤𝑤𝑘𝑘} ⊆ 𝑉𝑉(𝐺𝐺) be a set of vertices, and 𝑥𝑥 be any vertex in 𝐺𝐺. We denote 𝑟𝑟(𝑥𝑥) as an ordered partition of 𝐵𝐵, that is a list of subsets of 𝐵𝐵 in non-decreasing order by their distance from 𝑥𝑥. A vertex set 𝐵𝐵 is called a centroidal locating set of 𝐺𝐺 if 𝑟𝑟(𝑥𝑥) ≠ 𝑟𝑟(𝑦𝑦) for every pair (𝑥𝑥,𝑦𝑦) of distinct vertices. A centroidal basis of 𝐺𝐺 is a centroidal locating set of minimum cardinality. The centroidal dimension of 𝐺𝐺, denoted by 𝐶𝐶𝐶𝐶(𝐺𝐺), is the cardinality of centroidal basis of 𝐺𝐺. In this talk we discuss sharp upper and lower bounds for the centroidal dimension of join and corona products of two graphs. We also present conditions for graphs that satisfy those bounds and investigate the centroidal dimension if one of the graphs is a complete graph.

Keywords: Metric dimension, centroidal dimension, join, corona product


217

Topic: Mathematics

[ABS-30] A Kaldor model for economic cycle: Data fitting

Edi Cahyono, Mahmun Ainullah, La Ode Saidi, Makkulau, Norma Muhtar

Universitas Halu Oleo

Abstract

The words business cycle was firstly used about 1858. Business cycle or economic cycle has attracted economicts, and also mathematicians to study. Economic cycle of a nation is defined as the downward and upward movement of its gross domestic product (GDP) around its long-term growth trend. This paper discusses Kaldor model, a model of business cycle. The model considers variables: productions, capital, investment and saving. Mathematical type of functions related to prospensity to invest and prospensity to save are investigated. Data fitting of Indonesia national income, capital, investment and saving are conducted for the model.

Keywords: Kaldor model; business cycle; data fitting

[ABS-288] Remarks on Multiplicative Generalized Derivations in 3-Prime Near-

Rings

Mochammad Reza Habibi, Dian W. S.

ITS

Abstract

Given 𝑁𝑁 a 3-prime near-ring. A mapping 𝐹𝐹:𝑁𝑁 → 𝑁𝑁 is a multiplicative generalized derivation on 𝑁𝑁 if there exist a multiplicative derivation 𝑑𝑑 such that 𝐹𝐹(𝑥𝑥𝑦𝑦) =𝑥𝑥𝑑𝑑(𝑦𝑦) + 𝐹𝐹(𝑥𝑥)𝑦𝑦 for all 𝑥𝑥, 𝑦𝑦 ∈ 𝑁𝑁. In the present paper, we investigate commutativity of 3-prime near-ring and we show main results for 𝑁𝑁 is considered to be a commutative ring if 𝑁𝑁 admits a certain multiplicative generalized derivation. Moreover we also show the existence of multiplicative generalized derivation if 𝑁𝑁 is 2-torsion free.

Keywords: 3-prime near-ring, multiplicative generalized derivation, 2-torsion free


218

Topic: Mathematics

[ABS-31] MODELING HOT WATER BATH TREATMENT OF TROPICAL

FRUIT USING LATERAL METHODS OF LINES

A.D. Garnadi (a); Prasetyaning Diah R.L. (b*)

a) Department of Mathematics, Bogor Agricultural University, Bogor, Indonesia; b) The Agency for the Assessment and Application of Technology, South Tangerang, Indonesia.

*[email protected]

Abstract

One of essential procedure nowadays to analyze a dynamic process in Science and Engineering is Computational modeling. Most of dynamic processes are distributed parameter systems, i.e., systems with state variables depend on the number of independent variables (such as space and time) which are expressed by a set of partial differential equations (PDEs). Lateral method of lines is a method which used for solving PDEs numerically by solving a set of boundary value problems sequentially. The aim is to report the development of PDE toolbox based on Scilab. This paper provides users with a method that is very easy to understand in the applications related to dynamic process. The method uses a Scilab template to develop numerical simulations in the new field. In this paper, a model of tropical fruit heat treatment for decimating insect is presented. The illustration will be given to show how the lateral method of line template works to solve the problem.

Keywords: Lateral method of lines; Scilab; Simulation model


219

Topic: Mathematics

[ABS-33] Optimal Control of Drug Therapy and Virotherapy via Linear

Parameter Varying (LPV) Approach

Dianita Putri Army (*), Roberd Saragih, Dewi Handayani

Department of Mathematics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia

*[email protected]

Abstract

Cancer is one of the biggest causes of death in the world, including in Indonesia and there is not yet found specific drugs to cure cancer. Treatment using drugs is one of therapies that can be used to treat cancer patients, but at the same time, it has side effect which is affecting healthy cells, resulting problem such as muscle, kidney, or fertility problems. Therefore, virotherapy is introduced as alternative cancer therapy by utilizing oncolytic virus as a weapon to damage cancer cells without harming healthy cells. Nonlinear model of cancer treatment using combination of drug therapy and virotherapy can describe the dynamics of cancer treatment phenomenon. From the model, drug therapy and virotherapy will be assigned as control that will minimize the side effect of therapy. Here we discuss Linear Parameter Varying (LPV) as an approach to determine the control input with a set of parameters that vary in specific interval. Numerical simulation shows that dynamical behavior of LPV model is similar with nonlinear model. From LPV controller, it can be obtained the dosage of drugs and virotherapy to minimize the growth of cancer cells. Furthermore, LPV model can interprets less complex and is more useful since it relates to the desired trajectory and can generates the unseen time variation.

Keywords: Optimal Control; Linear Parameter Varying; Cancer; Virotherapy


220

Topic: Mathematics

[ABS-289] Introducing Fermat Sequences

Ridlo W. Wibowo (*1, 2)

1) Astronomy Department, Institut Teknologi Bandung, Bandung, Indonesia *[email protected]

2) European Southern Observatory, Santiago, Chile

Abstract

The number of iteration used in the Fermats factorization method is related to the factor that the method found for each odd number. A new group of sequence (we called it Fermats sequences) can be generated based on the factor that we found using this method. For example, the first member (𝐹𝐹[1]) in this "group of sequence" is odd prime number sequence, which has factor--of course--of 1 and has highest number of iteration in the Fermats factorization, which is ~half of the number itself. The next member is always composite number with interesting structure and also randomness related to the prime number distribution. First exploration of these new sequences (not registered in oeis.org yet) and the beauty of the location of these sequences in the Ulams and Sacks spiral will be presented.

Keywords: Fermats factorization method; new sequence of integers; prime number


221

Topic: Mathematics

[ABS-34] Angle between Two Images of the Same Size

Grace Reni Agustina, Agah D. Garnadi

Bogor Agricultural University

Abstract

A digital image consisting of (m, n) pixels, can be represented as a real matrix of size (m, n) for black-and-white images or a tensor of size (m, n, 3) with the entry of real number for color images with RGB scale. In text-mining, such as in search engines, basic concept of Linear Algebra such as angle between two vector, often used to measure how close the search vector is relative to the corpus. Based on the basic concept of Linear Algebra that has been used, we developed a method to detect whether there are significant differences between two compared images. A model where the image is represented as a matrix, the difference of two images can be matched by determining the angle between two subspaces generated by the column of both matrix of the compared images, and row sub-space likewise. The proposed numerical procedure for calculating the angles between subspaces is based on to the formula of the angle between two subspaces.

Keywords: angle, application of linear algebra, images as matrix, matrix, subspaces, vector


222

Topic: Mathematics

[ABS-291] THE MINIMAL SIZE OF RAINBOW 3-CONNECTED GRAPH

M.A. Shulhany (a), A.N.M. Salman (b)

a) Departement of Civil Engineering, Faculty of Engineering, Universitas Sultan Ageng Tirtayasa. E-mail: [email protected]

b) Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

Abstract

Let 𝑟𝑟 and 𝑛𝑛 be natural numbers, with 𝑟𝑟 < 𝑛𝑛, and 𝐺𝐺 = (𝑉𝑉(𝐺𝐺),𝐸𝐸(𝐸𝐸)) be a simple, nontrivial, 𝑟𝑟-connected, finite, and undirected graph on 𝑛𝑛 vertices. Let 𝑘𝑘 be a natural number, define an edge 𝑘𝑘-coloring 𝑐𝑐:𝐸𝐸(𝐺𝐺) → [1,𝑘𝑘]. Let 𝐶𝐶,𝑢𝑢 ∈ 𝑉𝑉(𝐺𝐺), an 𝐶𝐶 − 𝑢𝑢 path is called a rainbow path if edges in this path have different colors. Let 𝑙𝑙 be a natural number with 𝑙𝑙 ≤ 𝑟𝑟, 𝑘𝑘-coloring 𝑐𝑐 is called 𝑙𝑙-rainbow 𝑘𝑘-coloring, if for any two distinct vertices 𝐶𝐶 and 𝑢𝑢 in 𝐺𝐺, there are 𝑙𝑙 internally disjoint 𝐶𝐶 − 𝑢𝑢 rainbow paths. A graph 𝐺𝐺 which has been colored by 𝑙𝑙-rainbow 𝑘𝑘-coloring is called rainbow 𝑙𝑙-connected. The rainbow 𝑙𝑙-connection number, denoted by 𝑟𝑟𝑐𝑐𝑙𝑙(𝐺𝐺), is a minimum natural number 𝑘𝑘 such that 𝐺𝐺 has a 𝑙𝑙-rainbow 𝑘𝑘-coloring.

Furthermore, minimal size of rainbow 3-connected graph with 𝑟𝑟𝑐𝑐3 ≤ 𝑘𝑘 is denoted by 𝑡𝑡3(𝑛𝑛, 𝑘𝑘). In this thesis we determine upper bounds of 𝑡𝑡3(𝑛𝑛,𝑘𝑘) for 𝑘𝑘 ∈ [ 2, ⌊ 𝑛𝑛2 ⌋] or 𝑘𝑘 = ⌈ 𝑛𝑛2 ⌉ and 𝑛𝑛 ≡ 0 (𝑚𝑚𝑚𝑚𝑑𝑑) 4 or 𝑘𝑘 = ⌈ 𝑛𝑛2 ⌉ and 𝑛𝑛 ≡ 3 (𝑚𝑚𝑚𝑚𝑑𝑑) 4 or 𝑘𝑘 = ⌈ 𝑛𝑛2 ⌉ + 1 and 𝑛𝑛 ≥ 10. Additionally, we determine exact value of 𝑡𝑡3(𝑛𝑛,𝑘𝑘) for 𝑘𝑘 ∈ [ ⌈ 𝑛𝑛2 ⌉ +1, 𝑛𝑛 − 1].

Keywords: graph, minimal size of rainbow 3-connected graph, rainbow 3-connected, rainbow path


223

Topic: Mathematics

[ABS-293] The Locating Chromatic Number Of Lobster Graph 𝑳𝑳𝑷𝑷,𝒎𝒎,𝒎𝒎 For 𝒎𝒎 =

𝑭𝑭,𝑭𝑭,𝟓𝟓

Des Welyyanti, Mega Silvia

Universitas Andalas

Abstract

Let 𝐺𝐺 = (𝑉𝑉 ,𝐸𝐸) is a connected graph and 𝑐𝑐 is 𝑘𝑘-coloring of 𝐺𝐺. The color classes of 𝐺𝐺 denoted by 𝑆𝑆𝑖𝑖, is the set of all vertices are colored 𝑇𝑇 for 1 ≤ 𝑇𝑇 ≤ 𝑘𝑘. Let Π = {𝑆𝑆1, 𝑆𝑆2, . . . , 𝑆𝑆𝑘𝑘} be an ordered partition of 𝑉𝑉(𝐺𝐺) be based on a coloring vertex, then the representation of 𝑢𝑢 to Π is called a color code of 𝑢𝑢 is denoted by 𝑐𝑐Π𝑝𝑝(𝑢𝑢). The color code 𝑐𝑐Π(𝑢𝑢) of a vertex 𝑢𝑢 ∈ 𝑉𝑉(𝐺𝐺) is defined as 𝑘𝑘-vector: 𝑐𝑐Π(𝑢𝑢) = �𝑑𝑑(𝑢𝑢, 𝑆𝑆1), 𝑑𝑑(𝑢𝑢, 𝑆𝑆2), . . . ,𝑑𝑑(𝑢𝑢, 𝑆𝑆𝑘𝑘)�, where 𝑑𝑑(𝑢𝑢, 𝑆𝑆𝑖𝑖) = 𝑚𝑚𝑇𝑇𝑛𝑛 {𝑑𝑑(𝑢𝑢, 𝑥𝑥|𝑥𝑥 ∈ 𝑆𝑆𝑖𝑖)} for 1 ≤ 𝑇𝑇 ≤ 𝑘𝑘. If every vertices in 𝐺𝐺 has different color code for a Π, then 𝑐𝑐 is called the locating coloring of 𝐺𝐺. The minimum of the number of colors used in the locating coloring of graph 𝐺𝐺 is called the location chromatic number of 𝐺𝐺 denoted by 𝜒𝜒𝐿𝐿(𝐺𝐺). Graf Lobster is a graph obtained by adding one vertex of earrings to a caterpillar graph of degree 1. Lobster graph is denoted by 𝐿𝐿(𝑚𝑚,𝑛𝑛,𝑘𝑘) for 𝑚𝑚 ≥ 1 and 𝑛𝑛 ≥ 2, where 𝑛𝑛 is the number of vertex on the main path, 𝑚𝑚 is the number of vertex spaced 1 of the main path, 𝑘𝑘 is the number of vertex spaced 2 of the main path. In this paper, we determine the locating chromatic number of lobster graph 𝐿𝐿𝑛𝑛,𝑚𝑚,1 for 𝑚𝑚 = 3,4,5.

Keywords: color class, color code, locating chromatic number, lobster graph


224

Topic: Mathematics

[ABS-41] Unicyclic Ramsey (P3,Pn)-minimal graphs obtained from trees in the

same class

Desi Rahmadani, Hilda Assiyatun, Edy Tri Baskoro


Abstract

Let F, G and H be graphs. We write F→(G,H) if in any red-blue coloring of the edges of F, there is a red subgraph isomorphic to G or a blue subgraph isomorphic to H. A graph F is a Ramsey (G,H)-minimal graph if F→(G,H) and F−e↛(G,H), for every e∈E(F). The class of all Ramsey (G,H)-minimal graphs (up to isomorphism) will be denoted by R(G,H).

A pair (G,H) is Ramsey-finite if the set of R(G,H) is finite. Otherwise, the pair (G,H) is called Ramsey-infinite. The characterization of all graphs in the infinite set R(P3,Pn) is still open, for any n≥4. In this paper, we investigate unicyclic graphs in R(P3,Pn), for any n≥5 constructed from trees in the same class.

Keywords: coloring, Ramsey minimal graph, path, unicyclic graph, Ramsey infinite


225

Topic: Mathematics

[ABS-43] The Gram-Schmidt Process on An Indefinite Inner Product Space

Siti Humaira (a*), Pudji Astuti (a)

a) Faculty of Mathematics and Natural Science, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

One generalizations of the inner product is known as the indefinite inner product. The properties of inner product spaces, such as ortogonality can be brought to indefinite inner product spaces, including the Gram-Schmidt process. However, not all linearly independent sets the indefinite inner product spaces can be converted into orthonormal sets. In this presentation, it is shown a necessary and sufficient conditionsatisfied by a linear independent set on an indefinite inner product space in order that the set can be converted into an orthonormal set by utilizing the Gram-Schmidt process.

Keywords: Gram-Schmidt process, indefinite inner product space

[ABS-312] Heat Equation in Cycle Metric Graph

Yulia E. Cahyani*, Yudi Soeharyadi, Janny Lindiarni

Faculty of Mathematic and Natural Science, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

This paper discuss about heat equation in cycle metric graph. All of edges in this graph identified by an interval [0, 𝐿𝐿𝑖𝑖] with 𝑇𝑇 = 1,2,3, . . . ,𝑛𝑛. Heat equation in this graph seen as one dimentional system at each interval with identification at inner vertex. Specially, we will discuss about Neumann and Kirchoff condition, so that solution that we get is weak solution.

Keywords: heat quation, directed cycle graph, metric, weak solution, Neumann and Kirchoff condition


226

Topic: Mathematics

[ABS-46] On the Free Boundary Problem for the Compressible Fluid Flow of the

Oldroyd-B Model with Surface Tension in the Maximal Lp-Lq Regularity Class

Sri Maryani(1), Hendra Gunawan(2), Yoshihiro Shibata(3)

1. Department of Mathematics, Faculty of Mathematics and Natural Sciences Jenderal Soedirman University

2. Department of Mathematics, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology

3. Department of Pure and Applied Mathematics, Graduate School of Fundamental Sciences and Engineering, Waseda University Japan

Abstract

We investigated the local in time unique existence theorem for the free boundary problem of compressible viscous barotropic fluid flow of the Oldroyd-B model with surface tension in a bounded domain of N-dimensional Euclidean space (N ≥2). The essential step is to prove the maximal Lp-Lq theorem for the linearized equation. This tool plays the essential role to prove not only local well-posedness but also global well-posedness. The equation system is transformed from Ω𝑡𝑡 to fixed domain Ω by using Hanzawa transformation.

Keywords: local in time unique existence, Oldroyd-B model, surface tension, free boundary problem, maximal 𝑳𝑳𝒑𝒑-𝑳𝑳𝒒𝒒 regularity, Hanzawa transformation


227

Topic: Mathematics

[ABS-47] Generalized STAR (1;1) Model with Outlier - Case Study of Begal in

Medan, North Sumatera

Debby Masteriana(a*), Mila Isti Riani(a), Utriweni Mukhaiyar(a)

a) Department of Mathematics, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

This study is aimed to compare the model of generalized space time autoregressive (GSTAR) (1;1) and GSTAR (1;1) with outlier. A case study is done toward the amount of monthly crime activity-begal at seven police sector in Medan, North Sumatera. By using three steps of Box-Jenkins, Autoregressive (AR) (1) model is applied to whole locations and shows that in fifth location – West Medan, there is additive outlier (AO) in the third data of time with weight -57.5024. Adding this value to GSTAR (1;1) model means adding outlier factor to the space time model. The result shows that GSTAR (1;1) model has root mean square of error (RMSE) about 11.4645 meanwhile GSTAR (1;1) with outlier model has RMSE about 11.3094. Since the smaller RMSE is found by GSTAR (1;1) model with outlier, then this model is the best model in this case study. This invention shows that the model of space time with outlier model can be used to get precise result rather than use space time model only.

Keywords: GSTAR (1;1), Autoregressive (AR) (1), Additive Outlier (AO), space time, root mean square error (RMSE)


228

Topic: Mathematics

[ABS-48] I-Primal Submodules

Steven

Algebra Research Group, Institut Teknologi Bandung, Ganesha No. 10, Bandung 40132, Indonesia

Abstract

In a module of commutative ring with identity, prime notions of submodule growing vastly. Furthermore, there is a notion of primal submodule. Suppose 𝑁𝑁 be a submodule of 𝑅𝑅-module 𝑀𝑀. An element 𝑟𝑟 of 𝑅𝑅 is called prime to 𝑁𝑁 if 𝑟𝑟𝑚𝑚 ∈ 𝑁𝑁 with 𝑚𝑚 element of 𝑀𝑀 implies 𝑚𝑚 ∈ 𝑁𝑁. The submodule 𝑁𝑁 is called primal if the set of elements which is not prime to 𝑁𝑁 forms an ideal. The generalization of elements which prime to 𝑁𝑁 is arised and called as elements which almost prime to 𝑁𝑁. An element 𝑟𝑟 ∈ 𝑅𝑅 is called almost prime to 𝑁𝑁 if 𝑟𝑟𝑚𝑚 ∈ 𝑁𝑁 − (𝑁𝑁:𝑀𝑀)𝑁𝑁 for 𝑚𝑚 element of 𝑀𝑀 implies 𝑚𝑚 is an element of 𝑁𝑁. In this article, we introduce the generalization of elements which prime to 𝑁𝑁 as elements that 𝐼𝐼-prime to 𝑁𝑁 by changing the set (𝑁𝑁:𝑀𝑀) to an arbitrary ideal of 𝑅𝑅. By this notion, we can generalize primality of submodule 𝑁𝑁 to 𝐼𝐼-primality of submodule 𝑁𝑁. We called 𝑁𝑁 the submodule of 𝑀𝑀 is 𝐼𝐼-primal submodule if the set of elements which 𝐼𝐼-prime to 𝑁𝑁 forms an ideal of 𝑅𝑅. Furthermore, we give some characterizations of 𝐼𝐼-primal submodules and its relation to other prime and primal notions.

Keywords: Primal submodules, I-Primal Submodules, I-Prime submodules


229

Topic: Mathematics

[ABS-304] An Optimal Integrated Vector Control for Prevention the Transmission

of Dengue

Kasbawati(1), Surya Ningsih(1), Agustinus Ribal(1), Fatmawati(2*)

(1) Department of Mathematics, Faculty of Mathematics and Natural Sciences, Hasanuddin University, Jl. Perintis Kemerdekaan Km. 10 Makassar 90245, Indonesia

(2) Department of Mathematics, Faculty of Science and Technology, Universitas Airlangga, Surabaya 60115, Indonesia

*Corresponding author: [email protected]

Abstract

Dengue is a tropical infectious disease caused by dengue virus which is transmitted by mosquitos such as Aedes Aegypti and Aedes Albopictus. The spread of this disease could be controlled by applying some optimal strategies. In this research, we study optimal strategy in controlling the spread of dengue by taking into consideration an integrated vector control strategy. The strategy combines chemical and non-chemical vector control methods to prevent the transmission of vector-borne disease. If we assume that the control functions are constant functions then numerically we obtain a critical chemical control which leads to the non-endemic condition. When the chemical and non-chemical controls are varying in time, we obtain the analytical forms of the both control functions by using Pontryagin Maximum Principle. The numerical simulations are performed using the Steepest Descent method and the results show that the peak of the non-chemical control effect occurs at the end time of the observation. Conversely, the chemical control effect reaches the maximum effect at early of the observation time. We also found that the greater chance of dengue virus transmission, the greater control effort required for preventing the endemic condition in the corresponding system.

Keywords: Dengue, Integrated Vector Management, Basic Reproduction Number, Optimal Control


230

Topic: Mathematics

[ABS-305] Clustering for item delivery and execution

Mokhammad Ridwan Yudhanegara *, Sapto Wahyu Indratno, RR. Kurnia Novita Sari

Institut Tekonologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia *[email protected]

Abstract

In this paper, we introduce an alternative approach as model for cluster analysis. The model assumes that each group of observation in the data set suspected to contain clusters comes from a population with a different probability distribution, is known as a finite mixture density (FMD). By using FMD, we estimated the parameters of the assumed mixture distribution to calculate the posterior probabilities of cluster membership. As an application, we use the simulate of item delivery data to classify items based on destination addresses.The final execution, whether the items will be sent using a motorcycle, a small box car, or a large box car. The clustering can be used as a recommendation to the freight forwarding company.

Keywords: multivariate probability density function


231

Topic: Mathematics

[ABS-50] Bayesian Forecasting for Time Series of Count Data

Rinda Nariswari (a), Yuana Sukmawati(b)

(a)Statistics Department, School of Computer Science, Bina Nusantara University Jl. K.H Syahdan No. 9, Palmerah, DKI Jakarta, 11480, Indonesia

(b)Statistics Department, Faculty of Mathematics and Natural Science, Lambung Mangkurat University

Jl. Brigjend H. Hasan Basry,No.87, Banjarmasin, Indonesia

Abstract

Time series of count data is not a widely studied research topic. This paper develops Bayesian forecasting of counts whose conditional distributions given past observations and explanatory variables follow a Poisson distribution. An effective algorithm is developed in a Bayesian framework for forecasting an observation-driven integer valued autoregressive model when modelling time series count data. In order to achieve this, a particle MCMC algorithm for the autoregressive Poisson regression model is introduced. Two real-life data sets, monthly demand for drugs type X and type Y (2015–2017) are successfully analyzed. We also illustrate that the Bayesian forecasting is more accurate than the corresponding frequentists approach.

Keywords: autoregressive, Bayesian, count data, MCMC


232

Topic: Mathematics

[ABS-307] The Comparison of Laplacian Operators Spectrum between Weighted

Directed and Metric Graphs

Indah Wahyu Utami (a*), Yudi Soeharyadi (a), Janny Lindriani (a)

(a) Departement Mathematics, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

We discuss first two lowest eigenvalues of lapacian operator on weighted directed and metric graphs. On wighted directed graphs, we use equilateral cycle digraph with its weight is 1. Meanwhile on metric graphs, we use cycle graph which each edge are associated with interval [0,1]. From those first two lowest eigenvalues, we get their spectral gap is the second eigenvalue which is not zero. As the result, the comparison of laplacian operators spectrum between weighted directed and metric graphs is the comparison of their second eigenvalue. It is also shown that spectral gap between their second eigenvalue is a litte, almost zero.

Keywords: laplacian operators, eigenvalue, metric graphs, weighted directed graph, cycle graph


233

Topic: Mathematics

[ABS-53] Codes over an Infinite Family of Non-Chain Rings

Yusuf Hafidh, Djoko Suprijanto

Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung, Jalan Ganesa 10 Bandung, Indonesia

Email: [email protected], [email protected]

Abstract

A. Bayram and I. Siap (2013) studied linear codes over the ring 𝑅𝑅3: = ℤ3[𝑢𝑢]/⟨𝑢𝑢3 −𝑢𝑢⟩. Furthermore, Y. Cengellenmis, A. Dertly, and S.T. Dougherty (2014) studied linear codes over the ring 𝑀𝑀𝑘𝑘: = 𝔽𝔽2[𝑢𝑢1,𝑢𝑢2, … ,𝑢𝑢𝑘𝑘] / ⟨ 𝑢𝑢𝑖𝑖2 − 𝑢𝑢𝑖𝑖 ,𝑢𝑢𝑖𝑖𝑢𝑢𝑗𝑗 − 𝑢𝑢𝑗𝑗𝑢𝑢𝑖𝑖 ⟩𝑖𝑖,𝑗𝑗=1𝑘𝑘 . In this talk, we present our preliminary study on linear codes over the ring 𝑀𝑀𝑘𝑘,𝑞𝑞: =𝔽𝔽𝑞𝑞[𝑢𝑢1,𝑢𝑢2, … ,𝑢𝑢𝑘𝑘] / ⟨ 𝑢𝑢𝑖𝑖

𝑞𝑞 − 𝑢𝑢𝑖𝑖 ,𝑢𝑢𝑖𝑖𝑢𝑢𝑗𝑗 − 𝑢𝑢𝑗𝑗𝑢𝑢𝑖𝑖 ⟩𝑖𝑖,𝑗𝑗=1𝑘𝑘 , 𝑞𝑞 is a prime power, which is a generalization of 𝑅𝑅𝑞𝑞 and also 𝑀𝑀𝑘𝑘. The properties of 𝑀𝑀𝑘𝑘,𝑞𝑞 are studied by observing its relationship with 𝔽𝔽𝑞𝑞𝑛𝑛 by the gray map. Some ways of obtaining the generator of ideals in 𝑀𝑀𝑘𝑘,𝑞𝑞 are also studied. Some aspects of linear codes over 𝑀𝑀𝑘𝑘,𝑞𝑞 which we study include self-dual codes, self-ortogoal codes, cyclic codes, and 𝑙𝑙-tuple cyclic codes.

Keywords: Ring 𝑨𝑨𝒌𝒌,𝒒𝒒, gray map, self-dual codes, self-ortogonal codes, cyclic codes, 𝑪𝑪-tuple cyclic codes


234

Topic: Mathematics

[ABS-54] Robust 𝑯𝑯∞ Controller for Bilinear System to Minimize HIV

Concentration in Blood Plasma

Jonathan Saputra (a*), Roberd Saragih (a), Dewi Handayani (a)

a) Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Human Immunodeficiency Virus (HIV) is a type of virus which attacks CD4+ T cells. Insufficient numbers of CD4+ T cells will affect the performance of immunity systems so that someone become more risky to have AIDS or other diseases. HIV phenomenon can be modelled as nonlinear systems, but there is no exact method to solve problems in analyzing nonlinear systems with control treatment. Thus, the nonlinear system is approximated into a bilinear system by using Carleman Bilinearization method. The main concerns of this research are to define a control treatment and analyze the effects of the treatment towards the compartments that defined in the model. Generally, the treatment for HIV is merely to obstruct the replication process. Therefore, the control treatment is defined as the chemotherapy of hypothetical drugs which aimed to clear off the HIV concentration in blood plasma. The complexity of body systems is the reason of using 𝐻𝐻∞ robust controller as control input. From numerical simulation, an individual will experience heavy symptomps if the hypothetical drugs chemotherapy is not given. This finding is strengthening the urgency of robust control input to be given after specific period of waiting time. Based on the numerical simulation with control treatment, bilinear system has trends that give similar interpretation with the trends of nonlinear system. Besides that, 𝐻𝐻∞ robust control on bilinear system has demolishing speed of HIV concentration and infected CD4+ T cells concentration which approximately equal to the demolishing speed from nonlinear system. Therefore, this research concluded that the used of 𝐻𝐻∞ robust control on bilinear system makes the bilinear system approximates the performance of nonlinear system in an effective and representative way.

Keywords: Human Immunodeficiency Virus, Chemotherapy, Nonlinear Systems, Bilinear Systems, Carleman Bilinearization, Robust 𝑯𝑯∞ Control


235

Topic: Mathematics

[ABS-56] A Fuzzy Basic Reproduction Number For A Fuzzy Smoker Growth

Model

Herlinda Nurafwa Sofhya (a*), Agus Yodi Gunawan (a)

a)Department of Mathematics, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Consumption of a large amount of cigarretes in a public society is one of the main concerns in every countries since cigarettes may become the source of all dangerous diseases, like TBC, Cancer and many other health and social problems. Many programs have been simulated by government to overcome smoking problems. One of important things for the goverment is to predict smokers growth population. In this paper, we derive a smoker growth model in which the population is classified by three sub populations: a potential smoker, an active smoker, and a quitted smoker. Commonly, the transmission rate in the classical model is assumed to be constant. However, in reality the transmission among them may depend on age of smoker. To get insight into this, the transmission rate will here be relaxed to be dependence of ages and contain uncertainty that is considered as a triangular fuzzy number. Our main focus will be paid into determination of fuzzy basic reproduction number through fuzzy expected value concept. Using the resulted fuzzy basic reproduction number, we calculate the critical age smoker above which the endemic case takes place. It turns out this critical age is less than that of resulted from the classical (non-fuzzy) basic reproduction number. It means that fuzzy smoker growth model may be considered as an early warning model for the endemic case.

Keywords: Smoker growth model; Triangular fuzzy number; Fuzzy expected value; Basic reproduction number; Endemic


236

Topic: Mathematics

[ABS-57] Linear Codes over 𝑹𝑹 ∶= ℤ𝒑𝒑𝒑𝒑 + 𝑪𝑪ℤ𝒑𝒑𝒑𝒑 + 𝒗𝒗ℤ𝒑𝒑𝒑𝒑 + 𝑪𝑪𝒗𝒗ℤ𝒑𝒑𝒑𝒑

Felita Ariella Mustika, Djoko Suprijanto


Abstract

Recently, Li Ping, Guo Xuemei, Zhu Shixin and Kai Xiaoshan (2017) obtained some results on linear codes over the ring ℤ4 + 𝐶𝐶ℤ4 + 𝑢𝑢ℤ4 + 𝐶𝐶𝑢𝑢ℤ4 where 𝐶𝐶2 =𝐶𝐶,𝑢𝑢2 = 𝑢𝑢, and 𝐶𝐶𝑢𝑢 = 𝑢𝑢𝐶𝐶. Generalizing the results of Ping et.al. (2017), in this talks we present our preliminary study on linear codes over the ring 𝑅𝑅 ∶= ℤ𝑝𝑝𝑠𝑠 + 𝐶𝐶ℤ𝑝𝑝𝑠𝑠 + 𝑢𝑢ℤ𝑝𝑝𝑠𝑠 + 𝐶𝐶𝑢𝑢ℤ𝑝𝑝𝑠𝑠, where 𝑝𝑝 is an arbitrary prime number and 𝑡𝑡 is an arbitrary natural number. The structure of the ring 𝑅𝑅 is studied by using the direct sum decomposition of the ring. The aspects of the linear codes over the ring 𝑅𝑅 that studied here include the MDS codes over the ring 𝑅𝑅, the self-dual codes over the ring 𝑅𝑅, the cyclic, and m-tuple cyclic codes over the ring 𝑅𝑅.

Keywords: Ring (𝑹𝑹 ∶= ℤ𝒑𝒑𝒑𝒑 + 𝑪𝑪ℤ𝒑𝒑𝒑𝒑 + 𝒗𝒗ℤ𝒑𝒑𝒑𝒑 + 𝑪𝑪𝒗𝒗ℤ𝒑𝒑𝒑𝒑), linear codes, MDS codes, self-dual codes, cyclic codes, m-tuple cyclic codes


237

Topic: Mathematics

[ABS-80] The connected size Ramsey numbers for 𝑻𝑻𝒎𝒎𝑻𝑻 versus tree

Budi Rahadjeng, Hilda Assiyatun, Edy Tri Baskoro


Abstract

Let 𝐹𝐹, 𝐺𝐺 and 𝐻𝐻 be finite, simple and undirected graphs. We write 𝐹𝐹 → (𝐺𝐺,𝐻𝐻) to mean that in any red-blue coloring of the edges of 𝐹𝐹 will contain either a red copy of 𝐺𝐺 or a blue copy of 𝐻𝐻. The connected size Ramsey number for a pair of graphs 𝐺𝐺 and 𝐻𝐻 is the smallest integer �̂�𝑟𝑐𝑐 such that there is a connected graph 𝐹𝐹 with �̂�𝑟𝑐𝑐 edges satisfying 𝐹𝐹 → (𝐺𝐺,𝐻𝐻). In this paper, we will determine the connected size Ramsey number �̂�𝑟𝑐𝑐(2𝐾𝐾2,𝐻𝐻), where 𝐻𝐻 = 𝑆𝑆(1,𝑘𝑘) is a graph obtained from subdivided one edge of star 𝐾𝐾1,𝑘𝑘,𝑘𝑘 ≥ 3 or 𝐻𝐻 is a double star 𝑆𝑆𝑛𝑛,𝑛𝑛,𝑛𝑛 ≥ 2.

Keywords: connected size Ramsey number, matching, tree


238

Topic: Mathematics

[ABS-58] Total Vertex Irregularity Strength for Cartesian Product of Stars

Susilawati (a*), Edy Tri Baskoro (a), Rinovia Simanjuntak (a)

(a) Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10 Bandung 40132, Indonesia

*) [email protected]

Abstract

For a simple, connected and undirected graph 𝐺𝐺 = (𝑉𝑉,𝐸𝐸) with non empty vertex set 𝑉𝑉(𝐺𝐺) and edge set 𝐸𝐸(𝐺𝐺). A labeling of graph is an assignment of numbers to the vertex or edges, or both subject to certain condition. We define a labeling 𝜙𝜙 ∶ 𝑉𝑉 ∪ 𝐸𝐸 → {1,2,3, … ,𝑘𝑘} to be a vertex irregular total 𝑘𝑘-labeling of 𝐺𝐺 if for every two different vertices 𝑥𝑥 and 𝑦𝑦 of 𝐺𝐺, their weights 𝑤𝑤(𝑥𝑥) and 𝑤𝑤(𝑦𝑦) are distinct, where the weight 𝑤𝑤(𝑥𝑥) of a vertex 𝑥𝑥 ∈ 𝑉𝑉 is 𝑤𝑤(𝑥𝑥) = 𝜙𝜙(𝑥𝑥) + ∑ 𝜙𝜙(𝑥𝑥𝑦𝑦)𝑥𝑥𝑥𝑥∈𝐸𝐸(𝐺𝐺) . The minimum 𝑘𝑘 for which the graph 𝐺𝐺 has a vertex irregular total 𝑘𝑘-labeling is called the total vertex irregularity strength of 𝐺𝐺, denoted by 𝑡𝑡𝑢𝑢𝑡𝑡(𝐺𝐺).

In 2010, Nurdin, Baskoro, Salman and Gaos conjectured that the total vertex irregularity strength of any tree 𝑇𝑇 is determined only by the number of vertices of degree 1, 2 and 3 in 𝑇𝑇. Precisely, they conjectured that 𝑡𝑡𝑢𝑢𝑡𝑡(𝑇𝑇) = 𝑚𝑚𝑁𝑁𝑥𝑥 {𝑡𝑡1, 𝑡𝑡2, 𝑡𝑡3}, where 𝑡𝑡𝑖𝑖 = ⌈ (1 + ∑ 𝑛𝑛𝑖𝑖𝑖𝑖

𝑗𝑗=1 /(𝑇𝑇 + 1) ⌉ and 𝑛𝑛𝑖𝑖 be the number of vertices of degree 𝑇𝑇 ∈ [1,3], is true. In this paper, we show that 𝑡𝑡𝑢𝑢𝑡𝑡(𝑆𝑆𝑚𝑚\𝑡𝑡𝑞𝑞𝐶𝐶𝑁𝑁𝑟𝑟𝑒𝑒 𝑆𝑆𝑛𝑛) = ⌈ (𝑚𝑚𝑛𝑛 − 𝑛𝑛 +1)/2 ⌉ for 𝑚𝑚, 𝑛𝑛 > 3 where ⌈ (𝑚𝑚𝑛𝑛 − 𝑛𝑛 + 1)/2 ⌉ can be considered as 𝑡𝑡1. This paper adds further support to conjecture about total vertex irregularity strength of trees.

Keywords: Irregularity Strength, Total Vertex Irregularity Strength, Star


239

Topic: Mathematics

[ABS-59] SUCCESSIVE METHOD APPROXIMATION FOR ROBUST

CONTROL OF BILINEAR SYSTEMS

Anita Kesuma Arum*, Roberd Saragih, Dewi Handayani

Mathematics Department, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Bilinear systems is the simplest class of nonlinear systems that represent many real physical processes. In the control bilinear system problems, it has the characteristic where the state of the system is multiplied by the control input. Disturbances is a factor that can interfere the work process of the system, so it is possible for the output of the system to be not in accordance with the desired output. Thus a robust controller must be found to make the system produce the desired output. This controller requires a solution to the state dependent algebraic Riccati equation (SDARE). However it is difficult to solve the SDARE. Successive method is one of the methods that can be used to solve this issue. The idea of this method is converting the bilinear systems into time-varying linear system. This method has the following steps : first, we need to obtain the robust control for the linear system by ignoring the multiplicative term of bilinear system. Second, convert the bilinear systems into the time-varying linear systems using the previous result, and then solve the SDARE by the new performance index and the associated Hamilton-Jacobi-Isaacs equation. Last, iterate the steps until the convergence of state satisfied. In this study, successive method were applied in virotherapy control problems. The virotherapy model has been widely developed, one of which is the cell cycle-specific model. This model is a bilinear systems. There are four compartment in this model: quiescent cells (Q), cancer cells (S), viruses (V), and infected cells (I). Viruses are injected into the human body as the control input to control the amount of the cancer cells. In this case viruses can only infect the cancer cells, and the infected cells will die when the lysis process occurs. Viruses, as a control, is given with the aim of minimizing the energy used in the system. In this model we consider the body’s immune response as an additive disturbances to the model. With the successive method, the problems in this model can be solved. Therefore we can always find the perfect strategy to control the cancer cells.

Keywords: robust, bilinear, successive, virotherapy


240

Topic: Mathematics

[ABS-319] Optimal Design of The Revised Double Sampling X Chart Based on

Median Run Length

Fachrur Rozi (*), Udjianna S. Pasaribu, Utriweni Mukhaiyar

Statistics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha 10, Bandung 40132, Indonesia

*f.rozi[at]mat.uin-malang.ac.id

Abstract

The double sampling (DS)-X chart is more effective than standard Shewhart chart in detecting small to moderate process mean shifts. The average run length (ARL) is traditionally and widely used optimization criterion in the design of the DS-X chart. Nevertheless, the shape and the skewness of the run length distribution change with the process mean shift, thus ARL is confusing and not necessarily a good representation of a control chart performance. Since the run length distribution is highly right-skewed, especially when the shift is small, it is argued that the median run length (MRL) provides an intuitive and a fair representation of central tendency of the run length distribution. Irianto (2008) proposed the revised DS-X chart by reducing the parameters of control limits into two control limits. The result is the revised DS-X chart outperform than the original DS-X chart proposed by Daudin (1992). In this paper, an optimal design of the revised DS-X chart based on MRL is investigated. The optimal parameters are provided for selected in-control MRL and in-control average sample size (ASS). The optimal parameters facilitate to construct the optimal revised DS-X chart are illustrated with a real application.

Keywords: Median run length, Process mean shift, Revised double sampling (DS)-X chart, Run length distribution


241

Topic: Mathematics

[ABS-320] The Modeling of Spatial-Time Series Count Data with High Zeros

Frequency using Zero Inflated Poisson (ZIP) Autoregression

U. Mukhaiyar (a*), R. P. Surahmat (a) and A. W. Mahdiyasa (a)

a) Statistic Research Division, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

There are many time series data have zeros observations. For example in observing monthly number of claims from a policyholder, it has high possibility to find that there is no claims in several months. When it is happened, the poisson or even normal distribution assumption will be not suitable. The alternative distribution that can be used is Zero Inflated Poisson (ZIP). The correlation between frequency of event at current time can certainly be influenced by previous times. Furthermore, the observation in a certain location may also be influenced by its neighbor locations. The affecting location has directly adjacent to modeled location. In this research, uniform and squared inverse distance weight used to accomodate those adjacent locations. Ait is obtained that model with squared inverse distance weight has higher probability to give a better result of modeling.

Keywords: Overdispersed, ZIP, Neighborhood, Weight spatial, Count data


242

Topic: Mathematics

[ABS-66] Optimal Control of Water Hyacinth and Grass Carp Fish for

Harvesting Strategy using Firefly Algorithm

Fitroh Resmi (a*), Indana Lazulfa (b)

a)Mathematics, Faculty of Mathematics and Natural Sciences, Billfath University, Lamongan, Indonesia

*[email protected] b) Informatics Engineering, Faculty of Information Technology, Hasyim Asyari University,

Jombang, Indonesia

Abstract

Water hyacinth plants (Eichhornia crassipes) are the most appear plants among the water garden plants. These plants are beautiful but destructive. Huge amount of these plants not only provide many benefits but also disrupt the life of underwater creatures such as fish. Grass carp fish is a herbivorous fish which can be used to reduce the growth rate of hyacinthplants. Interaction between water hyacinth and grass carp fish is modeled in prey-predator model Holling type III with harvesting of both. The optimal control problem is determining the harvesting rates of water hyacinth and grass carp so it can maximize the profits from harvesting and maintain the existence of grass carp and water hyacinth populations. The solution is obtained by applying the Pontryagin Maximum Principle. For more optimal solution, firefly algorithm is used to determine the weights in the objective function. Simulations are performed to capture an optimal solution.

Keywords: Holling Type III; Pontryagin Maximum Principle; Firefly Algorithm


243

Topic: Mathematics

[ABS-69] A multi objective firefly algorithm for practical portfolio optimization

problem

Indana Lazulfa

Informatics Engineering, Faculty of information technology, Hasyim Asyari University, Jombang, Indonesia

Abstract

Portfolio optimization is the process of allocating capital among a universe of assets to achieve better risk-return trade-off. Portfolio optimization is a solution for investors to get the return as large as possible and make the risk as small as possible. Due to the dynamic nature of financial markets, the portfolio needs to be rebalanced to retain the desired risk-return characteristics. The process of rebalancing requires buying or selling of assets that incur transaction costs. This study proposed multi objective portfolio optimization model with risk, return and transaction cost as the objective function. Various practical constraints like buy-in threshold and cardinality are included in the proposed model. We are concerned with risk measure for portfolio optimization, namely mean-variance model. For multi objective portfolio optimization problems will be used mean-variance model as risk measures. All these portfolio optimization problems will be solved by Firefly Algorithm (FA). In this research, our purpose is to present an efficient solution approach based on FA for solving buy-in threshold and cardinality constrained portfolio optimization problem. The increased number of fireflies helps to converge into optimal solution whereas by varying dimension. Computational result with FA confirm the effectiveness of the solution.

Keywords: Portfolio optimization, mean-variance, multi objective, buy-in threshold, cardinality constraint, firefly algorithm


244

Topic: Mathematics

[ABS-71] THE NON-ISOLATED RESOLVING NUMBER OF CORONA

GRAPHS

WAHYUNI ABIDIN (a*), A.N.M. SALMAN (a), AND SUHADI WIDO SAPUTRO (a)

a) Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesha No.10 Bandung 40132, Indonesia

* [email protected]

Abstract

For an ordered set 𝑊𝑊 = {𝑤𝑤1,𝑤𝑤2, … ,𝑤𝑤𝑘𝑘} of vertices and a vertex 𝑢𝑢 in a connected graph 𝐺𝐺, the representation of 𝑢𝑢 with respect to 𝑊𝑊 is the ordered 𝑘𝑘-tuple 𝑟𝑟(𝑢𝑢|𝑊𝑊) =(𝑑𝑑(𝑢𝑢,𝑤𝑤1),𝑑𝑑(𝑢𝑢,𝑤𝑤2), … , 𝑑𝑑(𝑢𝑢,𝑤𝑤𝑘𝑘)), where 𝑑𝑑(𝑥𝑥,𝑦𝑦) represents the distance between the vertices 𝑥𝑥 and 𝑦𝑦 in 𝐺𝐺. The set 𝑊𝑊 is called a resolving set for 𝐺𝐺 if every vertex of 𝐺𝐺 has distinct representations. A resolving set with the minimum number of vertices is called a basis for 𝐺𝐺 and its cardinality is called the metric dimension of 𝐺𝐺, denoted by 𝑑𝑑𝑇𝑇𝑚𝑚(𝐺𝐺). A resolving set 𝑊𝑊 is called a non-isolated resolving set if the induced subgraph ⟨ 𝑊𝑊 ⟩ has no isolated vertices. The minimum cardinality of a non-isolated resolving set of 𝐺𝐺 is called the non-isolated resolving number of 𝐺𝐺, denoted by 𝑛𝑛𝑟𝑟(𝐺𝐺). The corona product between a graph 𝐺𝐺 and a graph 𝐻𝐻, denoted by 𝐺𝐺 ⊙𝐻𝐻, is a graph obtained from one copy of 𝐺𝐺 and |𝑉𝑉(𝐺𝐺)| copies 𝐻𝐻1,𝐻𝐻2, … ,𝐻𝐻𝑛𝑛 of 𝐻𝐻 such that all vertices in 𝐻𝐻𝑖𝑖 are connected to the 𝑇𝑇-th vertex of 𝐺𝐺. In this paper, we study the non-isolated resolving sets of corona graphs. We determine 𝑛𝑛𝑟𝑟(𝐺𝐺 ⊙𝐻𝐻) where 𝐺𝐺 is any connected graph and 𝐻𝐻 is any graph.

Keywords: corona product graph, metric dimension, non- isolated resolving number, non-isolated resolving set


245

Topic: Mathematics

[ABS-78] Mixed Metric Dimension of Corona Product Graph

Hazrul Iswadi

Universitas Surabaya

Abstract

Let 𝐺𝐺 = (𝑉𝑉,𝐸𝐸) be a simple and connected graph with the set of vertices 𝐸𝐸 and the set of edges 𝐸𝐸. Let 𝑊𝑊 = {𝑤𝑤1,𝑤𝑤2,⋯ ,𝑤𝑤𝑘𝑘} be an ordered set of vertices in 𝐺𝐺. The mixed representation of 𝑢𝑢 ∈ 𝑉𝑉 ∪ 𝐸𝐸 with respect to 𝑊𝑊 is the ordered 𝑘𝑘-tuple 𝑟𝑟(𝑢𝑢|𝑊𝑊) = (𝑑𝑑(𝑢𝑢,𝑤𝑤1),𝑑𝑑(𝑢𝑢,𝑤𝑤2),⋯ , 𝑑𝑑(𝑢𝑢,𝑤𝑤𝑘𝑘)) where 𝑑𝑑(𝑢𝑢,𝑦𝑦) represents the distance between 𝑢𝑢 and 𝑦𝑦 ∈ 𝑊𝑊. If every 𝑢𝑢 ∈ 𝑉𝑉 ∪ 𝐸𝐸 has a distinct mixed representation then the set 𝑊𝑊 is called a mixed resolving set for 𝐺𝐺. A mixed basis of 𝐺𝐺 is a resolving set containing a minimum number of vertices. 𝑑𝑑𝑇𝑇𝑚𝑚(𝐺𝐺) is a notation for the mixed metric dimension of 𝐺𝐺 and is the number of vertices in a mixed basis of 𝐺𝐺. Let 𝐺𝐺 be a simple and connected graph and 𝐻𝐻 be a simple graph. A graph which formed by taking 𝑛𝑛 copies of 𝐻𝐻, let say 𝐻𝐻1,𝐻𝐻2,⋯ ,𝐻𝐻𝑛𝑛 and connecting 𝑇𝑇-th vertex of 𝐺𝐺 to every vertices of 𝐻𝐻𝑖𝑖 is called as a graph 𝐺𝐺 corona 𝐻𝐻} and denoted by 𝐺𝐺 ⊙𝐻𝐻. This research will characterize the mixed basis and metric dimension of corona product graph of graph 𝐺𝐺 with some certain graphs 𝐻𝐻.

Keywords: mixed resolving set, mixed basis, mixed metric dimension, corona product graph


246

Topic: Mathematics

[ABS-83] The comparative analysis of dependence for three-way contingency

table using Burt matrix and Tucker3 in correspondence analysis

Karunia Eka Lestari, Udjianna Sekteria Pasaribu, Sapto Wahyu Indratno


Abstract

Correspondence analysis (CA) is used to analyze dependency for categorical data in the contingency table. Analyzing the association structure of three-way contingency table is interesting to note in CA literature. The analysis can be handled by reducing the three-way contingency table into a two-way table using Burt matrix. This method is known as multiple correspondence analysis (MCA). However, MCA is not practical to use in big data. Another alternative is to preserve a three-way contingency table form using Tucker3, its known as a three-way correspondence analysis (CA3). In this study, the comparative analysis of dependence for three-way contingency table using Burt matrix and Tucker3 is shown. MCA differs fundamentally from CA3. In MCA, we analyzed the three-way contingency table of size i×j×k as matrix of size (i×j×k )×(i×j×k ). While in CA3 we preserve it as a cube matrix of size i×j×k. As a case study, Burt matrix and Tucker3 are applied to household data which containing information on occupation, race, and sex. The results show that CA3 is more simple in computation to use for big data. With respect to the three-way contingency table, the Tucker3 provide the graphical depiction of three-way association or interaction with a more precise of inertia.

Keywords: three-way contingency table, Burt matrix, Tucker3


247

Topic: Mathematics

[ABS-90] On Non-isolated Resolving Number of a Graph Cartesian Product with

a Star

Ismail Mulia Hasibuan, A.N.M. Salman, Suhadi Wido Saputro

Combinatorial Mathematics Reseach Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Indonesia

Abstract

Let 𝐺𝐺 be a simple, connected, and finite graph. For an ordered subset 𝑊𝑊 ={𝑤𝑤1,𝑤𝑤2, … ,𝑤𝑤𝑘𝑘} of vertices in a graph 𝐺𝐺 and a vertex 𝑢𝑢 of 𝐺𝐺, the metric representation of 𝑢𝑢 with respect to 𝑊𝑊 is the 𝑘𝑘-vector 𝑟𝑟(𝑢𝑢|𝑊𝑊) =(𝑑𝑑(𝑢𝑢,𝑤𝑤1),𝑑𝑑(𝑢𝑢,𝑤𝑤2),⋯ ,𝑑𝑑(𝑢𝑢,𝑤𝑤𝑘𝑘)) where 𝑑𝑑(𝑥𝑥,𝑦𝑦) represents the distance between the vertices 𝑥𝑥 and 𝑦𝑦. The set 𝑊𝑊 is called a resolving set for 𝐺𝐺 if every vertex of 𝐺𝐺 has a distinct representation. A resolving set containing a minimum number of vertices is called a basis for 𝐺𝐺. The metric dimension of 𝐺𝐺, denoted by 𝑑𝑑𝑇𝑇𝑚𝑚(𝐺𝐺), is the number of vertices in a basis of 𝐺𝐺. A resolving set 𝑊𝑊 is called a non-isolated resolving set of 𝐺𝐺, if the induced subgraph ⟨ 𝑊𝑊⟩ has no isolated vertices. The minimum cardinality of non-isolated resolving set of 𝐺𝐺 is called the non-isolated resolving number of 𝐺𝐺, denoted by 𝑛𝑛𝑟𝑟(𝐺𝐺). The Cartesian product of graphs 𝐺𝐺 and 𝐻𝐻, denoted by 𝐺𝐺\𝑡𝑡𝑞𝑞𝐶𝐶𝑁𝑁𝑟𝑟𝑒𝑒 𝐻𝐻, is the graph with the vertex set 𝑉𝑉(𝐺𝐺) × 𝑉𝑉(𝐻𝐻) ={(𝑁𝑁,𝑢𝑢)|𝑁𝑁 ∈ 𝑉𝑉(𝐺𝐺),𝑢𝑢 ∈ 𝑉𝑉(𝐻𝐻)}, where (𝑁𝑁,𝑢𝑢) is adjacent to (𝑃𝑃,𝑤𝑤) whenever 𝑁𝑁 = 𝑃𝑃 and {𝑢𝑢,𝑤𝑤} ∈ 𝐸𝐸(𝐻𝐻), or 𝑢𝑢 = 𝑤𝑤 and {𝑁𝑁, 𝑃𝑃} ∈ 𝐸𝐸(𝐺𝐺). Let 𝑆𝑆𝑛𝑛 be a star graph of order 𝑛𝑛. In this paper, we determine 𝑛𝑛𝑟𝑟(𝐻𝐻\𝑡𝑡𝑞𝑞𝐶𝐶𝑁𝑁𝑟𝑟𝑒𝑒 𝑆𝑆𝑛𝑛), where 𝐻𝐻 are cycles, complete graphs, complete bipartite graphs, and friendship graphs.

Keywords: Basis, Cartesian product graph, metric dimension, non-isolated resolving number, star graphs


248

Topic: Mathematics

[ABS-93] On The Rainbow Connection Number and Strong Rainbow Connection

Number of Generalized Triangle-Ladder Graph

Lyra Yulianti, Narwen, Shelli Fitrianda

Department of Mathematics, Andalas University, Kampus UNAND Limau Manis, Padang 25163, Indonesia

Abstract

Let G = (V,E) be a non-trivial connected graph. The rainbow coloring (respectively, strong rainbow coloring) c: E(G) → {1,2,...,k} is defined as the edge-coloring of G such as for every pair of vertices u, v ∈ V(G), there is some rainbow (respectively, rainbow geodesic) (u,v)-path, whose edges all have different colors. The rainbow connection number (respectively, strong rainbow coloring) of G, denoted by rc(G) (respectively, src(G)), is the smallest k such that G has the rainbow coloring (respectively, strong rainbow coloring). In this paper, we determine the rc(Trn) and src(Trn), where Trn is the generalized triangle-ladder graph, for n ≥ 1.

Keywords: Rainbow Connection Number, Strong Rainbow Connection Number, Generalized Triangle-Ladder Graph


249

Topic: Mathematics

[ABS-110] Some Graphs with Small Partition Dimension

Debi Oktia Haryeni, Edy Tri Baskoro

Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung, Jl. Ganesa 10 Bandung 40132 Indonesia

Abstract

Let 𝐺𝐺 = (𝑉𝑉,𝐸𝐸) be a connected graph. The distance between a vertex 𝐶𝐶 ∈ 𝑉𝑉(𝐺𝐺) and a subset of vertices and 𝑆𝑆 ⊂ 𝑉𝑉(𝐺𝐺) is 𝑑𝑑(𝐶𝐶, 𝑆𝑆) = min{𝑑𝑑(𝐶𝐶, 𝑥𝑥): 𝑥𝑥 ∈ 𝑆𝑆}. For an ordered partition Π = {𝑆𝑆1, 𝑆𝑆2, … , 𝑆𝑆𝑘𝑘} of 𝑉𝑉(𝐺𝐺), the representation of 𝐶𝐶 with respect to Π is 𝑟𝑟(𝐶𝐶|Π) = (𝑑𝑑(𝐶𝐶, 𝑆𝑆1),𝑑𝑑(𝐶𝐶, 𝑆𝑆2), … , 𝑑𝑑(𝐶𝐶, 𝑆𝑆𝑘𝑘)). Such a partition Π is called a resolving partition of 𝐺𝐺 if any two vertices 𝑥𝑥, 𝑦𝑦 ∈ 𝑉𝑉(𝐺𝐺) received distinct representation, namely 𝑟𝑟(𝑥𝑥|Π) ≠ 𝑟𝑟(𝑦𝑦|Π). The minimum integer 𝑘𝑘 such that 𝐺𝐺 has a resolving 𝑘𝑘-partition is defined as the partition dimension of 𝐺𝐺 and denoted by 𝑝𝑝𝑑𝑑(𝐺𝐺). In addition, if any adjacent vertices of 𝐺𝐺 are contained in different elements 𝑆𝑆𝑖𝑖 of the partition Π, then the minimum cardinality of such partition is defined as a locating-chromatic number of 𝐺𝐺 and denoted by 𝜒𝜒𝐿𝐿(𝐺𝐺).

All graphs of order 𝑛𝑛 ≥ 2 with partition dimension 2, 𝑛𝑛 − 2,𝑛𝑛 − 1 or 𝑛𝑛 has been characterized. However, the characterization of all graphs with small partition dimension other than 2 is an open problem. On the other hand, the characterization of all trees as well as graphs containing cycles with locating chromatic number 3 have been completely done. By these known results, we present some methods to obtain graphs having partition dimension 3 by extending all trees and graphs containing cycles with locating chromatic number 3. We also construct some classes of graph by connecting some vertices of a joining paths, so that the partition dimension of these graph is also equal to 3.

Keywords: Graph; Tree; Partition dimension; Locating-chromatic number; Path


250

Topic: Mathematics

[ABS-113] Performance Based Preventive Maintenance For A Remanufactured

Equipment Lease Contract

Bermawi P. Iskandar (1), Rachmawati Wangsaputra (1), Hennie Husniah (2)

(1) Department of Industrial Engineering, Bandung Institute of Technology, Ganesha 10,Bandung, 40132, Indonesia

(2) Department of Industrial Engineering, Langlangbuana University, Karapitan 116,Bandung, 40261, Indonesia

Abstract

Recently, many companies tend to acquire equipment through leasing rather than to purchase it. The main motivations of leasing are saving on initial investment, flexibility on equipment upgrading, and cost reduction in maintenance and inventory of spare parts. A lease contract offered not only for a new equipment but also for a used or remanufactured equipment. In general, a remanufactured product is considered by customers as a low reliability. In order to give a positive signal (a high acceptance) for a lease of a remanufactured equipment, the lessor ensures a minimum availability of the equipment during a lease contract period. This in turn reduces the risk and makes the consumer willing to lease a remanufactured equipment. In this paper, we study a performance based preventive maintenance for a remanufactured equipment leased for a certain period. Under the lease contract, the lessor promises a minimum availability, and this needs the preventive maintenance (pm) policy (called a performance based pm policy) that can result in a high availability. The preventive maintenance is carried out periodically using failure rate reduction model and each pm improves the reliability of the equipment. We study from the lessor’s view point and obtain the optimal pm such that to minimise the total maintenance cost with keep the reliability as high as possible. Numerical examples are given to illustrate the optimal pm policy.

Keywords: lease, availability, preventive maintenance


251

Topic: Mathematics

[ABS-114] On the Locating-chromatic Numbers of Subdivisions of Friendship

Graph

Brilly Maxel Salindeho (a*), Hilda Assiyatun (b), Edy Tri Baskoro (b)

a) Faculty of Mathematics and Natural Sciences, Mulawarman University, Jalan Barong Tongkok 4,

Samarinda 75242, Indonesia *[email protected]

b) Faculty of Mathematics and Natural Sciences, Mulawarman University, Bandung Institute of Technology,

Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Let 𝑐𝑐 be a 𝑘𝑘-coloring of a connected graph 𝐺𝐺 and let 𝜋𝜋 = {𝐶𝐶1,𝐶𝐶2, … ,𝐶𝐶𝑘𝑘} be the partition of 𝑉𝑉(𝐺𝐺) induced by 𝑐𝑐. For every vertex 𝑢𝑢 of 𝐺𝐺, let 𝑐𝑐𝜋𝜋(𝐺𝐺) be the coordinate of 𝑢𝑢 relative to 𝜋𝜋, that is 𝑐𝑐𝜋𝜋(𝐺𝐺) = (𝑑𝑑(𝑢𝑢,𝐶𝐶1),𝑑𝑑(𝑢𝑢,𝐶𝐶2), … ,𝑑𝑑(𝑢𝑢,𝐶𝐶𝑘𝑘)), where 𝑑𝑑(𝑢𝑢,𝐶𝐶𝑖𝑖) = 𝑚𝑚𝑇𝑇𝑛𝑛{𝑑𝑑(𝑢𝑢, 𝑥𝑥)|𝑥𝑥 ∈ 𝐶𝐶𝑖𝑖}. If every two vertices of 𝐺𝐺 have different coordinates relative to 𝜋𝜋, then 𝑐𝑐 is said to be a locating 𝑘𝑘-coloring of 𝐺𝐺. The locating-chromatic number of 𝐺𝐺, denoted by 𝜒𝜒𝐿𝐿(𝐺𝐺), is the least 𝑘𝑘 such that there exists a locating 𝑘𝑘-coloring of 𝐺𝐺. In this paper, we determine the locating-chromatic numbers of some subdivisions of the friendship graph 𝐹𝐹𝑟𝑟𝑡𝑡, that is the graph obtained by joining 𝑡𝑡 copies of 3-cycle with a common vertex, and we give lower bounds to the locating-chromatic numbers of few other subdivisions of 𝐹𝐹𝑟𝑟𝑡𝑡.

Keywords: Friendship graph, Locating-chromatic number, Locating coloring, Subdivision


252

Topic: Mathematics

[ABS-117] Generalized Least Square Method for Estimating Parameter of

Demand Function of Animal Protein In Indonesia

Fitria Virgantari*, Hagni Wijayanti*, Sonny Koeshendrajana**

*Departement of Mathematics, Pakuan University ([email protected], [email protected])

**Agency for Research and Manpower Resource of the Marine Affairs and Fisheries ([email protected])

Abstract

Ordinary least square (OLS) method is the most popular and commonly technique used to estimate numerical values of parameters of selected regression models. This was due to its unbiasedness property. However, when elements of dependent variable have unequal variances and/or correlated each other, there is no guarantee that the OLS estimator will show the most efficient within the class of linear unbiased estimators. Generalized least square (GLS) method was introduced to improve estimated parameter’s efficiencies in those condition. This paper reported a study of application of GLS method for estimating parameter of demand function of animal protein in Indonesia of which have a system equation. This system of equation causes violation of the assumptions of homoscedasticity and independency of estimated parameters. Secondary data obtained from the Central Bureau of Statistics 2016 in 34 provinces in Indonesia was used in this study. Animal food was grouped in terms of fish, meat, eggs and milk. Results showed that error of those three equations were correlated. It suggests that GLS method should be used. Normality and homogenity assumptions were not violated. The determination coefficient was 99%, indicating that the the model was very good.

Keywords: generalized least square method, parameter estimation, demand function, animal protein


253

Topic: Mathematics

[ABS-118] Uniserial Dimension of Finitely Generated Primary Modules Over

Discret Valuation Domain

Arifin S., Garminia H., Astuti P.

Institut Teknologi Bandung, Jalan Ganesha No.10, Bandung, Jawa Barat, Indonesia 40132

Abstract

Recently, Nazemian and Ghorbani (2014) introduced the notion of the uniserial dimension of a module over a commutative ring that measures of how far the module deviates from being uniserial. In this article we give some methods to determine the uniserial dimension of a finitely generated primary module over a discrete valuation domain. It is well known that a finitely generated primary modules over a discrete valuation domain can be decomposed as a direct sum of finite cyclic submodules where the orders of the cyclic generators are called the elementary divisors of the module. We show that the uniserial dimension of the module is a function of the elementer divisors of the module.

Keywords: Uniserial dimension, valuation dimension, finitely generated, discrete valuation domain


254

Topic: Mathematics

[ABS-121] The strong rainbow 2-connectivity of some subdivided wheels

Bety Hayat Susanti, A.N.M. Salman, and Rinovia Simanjuntak

Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesa 10, Bandung, 40132, Indonesia

Abstract

An edge-coloring graph 𝐺𝐺 is rainbow 𝑘𝑘-connected, if for every two distinct vertices of 𝐺𝐺, there are 𝑘𝑘 internally disjoint rainbow paths, i.e., all edges of each path have different colors. The minimum number of colors needed for which there exists a rainbow 𝑘𝑘-connected coloring of 𝐺𝐺, denoted by 𝑟𝑟𝑐𝑐𝑘𝑘(𝐺𝐺), is called the rainbow 𝑘𝑘-connection number of 𝐺𝐺. Let 𝑐𝑐 be a rainbow coloring of a connected graph 𝐺𝐺. For any two vertices 𝐶𝐶 and 𝑢𝑢 of 𝐺𝐺, a rainbow 𝐶𝐶 − 𝑢𝑢 geodesic in 𝐺𝐺 is a rainbow 𝐶𝐶 − 𝑢𝑢 path of length 𝑑𝑑(𝐶𝐶,𝑢𝑢), where 𝑑𝑑(𝐶𝐶, 𝑢𝑢) is the distance between 𝐶𝐶 and 𝑢𝑢. A graph 𝐺𝐺 is strong rainbow 𝑘𝑘-connected if there exist 𝑘𝑘 internally disjoint rainbow 𝐶𝐶 − 𝑢𝑢 geodesics for any two vertices 𝐶𝐶 and 𝑢𝑢 in 𝐺𝐺. In this case, the coloring 𝑐𝑐 is called a strong rainbow 𝑘𝑘-coloring of 𝐺𝐺. Similarly, we define the strong rainbow 𝑘𝑘-connection number of 𝐺𝐺, denoted by 𝑡𝑡𝑟𝑟𝑐𝑐𝑘𝑘(𝐺𝐺), as the minimum number of colors needed for which there exists a strong rainbow 𝑘𝑘-coloring of 𝐺𝐺.

Let 𝑡𝑡 be a positive integer. A 𝑡𝑡-subdividing of 𝑒𝑒 = 𝐶𝐶𝑢𝑢 ∈ 𝐸𝐸(𝐺𝐺) means that 𝑒𝑒 is replaced by a path between 𝐶𝐶 and 𝑢𝑢 which has 𝑡𝑡 + 1 edges, namely 𝐶𝐶𝑤𝑤1,𝑤𝑤1𝑤𝑤2, … ,𝑤𝑤𝑡𝑡−1𝑤𝑤𝑡𝑡,𝑤𝑤𝑡𝑡𝑢𝑢. A graph obtained from 𝐺𝐺 by 𝑡𝑡-subdividing of edge 𝑒𝑒𝑖𝑖 for all 𝑇𝑇 ∈ {1, … , 𝑘𝑘}, is denoted by 𝑆𝑆𝐶𝐶𝑃𝑃(𝐺𝐺; 𝑒𝑒1, 𝑒𝑒2, … , 𝑒𝑒𝑘𝑘; 𝑡𝑡). In this paper, we determine the strong rainbow 2-connection number of some subdivided wheels.

Keywords: rainbow geodesic, strong rainbow 𝒌𝒌-connectivity, subdivision, wheels


255

Topic: Mathematics

[ABS-122] Optimal Decisions for Two Dimensional Maintenance Service Contract

Involving Three Parties (manufacturer, agent and consumer) in Cooperative and Competitive Situations

Nur F. Saidah (a), Andi Cakravastia (b), U.S. Pasaribu (c), Bermawi P. Iskandar (b*)

(a) Doctoral Program in Industrial Engineering and Management, (b) Department of Industrial Engineering, (c) Department of Mathematics, Bandung Institute of Technology, Bandung,

Indonesia *[email protected]

Abstract

A two-dimensional maintenance service contract (MSC) for equipment (e.g. a dump truck), which involves three parties (i.e. manufacturer, agent and consumer) is considered in this paper. The contract is characterized by two limits - i.e. time and usage limits. The manufacturer or agent offers a MSC for L (e.g. 1 year) with the maximum usage U_l (e.g. 60.000km travelled). The contract period is limited to L, but equipment usage may exceed U_l. However, the owner (customer) of the equipment will incur additional costs paid to the manufacturer/agent if the usage of equipment exceeds U_l at the end of period L. Failure of equipment is modeled with the accelerated failure time (AFT) model allowing to incorporate age and usage into the model. High usage of equipment will increase revenue for the consumer, but it causes some additional costs due to the usage exceeding U_l. This in turn requires the Agent to do a more effective maintenance (and hence it increases the maintenance cost) to lower the number failures and downtimes. We consider two relationship pattern between a manufacturer and an agent –i.e. (i) cooperation (both collaborate to provide MSC) and (ii) competition (both offer a similar MSC). The decision problem for the consumer is to select the best option of MSC, and seek the optimum value of use (U^*) that maximizes its profit. Whilst the decision problem for the manufacturer (or Agent) is to determine the price of each contract offered which gives a maximum profit. As there are two types of interaction considered between the manufacturer and the agent in carrying out maintenance action under a MSC, then it needs a one-level optimization (if the interaction is cooperation), and a bi-level optimization (if the interaction is competition) to find the optimal decision for each party involved (the manufacturer, the agent, and the customer). Numerical examples are presented to illustrate optimal decisions for the three parties.

Keywords: Maintenance service contract; Decision problem; Three-parties; Bi-level optimization


256

Topic: Mathematics

[ABS-123] Comparison of Adams-Bashforth-Moulton Order 4, 5 and 6 Methods in

Analyzing Errors and Simulation Results of Vertical and Torsional Oscillation on String Model

Ari Kusumastuti(*), Mohammad Jamhuri, Hendrik Widya Permata

Department of Mathematics, State Islamic University of Maulana Malik Ibrahim,Jalan Gajayana No.50, Malang 65144, Indonesia

*[email protected]

Abstract

Vertical and torsional oscillations on string model is the model that illustrate vertical oscillations and torsional motions on the string. The vertical oscillation motion is a continuously up and down movement, and then at a certain time it will be stopped or re-attenuated. Torsional motion is the angular vibration from the things that are going to rotate. The vertical and torsional oscillation on string model is essential system of second-order differential equations. The purpose of this research is to know the solution of numerical model of vertical oscillation and torsional on string using Adams-Bashforth-Moulton method of order four, five, and six. The model of vertical and torsional oscillation on string was first done using the five-order Runge-Kutta-Fehlberg method to obtain an initial solution and then that model were finished using Adams-Bashforth-Moulton model of the order of four, five, and six. The results of numerical solutions of each Adam-Bashforth method was examined by relative error. The numerical simulation results of the vertical and torsional oscillation on string model obtained that vertical oscillation and torsional motion are muted harmonic motion and the higher the order in the Adams-Bashforth-Moulton method, the faster the relative error will be to zero and otherwise.

Keywords: Adams-Bashforth-Moulton method,Vertical and torsional oscillations on string model, error analysis


257

Topic: Mathematics

[ABS-125] (C(k), C(k+1)) −Supermagic Labellings of Cupola Graph Cu(k, k+1, n)

Gardhani Muhammad Issaac(1*) M. Salman. A. N. (2)

1) Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung (ITB), Jl. Ganesa 10 Bandung 40132, Indonesia

∗[email protected] 2) Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences,

Institut Teknologi Bandung (ITB), Jl. Ganesa 10 Bandung 40132, Indonesia

Abstract

A simple and finite graph 𝐺𝐺 = (𝑉𝑉,𝐸𝐸) which has two subgraphs 𝐻𝐻1 and 𝐻𝐻2 admits an (𝐻𝐻1,𝐻𝐻2) − 𝑐𝑐𝑚𝑚𝑢𝑢𝑒𝑒𝑟𝑟𝑇𝑇𝑛𝑛𝑀𝑀 if each edge in 𝐸𝐸 belongs to a subgraph isomorphic to 𝐻𝐻1 or 𝐻𝐻2. Let 𝐺𝐺 = (𝑉𝑉,𝐸𝐸) admits (𝐻𝐻1,𝐻𝐻2) − 𝑐𝑐𝑚𝑚𝑢𝑢𝑒𝑒𝑟𝑟𝑇𝑇𝑛𝑛𝑀𝑀. Graph 𝐺𝐺 is called (𝐻𝐻1,𝐻𝐻2)-magic if there exist two positive integers 𝑘𝑘1 and 𝑘𝑘2 and a bijective function 𝑓𝑓:𝑉𝑉 ∪𝐸𝐸 → {1,2,3, . . . , |𝑉𝑉| + |𝐸𝐸|} such that for all 𝑇𝑇 ∈ [1,2], ∑ 𝑓𝑓(𝑢𝑢)𝑢𝑢∈𝑉𝑉𝑖𝑖 + ∑ 𝑓𝑓(𝑒𝑒)𝑒𝑒∈𝐸𝐸𝑖𝑖 =𝑘𝑘𝑖𝑖 for every subgraph 𝐻𝐻𝑖𝑖 = (𝑉𝑉𝑖𝑖,𝐸𝐸𝑖𝑖) of 𝐺𝐺 isomorphic to 𝐻𝐻𝑖𝑖. Furthermore, the graph 𝐺𝐺 is called (𝐻𝐻1,𝐻𝐻2) − 𝑡𝑡𝐶𝐶𝑝𝑝𝑒𝑒𝑟𝑟𝑚𝑚𝑁𝑁𝑀𝑀𝑇𝑇𝑐𝑐 if 𝑓𝑓(𝑉𝑉) = {1,2, . . . , |𝑉𝑉|}.

In this research we introduce a cupola graph. Let 𝑛𝑛 ∈ ℕ. Let 𝑁𝑁 and 𝑃𝑃 are integers with 3 ≤ 𝑁𝑁 < 𝑃𝑃. For 𝑇𝑇 ∈ [1, 𝑛𝑛], let 𝐶𝐶𝑏𝑏,𝑖𝑖 be a cycle graph of 𝑃𝑃 which 𝑉𝑉�𝐶𝐶𝑏𝑏,𝑖𝑖� =�𝑢𝑢𝑖𝑖,𝑗𝑗�𝑗𝑗 ∈ [1, 𝑃𝑃 − 1]� ∪ {𝑢𝑢𝑖𝑖+1,1} with 𝑢𝑢𝑛𝑛+1,1 = 𝑢𝑢1,1 and 𝐸𝐸�𝐶𝐶𝑏𝑏,𝑖𝑖� =�𝑢𝑢𝑖𝑖,𝑗𝑗𝑢𝑢𝑖𝑖,𝑗𝑗+1�𝑗𝑗 ∈ [1, 𝑃𝑃 − 2]� ∪ {𝑢𝑢𝑖𝑖,𝑏𝑏−1𝑢𝑢𝑖𝑖+1,1,𝑢𝑢𝑖𝑖+1,1𝑢𝑢𝑖𝑖,1}. Let 𝑟𝑟 = ⌊𝑎𝑎−1

2⌋. Define cupola

graph 𝐶𝐶𝐶𝐶(𝑁𝑁, 𝑃𝑃,𝑛𝑛) = (𝑉𝑉,𝐸𝐸) as follows. For odd 𝑁𝑁, 𝑉𝑉(𝐶𝐶𝐶𝐶(𝑁𝑁, 𝑃𝑃, 𝑛𝑛)) = ⋃ 𝑉𝑉(𝐶𝐶𝑏𝑏,𝑖𝑖)𝑛𝑛𝑖𝑖=1

and 𝐸𝐸�𝐶𝐶𝐶𝐶(𝑁𝑁, 𝑃𝑃,𝑛𝑛)� = �⋃ 𝐸𝐸�𝐶𝐶𝑏𝑏,𝑖𝑖�𝑛𝑛𝑖𝑖=1 � ∪ (⋃ {𝑢𝑢𝑖𝑖,𝑏𝑏−𝑟𝑟𝑢𝑢𝑖𝑖+1,𝑟𝑟+1}𝑛𝑛

𝑖𝑖=1 ). For even 𝑁𝑁, 𝑉𝑉�𝐶𝐶𝐶𝐶(𝑁𝑁, 𝑃𝑃,𝑛𝑛)� = �⋃ 𝑉𝑉�𝐶𝐶𝑏𝑏,𝑖𝑖�𝑛𝑛

𝑖𝑖=1 � ∪ (⋃ {𝑤𝑤𝑖𝑖}𝑛𝑛𝑖𝑖=1 ) and 𝐸𝐸�𝐶𝐶𝐶𝐶(𝑁𝑁, 𝑃𝑃, 𝑛𝑛)� =

�⋃ 𝐸𝐸�𝐶𝐶𝑏𝑏,𝑖𝑖�𝑛𝑛𝑖𝑖=1 � ∪ (⋃ {𝑢𝑢𝑖𝑖−1,𝑏𝑏−𝑟𝑟𝑤𝑤𝑖𝑖 ,𝑤𝑤𝑖𝑖𝑢𝑢𝑖𝑖,𝑟𝑟+1}𝑛𝑛

𝑖𝑖=1 ).

By using (𝑘𝑘1,𝑘𝑘2, 𝑙𝑙1, 𝑙𝑙2)-balanced multiset partition, we investigate existance of (𝐶𝐶𝑘𝑘 ,𝐶𝐶𝑘𝑘+1) − 𝑡𝑡𝐶𝐶𝑝𝑝𝑒𝑒𝑟𝑟𝑚𝑚𝑁𝑁𝑀𝑀𝑇𝑇𝑐𝑐 labeling on an 𝑛𝑛-gonal cupola 𝐶𝐶𝐶𝐶(𝑘𝑘,𝑘𝑘 + 1, 𝑛𝑛). We prove that 𝐶𝐶𝐶𝐶(𝑘𝑘,𝑘𝑘 + 1,𝑛𝑛) is (𝐶𝐶𝑘𝑘,𝐶𝐶𝑘𝑘+1) − 𝑡𝑡𝐶𝐶𝑝𝑝𝑒𝑒𝑟𝑟𝑚𝑚𝑁𝑁𝑀𝑀𝑇𝑇𝑐𝑐 for every 𝑛𝑛 ≥ 3 and 𝑘𝑘 ≥3.

Keywords: cupola graph Cu(a,b,n), (H1,H2)-covering, (H1,H2)-supermagic labeling, (k1,k2,l1,l2)-balanced multiset


258

Topic: Mathematics

[ABS-128] Analysis of a three-phase vs a four-phase trafic lights regulation for a

four-leg intersection

S.R. Pudjaprasetya, M.M. Noor

Industrial & Financial Mathematics Research Group

Abstract

Traffic management at intersections is an important factor that can determine traffic density at the intersection, and its surrounding. Long traffic queue that we often encounter preceding a cross section is sometimes caused by ineffectiveness of traffic lights management. In this article, a four leg intersection with traffic lights is considered, and the performance of three-phase versus four-phase traffic regulations are compared and analyzed. In this approach, the length of traffic queues on each leg of the intersection is determined by the shock path of the adopted kinematic LWR model with the Underwood flux function. This way, the length of traffic queue can be compared to determine which traffic arrangements is more effective. A case study at Taman Sari - Baltos intersection (Bandung, Indonesia) is given.

Keywords: kinematic LWR model, shock wave, rarefaction wave


259

Topic: Mathematics

[ABS-140] Geometric Asian Rainbow Put Options under Fractional Brownian

Motion

Aulia Rizky Nurhidayah (a*), Isnani Darti (b), Mila Kurniawaty (b)

Department of Mathematics, Faculty of Mathematics and Natural Sciences, Brawijaya University, Jalan Veteran, Malang 65145, Indonesia

*[email protected]

Abstract

Exotic options are the options where the payoff is calculated differently from vanilla options. There are two exotic options that are very popular in financial research, Asian options and rainbow options. Asian options is the options that the payoff is dependdent of the average price of the underlying asset, over some prespecified period and prespecified frequency, during the lifetime of the option. Rainbow options is the options whose payoff depends on more than one underlying asset and the aim of rainbow options is to select the best and worst to buy or sell the multiple assets. The previous study Lu Wang, et.all (2018) tackled the issue of Asian Call rainbow option pricing formula under fractional Brownian motion. Then, in this paper we study Asian rainbow put option pricing under fractional Brownian motion under the condition that the assets have self-similar and long-range dependence characteristics. Based on the principle of no arbitrage, stochastic differential equation, and partial differential equation, we obtain Asian rainbow put option pricing formula for two underlying assets under fractional Brownian motion. Finally numerical studies are performed to illustrate the performance of our proposed option pricing model.

Keywords: Exotic Options; Asian Options; Rainbow Options; Fractional Brownian Motion


260

Topic: Mathematics

[ABS-141] Generalization of Non One Sided Bounded Variation Sequences and

Applications

Ratna Muffidah*, Moch. Aruman Imron, Ratno Bagus E.W.

Departement of Mathematics, Faculty of Mathematics and Natural Secience, University of Brawijaya,

Jalan Veteran No. 16 Malang 65145, Indonesia *[email protected]

Abstract

Tikhonov introduce general monotone sequences on 2006. On 2007, Tikhonov have been discuss this result to be β-general monotone sequences. Moreover, Bogdan Szal added r a natural number, hence to be (β,r)-general monotone sequence. Generalization on monotonicity condition resulting a new class called non one sided bounded variation sequences and β-non one sided bounded variation sequences. In this paper we define a new class and sequence of ( β,r)-non one sided bounded variation sequences, which generalize and extend from previous class. Moreover, we obtained sufficient and necessary conditions for uniform convergence on note.

Keywords: β-General Monoton Sequences, (β,r)-General Monotone Sequence, β-Non One Sided Bounded Variation Sequences, (β,r)-Non One Sided Bounded Variation Sequences


261

Topic: Mathematics

[ABS-165] Stability and Bifurcation of Bird Flu Transmission Model

Arrival Rince Putri(a*), M Watanabe(b)

a) Department of Mathematics, Faculty of Mathematics and Natural Science, Andalas University, Indonesia

* [email protected] b) Graduate School of Environmental and Life Science, Okayama University, Japan

Abstract

We describe a mathematical model to interpret transmission of bird flu in a poultry farm. It is assumed that the population in the poultry farm divided into two classes: susceptible birds (S) and infected birds (I). Mathematical analysis shows that dynamic of the transmission is determined by threshold number Ro. Result concerning critical points that correspond to an infection free state and endemic state are described. The local and global stability of the model is studied. The occurrence of local bifurcation near the critical points is studied. Finally, analytical results are confirmed by numerical results.

Keywords: Bird flu transmission, Dynamic system; Stability; Bifurcation; Numericall


262

Topic: Mathematics

[ABS-180] The strong 3-rainbow index of some subdivided graphs

Zata Yumni Awanis*, A.N.M. Salman, Suhadi Wido Saputro

Combinatorial Mathematics Research Group, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract

Let 𝐺𝐺 be a nontrivial, connected and edge-colored graph of order 𝑛𝑛, where adjacent edges may be colored the same. A tree 𝑇𝑇 in 𝐺𝐺 is called a rainbow tree, if every two distinct edges in 𝑇𝑇 has different colors. For 𝑘𝑘 ∈ {2,3, . . . , 𝑛𝑛}, let 𝑆𝑆 be the set of 𝑘𝑘 vertices of 𝐺𝐺. The Steiner 𝑆𝑆-tree is a tree in 𝐺𝐺 containing 𝑆𝑆 with the minimum size. A strong 𝑘𝑘-rainbow coloring of 𝐺𝐺 is an edge-coloring of 𝐺𝐺 having property that for every set 𝑆𝑆 of 𝑘𝑘 vertices of 𝐺𝐺, there exists a rainbow Steiner 𝑆𝑆-tree 𝑇𝑇 such that 𝑆𝑆 ⊆𝑉𝑉(𝑇𝑇). The minimum number of colors needed in a strong 𝑘𝑘-rainbow coloring of 𝐺𝐺 is the strong 𝑘𝑘-rainbow index of 𝐺𝐺, denoted by 𝑡𝑡𝑟𝑟𝑥𝑥𝑘𝑘(𝐺𝐺). In this paper, we focus on 𝑘𝑘 = 3. We determine the strong 3-rainbow index of some subdivided fans and cycle with one chord.

Keywords: rainbow coloring, rainbow steiner tree, strong 3-rainbow index, subdivided graphs


263

Topic: Mathematics

[ABS-190] Isomorphism between Endomorphism Rings of Modules Over a

Semisimple Ring

Hery Susanto (a*), Santi Irawati (a), Indriati Nurul Hidayah (a), Irawati (b)

a) Mathematics Department, Universitas Negeri Malang, Jalan Semarang 5, Malang 65145, Indonesia

* [email protected] b) Mathematics Department, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132,

Indonesia

Abstract

Our question is what ring 𝑅𝑅 which all modules over 𝑅𝑅 are determined, up isomorphism, by their endomorphism rings? Examples of this ring are division ring and simple Artinian ring. Any semisimple ring does not satisfy this property. We construct a semisimple ring but is not a simple Artinian ring which all modules over the ring are determined, up isomorphism, by their endomorphism rings.

Keywords: Modules, division ring, simple Artinian ring, semisimple ring


264

Topic: Mathematics

[ABS-196] Predictive Analysis of Employee Loyalty: A Comparative Study Using

Logistic Regression Model and Artificial Neural Network

Maria Zefanya Sampe (a*), Eko Ariawan (b)

a) Faculty Member of Business Mathematics, School of Applied STEM, Universitas Prasetiya Mulya, Jalan BSD Raya Utama, BSD City, Tangerang 15339, Indonesia

*[email protected] b) Faculty Member of Enterprise Software Engineering, School of Applied STEM, Universitas

Prasetiya Mulya, Jalan BSD Raya Utama, BSD City, Tangerang 15339, Indonesia

Abstract

Employees as assets of the company are expected to work professionally and contribute extensively to the productivity success of the entire company. A high turnover phenomenon becomes a big problem that will certainly affect the performance of the company. As an additional input, the application of logistic models and artificial neural networks to predict the loyalty of new employee candidates involve into an important things for human resource deployment (HRD) to accept new employee candidates in the company. Variable dependents such as division, satisfaction level, last evaluation index, number of project, average monthly hours, time spend company, work accident, promotion, and position will be used to compare sensitivity, specificity, and goodness of fit for both of two models.

Keywords: predictive analysis; logistic regression model; artificial neural network; employee loyalty


265

Topic: Mathematics

[ABS-202] Mean Variance Skewness Kurtosis Superskewness (MVSKS) Portfolio

Optimization with One Constraint

Dina Fakhriyana (a*), Abdurakhman (a)

a) Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Gadjah Mada, Yogyakarta, Indonesia

*[email protected]

Abstract

Almost every investment contains an uncertainty or risk, investors could gain profit or loss. Way to minimize investment risk is diversification, which is by forming a portfolio consists of several assets. Mean Variance (MV) is a portfolio model that first introduced to the public and used most often. This model aims to have a minimum variance among the entire portfolio that can be formed and utilize two statistical moments i.e the mean in maximize the expected return and the variance (the square of the standard deviation) in minimize the risk. On the other hand, many patterns of abnormality are found in the statistical properties of financial data. So, it is important to involve higher statistical moments such as skewness, kurtosis, and superskewness stock returns in portfolio analysis. Portfolio that includes higher moments is called Mean Variance Skewness Kurtosis Superskewness (MVSKS). Then, the case study was conducted by comparing the two models with one constraint of the four Indonesian stocks. In this research, weights of optimal portfolio are calculated using R software with the rootSolve package. The results of this research is MVSKS succeed to provide smaller loss than MV model in one constraint case.

Keywords: Portfolio; MVSKS; Skewness; Kurtosis; Superskewness


266

Topic: Mathematics

[ABS-209] A Model of Customer Lifetime Value using Marcov Chain with

Dynamical Interest Rates

Dony Permana(a*), Sapto Wahyu Indratno(b), Udjianna S. Pasaribu(b)

a) Study Programme in Statistic, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang

* [email protected] b) Statistics Research Division, Faculty of Mathematics and Natural Sciences,


Abstract

The Customer Lifetime Value (CLV) models with Markov Chain often use a assumption of fixed interest rates. The fixed interest rates policy does not match with reality. In the real world, interest rates often change every month, although the changes are relatively small. The amount of the interest rates is set every month by the government. Many factors lead to a change in interest rates. Interest rates are one of the parameters that determine the magnitude of CLV on the Markov chain stochastic model. In this paper, interest rates are subject to change on existing CLV models. The changes are randomly applied at an interval. As a result, the CLV calculations on the model with dynamical interest rates did not differ greatly from the CLV calculation results in the same model as the fixed interest.

Keywords: Customer Lifetime Value, Markov Chain, Fixed Interest Rates, Dynamical Interest Rates


267

Topic: Mathematics

[ABS-217] Probability Of Failure Model In Mechanical Component Because Of

Fatigue

Adilan Widyawan Mahdiyasa (a*) and Anung Grahito (b)

a) Statistics Research Division, Faculty of Mathematics and Natural Science, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Aeronautics and Astronautics Research Division, Faculty of Mechanical and Aerospace

Engineering, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

Abstract

Fatigue is one of the most common modes in the failure of a mechanical component. Fatigue experiment shows that the coefficient of variation of fatigue life data is ranging from 30% to 40%. High deviation of the data means the deterministic prediction of fatigue life may not be valid anymore, hence probability-based method to calculate the probability of failure due to fatigue damaged is conducted. The probability of failure prediction methodology is based on damage fraction concept. As the usage cycles increase, the damage fraction increases until it reaches critical damage point where a component fails. Damage fraction is a function of ultimate strength and fatigue limit, in which both are modelled as random variables with normal distribution. The validation is done by variating standard deviation of each random variables. The validation result shows that increasing standard deviation of both ultimate strength and fatigue limit will increase the probability of failure.

Keywords: Failure probability, Fatigue, Normal distribution, Damage accumulation


268

Topic: Mathematics

[ABS-228] Feedback Inhibition Effects on the Dynamics of the Metabolites on the

Central Metabolism of the Yeast Cells

Kasbawati(a*), Agnes(a), Naimah Aris(a), Hasnah Natsir(b)

(a) Department of Mathematics, Hasanuddin University, Jl. P. Kemerdekaan Km. 10, Makassar, Indonesia

*[email protected] (b) Department of Chemistry, Hasanuddin University,

Jl. P. Kemerdekaan Km. 10, Makassar, Indonesia

Abstract

Fermentation system is a metabolic system that can be considered as a complex system. It involves metabolites linked by different reactions. Some outputs from the reaction act as an input in other reactions and they control the behavior of the fermentation system. Glucose as the main carbon source of the yeast cell plays an important role in the fermentation metabolic pathway. This greatly affects the cell reproduction cycle and product synthesis. Several experiments have shown that glucose provides negative feedback to the reactions in the central metabolism of the yeast cell. Although glucose acts as a negative feedback, it can also be used to promote certain processes on the metabolic pathway. Based on these facts in this study we analyze effects of glucose inhibition on the metabolic dynamics, especially on the flux of ethanol as the main product of the fermentation system. This research is conducted to determine the flux and dynamics of metabolites which will lead to the regulation of glucose uptake and its metabolism.

Keywords: Fermentation System; Feedback Inhibition; Kinetic Modelling; Stability Theory


269

Topic: Mathematics

[ABS-229] Individual Tribe Determination Algorithm on a Matrilineal System

Susila Bahri, Nova N.B

Department of Mathematics, Andalas University

Abstract

At this paper, an algorithm will be constructed to determine the tribe of each individual in Minangkabau society in West Sumatra, Indonesia. Each individual tribe is obtained from inter-ethnic marriages. Inter-tribal marriage follows a matrilineal system. The algorithm begins by setting a persons tribe or Denai and marriage rules. In the algorithm, the tribe of other family members is determined from either of the two. The algorithm is then used to construct a family member determination program with Matlab

Keywords: individual tribe, algorithm, Matlab, matrilineal system

[ABS-251] Smaradanche Q-fuzzy Ring

Fatmawati Hidayat (a*), Marjono (b), Noor Hidayat (b)

Departement of Mathematics, Faculty of Mathematics and Natural Sciences, Brawijaya University, Jalan Veteran, Malang 65145, Indonesia

*[email protected]

Abstract

In this paper we will developed about the concept of Smarandache Q-fuzzy semigroups, wich we shortly denote as S-QFS to Smarandache Q-fuzzy rings (S-QFR). A fuzzy subset μ of a field P from ring R is called a Smarandache fuzzy rings (S-fuzzy rings) relative to P of R if μ(x-y)≥min{μ(x),μ(y) and μ(xy^(-1))≥min{μ(x),μ(y) where y≠0 ∀x,y∈P. Further we investigate some of their properties specially in subring of S-QFR and ideal of S-QFR

Keywords: S-QFS,S-QFR, subring of S-QFR and ideal of S-QFR


270

Topic: Mathematics

[ABS-236] Global Stability and Sensitivity Analysis of SIA Model for AIDS Disease

Fadilah Ilahi and Nurhalimah

UIN Sunan Gunung Djati Bandung

Abstract

Over the years, cases of HIV and AIDS spread throughout Indonesia and continue to increase [1]. This is becoming a serious concern so it requires a management or strategy to reduce its spread. In this article, a simple mathematical model will be built that represents HIV AIDS cases in general. The population assumed to be closed population and consisted of SIA (Susceptible, Infected, and AIDS case) population. Furthermore, this model will be analyzed through basic reproduction number (R_0), global stability using Lyapunov function [2], [3], and also sensitivity analysis from each parameters [4], [5]. The result of analysis and simulation shows that the rate contact between susceptible and infected is one of the most influential parameters in the spread of AIDS.

Keywords: HIV, AIDS, sensitivity analysis, global stability


271

Topic: Medical and pharmaceutical sciences

[ABS-14] Molecular Modeling of Porphyrin Derivatives as Bcl-2 Inhibitor

Muhammad Arba (a*), Sunandar Ihsan (a), Yamin (a), Daryono Hadi Tjahjono (b)

(a) Faculty of Pharmacy, Halu Oleo University, Kendari, Indonesia, 93232 *[email protected]

(b) School of Pharmacy, Institut Teknologi Bandung, Bandung, Indonesia, 40132

Abstract

The deregulation of antiapoptotic protein Bcl-2 found in tumor cells has encouraged the discovery of Bcl-2 inhibitors for many years. Herein, we report computational investigation on the potential of porphyrin compounds as Bcl-2 inhibitor. The binding modes of porphyrin in the active site of Bcl-2 was predicted using molecular docking approach of AutoDock 4.2, while conformational stabilities of complex were verified by performing molecular dynamics simulation using Amber16 package. The porphyrin compounds were bound to the active site of Bcl-2 and each complex was preserved during 50 ns MD simulation. Prediction of free energy binding using MM-PBSA technique revealed the potential of mono-H2PyP-AQ as Bcl-2 inhibitor as indicated by its low binding energy. In addition, van der Waals interaction which associated with the hydrophobic core of porphyrin appeared to determine the binding porphyrin to Bcl-2.

Keywords: porphyrin, Bcl-2, molecular docking, molecular dynamics simulation, MM-PBSA


272


[ABS-15] Virtual Screening for Identification of β5 Subunit of 20S Proteasome

Muhammad Arba (a*) , Andry Nur-Hidayat (a) , Sandra Megantara (b), Slamet Ibrahim Surantaadmaja (c), Daryono H Tjahjono (c)

a) Faculty of Pharmacy, Halu Oleo University, Kendari, Indonesia, 93231 b) Faculty of Pharmacy, Padjajaran University, Jatinangor, Indonesia

c) School of Pharmacy, Bandung Institute of Technology, Bandung, Indonesia, 40312

Abstract

Overexpression of proteasomes which leads to cancer progression has encouraged the development of proteasome inhibitor for several decades. In the present study, identification of inhibitors of β5 subunit of proteasome was done by performing a pharmacophore-based virtual screening using ZINCPharmer and molecular docking using iDock. The pharmacophore features which were developed using one hydrogen bond donor, two hydrogen bond acceptors, and one hydrophobic feature of cognate ligand of proteasome, was utilized to screen ZINC database. The retrieved virtual hits were subjected to molecular docking analysis and the best six hits were verified using molecular dynamics (MD) simulation. The current study identifies 5 best hits having good binding potentials as predicted by molecular mechanics Poisson-Boltzmann Surface Area (MM-PBSA) method, which indicated their potential as proteasome inhibitors.

Keywords: MM-PBSA; molecular docking; molecular dynamics simulation; pharmacophore model; proteasome; virtual screening


273


[ABS-35] Optimization of Coulometric Microdevice for Protein Detection Based

on Metallization Principle

Isa Anshori (*)

Biomedical Engineering Research Group, School of Electrical Engineering and Informatics, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Optimization strategies for the protein detection on coulometric microdevice based on metallization principle was presented. The coulometric microdevice detection principle comes from the concept of metallization where the information of analyte in a one reaction chamber was measured by the amount of deposited metal in an another chamber. Protein was detected by using the immunoassay (ELISA) method. Several strategies to improve the performance of coulometric microdevice from the previous work were explained. The strategies focus on the reduction of the background/noise by modifying the structure of the device and optimizing the blocking condition to minimize non-specific absorption on the electrode where the ELISA procedure was conducted. These strategies successfully give an improvement on the device sensitivity.

Keywords: Protein detection; Lab on Chip; Coulometry; Metallization


274


[ABS-49] Reverse transcriptase inhibitor resistance among HIV infected people

with viral load > 10,000 copies/mL in Nabire, Jayapura, and Jayawijaya, Papua Province

Hotma Martogi Lorensi Hutapea, Eva Fitriana, Evi Iriani Natalia

Balai Penelitian dan Pengembangan Kesehatan Papua

Abstract

Background: Reverse Transcriptase (RT) Inhibitor has been proven to be effective in controlling HIV progression and transmission. However, drug resistance virus can inhibit the benefit of taking antiretroviral (ARV). Treated patients with viral load >10,000 copies/mL was assumed experiencing virologic failure due viral genetic mutation.

Objective: To obtain the RT inhibitor resistance and subtype distribution among ARV treated HIV-infected patients receiving RT inhibitor in Nabire, Jayapura, and Jayawijaya, Papua Province. Methods: A total of qualified 20 samples of antiretroviral therapy experienced patients with viral load above 10,000 copies/ml were collected. After RNA extraction, reverse transcriptase-nested PCR was performed by using primer sequence published by WHO. The final products were sequenced and then analyzed for drug-resistant mutations and subtypes.

Results: Drug resistant mutations were observed among the 15 (75%) subjects, five (25%) of them were identified as susceptible to reverse transcriptase inhibitor. The results showed the following subtypes among patients: A (5%), B (15%), and CRF01_AE (80%).

Conclusions: ARV therapy experienced patients with viral load > 10,000 copies/mL does not always associated to ARV resistance. The adherence rate of the patients should be monitored and evaluated since high viral load with no mutation on ARV treated patient is associated with very poor medication adherence.

Keywords: HIV, Reverse transcriptase inhibitor, Viral load > 10,000 copies/mL


275


[ABS-55] Effect of Action Observation in Enhancing Motor Imagery for BCI

Control System Exercise

Ogie Novrian Zulkarnain (a*), Lulu Lusianti Fitri (a), Suprijanto (b), Esmeralda Contessa Djamal (c)

a) Department of Biology, School of Life Sciences and Technology, Bandung Institute of Technology (ITB), Bandung 40132, Indonesia

*[email protected] b) Department of Engineering Physics, Faculty of Industrial Engineering, Bandung Institute of

Technology (ITB), Bandung 40132, Indonesia c) Department of Informatics, Faculty of Mathematics and Natural Sciences,

General Achmad Yani University (UNJANI), Cimahi 40531, Indonesia

Abstract

Brain-Computer Interface (BCI), which allowed communication between human brain and machine, is being developed as control system that use mental activity, such as motor imagery, as controller. The problem in BCI usage is relatively low viability since the brain signal sometimes is not strong enough to be processed by machine. The mirror neuron, which is evoked by action observation, has similar but stronger activity with motor imagery. The aim of this experiment was to examine the connection between mirror neuron and motor imagery. Six healthy males were involved in this experiment and split into 2 groups: control and experimental. The experimental group performed motor imagery exercise with action observation, while control group performed motor imagery exercise without action observation. The electroencephalogram (EEG) recorded the Mu wave (7-13 Hz) at the motor area of the brain of both groups when they did 3 motor imagery tasks: rest, walk, and jump. Power Spectral Density (PSD) were calculated from EEG to measure wave desynchronization value which indicated when PSD decreased from rest to walk or jump. Results shows that experimental group had greater Mu wave desynchronization value than control group. We conclude that mirror neuron has connection with motor imagery and may be used to enhance motor imagery strength in BCI usage exercise.

Keywords: BCI, EEG, Motor Imagery, Action Observation, Mirror Neuron


276


[ABS-254] Enzymatic Synthesis of Glyserol-Coconut Oil Fatty Acid and Glycerol-

Decanoic Acis Ester as Emulsifier and Antimicrobial Agents Using Candida rugosa Lipase EC 3.1.1.3

Sri Handayani (a*), Fadhilah Damayanti (a), Erin (a) , Siswati Setiasih (a), Sumi Hudiyono (a)

a) Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia

Abstract

In this study, glycerol-palm oil fatty acid and sucrose-palm oil fatty acid esters were synthesized enzymatically using Candida rugosa lipase EC 3.1.1.3 in n-hexane as solvent. Optimization of esterification reaction was carried out by varying the mole ratio of fatty acid to glycerol, ie 1:1, 1:2, 1 3 and 1:4, while fatty acid to sucrose were 1:0.2, 1:0.4, 1:0.6, 1:0.8. The highest conversion percentage was obtained at mole ratio 1:4 with the value of 42% for glycerol-palm oil fatty acid ester and at mole ratio 1:0.8 with the value of 24% for sucrose-palm oil fatty acid ester. The esterification products were characterized by using FT-IR. The FT-IR spectrum showed that the ester bond was formed as indicated at 1748 cm-1 for the absorption peak of C=O ester group of glycerol-fatty acid ester and 1748 cm-1 for sucrose-fatty acid ester. Both esters were then examined by antrimicrobial assay. The antimicrobial activity assay showed that glycerol-palm oil fatty acid ester cannot inhibit the growth of Staphylococcus epidermidis and Propionibacterium acnes, while sucrose-fatty acid ester have ability to inhibit the growth of Staphylococcus aureus but not for Eschericia coli.

Keywords: Ester synthesis; Lipase; Glycerol-palm oil fatty acid ester; Sucrose-palm oil fatty acid ester; Antimicrobial


277

Topic: Physics

[ABS-3] Non-linearity analysis for cosmological inflation model with minimal

and non-minimal coupling of scalar field from Horndeski theory

Getbogi Hikmawan (1), Agus Suroso (1,2) and Freddy P. Zen (1,2)

1) Theoretical Physics Laboratory, THEPI Division, Department of Physics, Faculty of Mathematics and

Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia 2) Indonesia Center for Theoretical and Mathematical Physics(ICTMP), Faculty of Mathematics

and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia

Abstract

In this work, we analyze the non-linearity aspect of the perturbations generated in early times for cosmological inflation model with minimal and non-minimal coupling of scalar field from Horndeski theory. We study the spectral index of the perturbations and tensor-to-scalar ratio and can be seen as the evidence for inflation for some responsible coupling constant. We get the sign of non-linearity from the spectral index and tensor-to-scalar ratio for this model, and this result can be analyzed further to find non-Gaussianity.

Keywords: Inflation, Horndeski Theory, Cosmology, perturbation, non-linearity


278

Topic: Physics

[ABS-4] Chaotic Behavior of Modified Hamiltonian Peyrard-Bishop-Dauxois

Model on DNA System

Trengginas E.P. Sutantyo (1*), D. Dwiputra (1), W. Hidayat (1,2) Freddy P. Zen (1,2)

1) Theoretical Physics Laboratory, THEPI Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,

Jl. Ganesha 10 Bandung 40132, Indonesia *[email protected]

2) Indonesia Center for Theoretical and Mathematical Physics (ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia

Abstract

DNA research has involved a variety of disciplines across fields, which work complementary and supportive with the tools of theory, model, and experiment. Physics provides a theoretical basis that can be used for experimentation, as well as developing new physical models. This physical model can explain the non-linear dynamics of DNA. In this study, DNA system was modeled by modifying the Peyrard-Bishop-Dauxois (PBD) model. The influence of the surrounding environment, namely thermal bath is added to the Hamiltonian PBD, in the form of time-dependent thermal friction and stochastic white noise. Both are represented through the Nose–Hoover–Langevin (NHL) thermostat. Equation motion formulations were obtained using analytical methods, to be solved using numerical methods. The results from numerical calculations are presented in phase space images to show chaotic behavior. The results are obtained that there is an increase in chaotic patterns along with the increase in temperature. In addition, results also obtained that there is a relationship between widening of base pair distance at any time with temperature, especially in the denaturation process.

Keywords: DNA PBD model, NHL thermostat, chaotic, denaturation


279

Topic: Physics

[ABS-5] The Parameterized Post-Friedmannian Framework for Nonminimal Derivative Coupling with General Cosmological Perturbation Metric

Agustina Widiyani (1*), Agus Suroso (1,2) and Freddy P. Zen (1,2)

1) Theoretical Physics Laboratory, THEPI Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,


2) Indonesia Center for Theoretical and Mathematical Physics(ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia

Abstract

We study the parameterization of cosmological model where derivative of an additional scalar field coupled to curvature tensor. We extend the Parameterized Post-Friedmannian framework for interacting dark energy theories to the model. Starting from general cosmological perturbation metric, we derive perturbed energy-momentum tensor for scalar field and parameterized the tensor. Based on the value of the parameters, we compare the model with relevant models in current literature.

Keywords: Parameterized Post-Friedmannian framework, Cosmology, perturbation, scalar field


280

Topic: Physics

[ABS-6] Driving the Dephasing Assisted Quantum Transport

Donny Dwiputra (1*), Albertus Sulaiman (2,3), Wahyu Hidayat (1,3), and Freddy P Zen (1,3)

1) Theoretical Physics Laboratory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung, 40132, Indonesia

*[email protected] 2) Badan Pengkajian dan Penerapan Teknologi, BPPT Bld. II (19 th floor), Jl. M.H. Thamrin 8,

Jakarta 10340 3) Indonesian Center of Theoretical and Mathematical Physics (ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung Jl. Ganesha no. 10 Bandung, 40132, Indonesia

Abstract

Nontrivial quantum effects in biological systems are of high interest among physicists over the past decade. They allow for information and energy to be exchanged with near-unity efficiency although hindered by the warm, wet, and noisy environment. Several models suggests that the efficient quantum energy transport is due to the interplay between dephasing dynamics and unitary evolution of the disordered biological systems i.e in photosynthetic complex. However, the proposed models have not yet included the driving force depicting the external perturbation used in the experiment such as laser in 2D spectroscopy involved in the detection of exciton transfer in the quantum transportation complex. Here, we resolve this issue by subjecting the dephasing assisted transport model by Plenio and Huelga [New J. Phys. 10, 11 (2008)] to a driving force. We analyze dynamical evolution and dependence of temperature of the driven system.

Keywords: Open quantum systems, quantum information, quantum transport, quantum biology


281

Topic: Physics

[ABS-262] Word of Mouth Innovation Diffusion

Mohamad Mulkinugraha, Sparisoma Viridi

Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract

Diffusion of ideas, innovation and many other forms of interest has not only managed to plague humanity but also confound us due to their spontaneous nature. People around the world has used many means (innovation diffusion, heat diffusion, bass theory, agent-based model) to understand and find the underlying law behind such phenomenon. This thesis strives to understand the general outline through computational simulation, C++ program and the correlation between internal influence (q) and external influence (p). These two variables denote an agent’s interaction between itself and the environment as it constitutes of the agent’s social network (peer to peer connection) and outside influence (advertisement). During a competitive scenario, an interesting phenomenon occurred, when both influence values are the same magnitude, the adoption ratio is about 60:40.

Keywords: Innovation Diffusion, Heat Diffusion, Bass Theory, Agent Based Model


282

Topic: Physics

[ABS-7] Ernst Potential of Near-Horizon Extremal Kerr Black Holes

M. F. A. R. Sakti(a*), A. Irawan(a), A. Suroso(a,b) and F. P. Zen(a,b)

(a)Theoretical Physics Lab., THEPI Division, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung, 40132, Indonesia

*[email protected] (b)Theoretical Physics Lab., THEPI Division, and Indonesia Center for Theoretical and

Mathematical Physics (ICTMP), Institut Teknologi Bandung, Jl. Ganesha 10 Bandung, 40132, Indonesia

Abstract

One way to find the solution of black holes is through the Ernst equations that is quite simple instead of solving the Einstein equation. Solution of Ernst equations for Kerr and Kerr-Newman black holes have been achieved in the last century. The magnetized case for those black holes and their Ernst potentials can be found using Harrison-like transformation. Herein the Ernst potential for extremal rotating Kerr and its magnetized solution is shown. In the end, we also extend this fashion for extremal Kerr-Newman black hole.

Keywords: Ernst solution; black holes; magnetized solution


283

Topic: Physics

[ABS-8] Triangular inequality for 3d Euclidean manifold in loop quantum

gravity

Idrus Husin (a*), Ignatius Sebastian (a), Seramika Ariwahjoedi (a) and Freddy P. Zen (a,b)

(a)Theoretical Physics Laboratory, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha no. 10 Bandung, 40132, Indonesia

*[email protected] (b)Indonesian Center of Theoretical and Mathematical Physics (ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha no. 10 Bandung, 40132, Indonesia

Abstract

Loop quantum gravity starts with restating general relativity formulation in Ashtekar variable and discretizing manifold. The quantization then follows the Dirac procedures, with the states of space quanta belong to Hilbert space. Spin network states has become the basis state of space quanta in loop quantum gravity. In 3d Euclidean manifold, we can choose triangular discretization in the foliation. In classical Euclidean geometry triangle satisfy triangular inequality. In these paper we show that even at the level of space quanta, this inequality still hold.

Keywords: Loop quantum gravity, length operator, spin-network, quantum geometry


284

Topic: Physics

[ABS-10] Spectral Analysis of Volume Operator in Loop Quantum Gravity for

Kinematical Case

Ignatius Sebastian (a*), Idrus Husin (a) , Seramika Ariwahjoedi (a), and Freddy P. Zen (a,b)

a) Theoretical Physics Laboratory, THEPI Division, Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung,


b) Indonesia Center for Theoretical and Mathematical Physics(ICTMP), Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10 Bandung 40132, Indonesia

Abstract

Loop Quantum Gravity has become one of the alternative solutions to quantum gravity. This formulation introduced new operators which successfully used to model that in the quantum size, the space is actually discretized in the order of Planck length. These operators are area and volume operator. The regularization process of these operators came from the classical definition of area and volume, thus, the eigenvalues of area operator and volume operator are respectively the area and volume of the measured space. However, generally, there are two types of volume operator, the Ashtekar-Lewandowski operator and the Rovelli-Smolin operator. The significant difference between these two operators is the fact that Ashtekar-Lewandowski operator is sensitive to the direction of the spin network’s link, while Rovelli-Smolin operator is not. This difference will produce different spectral. To compare the resulting spectral, both operators will be used to measure the volume of the monochromatic 4-valent and 6-valent spin network for the kinematical case in this paper.

Keywords: Loop Quantum Gravity; Spin Network; Volume Operator


285

Topic: Physics

[ABS-268] Quasiparticle electronic structure of ZT-MoS2 within GW

approximation

Ahmad Syahroni, Adam B. Cahaya, Muhammad Aziz Majidi

Department of Physics, Universitas Indonesia, Depok 16424, Indonesia

Abstract

Two-dimensional transition metal dichalcogenides, such as MoS2, exhibit several polymorphs, namely semiconducting H, metallic T, and semi-metallic ZT. Recent experiment [Xinmao Yin et al., Nat. Commun. 8, 486 (2017)] showed an inverted gap of 0.5 eV and a fundamental gap of 0.1 eV in the absorption spectrum of the semi-metallic ZT-MoS2. We carry first-principles calculations on the electronic band structure of ZT-MoS2. Since the transition across the fundamental gap occurs at a non-high-symmetry k-point, the choice of k-point sampling is crucial. Our converging result regarding k-point sampling shows that two bands touch at Fermi energy. It indicates the absence of a fundamental gap. We report that spin-orbit interaction induces an opening of this fundamental gap of about 0.02 eV, one order of magnitude smaller than the gap observed in the experiment. We calculate the quasiparticle electronic band structure within the GW approximation to determine how the electron-electron interaction can influence the fundamental gap.

Keywords: Two-dimensional MoS2, semi-metal, band structure, GW approximation


286

Topic: Physics

[ABS-38] The Changes of Cilinders Shaped Wet Granulars Structure During

Heating Process

Zahrotul Firdaus Tri Wahyu Lestari, Sparisoma Viridi


Abstract

Granular material is a collection of macroscopic particles, such a sand or glass beads, which are visible to naked eye. The effect of liquid in between granular makes the character of granular changes. because of that, granular material can be divided into two groups, dry granular and wet granular. One of the most differences between them is the maximum angle that can reach of material structure. Wet granular can make angle 90 degree or more, and dry granular can make angle until 35 degree. Drying wet granular material can make the angle of granular changed. Drying granular can be done by heating sample of wet granular with cylindrical shape. Temperature of heating is kept on stability, it makes the changing of structure can be observed. Observation structure of wet granular became the base of computational modelling. Modeling sample is done in 2 dimensions by arranging granules into rectangles with a certain height. The liquid bridge in the granular is modeled with a spring, so for every 2 second, the spring disappears. This change models the evaporation process in the heated wet granular. The modeling results show that the final structure of the sample is a granular pyramid. The final structure of the sample is similar to the structure in the final structure of the sample in experiment in the form of sand pile.

Keywords: Critical Angle, Decreasing of Water Content, Dry Granular, Heating, Sand Pile, Structure, Wet Granular


287

Topic: Physics

[ABS-295] Optical Characteristic Properties of Yakult Drink Using UV/Vis

Spectrophotometer and FTIR

Rizqa Sitorus (a), Herman (b), Hendro (c*)

a) Physics Teaching, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Physics of Magneticsm and Photonics, Faculty of Mathematics and Natural Sciences,

Bandung Institute of Technology, Indonesia c) Theoretical High Energy and Instrumentation, Faculty of Mathematics and Natural Sciences,

Bandung Institute of Technology, Indonesia

Abstract

This research aims to qualitatively observe the light absorption response from Yakult to several spectra of electromagnetic waves. This absorption response will later be associated with Yakults physical properties. The observation is carried out with different techniques depending on the tools used. For observation in the infrared region, Bruker ATR Alpha FTIR Spectrometer was used. While The observations in the UV and visible light area were used Thermo Scientific Evolution 220 UV-Visible Spectrophotometer with Diffuse transmittance technique. The recording time was done until there is a change in Yakults absorption. Furthermore, additional recordings from expired Yakult. The measurement results obtained were in the form of the transmittance spectrum of the wavelength. Measurements in the infrared region showed some yakult content such as protein at ~ 6123 nm and lactose at ~ 9532 nm, in the UV region was associated with the reduction amount of protein while visible light region was associated with changes in the constituent particles of Yakult along with changes in pH. All observations refer to the literature. The results of this observation certainly do not represent all the contents of Yakult but they can be used as a reference to find out the safe time in consuming Yakult. This observation can be used not only on Yakult but also similar drinks that have milk content.

Keywords: Diffuse transmittance, FTIR, UV / Vis spectrophotometer, and Yakult


288

Topic: Physics

[ABS-299] DESIGNING A LOW-COST SURFACE PLASMON RESONANCE (SPR) INSTRUMENT FOR MONITORING DEGRADATION OF

MILK QUALITY

Ahmad Zatnika Purwalaksana (a), Brian Yuliarto (b), Hendro (a*)

a) Department of Physics, Faculty of Mathematics and Natural Science, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected] b) Department of Engineering Physics, Faculty of Industrial Technology, Bandung Institute of

Technology

Abstract

A design of a low-cost SPR instrument has been made to monitor the degradation of milk quality. The cost-production of the SPR instruments is much more economical, namely around IDR 10,000,000 where the price of commercial SPR instruments such as nanoSPR6 is $ 9,950. The main components of the instrument are consist of an Arduino Uno microcontroller, red laser, polarizer, stepper motor, prism, gold chip, and a cell phone camera. The light detection system of the instruments is using image processing that utilizes recorded data from the cell phone camera programmed with python software. The sample in this research used is pasteurized milk. The measurement results obtained from the SPR instruments are compared with nanoSPR6. The sensorgram result from the monitoring of pasteurized milk using both SPR instruments for 12 hours and nanoSPR6 for 4 hours has experienced a decrease in light intensity. The light intensity had decreased up to 8 hours from the time of observation and remained flat for the next 4 hours. This decreased intensity states that there is a shift in the angle dip during the monitoring process. This explanation is supported by track mode measurement data by nanoSPR6 that run for 2 hours, showing a change in the angle dip from 67.34º to 67.6º. The increase in angle dip during the monitoring process is suspected to be due to the appearance of fatty deposits in milk which results in an increase in the milk refractive index. The change of the milk refractive index within 2 hours is 0.0023 obtained by a fitting process using the Winspall software.

Keywords: Monitoring; Python; Sensogram; Pasteurization; Milk; SPR


289

Topic: Physics

[ABS-302] GAS DETECTION USING SURFACE PLASMON RESONANCE METHOD FOR CHARACTERIZATION OF GAS REFRACTIVE

INDEX PRODUCED BY MILK

Asri Setyaningrum (a*), Brian Yuliarto (b), Hendro (c)

(a) Physics Teaching, Faculty Mathematics And Science, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

The changes of refractive index from gas produced by milk have been monitored using SPR method. The sample preparation in this experiment is milk placed in the container then the gas from milk channeled to the detector chamber. Experiments were performed to obtain information of the SPR curve and sensorgram. Through the SPR curve, the dip shift information is obtained from an angle of 43.950 to 44,366. The angular value information was then analyzed using the forward modeling method and obtained the refractive index changes of gas produced by milk from 0.9999 to 1.0180. From sensorgram, it is obtained information the changes of reflectance and angular value with time. These changes indirectly indicate the interaction between compounds in milk with the outside bacteria. The further outlook for this research is that it can be developed to determine the decrease in the quality of milk.

Keywords: SPR, Milk, Gas


290

Topic: Physics

[ABS-51] Global Existence of Maxwell Klein-Gordon Theory with General

Couplings

Mulyanto (a*), Fiki T. Akbar (a), and Bobby E. Gunara (a)

(a) Theoretical Physics Laboratory, Departement of Physics Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

*[email protected]

Abstract

In this paper we prove the global existence of Maxwell Klein-Gordon equation (MKG) with general couplings in 4-dimensional Minkowski space. We start with the Lagrangian of electromagnetic and complex scalar field with addition of general couplings. Then, we get the solution in form of its curvature using spherical means method for nonlinear wave equation. The solution is bounded by the energy using L-∞ estimates. For the sake of simplicity, we also use the temporal gauge condition. The result show that the solution is not blow up in finite time. For complete proof of global existence, we show that norm (H2 × H1) in form of “energy” is not also blow up in finite time.

Keywords: Existence, Energy Estimates, Maxwell Klein-Gordon


291

Topic: Physics

[ABS-52] Tumor Control Probability (TCP) And Normal Tissue Complications

Probability (NTCP) with Consideration Of Cell Biological Effect

Rany Nuraini (a*) and Rena Widita (a)

(a) Biophysics Research Group, Departement of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung

*[email protected]

Abstract

In radiotherapy, tumor control probability (TCP) is a parameter used to calculate the percentage of tumor killing, while its effect on normal tissue damage describe by normal tissue complication probability (NTCP). Both TCP and NTCP depend on fractionation and cell biological effects such as repopulation, repair, redistribution and reoxygenation. It also depends on the statistical distribution model used. One model that can review the biological effects of cells is the Poisson model. In this research, we modified the Poisson model by considering the four biological effects mentioned above on TCP and only the effect of repair on NTCP. The objective of this research is to analyze what the most dominant effect that influences TCP value and the effect of considering the repair of normal tissue on NTCP. The results show that the effect of repair and repopulation cause tumor cells difficult to be erased completely while the effects of resenitization (reoxygenation and redistribution) can facilitate tumor cells to die. It can be seen that the most dominant biological effect is the repair effect on the tumor. This effect can be minimized by reducing the length of dose deliver time. Furthermore, the repair effect on normal tissue can reduce the value of NTCP about 9% compared with other models. By using the ISO-NTCP curve we also get the spinal cord repair time after 15 hours.

Keywords: Poisson model, Tumor Control Probability, Normal Tissue Complication Probability, cell biological effects


292

Topic: Physics

[ABS-316] The Influence of Light Wavelengths toward The Growth of Brassica

rapa L

Rizky Maiza, Daniel Kurnia

Bandung Institute of Technology

Abstract

This research aims to analyze the influence of wavelength from light source on growth of Brassica rapa L (pakcoy). The lamps used in the research were 11 watt UV light, 8 watt white LED light, red LED light, green and blue 3 watt LED lights, and 150 watt infrared light, placed in boxes except infrared one. The irradiation was done in the cropping room made from cardboard with size of 23 cm × 27 cm × 40 cm for 9 hours every day. The measurement done was a biometric measurement by measuring stem height, leaves width and their numbers. The observations were done for 14 days starting from the first day of planting. From the measurement result, the pakcoy can grow well on 8 watt white LED light. While in other light sources, it cannot grow well due the lack in wavelength needed by the plant. The experiment was further carried out by combining white LED light with blue, red and UV. The cropping room was made larger with a size of 40 cm × 27 cm × 46 cm. The experimental result showed that all pakcoy plants can grow well. The lighting by using a combination of lights was useful in the development and the growth of pakcoy. From the three treatments, pakcoy with white LED light and UV showed its faster growth for width, length and number of leaves.

Keywords: Light, wavelength, Brassica rapa L


293

Topic: Physics

[ABS-317] Coupling Parameter Constrain of Nonminimal Derivative

Coupling(NMDC) of Scalar Field Cosmology Using Strong Energy Condition in Modified Einstein Theory

Muhammad Rizka Taufani, Agus Suroso, Freddy Permana Zen

Intitut Teknologi Bandung

Abstract

The study aims to determine the constrain of the coupling parameter ξ of nonminimal derivative coupling theory(NMDC) of scalar field. The calculation of the parameter was build from the strong energy condition combined to modified Einstein theory (i.e. the scalar filed act as the external source of gravity beside the ideal fluid). Resulting two equations that consist of of energy density ρ and the momentum p, then one defined the deacceleration q to these equation. The present value of cosmological constant such as Hubble constant H, q, and scale factor a was put into the equations to determine the boundary. The results are the parameter must be 𝜉𝜉 ≥ 9.56 × 1033~𝑡𝑡2 so the NMDC theory is valid for the strong energy condition.

Keywords: energy condition, modified einstein theory, NMDC


294

Topic: Physics

[ABS-318] Combinatorial flow induced by quantum walks

Yusuke Higuchi* and Etsuo Segawa**

*Showa University **Yokohama National University

Abstract

The Grover walk is represented by the unitary iterations on the Hilbert space labeled by the symmetric arc set of a given graph. We consider the infinite graph which is obtained by adding semi-infinite paths to a finite connected graph. We keep injecting flows from this infinite paths to the internal graph. Then we show that this dynamical system converges to the unique fixed point. Since the dynamics restricted to the internal graph is no longer normal operator, we need to take a generalized eigenproblem, and to show this. As a speciality of Grover walk, we show that the global scattering reproduces the local scattering. Moreover the stationary state is expressed by a combinatorial flow. Moreover the combinatorial flow is orthogonal to the invariant subspace which is generated by the fundamental cycles of the internal graph. Such a combinatorial flow is determined uniquely.

Keywords: Quantum walk; Flow; Fundamental cycle


295

Topic: Physics

[ABS-72] Development of Internet of Things (IoT) Technology and Its

Applications on Room Cooling System

Joshua Dwi Prasetyo (a*), Husein (a**), Maman Budiman (a***)

a) Laboratorium Internet of Things, Kelompok Keilmuan Fisika Teoretik Energi Tinggi dan Instrumentasi, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung,

Jl. Ganesha no. 10 Bandung, Indonesia, 40132 *) [email protected]

**) [email protected] ***) [email protected]

Abstract

Internet of Things is a cyber physical system, a system which can conclude some information from big data and use them for feedback so that system can adapt well to the change in its environment. Internet of Things has many applications in this modern world, one of them is in energy management. In this research, Internet of Things is applied on room cooling system. The room cooling system works with fuzzy logic control so that it can adjust the time for on-off state of the system. Temperature data obtained by the system is processed to obtain physical quantities, which are thermal characteristics, which can be used to determine when the system must goes on/off. In this research, variations of control, which are variation of configuration type, variation of how long the system goes on/off in triangle configuration, and variation of width of the triangle configuration have been conducted. Analysis of the thermal characteristics of the room has also been done.

Keywords: Internet of Things, Room cooling system, Fuzzy logic, Thermal characteristics, Heat capacity, Thermal Resistance


296

Topic: Physics

[ABS-76] Fast forward of adiabatic spin dynamics : An application to quantum

annealing model in triangle spin systems

Iwan Setiawan, Bobby Eka Gunara, Katsuhiro Nakamura

Physics Education Department University of Bengkulu Physics Department Institut Teknologi Bandung

Department of Applied Physics, Osaka City University Japan Faculty of Physics, National University of Uzbekistan

Abstract

We propose a scheme of the fast forward of adiabatic spin dynamics and it’s application to quantum annealing model in triangle spin systems. We settle the quasi-adiabatic spin dynamics (QASD) by adding the regularization terms to the original Hamiltonian and accelerate it with use of a large time-scaling factor which realizes QASD on shortened time scale. Assuming the candidate regularization Hamiltonian consisting of pair-wise exchange interactions and magnetic field, we solved the regularization terms. These terms multiplied by the velocity function give the state-dependent counter-diabatic terms (CDTs) for each of adiabatic states. Our fast forward Hamiltonian proves to generate state-dependent CDTs due to the driving pair-wise interactions and driving magnetic field . Applying this scheme to quantum annealing model, we find CDTs which contains both two-body interaction and magnetic field. The driving two-body interaction in the fast-forward scheme guarantees the complete fidelity of accelerated states.

Keywords: Fast forward, adiabatic spin dynamics, qantum annealing


297

Topic: Physics

[ABS-136] Determination of Environmental Condition in Pelita Harapan

University Based on Radon Concentration Analysis

L.Cahyadi(1), Julinda Pangaribuan(2), Junita(2) and K.V.I. Saputra(1)

1)Mathematics Department, 2)Electrical Engineering, Universitas Pelita Harapan Jl. Thamrin Boulevard 1100, Lippo Karawaci-Tangerang, 15811 Indonesia

Abstract

Radon Gas is the largest contributor to the annual effective dose received by humans, which is colorless, tasteless, and invisible to the eye. This gas is harmful and can cause lung cancer. Thus, we try to study the average concentration level of Radon Gas in 20 workspace rooms in two different buildings located at the same altitude that mostly made of different building materials. First are HRD workspace rooms in building A that are mostly partitioned and enclose with cemented walls and glasses. Second are FaST workspace rooms that are partitioned and enclose with gypsum. All of the rooms are equipped with air conditioner and have lack air circulation. The concentration of radon gas is measured by a passive radon dosimeter equipped with a CR-39 detector. The detectors are placed in those 20 workspace rooms of Pelita Harapan University for 3 months.

Radon gas levels obtained ranged from 37.95 ± 2.68Bq/m3 to 91.07 ± 6.44Bq/m3 with an average value of 58.39 ± 4.13Bq/m3. In average, concentration of Radon gas in offices at FaST is 67.543±4.775Bq/m3, which higher than average concentration of Radon gas offices at HRD that is 49.244±3.741Bq/m3. The higher concentration of Radon gas that is 91.07 ± 6.44Bq/m3 is found in room named FaST 1, which have lack air circulation, enclose in 4 sides with gypsum, and packed with boxes. The lowest concentration of Radon gas that is 37.95±2.68Bq/m3 is found in room named FaST 7, which enclose in 4 sides with glasses and contains only several tables and chairs. Yet, the measured concentration of Radon gas is still below the threshold recommended by the International Atomic Energy Agency (IAEA), which is 1000Bq/m3.

Keywords: Radon, Radon Dosimeter


298

Topic: Physics

[ABS-175] Network Analysis of Saccharomyces Cerevisiae

Florentin Anggraini Purnama, Widya Meiriska, Dimas Praja Purwa Aji, Devi Aprianti, Sparisoma Viridi

Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jalan Ganesa 10, Bandung 40132, Indonesia

Abstract

The pattern of yeast budding formation is essential in colony expansion. By exploring how yeast colony forms, the distinction of pathological and non-pathological cells can be further understood. These distinctive features can be translated into the abstract concept of complex network. Characterization was determined by the degree distribution and the rate of proliferation. A model based on these characteristics was then built. In the model, cells are treated as circular particles connected by a predefined force network.

Keywords: Biological network; Characterization; Force network; Saccharomyces Cerevisiae


299

Topic: Physics

[ABS-186] Inflation model due to non-minimal coupled Higgs to the Starobinskys

modified gravity

Romy H. S. Budhi, Eko Tri Sulistyani, Moh. Azam Alwan

Universitas Gadjah Mada

Abstract

In this study we elaborate an inflation model generated from non-minimal interaction between Standard Model Higgs at high energy scale to the Starobinskys modified gravity model. This model itself is motivated by the failure of the more simple model, the Higgs inflation model, to describe the interaction mediated by graviton at Planck scales. The key point of this problem is that the non-minimal coupling $\xi$ between the Higgs and the gravitational sector is taking too large number during inflationary phase. To solve the problem, we add additional order of scalar curvature in the action and analyse the effect to reduce the size of non-minimal coupling. Here we examine some limit predictions and its comparison to the latest observation constraints of the cosmic microwaves background radiation (CMB)

Keywords: Higgs inflation, Starobinsky model, modified gravity, CMB


300

Topic: Physics

[ABS-189] One-Dimensional Analysis of Magnetic Dipole Cylinder Inside An

External Magnetic Field

Bram Yohanes Setiadi*, Dr.rer.nat Sparisoma Viridi

Department of Physics, Bandung Institute of Technology, Jalan Ganesha 10, Bandung 40132, Indonesia

*[email protected]

Abstract

Electromagnetism has evolved from only a science into an unseparated part of our daily life, nowadays. One kind of benefit that still on development process is the use of magnetic field as a energy source of any physical movements. A movement analysis system was designed and built in this experiment. It consists of a solenoid, two cylinders made from acrylic and were injected by a chip magnet(s), and a rail track or container for the cylinder. The goal of this research is to observe and specify the types of movement which produce by the cylinder as a reponse of external magnetic field from the solenoids. The dependent variables include starting position and starting angle of the cylinder, the amount of magnet chip injected inside it, and the voltage used to supply the solenoids. Combinations between translational and rotational motion come as a result of this experiment, in other words, rolling motion. Rolling motion that observed is divided into two types, pure and with slipping, while rolling with slipping still divided again into translationan dominance and rotational dominance.

Keywords: Magnetic Dipole, Rolling, Rotation, Solenoid, Translation


301

Topic: Physics

[ABS-219] 𝒎𝒎+𝚲𝚲 and 𝒎𝒎+𝚺𝚺𝟎𝟎 photoproduction in view of new CLAS data

Terry Mart

Departemen Fisika, FMIPA, Universitas Indonesia

Abstract

The CLAS collaboration has recently released new data on kaon photoproduction off the nucleon for the single polarization observables 𝑃𝑃, 𝑆𝑆, and 𝑇𝑇, as well as the double polarization observables 𝑂𝑂𝑥𝑥 and 𝑂𝑂𝑧𝑧, in both 𝐾𝐾+Λ and 𝐾𝐾+Σ0 channels. In the case of 𝐾𝐾+Λ channel it has been shown in our previous study that the inclusion of these new data leads to dramatically changes in all extracted parameters. Thus, our previous study indicates that whether the new data are not compatible with the older ones or the present model is insufficient to explain the new data. To further study the effect of these new data, we continue our investigation to the 𝐾𝐾+Σ0 channel. To this end we use our multipole model for the 𝐾𝐾+Σ0 photoproduction. The result shows the same phenomenon. Therefore, the new data should be included in the future studies in order to draw a comprehensive conclusion on the kaon photoproduction off the nucleon.

Keywords: Kaon, 𝚲𝚲-hyperon, photoproduction, isobar model


302

Topic: Physics

[ABS-226] Isobar Model for Kaon Electroproduction

S. Sakinah(1) and T. Mart(1*)

Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia

* [email protected]

Abstract

Kaon electroproduction has been investigated by using an isobar model. The required propagators and vertex factors are obtained from our previous analysis. For the electromagnetic form factor we adopt the standard dipole one with the cuttoff considered as a free parameter. We include nucleon resonances with spin up 9/2. All nucleon resonances listed in the particle listings of Particle Data Group are considered in this investigation. The unknown parameters, including the electromagnetic and hadronic couplings, are extracted by fitting the predicted observables to the currently available experimental data.

Keywords: Kaon Electroproduction, form factor, isobar model


303

Topic: Physics

[ABS-231] k+Λ-k0Λ Photoproduction Studied by Using Isobar Model

Samson Clymton (a*), Terry Mart (a**)

a) Departemen Fisika, Universitas Indonesia, Depok 16424, Indonesia *[email protected]

**[email protected]

Abstract

We have investigated the neutral kaon photoproduction off a neutron by using an isobar model based on our previous study. The unknown parameters are extracted by fitting the model prediction to experimental data. We have fitted the two Lambda channels simultaneously. The results are compared to the experimental data as well as to those of previous studies in terms of predicted observables. We also compare the calculated properties of nucleon resonances with those obtained from the Particle Data Group.

Keywords: Neutral kaon, photoproduction, isobar model


304

Topic: Physics

[ABS-240] Structural and vibrational analysis of LaFe1-xMnxO3 (x = 0.05, 0.10,

0.15, and 0.20) nanoparticles

Aditya Wahyu Anugrah (a), Djoko Triyono (a*)

a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia *Corresponding author: [email protected]

Abstract

The LaFe1-xMnxO3 (x = 0.05, 0.10, 0.15, and 0.20) nanoparticles were prepared by sol-gel method. The analysis of X-ray diffraction (XRD) pattern confirmed the single phase orthorhombic structure (space group: Pnma) following by the decreasing of crystallite size and increasing of Fe/Mn-O-Fe/Mn bond angle with increasing of Mn-content. The presence of the Fe/Mn-O-Fe/Mn bending and Fe/Mn-O stretching has been confirmed by FTIR characterization in the wavelength 477 cm-1 and 536 cm-1, respectively. The vibrational modes have also been investigated by Raman scattering measurement revealing the existence of La-vibration (under 200 cm-1) and tilting of the oxygen octahedral (around 300 cm-1). The optical band gap energy, obtained by using Uv-vis spectroscopy employed Kubelka-Munk method, are in the range of 1.99 eV and 2.14 eV. The band gap increases with increasing of Mn-content.

Keywords: Sol-gel method; LaFe1-xMnxO3; Structure; Optical properties


305

Topic: Physics

[ABS-241] Structural Properties of Bismuth Ferrite Synthesized by Sol-gel Method

with Variation of Calcination Temperature

Muqtaf Najich Abdillah (a), Djoko Triyono (a*)

a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia


Abstract

The effect of calcination temperature (500°, 600° and 700°C) on structural and optical properties of 𝐵𝐵𝑇𝑇𝐹𝐹𝑒𝑒𝑂𝑂3 (BFO) that synthesized by sol-gel method was studied. The structure of BFO sample was investigated by using X-ray diffraction (XRD) and Raman scattering spectroscopy.The optical properties were studied using Fourier Transform Infrared spectroscopy (FTIR), and UV-visible spectrophotometry (UV-Vis). XRD result showed the hexagonal crystal structure with R3c space group. Single-phase BFO were obtained only for the sample calcined at temperature of 700°C. The second phase identified as 𝐵𝐵𝑇𝑇2𝐹𝐹𝑒𝑒4𝑂𝑂9 was identified for sample with calcination temperature of 500° and 600°C. Crystallite size, lattice parameter, atomic position, geometrical parameter such as bond angle and bond distance, tilt angle and tolerance factor for all sample were also investigated. The Raman spectroscopy observed 13 Raman mode for R3c structure of 𝐵𝐵𝑇𝑇𝐹𝐹𝑒𝑒𝑂𝑂3. Uv-Vis measurement shows the increasing of energy gap as calcination temperature increase. FTIR spectra confirm the present of Fe-O vibration mode around 530 cm-1 which also found in Raman spectra.

Keywords: 𝑩𝑩𝑻𝑻𝑭𝑭𝑭𝑭𝑻𝑻𝑭𝑭; Raman scattering; FTIR; energy gap


306

Topic: Physics

[ABS-242] The experimental investigation on the crystalline structure, lattice

vibration, and optical energy of La1-xBixFeO3 nanoparticles

Siti Nurmaida Fitria (a), Djoko Triyono (a*)



Abstract

Lanthanum bismuth orthoferrite (La1-xBixFeO3 with x=0.1, 0.2, 0.3, 0.4 and 0.5) nanoparticles have been successfully synthesized using sol-gel method. The crystal structure, lattice vibration, and optical energy analysis have been characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman scattering spectroscopy, and Uv-vis spectroscopy. The XRD revealed the single phase orthorhombic structure with Pnma space group. The crystallite size tends to decrease in the range of 130 − 298 nm with increasing Bi-content. The existence of Fe−O strectching mode and bending modes were investigated by FTIR spectra and also confirmed by Raman scattering analysis. The optical bandgap was investigated by UV-vis spectroscopy, which show that energy gap decreases with increasing Bi contents and the value of energy gap is about 1.98 eV to 2.08 eV. The decreasing energy gap will increase photo catalytic activity.

Keywords: Bi-doped; LaFeO3; Raman spectroscopy; IR; energy gap


307

Topic: Physics

[ABS-244] Magnesium substitution on site-B of Lanthanum Orthoferrite

nanoparticles: structural and optical properties

Umu Hanifah (a), Djoko Triyono (a*)



Abstract

The effect of Mg-substitution at Fe-site of perovskite type LaFeO3 on its structural and optical properties at room temperature have been investigated. The single-phase nanoparticle of LaFe1-xMgxO3 (x = 0.1,0.2 and 0.3) have been synthesized by sol-gel method. The significant effect of substitution on structural properties is obviously noticeable in the changes of the lattice structure and distortion which is also confirmed by Raman scattering and Fourier transform infrared (FTIR) spectrum in terms of the upward shift of tilt, bending, and symmetric stretching of the Fe/MgO6 octahedra vibration modes. In addition, the UV-Vis analysis revealed the decreasing of band gap energy with the increase Mg-content.

Keywords: Lanthanum Orthoferrite, sol-gel method, Magnesium, optical, structural


308

Topic: Physics

[ABS-245] Study of the lattice structure and optical band gap energy of La1-

xMgxFeO3 nanoparticles prepared by sol-gel method

Rianty Warto Utami(a), Djoko Triyono(a*)

a)Departement of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia


Abstract

In this work, we studied the effect of the Mg2+ doping on the lattice structure and optical band gap energy of La1-xMgxFeO3 (x = 0.1, 0.2, and 0.3) nanoparticle synthesized by sol-gel method. The nanoparticles were characterized by X-ray diffraction (XRD), Raman scattering spectroscopy, Fourier Transform Infrared spectroscopy (FTIR), and UV-vis spectrophotometry (UV-Vis). XRD analysis confirmed the single phase of (La,Mg)FeO3 orthorhombic crystal structure with Pnma space group for composition up to x =0.2. The second phase identified as MgFe2O4 was observed for the compound with x = 0.3 indicating the nanoparticle have achieved the solubility limit. Rietveld analysis has been performed to confirm the crystallography parameters including crystallite size, atomic position, volume of unit cell, density, bond angle, bond distance, tolerance factor and wyckoff factor. The crystallite size decrease with increasing Mg-dopant cause ion radius Mg smaller than La. The Raman scattering spectra shows eight modes vibration of (La,Mg)FeO3. All samples show decreasing scattering intensity due to increasing Mg dopant. The FTIR spectra confirmed the stretching vibration of Fe-O bonding modes with slightly shifted to higher wavenumber. Band calculation obtained from UV-Vis measurement by using Kubelka-Monk function show that Mg-substitution on La-site caused the decreasing energy gap in the range of 2.14 − 2.08 eV.

Keywords: LaFeO3; crystal structure; Raman scattering; energy gap


309

Topic: Physics

[ABS-255] Investigation on the lattice structure and optical energy of La0.8Sr0.2Fe1-xMgxO3 (x=0.1, 0.2, and 0.3) nanoparticles

D Triyono (a*), R A Rafsanjani (a)



Abstract

In this work, we focused on the investigation of the lattice structure and optical band gap energy of La0.8Sr0.2Fe1-xMgxO3 nanoparticles. The single phase La0.8Sr0.2Fe1-xMgxO3 (x = 0.05, 0.10, 0.15, and 0.20) nanoparticles have been successfully synthesized by sol-gel method. The substantial effect on the lattice structure and optical energy analysis have been observed. The analysis of X-ray diffraction (XRD) pattern reveled the single phase cubic structure with Pm3m space group following by the increasing of lattice parameter and crystallite size with increasing of Mg-content. The detailed structure such as lattice parameter, atomic position, bond length were investigated. The Mg-substitution dependent structural changes have also been confirmed by Fourier transform infrared (FTIR) spectrum in terms of downward shift of stretching mode (Fe/Mg−O) and Fe/Mg−O−Fe/Mg bending mode of vibrations. The optical band gap energy, obtained by using Uv-vis spectroscopy, have been found in the range of 1.05 eV and 1.35 eV and decreased with increasing of Mg-content.

Keywords: La0.8Sr0.2Fe1-xMgxO3; nanoparticles; X-ray diffraction ; FT-IR ; UV-Vis


310

Topic: Science of renewable energy

[ABS-301] Thermoelectric Performances of Ge0.99-xNa0.01AgxSe

Vivi F. Gustiani(a*), Liany Septiany(b), A.A. Nugroho(a), Graeme R. Blake(b)

a) Photonic and Magnetic Laboratory, Physics Departement, Institut Teknologi Bandung, Jl. Ganesha No.10, Bandung, 40132, Indonesia.

*[email protected] b) Solid State Materials for Electronics, Zernike Institute for Advanced Materials,

University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

Abstract

Doped GeSe has been theoretically predicted to have a low thermal conductivity yields a high figure of merit (ZT) of 2.5 at 800K[1]. However, the experimental study of thermoelectric performance of GeSe has less attention. Na-doped GeSe has been reported to reduce its thermal conductivity. Despite their ultra-low thermal conductivity, the Na-doped GeSe also shows a high resistivity due to the growth of Na-rich precipitates[2]. In order to suppress both thermal conductivity and resistivity, a co-doping of Ag was used. Structural characterizations of the doped samples show the presence of the impurity phase of graphite within the GeSe matrix. This impurity was obtained from the carbon-coated ampule during the synthesis. Further characterization using SEM indicate the presence of Ag and Na precipitation within the GeSe matrix. The resistivity decreases upon the increase of Ag concentration. However, the thermal conductivity only decreases in the small range of Ag doping of about 0.5%. On the other hand, the Seebeck coefficient remains constant at high temperature. Overall, the effect of the variation of Ag on the thermoelectric performances of the Na-doped GeSe is optimum around 0.5% concentration. [1] Hao, S., Shi, F., Dravid, V., Kanatzidis, M., Wolverton, C. Computational Prediction of High Thermoelectric Performance in Hole Doped Layered GeSe. Chem Mater (2016);28:3218-26. [2] Shaabani, L., Yamini, S. A., Byrnes, J., Nezhad, A. A., Blake, G. R. Thermoelectric Performance of Na-Doped GeSe. ACS Omega (2017), 2, 9192−9198.

Keywords: GeSe, Thermoelectric


311


[ABS-193] A FORMULA FOR ESTIMATING OCEAN WAVE POWER

Totok Suprijo, Indrawan Fadhil Pratyaksa, Nining Sari Ningsih

Coastal Oceanographic Laboratory, Faculty of Earth Sciences and Technology, Bandung Institute of Technology

Abstract

Many researchers have estimated ocean wave power and energy based on significant wave height data, however their estimation results have always been less than the calculated power and energy using field observation data. Therefore, a new formula for estimating ocean wave power is described in this paper. Using surface water elevation data set from laboratory experiments, the formula was derived. The laboratory experiment has been done in two dimensional wave tank with four probes for measuring water elevation in the tank. Four wave scenarios with different period and wave height have been considered. Data processing results from laboratory experiments reveal that estimation of wave energy using significant wave height or one third of highest measured wave height is underestimated by twenty percent to the measured one. Furthermore, the formula proposed in this study has been applied to estimate wave power in Jawa Sea. This estimation has been done using two days observation data. Results shows that estimation of wave energy or power using the formula proposed in this study has good accuracy.

Keywords: ocean wave energy, ocean wave power, marine renewable energy


312


[ABS-195] Preliminary Assessment of Tidal Stream Power Using 3-Dimensional

Hydrodynamic Model in the Lembeh Strait

Altof Naufal(a), Totok Suprijo(a), Mira Yosib(b), Del Yusar(b)

(a) Bandung Institute of Technology, Ganesha Street no 10, Bandung 40132, Indonesia (b) Pusat Penelitian dan Pengembangan Geologi Kelautan, Dr. Djunjunan no. 236, Bandung,

Indonesia

Abstract

This paper provides an preliminary assessment of potential energy of tidal currents in the Lembeh Strait, North Sulawesi. Using two and three dimensional ocean hydrodynamic model, the assessment was done. A nesting method has been applied in order to simulate tidal currents in the Sulawesi Sea and the Lembeh Straits. Three dimensional simulation results at the Lembeh straits was validated using observation data, which are obtained from filed measurement campaign on 3 to 23 April 2016. Estimation of tidal current or tidal stream power was focused in the Lembeh Straits. The simulation results show power density during a tidal cycle can reach maximum value about 72.346,23 W/m2 at full moon condition. This amount of power is stored at the area between Sarena Island and Sulawesi Island. Result of tidal stream power estimation also reveals strong tidal currents that associated with maximum power occur during flood tide condition.

Keywords: Lembeh Strait, 3D Hydrodynamic Model, Ocean Current, Ocean Current Energy

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