THE 6th IC–STAR 2020 Committee

Advisory Board

• Prof. Dr. Karomani, M.Si. – Rector of University of Lampung

• Prof. Hadi Nur – Universiti Teknologi Malaysia, Malaysia

• Prof. Toshiro Ohashi – Hokkaido University, Japan

• Prof. Naoya Kasai – Yokohama National University

Steering Committee

• Prof. Dr. Heryandi – Vice Rector, University of Lampung, Indonesia

• Dr. Asep Sukohar – Vice Rector, University of Lampung, Indonesia

• Prof. Dr. Yulianto – Vice Rector, University of Lampung, Indonesia

• Prof. Suharso – Vice Rector, University of Lampung, Indonesia

• Prof. Dr. Suharno – Dean of Faculty of Engineering, University of Lampung, Indonesia

• Dr. Lusmeilia Afriani – Director of Research Institute and Community Service of University of Lampung

• Dr. Irza Sukmana – University of Lampung, Indonesia

• Dr. Ahmad Zaenuddin – University of Lampung, Indonesia

• Prof. Norma Alias – Universiti Teknologi Malaysia, Malaysia

Organizing Committee

• Khairudin – General Chair • Ika Kustiani – co-chair • Bagus Sapto Mulyanto – Secretary, Public Relation, and Sponsorship

• A. Yudi Eka Risano – Treasurer

• Karyanto – Technical and Scientific Administration

• Dikpride Despa – Logistics and Appurtenance, Social and Excursion Program

• Gigih Forda Nama – Information and Conference Management System

• Tarkono – Information and Conference Management System

• Hery Dian Septama – Publication and Circulation

• Zulmiftahul Huda– Secretary Public Relation, and Sponsorship Team

• M. Ridho Ulya – Publication and Circulation

• I Gede Boy Darmawan – Technical and Scientific Administration Team

• Trisya Septiana – Logistics and Appurtenance, Social and Excursion Program Team

• Rahmat Catur Wibowo – Information and Conference Management System Team

• Yuli Darni – Treasurer Team

• Afri Yudamson – Information and Conference Management System Team

Scientific Committee

• Lukmanul Hakim – University of Lampung, Indonesia – chair

• Uceu Fuad Hasan – Helmholtz-Zentrum Geestatch, Germany – co-chair

• M. Karami – University of Lampung, Indonesia– co-chair

• Shirley Shavetlana – University of Lampung, Indonesia – co-chair

• Helmi Fitriawan – University of Lampung, Indonesia – co-chair

• Misfa Susanto – University of Lampung, Indonesia

• Lilis Hermida – University of Lampung, Indonesia

TPC Member

• Naseem Ahmed – Indian Institute of Technology Roorkee, India • Herman Halomoan Sinaga – University of Lampung, Indonesia

• Nining Purwasih – University of Lampung, Indonesia

• R.Y. Ferry Burhan – 10 November Institute of Technology, Indonesia

• Homero Toral-Cruz – University of Quintana Roo, Quintana Roo, Mexico

• Joy Rizky Pangestu Djuansjah – Universiti Teknologi Malaysia, Malaysia

• Taha Abd. El-Rahman – University of Sherbrooke, QC, Canada

• Edno Gentilho – Instituto Federal de Educação Ciência e Tecnologia do Paraná, Brasil

• Ainul Ghurri – Udayana University, Indonesia

• Cipta Ginting – University of Lampung, Indonesia

• Agus Haryanto – University of Lampung, Indonesia

• Udin Hasanudin – University of Lampung, Indonesia

• Basem Abu Izneid – Effate University, Saudi Arabia

• Naoya Kasai – Yokohama National University

• Mamoru Kikumoto – Yokohama National University

• Irdika Mansur – Bogor Institute of Agriculture, Indonesia

• Agung Mataram – Sriwijaya University, Indonesia

• Lee Meyer – University of Kentucky, USA

• Noor Danish Mundari – LPU, India

• Kaneko Nabuhiro -Yokohama National University, Japan

• RR. Poppy Puspitasari – Universitas Negeri Malang, Indonesia

• Chithra Reghuvaran – National Institute of Technology, Rourkela, Odisha, India

• Ahmad Saudi Samosir – University of Lampung, Indonesia

• Marialisa Scata – Universitas di Catania, Italy

• Diding Suhandy – University of Lampung, Indonesia

• Gatot Eko Susilo – University of Lampung, Indonesia

• Takahasi Susume – Kyoei University, Japan

• Gunasekar Thangarasu – University Teknologi Petronas, Malaysia

• Josaphat Tetuko – Chiba University, Japan

• Mokhamad Fakhrul Ulum – Bogor Institute of Agriculture, Indonesia

• Mustafa Usman – University of Lampung, Indonesia

• Dedy H.B. Wicaksono – Universiti Teknologi Malaysia, Malaysia

• Fathin Syaifurrahman – Bandung Institute of Technology, Indonesia

• M. Irsyad – University of Lampung, Indonesia

• Ageng Sadnowo – University of Lampung, Indonesia

Supporting Staff

• Muhammad Haviz

• Nugroho Ifadianto

• Ghazali MF

• Abdurrahman Effendi

• Ubaidah

• Siti Khalifah K

• Rahmat Bayu Setiawan • Yoel Gudmean Gultom

• M. Harbi Rai Pangestu

• Naufal Hasan • Redho Prayoga

• Ocazy Harun • Puji Ayuning L

• Salwa Nursalsabila • Chantika Anzarini

• Alfandi Wicaksono • Toha Hilpan Hamim

• Danar Ade Prayoga • M. Iqbal Hasan

• M. Reihan Putra A

IC-STAR

2020

Professor Ahmad Saudi S

Prof. Ahmad Saudi Samosir received his B.Sc. in Electrical Engineering from University of North Sumatera, Medan, Indonesia, in 1996. He obtained Master of Energy Electric Conversion from Institut Teknologi Bandung, Indonesia, in 1999, and PhDLorem Ipsufm rom Universiti Teknologi Malaysia in 2010. He is currently an assistant professor at Faculty of Electrical Engineering,

Universiti Teknologi Malaysia. Prof. Ahmad Saudi Samosir is the author and co-author of more than 30 publications in international journals and

proceedings. His research interests include power electronic converter and controller, renewable energy systems such as fuel cell, solar pv, wind energy and ultracapacitor

IC-STAR

2020

Professor Rizalman Mamat

Prof. Dr. Rizalman Mamat presently is Dean of Faculty Mechanical Engineering, Universiti Malaysia Pahang, Malaysia. He got Doctoral degree

from University of Birmingham, United Kingdom in fuel and energy. Previously, he obtained hLoreim Ispsum BSc and MSc from University Teknologi

Malaysia (UTM). His field research interest is Heat transfer, Combustion, Internal Combustion Engine, Alternative Energy, Computational Fluid Dynamics, Propulsion System. Prof. Dr. Rizalman Mamat was visiting Professor at Karlsruhe University of Applied Science Germany (2017),

Faculty of Engineering Universitas Abulyatama Aceh, Indonesia (2017), Faculty of Engineering Universitas Gajah Putih Aceh, Indonesia (2017),

Department of Mechanical Manufacture & Automation Ningxia University, Yinchuan, China (2016), Department of Mechanical Manufacture

& Automation Ningxia University, Yinchuan, China (2015).

IC-STAR

2020

Professor Sunny J Kalayathankal

Prof. Sunny J is a Professor and Dean (Research) in Jyothi Engineering College, Cheruthuruthy, Thrissur, Kerala, India approved by AICTE &

Affiliated to APJ Abdul Kalam Technological University. He was the former Head of the Department and Associate Professor in the Department of

Mathematics, K.E.College, Mannanam, Kottayam, Kerala, India. He has completed 33 years of teaching service, including 16 years of experience in

research activities. He graduated from University College,Thiruvananthapuram, Kerala University in 1986. He obtained his B. Ed., degree from Calicut

University in 1989, MPhil degree from Kerala University in 1993, the area of study being: Non- Negative Matrices. He secured his MCA degree from Indira Gandhi National Open University in 2002, completed his Ph.D. in Mathematics from Kerala University in 2010, the thesis was titled "Mathematical modelling

of change in space of surface water in a tropical river system - rain to repository". He has also a degree in M.Tech IT. He earned his second Ph.D. from Bharathiar University, Coimbatore in 2018, the thesis was titled "Fuzzy

Logic & Decision Making".

He is a Research guide in Bharathiyar, Karpagam and M.G.Universities in the South of India. There are eight research scholars under his guidance. His research interests are in the area of Graph theory , Fuzzy Modeling and

Decision Making, Fuzzy Data Mining, Fuzzy Graph, Neural Networks and History of Mathematics.

IC-STAR

2020

Professor Naoya Kasai

Prof. Naoya Kasai presently is Associate Professor of Faculty of Environment and Information Sciences, Division of Artificial Environment and Information, Yokohama National University.

The Best Research Achievement in his career is Published Thesis, Development of Amplifier Circuit by Active-Dummy Method for

Atmospheric Corrosion Monitoring in Steel Based on Strain Measurement 2018. He got Doctoral Degree from Yokohama National University, Division of Engineering, Departmentof Material Science and Chemical

Engineering. His field research interest is Social Systems Engineering/Safety Systems and he has acquired qualification

Healt Supervisor and Hazardous Material Handler.

IC-STAR

2020

Professor Gavin Brown

Prof G Brown is Associate Dean Postgraduate Research and the Director of the Quantitative Data Analysis and Research Unit in the Faculty of Education and Social Work. He also has joined appointments at

Affiliate Professor, in Applied Educational Sciences, at Umea University, Sweden and Honorary PLroremoIpsumfessor, in Curriculum & Instruction, at the

Education University of Hong Kong.

Dr Brown has been in academic positions since 2005 at the University of Auckland and the Hong Kong Institute of Education (2009-2011).

Prior to that he was a standardised test developer for NZCER (1997-2000) and Auckland UniServices. he was the Senior Project Manager for the Assessment

Tools for Teaching and Learning (asTTle) project (2000-2005). After completing teacher training in Montreal Canada (1979-1981), Gavin

worked in NZ for 13 years (1983-1996) as a tutor of ESOL and as a high school teacher of English and ESOL.

He has contributed to Doctoral Dissertasions, master’s theses, and honor’s project ata UoA, Universidad Federale de Minas Gerais, Universidad Federale de Ouro Preto, Ludwig Maximilian University, National Institute of Education Singapore,

and the Education University of Hong Kong.

RUNDOWN THE 6TH INTERNATIONAL

CONFERENCE ON SCIENCE, TECHNOLOGY AND

INTERDISCIPLINARY RESEARCH (IC - STAR) 2020

20TH OCTOBER 2020

TIME PROGRAM PIC

08.00 – 08.30 Registrastion Program Committee

08.30 – 08.35 Pray Mr. Zulmiftahul Huda

08.35 – 08.40 Opening Ceremony MC

08.40 – 08.50 National Anthem Ms. Trisya

08.50 – 09.10 Remarks and Report Dr. Khairudin

09.10 – 09.20 Welcoming Speech from

The Dean of Eng. Fac. Prof. Dr. Suharno

09.20 – 09.30 Welcoming Speech and

Opening Seminar

Prof. Dr. Karomani

(The Rector of Unila)

09.30 – 10.00 COFFEE BREAK

ON LINE PANEL PRESENTATION – Zoom Virtual Room

Moderator : Dr. Lukmanul Hakim and Dr. Ika Kustiani

10.00 – 10.20 Keynote Speaker 1 Prof. Ahmad Saudi S, Unila - Indonesia

10.20 – 10.40 Keynote Speaker 2 Prof. Rizal Mamat, UMP - Malaysia

10.40 – 11.00 Keynote Speaker 3 Prof. Sunny J.K, JEC - India

11.00 – 11.20 Keynote Speaker 4 Prof. N Kasai, YNU - Japan

11.20 – 11.40 Keynote Speaker 5 Prof. G. Brown, AU - New Zealand

11.40 – 12.00 Discussion Moderator

12.00 – 13.00 LUNCH BREAK

13.00 – 17.18 Paralel Session (Zoom Virtual Room)

17.18 - 17.30 Resume Statement and Closing of IC-STAR 2020

RUNDOWN PARALLEL SESSION (ZOOM VIRTUAL ROOM)

N0.

TIME

ROOM 1

Moderator :

Dr. Misfa

Susanto

ROOM 2

Moderator :

Dr. M. Irsyad

ROOM 3

Moderator :

Dr. Joni Agustian

ROOM 4

Moderator :

Dr. Herman H.

Sinaga

ROOM 5

Moderator :

Dr. Ageng

Sadnowo R.

ROOM 6

Moderator :

Dr. Nandi

Khairudin

PAPER ID

1 13.00 - 13.12 #1 #12 #3 #20 #9 #5

2 13.12 - 13.24 #2 #13 #7 #22 #11 #15

3 13.24 - 13.36 #4 #28 #16 #31 #21 #23

4 13.36 – 13.48 #6 #44 #17 #33 #26 #25

5 13.48 – 14.00 #18 #45 #24 #49 #38 #29

6 14.00 - 14.12 #19 #46 #27 #51 #39 #30

7 14.12 – 14.24 #34 #56 #36 #58 #43 #35

8 14.24 - 14.36 #40 #63 #42 #60 #48 #37

9 14.36 - 14.48 #62 #65 #47 #61 #52 #50

BREAK

10 15.30 - 15.42 #76 #66 #77 #64 #55 #53

11 15.42 - 15.54 #86 #70 #89 #68 #57 #59

12 15.54 - 16.06 #87 #78 #90 #69 #73 #72

13 16.06 - 16.18 #91 #88 #94 #71 #79 #74

14 16.18 - 16.30 #92 #97 #95 #75 #80 #100

15 16.30 - 16.42 #93 - - #83 #81 -

16 16.42 - 16.54 #96 - - #98 #82 -

17 16.54 – 17.06 - - - #99 #84 -

18 17.06 - 17.18 - - - #101 #85 -

PARALLEL SESSION ROOM 1

PAPER

ID# AUTHORS TITLE

1

Nathanael Joshua

Harjono, Alfa Satya

Putra, Andree E. Widjaja,

Kusno Prasetya and Aditya R.

Mitra

Automated Class Attendance Management System using

Face Recognition: An Application of Viola-Jones Method

2

Gede Indrawan, Ketut Udy

Ariawan, Ketut Agustini and I

Ketut Paramarta

Finite-State Machine for Post-Processing Method of

Balinese Script to Latin Transliteration

4 Ayu Sintianingrum, Khairudin

and Lukmanul Hakim

Optimization of Microgrid Battery Capacity using PSO with

Considering Islanding Operation

6

Hery Hery, Calandra A.

Haryani, Aditya R. Mitra and

Andree E. Widjaja

The design of microcontroller based early warning fire

detection system for home monitoring

18

Helmy Fitriawan, M. Arif

Septa Diandika, Syaiful Alam

and Sri Purwiyanti

Healthcare Monitoring using Android Application and

Internet of Things (IoT)

19 Ayubi Wirara and Muhammad

Salman

Analysis Forensics Instant Messaging Application

“WhatsApp” On iOS Smartphone

34

Robertus Zidan Hadi Suyoto,

Muhammad Komarudin, Gigih

Forda Nama and Titin Yulianti

Classification of Civet and Canephora Coffee using Support-

Vector Machines (SVM) Algorithm based on orde-1 Feature

Extraction

40

Ahmad Saudi Samosir and

Akhmad Riszal

Analysis of the Effect of Wind Speed Variation on the

Design of Horizontal Axis Wind Turbine with Qblade

Software

62

Yudi Eka Putra, Sri Ratna

Sulistiyanti and Ahmad Saudi

Samosir

Characteristics of Ultrasonic Velocity of Eggs Using HC-

SR04 Module

76

Lukmanul Hakim, Khairudin,

Umi Murdika, Zulmiftah Huda

and Herri Gusmedi

Performance Analysis of Newton-Raphson Power Flow

Computations Based on Power and Current Mismatches

86

Rizky Putra, Herman Sinaga,

Nining Purwasih, Diah

Permata, Yetti Yuniati and

Henry B.H. Sitorus

Partial Discharge Type Detection and Identification Based

on Its Sources

87

Herman Sinaga, Yetti Yuniati,

Nining Purwasih, Diah Permata

and Henry B.H. Sitorus

Partial Discharge Localization in Power Transformers Using

Fractal Hilbert Sensor

91

Novalio Daratha, Afriyastuti

Herawati, Muhammad Khairul

Amri Rosa, Ika Novia

Anggraini, Agus Nuramal,

Mukhlis Islam, Yudi Setiawan

and Sigit Sudjatmiko

Challenges in Operation and Maintenance of Low-Voltage

Networks Owned by A Medium-Voltage Customer in

Indonesia (Case Study: University of Bengkulu)

92

Tiya Muthia, Haedar Aziz

Mahmud, Fx Arinto Setyawan,

Sri Ratna Sulistiyanti and Sri

Purwiyanti

Realtime Obstacle Detection Based On Raspberry Pi 3 Using

Hough Transform Method

93

Ahmad Saudi Samosir, Fahrur

Riza Priyana and Dekpride

Despa

Design of Dynamic Evolution Control For Maximum Power

Point Tracking Techniques In Solar Photovoltaic Systems.

96

Annisa Bella Triani, Setiyo

Budiyanto, Andi Adriansyah

and Mudrik Alaydrus

Optimization Of X-Ray Parameter Monitor Wireless System

Based On Internet Of Things

PARALLEL SESSION ROOM 2

PAPER

ID# AUTHORS TITLE

12

Sirojuddin Sirojuddin,

Mohamad Husni Fajar, Aam

Amaningsih Jumhur and

Ahmad Kholil

Design of an Efficient Car by Biomimicry of a Pomfret

Fish Body

13

Sirojuddin Sirojuddin, Yuga

Fitri Nur Syamsy, Mohamad

Husni Fajar and Muhammad

Abdurrahman Ihsan

Effects of Roof Box on the Cars Against the Fuel

Consumption

28

Hakun Wirawasista

Aparamarta, Setiyo Gunawan,

Aang Firmansyah Mochtar and

M. Yusril Izhar Noer

Study of Optimization and Kinetic Modelling of Biodiesel

Production from Nyamplung Oil With Microwave Assisted

Extraction (MAE) Method Using Response Surface

Methodology (RSM)

44

Sirojuddin Abbas, Baskoro

Cahhyo Heri Nugroho, Ilham

Ekayana, Haritsa Rachma Aziz

and Sorimuda Harahap

Design Optimization of Guide Vane Geometry of Kaplan

Turbine

45

Sirojuddin Abbas, Haritsa

Rachma Aziz, Baskoro

Cahhyo Heri Nugroho, Ilham

Ekayana, Sorimuda Harahap

and Aam Amaningsih Jumhur

Investigation of The Runner Blades Arrangement with

Gap, without Gap, and Overlap Geometry against The

Power Generated by The Kaplan Turbine

46

Sirojuddin Abbas, Ilham

Ekayana, Baskoro Cahhyo

Heri Nugroho, Haritsa Rachma

Aziz, Sorimuda Harahap and

Ahmad Kholil

Investigation of Conical Draft Tube of Kaplan Turbine

with Spiral Liner and without Spiral Liner using CFD

Simulation

56 Hartomo Soewardi and

Khoirul Anwar Hasibuan

Investigation of muscle contraction on motorcycle

handlebar using electromyography

63

Sirojuddin Sirojuddin, William

Muhamad Rosadi and

Syamsuir Syamsuir

DESIGN OPTIMATION OF SHAFTS FOR SHREDDER

MACHINE WITH 25 LITRES CAPACITY

65

Sirojuddin Sirojuddin,

Muhammad Ridwan Ali

Setiawan and Syamsuir

Syamsuir

BLADE DESIGN OF SHREDDER MACHINE WITH 25

LITRES CAPACITY FOR PLASTIC WASTE

66

Sirojuddin Sirojuddin, Ghifary

Adam Fairuzy and Syamsuir

Syamsuir

CASING DESIGN OF SHREDDER MACHINE WITH 25

LITRES CAPACITY FOR PLASTIC BOTTLE WASTE

70

Sirojuddin

Sirojuddin, Muhammad

Haris, Indra Rizky

Ramadhan, Haryo

Suharjo, Aam Amaningsih

Jumhur and Ahmad Kholil

High Performance Scale Model for a Wind Turbine with

Deflector Knockdown System

78

Rinda Oktia Cahyaningsih and

Adithya Sudiarno

Comparison Study Of Cross – Organizational Cultural

Between Public University Institution and State-Owned

Company in Indonesia

88

Siti Nur Kayatun, Hari

Purnomo, Fikrihadi Kurnia

and Masniar

Identification of Musculoskeletal Complaints on Noken

Papua Craftsmen

97 Yeni Sumantri Logistics Service Process and Attribute in Container

Shipping Companies

PARALLEL SESSION ROOM 3

PAPER

ID# AUTHORS TITLE

3 Hendri Hendri and Roswati

Nurhasanah

Characteristics of medium-low rank coal blending on

performance and efficiency steam power plant

7

Setyo Hariyadi Suranto Putro,

Sutardi Sutardi, Wawan Aries

Widodo, Bambang Juni Pitoyo

and Nyaris Pambudiyatno

Comparison of The Winglet Aerodynamic Performance in

Unmanned Aerial Vehicle at Low Reynolds Number

16

Rita Normalia and Dewi

Amalia

Integrated Management Systems : The Integration of

ISO/IEC 17020, ISO/IEC 17021, ISO/IEC 17025 and

ISO/IEC 17065 Based on PAS 99 Specification

17

Ferry Desromi, Yuliantini Eka

Putri, Yuli Ermawati and Joko

Kuswanto

The Evaluation Of The Main Pipes and Capacity For The

Waste Water At Pt Plantation Mitra Ogan

24 Sutardi Sutardi and Rasyid

Ridha

The Effect of Swept Angle on the Flow Structures and

Aerodynamic Performances of Airfoil NACA 0012

27

Agung Sutrisno, Vikas Kumar,

Shinta Virdhian, Dwi

Handayani and Charles

Punuhsingon

Supply Chain Sustainability Risk Management Tools - A

Classification Scheme

36

Mohammad Badaruddin, Budi

Prasetyo, Bma Bakti and

Sugiyanto Sugiyanto

Effect of austempering temperature on impact toughness

properties of AISI 4140 steel

42

Rustan Tarakka, Nasaruddin

Salam, Jalaluddin, Wawan

Rauf and Muhammad Ihsan

Aerodynamic drag reduction on the application of suction

flow control on vehicle model with varied upstream velocity

47

Nasaruddin Salam, Rustan

Tarakka, Jalaluddin,

Muhammad Ihsan and Muh.

Annur Jimran

Flow drag across three minibus car models arranged in

tandem in four configurations

77 Fahrizal Akbar and Ridho

Hantoro

DESIGN AND EXPERIMENT VORTEX GRAVITATION

TURBINE MODEL LABORATORY SCALE

89

Dedi Suryadi, Andhika

Pratama, Argian Ardi Prasetya,

Novalio Daratha and Indra

Agustian

Analysis of Optimum Tuned Mass Damper to Reduce

Vibration Response by Using Genetic Algorithm

90

Amrizal Amrizal, Yandi

Permana H and Muhammad

Irsyad

Comparative study of single and double pass solar PV/T air

collectors integrated with rectangular plate fin absorber

94 Nyoman Sugiartha The Proof-of-Concept of Green Cooling Production with a

Solar-Assisted Adsorption Cycle Prototype

95 Ramesh Deshmukh and Tushar

Badgujar

Vibration Analysis of Composite Internal Door Panel of a

Car using FFT Analyzer

PARALLEL SESSION ROOM 4

PAPER

ID# AUTHORS TITLE

20

Gema Fitriyano, Nurul Hidayati

Fithriyah, Ratri Ariatmi

Nugrahani, Syamsudin Ab and

Muhammad Kosasih

Optimization, Modelling, and Simulation to Scale-up the

Production of Rice Bran Extract and Defatted Rice Bran

22

Dinan Andiwijayakusuma,

Alim Mardhi, Topan

Setiadipura, Acep Purqon and

Zaki Su'Ud

Vulnerability assessment for physical protection system of a

nuclear facility using multi-path adversary analysis code

31

Nirwan Syarif, Muhammad

Prof. Dr. Muhammad Nurdin.

M.Si and Wulandari Sudarsono

TIME-DEPENDENT DENSITY FUNCTIONAL

THEORY WITH SPIN-ORBIT COUPLING

CALCULATION FOR PREDICTING PHOTONIC

CHARACTER OF RUTHENIUM - CARBON NITRIDE

COMPLEX

33

Shinta Virdhian, Deni

Cahyadi, Muhammad

Fathurrohman, Evi

Oktavia and Arief Rahman

Implementation of Reverse Engineering Method for Disc

Refiner Development

49 Fadil Almer M Jhoni and Yano

Surya Pradana

Conversion of Microalgae Nannochloropsis sp. into Bio-

crude Oil using Low-temperature Hydrothermal

Liquefaction

51 Edo Rantou Wijaya and Titania application of the EPQ method to minimize the total cost of

inventory of refined sugar products at PT. X

58

Irvi Nurul Jannah Siahaan,

Andreas Exa Saputra and Eva

Fathul Karamah

The Effects of Ozonation and Ultrasonic Cavitation on Batik

Wastewater Treatment with Coagulation-Flocculation as

Pretreatment

60

Aziza Nurul Fitri, Devita

Amelia and Eva Fathul

Karamah

The Effect of Ozonation on the Chemical Structure of

Microplastics

61

Andreas Exa Saputra, Irvi

Nurul Jannah Siahaan and Eva

Fathul Karamah

Batik Wastewater Treatment by the Hydrodynamic

Cavitation and Ozonation with Coagulation-Flocculation

Pretreatment

64

Yuliusman and Raisa Aulia

Hanifah

Production and Characterization of NiO Modified-Activated

Carbon from Palm Shell Waste by Chemical Activation with

K2CO3 and Physical Activation

68

Yano Surya Pradana, Brilian

Ryan Sadewo and Laras

Prasakti

Microalgal biodiesel as an alternative fuel: Technological

study of conversion process in Indonesia

69

Yuliusman and Tetra Mutiara

Afifah

Production of Palm shell Based Activated Carbon by Two

Stage Phosphoric Acid Impregnation and Physical

Activation

71

Praswasti Pembangun Dyah

Kencana Wulan, Yogi Yolanda

and Umar Putra Syahrudin

The Effect of Carbon Nanotube Addition and Empty Palm

Oil Fruit Bunch Fiber Form Variation on Mechanical

Properties of Epoxy Composite

75

Rizka Utami, Dwi

Gustiono and Mochammad

Dachyar Effendi

Synthesis and Characterization of Hydroxyapatite

Bioceramics From Serai Snail Shells and Mangrove Crab

Shells in West Tanjung Jabung Beach: Effect of Milling

Process

83

Lutfi Aditya, Sri Juari Santosa

and Bambang Rusdiarso

Comparison Study of PHBA-intercalated Mg/Al-LDH and

PHBA-immobilized Mg/Al-LDH: Characterization and

Application for [AuCl4]̄ Removal from Solution

98 Bauyrzhan Rakhadilov,

Zhuldyz Sagdoldina, Rauan

Obtaining functional gradient coatings based on Al2O3 by

detonation spraying

Kozhanova, Dautbaev and

Meruyert Maulet

99

Titik Sundari and Abdul Wahid

Concentration profile and water level effect to the

evaporation using a diffusion approach in spent nuclear fuel

storage pool

101

Naftalia Ariska M Bangun and

Elida Purba

The effect of the nutritional of TEM (Tauge Extract Media)

and Conwy on increase protein and carbohydrate in

microalgaes Tetraselmis chuii contents

PARALLEL SESSION ROOM 5

PAPER

ID# AUTHORS TITLE

9 Cahya Damayanti Morphological Identification of Bedrock Using Microtremor

Data

11

Rahmat Catur Wibowo, Bagus

Sapto Mulyanto, Ordas

Dewanto and Muh Sarkowi

Structure from Motion (SfM) to Characterize Fluvial

Sedimentology: Case Study Way Semaka River

21

Akhmad Syaiful Arief, Tony

Dwi Susanto and Idaa

Warmadewanthi

Development methodology smart environment assessment

indicators: A Systematic Literature Review

26 Siti Mayuni, Sri Prabandiyani

and Bagus Hario Setiadji

Performance of OGFC using West Kalimantan Aggregates

and Polymer Modified Bitumen

38

Rustadi, Agus Setiawan, I

Gede Boy Darmawan, Nandi

Haerudin and Suharno

Geophysical Approach for Assessment of Seawater

Intrusion in the Coastal Aquifer of Bandar Lampung,

Indonesia

39

Ordas Dewanto, Ditha

Arlinsky Ar. and Rahmat Catur

Wibowo

Reservoir Properties Prediction Using Seismic Inversion and

Geostatistical Integration

43

Sandri Erfani, Frischiella

Mustika Sari Siregar, Ahmad

Zaenudin, Rustadi, Ida Bagus

Suananda Yogi and Rahmat

Catur Wibowo

Coal Velocity and Proximate Analysis Relationship Using

Multiple Linear Regression

48 Bimo Aji Widyantoro and

Purnama Budi Santosa

Geospatial analysis of optimal routing for fire disaster

mitigation in Makassar city

52

Bagus Sapto Mulyanto, Fristi

Shabrina Parameswari, Ordas

Dewanto and Rahmat Catur

Wibowo

Reservoir Properties Modeling Using Multi-Attribute

Seismic Analysis: Case Study South Sumatra Basin

55 Shofwatul Fadilah, Istiarto and

Djoko Legono

Investigation and modelling of flood control system in the

Aerotropolis of Yogyakarta Interational Airport

57

Karyanto, Nandi Haerudin,

Suharno, I Gede Boy

Darmawan, Muhammad Adli

and Posman Manurung

Numerical modelling for steady state condition of

geothermal system in Way Ratai

73 Samsunan and Inseun Yuri

Salena

Influence of groundnut shell ash on compressive and tensile

strengths of concrete

79

Isnaini Rosyida, Sugiyanto

Sugiyanto, Tsn Asih and Sb

Waluya

An Application of Fuzzy Shortest Path for Designing Public

Transportation Route (A Case Study in Yogyakarta,

Indonesia)

80

Isnaini Rosyida, Nurhaida

Nurhaida and Alfa Narendra

A Combination Among Fuzzy Graph, Fuzzy Chromatic

Number, and Fuzzy Inference System for Traffic Light

Assignment

81

Hayuning Anggrahita,

Guswandi, Fedo Syahputra

Lubis, Ravidania Auni and

Maria Hedwig Dewi Susilowati

Evaluation of Space Utilization in Vertical Residential

Complex in Jakarta

82

Gabriel N. Legaspi Legaspi,

Roy Laqui, Michael Julian

Meris and Dante Silva

A Case Study Analysis on the Role of Value Management in

the Construction Industry and the Philippines in Managing

the Design

84

Crissandra Nicole Cruz, Rey

Tumbokon and Jannuz Reyes

COMPARATIVE ANALYSIS OF COMPRESSIVE

STRENGTH OF OYSTER SHELL USED AS PARTIAL

SUBSTITUTE FOR FINE AGGREGATE AND FOR

CEMENT IN CONCRETE

85 Gusta Gunawan Hydrological modelling of Air Bengkulu watershed,

Indonesia, by HSS and HEC-HMS model

PARALLEL SESSION ROOM 6

PAPER

ID# AUTHORS TITLE

5

Chalida Syari, Hartoyo and

Indra Gumay Febryano

Descriptive study of community empowerment programs

in coastal village business enterprises (BUM Desa) Teluk

Pandan and Padang Cermin Sub-district, Pesawaran

district

15 Mariska Pitoi Low volume extraction of pyrethroid analysis in fresh tea

leaves: method validation

23

Saiful Hikam, Paul Benyamin

Timotiwu, Deny Sudrajat and

Sinta Alvianti

THE APPLICATION OF TUKEY’S MEAN

DIFFERENCE AND DENDROGRAM STATISTICS

TO IDENTIFY LOCAL GENETIC SOURCES OF

CORN IN SELECTING FOR PROSPECTIVE

PARENTAL LINES

25

Akhdi Permana, Diana Sofia

Hanafiah and Hasanuddin

Performance, Genetic Variability, Heritability, and

Genetic Advance of Maize Hybrids Resistance to

Northern Corn Leaf Blight and Yield Components in

Karo Highland

29

Raden Putra, Tastaptyani

Kurnia Nufutomo, Yuni

Lisafitri, Novi Kartika Sari and

Alfian Zurfi

South Sumatra Peat Fires Analysis in 2019 using Spatial

Approach

30

Novi Kartika Sari, Tastaptyani

Kurnia Nufutomo, Yuni

Lisafitri, Alfian Zurfi and

Raden Putra

Identifying Association between Fire Hotspot

Distribution and PM10 during 2019 wildlife period in

South Sumatera, Indonesia

35 Sugeng P Harianto, Bainah

Sari Dewi and Afif Bintoro

The Dynamics of the Repong Damar Vegetation in Krui

Pesisir Barat

37

Agung Nugroho, Bowo

Cahyono, Ayu Ismahu and

Pratidina Putri

Pattern of Batik Kawung and Parang Rusak Identification

Based on First Order Statistical Feature Extraction

Method

50

Misto, Kamilah Alawiyah,

Novia Puji Lestari, Lutfi

Rohman, Supriyadi,

Mutmainnah and Endhah

Purwandari

Spectrophotometric Analysis of Caffeine in Local

Product of Arabica: Observed at Different Roasted

Temperatures

53

Radho Al Kausar, Buhani,

Suharso and Andi Setiawan

Synthesis and Characterization Exopolysaccharide from

Spirulina sp. Algae using Sol-Gel Technique as

Absorbent Pb(II) Ion Metal

59

Hayuning Anggrahita,

Guswandi, Ravidania Auni and

Fedo Syahputra Lubis

The Potential of Urban Agriculture for Greening Grey

Infrastructure: The Case of Simple, Low Cost Apartment

Buildings in Jakarta

72

Dewi Ulul Azmi

WATER ABSORPTION, DENSITY, STRENGTH

STRENGTH, AND ELASTICITY MODULE OF

GREEN COMPOSITE MATERIAL BASED ON

WASTE PAPER WASTE AND MATRIX OF GARUT

UMBI STATES (Maranta Arundinaceae L.): EFFECT

OF FORMING TEMPERATURE WASTE

74

Dwi Gustiono, Nendar

Herdianto and Mochammad

Dachyar Effendi

Development of Local Bioceramic Scaffolds for Bone

Tissue Applications

100

Novi Kartika Sari, Raden Putra,

Tastaptyani Kurnia Nufutomo,

Yuni Lisafitri and Alfian Zurfi

Identifying Association between Fire Hotspot

Distribution and PM10 during 2019 wildlife period in

The South Sumatera, Indonesia

Automated Class Attendance Management System using Face

Recognition: An Application of Viola-Jones Method

N J Harjono, A S Putra, A E Widjaja*, K Prasetya, and A R Mitra

Department of Information System, Universitas Pelita Harapan, Tangerang

*E-mail: andree.widjaja@uph.edu

Abstract. Over the past few years, face recognition has been widely used to help human activities

in various sectors, including the education sector. By using facial recognition, the class

attendance system at universities can be significantly improved. For example, students are no

longer asked to sign attendance sheets manually, but attendance can be taken, recorded, and

managed automatically through an integrated class attendance management system using facial

recognition. The recorded data can then be further analysed to produce useful information for

instructors and administrators. In turn, this arrangement will assist them in making decisions

about matters relating to student attendance. The main objective of this research is to develop an

automatic class attendance management system using facial recognition. In particular, the system

we propose is developed using a prototyping software development approach and is modelled

using UML version 2.0 (use cases, classes and activity diagrams). As a choice of methods and

tools, we use the Viola-Jones method as a face detection algorithm, Python and PHP as

programming languages, OpenCV as the computer vision library, and MySQL as the DBMS.

The results obtained from a number of blackbox tests carried out were a fully functional

automatic class attendance system prototype using facial recognition.

Keywords: Face recognition, class attendance management system, Viola-Jones method,

Python, Open CV

Finite-State Machine for Post-Processing Method of Balinese

Script to Latin Transliteration

G Indrawan1,*, K U Ariawan1, K Agustini1, and I K Paramarta2

1 Department of Electrical Engineering and Computer Science, Universitas Pendidikan

Ganesha, Main Campus Jalan Udayana No. 11 Singaraja 81116, Bali, Indonesia

2 Department of Balinese Language Education, Universitas Pendidikan Ganesha,

Lower Campus Jalan Ahmad Yani No. 67 Singaraja 81116, Bali, Indonesia

*Email: gindrawan@undiksha.ac.id

Abstract. The decreasing use of Balinese Script, including its Balinese Script to Latin

transliteration knowledge, has caused concern over the threat of the extinction. This research

joined the preservation effort through collaboration between Engineering and Language

discipline. This research focused on the development of modular post-processing method of that

transliteration by using Finite-State-Machine (FSM). This method can be used on mobile

application for ubiquitous learning and handles the transliteration process from Unicode Balinese

Script text to Latin text. It receives the output from preceding conversion process from Balinese

Script image to Unicode Balinese Script text. This method was combined with dictionary data

structure for the advantage on time complexity O(1) and avoiding hard-coded transliteration rule.

This research contributed onthat development since there has been no such development in this

research area. The FSM was represented by a state-transition table showing six possible states,

transitions between them (based upon twenty inputs), and the outputs. The dictionary consists of

9620 key-value pairs that comply with the transliteration rule. Through the experiment, this

method has passed over 99% (251 of 253) testing cases based on intermediate and output results

of selected image data set that consists of various possible kind of post-processing cases.

Keywords: Balinese Script, finite-state machine, Latin, post-processing, transliteration

Characteristics of medium-low rank coal blending on

performance and efficiency steam power plant

Hendri1, Roswati Nurhasanah2 dan Ahmad Fathoni Lubis3

1,2,3 Program Study of Mechanical Engineering of Faculty Technology and Energy

Business, PLN Institute of Technology

*Email: hendri@itpln.ac.id

Abstract. Blending medium rank coal (MRC) with low rank coal (LRC) is carried out to meet

the caloric content with follows the boiler specifications. Negative effects of blending with LRC

are environmental, Specific fuel consumption (SFC) and efficiency issues. This research

simulates coal blending with MRC percentage in the MRC-LRC from 0, 20%, 40%, 50%, 60%,

80% and 100%. The type coal used are categorized in MRC1, MRC2, LRC1, LRC2, LRC3.

Combination used is MRC1-LRC1, MRC1-LRC2 and MRC2-LRC3. From the analysis obtained,

if the MRC percentage in MRC-LRC blending increase, losses will decrease mass flow will

decrease, SFC will decrease, and boiler efficiency will increase. Blending MRC2-LRC3 has the

lowest losses, low mass flow with average of 298,78 ton/h, low SFC with average of 0,466

kg/kWh, and boiler efficiency between 84.85% to 85,71 %. Blending MRC2-LRC3 is most

recommended for use in combustion plant with minimum MRC2 percentage of 50%.

Keywords: coal blending, Medium rank coal, low rank coal, boiler efficiency

Optimization of Microgrid Battery Capacity using PSO with

Considering Islanding Operation

Ayu Sintianingrum1*, Khairudin1, Lukmanul Hakim1

1 Department of Electrical Engineering, Universitas Lampung, Jalan Prof. Soemantri

Brojonegoro No.1, Bandar Lampung 35145, Indonesia

*Email: ayusintianingrum@gmail.com

Abstract. Electrical is used for various activities in all sectors. Rapid increase of electricity

demand recently, makes it necessary to have an even more efficient method for generating

electricity. Renewable energy and the microgrid provides an integrated and alternative solution

for electricity generation. In Microgrid sytems, energy storage devices are one of important

aspect. Batteries are one kind of the energy storage technologies widely used in power system

and hence, their suitable capacity must be determined in order to develop an effective system

installation. In this research, sizing optimization of battery capacity is modeled as a minimization

of microgrid battery capacity using the Particle Swarm Optimization / PSO algorithm with

considering islanding operation of the system for effective battery installation. Results show that

optimal battery capacity can be obtained and the developed computational model gives

satisfactory results for the system under study.

Keywords: Battery, microgrid, energy storage system, PSO algorithm

Descriptive study of community development program in

coastal village business enterprises (BUM Desa) Teluk Pandan

and Padang Cermin sub-district, Pesawaran district

C Syari1,*, Hartoyo2, and I G Febryano3

1 Management of Coastal and Marine Areas – Graduate Program, Universitas

Lampung, Jl. Prof. Dr. Sumantri Brojonegoro No.1, Bandar Lampung 35145,

Indonesia

2 Department of Sociology, Universitas Lampung, Jl. Prof. Soemantri Brojonegoro

No.1, Bandar Lampung 35145, Indonesia

2 Department of Forestry, Universitas Lampung, Jl. Prof. Soemantri Brojonegoro

No.1, Bandar Lampung 35145, Indonesia

*Email: chalidanurali@gmail.com

Abstract. Coastal communities in rural areas are still in a marginal position. One effort to make

them become independent is the establishment of a strong institution in the village, one of them

is through BUM Desa by using mangroves as one of the village's assets. BUM Desa has a basis

for full participatory and emancipatory formation of village communities. This research aims to

describe the development efforts carried out to the community, analyze what supports and

inhibits community involvement in community development activities, and formulates a model

of community development that is appropriate to the socio-cultural culture of the local

community. This research was conducted in Gebang Village and Durian Village, Pesawaran

Regency with a focus on BUM Mangrove tourism village. This study uses qualitative methods

obtained through documentation studies and indepth interview. Community development efforts

in both villages involved many stakeholders. Factors supporting community development

include the spirit of building on the community. The inhibiting factors are the communication

that exists between the village government and the community is still not optimal and the

development pattern that is still top down does not involve the community fully from each

development process. The effective development model used in Gebang Village is participatory

and Durian Village is combination of bottom up model and community-based.

Keywords: BUM Desa, community development, development model

The design of microcontroller based early warning fire

detection system for home monitoring

Hery*, C A Haryani, A R Mitra, and A E Widjaja

Department of Information System, Universitas Pelita Harapan, Tangerang

*E-mail: hery.fik@uph.edu

Abstract. Fire is a type of disaster that can occur anytime and anywhere as a result of any

accidental or intentional causes. Without exception, houses are also very vulnerable to fire. To

anticipate the catastrophic effects of fire that can destroy houses, advanced technology, such as

the Internet of Things (IoT) can be utilized to detect the smoke and fire. This study aims to design

an early warning fire detection system for home monitoring using smoke detection sensors based

on Arduino microcontroller together with NodeMCU ESP8266. This early warning fire detection

system is expected to function by notifying homeowners when detecting the presence of smoke

in their homes. With the aid of this detection system, the issue of potential damage, death, or

material loss caused by fire can be significantly reduced. The results and testing of the designed

system will be discussed in the paper.

Keywords: Early warning fire detection system, home monitoring, Arduino, NodeMCU

ESP8266

Comparison of the Winglet Aerodynamic Performance in

Unmanned Aerial Vehicle at Low Reynolds Number

Setyo Hariyadi S.P.1*, Bambang Juni Pitoyo1, Nyaris Pambudiyatno1, Sutardi2,

and Wawan Aries Widodo2

1 Department of Aircraft Engineering, Politeknik Penerbangan Surabaya, Jemur

Andayani I/73 Wonocolo, Surabaya, 60236, Indonesia

2 Department of Mechanical Engineering Faculty of Industrial Technology, Institut

Teknologi Sepuluh Nopember Surabaya, Jalan Arief Rahman Hakim, Surabaya

60111 Indonesia

* Email: hudzaifahsetyo@gmail.com

Abstract. The Aerodynamic performance of an object is very dependent on the flow of fluid

through it and the geometric shape of the object. The use of Unmanned Aerial Vehicle (UAV)

demands high aerodynamic performance because it strongly supports the cruising range and fuel

/ battery used. By reducing drag and increasing the lift optimally, the resulting lift to drag ratio

will get maximum results. This study compares the use of winglets in UAVs at low Reynolds

numbers. This is very important because generally UAVs are used at low Reynolds numbers.

The freestream used is Re = 2.34 x 104 on several low to high angle of attack. The type of airfoil

used is Eppler 562 which is equipped with a winglet. Winglets used are simple winglets, blended

winglets, and wingtip fence. The geometry was analyzed using numerical simulations namely

computational fluid dynamic (CFD). The turbulent model used in this study is K-ω SST on Ansys

19.1. From this study it was found that the use of a wingtip fence produced the best aerodynamic

performance compared to other configurations. In addition, the use of a wingtip fence can delay

stall and separation better than simple and blended winglets.

Keywords: lift to drag ratio, unmanned aerial vehicle, blended winglet, simple winglet, wingtip

fence

Morphological Identification of Bedrock Using Microtremor

Data

Cahya Damayanti 1

1 Center for Deep Sea Research, Indonesian Institute of Sciences. Ambon, Indonesia

cahy009@lipi.go.id

Abstract. Has been conducted to identify the morphology of bedrock in the city of Solok. This

research method uses analysis of microtremor data processed by the HVSR andmethods Spacial

Autocorrelation (SPAC). The bedrock morphology in the study area can be determined by

subtracting the surface height at the measurement point with the thickness of the sediment layer.

The value obtained is then interpolated to get a bedrock morphological picture. From the 3D map

of bedrock morphology the research area shows that the western research area precisely in Tanah

Garam village has the highest bedrock morphology, as well as several villages in Tanjung

Harapan sub-districts such as Laing, Nan Balimo and Kampung Jawa. Meanwhile, the central

area of Kota Solok is the area with the lowest bedrock morphology. The city of Solok is in a

basin that is bounded by two boundary planes that extend from the southeast to northwest of the

city of Solok. The two boundary planes are estimated as a fault line between an ascending block

and a descending block.

Keywords: Microtremor, bedrock, HVSR

Structure from Motion (SfM) to Characterize Fluvial

Sedimentology: Case Study Way Semaka River

R C Wibowo1,*, B S Mulyatno1, O Dewanto1 and M Sarkowi1

1 Department of Geophysical Engineering, Universitas Lampung, Jalan Prof.

Soemantri Brojonegoro No.1, Bandar Lampung 35145, Indonesia

*Email: rahmat.caturwibowo@eng.unila.ac.id

Abstract. Structure from motion (SfM) has seen rapid uptake recently in the fluvial

sedimentology. This uptake is not least due to the widespread availability of cheap unmanned

aerial vehicles/drones, which help mitigate the challenging terrain and deliver efficient and

reproducible and high-accuracy images and topographical data. The current study describes the

application of SfM in order to build a geomorphological model and estimates surface water

velocity of Way Semaka River in BNS region, West Lampung. Way Semaka river is river type

with a large meandering system and stable extension tectonic regime, relatively. River

morphology approximately 96.62 m width and 4 m depth in straight (relatively) area, whereas in

channel area approximately 171.22 m width and 5 m depth. The velocity range between 0.39 –

1.56 m/s based on image analysis and proven by current meter measurements onsite with an RMS

error 0.25. Manual geomorphic unit level 2 analysis revealed that for the zone within the channel,

9% of the coverage consisted of basins, 35% of the coverage consisted of convexity, 9%

consisted of planar features and 37% of the coverage consisted of the transition zone.

Keywords: SfM, sedimentology, fluvial, Way Semaka, BNS

Design of an Efficient Car by Biomimicry of a Pomfret Fish

Body

Sirojuddin1* , M H Fajar1 , A A Jumhur1 and A Kholil1

1 Department of Mechanical Engineering, State University of Jakarta, Jalan

Rawamangun Muka, Jakarta 13220, Indonesia

*Email: sirojuddin@unj.ac.id

Abstract. Pomfret fish naturally has a good aerodynamic body shape for traveling in the water

using less energy. Because of the streamline features of the pomfret fish, it generates less drag to its

movement. So, there are many variations of car designs by implementing the aerodynamic styles on the car

body to improving the efficiency of energy. This research aims to find out the model of a car body

that correlated to a pomfret fish by computational fluid dynamics (CFD) flow simulation

methods. The car body shape geometry will be made in 3D software, while flow simulation using

CFD. Based on CFD simulation results, it was found that the drag coefficient of the car body

with two passengers was 0.2 and with 4 passengers 0.26. From this result, the body of this car

can be adjusted to produce low drag and an efficient car.

Keywords: Biomimicry, CFD, drag coefficient, efficient car, pomfret fish

Effects of Roof Box on the Cars Against the Fuel

Consumption

Sirojuddin1*, Y F N Syamsy1, M H Fajar1 and M A Ihsan1

1 Department of Mechanical Engineering, State University of Jakarta, Jalan

Rawamangun Muka, Jakarta 13220, Indonesia

*Email: sirojuddin@unj.ac.id

Abstract. Roof box is usually used on the top of cars for long journey or go to down town so

that baggages are not placed inside the car. The effect of roof box will increase the value of drag

coefficient and drag force so that the fuel consumption also will increase. The aims of this

research was to give estimated value of the fuel consumption used by cars when without a roof

box and with a roof box condition. The 2D geometry of cars were drawn based on factory

specification, while 3D geometry processed by SolidWorks. Drag coefficient value analyzed by

SolidWork flow simulation software. It was found that the fuel consumption will increase

proportional with drag coefficient and drag force due to a roof box usage.

Keywords: Drag coefficient, drag force, flow simulation, fuel consumption, roof box

Low volume extraction of pyrethroid analysis in fresh tea

leaves: method validation

M M Pitoi*

Research unit for clean technology, Indonesian Institute of Sciences, Jalan Cisitu

21/154 D, Bandung 40135, Indonesia

*Email: mariska.pitoi@gmail.com; mari023@lipi.go.id

Abstract.

Fresh leaves of Camelia sinensis, the centre of tea industry, are vulnerable to insects and

pesticides are normally applied in tea plantations to combat this issue. Since pyrethroids are

effective against wide range of insects, they are commonly used in tea plantation. Previously,

pyrethroids were known as “safe” pesticides and were used to replace the relatively toxic

organochlorins. However, recent studies have shown evidence of their toxicity.

Despite many reports on pyrethroids analysis in dried tea or infusion tea, both for black or green

tea, report on fresh leaves is limited. Moreover, analysis of pyrethroid in fresh leaves is mainly

utilized big amount of samples and or chemicals. In addition, since fresh leaves are the source of

dried tea, pyrethroids contamination of fresh leaves may lead to dried tea contamination and

consequently may become a channel to human exposure through tea consumption. Therefore, it

is important to monitor the pyrethroids residue in fresh leaves of tea.

This study aimed to build a simple method for pyrethroid analysis in fresh leaves of tea. A simple

sample preparation method based on green analytical chemistry was proposed for simultaneous

determination of five pyrethroids (lambda-cyhalothrin, permethrin, cypermethrin, fenvalerate,

and deltamethrin) in fresh leaves matrix. The method implemented low volume solid-liquid

extraction using acetonitrile followed by d-SPE clean-up before GC-ECD quantification.

A spike-experiment, where known quantity of pyrethroids were spiked to fresh tealeaves before

the extractions, was conducted for the method validation. A parallel no spike- experiment was

also conducted as a comparison to the spike-experiment. Each set of experiment was conducted

in triplicates.

The result showed that the proposed method was valid for pyrethroid determination in fresh

tealeaves in terms of linearity, recovery, precision, and limit of quantification (LoQ). The

linearity of the method was good, showed by correlation coefficients > 0.999 at up to 0.5 mg/L.

The recovery values are acceptable to European Commissions guideline (70-120%). The

precision values, calculated as % RSD (relative standard deviation), were all below 20%,

assuggested by European Commissions for pesticide residue analysis. The LoQs were calculated

based on signal to noise ratio and were all below the minimum residue limits. Since the method

was valid, it can be used to monitor the pyrethroids in fresh leaves of tea.

Keywords: pyrethroids, fresh tea leaf, low volume solid-liquid extraction, green analytical

chemistry

Integrated Management Systems : The Integration ofISO/IEC

17020, ISO/IEC 17021, ISO/IEC 17025 and ISO/IEC 17065

Based on PAS 99 Specification

R Normalia1, D Amalia2*

1,2 Metal Industry Development Center, Ministry of Industry, Jalan Sangkuriang No.12

Bandung 40135, Indonesia

*Email: rita.normalia@gmail.com

I

Abstract : The more management systems implemented, the more benefits the

organization will have. So that it will make more work to manage more than one system

at a time. The integrated management system allows us to streamline the way or method

of organization operates, aligning all the usual standard requirements and cutting audit

and administrative costs compared to when it runs independently. Therefore

implementation can have a major impact on how to manage organizations with many

standards. In accordance with its objectives, this research resulted in the formulation of

integration steps, and a management system design model that applies ISO/IEC 17020,

ISO / IEC 17021, ISO / IEC 17025 and ISO / IEC 17065 with reference to the PAS 99

standard. Implementation The design is implemented in Government Agencies that apply

many standards. Case studies are carried out by designing Integrated Quality Guidelines

and integrating internal audit, external audit and management review activities. The

results of this study are expected to be applied by companies and various industries that

adopt many standards simultaneously, so that implementation is more effective and

efficient.

Keywords: management systems, integrated, standards, effective

THE EVALUATION OF THE MAIN PIPES AND

CAPACITY FOR THE WASTE WATER AT PT

PLANTATION MITRA OGAN

Ferry Desromi1, Yuliantini Eka Putri2, Yuli Ermawati3, Joko Kuswanto4 1,2,3,4 Faculty of Engineering and Computers, University of Baturaja Jl. Ki Ratu Penghulu No. 02301, OKU, Sumatera Selatan, Indonesia

email: 1ferry_desromi@unbara.ac.id, 2yully_ubr@yahoo.co.id, 3yuli_ermawati@unbara.ac.id, 4jokokuswanto@unbara.ac.id

Abstract. In a sewerage treatment system a piping network is needed in order to channel wastewater

into the sewerage reservoir. With the location and condition of the research site, the placement of the

pipe and the diameter of the pipe must be adjusted so that it has an adequate flow rate and speed of

waste water. The purpose of this study is to determine the flow and discharge velocity in the main

pipe and determine the amount of capacity or volume of waste water reservoirs (IPLC) at PT

Plantation Mitra Ogan. The data collection method in this study uses a quantitative descriptive

analysis method by analyzing data obtained from various data collection or related agencies. The

results of the study were that the capacity of the IPLC sewerage at PT Plantation Mitra Ogan was

77,100 m3 with a drinking capacity of 675 m3 and a maximum of 18,000 m. Main Pipe Flow Speed

with a minimum value of 5.42605 m / sec and a maximum speed of 8.94643 m / sec. As well as the

discharge generated by the IPLC main pipe at PT Plantation Mitra Ogan with a drinking value of

0.01725 m3 / sec and a maximum value of 0.06996 m3 / sec.

Keywords: wastewater, WWTP, piping network, discharge, speed

Healthcare Monitoring using Android Application and Internet of

Things (IoT)

Helmi Fitriawan1, M. Arif Septa2, Syaiful Alam3, Sri Purwiyanti4

Email: 1 helmi.fitriawan@eng.unila.ac.id, 2 arif200996@gmail.com,

3syaiful.alam@eng.unila.ac.id, 4 sri.purwiyanti@eng.unila.ac.id

ABSTRACT : Health information systems are important application areas where Internet of Things

(IoT) can be used to provide more effective solutions. Currently, remote healthcare monitoring is

available via wireless communication based on IoT technology. This paper presents prototyping of

a wireless embedded healthcare monitoring based on IoT framework. By attaching some sensors to

the jacket worn by the patient, the physical condition of the patient can be monitored. The proposed

prototype system includes global positioning system (GPS) receiver, gyroscope, pulse, galvanic

skin response (GSR), and temperature sensors. In addition to detecting the fall condition and

location, the system is able to monitor the temperature, heart rate, and emotion of the patient. The

data measurement is processed by the Arduino Uno and send them to the android application using

global system for mobile communication (GSM) module. In order to guarantee all sensors perform

properly, sensor calibration is carried out by measuring the accuracy of the gyroscope, pulse, GSR,

and temperature sensors. The evaluation results show the prototype system works well in term of its

functionality.

Keyword : Internet of things, arduino uno, sensor, healthcare monitoring

Analysis Forensics Instant Messaging Application

“WhatsApp” On iOS Smartphone

Ayubi Wirara1, and Muhammad Salman1*

1 Department of Electrical Engineering, University of Indonesia, Indonesia

*Email: ayubi.wirara@ui.ac.id, muhammad.salman@ui.ac.id

Abstract. Based on APJII data released in 2018, it is known that most active internet users are

used to carry out message communication. The WhatsApp application is currently the primary

medium for exchanging messages and information in Indonesia. This is possible WhatsApp

application will be electronic evidence of a crimes. Data of WhatsApp conversation is very much

an obstacle for a forensic analyst in conducting analysis. In this research about analysis forensic

for WhatsApp application using flow process on NIST 800-101 which is a guide in handling

mobile forensics. The target of this research is smartphone device based on iOS so that resulted

can help an analyst forensics for analysist WhatsApp artifact form iOS platforms.

Keywords: Digital Forensics, WhatsApp, iOS

Optimization, Modelling, and Simulation to Scale-up the

Production of Rice Bran Extract and Defatted Rice Bran

Gema Fitriyano1,*, Nurul Hidayati Fithriyah2, Ratri Ariatmi Nugrahani2,

Syamsudin AB1, Muhammad Kosasih2

1Department of Chemical Engineering, Faculty of Engineering, Universitas

Muhammadiyah Jakarta, Indonesia

2Master in Chemical Engineering Programs, Faculty of Engineering, Universitas

Muhammadiyah Jakarta, Indonesia

*Email: gema.fitriyano@ftumj.ac.id

Abstract. Rice bran is the source of rice bran oil, but much of it is used as livestock feed without

being extracted for oil. Some food industries utilize the stabilized rice bran as a source of fiber,

protein, and cooking oil. It contains lipase that catalyzes triglyceride hydrolyzation into glycerol

and fatty acids, which leads to rancidity. A stabilization process must therefore be introduced to

increase oxidation resistance in rice bran and oil hydrolysis. Defatted rice bran still contains

protein, fiber, vitamins, and minerals. There has not been much research on integrated production

process of crude rice bran oil and defatted rice bran. This research aimed to study integrated

procedures to optimize, model, and simulate, generate Process Engineering Flow Diagram

(PEFD). The phases in this study included laboratory-scale extraction with rice bran feed

capacities of 10g, 25g, 100g, dan 500g; optimization using mathematical computations,

simulations of mass-balance scale up and generation of PEFD from the pilot plant of 5kg rice

bran capacity. The results showed that to increase production scale from an amount of raw

materials of 57.69g to 5kg in a single batch required 5kg rice bran and 23.121kg n-hexane and

produced 0.671kg oil and 4.121kg defatted rice bran, 13.212kg of reusable n- hexane.

Keywords: Flow Diagram, Optimization, Modelling, Rice bran, Simulation

Development Methodology Smart Environment Assessment

Indicators: A Systematic Literature Review

A S Arief1,a, T D Susanto1,b, and I Warmadewanthi2,c

1 Department of Information System, Sepuluh Nopember Institute of Technology,

Surabaya, Indonesia

2 Department of Environmental Engineering, Sepuluh Nopember Institute of

Technology, Surabaya, Indonesia

a are.yev007@gmail.com

b tonydwisusanto@is.its.ac.id

c warma@its.ac.id

Abstract. The trend of urbanization causes various impacts faced by a city, especially problems

that affect the environment such as increased emissions and air pollution, energy consumption,

waste, and other environmental damage. Urban areas contribute 70% of global CO2 emissions

today, therefore smart initiatives are needed to reduce the impact on the environment. The

concept of smart environment in smart cities is a step to reduce and solve environmental problems

in a city in an intelligent way. Smart city trends in Indonesia continue to increase, the Ministry

of Communication and Information (Ministry of Communication and Information) issued a smart

city model that is used on a national scale. This paper aims to answer how the Indonesian scale

model of smart environmental assessment indicators refers to the smart city model of the Ministry

of Communication and Information by conducting a systematic literature review. This research

provides information on the latest scientific research that focuses on indicators of intelligent

environmental assessment and provides valuable insights for future research.

Keywords: Smart City, Smart Environment, Assessment, Indicator.

The vulnerability assessment for physical protection system of

a nuclear facility using multi-path adversary analysis code

D Andiwijayakusuma1,3,*, A Mardhi1, T Setiadipura1, A Purqon2 and Z Su’ud3

1 Center for Nuclear Reactor Technology and Safety, Badan Tenaga Nuklir Nasional,

Gedung 80 Kawasan PUSPIPTEK Serpong, South Tangerang, Banten 15310,

Indonesia

2 Earth Physics and Complex System Research Division, Department of Physics,

Institut Teknologi Bandung Gedung Fisika, Jalan Ganesha 10, Bandung 40132,

Indonesia

2 Nuclear Physics and Bio Physics Research Division, Department of Physics, Institut

Teknologi Bandung Gedung Fisika, Jalan Ganesha 10, Bandung 40132, Indonesia

*Email: dandiwijaya@s.itb.ac.id / dinan@batan.go.id

Abstract. The Physical Protection System (PPS) plays an important role for each nuclear facility

to ensure the security of its nuclear material and facility from theft, sabotage, and other illegal

actions. The design of the PPS should limit the ability and strategy of the adversary to breach

nuclear facilities, therefore PPS vulnerability assessment is needed. The proposed vulnerable

assessment tool was implemented to a python computer code: Multi-path Analysis of

Vulnerability Assessment for PPS (MAVA). This code can perform the calculation of the

probability of interruption values simultaneously and multi-path analysis through an adversary

sequence diagram (ASD). We examined for feasibility by applying MAVA to a hypothetical

facility (National Nuclear Research Facility - NNRF) and predicts the vulnerable paths on various

adversary's strategies. The assessment results provide the vulnerability pathway information to

the analysts to improve the effectiveness of PPS.

Keywords: physical protection system, path analysis, nuclear security

THE APPLICATION OF TUKEY’S MEAN

DIFFERENCE AND DENDROGRAM STATISTICS TO

IDENTIFY LOCAL GENETIC SOURCES OF CORN IN

SELECTING FOR PROSPECTIVE PARENTAL LINES

Saiful Hikam(1)†, Paul B. Timotiwu(2), Deny Sudrajat(3), Sinta Alvianti(2)

ABSTRACT : Corn hybrid seeds of imported commercial became rather expensive for local

farmers due to exotic parental lines used in developing them. Extensive used of modern corn

hybrids since 1980 left numerous obsolete hybrid varieties scattered all over Indonesia. They were

once superior hybrids which became obsolete by the introduction of the new ones. Over time the

obsolete hybrids expressed superior traits toward detrimental hindrances in situ better than the

new hybrids such us resistance to pest and disease and drought, required significantly less

fertilizers while yielded at par with the new hybrids. The traits were identified, the obsolete

hybrids were worthy to select for being local genetic sources (LGS) in a corn breeding program.

The research was done to identify the LGS collected from Padang, Palembang, Jogjakarta, West

Kalimantan and Lampung. In 2018 the LGS were planted in two rows and let open-pollinated

among themselves and the seeds were harvested separately to make superior-female lines. A

synthetic line was made as a mixture of 100 seeds of each female line. In 2019 the six lines: five

female and one synthetic lines, and Pioneer36 (P36) F1-hybrid as control were planted in a

randomized complete block design with 3 replicates. The data were collected for traits: plant

height, leaf number plant-1, time to tasseling, time to silking, ear length, ear diameter, 100 seed

weight and seed yield m-2. The data were variance- analysed and Tukey’s mean difference was

applied to separate the means so the the lines could be grouped. A dendrogram was constructed

based on the distances among lines suitable to recombine. The result indicated that the Padang,

Palembang, Lampung and Synthetic lines could be used as the male parents to recombine with the

Jogjakarta and West Kalimantan lines.

Keywords: corn breeding, corn superior-female line, corn synthetic line, dendrogram, local

genetic source, Tukey’s mean difference

The Effect of Swept Angle on the Flow Structures and

Aerodynamic Performances of Airfoil NACA 0012

Sutardi1* and Rasyid Ridha2

1 Department of Mechanical Engineering Faculty of Industrial Technology and

System Engineering, Institut Teknologi Sepuluh Nopember Surabaya, Jalan Arief

Rahman Hakim, Surabaya 60111 Indonesia

2 Alumni of Mechanical Engineering Department, Institut Teknologi Sepuluh

Nopember, Surabaya

*Email: sutardi@me.its.ac.id

Abstract. Airfoil plays a significant role in aircraft aerodynamics. This airfoil provides the aircraft lift capability to overcome the aircraft weight and its total load. Many parameters affect the airfoil performances such as its sectional profile, swept angle, its arrangement, either low-

or high-arrangement, and angle of attack (). Other parameter such as the availability of winglet

also has significant effect on the airfoil performances. In this study, however, we are focusing on the evaluation of the effects of swept angle on the airfoil aerodynamic performances.

The study was performed numerically using a commercial software Ansys Fluent along with

Gambit. The specimen being studied is a symmetrical airfoil NACA 0012 serie. The airfoil chord

length and its aspect ratio is 100 mm and 5.0, respectively. Two values of angle of attack () are

used in this study, that are 8° and 15°, while the swept angles () have three variations of 0° (no

swept), 15°, and 30°. The simulation is run in the steady mode and the Reynolds number (Re) is

set to be 100,000, based on the airfoil chord length and the airflow freestream velocity. The k- SST turbulent model was employed in this simulation study. Main parameters to be studied include flow structures around the airfoil and the airfoil aerodynamic performances, such as lift,

drag, and lift to drag ratio.

The results of the study show that the swept angle () has significant influence on the vortex structures, both tip vortex and vortex at the wall-body junction. The streamline structures at the upper surface of the airfoil are also affected by the airfoil swept angle. The lift to drag ratio

(CL/CD) at = 8° is best suited with the 15° swept angle, while at = 15°, the airfoil is best

suited with the 30° swept angle.

Keywords: Swept Angle, Airfoil NACA 0012, Wall-Body Junction, Tip Vortex

Performance, Genetic Variability, Heritability, and Genetic

Advance of Maize Hybrids Resistance to Northern Corn Leaf Blight

and Yield Components in Karo Highland

Akhdi Permana1, Diana S. Hanafiah2, Hasanuddin3

Email: 1 akhdipermana@gmail.com, 2 dedek.hanafiah@yahoo.com, 3hasanuddiny@yahoo.com

ABSTRACT : Around two-thirds of corn area in North Sumatera are in high altitude places, where

northern corn leaf blight limits yield. Evaluation was performed to 125 new hybrids for their

resistance to northern corn leaf blight and yield components in Garingging, District of Karo, North

Sumatera, from October 2019 to March 2020. Experiments were arranged in Augmented RCBD

with 4 checks, Artificial inoculation was applied to ensure high and uniform disease pressure. Eight

new hybrids exceeded at least 3 checks regarding to disease resistance and ear weight, namely

N399, G163, N396, N374, D651, N020, D635, and N031. Hybrid N399 has ear weight above 4

checks and G163 has better AUDPC than the 4 checks, suggesting promising hybrids for

developing varieties in areas with NCLB pressure. Significant association with AUDPC was seen in

incubation period, ear diameter, ear length, and ear weight, suggesting improvement in NCLB

resistance leading to better yield. High to medium genotypic variability, heritability and genetic

advance was observed in incubation period, AUDPC, and ear weight, indicating the possibility of

further development by selection of the traits.

Keyword : AUDPC, genetic variance, genetic advance, heritability, NCLB

Performance of OGFC using West Kalimantan Aggregates and

Polymer Modified Bitumen

Siti Mayuni1, Sri Prabandiyani2, Bagus Hario Setiadji3

Email: 1 sitimayuni@students.undip.ac.id, 2 Wardani@live.undip.ac.id,

3bhsetiadji@ft.undip.ac.id

ABSTRACT : Open Graded Friction Course (OGFC) as a permeable pavement has been applied in

various developed and developing countries. As a safer road due to its decent roughness, OGFC

also functions as a drainage layer that could control hydroplaning conditions. In Indonesia, one type

of OGFC researched to date is porous asphalt. This mix has advantage in terms of its drainage

function, but it lacks of the ability to withstand against traffic load. The purpose of this study was to

evaluate the effect of binder content on the performance of porous asphalt mix in order to develop

porous asphalt pavements that meet structural and functional performance. Local aggregates from

the West Kalimantan region and PG-76 polymer modified bitumen were used with several binder

contents from 4% to 6%. Marshall test was performed to obtain the value of structural performance,

and permeability test with Falling Head Permeameter was performed to evaluate the functional

performance. The results of the study were the trend showing the effect of increasing binder content

to the stability and permeability values.

Keyword : porous asphalt, binder content, stability, permeability

Supply Chain Sustainability Risk Management Tools- A

Classification Scheme

Agung Sutrisno1*, Vikas Kumar2, Shinta Virdhian3, Dwi Handayani4 and Charles

Punuhsingon5

1 Department of Mechanical Engineering, Faculty of Engineering, Sam Ratulangi

University, Kampus Bahu, Manado 95115, Indonesia

2 Faculty of Business and Law, The University of The West of England, Frenchay

Campus, Bristol BS 161QY, United Kingdom.

3 Balai Besar Logam dan Mesin, Departemen Perindustrian, Republik Indonesia, Jl.

Sangkuriang No.12, Bandung 40135, Indonesia

4 Department of Industrial Engineering, Faculty of Engineering, Universitas Islam

Indonesia, Sleman 55584, Yogjakarta , Indonesia

5 Department of Mechanical Engineering, Faculty of Engineering, Sam Ratulangi

University, Kampus Bahu, Manado 95115, Indonesia

*Email: agungsutrisno@unsrat.ac.id

Abstract. In order to properly managing sustainability risk within supply chain context, the

existence of classification scheme of engineering tools dealing with sustainability risk

management is undeniably important. However, references which focused on effort to classify

engineering tools to improve manageability of sustainability risks in supply chain context is

rarely available in literature. Driven by this research gap, in this paper a classification scheme of

engineering tools to manage sustainability risk is presented. A conceptual model for mapping

typical of supply chain sustainability risks with their engineering tools is proposed. New research

directions from this initial study are presented

Keywords: Supply Chain, Sustainability, Risk, Engineering Tools, FMEA.

Study of Optimization and Kinetic Modelling of Biodiesel

Production from Nyamplung Oil With Microwave Assisted

Extraction (MAE) Method Using Response Surface

Methodology (RSM)

Hakun Wirawasista Aparamarta1, Setiyo Gunawan2, Aang Firmansyah Mochtar3, M. Yusril Izhar Noer4

Email: 1 hakunmarta@gmail.com, 2 setiyogunawan@gmail.com,

3aangfirmansyah01@gmail.com, 4 yusrilizhar7@gmail.com

ABSTRACT : Nyamplung oil (Calophyllum Inophyllum) has great potential as a raw material in

the process of making biodiesel with high oil content and one of the promising sources of non-

edible oil so it does not affect food security. Previous studies have compared biodiesel production

using the Batchwise Solvent Extraction method with the Microwave Assisted Extraction method.

This research was conducted to find the optimal conditions of making biodiesel from nyamplung oil

using RSM (Response Surface Methodology) and also determine the kinetics model of esterification

reaction in the purification of free fatty acids (FFA) in the Microwave Assisted Extraction method.

The method used for optimal operating conditions is to use RSM (Response Surface Methodology)

with Central Composite Design (CCD) while for kinetic modeling is done using a single-order

reaction model. Optimization results obtained using the RSM method (Response Surface

Methodology) with TAG Purify results of 90.45% and FFA Purify of 6.6% with operational

conditions respectively on power 423 and 427 W as well as extraction time 41 and 38 minutes. It

has obtained far faster times than conventional methods that take up to 6 hours. The value of

reaction rate constants significantly rises on the power of 150, 300, and 450 w with the following

results: 0.0057 mol-1, 0.0059 mol-1, and 0.0061 mol-1. But down at power 600 w to 0.0032 mol-1.

From the reaction kinetics model, it was found that the activation energy value using the

Microwave-Assisted Extraction method was 117.44 J / mol, the value was much smaller than the

activation energy value using the conventional method of 4831.26 J / mol. This shows that the

making of biodiesel from nyamplung oil by the Microwave Assisted Extraction method can replace

the conventional method because it requires lower energy and fast time so that the production

process is more efficient.

Keyword : Biodiesel, Nyamplung Oil, Microwave-Assisted Extraction Method, Response Surface

Methodology

South Sumatra Peat Fires Analysis in 2019 using Spatial

Approach

Raden Putra1,*, Tastaptyani Kurnia Nufutomo1, Yuni Lisafitri1, Novi Kartika

Sari1, and Alfian Zurfi1

1 Environmental Engineering Study Program, Institut Teknologi Sumatera, Lampung

Selatan, Indonesia

*Email: raden.putra@tl.itera.ac.id

Abstract. South Sumatra's peatland is the largest on the Sumatra island after Riau province. In

the 2019 dry season, fires re-ignited in most of the South Sumatra peatlands which generated a

haze disaster in the South Sumatra region and beyond. This study aims to analyze the spatial

distribution of South Sumatra's peat fires in 2019 and relate them to the history of peat fires in

the region. In addition, the analysis of peat fires is also directed at the type of land cover in the

study area. In this research, the analysis of peat fires uses the hotspot data approach. Meanwhile,

the land cover class is analyzed using remote sensing data which is processed using geographic

information systems. The results showed that most (81%) of the 2019 peat fires in the study area

took place in areas that had burned in the 1995-2016 period. On the other hand, the most

extensive South Sumatra peat fires in 2019 developed on the type of unmanaged land cover

(shrubs and secondary forests). Based on these results, unmanaged and burnt peatlands have a

high risk of burning in the next dry season. Therefore, the works to prevent and manage peat

fires need to pay attention to the historical factors of fire in the region.

Keywords: Peat fires, hotspot, land cover, dry season

,

Identifying Association between Fire Hotspot Distribution and

PM10 during 2019 wildlife period in South Sumatera,

Indonesia

Novi Kartika Sari1*, Tastaptyani Kurnia Nufutomo1, Yuni Lisafitri1 Alfian Zurfi1

and Raden Putra1

1 Environmental Engineering Study Program, Institut Teknologi Sumatera, Lampung

Selatan 35365, Indonesia

*Email: novi.sari@tl.itera.ac.od

Abstract. Exposure to air pollution from wildfires has high risk to human health and welfare.

Peat fires occurred frequently and emitted particulates in some areas in Indonesia, such as South

Sumatera Province. Fires were commonly found in several areas that affected to an increase of particulate concentration, notably during dry season (June-November). Objective this study aims

to elaborate association between fire hotspot and PM10 as well as its implication based on air

quality index during dry season in 2019. National air quality index of PM10 and remote sensing

data of wind direction and hotspot data were applied to determine their relationship. Spatial analysis was conducted in order to address hotspot distribution from South Sumatra peat fires by

geographic information system. Our study shows that PM10 index during the dry season found

the unhealthy status to human health. The correlation between fires, wind direction, and PM10

index were statistically significant to each other. The PM10 concentration due to peat fires was

considerably coming from southern fires since the wind direction influenced by monsoon season.

The result needs further research related to specific long-term health impact from peat fires in

South Sumatra.

Keywords: Peat Fire, PM10 index, Hotspot, South Sumatra Province.

TIME-DEPENDENT DENSITY FUNCTIONAL THEORY

WITH SPIN-ORBIT COUPLING CALCULATION FOR

PREDICTING PHOTONIC CHARACTER OF

RUTHENIUM - CARBON NITRIDE COMPLEX

Nirwan Syarif, Wulandhari Sudarsono, Muh. Nurdin

Abstract. This paper reports study of photonic character of the complex of ruthenium - carbon

nitride based on the calculations using time-dependent density functional theory with the scalar

zero- order regular approximation (ZORA) and the fully relativistic ZORA of spin−orbit coupling.

The triplet states were being calculated to portrayed phosphorescent event. The approximation

virtually produced orbital degeneracy, as found in zero-field splitting (ZFS). The procedure also

involved the generation of absorption and emission spectra. The results revealed that the

deactivation of photonic event in dd-state of the triplet was inadequate due to a transient structure

for the non-radiative de-excitation of the triplet metal-to-ligand charge transfer state. The

absorption and emission has a very good agreement with the available experimental data. The

energy difference between SOC state 3 and 1 of zero-field splitting (ZFS), is about 145cm−1, in

quite good agreement with the experimental value of 85−170cm−1. The lifetime phosphorescence

for the complex is about 3.1μs, also close to the 2.2−2.8μs from measurements. The energy

difference from the S1 - S1 to the ground state is 2300cm−1. The expected emission color would

be blue and the T1 energy alone resulted green color, but not yellow enough. Using the SOC state

1, the color at about 540nm matches the yellow-green emission color.

Implementation of Reverse Engineering Method for Disc

Refiner Development

Shinta Virdhian*1, Deni Cahyadi1, Muhammad Fathurrohman1, Evi Oktavia2,

and Arief Rahman2

1Balai Besar Logam dan Mesin (Metal Industries Development Center), Ministry of

Industry, Jl. Sangkuriang 12, Dago, Bandung, Jawa Barat, 40135, Indonesia

2Center of Pulp and Paper, Ministry of Industry

Jl. Raya Dayeuhkolot No.132, Dayeuhkolot, Kec. Dayeuhkolot, Bandung, Jawa Barat

40258

*Email: shinta-v@kemenperin.go.id

Abstract. Refining is the process of treating the fiber mechanically so that the fibrillation effect arises

between fibers. This treatment will change the characteristics of the fiber, especially the physical

properties of the paper. The refining process can result in several things such as cutting, splitting, and

crushing (bruising). A disk refiner is an important part in the refining system that consists of two vertical

disks with contoured surfaces. One disk rotates clockwise, while the other remains stationary or rotates

counter-clockwise. The space between the disks can be arranged, depend on the extent of refining

appropriate to the end-use of the paper to be produced. The disc refiner is still imported and there is a

need to manufacture the product locally. The reverse engineering method is proposed to develop the

product. The purposes of this study are to identify the the geometry of disc refiner using 3D scanning,

remodelling the 3D geometry using CAD software, and characterize the disc refiner material such as the

chemical composition, microstructure and hardness. These results will be used to design the

manufacturing process of the disc refiner.

Keywords: Disc Refiner, 3D Scanning, Refining, Reverse Engineering, 3D Modelling

Classification of Civet and Canephora Coffee using Support-Vector

Machines (SVM) Algorithm based on orde-1 Feature Extraction

Robertus Zidan Hadi Suyoto1, M Komarudin2, Gigih Forda Nama3, Titin Yulianti4, 1 Informatics Engineering Study Program, Department of Electrical Engineering, Faculty of

Engineering, University of Lampung, Lampung

Jl. Prof. Sumantri Brojonegoro No.1 Bandar Lampung 35145 2correspondence author: m.komarudin@eng.unila.ac.id

*Email : robertus.zidan1020@students.unila.ac.id, gigih@eng.unila.ac.id, titinyulianti@gmail.com.

Abstract - Identification of types of coffee beans is a process carried out in determining the types of civet and

robusta coffee. The selection of civet coffee manually by the community in determining the type of coffee beans.

This makes the process slow and there is no certainty whether the selected coffee stated original civet coffee or a

mixture with Robusta coffee, for that it needs to be built a system in identifying the types of coffee beans. In this

study the classification technology used for the selection process of Civet and Robusta coffee beans. This research

uses first-order feature extraction with SVM algorithm which aims to recognize patterns of civet and robusta

coffee beans using texture analysis on grayscale images and feature extraction. In the study, the authors used the

Rapid Application Development research methodology to build the system. The results of feature extraction will

be an SVM illogical input for classifying the types of civet and robusta coffee beans. The data used in this study

were 120 images, consisting of 110 training data images and 10 test data. The results of the accuracy of this

method reached an accuracy rate of 87.27% success in identifying the types of coffee beans.

Keywords: civet coffee, robusta coffee, classification, SVM

The Dynamics of the Repong Damar Vegetation in

Krui Pesisir Barat

Sugeng P. Harianto1, Bainah Sari Dewi1, and Afif Bintoro1, *

1Department of Forestry, Faculty of Agriculture, University of Lampung, Jl. Prof.

Sumantri Brojonegoro No. 1 Bandar Lampung 35145, Indonesia

* Email: sugeng.prayitno@fp.unila.ac.id

* Email: bainahsariwicaksono12@gmail.com

* Email: afif.bintoro@fp.unila.ac.id

Abstract Repong Damar is a plantation management system that is cultivated and managed by

the Krui community, Lampung. The time of this research was conducted in July 2020. The

research locations were carried out in Pahmungan and Pekon Gunung Kemala Pekon. The

method used in this research is 25 plots in Pahmungan Pekon and 25 Mount Kemala Pekon Plots,

Krui, Pesisir Barat Regency, Lampung Province, Indonesia. This study aims to determine the

dynamics of Repong Damar vegetation. In Pahmungan Pekon found 19 species of tree phases

with a total of 131 trees. 13 species of pole phase trees, 6 types of sapling phase trees, and 26

species of undergrowth and seedling phase trees. In Pekon Gunung Kemala, there were 7 types

of tree phases, 7 types of tree pole stages, 4 types of tree piles, and 17 species of plants under the

seedling phase. The most dominant tree species in Pahmungan Pekon and Gunung Kemala Pekon

are Damar, so that the Dappiness Value Index (INP) of Damar trees in Pahmungan Pekon is

119.44 and INP in Pekon Gunung Kemala is 178.711. Communities in Pahmungan Pekon and

Gunung Kemala Pekon still depend on the economy of the community by searching for gum

resin (Shorea javanica), Repong Damar is the success of agroforestry managed by local

communities which are still traditional. the Pahmungan Pekon and the Mount Kemala Pekon.

The need for government education in protecting the cat eye (Shorea javanica) ecosystem in

Krui,

Keywords: Repong Damar, Resin cat's eye, Pekon Pahmungan, Pekon Mount Kemala, SAP,

resin.

Effect of austempering temperature on impact toughness prop-

erties of AISI 4140 steel

M Badaruddin*, B Bakti, B Prasetyo, Sugiyanto

Department of Mechanical Engineering, Faculty of Engineering, Universitas Lam-

pung, Jalan Prof. S. Brojonegoro No. 1 Bandar Lampung 35145, Indonesia

*Email: mbruddin@eng.unila.ac.id

Abstract. An AISI 4140 steel was isothermally heat treated by the subsequent austempering

temperature for increasing its impact toughness properties. The microstructural observations and

Charpy-impact tests were conducted. The results showed that the austempering heat treatment

subjected to an AISI 4140 steel resulted bainite microstructure which the structure of bainite

was depending on isothermal temperature of bainite formation. The microstructure of bainite is

considerably responsible to increase in impact properties of the steel. This change microstruc -

tures in the AISI 4140 steel increased toughness and caused a significant increase in the impact

fracture toughness. In the present study, toughness properties were influenced by transformation

temperature of bainite formation during the subsequent austempering heat treatments, which

resulted he mechanical stability and morphology of retained austenite but also characteristic of

bainite microstructure in the steel must be taken into account when applying an austempering

heat treatment in AISI 4140 steel. The dimples-fracture morphologies of the austempered steel

exhibit that the higher resistance of AISI 4140 against impact energy absorption was strongly

resulted by the finer microstructure of bainite phase.

Keywords: AISI 4140 steel, austempering, bainite, impact energy, dimple fracture

Pattern of Batik Kawung and Parang Rusak Identification

Based on First Order Statistical Feature Extraction Method

A T Nugroho, B E Cahyono, A S Ismahu, and P D Putri*

Department of Physics, Faculty of Mathematics and Natural Science, University of

Jember, Jalan Kalimantan No. 37 Jember 40132, Indonesia

*Email: pratidinaputri@gmail.com

Abstract. Batik is unique Indonesian traditional drawing art which is expressed on a piece of

fabric. Every region has its own batik pattern related with local historic and wisdom. This

research identify the Kawung and Parang Rusak batik base on the value of first order statistical

feature. There are four steps to identify the pattern of Kawung and Parang Rusak batik: data

preparation, pre-processing images, feature extraction, feature selection, and training images. In

the pre-processing image divided in to two type there are: grayscale image for Batik Kawung and

black-white image for Batik Parang Rusak. The result of this study for batik Batik Kawung has

characteristic mean value is 0.55, standard deviation value is 0.27, and entropy value is 7.22. The

result of this study for batik Batik Parang Rusak has characteristic mean value is 0.44, standard

deviation value is 0.49, and entropy value is 0.99. The conclusion of this study is first order

statistical feature extraction method can be used to identify the characteristics of batik patterns.

Keywords: Batik, statistical feature extraction, characteristics.

Geophysical Approach for Assessment of Seawater Intrusion

in the Coastal Aquifer of Bandar Lampung, Indonesia

Rustadi1,3,*, I G B Darmawan2, N Haerudin2, Suharno2, and A Setiawan 3

1 Department of Environtment Science, Universitas Lampung, Jalan Prof. Soemantri

Brojonegoro No.1, Bandar Lampung 35145, Indonesia

2 Department of Geophysical Engineering, Universitas Lampung, Jalan Prof.

Soemantri Brojonegoro No.1, Bandar Lampung 35145, Indonesia

*Email: rustadi_2007@yahoo.com

Abstract. Overexploitation in 1980-2000 caused a lot of loss of groundwater in the aquifer

coastal of Bandar Lampung. Groundwater has been degraded with increasing salinity due to the

intrusion of seawater. In 2013, the intrusion has extended 400 m from the coastline. Subsurface

geological mapping is carried out with the aim of examining the material constituents of alluvial

formations and the ability to transfer seawater to land. Combined research through 3 well

exploration, combined with 3 geoelectric tomography and 51 points of gravity. The gravity

method used to map the existence of structures that can connect coastal aquifers and land

aquifers. Geoelectric tomography to map the presence of aquifers and low resistivity zones by

seawater intrusion. The coastline has relatively shallow aquifers at a depth of 2 - 10 m in a sand

layer with coral inserts, while the lower part is composed of silt and clay. The aquifer has

experienced a decrease in resistivity of fewer than 10 ohms m appears in the three circular

patterns, caused by seawater. In addition to the permeable zone of shallow aquifers, there is a

northwest southeast trending structure, which can be channeling seawater to land aquifers.

Keywords: coastal aquifer, intrusion, geophysics, Bandar Lampung

Reservoir Properties Prediction Using Seismic Inversion and

Geostatistical Integration

O Dewanto1, D Arlinsky1, and RC Wibowo1,*

1 Department of Geophysical Engineering, Faculty of Engineering, Universitas

Lampung, Jalan Prof. Dr. Soemantri Brodjonegoro No. 1 Bandar Lampung 35145,

Indonesia

*Email: rahmat.caturwibowo@eng.unila.ac.id

Abstract. Seismic inversion involves mapping the physical structure and properties of the

subsurface of the Earth using measurements made on the surface and possibly constrained by

well log measurements. Traditionally, inversion has been applied to post-stack seismic data, with

the aim of extracting acoustic impedance volumes. However, we used inversion results to directly

predict lithology parameters such as porosity. On the other hand, geostatistics provides a toolbox

for the geologist to use in analysing data and transferring such analysis and interpretation to the

task of reservoir forecasting. Another very important benefit of geostatistical methods is the

availability to assess uncertainty associated with kriging and co-kriging using stochastic

methods. The main conclusion of this paper is that the interpretation of acoustic impedance from

seismic data, can significantly reduce inter-well estimation uncertainty and that this method is

suitable for reservoir characterization and similar studies in petroleum engineering. Also, by

combining seismic inversion with geostatistics leads to significant results. The Kriging model is

smooth and we have observed that for the studied area Kriging with External Drift (KED) is more

accurate than co-kriging when estimating the depth of thehorizon when there is insufficient data.

Keywords: seismic inversion, geostatistical inversion, KED, porosity, reservoir

Analysis effect of wind speed variation on the design horizontal

axis wind turbine with Qblade software

Ahmad Saudi Samosir 1, A Riszal 2

1 Department of Electrical Engineering, Universitas Lampung, Bandar Lampung,

Lampung, Indonesia. 2 Department of Mechanical Engineering, Universitas Lampung, Bandar Lampung,

Lampung, Indonesia.

Email: saudi.ahmad@gmail.com

Abstract. Wind energy is renewable energy as environmentally friendly energy. One of the

utilization of wind energy conversion is wind turbine. Wind turbine is energy conversion

device to convert wind energy into mechanical energy and convert it into electricity through

generator. The size of the power produced by wind turbines, one of which depends on the

wind speed and type of turbine used. So in this riset, researchers will design wind turbine

with wind speed variations. The purpose of the design and analysis of variations wind speed

is to design a low speed wind turbine and use model with a number of blades 5 wind turbine.

The object of this study was the design of wind turbines with variations in wind speed of 2

m/s, 3 m/s,4 m/s, 5 m/s and 6 m/s with a number of blades 5 wind turbine horizontal axis,

rotor diameter of 1.4 m and this rotor used NACA 4412 airfoil type. The method use Blade

Element Momentum (BEM) and design simulation used Q-Blade software. The results of

the design of wind turbines with wind speed variations show that there is an increase in

power as the wind speed increases.

Keywords: Wind Turbine, Qblade Software,Blade Element Momentum (BEM).

Analysis of Maktec MT 923 Finishing Sander Machine

Maintenance using Reliability Centered Maintenance (RCM)

Method at PT. Bothwell Indonesia

D Tauhida1, A D Prabaswari2, B W utomo3, and A G Wiguna4

1 Department of Industrial Engineering, Faculty of Engineering, Universitas Muria

Kudus, Jalan Lingkar Utara UMK, Gondangmanis, Kudus 59327, Indonesia

2,4 Department of Industrial Engineering, Faculty of Industrial Technology,

Universitas Islam Indonesia, Jalan Kaliurang km. 14,5 Sleman, Yogyakarta 55584,

Indonesia

3 Department of Industrial Engineering, Sekolah Tinggi Teknologi Adisutjipto, Jl.

Janti Blok. R, Lanud Adisutjipto, Yogyakarta, 55198, Indonesia

*Email: atyanti.dyah@uii.ac.id

Abstract. PT. Bothwell Indonesia is a furniture company that produce tables, chairs, cabinets

and other products. As a manufacturing company, the production process at PT. Bothwell

Indonesia used machinery and equipment to facilitate operators. The reliability of the machine is

the main point to guarantee a smooth production process and good product. According to the

observations, machinery and equipment at PT. Bothwell Indonesia often fails so it can disrupt

the production process. Aim of this research is analyse the failure of the machinery and machine

maintenance activities to get an effective and efficient machine maintenance system. Based on

the analysis results, there are 2 types of machines: hand machines and fixed machines. The hand

machines have a high failure rate, it can be seen at the purchase data from the maintenance

department, so hand machines need to be taken seriously. Machine maintenance system at PT.

Bothwell Indonesia still uses the old system. The problems such as engine failure have become

commonplace because there is no record of maintenance activities and SOPs on each machine,

so machine maintenance activities cannot be done routinely. This study uses the Reliability

Centered Maintenance (RCM) method with several tools including FBD, FMEA, LTA, and TS.

Keywords: furniture, machine maintenance, RCM

Aerodynamic drag reduction on the application of suction

flow control on vehicle model with varied upstream velocity

R Tarakka1*, N Salam1, Jalaluddin1, W Rauf1,2 and M Ihsan3

1 Department of Mechanical Engineering, Faculty of Engineering, Hasanuddin

University, Jalan Poros Malino, KM.6, Gowa, 92172, Indonesia 2 Department of Mechanical Engineering, Faculty of Engineering, Gorontalo

University, Jalan Jenderal Sudirman, Gorontalo 96211, Indonesia 3 Sekolah Tinggi Teknik Baramuli, Pinrang, 91215, Indonesia

*Email: rustan_tarakka@yahoo.com

Abstract. The innovation in the automotive industry must prioritize the issue of energy security

and the environment. One aspect of the innovations is regarding the development of more

aerodynamic vehicle design. The study of vehicle aerodynamics has been considered as very

important, due to its direct relation to the safety and efficiency factors of energy utilization. The

application of suction active control on the onset region of flow separation is one example of the

efforts. This study aims to analyse the effect of the application of active control by suction to the

aerodynamic drag of the vehicle model through qualitatively observations of flow dynamics and

quantitatively pressure fields. The test model is a modified Ahmed body with 35° slant angles

and varied flow orientations. This study has been conducted in both numerical computation and

experimental testing at a suction velocity of 1.0 m/s and upstream velocity of 11.1 m/s, 13.9 m/s,

and 16.7 m/s, respectively. The results have found out that the application of active control has

been able to delay the process of flow separation, to increase the pressure coefficients on the back

wall, and to reduce aerodynamic drag by 10.8487% for computational methods and 10.9748%

for experimental methods.

Keywords: flow control, pressure coefficient, aerodynamic drag

Coal Velocity and Proximate Analysis Relationship Using

Multiple Linear Regression

S Erfani1, FM Siregar1, A Zaenudin1, Rustadi1, IBS Yogi1 and RC Wibowo1*

1 Department of Geophysical Engineering, Faculty of Engineering, Universitas

Lampung, Jalan Prof. Dr. Soemantri Brodjonegoro No. 1 Bandar Lampung 35145,

Indonesia

*Email: rahmat.caturwibowo@eng.unila.ac.id

Abstract. Coal properties such a velocity (Vp) is important to build a lateral distribution of coal

seam using seismic data. The experimental determination of velocity analysis is sophisticated,

long time consumed, and expensive, on the contrary, statistical approach such as linear regression

can be run rapidly. The two main objectives of the study were to develop models for coal velocity

using well log data variables (density and natural Gamma-Ray) and found the relationship

between velocity with proximate analysis results. Multiple linear regression (MLR) methods

were applied to estimate relationship between Vp estimated and proximate analysis. By

conducting cross-validation, the prediction analysis of the models has been tested by using R2.

The result showed that between Vp estimated versus Vp log have R2

0.80 and Vp estimated versus proximate analysis that reflected have R2 of 0.52. The main merit

of the correlations is the ability to estimate the relationship between Vp and proximate analysis,

then applied that correlation to distributed in seismic volume to obtained coal seam characteristic.

Keywords: velocity, coal, multiple linear regression, proximate, prediction

Design Optimization of Guide Vane Geometry of Kaplan

Turbine

Sirojuddin1,*, B C H Nugroho1, I Ekayana1, H R Aziz1 and S Harahap1

1 Department of Mechanical Engineering, Faculty of Engineering, Universitas Negeri

Jakarta, Jalan Rawamangun Muka, Jakarta 13220, Indonesia

*Email: sirojuddin@unj.ac.id

Abstract. Guide vane is component to control the inflow of water to the runner of blade in Kaplan

turbine to get maximum power, to regulate flow of water, and to stop flow of water. This research

aims to optimize the guide vane geometry to obtain a good streamlined flow trajectory, and

optimum thickness. The 2D geometry design was drawn with AutoCAD while 3D models using

Inventor and the flow simulation processed by Solidworks flow simulation software. The water

discharge was 0.1 m3/s, head 5 m with a 4.9 kW theoretical power of turbine. The geometry of the

guide vane using NACA 6412 airfoil with 90 mm chord, 75% thickness, and the 6 variations of

the radius. From the optimization processed and simulation results, it was found that the variant

GV-6 was the best guide vane.

Keywords: Design optimization, guide vane, kaplan turbine, NACA 6412

Investigation of The Runner Blades Arrangement with Gap,

without Gap, and Overlap Geometry against The Power

Generated by The Kaplan Turbine.

Sirojuddin1,* , H R Aziz1 , B C H Nugroho1 , I Ekayana1 , A A Jumhur1 and S

Harahap1

1 Department of Mechanical Engineering, Faculty of Engineering, State University of

Jakarta, Jalan Rawamangun Muka Raya, Jakarta 13220, Indonesia

*Email: sirojuddin@unj.ac.id

Abstract. One of the most important components in the Kaplan turbine to get maximum power

and efficiency is the runner blade, especially the arrangement of the geometry. This research

aims to investigate the runner blade arrangement without a gap, with gap and overlap geometry

against the power generated by the turbine. An investigation based on the safety factor value the

power generated and efficiency achieved. The design parameters based on 5 m head, 0.1 m3/s

water discharge, and a theoretical turbine output of 4.9 kW with 3 blade variants. The 2D blade

geometry design used the airfoil profile NACA 2412 and is drawn with Autocad, while the 3D

design and strength analysis proceeds by Inventor and flow simulation using SolidWorks

software. From simulation results shown that the RB–3 variant was the best runner blades with

optimum safety factor and maximum power.

Keywords: Blade arrangement, investigation, kaplan turbine, maximum power, safety factor

Investigation of Conical Draft Tube of Kaplan Turbine with

Spiral Liner and without Spiral Liner using CFD Simulation

Sirojuddin1,*, I Ekayana1, B C H Nugroho1, H R Aziz1, A Kholil1 and S Harahap1

1 Department of Mechanical Engineering, Faculty of Engineering, State University of

Jakarta, Jalan Rawamangun Muka, Jakarta 13220, Indonesia

*Email: sirojuddin@unj.ac.id

Abstract. The draft tube is a component in the Kaplan turbine to create positive suction pressure

using kinetic energy that is not used when leaving the turbine runner and increasing turbine

power efficiency. This research aimed to find out the highest efficiency of variant geometries of

a conical draft tube with spiral liner and without the spiral liner. The design geometry was

processed using 2D software and 3D using Inventor and simulated in Solidworks software. The

inlet water discharge was 0.1 m³/s with head 5 m and theoretical turbine power 4.9 kW. Based

on the simulation results showed that the spiral liner draft tube variant was the best power and

efficiency.

Keywords: Draft Tube, efficiency, kaplan turbine, kinetic energy, spiral liner

Flow drag across three minibus car models arranged in

tandem in four configurations

N Salam1, R Tarakka1*, Jalaluddin1, M Ihsan2, and Muh. Annur Jimran1

1 Department of Mechanical Engineering, Hasanuddin University, Makassar, Indonesia 2 Sekolah Tinggi Teknik Baramuli, Pinrang, Indonesia

rustan_tarakka@yahoo.com

Abstract. The purpose of this study was to determine the drag coefficient of fluid flow across

three minibus cars arranged in tandem in four configurations and to determine the optimum drag

coefficient across the three cars. Flow drag measurements have been conducted on a wind tunnel

by force balance measurement. The minibus car models with a 1:40 ratio to the originals were

constructed from iron material with a thickness of 1 mm. The three minibus cars are arranged in

four configuration models where car 1 with 2 are arranged in series while car 3 position

changeable according to the configuration. Each configuration model was treated with 6 changes

in the distance of the car to 3, while the distance between car 1 and 2 was constant, with similar

7 levels of treatment of velocities ranging from 8 m/s to 20 m/s. The results show a similar drag

coefficient (Cd) pattern in all configuration models, where smaller Cd related to greater velocities

and smaller distances of the three cars. Furthermore, at a similar Re=49,608, the smallest Cd

was obtained in model III (Cd=0,78), and followed by model II (Cd=0,80), model IV (Cd=0,81)

and model I (Cd=0.84). Keywords : flow drag coefficient, three tandem minibus cars, four

configuration models

Geospatial analysis of optimal routing for fire disaster

mitigation in Makassar city

Bimo Aji Widyantoro, Purnama Budi Santosa

Department of Geodetic Engineering, Faculty of Engineering, Universitas Gadjah

Mada, Jalan Grafika No.2, Bulaksumur, Yogyakarta, Indonesia

Email: aji.widyantoro.bimo@gmail.com, purnamabs@ugm.ac.id

Abstract. Makassar city experiences many residential fire disasters during the last years. One of

the possible causes why fires are difficult to overcome is due to the late response of the

firefighters. Due to a unique traffic condition in Makassar City, which is one of the densest traffic

cities in Indonesia, firefighters cannot come to the fire plots on time due to traffic conditions. To

overcome this problem, the development of a geospatial route analysis can helpfirefighters find

the best route to a fire point quickly. Geospatial route analysis is currently a key role in

emergency responses for urban fire disaster. A routing system can provide network analysis that

allows users to navigate between source and destination point. In this case, the system can help

firefighters to arrive as quickly as possible. On complicated road networks, there are some

impedance factors that would slow down drivers on a particular road. In this regards, this study

is aimed at providing alternative routes for firefighters from the base stations to disaster locations

of residential fires. The method used in the studies is Dijkstra's algorithms to calculate weights

of the impedance factors to optimal routing based on length road, speed drive, and traffic

conditions. Implementation of routing analysis using open source geospatial software,

PostgreSQL as database management system with PostGIS, and pgrouting as extensions. The

modeling results show that the optimal route selection with speed parameters based on road

classification has a low weight value. It can be used as a reference for selecting firefighters

routing.

Keywords: fires, disaster, pgrouting, optimal routing, geospatial analysis, PostgreSQL

Conversion of Microalgae Nannochloropsis sp. into Bio-crude

Oil using Low-temperature Hydrothermal Liquefaction

F A M Jhoni, and Y S Pradana*

Chemical Engineering Department, Faculty of Engineering, Universitas Gadjah Mada,

Jalan Grafika No. 2, Yogyakarta 55281, Indonesia

*Email: yanopradana@ugm.ac.id

Abstract. Nowadays, fuel production from microalgae is an alternative way to overcome the

depletion feedstock of fossil fuels. One of the proposed processes for microalgae to fuel

conversion is hydrothermal liquefaction (HTL). This research investigated low-lipid microalgae

Nannochloropsis sp. conversion into products (bio-crude oil, water phase, solid residue, and gas)

in a batch pressurized reactor. The yields of each product were evaluated by varying temperatures

(200 and 225oC) and residence times (10, 20, 30 minutes). The highest yield of bio-crude oil was

0.59%, resulted at temperature of 225 oC, residence time of 10 minutes, and biomass-water ratio

of 1:10. In this condition, the yield of solid residue and the water-soluble liquid product were at

the lowest level. However, the higher temperature and the longer residence time caused higher

gaseous component.

Keywords: Low-temperature hydrothermal liquefaction, microalgae, Nannochloropsis sp., bio-

crude oil

Spectrophotometric Analysis of Caffeine in Local Product of

Arabica : Observed at Different Roasted Temperatures

Misto, K Alawiyah, N P Lestari, L Rohman, Supriyadi, Mutmainnah and E

Purwandari*

Department of Physics, Faculty of Mathematics and Natural Sciences, University of

Jember, Jalan Kalimantan No. 37 Jember 68121, Indonesia

*Email: endhah.fmipa@unej.ac.id

Abstract. Indonesia's geographical location supports the existence of various coffee

commodities. As a plantation commodity, coffee has a fairly high economic value. Coffee has a

lot of substance that is beneficial to the body, one of is caffeine that serve to increase the stamina.

Caffeine is naturally present in many types of plants as secondary metabolism. This research was

done to know the content of caffeine in a local Arabica pure coffee with their variation of roasted

temperatures as well as knowing the characteristics of Arabica coffee from organoleptic test. This

study was conducted using UV-Vis spectrophotometer at 273 nm wavelength. The test results

showed that the highest caffeine content was on samples of pure Arabica coffee with a roasted

temperature of 195°C and 215°C. Caffeine content in sequential 3.217% and 2.597%. The results

of organoleptic testing of Arabica coffee is dominated by fragrant aroma and taste good.

Keywords: Arabica coffee, Caffeine, UV-Vis spectrophotometer

Application of EPQ Model to Minimize the Total Cost of

Inventory of Refined Sugar Product at X Company

E R Wijaya1*, Titania1

1 Logistics Management of Agro Industry, Polytechnic ATI Padang, Jalan Bungo

Pasang, Tabing, Padang, Indonesia

*Email: edorantou@gmail.com

Abstract. Overload is a condition where the goods stored in the warehouse exceed the existing

capacity. With the accumulation, it will increase the storage cost for the products/goods stored.

The purpose of this research is to help companies determine the optimal amount of production,

optimal production time intervals and maximum product inventory so that there is no excess

stock of products in the warehouse, and to obtain a minimum total inventory cost by using the

Economic Production Quantity (EPQ) model. To collect the data needed in this study, secondary

data is used which consists of production data and product delivery of company X. From the

research results, the optimal production rate (Q*) is 13,646 MT/production cycle with an optimal

production time interval of 1.16 months. or equal to 35 days, the maximum amount of inventory

(Imax) is 429 MT. The total minimum inventory cost in one production cycle/month is

Rp.167,925,698.28, -. The difference in total inventory costs generated using the EPQ method

and calculations based on company conditions is 9% or equivalent to Rp.16,538,501, -. Based on

the results of the sensitivity analysis it is known that all parameters are sensitive to Q*, Imax, and

total inventory costs. However, a significant change is the parameter of saving costs, where the

increase and decrease in saving costs will decrease and increase Q*, Imax, and the total cost of

inventory.

Keywords: EPQ, optimal production rate, maximum amount of inventory, sensitivity analysis

Reservoir Properties Modeling Using Multi-Attribute Seismic

Analysis: Case Study South Sumatra Basin

B S Mulyatno1, F S Parameswari1, N Hikmah2, O Dewanto1 and R C Wibowo1,*

1 Department of Geophysical Engineering, Faculty of Engineering, Universitas

Lampung, Jalan Prof. Dr. Soemantri Brodjonegoro No. 1 Bandar Lampung 35145,

Indonesia

2 PT Pertamina EP Asset 2 Prabumulih, South Sumatera

*Email: rahmat.caturwibowo@eng.unila.ac.id

Abstract. Seismic inversion and multi-attribute analysis method are used in this research to

characterizes the reservoir properties. Where both of these methods will be resulted an

acoustic impedance volume and log property volumes. The property log volumes were created

from density, porosity, Gamma-Ray (GR) and Water Saturation (Sw) log. There are 4 wells

that is used in this research, they are EM-31, EM-32, EM-33 and EM-34 and a 3D seismic

data post- stack time migration. Based on a map of acoustic impedance distribution, the

reservoir target has an acoustic impedance value of 6.000 ((m/s)*(g/cc)) to 8.000

((m/s)*(g/cc)). Furthermore, based on the map of the distribution of the log property, reservoir

has a density value with a range of 2.3 g/cc up to 2.4 g/cc, porosity value > 10%, GR value of

less than 100 API and Sw 50% to 55%. Thus, it can be concluded that reservoir has a lithology

of sandstones, has a fairly good porosity and contains oil fluids.

Keywords: multi-attribute seismic, reservoir, south sumatra basin, modeling

Synthesis and Characterization Exopolysaccharide from

Algae Spirulina sp. using Technique Sol-Gel as Absorbent Ion

Metal Pb(II)

R A Kausar1*, Buhani1*, and Suharso1, A Setiawan1

1Departement of Chemistry, Faculty of Mathematics and Natural Sciences, University of

Lampung, Jalan Prof. Soemantri Brojonegoro No.1, Bandar Lampung, 35145, Indonesia.

*E-mail: radhoalkausar@gmail.com; buhani_s@yahoo.co.id.

Abstract. In this study, a modification of exopolysaccharide (EPS) from Spirulina sp. algae biomass

with silica (HES) and exopolysaccharide from Spirulina sp. algae biomass with silica coated by

magnetite particles (HESM) has been done successfully. A series of experiments with the Batch

method were conducted to test the ability of HESM adsorption of Pb(II) ions in solution. Identification

of functional groups of HESM adsorbents was studied using infrared spectrophotometer (IR) while

surface morphological analysis and composition of the constituent elements of HESM were performed

using scanning electron microscope-energy (SEM). Concentration of Pb(II) ion in the adsorption

process were analysed by inductively coupled plasma- atomic emission spectrometry (ICP-AES

Adsorption of Pb(II) ions with HES and HESM is optimum at pH 7 and consentration at 25 ppm with

the adsorption capacity on HES at 3.85 mg g-1 while on HESM at 272.63 mg g-1, contact time of 15

min and it tends to follow second orde pseudo kinetic model and Langmuir adsorption isotherm model.

Keywords: Sol-Gel, exopolysaccharide,adsorption,silica coated magnetite.

Investigation and modelling of the flood control system in the

Aerotropolis of Yogyakarta International Airport

Shofwatul Fadilah1*, Istiarto1, and Djoko Legono1

1 Department of Civil and Environtmental Engineering, Faculty of Engineering,

Universitas Gadjah Mada, Jalan Grafika No. 2 Kampus UGM, Yogyakarta 55281,

Indonesia

*Email: shofwatul.fadilah@mail.ugm.ac.id

Abstract. The New Yogyakarta International Airport has become one of Indonesia’s National

strategic projects and potentially support the development of the Aerotropolis area around the

airport. Located at the southern coast of Yogyakarta with the existence of rivers at the upstream

of the airport, flooding can be a threat to the Aerotropolis area and the Yogyakarta International

Airport. This research aims at investigating and modelling the flood review the existing design

of the flood control system of the Aerotropolis area and find out the possible option of better

flood control in the area. The one-dimensional HEC-RAS was used to simulate the flood and its

control in the Aerotropolis area. Simulation of flood control options includes river normalization,

optimization of flood gates, use of retarding basin and flood pumps. The present study proposed

adjustment of performing. Alternative flood control at each flood-prone area was adjusted to the

level of flooding risk in the area. In conclusion, the use of retarding basin and flood pumps highly

recommended to prevent the flooding at the Aerotropolis area of Yogyakarta International

Airport.

Keywords: Friction welding, orthopaedic implant, pin, spiral defect

Investigation of muscle contraction on motorcycle handlebar

using electromyography

H Soewardi1, K A Hasibuan2

1,2Industrial Engineering Department, Universitas Islam Indonesia

Yogyakarta, Indonesia

E-mail: 1hartomo@uii.ac.id 2aanhsb@gmail.com

Abstract:

A motorcycle is commonly used by people in Indonesia as a transportation device. It because

this device is flexible and affordable as well as easy to maneuver. However, the risk of driving a

motorcycle is an emergence of the Carpal Tunnel Syndrome (CTS) on the wrist aside from the

accident. This syndrome occurs when tissues surrounding the flexor tendons swell, providing

pressure on the median nerve. It is caused by the vibration on the motorcycle handlebar that

results from the engine and it will impair the muscle work. The objective of this study is to

investigate the correlation between the Flexor Carpi Ulnaris muscle contraction and vibration

occurred in the motorcycle handlebar and how much the muscle contraction comes about. An

experimental study was conducted in an ergonomic laboratory in which six respondents have

participated. Electromyography was used to identify Maximum Voluntary Contraction (MVC)

on Flexor Carpi Ulnaris muscle which is functioned as controlling the throttle, clutch and brake

levers. Manual and automatic motorcycle with 110 and 125 machine capacity, and 1000 and 5000

speed level for a case study. Statistical analysis was conducted to test the hypothesis. The result

of this study shows that the percentage of maximum voluntary contraction on flexor carpi ulnaris

is higher on a manual motorcycle than the automatic motorcycle in 5000rpm for 110 and 125

machine capacity respectively in which it will be higher as long as vibration increase on a

motorcycle handlebar.

Keyword: Vibration, Muscle Contraction, Electromyography, Flexor carpi ulnaris, Motorcycle

Numerical modelling for steady state condition of geothermal

system in Way Ratai

Karyanto1, 2, *, Nandi Haerudin2, Suharno2, I Gede Boy Darmawan2, Muhammad

Adli2, and Posman Manurung3

1 Doctoral Program of Mathematics and Natural Science, University of Lampung,

Jalan Prof. Soemantri Brojonegoro No.1, Bandar Lampung 35145, Indonesia

2 Department of Geophysical Engineering, University of Lampung, Jalan Prof.

Soemantri Brojonegoro No.1, Bandar Lampung 35145, Indonesia

3 Department of Physics, University of Lampung, Jalan Prof. Soemantri Brojonegoro

No.1, Bandar Lampung 35145, Indonesia

*Email: karyanto@eng.unila.ac.id

Abstract. Numerical modelling of Way Ratai Lampung geothermal system aims to model the

geothermal system in steady state condition. Numerical simulation showed quantitative model of

reserve geothermal energy resources calculation and modelling hydrothermal fluid flow and heat

energy transfer in geothermal system. The simulation is using program HYDROTHERM

INTERACTIVE by applying Newton-Raphson algorithm for non-linear differential system,

Slice Successive Over Relaxation (SSOR) algorithm, and Generalized Mini Residual (GMRES)

for linear system. The trajectory profile of the study area is 18 km (NW-SE) and 5 km vertical

using a 100 m, 200 m and 500m grid respectively. The simulation running until the 100.000 year

with 1000 years time interval. The result show the geothermal reservoir potential has a length

range of approximately 8 km with a thickness between 0.5-1.5 km with temperature range is

between 250-350 ° C. The reservoir depth ranges from 600-1200 meters below with a fairly thick

cap rock. These results significantly at period of 25,000-50,000 years identified as the steady

state condition for the Way Ratai geothermal system. Furthermore, with a large enough area and

thickness and a fairly high reservoir temperature, the Way Ratai geothermal potential can be

categorized as a high enthalpy system.

Keywords: Steady state, numerical model, heat transfer, geothermal, Way Ratai

The Effects of Ozonation and Ultrasonic Cavitation on Batik

Wastewater Treatment with Coagulation-Flocculation as

Pretreatment

I N J Siahaan1, A E Saputra1, dan E F Karamah1*

1Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia,

Kampus UI Depok 16424, Indonesia

*Email: eva.fathul@ui.ac.id

Abstract. The batik industry produces large volumes of wastewater with high organic content.

Dyes in batik wastewater are difficult to degrade by biological processes. Therefore, further

processing is needed to reduce pollutants before being released into the environment. This study

aims to observe the performance of the ultrasonic cavitation, ozonation, and combination of

ozonation/ultrasonic cavitation to treat batik wastewater, which is first given a coagulation-

flocculation pretreatment with Polyaluminium Chloride (PAC) coagulants. The variations

applied are ultrasonic intensity (20%, 30%, and 60%) and pH of wastewater (4, 7, and 10). In

this study, it was found that the combination of the ozonation/ultrasonic cavitation method with

a pH of 4 and ultrasonic intensity of 20% produced the best performance, namely COD, TSS,

and color (Pt-Co) removal of 77.02%, 95.15%, and 94.88%. The ultrasonic intensity and initial

pH of wastewater play an important role in the performance of the treatment process. In the

ultrasonic cavitation method with an ultrasonic intensity of 20%, the highest percentage of COD,

TSS, and color (Pt-Co) removal was 65.59%, 91.51%, and 93.41%. The ozonation method in

acidic conditions (pH 4) produced better performance with COD, TSS, and color (Pt-Co) removal

of 70.51%, 94.35%, and 96.10% for 60 minutes.

Keywords: Batik wastewater, coagulation, flocculation, ozonation, ultrasonic cavitation

The Potential of Urban Agriculture for Greening Grey

Infrastructure: The Case of Simple, Low Cost Apartment

Buildings in Jakarta

Hayuning Anggrahita1, Guswandi2, Ravidania Auni3, Fedo Syahputra Lubis4

Email: 1 hayuning.aggrahita@gmail.com, 2 guswandi4@gmail.com, 3 revidania@gmail.com,

4fedosyahputralubis98@gmail.com

ABSTRACT : Jakarta has experienced urbanization and rapid development leading to great

physical changes. 90% of its areas are built-up. Moreover, they reduce green spaces. Greening grey

infrastructures can be a solution. Previous studies found that rooftop of buildings as part of grey

infrastructures can create multi-functions including food production, strengthening food security.

However, there is lack of research on rooftop agriculture in Asian mega cities including Jakarta.

This research analyses the potential of urban agriculture for greening the rooftops of simple, low-

cost apartment buildings (Rusunawa) in Jakarta. They are classified into two types: ‘flat’ ones (atap

‘datar’) that are suitable for urban agriculture; and ‘non-flat’ ones (atap ‘tidak datar’) that are not

suitable for it because of safety reason. To do so, we collect data of Google Earth, free high-

resolution images for the identification of urban land cover/use by classifying physical objects e.g.

the rooftops. We choose 11 of 22 Rusunawa. The findings are surface of flat rooftops is 60.304 m2;

and that of non- flat ones is 5.730 m2. Thus, 91% of them are potential for agriculture.

Keyword : Roof-top agriculture, simple and low-cost apartment, grey infrastructure, greening,

Jakarta

The Effect of Ozonation on the Chemical Structure of

Microplastics

A N Fitri1, D Amelia1, and E F Karamah1*

1Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia,

Jalan Fuad Hasan, Depok, 16424, Indonesia

*Email: eva.karamah@yahoo.com

Abstract. Microplastics accumulated in wastewater are not easily susceptible to microbial

degradation, thus persist in the environment. Moreover, microplastics pose a danger to aquatic

biota and human. Effective technological solutions to degrade microplastics in wastewater

treatment plants are desirable. Biodegradation is one of the most applied techniques but takes a

long time. This study evaluates the ozonation as pre-treatment to transform the chemical structure

of polyethylene microplastics into more susceptible to biodegradation. The process is done by

using a corona-discharge ozonator and batch reactor which is varied by pH value (6, 7, 8, 10,

12), ozone flowrate (1, 3, 5 L/min), and contact duration (1, 2, 3 hours). The study began by the

quantification of OH radicals and dissolved ozone, ozonation of microplastics, and evaluation of

ozonation by gravimetric weight loss also the change of microplastics chemical structure through

FT-IR (Fourier Transform Infrared). The results revealed chemical structure changes of

polyethylene after ozonation, confirmed by the appearance of carbonyl bonds and the loss of

weight. The optimum operating condition appeared at pH 12 with 5 L/min ozone flowrate which

resulted in 0,0482% weight loss and carbonyl bond intensity reached 104,556% after 3 hours

ozonation.

Keywords: Biodegradation, microplastics, ozone, ozonation, polyethylene

Batik Wastewater Treatment by the Hydrodynamic

Cavitation and Ozonation with Coagulation-Flocculation

Pretreatment

A E Saputra1,*, I N J Siahaan1, and E F Karamah1

1 Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia,

Kampus Baru UI Depok 16424, Jawa Barat, Indonesia

*Email: andreasexasaputra1@gmail.com

Abstract. Wastewater discharged by Batik’s industry still contains a high concentration of dyes

and pollutants, thus can contaminate the water’s ecosystem. Because of that, in this study, Batik

wastewater is treated by the hydrodynamic cavitation, ozonation, and combination of those two.

By using PAC, a coagulation-flocculation-based pretreatment technic is conducted first to

increase the effectiveness of the main wastewater treatment process. Then, variations in flow rate

(2 L/min, 4 L/min, and 6 L/min) and initial pH of wastewater (4, 7, and 10) are evaluated to

analyze its effect on the pH changing and the degradation of TSS, COD, color (Pt-Co), and TOC.

The best result obtained from this research is by the application of the combination technic, which

can eliminate 95.19%; 78.85%; 96.42%; and 60.56% of TSS, COD, color (Pt-Co), and TOC,

respectively after 60 minutes treatment.

Keywords: Batik Wastewater, Coagulation, Hydrodynamic Cavitation, Ozonation

Characteristics of Ultrasonic Velocity of Eggs Using HC-SR04

Module

YE Putra1, SR Sulistiyanti1*, and AS Samosir1,

1 Department of Electrical Engineering, Universitas Lampung, Jl. Prof. Soemantri

Brojonegoro No.1, Bandar Lampung. 35145, Indonesia

*Email: sr_sulistiyanti@eng.unila.ac.id

Abstract. This article discusses about characteristics of ultrasonic wave propagation in eggs. The

objects used are three types of eggs; Broiler eggs, domestic eggs and ducks. The method of

determining the egg characteristics used ultrasonic waves. Ultrasonic wave can propagate on

objects, materials and components. The HC-SR04 is used as ultrasonic wave transmitter and

receiver. Ultrasonic waves are transmitted to the surface of the eggs. The distance between the

eggs and the HC-SR04 module is 5 cm and 10 cm. The testing process is carried out on 10 eggs,

of each type. The distance and time propagation parameters are used as information to produce

the ultrasonic velocity of the egg. The testing and calculation process shows that duck eggs have

the highest speed value.

Keywords: Eggs, Ultrasonic Wave, HC-SR04, Ultrasonic Velocity.

DESIGN OPTIMATION OF SHAFTS FOR SHREDDER

MACHINE WITH 25 LITRES CAPACITY Sirojuddin 1 * , William M . Rosadi 1 and Syamsuir 1

1 Mechanical Engineering, Universitas Negeri Jakarta , Jakarta 13220, Indonesia

* e-mail: sirojuddin@unj.ac.id

Abstract. Plastic is item that can’t detached of human life, both in terms of daily use as well as to

activities industry. The fact in 2019 there were 69 million tons of plastic waste. To proccess

plastic waste need a shredder machine in this research. The form of plastic waste that will

be shredded are of plastic bottles, plastic jars, jerry cans, etc. This research aims to

optimize the design of shaft for the shredder machine with a capacity of 25 litres . It starts

by calculating the torque passed from the motor, determine the multilevel shaft diameter

and the connection of the pegs to the blade , the depth and length of the pegs. 2D designs

will be drawn using AutoCAD software and then continued to create 3D designs using

Autodesk Inventor software. Shafts will be analyzed yield strength using Solidworks

software and showed a maximum yield strength of the highest in the region meet of the

shaft and a blade, then the shaft will be tested using the gear ratio of 1:5 to see how much

power is needed to achieve well shredded results.

Keywords: Shafts optimation, torque, yield strength, power.

Production and Characterization of NiO Modified-Activated

Carbon from Palm Shell Waste by Chemical Activation with

K2CO3 and Physical Activation

Yuliusman1 and Raisa Aulia Hanifah2,*

1 Process Intensification Research Group, Chemical Engineering Department,

Universitas Indonesia, Kampus Baru Universitas Indonesia, Depok 16424, Indonesia

2 Chemical Engineering Department, Universitas Indonesia, Kampus Baru Universitas

Indonesia, Depok 16424, Indonesia

*Email: hanifahraisa@gmail.com

Abstract. Activated carbon made from palm shell waste is processed through the process of

dehydration, reduction, and chemical activation using a potassium carbonate (K2CO3) solution

with a mass ratio of 1:1. Furthermore, the sample was carbonized and continued with second step

chemical activation with a variation in the mass ratio of K2CO3 (1:1 and 3:2). Samples that have

been chemically activated then undergo physical activation flowed with N2 gas. The synthesized

activated carbon has the best surface area at a mass ratio of 3:2 which is 1202 m2/g. Modifications

were made to increase the adsorption capacity of activated carbon synthesized. In this study, the

modification was carried out by impregnating metal oxides in the form of nickel oxide (NiO) into pores of activated carbon with a concentration variation of 0.5%, 1%, 2%. NiO impregnation

reduces the surface area of activated carbon up to 802 m2/g at a 2% concentration variation.

Keywords: Activated carbon, potassium carbonate, palm shell, chemical activation

BLADE DESIGN OF SHREDDER MACHINE WITH 25

LITRES CAPACITY FOR PLASTIC WASTE

Sirojuddin 1 * , M . Ridwan Ali S. 1 and Syamsuir 1

1 Mechanical Engineering, Universitas Negeri Jakarta , Jakarta 13220, Indonesia

* e-mail: sirojuddin@unj.ac.id

Abstract. Indonesia produces 69 million tons of plastic waste in 2019, plastic waste always

increase every year, where as the excess of plastic waste can harm the environment

and cause the disease. Plastic waste treatment process need a shredder machine. Form

of plastic waste that will be shredded in this research such as plastic bottles, plastic

jars , jerry cans, etc. This research aims to design blade for a 25 litre capacity shredder

machine, it start with determining the diameter of the blade, the number edge of blades,

the angle of the blade and the profile shape of the blade. 2D blade designs were drawn

using AutoCAD software and continued to create 3D designs using Autodesk Inventor

software. Blades will be analyzed running process dynamics using Solidworks

software. With a gear ratio of 1:5 blade will be tested to know how much moment is

needed to achieve good shredded results.

Keywords: Shredder machine, blade design, dynamics process, moment

CASING DESIGN OF SHREDDER MACHINE

WITH 25 LITRES CAPACITY FOR PLASTIC

BOTTLE WASTE

Sirojuddin1*, G. Adam Fairuzy.1 and Syamsuir1

1 Mechanical Engineering, Universitas Negeri Jakarta, Jakarta 13220, Indonesia

*e-mail: sirojuddin@unj.ac.id

Abstract. Waste as always be a problem every year. Indonesia produces 69 million tons of

plastic waste in 2019, plastic waste increases every year, where excess plastic waste could

damage the environment and cause disease. The waste especially plastic bottle will be

shereddered by shredding machine. Waste that will be shredded in this research is plastic

bottles, jerry cans, and plastic jars. As a support for the safety factor of the shredder machine,

casing is needed to protect the operator from work accident and aim the waste directly to the

knife. This research work is aimed designing casing for shredder machine began with

preminary calculation to determine machine dimension. Before designing the case, it must be

known first the capacity of the engine and power to drive the engine. The 2D design of the case

for sheredder machine were drawn using AutoCAD software, and continued to create 3D

design using Autodesk Inventor software. Then continued the process manufacturer for the

case, last assembly the case to the shredder machine.

Keywords: Waste, Shredder Machine, Plastic Bottle, Safety factor

Microalgal Biodiesel as An Alternative Fuel: Technological

Study of Conversion Process in Indonesia

Y S Pradana *, B R Sadewo, and L Prasakti

Chemical Engineering Department, Faculty of Engineering, Universitas Gadjah Mada,

55281, Yogyakarta, Indonesia

*Email: yanopradana@ugm.ac.id

Abstract. Microalgae-based biodiesel has appeared as a potential alternative to overcome food-

fuel conflicts of existing edible plant-based biodiesel production. Several advantages of

microalgae-based biodiesel namely growth rate, high lipid content, can grow in harsh

environments and the ability to absorb CO2. This paper focuses on analyzing and selecting the

most suitable microalgae to biodiesel conversion technology in Indonesia using Multi Criteria

Decision Analysis method with sub-method of SMARTER, called SMARTER-MCDA. Four

most promising technologies in microalgae oil conversion resulted from the preliminary study

are heterogeneous catalyzed transesterification with microwave irradiation assisted technology

(HCT), enzyme-based catalyzed transesterification (ECT), non-catalytic transesterification using

supercritical methanol (NCT), and in-situ transesterification (ICT). Those technologies are then

assessed using several criteria, i.e. easiness in application, conversion productivity, solvent ratio,

energy requirement, additional material, and environmental impact. The total score of

SMARTER-MCDA results heterogeneous catalyzed transesterification with microwave

irradiation assisted technology as chosen technology for microalgal oil conversion into biodiesel.

Keywords: Biodiesel, microalgae, oil conversion, SMARTER-MCDA

Production of palm shell based activated carbon by two stage

phosphoric acid impregnation and physical activation

Yuliusman1* and T M Afifah1

1 Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia,

Depok 16424, Indonesia

*E-mail: usman@che.ui.id

Abstract. Activated carbon (AC) as a promising gas adsorbent has been widely used in various

applications. One of the raw materials that can be utilized is palm shell waste. Palm shell has

great potential in terms of quantity and composition as raw material for AC. Palm shell waste

production in Indonesia is classified as high and increasing every year. The high amount of

carbon and low ash in the palm shell can produce good porous carbon. In this study, The Palm

shell was processed through preparation, carbonization, and activation. After being dried and

reduced in size, the palm shell was immersed in phosphoric acid (H3PO4) for 24 hours and

continued with carbonization at 350ºC for 30 minutes. Then, it was second chemically activated

by H3PO4 with activator mass variations and physically activated by N2 gas at 600ºC for 1 hour.

AC with the best characteristics was produced by a mass ratio of 2:1 in the second chemical

activation. The iodine number and surface area obtained are 1164 mg/g and 1158 m2/g.

Furthermore, Pores have formed perfectly on the surface of carbon and the carbon content of AC

has reached 76.9%.

Keywords: Activated carbon, palm shell, phosphoric acid

High-Performance Scale Model for a Wind Turbine

with Deflector Knockdown System

Sirojuddin1,*, M. Haris1, I. R. Ramadhan 1, H. Suharjo1, A.A. Jumhur and

A. Kholil1

1 Department of Mechanical Engineering, Faculty of Engineering, State University of

Jakarta, Jalan Rawamangun Muka, Jakarta 13220, Indonesia

*Email: sirojuddin@unj.ac.id

Abstract. Factors affecting the value of the power generated from the Vertical Axis Wind

Turbine (VAWT) Darrieus Wind Turbine (DWT) are the blade size and blade shape. Also,

there is a very significant effect, namely the use of deflectors. The purpose of this research

is to investigate the use of deflectors without radius and with radius compared without

deflectors. The 2D design is made with AutoCAD, 3D with Inventor and SolidWorks,

and with direct testing. The analysis is done through CFD software analytical calculations

and experiments. Based on experimental results, when using a deflector without a radius,

the power increase is above 30%, when using a deflector with a radius of 125 mm, an 80%

increase in power is obtained compared to without a deflector.

Keywords: Deflector, High Performance, Knockdown System, Scale Model, Wind

The Effect of Carbon Nanotube Addition and Empty Palm Oil

Fruit Bunch Fiber Form Variation on Mechanical Properties

of Epoxy Composite

Praswasti P D K Wulan1,*, Y Yolanda2, and U P Syahrudin2

1 Department of Chemical Engineering, Faculty of Engineering, Universitas Indonesia,

Jl. Margonda Raya, Pondok Cina, Kecamatan Beji, Kota Depok, Jawa Barat 16424,

Indonesia

2 Sustainable Energy Research Group, Department of Chemical Engineering, Faculty of

Engineering, Universitas Indonesia, Jl. Margonda Raya, Pondok Cina, Kecamatan

Beji, Kota Depok, Jawa Barat 16424, Indonesia

*Email: wulan@che.ui.ac.id

Abstract. In this study, the addition of carbon nanotubes (CNT) is a reinforcing material in the

composite material for epoxy resin and oil palm empty fruit bunches. The fiber form is variated

to chopped strand, chopped strand mat, and woven rovings. To obtain compatibility, CNT needs

to be given functionalization treatment. Covalent functionalization is carried out by the method

of mild acid oxidation with nitric acid and added hydrogen peroxide. Silane coupling agents are

used to strengthen the bonding of composite components. The results obtained from this study

were an increase in Young’s modulus of the composite material in the addition of CNT 0.5%

(mass%) and modification of woven rovings fibers by 10.98%, 38.90%, 62.29% relative to the

composite without CNT. Composite with 0.5% CNT and 40% woven rovings fiber have the

opportunity to be developed into a 6.80 GPa Young modulus bumper.

Keywords: Carbon Nanotube, Composite, Empty Palm Oil Fruit Bunch Fiber, Epoxy, Silane

Coupling Agent

WATER ABSORPTION, DENSITY, STRENGTH

STRENGTH, AND ELASTICITY MODULE OF GREEN

COMPOSITE MATERIAL BASED ON NEWSPAPER

WASTE AND MATRIX OF GARUT UMBI STATES

(Maranta Arundinaceae L.): EFFECT OF FORMING

TEMPERATURE WASTE

1, a Dewi Ulul Azmi, 1, b Sujito, 1, c Imam Rofi'i

1 Department of Physics, Faculty of Mathematics and Natural Sciences, Jember University

Kalimantan Street 37, Jember 68121, Indonesia

a dewiululsdm@gmail.com, b sujito.unej@gmail.com, c imr.rofii@gmail.com

Green composite is a type of composite material whose entire constituent components come from nature and can

be degraded naturally. This material is expected to reduce the impact of environmental pollution due to materials

composed of synthetic materials. The green composite marerial in this study uses arrowroot tuber starch and

newspaper waste. Arrowroot tuber starch has good mechanical properties and is expected to improve the

characteristics of green composite synthesis results. Meanwhile, newspaper waste has a high holocellulose content

which is expected to improve the mechanical properties of the synthesized material. Green composite in this study

was synthesized using a hot pressed machine with several variations of pressing temperature. The pressing

temperature is an important process parameter that can improve the characteristics of the green composite. There

are four variations in pressing temperature used, namely 160oC, 170oC, 180oC, and 190oC. The synthesized material

is then characterized to determine the effect of pressing temperature on material characteristics. The synthesized

material is then characterized to determine the effect of pressing temperature on material characteristics.

The results showed the pressing temperature can affect the material characteristics. Material density

increases with increasing pressing temperature from 160oC-180oC, but decreases at 190oC. The largest material

density is (1.14 ± 0.06) g/cm3 at 180oC pressing temperature and the smallest material density is (1.03 ± 0.03)

g/cm3 at 160oC pressing temperature. An increase in pressing temperature decreases the water absorbency of the

material. The highest material water absorption of (69.5 ± 0.7)% is at 160oC compression temperature, while the

lowest water absorption at (50.9 ± 1.4)% is at 190oC compression temperature. An increase in pressing temperature

of 160oC-170oC increases the tensile strength and modulus of elasticity of the material, but decreases when the

pressing temperature is 180oC-190oC. The highest tensile strength and modulus of elasticity were obtained at

170oC compression temperature of (9.04 ± 0.90) MPa and (120 ± 15) MPa, while the smallesttensile strength and

modulus of elasticity at 190oC was (4.0 ± 0.8) MPa and 76 ± 14 MPa. Based on SEM test, the presence of voids

and fiber deformation is influenced by the pressing temperature during material synthesis.

Influence of groundnut shell ash on compressive and tensile

strengths of concrete

Samsunan1,*, Inseun Yuri Salena1, Rosiana2 and Ruslaini2

1 Department of Civil Engineering, Faculty of Engineering, Teuku Umar University,

Alue Peunyareng street, Ujong Tanoh Darat, Meureubo, Aceh Barat, Aceh 23615,

Indonesia

2 Students of Civil Engineering, Faculty of Engineering, Teuku Umar University, Alue

Peunyareng street, Ujong Tanoh Darat, Meureubo, Aceh Barat, Aceh 23615,

Indonesia

*Email: samsunan@utu.ac.id

Abstract. Research objectives are to determined the effect of groundnut shell ash used as partial

cement replacement on concrete compressive strength. Groundnut shell ash obtained from the

combustion results and passed sieve No. 200. Design mix is 21.7 MPa, with different variation

percentage of groundnut shell ash in the order of 0%, 5%, 7.5%, 10% and 12.5% as partial

replacement of cement for mixes. Total of 60 concrete specimens with 150 mm diameter and

height 300 mm long were cast and tested for compression and tensile strength in 14 and 28 days.

The result according to variations percentages in compression strength test on average at the age

of 14 were 18,495; 19,250; 20,382; 22,647 and 20,005 MPa. Whereas 28

days were 18,495; 19,250; 20,382; 21,703 and 22,741 MPa. The results in tensile strength at

the age of 14 respectively were 2.218; 2,029; 1,746; 1,557 and 1,463 MPa and 28-day age

concrete respectively were 1,934; 2,029; 2,123; 2,029 and 1,840 MPa. The highest compressive

and tensile strength in days 14 were 22,647 and 2.218, and in days 28 were 22,741 and 2,123. It

was observed that the strength has increased and groundnut shell ash seems promising material

in concrete production.

Keywords: Groundnut shell ash, compressive strength, tensile strength and normal concrete

Development of Local Bioceramic Scaffolds for Bone Tissue

Applications

Dwi Gustiono1*, Nendar Herdianto1, Mochammad Dachyar Effendi1, Seto

Roseno1, Ika Maria Ulfa1, Winda Rianti1, Lukmana1 and Ferdiansyah Mahyudin2

1. Centre for Materials Technology, Agency for Assessment and Application of

Technology, Gedung 224 Puspitek Tangerang Selatan, Banten, Indonesia

2. Orthopedic and Traumatology Department, Medical Faculty of Universitas

Airlangga/Dr. Soetomo Hospital, Surabaya, East Java, Indonesia

*E-mail : dwi.gustiono@bppt.go.id

Abstract.

Hydroxyapatite is the main constituent material of bone and teeth. In this paper, hydroxyapatite

powder material was made from local limestone with a simple chemical method. The porous

hydroxyapatite material is prepared by replica techniques using polymer sponges. The

characterization of this hydroxyapatite material is carried out by chemical, physical and

biological methods. The results of analysis using FTIR and XRD equipment showed that the

hydroxyapatite characteristics are similar to natural ones. The result of measurement with TEM

equipment shows that the invisible particles of this hydroxyapatite powder have a rod-like shape

and are about 30-60 nm in size. The porous hydroxyapatite materials made with replica

techniques revealed a pore size of about 200-500 µm and had good interconnections as

determinated by SEM measurements. Biological test results in rabbit animals show that the

implantation of this hydroxyapatite material can stimulate bone growth faster than if it is allowed

to grow alone (control). Bone ingrowth was significantly increase with time between 3 and 6

weeks.

Synthesis and Characterization of Hydroxyapatite

Bioceramics From Serai Snail Shells and Mangrove Crab

Shells in West Tanjung Jabung Beach: Effect of Milling

Process

R Utami1,*, D Gustiono2,*, M D Effendi2, S Roseno2, H D Fahyuan1, and Nasri

MZ3

1 Departement of Physics, Faculty of Science and Technology, University of Jambi, Jalan Jambi-Ma. Bulian KM 15, Mendalo Darat, Jambi 36361

2 Centre for Materials Technology, Agency for Assessment and Application of Technology, Gedung 224 Puspitek Tangerang Selatan 15314, Banten, Indonesia

3 Departement of Geophysics, Faculty of Science and Technology, University of

Jambi, Jalan Jambi-Ma. Bulian KM 15, Mendalo Darat, Jambi 36361

*Email: ikatami36@gmail.com, dwi.gustiono@bppt.go.id

Abstract. Hydroxyapatite (HA) is a calcium phosphate compound that is used as a substitute for

damaged body tissues, such as bone and dental implants. HA has been synthesized from the serai

snail shells and the mangrove crab of west tanjung jabung, Jambi province using the dry method.

Calcination of the shell at 1000 °C for 12 hours produces CaO, then contact of CaO with air

produces Ca(OH)2 which is used as a source of calcium in HA synthesis. Milling time variations

for 0 hours, 3 hours, and 6 hours. Sintering at 600 °C for 2 hours produces HA as characterized

by using X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), and particle size analysis

using Particle Size Analyzer (PSA). HA which has the highest accuracy of lattice parameters is that which is milling for 3 hours. The diffraction pattern shows the formation of the HA phase

accompanied by several other calcium phosphate phases at an angle of 2θ. The FTIR spectrum

shows the presence of PO43- and OH-groups from HA. PSA analysis shows the longer the milling

makes the smaller particle size.

Keywords: Serai snail shell, crab shell, hydroxyapatite, dry method, synthesis.

Performance Analysis of Newton-Raphson Power Flow

Computations Based on Power and Current Mismatches

Lukmanul Hakim*, Khairudin, Umi Murdika, Zulmiftah Huda and Herri

Gusmedi

Department of Electrical Engineering, Universitas Lampung, Jalan Prof. Soemantri

Brojonegoro No.1, Bandar Lampung 35145, Indonesia *Email: lukmanul.hakim@eng.unila.ac.id

Abstract. This work studies the performance of single-phase power flow computations

implemented using vector-based Python scripting language. Two approaches are considered,

namely the current mismatch and power mismatch based on Newton-Raphson method. Both

approaches are developed using rectangular coordinates and tested through a variety of IEEE test

systems modelling high voltage transmission networks. The computational burden and accuracy

of both implementations are duly discussed. This work will be later incorporated into our vector-

based Non-linear Primal-Dual Interior Point Method as constraints.

Keywords: power flow, vector form, current mismatch, power mismatch, Newton-Raphson

Design And Experiment Vortex Gravitation Turbine Model

Laboratory Scale F A Herbhakti1, R Hantoro1,2 1Engineering Physics, Sepuluh Nopember Institut of Technology ITS 2Ocean Engineering, Sepuluh Nopember Institut of Technology ITS

Abstract. The vortex gravity system has a main component consisting of a tube which later

produces a whirlpool, and a water tank as the main source of water storage. When flowing water

into the tube, the water flow into the outlet hole in the tube and formed a whirlpool which is

continued back through the pipe to the water tank below. The outlet holes in the tubes have 4

sizes, 12, 9, 6, 3 cm in each tube size. The size of the tube has 3 sizes namely 35, 30, 25 cm. This

research is based on experimental tests to determine the performance of the flow at the diameter

of the tube outlet against the formation of a vortex on the vortex tube. From several studies that

have existed the type of outlet hole in this tube has not been thoroughly examined. From the

results of the expansion can be seen differences in the results of each size of the outlet hole in the

tube. So it can be seen from the test results that changing the size of the tube outlet, the

performance obtained is different. Given this problem, this study was conducted with the aim of

obtaining performance and efficiency in the vortex air outlet tube. The vortex system on a

laboratory scale, looking at previous studies varying the diameter of the vortex tube and the outlet

tube of the tube, this study examines the effect of the difference (ratio) on the diameter of the

vortex tube and the outlet hole of the tube. Experimental results show that the velocity has

increased in the 35 cm diameter tubes and fluctuations in the 30 cm and 25 cm diameter tubes.

The ups and downs in the velocity are caused by the available energy in the flow of water being

extracted after hitting an outlet hole in the vortex tube. The velocity graph in the test shows that

the highest velocity occurs in the 30 cm diameter tube

Keywords: Vortex tube diameter, tube outlet hole, whirlpool.

Comparison Study Of Cross – Organizational Cultural Between

Public University Institution and State-Owned Company in

Indonesia

Rinda Oktia Cahyaningsih1 and Adithya Sudiarno2

1,2 Departement of Industrial Engineering, Institut Teknologi Sepuluh Nopember, 60111

Surabaya, Indonesia

Email : 1 rindaoktia@gmail.com, 2 adithya.sudiarno@gmail.com

Abstract. One of the proponents of economics power is the success of business, the achievement of

targets in workplace. The presence of generation millennials in majority and the increasingly rapid

use of technology in Industrial Era 4.0 will have an impact on organizational culture in the workplace.

This study aims to examine the cross organizational cultural in both institutions Public University

and State-Owned Company to analyze the organizational culture modelling its significant influence

on organizational performance. The analysis results of cross organizational culture modelling to

formulate recommendation for the application of organizational culture in Public University consists

of system values, attitudes, norms, and behavior. The conceptual modeling that used in this study

consisted of six latent variables related to organizational culture and generation millennials with two

mediating variables can significantly influence Organizational Performance. This model is then

tested using the Structural Equation Modeling (SEM) method. The results show that on the object of

Public University all variables have a significant effect, except for one insignificant variable:

Transformational leadership on Organizational Citizenship Behavior. Meanwhile, State-Owned

Company all variables have significant influence, except for 3 variables: Transformational leadership

on Organizational Citizenship Behavior, as well as Transformational leadership and Organizational

citizenship behavior on organizational performance.

Keywords: Organizational Performance, Cross-Organizational Cultural Modelling, Organizational

Culture, Structural Equation Modeling (SEM)

An Application of Fuzzy Shortest Path for Designing Public

Transportation Route (A Case Study in Yogyakarta,

Indonesia)

I Rosyida1,*, Sugiyanto2, TSN Asih1, SB Waluya1

1 Department of Mathematics, Faculty of Mathematics and Natural Sciences,

Universitas Negeri Semarang, Kampus Sekaran, Semarang 50229, Indonesia

2 Department of Mathematics, Universitas Islam Negeri Sunan Kalijaga, Yogyakarta,

Indonesia

*Email: iisisnaini@gmail.com

Abstract. Bantul Regency is one of the regions that became popular in Yogyakarta Special

Region Province (YSR/DIY). There are many tourism sector in Bantul, therefore it became a

favorite destination for tourists not only from Java but also from other islands in Indonesia. Public

transportations have become a necessity in Bantul because the condition is more crowded,

especially during the holiday season. We propose Trans Bantul buse routes which connects

districts in Bantul. A route between two places contains indeterminate parameters, such as

distance, time, and cost. Therefore, it is suitable to represent the route in a fuzzy network,

especially fuzzy weigthed network. In this research, we design a computation of finding fuzzy

shortest paths for route of “Trans Bantul” bus. Firstly, we present the distances between two

places in triangular fuzzy numbers. Then, the method used for finding the shortest paths is a

combination between Chuang-Kung algorithm and Yadav-Biswas algorithm. Lastly, the crisp

value of shortest distance is obtained using graded mean value. Our results show that we may

apply three routes, i.e: route 1 from “Giwangan” bus station to “Baru beach” with shortest

distance 30.8 Km; route 2 from “Giwangan” bus station to “Parangtritis” bus stop with shortest

distance 26.8 Km; and route 3 from “Giwangan” bus station to Dlingo district with shortest

distance 20.8 Km.

Keywords: Chuang-Kung algorithm, Yadav-Biswas algorithm, fuzzy weighted network,

transportation, fuzzy shortest path.

A Combination Among Fuzzy Graph, Fuzzy Chromatic

Number, and Fuzzy Inference System for Traffic Light

Assignment

I Rosyida1,*, Nurhaida2, A Narendra3 and Widodo4

1 Department of Mathematics, Faculty of Mathematics and Natural Sciences,

Universitas Negeri Semarang, Kampus Sekaran, Semarang 50229, Indonesia

2 Department of Civil Engineering, Faculty of Engineering, Universitas Negeri

Semarang, Kampus Sekaran, Semarang 50229, Indonesia

3 Department of Mathematics, Faculty of Mathematics and Natural Sciences,

Universitas Papua, Jalan Gunung Salju Amban, Manokwari, Papua Barat, Indonesia

4 Department of Mathematics, Faculty of Mathematics and Natural Sciences,

Universitas Gadjah Mada, Jl. Sekip Utara, Yogyakarta, Indonesia

*Email: iisisnaini@gmail.com

Abstract. Conventional traffic arrangements with fixed phases and static timing of green lights

may potentially cause a heavy traffic jam particularly in peak time at densely populated regions.

Since there are indeterminate phenomena in conflicting movements, we offer a fuzzy graph

model to describe traffic flows on an intersection. We design an algorithm which the steps are as

follows. Firstly, we represent traffic flows as vertices and conflicting traffic flows as edges of

the fuzzy graph. We assign a degree of membership on each edge that represents a degree of

conflict between two vertices. Two vertices connected by an edge mean that the flows are in

conflict and should be assigned in different phases. Secondly, we determine minimum number

of phases needed on the intersection through fuzzy chromatic number which produce fuzzy phase

scheduling with respective degree of safety. Lastly, we calculate duration of green lights using a

Mamdami-FIS by setting queue length of flows in a phase scheduling as the inputs, creating fuzzy

rules, and duration of green light as the output. We evaluate the algorithm through two case

studies on signalized intersections at Semarang City (Indonesia) and compare the results to the

existing system. The case study shows that the number of phases suits the traffic intensities

(volumes) and the proposed algorithm can reduce cycle time of the traffic light and meets the

standard cycle time compared with the existing system.

Keywords: Fuzzy graph, fuzzy chromatic number (FCN), fuzzy system, phase, traffic light,

Mamdani-FIS

Evaluation of Space Utilization in Vertical Residential Complex in

Jakarta

Hayuning Anggrahita1, Guswandi2, Fedo Syahputra Lubis3, Ravidania Auni4, Maria Hedwig Dewi5

Email: 1 hayuning.aggrahita@gmail.com, 2 guswandi4@gmail.com,

3fedosyahputralubis98@gmail.com, 4 revidania@gmail.com, 5 mhdsusilowati@gmail.com

ABSTRACT : The rapid growth of cities, including Jakarta, encourages the conversion of non-built-

up areas into built-up ones. It can threat their sustainability. To overcome a decreasing trend of

green open space, Government of Jakarta (GoJ) has established a policy stipulating that urban areas

must have at least 30% green open spaces. Therefore, vertical residential complex can be a solution

to reach it especially in Simple and Low-Cost apartment buildings (Rusunawa). Based on previous

issues, this paper analyses their surface, whether it reaches the regulation or not. Moreover, this

paper identifies factors influencing the surface. We study 10 Rusunawas in Jakarta. Then, we

conducted descriptive spatial analysis through the interpretation of high-resolution satellite imagery

to find patterns of open space use in the Rusunawas. The findings are that: in average, the surface of

green open space is 16% of total surface of Rusunawa and the only one is in accordance with the

regulation (34%), indicating difficulties to meet the regulation. Based on the interview with the

management of Rusunawa, the findings are that: land supply is limited; on other side, demand for

housings is high. To solve this problem, innovative solutions are needed to increase green open

spaces both horizontally and vertically

Keyword : Green open space, space utilization, simple and low-cost apartment, Rusunawa, Jakarta

A Case Study Analysis on the Role of Value Management in

the Construction Industry and the Philippines in Managing

the Design

R.C.D.Laqui1, G.N.Legaspi2, M.J.M.Meris3, and D.L.Silva4*

School of Civil, Environmental, & Geological Engineering Mapúa

University, Muralla St. Intramuros, Manila 1002, Philippines

1rcdlaqui@gmail.com 2clawhermon@gmail.com

3julianmeris25@gmail.com

*Corresponding Author E-mail: 4dantesilva2000@yahoo.com

Abstract – Value management has not gained popularity among construction firms throughout the

world. The study aims to evaluate the role of value management and the advantages that it gives

in the construction industry, particularlythe adaptation in the Philippines. A literature review was

applied to the advantages and challenges of value management. Besides, a multiple case study

analysis was conducted on how different countries have adapted value management. A

questionnaire survey was used to, determine the challenges in the adaptation of value

management, determine the measures to improve job performance obtained from applying value

management and determine the benefits of value management in managing the design which was

analyzed using Mean Item Score and Ranking. The results were used to compare the role of value

management method practice in private company contractors and government contractors using

Spearman’s Correlation Test and Hypothesis Testing. The involvement of the respondents in the

use of VM was 46% and 70% of the respondents from the private and public contractors,

respectively, showed that there is a healthy use of the method. Moreover, upon the utilization of

Spearman’s correlation and hypothesis testing, it revealed that private and public contractors do

not see these challenges in adapting value management, the measure to improve job performance

in the adaptation of VM is seen effectively by both private and public contractor, The benefits of

VM are significant to both of the private and public contractors.

Keywords: Value Management, Methodology, Cost Overrun, Sustainability, Cost Management

Comparison Study of PHBA-intercalated Mg/Al-LDH and

PHBA-immobilized Mg/Al-LDH: Characterization and

Application for [AuCl4]̄ Removal from Solution

Lutfi Aditya Hasnowo1,*, Sri Juari Santosa2, and Bambang Rusdiarso2,

1 Department of Nuclear Chemical Engineering, Polytechnic Institute of Nuclear

Technology, Yogyakarta, Indonesia

2 Department of Chemistry, Faculty of Mathematic and Natural Science, Universitas

Gadjah Mada, Yogyakarta, Indonesia

*Email: lutfi.aditya@batan.go.id

Abstract. Synthesis of p-hydroxybenzoic acid (PHBA)-intercalated Mg/Al-LDH and PHBA-

immobilized Mg/Al-LDH have been conducted. PHBA-intercalated Mg/Al-LDH hybrid was

synthesized by co-assembly process of Mg/Al-LDH nanosheets and PHBA anions. PHBA-

immobilized Mg/Al-LDH was prepared by indirect synthesis, where PHBA anions were attached

on surface of the Mg/Al-LDH material. Characterization by X-ray Diffraction showed that the

PHBA-intercalated Mg/Al-LDH hybrid has the lattice parameter of a=3.02 Å, lattice parameter

of c=46.77 Å and basal spacing d003=15.14 Å, where PHBA has been intercalated in interlayer

of the hybrid. The PHBA-immobilized Mg/Al-LDH has lattice parameter of a=3.06 Å, lattice

parameter of c=23.70 Å and basal spacing d003=7.90 Å. The analytical result confirmed that

PHBA has been attached on surface of the hybrid for PHBA-immobilized Mg/Al-LDH. The

optimum 10 mL of [AuCl4]‾ 100 mg L-1 removal condition of both hybrids were reached at pH

3. The optimum interaction time of [AuCl4]‾ and PHBA-intercalated Mg/Al-LDH hybrid was

250 minutes, respectively, while that for [AuCl4]‾ and PHBA-immobilized Mg/Al-LDH was 150

minutes. Removal of [AuCl4]‾ by PHBA-intercalated Mg/Al-LDH hybrid followed pseudo second order kinetic, whereas by PHBA-immobilized Mg/Al-LDH followed pseudo first order

kinetic. Characterization using stereo photomicroscope confirmed that [AuCl4]‾ could be reduced to Au metal by both hybrids.

Keywords: Layered double hydroxide, p-hydroxybenzoic acid, hybrid material, [AuCl4]‾

removal

COMPARATIVE ANALYSIS OF COMPRESSIVE

STRENGTH OF OYSTER SHELL USED AS PARTIAL

SUBSTITUTE FOR FINE AGGREGATE AND FOR

CEMENT IN CONCRETE

Crissandra Nicole G. Cruz, Jannuz Andro Gierardou F. Reyes, Rey N. Tumbokon

A Thesis submitted to the School of Civil, Environmental and Geological Engineering

in Partial Fulfillment of the requirements for the Degree of

Bachelor of Science in Civil Engineering

ABSTRACT

Over-reliance on natural resources are becoming a problem in the Philippine due to the

ongoing construction and development in the country. Thus, recycled materials from industrial

wastes and byproducts were utilized as replacement material to an environmental-friendly

construction material. A hopeful solution to the challenge of oyster shell waste management is to

utilize the oyster shells as a construction material in concrete. Experimental researches were

conducted on the use of oyster shell partial replacement materials in concrete. The oyster shells have

been used as partial replacement of fine aggregate at the rate of 0%, 5%, 10%, 15%, 20%,

25% and cement in concrete at the rate of 0%, 5%, 7.5%, 10%, 15% and 20%. This research is a

comparative analysis of compressive strength of oyster shell used as partial substitute for fine

aggregate and as partial substitute for cement in concrete based on the published experimental

studies. The paper includes the physical and mechanical properties of the oyster shell as partial

replacement for fine aggregate and cement on concrete and undergone curing days of 3, 7, 14 and

28 days. Various statistical model was used for the predictive analysis. Linear regression models

were used to show the significant difference of the substitution rate of the Oyster shell as partial

fine aggregate and cement to the compressive strength and workability of the concrete. ANOVA

(analysis of variance) were also used to determine whether there are any statistically significant

differences to the substitution rates of oyster shell as partial fine aggregate and cement in concrete

between the compressive strength and workability of the concrete. The statistical model shows that

the partially replaced concrete is not far different from a normal concrete. The research concludes

that oyster shell has a potential to become an alternative sustainable construction material in concrete

with maximum fine aggregate replacement of 30% concrete pavement blocks to 374.58 psi which

is 41% increase comparing to normal concrete with the compressive strength of 265.83 psi and at a

minimum percentage of 7.5% as cement the concrete sample achieved 70.44 with a decrease in

compressive strength by 3%.

Hydrological modelling of Air Bengkulu watershed,

Indonesia, by HSS and HEC-HMS model

G Gunawan1 *

1 Department of Civil Engineering, Faculty of Engineering, University of Bengkulu,

Jalan W.R. Supratman No. 1 Bengkulu 38122, Indonesia

*Email: g.gunawan@unib.ac.id

Abstract. The Peak discharge is data that is needed in planning and managing water resources.

The method for calculating the peak discharge is very diverse, so it is necessary to choose the

most appropriate method according to the conditions of the watershed. The purpose of this study

is to test various reliable estimation methods of the Bengkulu River Basin and to compare the

peak discharge values obtained from each method. The peak discharge will be calculated using

the synthetic unit hydrograph (HSS) method ITB 1, Nakayassu, Snyder and HEC-HMS. From

the results of the calculations that have been done, it is known that the peak discharge values in

the Bengkulu watershed using the HSS ITB 1, Nakayassu, Snyder and HEC-HMS methods

produce different values. This difference is caused by the different parameters used in calculating

the reliable discharge even though the input data are both rainfall. The conclusion of this study

is that the selection of a reliable discharge calculation method in a watershed is very important.

Keywords: synthetic unit hydrograph, ITB-1, Nakayasu, Snyder, HEC-HMS

Partial Discharge Type Detection and Identification Based on

Its Sources

R W Putra1, H H Sinaga1*, N Purwasih1, D Permata1, Y Yuniati1 and H B H

Sitorus2

1 Department of Electrical Engineering, Universitas Lampung, Jalan Prof. Soemantri

Brojonegoro No.1, Bandar Lampung 35145, Indonesia

2 Department of Electrical Engineering, Universitas Pembangunan Nasional Veteran

Jakarta, Jalan RS Fatmawati, Cilandak, Kota Jakarta Selatan, DKI Jakarta 12450,

Indonesia

*Email: herman.h.sinaga @eng.unila.ac.id

Abstract. Partial discharge (PD) is a symptom of initial damage to high voltage equipment

insulators which if left for a long period will cause total damage to high voltage equipment. This

study aims to detect and identify the type of PD based on the source of its discharge so that it can

be useful in terms of monitoring and maintenance of high voltage equipment. In this research, the

Hilbert fractal antenna sensor is used in the detection process of surface, cavity, and corona PD

with different input voltage variables that successfully produce a total of 600 PD signaldata on

the oscilloscope. To reduce noise on the PD signal, the denoising process is done by utilizing the

sym4 wavelet feature found in the MATLAB software. The denoising process generates new data

so that the research data becomes 600 original PD signal data and 600 denoising PD signal data.

With a statistical approach, all PD signal data is extracted successfully into the mean, skewness,

kurtosis, and standard deviation parameters which are useful as input for the PD type

identification process. From each of the PD signal statistical data, 450 data are used in the training

data process and 150 data are used in the data testing process. The PD type identification process

is performed using a back propagation neural network with a mean square error (MSE) level of

0.01. The identification results show that back propagation neural networks are able to identify

PD types based on statistical input accurately. In addition, the denoising process also affects the

accuracy of the identification results of the PD type that is 95.33% for the original discharge

signal to 97.33% for the denoising signal.

Keywords: Partial discharge (PD), PD identification, Hilbert fractal antenna, Back Propagation

Partial Discharge Localization in Power Transformers Using

Fractal Hilbert Sensor

H H Sinaga1*, Y Yuniati1, N Purwasih1, D Permata1 and H B H Sitorus2

1 Department of Electrical Engineering, Universitas Lampung, Jalan Prof. Soemantri

Brojonegoro No.1, Bandar Lampung 35145, Indonesia

2 Department of Electrical Engineering, Universitas Pembangunan Nasional Veteran

Jakarta, Jalan RS Fatmawati, Cilandak, Kota Jakarta Selatan, DKI Jakarta 12450,

Indonesia

*Email: herman.h.sinaga @eng.unila.ac.id

Abstract. Partial discharge (PD) is a symptom of insulation defect or degradation in high-voltage

equipment. Thus, the PD detection is an important diagnostic tool to asses the condition of the

insulation equipments. Apart of PD detection, knowing the PD location on power transformer

will help engineer to determine the severity of the PD events. The location of a PD event inside

a power transformer tank can be find out from the time differences of arrival (TDOA) between

waveforms that are captured by an array of the electromagnetic sensors. The PD location thus

can be calculated using geometric triangulation technique which involves solving a set of non-

linear equations. This can be achieved using an efficient software realization of the maximum-

likelihood estimator. The recorded PD waveforms are affected by the type of sensor used to

capture PD signals. In this paper, the accuracy of the PD localization using different sensors is

investigated. Fractal Hilbert sensors are used to capture the electromagnetic signals emitted from

a PD source. The TDOA is calculated using two methods, i.e first peak and cross-correlation.

The localization result shows the PD signals captured by the fractal sensor can be used to

determine the PD location. The first peak method produces higher accuracy result than the cross-

correlation method.

Keywords: Partial discharge location, fractal Hilbert sensor, waveforms first peak, waveforms

cumulative energy

Identification of Musculoskeletal Complaints on Noken Papua

Craftsmen

S N Kayatun1*, H Purnomo1, F Kurnia2,, and Masniar3

1 Department of Industrial Engineering, Faculty of Industrial Technology, Universitas

Islam Indonesia, Jalan Kaliurang Km. 14,5 Yogyakarta 55584, Indonesia

2 Department of Industrial Engineering, Faculty of Engineering, Universitas

Proklamasi 45, Babarsari, Yogyakarta, 55281, Indonesia

3 Departemen of Industrial Engineering, Faculty of Engineering, Universitas

Muhammadiyah Sorong, Jalan Pendidikan no. 27 Sorong 98416, Indonesia

*Email: 18916127@students.uii.ac.id

Abstract. Efficiency and productivity are closely related to occupational health and safety. Thus,

very important to pay attention on it. Work accidents often occur caused by human error. In this

case, an evaluation related to the risks that occur in Papuan noken craftsmen. This risk will have

an impact on musculoskeletal complaints due to the body position are not ergonomic and carried

out monotonously. The work of weaving the noken is done by sitting and bending the body and

neck. This body position that happened for a long time can caused injury back and neck muscles.

The research used the Rapid Upper Limb Assessment (RULA) as the method. The research

samples consisted of 10 noken craftsmen in Sorong City, Papua. The results found that a high

level of risk with an action score level 5, which needs to be investigated and corrected

immediately. Repairs are carried out based on 3 things such as providing work breaks, facility

layout, and designing work chairs that are tailored to the needs.

Keywords: Noken, Musculoskeletal, Disorders, RULA

Analysis of Optimum Tuned Mass Damper to Reduce Vibration

Response by Using Genetic Algorithm

Dedi Suryati1, Andhika Pratama2, Argian Ardi Prasetya3, Novalio Daratha4 , Indra Agustian5

Email: 1 dedi_suryadi@unib.ac.id, 2 andhika@gmail.com, 3argian@gmail.com, 4ndaratha@unib.ac.id,

5indra.agustian@unib.ac.id

ABSTRACT: The destruction of the structure due to seismic loads is the main focus that supports

researchers to conducted research on the damper system in the structure. At this time, the damper

system developed is a damper system that can be applied to new structures that will be created and

the structures that have been made before. The damper system was called tuned mass damper.

Tuned mass damper is damper system on structure by adding the inertial element, such as mass and

stiffness to the main structure. In this study, modeled of the damper system (tuned mass damper)

was performed on the structure by varied the value of the TMD ratio from the value of the main

structure parameter by using genetic algorithm. Modeling the structural damper system in this study

is to obtain a dynamic response graph of structures without TMD and structures with TMD. As a

result, variations in the value of the TMD ratio with the same percentage values of Md and Kd

obtain a small maximum amplitude with a large percentage reduction value. The value of Md 20%

and Kd 20% shows the smallest maximum amplitude value and the largest reduction percentage.

The value of Md 18% and Kd 12% shows the time to reach the fastest steady state condition in this

study. The aspect of the effective reduction by the system with TMD is by observing the maximum

amplitude value in the main structure which is relatively small.

Keyword : seismic load, damper system (tuned mass damper), maximum amplitude, genetic

algorithm

Comparative study of single and double pass solar PV/T air

collectors integrated with rectangular plate fin absorber

Amrizal1, Yandi Permana H2, Muhammad Irsyad3

Email: 1 amrizal@eng.unila.ac.id, 2 yandi.permana1091@students.unila.ac.id, 3

irsyadmuh@eng.unila.ac.id

ABSTRACT : Solar panel is a device that can convert solar energy into electrical energy.

Nevertheless, not all of the solar energy received on this device can be converted into the electrical

energy and the remainder will be dissipated into thermal energy. If the solar panel is continuously

exposed to the sun, so its temperature will increase and thereby reduce its electrical efficiency. To

deal with the issue, it may combine a PV panel with a thermal collector which is better known as a

PV/T collector. Furthermore, the effects of air flow direction and mass flow rate on the performance

of PV/T air collectors are extensively analyzed. Single and double pass collectors with the

rectangular plate fin absorber were attached back of the PV panel. They were tested using a solar

simulator with various air mass flow rate ranges from 0.01-0.05 kg/s. The results show that the use

of double pass PV/T air collector increase electrical efficiency compared with the single pass one.

The highest values obtained from both thermal and electrical efficiency with the mass flow rate of

0.048 kg/s are found to be 73.23% and 10.16% respectively.

Keyword : Single, double, pass, PV/T, air, collectors

Challenges in Operation and Maintenance of Low-Voltage

Networks Owned by A Medium-Voltage Customer in

Indonesia (Case Study: University of Bengkulu)

Novalio Daratha1, Afriyastuti Herawati1, Ika Novia Anggraini1, M. Khairul Amri

Rosa1, Agus Nuramal2, Mukhlis Islam2, and Yudi Setiawan2, Sigit Sudjatmiko2

1 Department of Electrical Engineering, Faculty of Engineering, The University of

Bengkulu, Jl. W.R. Supratman, Kandang Limun, Bengkulu 38371, Indonesia

2 The University of Bengkulu, Jl. W.R. Supratman, Kandang Limun, Bengkulu 38371,

Indonesia

*Email: ndaratha@unib.ac.id

Abstract. This paper reports challenges in operation of Low-Voltage (LV) networks experienced

by a medium-voltage (MV) Customer. The customer must operate four LV networks and 58

buildings. It faces many challenges related to operation of LV networks.These challenges are

categorized into three type based on the proximity to asset management, behavior of the networks

and their users, and characteristics of natural and built environment. LV networks are mainly

owned and operated by a utility not an MV customers. Hence, publications from the perspective

of a customer are very limited. This paper lists some of these challenges and possible solutions

available in the literature.

Keywords: Low Voltage Distribution Network, Assets Management, Single Line Diagram,

Energy Consumption Forecasting, Phase Balancing

Realtime Obstacle Detection Based On Raspberry

Pi 3 Using Hough Transform Method

1Tiya Muthia Department of Electrical Engineering

University of Lampung

Bandar Lampung, Indonesia

tiyamuthia7@gmail.com

4Sri Ratna Sulistiyanti

Department of Electrical Engineering

University of Lampung

Bandar Lampung, Indonesia

sr_sulistiyanti@eng.unila.ac.id

2Haedar Aziz Mahmud

Department of Electrical Engineering

University of Lampung

Bandar Lampung, Indonesia

haedarazizmahmud@gmail,com

5Sri Purwiyanti Department of Electrical Engineering

University of Lampung

Bandar Lampung, Indonesia

sri.purwiyanti@eng.unila.ac.id

3F.X. Arinto Setyawan Department of Electrical Engineering

University of Lampung

Bandar Lampung, Indonesia

fx.arinto@eng.unila.ac.id

Abstract—The development of digital image processing technology which is growing rapidly is expected to facilitate human life in

various aspects of life. This study aims to produce and analyze a tool that is able to detect the presence of a Obstacle in real-time using the

Python programming language version

3.5.3 and the OpenCV library version 3.4.4 with image processing. Image processing techniques used to detect Obstacles are using LUV,

Thresholding, Morphology, Contours, and Hough Transform methods. Hough transform is used to detect and count the number of lines

in an image that is processed. This study uses boxes and spheres as objects to determine the presence of obstructions from an image

captured through an Avi format camera. In this study data collection was carried out with an intensity of 0.4 lux, 1.8 lux, 8.8 lux, and 14

lux this was done to determine the appropriate intensity for the system to work effectively. An object can be detected if in an image there is

a broken laser line so that counted 2 or more lines. However, if there is an unbroken line in an image, then the image does not detect a

Obstacle. Good light intensity to detect obstructions is when the light intensity is 0.4 lux with a percentage of success of 100%. The average

time needed for the system to detect a Obstacle is 1.8875 seconds at the start of detection while after detection it requires a delay of 2.33875

seconds.The percentage accuracy of the distance calculation with the distance when data collection is above 96.56%.

Keywords—Line laser, Image Processing, Obstacle Detection, Real-time

Design of Dynamic Evolution Control For Maximum Power Point

Tracking Techniques In Solar Photovoltaic Systems

Ahmad Saudi Samosir, Fahrur Riza Priyana and Dekpride Despa

Lampung University

Abstract : This paper presents a design of Dynamic Evolution Control for

Maximum Power Point Tracking Techniques In Solar Photovoltaic Systems. An

approach for synthesis of converter controller based on dynamic evolution control

theory presented. In order to embed the MPPT algorithm to the converter

controller, a simple analysis of non-linear equation models of the converter is used.

Synthesis of MPPT controller based on the dynamic evolution control method is

discussed in detail. Performance of the proposed dynamic evolution control is

verifying through MATLAB-SIMULINK simulation system.

The Proof-of-Concept of Green Cooling Production with a Solar-

Assisted Adsorption Cycle Prototype

Nyoman Sugiartha

Email: sugiartha@pnb.ac.id

ABSTRACT : The adsorption cycle is a reversible solid-gas process of adsorbent and

refrigerant, whichrequires thermal energy as the primary driver to gain a cooling effect. Solar

energy is a promising heat source for the adsorptive cycle as its nature is clean, free and

renewable. This paper presents a developed prototype as a proof-of-concept of the solar-driven

adsorption cycle for cooling production with no demanded electricity. The prototype worked

intermittently and the cooling effect produced during the night-time. The main components of

the prototype composed of an adsorber/collector, a condenser, and an evaporator. The

adsorber/collector was a greenhouse box type. The air-cooled condenser used a natural airflow.

The evaporator was located inside the cold box. The prototype employed an environmentally

friendly working pair, i.e., the adsorbent of activated carbon and the refrigerant of ethanol. The run

test of the prototype was conducted outdoor with the sun exposure. The results show that the

cooling process occurs on the evaporator surface and the surrounding air in the cold box with the

lowest temperatures are at 16.2 ⁰C and 18.7 ⁰C, respectively. Furthermore, the developed

prototype can contribute to green energy innovation for food chain applications, such as post-

harvest agricultural products storage.

Keyword : solar energy, adsorption cycle, cooling, intermittent

Vibration Analysis of Composite Internal Door Panel of a Car using FFT

Analyzer

Ramesh V. Deshmukh

Late G. N. Sapkal College of Engineering,

Savitribai Phule Pune University, India

deshmukh.ramesh78@gmail.com

Tushar. Y. Badgujar

Late G. N. Sapkal College of Engineering,

Savitribai Phule Pune University, India

tybadgujar@gmail.com

Abstract—Present research investigates the mechanical conduct and vibration examination of

bamboo fiber-based polymer composite bar structures. Bamboo fiber is used for some

applications because of light weight, short development cycle and high accessibility. In this

work, the bamboo fiber composite material is used as internal door panel of a car and the static

structural Finite Element Analysis (FEA) of the same is performed. The objective of the present

study is to develop a suitable model to conduct a static structural analysis and compare the

performance of Bamboo fibre material with existing materials of internal door panel. CATIA

software is used to model the internal car door panel, while FEA is performed using ANSYS

Workbench 19.0. The finding of the present study is experimentally validated using FFT

analyzer.

Keywords— Bamboo fiber, Door panel, Equivalent stress, Finite Element analysis, FFT

analyzer.

Optimization Of X-Ray Parameter Monitor Wireless System

Based On Internet Of Things

A.B. Triani 1, S. Budiyanto2, A. Adriansyah3, and M. Alaydrus4

1,2,3,4 Department of Electrical Engineering, Faculty of Engineering, Universitas Mercu

Buana, Jakarta, Indonesia

Email : sbudiyanto@mercubuana.ac.id

Abstract. The purpose of this research is to develop a non-invasive x-ray suitability test device

with an internet of things based monitoring system as an interface connection. The development

in question is the addition of a graphical user interface to the x-ray suitability test prototype

design, in the form of an application using internet of things technology. Testing is done by

measuring the value of the kilovolt and millisecond parameters on the general x-ray. The result

data will be compared with the x-ray calibrator reference value. The average of percentage error

voltage and time value is almost 99.50 %. The average of percentage accuracy voltage and time

value not less than 3%. It is generally concluded that this equipment has good results from the

tested calibrator results.

Keywords: x-ray suitability test, Internet of Things (IoT), development software.

Logistics Service Process and Attribute in Container Shipping

Companies

Yeni Sumantri1*

1 Department of Industrial Engineering, Faculty of Engineering, Universitas

Brawijaya, Jalan MT. Haryono No. 167 Malang 65145, Indonesia

*Email: yeni@ub.ac.id

Abstract. The success of container shipping companies in operating their business is one of the

driving factors for the economy in maritime countries. Studies on logistics service processes and

attributes in this industrial sector are critical and necessary. However, there are not many studies

that address this topic. So this study is directed to investigate the container shipping industry

sector. Specifically, this study aims to investigate the flow of documents in the export and import

process, assess the logistics service attribute of container shipping companies, and investigate

the constraints faced by the industrial sector. This research takes a case study in East Java because

this region has many container shipping companies. This study was conducted through a series

of observations in the field, distributing questionnaires, and in-depth interviews with related

stakeholders. From the results of the study conducted, it is found that there are nine logistics

service attributes that are considered important by container shipping company customers,

including 1) reliability of transportation facilities; 2) customer clearance; 3) tracking and tracing;

4) punctuality; 5) speed of service; 6) condition of goods; 7) responsiveness; 8) coverage of

services; 9) cost of services. From the nine logistics service attributes that are considered

necessary, the attributes that need to be prioritized for improvement are 1) speed of service; 2)

responsiveness; and 3) coverage of services. In carrying out the shipping process, container

shipping companies have several obstacles, including 1) lack of coordination between the

container shipping company and related parties; 2) the occurrence of delays in document

processing; 3) the time of arrival of the ship is less precise than the estimated time of arrival of

the ship; 4) some items do not match the documents. The output of this study is used as an

evaluation material for the container shipping industry sector.

Keywords: Logistics Service Process, Logistics Service Attribute, Container Shipping Company

Obtaining functional gradient coatings based on Al2O3 by

detonation spraying

B K Rakhadilov1,2, Zh B Sagdoldina1, R S Kozhanova2 , M K Dautbaev2 and

M Maulet1,*

1 Scientific research center «Surface engineering and tribology», Non-profit limited

company «Sarsen Amanzholov East Kazakhstan University», 30 Gvardeiskoi divisii

No. 34, Ust-Kamenogorsk 070020, Kazakhstan

2 PlasmaScience LLP, Serikbaeva No.37, Ust-Kamenogorsk 070010, Kazakhstan

*Email: maulet_meruert@mail.ru

Abstract. The article deals with the phase composition and hardness of Al2O3 coatings obtained

by detonation spraying. It was found that a decrease in the delay time between shots is leading

to an increase in the hardness and elastic module of Al2O3 coatings. It was found based on X-ray

diffraction analysis that the main reason for the increase in hardness with a decreasing in the

delay time between shots is associated with increases in the volume fraction of α- Al2O3 phase.

The studies of X-ray diffraction presented that the highest phase content is achieved when the

coatings are formed with a delay time between shots of 0.25 sec. It was found that increase in the

volume fraction of the α-Al2O3 phase is caused by the secondary recrystallization γ → α, which

occurs due to the heating of particles during coating formation, i.e. due to increase in temperature above 1100 ºС in single spots of the coating when they are put each other.

Keywords: detonation spraying, aluminum oxide, coating.

Concentration profile and water level effect to the evaporation

using a diffusion approach in spent nuclear fuel storage pool

T Sundari1,2,* and A Wahid1

1 Sustainable Energy Research Group, Chemical Engineering Department, Faculty of

Engineering, Universitas Indonesia, Jl. Margonda Raya, Pondok Cina, Kecamatan

Beji, Kota Depok, Jawa Barat 16424, Indonesia

2 Center for Radioactive Waste Technology, National Nuclear Energy Agency of

Indonesia (BATAN), Gd. 50 Kawasan Puspiptek Serpong, Tangerang Selatan 15310,

Indonesia

*Email: titikbatan@gmail.com

Abstract. This paper demonstrates steady state diffusion of water-air interface in a spent nuclear

storage pool. A numerical method, 4th order Runge-Kutta was used to describe the concentration

profile of water and air over a spent nuclear fuel storage pool column to the top of the pool. A

prediction of water evaporation rate then can be explained as a diffusion model through a

stagnant gas film. Effect of the water level can be explained then. For various distance of the

water to the pool top at constant water temperature and constant air temperature shows that

evaporation rate is decreasing while distance of the water to the pool top is increasing. The closer

of liquid-water surface to the gas-air flow, the greater evaporation rate that occurs. This approach

can be applied in spent nuclear storage pool which has an abundant amount of water, the water

temperature is remaining constant by operation of water-cooling system, the air temperature,

pressure and relative humidity are remaining constant by operation of ventilation and air

conditioning (VAC) system that those conditions are stated as normal operation.

Keywords: Concentration profile, water level effect, evaporation, spent nuclear fuel

Identifying Association between Fire Hotspots Distribution

and PM10 during 2019 peatland fire episode in South Sumatra

Province, Indonesia

N K Sari1*, R Putra1, T K Nufutomo 1, Y Lisafitri 1 and A Zurfi 1

1 Environmental Engineering Study Program, Institut Teknologi Sumatera, Jalan

Terusan Ryacudu, Desa Way Hui, Kecamatan Jatiagung, South Lampung 35365,

Indonesia

*Email: novi.sari@tl.itera.ac.id

Abstract. Exposure to air pollution from peatlands fires affects to serious problems. Peatland

fires occurred frequently and emitted particulates in some areas in Indonesia, such as South

Sumatra Province. Fire hotspots were commonly detected in several areas, notably during the dry season. Objective this study aims to elaborate on the association between fire hotspot and

PM10 spatially and its probability based on PM10 concentration during the peatland fire episode

(June to October 2019). The PM10 concentration, meteorological data (wind direction and wind

speed), and fire hotspots data had been collected. To address fire hotspot distribution from

peatlands fire and large scale of wind direction in South Sumatra, the geospatial analysis was

used meanwhile metrological and PM10 concentration data were analyzed using RStudio by

windrose and CBPF method. The provided PM10 concentration data had violated national

ambient air quality standards for 11 days while the fire hotspots area was distributed dominantly in OKI (Ogan Komering Ilir) Regency. CBPF result and spatial analysis were the most probable

sources likely coming from South East to East direction, which was predicted from OKI Regency

with >50% of total hotspots area. The study shows a good probability (0.6) that the prediction of

fire hotspots in OKI Regency contributed spatially and statistically to PM10 concentration for

receptor location in Palembang City.

Keywords: Peatland Fire, PM10, Fire Hotspots, South Sumatra Province.

The effect of the nutritional of TEM (Tauge Extract Media)

and Conwy on increase protein and carbohydrate in

microalgaes Tetraselmis chuii contents

N A Bangun1and E Purba2*, 1, 2 Chemical Engineering Lampung University, Jl. Prof. Dr. Soemantri Brojonegoro

No. 1, Gedong Meneng, Bandarlampung, Indonesia, 35415

*E-mail: elida.purba@eng. unila.ac.id

Abstract.This research is about increasing protein and carbohydrate in microalgae

Tetraselmis chuii by adding bean sprout (Tauge) Extract Media (TEM) and Conwy.

Culturing was carried out on a photobioreactor with a size of 3 liters of culture and

controlling with 2 liter/minute CO2 gas. Light intensity was kept constant at 4000 lux.

Microalgae were cultured with the ratio of seeds and seawater of 1: 4 with variations in

the ratio of TEM: Conwy, namely 3:0, 1.5:1.5 and 0:3. Culturing was carried out for 5

days where the cell density was counted every day and then harvesting on the fifth day.

The results showed that the 0: 3 ratio produced the highest protein content of 18.46%

while the 1.5: 1.5 ratio resulted in the highest carbohydrate content of 19.51%.

Keywords:Tetraselmis chuii, nutrient ratio, TEM, Conwy, Protein, Carbohydrate.