Faculty of science

Mohamed H. Sherif

Journal of American Science: 2010, 6, (11) Rank: D

CHEMICAL STUDIES ON 3,6-DICHLOROPYRIDAZINE

Mohamed H. Sherif, Gamal A. Ahmed, Adel A. Elbahnasawy and Enian O.

Helal

Department of Chemistry, Faculty of Science, Zagazig University, Egypt ABSTRACT Reaction of 3.6-dichloropyridazine (1) with acid hydrazides, p-toluene sulfonylhydrazine, anthranilic acid derivatives and ammonium hydroxide afforded the compounds (2a,b), (3), (4a,b) and (5) respectively. Compound (5) reacted with aromatic aldehydes yielded the Shiff s bases (6) and (7). Compound (6) Reacted with anthranilic acid derivatives and gave (8). Also, compound (1) easily reacted with 2-chlorobenzylamine, sodium azide and thioscmicarbazide afforded the compounds (9), (10) and (11) respectively. Keywords: 3,6-dichloropyridazine; acid hydrazides; p-toluene sulfonylhydrazine; anthranilic acid derivative; ammonium hydroxide

Journal of American Science 2010, 6(6) Rank: D

SYNTHESIS AND REACTIONS OF SOME NEW PYRIMIDINE THIONES

Abdielghani, E.; Sherif, M., H.; Assy, M., G. and Morsi, Gh., INI. Department of Chemistry Faculty of Science, Zagazig University

ABSTRACT The addition of cyanomethylene derivative 2 to aroyl isothiocyanate 1 afforded mercaptopyrimidine derivative 5. Mercaptopyrimidine 11 was prepared and transformed upon alkylation with chloroacetamide to thienopyrimidine 13. Oxidation of 11 using I2/AcOH yielded the disulphide 14, while oxidation using H2O2/AcOH gave pyrimidine derivative 15. Reaction of aldehydes with aminothiouracil 16 yielded 5-aroyl-2,8-dithioxo-2,3,5,8,9,10-hexahydropyrimido[5',4':5,6]pyrido[2,3-(/|pyrimidine derivatives 19a,b. Addition of 16 to chalcone afforded pyridopyrimidine 20. Reaction of urea, 1-naphthaldehyde and aminothiouracil afforded pyrimidopyrimidine 21. Reaction of 16 with NH4SCN afforded compound 22 that oxidized to bis-isothiazolopyrimidine bisulphide 23. [Journal of American Science 2010; 6 (6): 10-15]. (ISSN: 1545-1003). KEY WORDS: mercaptopyrimidine, oxazine, thienopyrimidine, pyrimidine, pyridopyrimidine, pyrimidopyrimidine and isothiazolopyrimidine. *

Australian J. of Basic and Applied Sciences, 2010, 4(6): 1376-1382 Rank: D

Synthesis and Characterization of Waterborne Epoxy Resins for Coating Application

1A.M. Motawie, 2M.H. Sherif, 1M.M. Badr, 2M.S. Amer and 2A.S. Shehata

1Egyptian Petroleum Research Institute; Petrochemicals Department, Cairo, Egypt

2Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt. ABSTRACT Mixtures of polyethylene glycol 4000 (PEG) and bisphenol A (BPA) with differentratios (1:1, 2:1, and 1:2) were reacted with epichlorohydrin (ECH) to give uglycidylether epoxy copolymers (DGECBAPEG). Diglycidylether of polyethylene glycol (DGEPEG) and diglycidylether of pisphenol A (DGEBA) epoxy resins were also synthesized for comparison. The prepared epoxy resins were characterized by FTIR and measuring the hydroxyl value and epoxy group content. Epilink 701 waterborne curing agent is used for hardening the water soluble (water based) epoxy resins, where Epikure 3115-X-70 polyamide curing agent is used for hardening the water insoluble (solvent based) epoxy resins. The curing process of the epoxy resins were applied and evaluated as coating materials. The prepared waterborne epoxy resins give good metal coating properties. Key word: polyethylene waterborne epoxy resin, polyethylene glycol 4000, bisphenol A, DGEBA,

European journal of Medicinal Chemistry, (2010) 45:5935-5942 Rank: A

Antiarrhythmic, serotonin antagonist and antianxiety activities of novel substituted thiophene derivatives synthesized from 2-amino-

4,5,6,7-tetrah\ N-phenylbenzo[b]thiophene-3-carboxamide Abd El-Galil E. Amra-*, Mohamed H. Sherifb, Mohamed G. Assyb, Mohamed A.

Al-0mara, Islam 1 aDepartment of Pharmaceutical Chemistry, College of Pharmacy, King Sand University, El-Tahrir, St.,

Dokki, Riyadh 11451, Saudi Arabia b Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT A series of novel thiophene derivatives 3–17 were synthesized by initial reactions of 2-amino-4,5,6,7-tetrahydro-N-phenylbenzo[b]thiophene-3-carboxamide 1 and 2-amino-4,5,6,7-tetrahydro-benzo[b]thiophene-3-carbonitrile 7 with different organic reagents. The structures of newly synthesized compounds were confirmed by IR, 1H NMR, MS spectral data and elemental analysis. Initially the acute toxicity of the compounds was assayed via the determination of their LD50. All the compounds were screened for their antiarrhythmic, serotonin antagonist and antianexiety activities and they showed high activity compared with procaine amide, lidocaine, diazepam and

buspirone as positive controls. The detailed synthesis, spectroscopic data, LD50 and pharmacological activities of the synthesized compounds were reported.

ABD EL-AZIZ A. DIAB

Biosciences, Biotechnology Research AsiaVol. 7(1), 139-151 (2010) Rank D

Possible ameliorative role of some compounds on the side effects of Avandia (Drug)

Abd El-Aziz A. Diab1, Mansour H. Zahra1, Ahmed A. Hendawy1,Samih, I. El-

Dahmy2* And Reham Z. Hamza2

1Department of Zoology, Faculty of Science, Zagazig University, Cairo (Egypt). 2Department of Pharmacognosy and Medicinal Plants, Faculty of Pharmacy,

Zagazig University, (Egypt).

ABSTRACT The present study was carried out to evaluate the hypoglycemic effect of

Avandia, Nigella sativa, Silymarin each alone and the combination of Avandia with either Nigella sativa or Silymarin In order to get the best combination to avoid the possible side effects produced by Avandia. This was done through studying the effect of the test plant drugs and their combination on serum glucose, insulin , some liver and kidney function parameters .seven groups of adult male rats each of 10 (200-250 gm / b.wt) were used in this study. Hyperglycemia was induced in six groups of rats. Whereas, the seventh group was left as normal control group. All treatments were given orally daily for successive 28 days .The first group was left without treatment and kept as STZ diabetic. The 2nd group was administered Avandia (0.58mg/100gm.b.wt), The third group was given Nigella sativa(0.25gm/ 100gm.b.wt) , the 4th group was given Silymarin (50mg/100gm.b.wt), The 6thand 7th groups were administered the combination of Avandia with either Nigella sativa or Silymarin respectively in the same recommended doses. Blood samples were collected after 1 st, 2nd, 3rd and 4th week post drug administration. Serum was separated and used for determination of various variables. The results showed that Avandia afforded a marked increase in serum ALT, AST, LDH activities, Serum urea, Uric acid and creatinine as well a significant elevation in blood glucose level and significant decrease in serum insulin level. Treatment of diabetic rats with various treatments elicited a marked decrease in serum ALT,AST,LDH, Urea, Uric acid and creatinine as well as a marked decrease and increase in blood glucose and serum insulin respectively when compared with diabetic non treated group The best results was obtained with the combination of Avandia+ Silymarin on blood sugar and insulin levels. Key word: Nigella sativa, Avandia and Anti diabetic drug.

Sadeek A. Sadeek

Journal of Molecular Structure, (2010) 981: 130-138 Rank:B

Preparation, structure and microbial evaluation of metal complexes second generation quinolone antibacterial drug lomefloxaein

Sadeek A. Sadeek*, Walaa H. El-Shwiniy

Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt ABSTRACT Lomefloxacinate of Y(III), Zr(IV) and U(VI) were isolated as solids with the general formula; [Y(LFX)2Cl2]Cl·12H2O, [ZrO(LFX)2Cl]Cl·15H2O and [UO2(LFX)3](NO3)2·4H2O. The new synthesized complexes were characterized with physicochemical and diverse spectroscopic techniques (IR, UV–Vis. and 1H NMR spectroscopies) as well as thermal analyses. In these complexes lomefloxacin act as bidentate ligand bound to the metal ions through the pyridone oxygen and one carboxylate oxygen. The kinetic parameters of thermogravimetric (TGA) and its differential (DTG), such as entropy of activation, activation energy, enthalpy of activation and Gibbs free energy evaluated by using Coats–Redfern and Horowitz–Metzger equations for free lomefloxacin and three complexes were carried out. The bond stretching force constant and length of the UO bond for the [UO2(LFX)3](NO3)2·4H2O complex were calculated. The antimicrobial activity of lomefloxacin and its metal complexes was tested against different bacterial species, such as Staphylococcus aureus (S. aureus), Escherichia coli (E. coli) and Pseudomonas aeruginosa (P. aeruginosa) as Gram-positive and Gram-negative bacterial species and also against two species of antifungal, penicillium (P. rotatum) and trichoderma (T. sp.). The three complexes are of a good action against three bacterial species but the Y(III) complex exhibit excellent activity against Pseudomonas aeruginosa (P. aeruginosa), when compared to the free lomefloxacin.. Keywords:LFX, TGA, UV-Vis. Spectra, Infrared, Kinetic parameters,HNMK

Journal of Coordination Chemistry, 2010, 63(190, 3471-3482 Rank C

Metal complexes of the third generation quinolone antibacterial drug

sparfloxacin: preparation, structure, andmicrobial evaluation

SADEEK A. SADEEK* and WALAA H. EL-SHWINIY Department of Chemistry. Faculty of Science, Zagazig University, Zagazig, Egypt

The interactions of yttrium chloride, zirconium chloride, and uranium nitrate with sparlloxacin (SPAR) in ethanoK methanol, and acetone were studied. The isolated solid complexes were characterized by elemental analysis, infrared, 'H-NMR and electronic spectra, and thermo-gravimetric analysis. The results support the formation of [Y(SPAR)2C12]C1 • 12H2O, |ZrO(SPAR):C)]Cl • 15H2O, and [UO2(SPAR)31(NO3)2 • 5H2O. Infrared spectra of the isolated solid complexes indicate that SPAR is bidenlate through the ring carbonyl oxygen and one oxygen of earboxylate. The calculated bond length and force constant, /;1(U=O), in the uranyl complex are 1.747 A and 655.29 Nm"1, respectively. The antimicrobial activities of the ligand and metal complexes have been tested against bacteria Stciphylococcus aureus (S. ciureus), Lschcrichia coll (/:.coli] and Pseudomonas aeruginosa (P. ueniginosa) and fungi Penicilliuni roiunini (P. rofaiuni) and Trichodenna sp., showing that the complexes exhibit higher antibacterial activity than SPAR.

AVniwr/.v; SPAR; 1R spectra; Thermal analyses; 'H-NMR; UV reflection; Biological activity

Walaa H. El-Shwiniy

Journal of Molecular Structure (2010) 977: 243-253 Rank B

Metal complexes of the fourth generation quinolone antimicrobial drug gatifloxacin: Synthesis, structure and biological evaluation

Sacleek A. Sadeek*, Walaa H. El-Shwiniy

Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt ABSTRACT Three metal complexes of the fourth generation quinolone antimicrobial agent gatifloxacin (CFI.X) will Y(UI), Zr(IV) and U(VI) have been prepared and characterized with physicochemical and spectroscopu techniques. In these complexes, gatifloxacin acts as a bidentate deprotonatcd ligand bound to the mcia through the ketone oxygen and a carboxylato oxygen. The complexes are six-coordinated with clistortec octahedral geometry. The kinetic parameters for gatifloxacin and the three prepared complexes have been evaluated from TGA curves by using Coats-Redfern (CR) and Horowit/.-lVletzeger (MM) methods The calculated bond length and force constant, F(U—0), for the U02 bond in uranyl complex art 1.7522 A and 639.46 N m \ The antimicrobial activity of the complexes has been tested against microorganisms, three bacteria species, such as Staphylococcus aureus (S. aureus), Escherichia coll (E. co/i) and Pseuclomonas aeruginosc (P. aeruginosa) and two fungi species, penicillium (P. rotatum] and irichoderma (T. sp.), showing that the\ exhibit higher activity than free ligand. Keywords:GFLX, UV, H NMR, Kinetic data, TGA, Antimicrobial activity

Latvijas kimijaszurnals2010, Nr. 2, 3. Rank D

SYNTHESIS, CHARACTERIZATION AND ANTIBACTERIAL ACTIVITY OF NEW Y(III) AND Zr(IV) CIPROFLOXACIN

COMPLEXES S.A. Sadeek, A.M. El-Didamoiiy, W.H. El-Shwiniy

Department of Chemistry, Faculty of Science, Zagazig Unversity, Zagazig, fcgypt Ciprofloxacin (CIP) is a member of the second generation quinolone antibiotics family. It is a broad-spectrum antibiotic that is active against both Gram-positive and Gram-negative bacteria. It functions by inhibiting DNA gyrase, a bacterial type 11 topoiso rrerase an d topo BO rrerase IV, wh ch is an enzyme necessary to separate replicated DNA by inhibiting cell division [ 1]. Quinolones, a commonly used term for the quinolone carboxylic acids or 4-quinoloncs, are a group of synthetic antibacterial agents containing 4-oxo-l/l-dihydroquinoline skeleton (Formula I) [2], They can act as antibacterial drugs and the

addition of fluorine atom to the original quinolone antibiotic compounds, usually at position 7, yields a new class of drugs, the fluoroquinolones, which have a broader antimicrobial spectrum and improved pharmacokinetic properties [3].

Wael A. Zordok

Journal of Molecular Structure: Theochem, (2010) 951: 14-20 Rank:C

A molecular orbital treatment of piroxicam and its M2+-complexes: The change of the drug configuration in a time of bond formation

Rafie H. Abu-Eittaha'*, Wael A. Zordok b

a Department of Chemistry, Faculty of Science, Cairo University, Giza, Egypt b Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT Piroxicam is a non-steroidal anti-inflammatory and anti-arthritic drug. The global structure of piroxicam molecule H2PIR (4-hydroxy-2-methyl-N-2-pyridyl-2H-benzothiazine-3-carboxamide 1,1-dioxide) is behind the remarkable biological activity of the drug. The equilibrium geometry of the molecule is investigated by DFT calculations at the B3LYP/6-31G** level of the theory. The pronounced steric effects existing within the molecule create a non-planar structure with a dihedral angle -32.7° between the two units of molecule: substituted pyridine residue and benzothiazine ring. This steric hindrance makes the molecule quite labile and major changes occur in the configuration of the molecule when in presence of metal ions. B3LYP/6-31G** calculations on piroxicam and its metal-ion complexes [M(H2PIR)2]2\ M = Ni(II), Cu(II) and Zn(II), showed that the geometry of the drug in the free state differs significantly from that in the metal complex. In the time of metal ion-drug bond formation the drug switches-on from the closed structure (equilibrium geometry) to the open one. Keywords:Piroxicam, Piroxicam molecular orbital, Piroxicam structure

M. Elereki

Quarterly j. of engineering geology and hydrogeology, 2010, 43: 171-184 Rank B

Application of resistivity method In environmental studyof the

appearance of soil water In the central part ofTenth of Ramadan City, Egypt

M. Elerekra, M.M. Gadallaha2, K.S. Gemallb'* & M. Attwab

aGeology Department, Faculty of Science, Zagazig University, Zagazig, Egypt bAlexandria University. Faculty of Science. Damanhur. Alexandria, Egypt

2Present address: King Abdulaziz University, Jeddah, Saudi Arabia 'Present address: Geology Department. University of Saskatchewan, Saskatoon. SK, S7N 5E2. Canada

*Leibniz Institute for Applied Geophysics, LIAG, Hannover, Germany

ABSTRACT Tenth of Ramadan City is an important Industrial and urban area in Egypt. The appearance of soil water seepages in the central part of the city represents a great environmental problem. Direct current resistivity measurements in the form of ID and 2D surveys were carried out to show the relation between this problem and both lateral and vertical variations of a clay layer that may act as a geological barrier in the area. Twenty-seven Schlumberger sounding points were distributed over a grid with unequal spacing depending on the civil constructions and topography of the area. These sounding points were quantitatively interpreted to obtain the subsurface layer distribution and define the expected clay barrier. Five 2D resistivity profiles were measured along some interpreted anomalies from the 1D sounding survey. A Wenner array was selected because of its sensitivity in detecting vertical changes in the subsurface resistivity. The results of the resistivity inversion indicate that the subsurface resistivity can change rapidly within a short distance. However, from the resulting models it was possible to correlate the resistivity ranges with subsurface geological data obtained from shallow boreholes. This correlation shows the importance of 2D resistivity imaging for mapping of the clay barrier layer.

Ayman A. Gouda

Arabian Journal of Chemistry (2010) 3, 159-165 Rank D

Copper(II)-neocuproine reagent for spectrophotometric determination of captopril in pure form ,\ () and pharmaceutical

formulations

Ayman A. Gouda a'*, Alaa S. Amin Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT A simple, rapid, sensitive and accurate spectrophotometric method for the determination of captopril in pure form and pharmaceutical formulations is developed. The procedure is based on the reaction of copper(II) with captopril in the presence of neocuprome (NC) (2.9-dimethyl-l,10-phenanthrolme) reagent in acetate buffer at pH 5.0. Copper(Il) is reduced easily by captopril to Cu(I)- neocuprome complex, which shows an absorption maximum at 448 nm. Beer's law was obeyed in the concentration range 0.3-3.0 u.g mL"1 with a minimum detection limit (LOD) of 0.039 ug mL-l and a quantification limit (LOQ) of 0.129 ug mL-1. For more accurate results, Ring-bom optimum concentration ranges was 0.5-2.7 ugmL-1. The apparent molar absorbtivity and Sandell sensitivity were calculated. The validity of the proposed method was tested by analyzing the pure and pharmaceutical formulations and compared well with those obtained by the official method and demonstrated good accuracy and precision. KEYWORDS Captopril; Ncocuproinc; Spcctrophotometry; Pharmaceutical formulations

Arabian Journal of Chemistry (2010) 3, 33-38 Rank D

Kinetic spectrophotometric determination of hyoscine butylbromide

in pure form and in pharmaceutical formulations ;

Ayman A. Gouda Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT A simple and sensitive kinetic method was described for the determination of hyoscine butylbromide in pharmaceutical preparations. The method is based upon a kinetic investigation ot the oxidation reaction of the drug with alkaline potassium permanganate at room temperature for a fixed time of LSmin. The absorbance of the colored manganate ion was measured at. 610 nm. The absorbance-concentration plot was rectilinear over the range of 1.0-10 iig mL"' (r = 0.9999) and detection limit of 0.092 ug mL"1. The concentration of hyoscine butylbromide was calculated using the corresponding calibration equation for the fixed-time method. The determination of hyoscine butylbromide by the fixed-concentration and rate constant methods is also feasible with the calibration equations obtained but the fixed-time method has been found to be more applicable. The different experimental parameters affecting the development and stability of the colors were carefully studied and optimized. The proposed method was applied to the determination of hyoscine butylbromide in pharmaceutical formulations. The results obtained were in good agreement with those obtained using the official British Pharmacopeial method (2004). KEYWORDS Kinetic determination; Hyoscine butylbromide; Potassium permanganate; Pharmaceutical analysis

Ragaa El Sheikh

Chemical Industry & Chemical Engine Rank D

SENSITIVE SPECTROPHOTOMETRIC METHODS FOR DETERMINATION OF SOME ORGANOPHOSPHORUS PESTI-

CIDES IN VEGETABLE SAMPLES Ayman A. Gouda1, Alaas. Amin2, Ragaa El Sheikh1 and Magda A. Akl3

1Chemistry Department, Faculty ofScience, Zagazig University,Zagazig, Egypt 2Chemistry Department, Faculty ofScience, Benha University,Benha, Egypt

3Chemistry Department, Faculty ofScience, Mansoura University,Mansoura, Egypt

Three rapid, simple, reproducible and sensitive spectrophotomethc methods (A, B and C) are described for the determination of two organophosphorus pesticides, (malathion and dimethoate) in formulations and vegetable samples. The methods A and B involve the addition of an excess of Ce'i into sulphuric acid medium and the determination of the un reacted oxidant by decreasing the red color of chromotrope 2R (C2R) at a suitable Amax = 528 nm for method A, or a decrease in the orange pink

color of rhodamine 6G (Rh6G) at a suitable /lmajf = = 525 nm. The method C is based on the oxidation of malathion or dimethoate with the slight excess of N-bromosuccinimide (NBS) and the determination of un re acted oxidant by reacting it with amaranth dye (AM) in hydrochloric acid medium at a suitable kmax = 520 nm. A regression analysis of Beer-Lambert plots showed a good correlation in the concentration range of 0.1-4.2 µg mL-1. The apparent molar absorptivity, Sandell sensitivity, the detection and quantification limits were calculated. For more accurate analysis, Ringbom optimum concentration ranges are 0.25-4.0 µg mC1. The developed methods were successfully applied to the determination of malathion, and dimethoate in their formulations and environmental vegetable samples. Key words: spectrophotometry; malathion; dimethoate; eerie sulfate; N-bromosuccinimide; vegetable samples.

Abeer El-Kenawy

Int. J Earth Sci. (Geol. Rundsch.):(2010) 99:1427-1436 Rank A

Integrated geoelectrical survey for groundwater and shallow

subsurface evaluation: case study at Siliyin spring, El-Fayoum, Egypt

M. Metwaly (K3) • G. El-Qady - U. Massoud National Research Institute of Astronomy and Geophysics, Helwan, Cairo, Egypt

e-mail: mmetwaly70@yahoo.com

M. Metwaly • J. Matsushima Geosystem Department, Graduate School of Engineering, Tokyo University, Tokyo,

Japan A. El-Kenawy

Geology Department, Faculty of Science, Zagazig University, Zagazig,Egypt M. Metwaly

Al-Quwy'yia Community College, King Saud University,Riyadh, Saudi Arabia, N. Al-Arifi Geology Department, College of Science, King Saud University,

Riyadh, Saudi Arabia ABSTRACT Siliyin spring is one of the many natural fresh water springs in the Western Desert of Egypt. It is located at the central part of El-Fayoum Delta, which is a potential place for urban developments and touristic activities. Integrated geoelectrical survey was conducted to facilitate mapping the groundwater resources and the shallow subsurface structures in the area. Twenty-eight transient electromagnetic (TEM) soundings, three vertical electrical soundings (VES) and three electrical resistivity tomography (ERT) profiles were carried out around the Siliyin spring location. The dense cultivation, the rugged topography and the existence of infra- structure in the area hindered acquiring more data. The TEM data were inverted jointly with the VES and ERT, and constrained by available geological information. Based on the inversion results, a set of geoelectrical cross-sections have been constructed. The shallow sand to sandy clay layer that forms the shallow

Sayed Abd El-azeem

Cretaceous Research, 2010, 31, 291-303 Rank: B

Paleogeographic relation of the Egyptian Northern Galala with the Tethys during the Cretaceous Period

Ezat Abd-Elshafy, Sayed Abd El-Azeem

Geology Department, Faculty of Science, Zagazig University, Zagazig, Egypt The present study records eighteen clastic and carbonate microfacies associations within the Cretaceous sediments representing the Malha; Galala, and Adabiya Formations, which are exposed between Khashin Id Galala and Wadi Qjseib areas along the eastern scarp of the Northern Galala Plateau. The lithofacies characters and the fossil content of the Malha Formation (Lower Cretaceous) suggest a probable extended shallow marine environment interrupted by moderate fluvial sedimentation with tectonic stability and moderate energy. The fine elastics and the faunal content of the lowei part of the Galala Formation indicate shallow oscillating sea with much terreginous outlet in a transgrcssive phase with the beginning of the Cenomanian, while the limestones and dolostones of the rest of the Calala Formation and the Adabiya Formation suggest the progression oi the sea during the Turonian. It was an open shelf of moderately deep warm marine conditions of low energy. Integration of the carbonate and the clastic fades analysis with the lithostratigraphic correlation of the Cretaceous sediments through the Southern and the Northern Galala Plateaux exhibited that the First Tethyan flooding had encroached the area through the Aptian-Albian. The second invasion occurred with the beginning of the Cenomanian and continued throughout the Late Cretaceous on the' area of Southern Calala Plateau, which stayed in connection with the Tethys, while the area of Northern Galala Plateau, most probably, had emerged after the Turonian time or the younger Cretaceous ages till Middle Paleocene.

S.A. Mazen

Solid State Communications, 2010, 150: 1719-1724 Rank:B

The conduction mechanism of Cu-Ge ferrite

S. A. Mazen*,A.M.ElTaher Magnetic Semiconductor Laboratory, Physics Department, Faculty cf Science, Zagazig University,

Zagazig, Egypt ABSTRACT The electric conductivity, a (DC and AC), drift mobility and dielectric properties of germanium substituted copper ferrite, with the chemical formula Cu1+xGexFe2_2xO'i (where x = 0.0, 0.05, 0.1, 0.15, 0.2, 0.25 and 0.3), have been studied. Plots of In ϭ T versus 104/T (K) are linear and showed two sloping regions for all values of x except

for the values 0.0 and 0.05, which showed one slope only. The two activation energies around a kink point called Tk were calculated. The electrical conduction in these ferrites is explained on the basis of the hopping mechanism. The values of the charge carrier mobility have been calculated from the experimental values of electrical conductivity which increased exponentially with increasing temperature. Dielectric properties such as dielectric loss tangent tanδ were measured at elevated temperature in the frequency range from 102 to 10fi Hz. The variation of these parameters with temperature is explained qualitatively. An attempt is made to explain the possible mechanism. Keywords:A. Ferrites - B. Cu-Ce ferrites - D. Electrical conductivity

Journal of Alloys and Compounds :.( 2010) 498: 19-25 Rank: B

The conduction mechanism of Cu-Si ferrite

S.A. Mazen*, A.M. El Taher

Magnetic Semiconductor Lab., Physics Department, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT The mixed ferrite Cu1+x Six Fe2_2x 04; with 0 <x<0.3 in step of 0.05 were prepared by standard ceramic techniques. The X-ray analysis confirmed that the compositions are well formed in a single phase. The d.c. and a.c. electrical conductivity as a function of temperature have been studied. The relation Ina vs. T-1 showed two regions with different slopes for all values of x except x = 0.0 showed one slope only. The two activation energies around a kink point called Tk were calculated. The change of the slope at Tk was attributed to a change in the nature of type of conduction mechanism (i.e. from n-type to p-type). The activation energies were greater than 0.3 eV; which clearly suggested that the conduction is due to small polaron model. Keywords:Electrical conductivity, Ferrites, Cu-Si ferrites

Wesam S. Shehab

Journal of chemistry and Chemical Engineering: 2010.4(10) Rank: D.

Synthesis and Antimicrobial Activity of Heterocyclic Compounds Containing Chromene Ring

Enaiat K. Mohamecl and Wesam S. Shehab

Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt ABSTRACT Synthesis ofsome nc\v compounds containing chromene ring are described in this work. They were synthesized in moderate to good ,yield, started with Condensation of 7-hydroxy-4-methyicoumarin (1) with ethyl bromoacetate furnishes ethy-l-2-(4-

miethy l-2-oxo-211-chromen-7-ylox) acetate (2). The structures of all the new compounds were confirmed using IR, 'JI-NMR spectra and micro analysis, selected members of the synthesized compound were screened for antimicrobial activity. They have shown a wide range of activity from one completely inactive compound to medium active ones. Key words: Chromene. Thiazolidine, Oxazolotriazole derivatives, antimicrobial activity.

A. Deeb Chemistry of Heterocyclic Compounds, 2010, 46(2) Rank:C

PYRIDAZINE DERIVATIVES AND RELATED

COMPOUNDS.23*. SYNTHESIS OF 3-SUBSTITUTED PYRAZOLO[3,4-c]PYRIDAZINES AND THEIR APPLICATION

AS DISPERSE DYES

A. Deeb1*, F. Yassin1, N. Ouf1, and W. Shehta1 Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt

Acetylacetone and malononitrile were coupled with diazotized arylamines to give arylazoacetyl-acetones and arylazomalononitriles. When re fluxed with 3-hydrazino-4,5-diphenyl-l H-pyrazolo-[3>4~c]pyridazine in the presence of ethanol/HCl, they yielded the corresponding 3-[4-(arylazo)-3,5-di-methylpyrazol-1 -ylj- and 3-[3,5-diamino-4-(arylazo)pyrazol-l-yl]-4,5-diphenyl-lPI-pyrazolo[3,4-cJpyn-dazine dyes. The dyes were applied to polyester and poly amide fabrics, and their spectral and fastness properties were measured. Keywords: 3-hydrazino-lH-pyrazolo[3,4-c]pyridazine, monoazo dyes, color fastness.

Petroleum Science and technology. 2010, 28,1158-1169 Rank: B.

The Preparation and Characterization of SomeNovel Quaternary

Iminium Salts Based onSchiff-base as a Corrosion Inhibitor M. M. A. El-Sukkary,1 I. Aiad,1 A. Deeb,2 ,M. Y. El-Awady,1 H. M. Armed,1 and

S. M. Shaban1 1Egyptian Petroleum Research Institute, Nasr City, Cairo, Egypt

2Faculty of Science, Chemistry Department, Zagazig University, Zagazig, Egypt ABSTRACT Novel quaternary iminium compounds, namely, N-(4-methoxybenzvlidene)-N-benzyldodecyHminium chloride (Ia), N-(4-methoxybenzylidene)-N-benz.ylhexadecyl iminium chloride (7/J, N-(4-methoxybenzylidene)-N~benzyloctadecyiiminium chloride (Ic), and N-benzylidene-N-benz,yldodecyliminium chloride, were prepared. The surface properties such as surface and interfacial tension, foaming, and emulsifying power of these surfactants were investigated. The surface parameters including critical micelle concentration (CMC), maximum surface excess (rmu\),

minimum surface area (Amin), efficiency (PC20), and effectiveness (Π CMC) were calculated. Free energy of micellization (ΔGu

mic) and adsorption (ΔG°ads) were calculated. Keywords cationic surfactants, corrosion inhibitors, quaternary iminium salts, surface parameters

Ahmed A. Ismaiel

Brazilian J. of microbiology, 41, 1112-1123 Rank: C

SOME OPTIMAL CULTURE CONDITIONS FOR PRODUCTION OE CYCLOSPORIN A BY I'USARIUM ROSEUM

Ahmed A. Ismaiel*, El-Sayed A. El-Sayed, Asmaa A. Mahmoud

Department of Botany, Faculty of Science, Zagazig University, Zagazig, Egypt . ABSTRACT A suitable chemically defined culture medium was selected and some optimal conditions for the production of the highly immunosuppressive compound, cyclosporin A (Cyc A) are reported. Medium of the following composition was favorable for the production of Cyc A by Fusariwn roseiim: glucose, 30; NaNO3, 2; KH2PO4, 1; MgSO4.7H2O, 0.5 and KCL, 0.5 (g/1). Maximum productivity of Cyc A was achieved at pH 6.0 when 50 ml of the fermentation medium/250 ml flask, inoculated with five fungal agar discs (6 mm, diameter) of 7-days old F. roseiim culture after incubation at 30 °C at 120 rpm for 7 clays. Key words: Fusariwn roseiim, Cyclosporin A, Fermentation conditions.

A.M.M. El-Masry

Pigment and resin technology, 39/5,227-282 Rank: B

Water absorption and Ion properties of some derivatives of peroxyacid viscosegrade pulp

A.M.A. Nada

Cellulose and Paper Department, National Research Centre, Giza, Egypt

A.M.M. El-Masry and A.M.M. El-Torky Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt

Yehia E.A. Abd El-Aziz Ministry of Health and Population, Zagazig Laboratory of Nutrition Analysis, Zagazig, Egypt

ABSTRACT Purpose - The purpose of this paper is to study some chemical reactions of viscose grade pulp (alpha cellulose around 96 per cent) prepared by preoxyacetic acid pulping of bagasse for the preparation of some cellulose derivatives. Design/methodology/approach - Viscose grade pulp was prepared by using ecological chemicals. The viscose grade pulp was subjected to some chemical reactions (e.g. carboxymethylation, cyanoethylation and phosphorylation reactions). The pulping and

bleaching which are two important stages involved in the complex process of converting fibrous raw material (bagasse) into viscose grade pulp are also investigated in this paper. Findings - The viscose pulp prepared by peroxyacid pulping of bagasse was subjected to a number of chemical reactions such as: hydrogel and fibrous carboxymethyl cellulose; cyanoethyl cellulose, in which this cyanoethylcellulose (of gel properties) was prepared, the hydrophobic character of the cyanoethylcellulose was changed into hydrophilic character via hydrolysis by NaOH (2.5 per cent w/v) which converts some of the CN groups into COOH; and cellulose phosphate. Infrared spectroscopy of these derivatives was studied. New bands were observed at 3,120, 2,251, 1,200 and 980cm-1 which characterised to groups, respectively. Originality/value - The paper documents the preparation of some cellulose derivatives which have high water absorption and can be used as hydrogel materials such as carboxymethyl and hydrolysed cyanoethyl cellulose and ion exchange properties. Keywords Waste recovery, Vegetable fibres, Wood pulp, Organic compounds, Chemical reactions Paper type Research paper

El-Khadragy

Journal of Applied Sciences Research: 2010: 2(61 6-636) Rank: D

An Integrated Study of Gravity and Magnetic Data on South Sitra Area, WesternDesert, Egypt

Saad, M.I 1, El-Khadragy, A. A.2, Sbabaan, M.M2.and Azab, A.1

1 Egyptian Petroleum Research Institute, Naser City, Cairo 2Geology Department, Faculty of Science, Zagazig University. Egypt

ABSTRACT The potential Held data ( Bouguer gravity and total intensity aeromngnetic maps) parried out in the South-Sitra area had been analyzed and integrated with other Geophysical and geological studies to extract inlbrmntion about the regional subsurface structural and tectonic framework of (he hurried basement rocks, as well us locating promising sites that probably favoring for the hydrocarbon accumulations. The execution of this study was initiated by transformation of the total intensil) aeromagnetic data to the [{educed to Pole (RTF) magnetic map. This followed by applying several transformation techniques and various filtering processes through qualitative and quantitative analyses on both gravity and magnetic data. These techniques include: qualitative interpretation of gravity, total magnetic intensity and KTP magnetic maps. Regional-residual separation was carried out using four methods are: nine-points, least-squares polynomial fitting, second vertical derivative and analytical signal analysis technique. Surface and subsurface statistical trend analysis was applied on both the surface lineaments of Landsal images to identify the surface structural features, and on gravity and magnetic maps to dellne the major subsurface tectonic trends of the buried basement rocks. In addition, depths to the basement rocks were estimated by using three empirical methods. The results of qualitative and quantitative techniques mentioned earlier were integrated together with other geological information to construct a tectonic basement map lor the study area. This map is mainly composed of folded basement rocks of alternated synclinal and anticlinal structures cut across the study area in NNW- SSW and ENI{-\VS\V

directions. It shows that the Abu Gharadig Basin was divided into two sub-basins: North-Abu Gharadig Basin and South- Abu Gharadig Basin separated by Apollonia-Kattania high. Also, the older NNW-SSH tr-cndi'ng structures ((biding and faulting) seem to be intersected by a younger set of E-\V to ENH trending faults, resulted rn large vertical as well as horizontal displacements that complicate the subsurface situations. The average depth to the basement rocks in the northern basin ranges between 4 and f.5 km. meai .hile. The average calculated depth along South-Abu Gharadig Basin ranges from 3 km to 4 km. The southwestern area is occupied by the NNW-SSE trending Taghur Basin of Paleo/.oic age; with average depth up to 4.9 km. whereas, tlic depth to the northern anticlinal structure (Gib Ada High) is about 3 km and is considered to be approximately the same depth for the anticlinal uplift in the southeastern part (Cairo-Bahariya uplift). Key words: lotal intensitv aeromagnetic. Tectonic.Anticline, Svncline. Basin,

J. of applied science research, 6(1): 22-37 Rank: D

Crustal Modeling of South Sitra Area, North Western Desert, Egypt Using BouguerGravity Data

El-Khadragy, A. A.1'Saad, M.I 2, , Sbabaan, M.M1. and Azab, A.2 1Geology Department, Faculty of Science, Zagazig University, Egypt.

2Egyptian Petroleum Research Institute; Cairo, Egypt. ABSRACT The present study deals with the investigation of the nature (depth, density, thickness and topography) of the earth's crust and the uppe'r manlle of south Sitra area, north Western Desert through the application of spectral analysis and 2-D gravity modeling techniques on the Bouguer gravity data of the studied area. The average depths to the major density interfaces (Basement surface, Conrad and Moho discontinuities) expected throughout the crust are determined from the spectral analysis of the Bouguer anomalies along 20 selected profiles covering the study area. In addition, the approximate depth to the upper basement surface, as the shallowest interface, has been estimated along 31 short gravity profiles using four spectral analysis techniques. Moreover, the Bouguer gravity anomalies are used with the available geological and geophysical information to construct two dimensional (2-D) gravity models of the earth's crust along six profiles trending in NW-SH, N-S, and NE-SW directions. From these models, three maps for the basement surface, Conrad and Moho discontinuities were constructed. The obtained results from these 2-D crustal models and maps indicate that: 1) the crust beneath the area comnses two igneous layers: upper and lower crust underlain by upper mantle basaltic layer. 2) The depth to the basement surface; thickness of the sedimentary section; ranges between 2.8 at the south central and north western parts to more than 5.0 km. at the northern, southeastern and southwestern portions. Meanwhile, the depth of Conrad discontinuity; thickness of upper crust; varies approximately between 19.50 and 22.70 km. Where, the Moho depth; crustal thickness; ranges from 32.0 to 34.90'km. 3) the average densities for the different rock layers are: 2.43 gm/cm' for sediments, 2.74 gin/cm3 for the upper crustal layer, 2.93 gm/cnC for the lower crustal layer, and 3.28 gm/cm3 for the upper mantle layer.

Journal of Applied Sciences Research: 2010: Rank: D

Determining the Basement Parameters of South Sitra Area at North

Western Desert of Egypt Using the Contribution of Gravity and Magnetic Modeling Technique

Saad, M.I 1, El-Khadragy, A. A.2, Sbabaan, M.M2.and Azab, A.1

1Egyptian Petroleum Research Institute, Cairo, 2Geology Department, Faculty of Science, Zagazig University, Egypt.

ABSTRACT The main objective of (his study is lo determine the basement parameters; depth, clip, width, extension, location, source configuration and susceptibility for the magnetic data, or density for gravity data of south Silra areausing gravity and magnetic, modeling technique. The study was initiated by reducing the total intensity aeromagnetic data to the northern magnetic pole map. This followed by description of both the Bougucr gravity and RTF magnetic maps. Depth determination to the basement surface was applied on 31 gravity and 45 magnetic profiles using four spectral analysis methods. In addition, tentative depth to the basement contour map was constructed using the depth estimation results. Moreover, two different modeling techniques were applied on the data; the first one is the single anomaly modeling was applied on 3 1 gravity and 45 magnetic single, isolated and homogenous anomalies to reflect the near surface features with their parameters. Meanwhile, the second one is the 2.5-D gravity and magnetic modeling, was generated along eight cross-sections to support and refine the interpreted structures. Moreover, the areal istribution of the magnetic susceptibility was estimated by doing two tentative magnetic susceptibility maps at two main levels; on the surface and at the 3 km. The results of tins study show that, the depth values to the basement surface (thickness of the sedimentary succession) range between 2.h km. and 5.80 km. The models illustrate that the area is greatly affected by a number of normal and step-like faults resulting a great number of tilted faulted blocks and forming number of horsts and grabens. They indicate that the dip regime in the study area is in the northern direction.The basement rocks vary greatly in their composition as reflected by wide range of magnetic susceptibility of the different blocks, ft ranges between 0.0001 and 0.0045 c.g.s unit, reflecting that, this area is composed of anticlinal uplifted blocks of shallow depth and high susceptibilities alternating with downfaulted basinal or grabenal blocks of greater depth and lower susceptibilities. Also, density values of the modeled profiles vary greatly from site to site ranging from 2.5 to 3.37 g/cc. Finally, this study shows excellent agreement between the results of modeling and the magnetic characters, shape, elongation, frequency and magnitude of the magnetic anomalies along these eight profiles.

S.F. Mansour

Solid State Ionics,181, 1149-1155 Rank: B

Investigation of the physico-chemical properties of nanometric NiLa

ferrite/ PST matrix

M A Ahmeda, S..R Mansourb, S.I. EI-Deka aPhysics Department, Faculty of Science, Cairo University, Giza, Egypt

bPhysics Department. Faculty of Science .Zagazig University, Zagazig, Egypt

ABSTRACT Nickel ferrite NiLayFe2-v04 (0<y<0.05) was synthesized using citrate precursor method. The structure, particle size, shape and the homogeneity of the resulting nanoparticles were studied by X-ray diffraction and transmission electron microscope (TEM). IR was used to study the composition characteristics of the as-synthesized sample. Magnetic susceptibility of the samples with different La contents was studied at different temperatures and magnetic field intensities, Ac conductivity, dielectric constant and loss tangent of ferrite polymer composites prepared with different ratios of 10%, 30% and 50% in polystyrene (PST) matrix have been investigated in the frequency range (lO'-lO6 Hz). The dc magnetic susceptibility of the ferrite/PST matrix is also reported.

Journal of Alloys and Compounds 496 (2010) 345-350 Rank: B

Bi-moclal improvement of the physico-chemical characteristics of PEG and subnanoferrite

M.A Ahmeda*, N. Okashab , S.F. Mansourc, S.I. El-deka

aPhysics Department, Faculty of Science, Cairo University, Giza, Egypt bPhysics Department, Faculty of Girls. Am Shams University, Cairo, Egypt

cPhysics Department. Faculty of Science. Zagazig University, Zagazig, Egypt ABSTRACT MFe204 (M = Mn2+, Ni2+, Co2+ and Cu2+) ferrite powders were prepared by flash auto-combustion reaction. The structural identification of the samples was carried out using X-ray diffraction (XRD), transmission electron microscope (TEM), selected area electron diffraction (SAED) and 1R spectra. The study established the formation of sub-nanosized particles especially for MFe204 (M = Ni, Co and Cu) ferrites. MFe204/PEG (polyethylene glycol) composites were prepared by cold uniaxial pressing. The magnetic properties were studied by carrying out the hysteresis of MFe204 and PEG/MFe204 composite at room temperature. The data showed that MnFe204 has the highest saturation magnetization while CoFe204 has the largest coer-cive field due to the high anisotropy of Co2+ ions. The ac electrical conductivity as well as the dielectric-constant £ and loss tangent tan 8 were measured at different frequencies at room temperature. The highest conductivity is achieved for PEG/Ni Fe2O4 and the lowest value of tan 8 is obtained for PEG/MnFc20.} amongst all PEG/MFe2O4 nanocomposites.

Solid State Sciences (2010) 1-7 Rank : B

Modification of Mn nanoferrite physical properties by gamma, neutron, and laserirradiations

M.A. Ahmeda'', S.I. E!-deka, S.F. Mansourb, N. Okashac

aPhysics Department, Faculty of Science, Cairo University, Giza, Egypt bPhysics Department. Faculty of Science. Zagazig University, Zagazig

cPhysics Department, Faculty of Girls. Am Shams University, Cairo, Egypt , Egypt

ABSTRACT Manganese nanocrysralline ferrite powders were synthesized using citrate precursor technique. The ferrite samples were subjected to different types of irradiation; gamma rays, neutrons, and laser photons to compare their effects on the physical properties of prepared ferrite. The samples were characterized by XRD and IR techniques. XRD shows a shift in all planes keeping the spinel structure stable. The magnetic and dielectric behavior for the irradiated and unirradiated samples was investigated at different temperatures. The data recommended the use of this nanoferrite as radiation detector.

Mohsen M, Zareh

Sensor Letters, 2010, vol. 8, 1-8, Rank B

Compact Cell for the Selective Determination ofAscorbic Acid

Mohsen M, Zareh

Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt Original Compact Cell UCC" for the selective determination of ascorbic acid "AsA" was introduced. The cell was based on the uses of different types of neutral ionophores like ethoxy diaza 18-crown-6 and phosphorylated calix-6-arene derivatives. The CC was able to analyze AsA down to 2.2 x 10~5 M. The selectivity coefficient values were calculated for different inorganic cations. The values were suitable for measuring AsA in presence of different cations. Application for the deter-mination of AsA was applied for fruits using the proposed CC-AsA. The recovery values ranged between 97.4 and 100.7% for all samples. The relative standard deviation "BSD" ranges were 1.92-0.97% (for n = 6). Keywords: Compact Cell for Ascorbic, Ascorbic Acid Determination, Fruit Analysis.

Electroanalysis, 22,No.12,1369-1375 Rank:A

1-Pyrrolidine Dicarbodithioate Based Electrodes for Determination of Iron(III) in Lubrication Oil

Mohsen M. Zareh* Ismail E A. Ismail, Mohamd Abd El-Aziz.

Department of Chemistry, Faculty of Science, Zagazig University, Zagazig 44519, Egypt

ABSTRACT The lipophillic ammonium salt of 1-pyrrolidine dicarbodithioic acid (PCDT) (1) was introduced as a new selective ionophore for an iron selective electrode. In addition, the effect of immobilization of 18-crown-6 (18CE6) (membrane type-II), on the electrode performance was discussed. The slope of the PCDT-based (I) electrode was (20 mV/decade). The linear concentration range was (K^-IO"1 M) after one day doping. The detection limit for electrode type-(lf) was (1.3 x 10~6 M). For membrane with only 18CE6 (type-Ill) the Linear range and the detection limit were improved (10~5-10~l M and 3.2 x 10"6 M, respectively). The pH-range was between 5-11 for type-II, and III electrodes, while it was 7-11 for type-I electrode. Most of the common cations were tested for the evaluation of the electrode selectivity with correlation to the ionic radii of the tested cations. Among them only Ag+ and Pb2+were the real interference for type-Ill electrode. Application of using the electrode for the determination of iron in lubrication oil samples was performed with RSD (1.77-2.7%) and (1.01-2.3%) for type-II and III electrodes, respectively. The corresponding recovery ranges were (93.0-99.9%) and (96.3-100%). The obtained results were compared to those of an atomic absorption spectrophotometric method. Keywords: Iron selective electrode, Dicarbodithioate based membrane, Analysis of lubrication oil, lonophores, Immobilization

E.M.E. Zayed

Acta Appl. Math (2010) 111: 287-301 Rank: C

On the Rational Recursive Sequence xn+1 = Axn + Bxn−k + βxn+ γxn−k/Cxn+Dxn−k

E.M.E. Zayed - M.A. El-Moneam Department of Mathematics, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT Abstract In this article, we study the global and asymptotic properties of the solutions of the difference equation xn+1 = Axn +Bxn−k + (βxn + γxn−k)/(Cxn +Dxn−k), n = 0, 1, 2, where the initial conditions x−k, . .. , x−1, x0 are arbitrary positive real numbers and the coefficients A,B,C,D, βand γ are positive constants, while k is a positive integer number.Some numerical examples will be given to illustrate our results. Keywords Difference equations · Prime period two solution · Locally asymptotically stable· Global attractor · Global stability

Z. Naturforsch. 65a, 25-33 Rank:B

The Variational Iteration Method and the Variational Homotopy Perturbation Method for Solving the KdV-Burgers Equation and the

Sharma-Tasso-Olver Equation

Elsayed M. E. Zayed1 and Hanan M. Abdel Rahman2 1 Department of Mathematics, Faculty of Science, Zagazig University, Zagazig, Egypt

2 Department of Basic Sciences, Higher Technological Institute, Tenth of Ramadan City, Egypt In this article, two powerful analytical methods called the variational iteration method (VIM) and the variational homotopy perturbation method (VHPM) are introduced to obtain the exact and the numerical solutions of the (2+l)-dimensional Korteweg-de Vries-Burgers (KdVB) equation and the (l + l)-dimensional Sharma-Tasso-Olver equation. The main objective of the present article is to propose alternative methods of solutions, which avoid linearization and physical unrealistic assumptions. The results show that these methods are very efficient, convenient and can be applied to a large cla/ss of nonlinear problems. AY?y ii'mzAsv Variational Iteration Method; Variational Homotopy Perturbation Method; (2+l)-Dimensional Korteweg-de Vries-Burgers Equation; (l + D-Dimensional Sharma-Tasso-Olver Equation.

Inter. J. of Nonlinear Sci. & Numerical Simulation 11(4): 273-283, 2010 Rank: A

New Applications of an Improved ((G’<G)-expansion Method to

Construct the Exact Solutions of Nonlinear PDEs

Elsayed ML E. Zayed12, Khaled A. Gepreel12 1Mathematics Department, Faculty of Science, Taif University, El-Taif, El- Hawiyah,

Kingdom of Saudi Arabia 2 Mathematics Department, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT In the present article, we construct traveling wave solutions involving parameters of some nonlinear PDEs in mathematical physics namely Konopelchenko-Dubrovsky equations, Kersten- KrasiP Shchik equations, Whitham- Broer Kaup equations and the fifth order KdV equation using an improved (G1/G )— expansion method, where G satisfies a second order linear ordinary differential equation . When these parameters are taken special values, the solitary waves are derived from the traveling waves. The exact wave solutions are expressed by hyperbolic, trigonometric and rational functions. Comparison between this method and the exp-function method is presented. Keywords: an improved (G' / G) - expansion method, traveling wave solutions, solitary wave solutions, nonlinear PDEs, exp-function method

Inter. J. of Nonlinear Sci. & Numerica1 Simulation 11(8): 595-601, 2010 Rank: A

The Tanh Function Method using a Generalized Wave Transformation for Nonlinear Equations

Elsayed M.E. Zayed and Mahmoud A.M. Abdelaziz Mathematics Department, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT A generalized wave transformation is suggested to transform a partial differential equation to an ordinary differential equation; the tanh function method is then used to search for exact traveling wave solutions. The combined KdV-Burgers equation with variable coefficients is used as an example to elucidate the solution procedure, the results show that this method provides straightforward and powerful mathematical tools for solving nonlinear partial differential equations in mathematical physics. Keywords: The tanh-function method; Nonlinear combined KdV-Burgers equation with variable coefficients; Exact traveling wave solutions; Generalized wave transformation.

Mathematical Problems in Engineering, 2010, Rank :C

Applications of an Extended (G/G)-Expansion Method to Find Exact

Solutions of Nonlinear PDEs in Mathematical Physics

E. M. E. Zayed1'2 and Shorog Al-Joudi2 1 Mathematics Department, faculty of Science, Zagazig University, Zagazig, Egypt 2 Mathematics Department, Faculty of Science, Taif University, P.O. Box 888, El-

Taif, Saudi Arabia This is an open access article distributed under the Creative Commons Attribution License/ which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We construct the traveling wave solutions of the (l+l)-dimensional modified Benjamin-Bona-Mahony equation, the (2+l)-dimensional typical breaking soliton equation, the (l + 1)-climensional classical Boussinesq equations, and the (2+l)-dimensional Broer-Kaup-Kuperschmidt equations by using an extended (G'/G)-expansion method, where G satisfies the second-order linear ordinary differential equation. By using this method, new exact solutions involving parameters, expressed by three types of functions which are hyperbolic, trigonometric and rational function solutions, are obtained. When the parameters are taken as special values, some solitary wave solutions are derived from the hyperbolic function solutions.

Z. Naturforsch, (2010);65a, 1065 - 1070 Rank: B

Travelling Wave Solutions for the Burgers Equation and the Korteweg-de Vries Equation with Variable Coefficients Using the

Generalized (GVG)-Expansion Method

Elsayed M. E. Zayed and Mahmoud A. M. Abdelaziz Mathematics Department, Faculty of Science, Zagazig University, Zagazig, Egypt

In this article, a generalized (G'/G)-expansion method is used to find exact travelling wave solutions of the Burgers equation and the Korteweg-de Vries (KdV) equation

with variable coefficients. As a result, hyperbolic, trigonometric, and rational function solutions with parameters are obtained. When these parameters are taking special values, the solitary wave solutions are derived from the hyperbolic function solution. It is shown that the proposed method is direct, effective, and can be applied to many other nonlinear evolution equations in mathematical physics. t Key words: Nonlinear Evolution Equations; Generalized (G'/G)-Expansion Method; Hyperbolic Solution; Trigonometric Solution; Rational Solution; Burgers Equation; KdV Equation.

A. A. EL-DALY

Material Science and Engineering A:2010, 5212-5219 Rank: A

Effects of small addition of Ag and/ or Cu on the microstructure and Propertiesof Sn-9Zn lead-free solder

A. A. El-Daly Physics Department. Faculty of Science Zagazig University, Egypt

ABSTRACT In the present study, the effects of separate and dual addition of small amount of Ag and Cu on the microstructure and mechanical properties of the eutectic Sn–9Zn solder alloy were investigated. Results indicate that alloying of Ag and/or Cu resulted in refine the coarse needle-like Zn-rich phase and formation of intermetallic compounds (IMCs) with the eutectic solder. Single addition of Ag led to formation of AgZn, Ag5Zn8 and -AgZn3 IMCs, which results in significant increase in both ultimate tensile strength (UTS) and ductility, while, the flower shaped and rod shaped Cu6Sn5, γ-Cu5Zn8 and -CuZn5 IMCs produced by Cu alloying, results in small increase in UTS and ductility. The dual addition of Ag and Cu suppressed the appearance of Ag5Zn8 IMCs due to the competition for Zn between Cu and Ag, which results in slight decrease in UTS and ductility of Sn–9Zn–1.5Ag solder. Worthy of notice is that all alloys demonstrated an increase in both UTS and yield stress with increasing strain rate and/or decreasing testing temperature, indicating that the tensile behavior of the four alloys often exhibits a strain rate and temperature dependence.

Journal of Alloys and Compounds 505 (2010) 793-800 Rank: B

Properties and thermal behavior of Sn-Zn based lead-free solder alloys

A. A. El-Daly

Physics Department. Faculty of Science Zagazig University, Egypt

ABSTRACT In this study, the effects of separate and dual additions of small amount of Cu, In and Ag on the microstructure and elastic properties as well as thermal behavior of the eutectic Sn-9Zn solder alloy were investigated. The elastic properties of the newly developed ternary and quaternary alloys have been investigated using sound wave velocity measurements at 4MHz and T=25"C. In particular, the hardness, the attenuation coefficient, the bulk and shear moduli, Young's and Poisson's ratio have been established for a range of alloy compositions. Results showed that alloying of Cu, In and Ag resulted in reducing fusion heat, solidus temperature and broadening the pasty range. Moreover, the presence of additional elements in Sn-Zn alloy system allows many complex intermetallic (IMC) phases to form. Both the hardness and reduced modulus increase as the Poisson's ratio of the alloy decreases. The elastic properties can be correlated with the formation of the new IMC phases. By analyzing the quotient of shear moduius to bulk modulus, we can assume that the Sn-9Zn, Sn-9Zn-1.5Ag and Sn-9Zn-0.7Cu alloys are ductile solders whereas; the Sn-9Zn-1.5In and Sn-9Zn-l.5Ag-0.7Cu alloys are brittle in nature.

International journal of nanoscience .vol.9.No. 5, 399-406 Rank: D

STRUCTURAL AND MORPHOLOGICALCHARACTERIZATIONOF GOLD

NANOPARTICLES BY TEM AND DIGITAL CIS TECHNIQUE

A. A. El-Daly Physics Department. Faculty of ScienceZagazig University, Egypt

ABSTRACT

In this paper, we report a convenient and informative procedure for detecting the morphology and surface structure of individual gold nanocrystals using digital Crystal Image Software (CIS) processing of transmission electron microscopy (TEM) image, which comprises coalescence phenomena of these nanoparticles. The results show that the internal structure of Au nanoparticles has a core of gold atoms arranged as a Marks decahedron, surrounded by additional gold–organic compound layers forming a rigid surface layer, and its outer layer comprises four staple motif bridge molecules that resemble handles, formed an unusual pattern. The obtained results improved our understanding of the basics of the coalescence phenomena such as the driving mechanisms acting at different particle sizes. However, these discrete natures of the nanoparticles will assist in the understanding of principles of nanocore assembly and opens a new window for nanoparticles chemistry .

Keywords: Crystal morphology; crystal structure; growth from solutions; nanomaterials

Amr L. Saber

Electroanalysis ,2010, 22, 1-6 Rank: A

Novel Potentiometric Sensors for Determination of Melatonin and Oxomemazine in Biological Samples and in Pharmaceutical

Formulations

Anir L. Saber* Department of Chemistry, Faculty of Science, University of Zagazig, Zagazig, Egypt

ABSTRACT Simple, selective and accurate sensors were developed for the determination of melatonin and oxomemazine in biological samples (urine) and in pharmaceutical preparations. Potentiometric measurements were based on bismus tet-raiodate-drug ion-pair as novel electroactive materials incorporating a plasticized PVC membrane with o-nitrophen-yl octyl ether or dioctyl phthalate. Each sensor was conditioned for at least two days in 0.1 M drug solution before use. It exhibited fast and stable Nernstian response for melatonin and oxomemazine over the concentration range of 1.0xlO-6-1.0xlO~2M and l.Ox 10-6-1.0x 10-5 M, pH range of 3.0-6.5 and 3.5-6.0 for melatonin and oxomemazine sensors, respectively. Results with an average recovery not more than 101 % and a mean standard deviation less than 1.0% of the nominal were obtained for the four sensors. The sensors showed reasonable selectivity towards investigated drugs in presence of many cations. Keywords: Potentiometric sensors, Ion pairs, Biological samples, Pharmaceutical analysis, Melatonin hydrochloride, Oxomemazine hydrochloride

Soha F. Mohammed

j. of American science ,2010;6(10): 1032-1043 Rank: D

Synthesis and Characterization of Some N-Protected Amino Acid ^

Complexes

Soha F. Mohammed Department of Chemistry, Faculty of Science, Zagazig University.Egypt.

ABSTRACT Metal complexes of N-phthaloyl glycme with Cu(H), Ag(l). Cd(II), I-Ig(II). and Pb(li) have been prepared in aqueous methanohc solution. The complexes have been characterised by elemental analysis, thermo gravimetric analysis (TG. DTG), and mass, infrared and 'H-NMR spectra. Infrared spectra were detected concerning, the Final residual of the thermal decomposition of all the N-phthaloyl glycme complexes. N-phthaloyl giycine (Gly) molecule coordinated to the metal ions through its carboxylic group. Key words: N-protected ammo complexes, Infrared spectra, 'FINMR, Mass Spectra, Thermogravimctric analysis.

Akram M. EI-Didamony

Drug testing and analysis, 2010, 2,122-129 Rank: D

A sensitive spectrophotometric methodfor the determination of

propranolol HCI basedon oxidation bromination reactions

Akram M. EI-Didamony* * Department of Chemistry, Faculty of Science, Zagazig University. Egypt.

Three new, simple, sensitive, rapid and economical spectrophotometric methods (A, B and C) have been developed for the determination of propranolol hydrochloride (PRO) in bulk drug and dosage forms. These methods are based on oxidation-bromination reaction of PRO by bromine, generated in situ by the action of acid on a bromate-bromide mixture, followed by determination of unreacted bromine by three different reaction schemes. In method A, the determination of the residual bromine is based on its ability to bleach the indigo carmine dye and by measuring the absorbance at 610 nm. The residual bromine (in method B), is treated with excess of iron(ll) and the resulting iron(lll) is complexed with thiocyanate and the absorbance is measured at 480 nm. Method C involves treating the unreacted bromine with a measured excess of iron(ll) and the remaining iron(ll) is complexed with 1,10-phenanthroline and the increase in absorbance is measured at 510 nm. In all three methods, the amount of bromine reacted corresponds to the drug content. The different experimental parameters affecting the development and stability of the colour are carefully studied and optimized. Beer's Law is valid within a concentration range of 1_137 4-12 and 2-9 jig ml"1 for methods A, B, and C, respectively. The molar absorptivity, Sandell's sensitivity, detection and quantification limits are calculated. Common excipients used as additives in pharmaceutical preparations do not interfere in the proposed methods. The proposed methods have been successfully applied to the determination of PRO in pharmaceutical preparations and the results were statistically compared with those of the official method by applying the Student's f-test and F-test. Keywords: propranolol; spectrophotometry; bromate-bromide mixture; redox reactions; pharmaceutical formulations

Spectrochimica Acta Part A: (2010) 1138-1145 Rank: B

Utilization of oxidation reactions for the spectrophotometric

determination of captopril using brominating agents

Akram M. El-Didamony*, Eman A.H. Erfan Chemistry Department, Faculty of Science, Zagazig University, Zagazig 44511. Egypt

ABSTRACT Three simple, accurate and sensitive methods (A-C) for the spectrophotometric assay of captopril (CPL) in bulk drug, in dosage forms and in the presence of its oxidative degraciates have been described. The methods are based on the bromination of captopril with a solution of excess brominating mixture in hydrochloric acid medium. After bromination, the excess brominating mixture is followed by the estimation of surplus bromine by three different reaction schemes. In the first method (A), the

determination of the residual bromine is based on its ability to bleach the indigo carmine dye and measuring the absorbance at 610nm. Method B, involves treating the unreactecl bromine with a measured excess of iron(ll) and the remaining iron(II) is complexed with 1,10-phenanthroline and the increase in absorbance is measured at 510nm. In method (C), the surplus bromine is treated with excess of iron(II) and the resulting iron(III) is complexed with thiocyanate and the absorbance is measured at 478 nm. In all the methods, the amount of bromine reacted corresponds to the drug content. The different experimental parameters affecting the development and stability of the color are carefully studied and optimized. Beer's law is valid within a concentration range of 0.4-6.0, 0.4-2.8 and 1.2-4.8 µgmL-1 for methods A, B and C, respectively. The calculated apparent molar absorptivity was found to be 5.16 x 104. 9.95 x 104 and 1.74x 105Lmol-1 cm-1, for methods A, B and C, respectively. Sandell's sensitivity, correlation coefficients, detection and quantification limits are also reported. No interference was observed from common additives found in pharmaceutical preparations. The proposed methods are successfully applied to the determination of CPL in the tablet formulations with mean recoveries of 99.94-100.11% and the results were statistically compared with those of a reference method by applying Student's r- and F-test. Keywords:Redox reactions, Bromate-bromide mixture, Spectrophotometry, Captopril Pharmaceutical formulations

Arabian Journal of Chemistry: (2010) 3. 265-270 Rank: D

Spectrophotometric determination of diphenhydramine

hydrochloride in pharmaceutical preparations and biological fluids via ion-pair formation

Akram M. EI-Didamony a'*, Moftah A. Moustafa b

aChemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt b Chemistry Department, Faculty of Science, Omar El-Moktar University, Tohruk, Libya

ABSTRACT A simple, sensitive and accurate Spectrophotometric method has been described for the assay of diphenhydramine hydrochloride (DPH) in raw material and in biological samples. The method is based on extraction of DPH into dichloromethane as ion-pair complexes with patent blue (PB), eriochrome black T (EBT), methyl orange (MO) and bromocresol purple (BCP) in acidic medium. The coloured species exhibited absorption maxima at 632, 514, 428 and 414 nm for PB, EBT, MO and BCP, with molar absorptivity values of 1.32 xlO5, 2.36 xlO4, 3.68 x JO4 and 3.07 x 104 1 mol-1 cm"1, respectively. The reaction conditions were optimized to obtain the maximum colour intensity. Beer's law was obeyed with a good correlation coefficient (0.9982-0.9993) in the concentration ranges 0.5-3, 2.0-16, 2.0-10 and 1.0-10 µg ml-1 for PB, EBT, MO and BCP methods, respectively. The composition ratio of the ion-association complexes was found to be 1:1 in all cases as established by Job's method. The conditional stability constant (A'/) and the free energy changes (A(/°) were determined for all complexes formed. The proposed method was successfully applied for the determination of DPH in tablets and human urine with good accuracy and precision. Statistical comparison of the results with those obtained by the official

method showed good agreement and indicated no significant difference in accuracy and precision. KEYWORDS Diphenhydramine hydrochloride; Patent blue; Methyl orange; Bromocresol purple; Eriochrome black T; Tablets; Urine; Spectrophotometry

Ashraf Sabry Biotechnol.Lett.,(2010) 32:1877-1881 Rank: B

Enzymatic synthesis of y-glutamylglutamine, a stable glutamine

analogue, by y-glutamyltranspeptidase from Escherichia coli K-12

A. Sabry, . A. F. E. Sayed • Microbiology Department, Faculty of Science, Zagazig University, Zagazig, Egypt

S. Fujimoto • C. Yamada •H. Suzuki (IS1) Division of Applied Biology, Graduate School of Scienceand Technology, Kyoto Institute of

Technology,Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan

S. Fujimoto • C. Yamada Division of Integrated Life Science, Graduate School of Biostudies, Kyoto University, Kitashirakawa,

Sakyo-ku, Kyoto 606-8502, Japan

ABSTRACT The optimal reaction conditions for the synthesis of y-glutamylglutamine using y-glutamyl-transpeptidase from Escherichia coli were determined. The maximum yield of y-glutamylglutamine (110 mM) was obtained using 250 mM L-glutamine and 1.1 U y-glutamyltranspeptidase/ml at pH 10.5 and at 37°C for 7 h; the conversion of glutamine to y-glutamylglutamine was 88%. Keywords: Glutamine • y-Glutamylglutamine, y-Glutamyltranspeptidase • Transpeptidation

A.H. Moustafa

Current Organic Chemistry, 2010, 14, 2012-2015 Rank:A On the Reaction of N-Forrnylbenzotriazole and Alkylacetonitrilium

Salts

A.H Moustafa* Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT Reaction of N-methyl/isopropylacetonitrilium hexachloroantimonate la, b with N-formvlben/.otriazole 2 afforded the corresponding iminium salts 4a, b; of which 4a reacts with the oxime derivatives 5a-d to give the corresponding N-oxyiminium salts

6a-d in a good yield (60-92 %). Reaction of N-methylacetonitrilium hexachloroantimonate la with norbornene (7) furnished the new ring system l,4,4a,5,6,7,818a-octahydro-5)8-methano-4(2-norbomyl}-naphthridinium hexachloroantimonate 10 in 85 % yield. The Treatment of 10 with DDQ oxidized the two bridged protons and afforded 1,4,5,6,7,8-hexahydro-5,8-methano-4(2-norbomyl)-naphthrdinium hexachloroantimonate 11 in 80% yield. Key Words: Nitrilium salts, N-formylbenzotriazole, norbornene, Hue product, iminium salts, octahydro-5, 8-methanonaphthridinmm sa

H. M. Barakat J.Pure Appl. Math., 2010:41(6) Rank:C

ON THE RATE OF CONVERGENCE TO ASYMPTOTICINDEPENDENCE BETWEEN ORDER STATISTICS UNDER POWERNORMALIZATION

WITH EXTENSION TO THE GENERALIZEDORDER STATISTICS

H. M. Barakat and E. M. Nigm Department of Mathematics,Faculty of Science, Zagazig University, Zagazig, Egypt

Based on the notion of the associated copula for order statistics and some LI -distances, we derive a symmetric nonpararnetric measure of asymptotic dependence between the order statistics under power normalization. This nonpararnetric criterion of dependence is extended to the generalized, as well as the dual generalized, order statistics. Key words: Nonpararnetric Measures of Dependence; Power Normalization, Asymptotic Dependence Between Order Statistics, Generalized Order Statistics, Dual Generalized Order Statistics.

Mohamed I. Othman

Biostatistics, Bioinformaticsand Biomathematics, vol.1(.1), 21-41 Rank: D

A FAMILY OF FLEXIBLE SCORE FUNCTIONS FOR BLIND SOURCE SEPARATION

R. M. FAROUK, JMOHAMED I. A. OTIIMAN and K. A. RIAD Department of Mathematics, Faculty of ScienceZagazig Universit, Zagazig, Egypt

ABSTRACT Separation of mixed and overlapped images is a frequently arising problem in image processing. For example, separation of overlapped fingerprints obtained from any crime scene-, in which we get a mixture of two or more fingerprints. For identification, we need to separate them. In this paper, the original signals are identifiable and mutually statistically independent at the time1 of mixing. The separation process is solved by proposing an entirely novel family of flexible score functions for blind source separation, based on a family of generalized gamma densities. To blindly extract the independent source signals, we resort to the popular

Fast Independent Component Analysis (Fast-ICA) approach, to adaptively estimate1 the parameters of such score functions, we use an efficient method based on maximum likelihood. The results, obtained using generalized gamma densities in our technique, are better than that obtained by other distribution functions.

Mechanics and mechanical engineering.vol.14 .No.1, 5-30 Rank: D

Generalized Electro—Magneto—Thermoelasticity in Case of

Thermal Shock Plane Waves for a Finite Conducting Half-Space with Two Relaxation Times

Mohamed I. A.Othman

Faculty of Science, Department of Mathematics, Zagazig University The propagation of (dectromagncto-thennoelastic disturbances produced by a thermal shock in a finitely conducting elastic half—space is investigated. The formulation is applied to two-dimensional equations of generalized thermoelasticity Green and Lmdsay's theory with two relaxation times. There acts an initial magnetic field parallel to the plane boundary of the; half-space. The medium deformed because of thermal shock and due to the application of the magnetic field, there result an induced magnetic and an induced electric field in the medium. The Maxwell's equations are formulated and the electromagneto-therrnoelastic coupled governing equations are established. 'The normal mode analysis is used to obtain the exact expressions for the considered variables. The distributions of the considered variables are represented graphically for different values of times. From the distributions, it can be found the wave type heat propagation in the medium. This indicates that the generalized heat- conduction mechanism is completely different from the classic Fourier's in essence, in generalized thermoelasticity theory heat propagates as a. wave with finite velocity instead of infinite velocity in medium.

Mechanics and mechanical engineering,.vol.14 . No.1, 31-55 Rank: D

The Effect of Rotation and Thermal Shock on a Perfect ConductingElastic Half-Space in Generalized Magneto-

thermoelasticitywith Two Relaxation Times

Moharned LA. OTHMAN Faculty of Science, Department of Mathematics, Zagazig University

The propagation of electroniagneto--thermoelastic disturbances produced by a. thermal shock in perfectly conducting elastic half-space when the entire elastic: medium is rotating with a uniform angular velocity is investigated. The problem is in the context- of the Green and Lindsay'.s generalized thermoelasticity with two relaxation times. There acts an initial magnetic field parallel to the plane boundary of the half-space. The medium deformed because of thermal shock, and due to the application of the magnetic held. The normal mode analysis is used to obtain the exact expressions for the considered variables. The distributions of the considered variables are represented graphically. From the distributions, if can be found the wave type heat

propagation in the medium. This indicates that the generalized heat conduction mechanism is completely different from the classic Fourier's in essence. In generalized thermoelasticity theory heat propagates as a, wave with finite velocity instead of infinite velocity in medium. Comparisons are made with the results predicted by the coupled theory in present and absent rotation. Keywords: Thermal relaxation times, generalized thermo— elasticity theory, rotation effect, normal mode analysis, electromagneto— thermoelastic couple

International Communications in Heat and Mass Transfer. 2010, 37 Rank: A

On the plane waves of generalized thermo-microstretch elastic half-space underthree theories

Mohamedl.A, Othman *, Kh. Lotfy

Mathematic Dep., Faculty of Science, Zagazig University,Zagazig, Egypt

ABSTRAC A general model of the equations of generalized thermo-microstretch tor a homogeneous isentropicelastic half space is given. The formulation is applied to generalized therrnoelasticily theories, The lord-Shlmiinan and Green-Lindsay theories, as well as the classical dynamical coupled theory. The normal mode analysis is used to obtain the exact expressions for the displacement components, force stresses, temperature, couple stresses and microstress distribution. The variations of the considered variables through the horizontal distance arc illustrated graphically. Comparisons are made with the results in the presence and absence of microstretch constants and between the three theories for two different times.

Engineering Analysis with Boundary Elements:(2010) 43: 229-237 Rank: A Generalized thermo-microstretch elastic medium with temperature

dependent properties for different theories

Mohamed LA. Othman a-b, Kh. Lotfya-*and R.M. Farouk Mathematic Dep., Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT A general model of the equations of generalized thermo-microstretch for a homogeneous isotropic: elastic half-space is given. The modulus of elasticity is taken as a linear function of reference temperature. The formulation is applied to generalized thermoelasticity theories, the Lord-Shulman and Green-Lindsay theories, as well as the classical dynamical coupled theory. The normal mode analysis is tised to obtain the exact expressions for the displacement components, force stresses, temperature, couple stresses and microstress distribution. The variations of the considered variables through the horizontal distance are illustrated graphically. A comparison is made with the results predicted by the three theories in case of temperature-independent modulus of elasticity.

Keywords:(L--S) theory, ((G'-1.) theory, Temperature dependent properties, Microrotarion, Microstrerch

Abd-El Aziz M. SALEM

CHIN. PHYS. LETT..(2010) 27( 6) Rank: C

Temperature-Dependent Viscosity Effects on Non-Darcy Hydrodyiiarnic Free Convection Heat Transfer from a Vertical

Wedge in Porous Media A. M. Salem'

Department of Mathematics, Faculty of Science, Zagazig University, Zagazig.Egypt An analysisis presented to investigate the effect of temperature-dependent viscosity on free convection flow along a vertical wedge adjacent to a porous medium in the presence of heat generation or absorption. The governing fundamental equations are transformed into the system of ordinary (inferential expiations using scaling groupof transformation and are solved numerically by using the fifth-order Rung Kutta method with shooting technique fir various values of the physical parameters. The effects of variable viscosity parameter on the velocity, temperature and concentration are discussed. Numerical results for the problem considered are given and illustratedgraphically.

Thermal Science: 2010, 14, (4), 1111-1120 Rank: D

EFFECT OF VARIABLE VISCOSITY AND SUCTION/INJECTIONON

THERMAL BOUNDARY LAYER OF A NON-NEWTONIANPOWER-LAW FLUIDS PAST A POWER-LAW STRETCHED SURFACE

Abe-El Aziz M. SALEM and Rania FATHY

Department of Mathematics, Faculty of Science, Zagazig University/Zagazig, Egypt The analysis of laminar boundary layer flow and heat transfer of non-Newton i cm fluids over a continuous stretched surface with suction or injection has been presented.The velocity and temperature of the.sheet were assumed to vary in a power-law form, that is u — Uϭxm, and Tw(x) = T™ + Cxb The viscosity of the fluid is assumed to be inverse linear function of temperature. The resulting governing boundary-layer equations are highly non-linear and coupled form of partial differ-ential equations and they have been solved numerically by using the Runge-Kutta method and Shooting technique. Velocity and temperature distributions as well as the Nusselt number where studied for two thermal boundary conditions: uniform surface temperature (b =0) and cooled surface temperature (b = -1), for different parameters: variable viscosity parameter ϭn temperature exponent b, blowing parameter d and Prandtl number. The obtained results show that the flow and heat transfer characteristics are significantly influenced by these parameters. Key words: variable viscosity, heat transfer, non-Newtonian power-law fluids, stretching sheet

J. of the Korean physical society, vol.57, No .6 , 1401-1407 Rank:D

Effect of Thermal Radiation on MHD Mixed Convective Heat Transfer Adjacent to a Vertical Continuously Stretching Sheet in the

Presence ofVariable Viscosity

A, M. SALEM* and Rania FAT MY Department of Mathematics, Faculty of Science, Zagazig University, Egypt

An analysis is presented to study the combined free-forced convective laminar boundary layer flow adjacent to a vertical continuously stretching sheet in the presence of a magnetic field with variable viscosity arid thermal radiation. The velocity and the temperature of the sheet were assumed to vary in a power law form, that is, uw= Bxinand Tw(x) -T∞ = Axu .The governing equations for the problem were changed to dimensionless ordinary differential equations by using a. similarity transformation. The transformed governing equations in the present study were solved numerically by using the Runge-Kutta and Shooting method. A comparison between the analytical and thenumerical solutions has been included. The effects of the variable viscosity parameter, the mixedradiation parameter N and the magnetic field parameter G,are discussed through graphs. Graphical results illustrating interesting features of the physics of the problem are presented and discussed. Keywords: Boundary layer heat low, Thermal radiation, Forced convection., Magnctohy-drodynamic.s

H.S. Bauomy Applied Mathematical Modeling (2010):2763-2777 Rank: B

Nonlinear study of a rotor-AMB system under simultaneous primary-internal resonance

M. Kamela, H.S. Bauomyb*

aDepartment of Engineering Mathematics, Faculty of Electronic Engineering, Menoufw University, Menouf 32952, Egypt

b Department of Mathematics, Faculty ofScience, Zagazig University Zagazig 44511, Egypt ABSTRACT A rotor-active magnetic bearing (AMB) system subjected to a periodically time-varying stiffness with quadratic and cubic non-linearities under multi-parametric excitations is studied and solved. The method of multiple scales is applied to analyze the response of two modes of a rotor-AMB system with multi-parametric excitations and time-varying stiffness near the simultaneous primary and internal resonance. The stability of the steady state solution for that resonance is determined and studied using Rung-Kutta method of fourth order. It is shown that the system exhibits many typical non-linear behaviors including multiple-valued solutions, jump phenomenon, hardening and softening non-linearities and chaos in the second mode of the system. The effects of the different parameters on the steady state solutions are investigated and discussed also. A comparison to published work is reported. Keywords

Rotor-active magnetic bearing, Time-varying stiffness, Multi-parametric excitations, Stability, Multiple-valued solutions, Jump phenomenon

Meccanica,(2010).45:7-22 Rank: C

Nonlinear behavior of a rotor-AMB system under multi-parametric

excitations

M. Kamel Department of Engineering Mathematics, Faculty of Electronic Engineering, Menoufia University,

Menouf 32952, Egypt

H.S. Bauomy (EH) Department of Mathematics, Faculty of Science, Zagazig University, Zagazig 44511, Egypt.

ABSTRACT A rotor-active magnetic bearing (AMB) system subjected to a periodically time-varying stiffness with quadratic and cubic nonlinearities under multi-parametric excitations is studied and solved. The method of multiple scales is applied to analyze the response of two modes of a rotor-AMB system with multi-parametric excitations and time-varying stiffness near the simultaneous primary and internal resonance. The stability of the steady state solution for that resonance is determined and studied using Runge-Kutta method of fourth order. It is shown that the system exhibits many typical non-linear behaviors including multiple-valued solutions, jump phenomenon, hardening and softening non-linearities and chaos in the second mode of the system. The effects of the different parameters on the steady state solutions are investigated and discussed also. A comparison to published work is reported. Keywords Rotor-active magnetic bearing • Time-varying stiffness • Multi-parametric

S. A. HODA IBRAHIM

Kuwait j. of science& engineering 37: 1-14 Rank: C

Comparative study of multigrid methods and neural network

methods for boundary value problems with irregular boundaries

S. A. HODA IBRAHIM Faculty of Science,Zagazig University, Egypt.

In this paper multigrid methods and neural network methods were used to solve the -u.nial differential equations (PDEs) with boundary conditions (Dirichlet or Neumann) defined on boundaries with simple geometry have been successfully treated on two-dimensional and three-dimensional PDEs. According to the results, multigrid method seems to have certain advantages both in efficiency and in, interpolation accuracy. Keywords: Boundary value problems, irregular boundaries, neural networks, multi-grid methods, partial differential equations.

J. Appl. Math. & Informatics, 252(5): 1467-1476 Rank: D

An Improved Exponential Regula Falsi Methods with Cubic Convergence for Solving NonlinearEquations

S. A. HODA IBRAHIM

Faculty of Science, Zagazig University, Egypt.

ABSTRACT. The aim of this paper is to propose a cubic convergent regula falsi iterative method for solving the nonlinear equation f(x) = 0, where f: [a, b] JR -» JRt is a continuously differentiable. In [3,6] a quadratically convergent regula falsi iterative methods for solving this nonlinear equations is proposed. It is shown there that both the sequences of diameters and iterative points sequence converge to zero simultaneously. So the aim of this paper is to accelerate further the convergence of these methods from quadratic to cubic. This is clone by replacing the parameter p in the iteration of [3,5,6] by a function p(x) defined suitably. The convergence analysis is carried out for the method. The method is tested on number of numerical examples and results obtained shows that our methods are better and more effective and comparable to well-known methods.

Key words and phrases: Nonlinear equations, Regula-falsi methods, New-tons methods, Cubic convergence.

Mohamed A.E. Herzallah

ON THE FRACTIONAL-ORDER DIFFUSION-WAVE PROCESS

Mohamed A.EHerzallah1, Ahmed M.A. El-Sayed2, Dumitru Baleanu3

1'Faculty of Science, Zagazig University, Zagazig, Egypt E-mail: m_herzallah75@hotmail.com 2Faculty of Science, Alexandria University, Egypt

2Department of Mathematics and Computer ScienceAnkaya University, 06530 Ankara, Turkey,3Institute of Space Sciences,P.O.BOX, MG-23, RO-077125, Magurele-Bucharest, Romania

One of the main applications of the fractional calculus, integration and differentiation of arbitrary orders is the modelling of the intermediate physical processes. Here we formulate a more general model which represents the diffusion wave process in all its cases, and give some examples discussing these different cases.

Key words: Evolution equation, fractional order derivative, Diffusion-Wave equation.

Nonlinear Dyn., 2010 Rank: B

Perturbation for fractional-order evolution equation

M.A.E. Herzallah Faculty of Science, Zagazig University, Zagazig, Egypt

A.M.A. El-Sayed Faculty of Science, Alexandria University, Alexandria,Egypt

D. Baleanu Department of Mathematics and Computer Science, f ankaya University, 06530 Ankara, Turkey

ABSTRACT

Fractional calculus has gained a lot of importance during the last decades, mainly because it has become a powerful tool in modeling several complex phenomena from various areas of science and engineering. This paper gives a new kind of perturbation of the order of the fractional derivative with a study of the existence and uniqueness of the perturbed fractional-order evolution equation for cDα

0u(t) — A cD*+u(t) + f(t), u(0) = u0,αε (0, l),andO<ε, δ<uunder the assumption that A is the generator of a bounded Cr;-semigroup. The continuation of our solution in some different cases for a, € and S is discussed, as well as the importance of the obtained results is specified.

Keywords Evolution equation • Evolutionary integral equation • Fractional order derivative • Perturbation problem

J.of computatational and Non- linear dynamics, 2010, Vol.5 Rank: B

On abstract Fractional Order Telegraph Equation

M.A.E. Herzallah Faculty of Science, Zagazig University, Zagazig, Egypt

A.M.A. El-Sayed Faculty of Science, Alexandria University, Alexandria,Egypt

D. Baleanu Department of Mathematics and Computer Science, f ankaya University, 06530 Ankara, Turkey e-mail:

During the last decade's, there has been a great deal of interest in fractional differential equations and their applications in various fields of science and engineering. In this paper, we give a new model of the abstract fractional order telegraph equation and we study the existence and uniqueness theorems of the sinj/ig and mild solutions as well as the continuation of this solution. To illustrate the obtained results, two examples were analyzed in detail.

Galal Ismail

Chin. Phys. B Vol. 19, No. 10 (2010) Rank: A

Glassy phase arid thermodynamics for random field Ising model on spherical lattice in magnetic field

Khalid Banniora;. Galal Isrmaila, and Wafaa Ha-ssan1 Faculty of Science, Zagazig University, Zagazig, Egypt

Phase diagram and thermodynamic parameters of the random field Ising model (RFIM) on spherical lattice are studied by using mean field theory. This lattice is placed in an external magnetic field (B). The random field (hi) is assumed to be Gaussian distributed with zero mean and a variance 〈h2

i〉 = H2RF. The free energy

(F), the magnetization (M) and the order parameter (q) are calculated. The ferromagnetic (FM) spin-glass (SG) phase transition is clearly observed. The critical temperature (TC) is computed under a critical intensity of random field . The phase transition from FM to paramagnetic (PM) occurs at TC = J/k in the absence of magnetic field. The critical temperature decreases as HRF increases in the phase boundary of FM-to-SG. The magnetic susceptibility (X) shows a sharp cusp at TC and the specific heat (C) has a singularity in small random field. The internal energy (U) has a similar behaviour to that obtained from the Monte Carlo simulation

S. Abd El Wanees

J. of Dispersion science and technology, 2010, 31, 1516-1525 Rank: C

Inhibition of Silver Corrosion in Nitric Acid by Some Aliphatic Amines

S. Abd El Wanees1,A. Abd El Aal Mohamed,1 M. Abd El Azeem,2 and R. El Said1

1Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt 2 Chemistry Department, Faculty of Science, Monofia University, Monofia , Egypt

The inhibition of silver corrosion in dilute nitric acid (0.01 M) was studied using electrochemical polarization technique in the presence of different concentrations of methylamine, ethylainine, n-prop) laniine, and n-butylamine. It was found that the inhibition efficiency obtained from Tafel plots improved when the inhibitor concentration and the length of the alkyl chain were increased. The inhibition efficiency increased markedly with increase the additive concentrations according to the following order: methylamine < ethylamine < n-propylamine < n-butylamine. The inhibition action of such compounds occurred by simple blocking of amines on the electrode surface through adsorption process according to Temkin adsorption isotherm. The nearly constant values of the anodic Tafel slopes indicated that the presence of such amines do not affect the mechanism of metal dissolution.

Keywords Adsorption isotherm, corrosion inhibitors, n-alkyl amine.

Corrosion Science, (2010) 52: 1675-1683 Rank: A

Environmental factors affecting the corrosion behavior of reinforcing steel: IV. Variation in the pitting corrosion current in relation to the

concentration of the aggressive and the inhibitive anions

S.M. Abd El Haleem, S. Abd El Wanees", E.E. Abd El Aal, A. Diab Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT

The pitting corrosion current of reinforcing steel is measured under natural corrosion conditions in Ca(OH)2 solutions in presence of Cl− as aggressive ions and

as inhibiting anions. The corrosion current starts to flow after an induction period which depends on solution composition (concentration, pH and presence or absence of the aggressive and the inhibiting anions). The limiting corrosion currents increase with increasing the Cl− ion concentration and decrease with increasing the pH and inhibiting ions concentration. The inhibition efficiency of the studied inhibiting ions increases in the following order: , and depends on the way by which the inhibitor is added to the solution. Injection of the inhibiting anions in solution causes repassivation of the pre-formed pits through competition with Cl− ions for adsorption sites on metal oxide surface. The adsorbability constant and the free energy of repassivation of the inhibiting anions are calculated.

Keywords: A. Reinforcing steel, A. Ca(OH)2, A. Aggressive anions, C. Inhibition, C. Pitting corrosion current, C. Repassivation

S.M. Abd El Haleem

CorrosionScience 52 (2010) 3875-3882 Rank: A

Environmental factors affecting the corrosion behaviour of reinforcing steel: I. The early stage of passive film formation in

Ca(OH)2 solutions

S.M. Abd El Haleem, E.E. Abd El Aal*. S. Abd El Wanees, A. Diab Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT

Oxide film thickening on reinforcement steel at early stage of formation is followed in naturally aerated Ca(OH)2 solutions, recalling the natural behaviour in concrete, by measuring the open-circuit potential, E, with time up to 4 h. The final potentials, Efin, are reached from negative values indicating oxide film growth. E varies with the Ca(OH)2 concentration according to a straight line relationship. Oxide film thickening, at early stage of immersion, follows a direct logarithmic growth law as evident from the linear relationship between E and log t. The rate of oxide film thickening deceases by increasing the concentration and pH of the solution and by raising the temperature. The free activation energy of oxide film thickening is determined and found to be 29.28 kJ/mole, indicating that the process of oxide film growth is under diffusion control.

Journal of Dispersion Science and Technology, 31:512-528, 2010 Rank: C

A Study of the Electrochemical Behavior of Copper in Acid Medium in Presence of Some Organic Amine Compounds c

Salah M. Abd El Hleem,1 A. M. Ahmed,2 and A. E. El-Naggar3 1Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt

2Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt 3Alexandria National Refining and Petroleum Company (ANRPC), Alexandria, Egypt

The rate of corrosion of copper metal in presence of methyl amine, dimethyl amine, diethyl amine, triethyl amine, diethanol amine, and triethanol amine determined by measuring the anodic limiting current. The factors used are type of organic amine compounds and its concentration, concentration of H3Po4, viscosity of solution, density, diffusion coefficient, and rate of rotation. It has been found that, the rate of corrosion decrease in presence of these compounds. The inhibition percentage ranged from 9.72% to 80.14% depending on the type of inhibitor and its concentration. It is suggested that the decrease in the rate of corrosion is attributed to the increase in interfacial viscosity of the solution and decrease the diffusion coefficient of the copper ion. It has been found that we can apply the Langmuir, Flory-Huggins, and kinetic adsorption isotherms. It has been found that the rate of inhibition is increases in order: methyl amine, dimethyl amine, diethyl amine, triethyl amine, diethanol amine, and triethanol amine. The rate of corrosion depends on the Il3po4 concentration as well as on the electrode height. The limiting current in undivided cells is higher than in divided cells due to the uprising H2 bubbles, which enhances the rate of corrosion. Also, the rate of corrosion was found to increase by increasing the speed of rotating electrode. The dimensionless groups were calculated, and the relation between them was given and the equation given as following: Sh = 0.5046 Re0-720VSc)°-33 for methyl amine; Sh = 0.5381 Re0/7157(Sc)°-33 for dimethyl amine; Sh-0.4887 Re0/735^(Sc)0-33 for diethyl amine; Sh = 0.5167 Re°-7207(Sc)0-33 for triethyl amine; Sh = 0.5373 Re0'7238(Sc)0>33 for diethanol amine; and Sh = 0.4958 Re0'7280 (Sc)°l33 for triethanol amine.

Keywords Adsorption isotherm, copper, corrosion, electro-polishing, limiting current density

Hammad Fetooh

Journal of Molecular Structure 983 (2010) 122-132 Rank: B

Spectroscopic and thermal characterization of Cu(II), Co(II), Ni(II) and Mn(II) complexes of fluorescent dye 4-N.N-dimethyl-ethanol

amine-N-allyl-1,8-naphthalimide

Moamen S. Refata-a, c* Hamada MA Killacb, Hammad Fetoohb

aDepartmentof Chemistry, Faculty of Science, Port Said University, Port Said 4211I, Egypt b Department Chemistry, Faculty of Science, Taif University, 888 Tai/, Saudi Arabia

cDepartment Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT

Compounds having general formula: [M(4DMEAN)X (Cl)2(H2O)Y]·ZH2O, where (M = Cu(II), Co(II), Ni(II) and Mn(II), 4DMEAN = 4-N,N-dimethyl-ethanolamine-N-allyl-1,8-naphthalimide, X = 1 or 2, Y = 0 or 2 and Z = 1, 2, 4 or 6) have been prepared. The resulted compounds were characterized by elemental analysis, conductivity measurements, magnetic measurements, (infrared, 1H NMR, mass and electronic) spectra and thermogravimetric analysis. The results were suggested that all 4DMEAN complexes formed have a 1:1 M ratio (metal: 4DMEAN) except for Co(II) complex exist as 1:2. The 4DMEAN ligand acts as a neutral bidentate through both of the oxygen atom of ( C OCH2) group and the lone pair of electron on the nitrogen atom of (N(CH3)2 group. The molar conductance measurements proved that the 4DMEAN complexes are non-electrolytes. The kinetic thermodynamic parameters such as: E*, ΔH*, ΔS* and ΔG* were estimated from the DTG curves.

Keywords ;- N,N-dimethyl-ethanolamine-N-allyl-l,8 -, naphthalimide, Metal complexes, TGA, Spectroscopic characterization, Conductivities

Said A. Said

Journal Of Chemical Research 2010, 528-532 Rank: C

Synthesis of a novel series of pyrimido- and triazino[4,5-b] quinolines

Said A. Said and Ahmed H. Moustafa* Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt

New tetrahydropyrimido[4,5-Mquinolines, hexahydropyrimido[4,5-ojquinolines, a tr >oxonexahydropyrimido[4,5-6] quinoline, an octahydropyrimido[4,5-£>]quinoline

and a tetrahydro[1,2,3]triazino[4,5-n]quinoline have been synthe-sised. A series of S-alkyltetrahydroprimido[4,5-6]quinolines was obtained by the reaction of the thioxohexahydropy-rimido[4,5-b]quinoline with allyl bromide, propargyl bromide or with epichlorohydrin. All newly synthesised compounds were characterised by IR, 1H, 13C NMR and elemental analysis.

Keywords: i\yrmmio[4,5-/?]quinolines, thioxopyrimido[4,5-/?]quinoline, triazino[4,5-/)] quinolinc and ,V-alkylprmmlo[-4,5-/?| c|iiinolines

A.Y. Abul-Magd

Nuclear Physics (2010) 1-10, Rank: A

Identification of nuclei exhibiting the SU(3) dynamical symmetry

A.Y. Abul-Magd, S.A. Mazen, M. Abdel-Mageed*, A. Al-Sayed Faculty of Science, Zagazig University, Zagazig, Egypt

ABSTRACT

We consider the possibility of identifying nuclei exhibiting the SU(3) dynamical symmetry as those having excitation energy ratio #4/2 ^ 3.25. For this purpose, we consider the level statistics of some of these nuclei and perform interacting boson model (IBM) calculation of level schemes, and electromagnetic transition rates. We show that only some of these nuclei may be considered as good examples of the SU(3) dynamical symmetry..

Keywords: Nuclear structure; Rotational nuclei; Nuclear chaos

M. El-Sayed Waheed

NTKLEONIKA , 2010, 55(3):331-338 Rank: C

Finding optimal of the Egyptian second nuclear reactor core patterns using genetic algorithm

Mohamed Kl-Sayed Wahed

Faculty of Science, Mathematics Department, Zagazig University, Egypt

W. Z. Ibrahim Atomic Energy Authority,-11351-EIelioples, Cairo, Egypt

The second Egyptian research reactor ETRR-2 went critical on the 27th of November 1997. The National Center of Nuclear Safety and Radiation Control (NCNSRC) has the responsibility of the evaluation and the assessment of the safety of this reactor.

Fuel management reloads for Egypt's second research reactor have been carried out .ux-ordirm to the fuel management scheme suggested by the reactor designer (INVAP). The start up core consists of three different fuel types, while the equilibrium core has only one fuel type called standard fuel. The fuel management scheme consists in considering the core as being partitioned into eight zones. Each one will correspond to a chain offuel movements. In each fuel cycle two of these chains will be involved, in which eight fuel elements will be moved, from them two spent fuel elements will be extracted and two fresh fuel elements will be inserted in the core. In this paper we solve a model as a one big nonlinear multi objective discrete optimization problem using genetic algorithm. Results are compared with INVAP values. Keywords: nuclear reactor • reloading* fuel management • genetic algorithm

Mathematical problems in engineering,.2010 Rank: C

Blind Deconvolution of the Aortic PressureWaveform Using the Malliavin Calculus

Ahmed S. Abutaleb,1'2 M. El-Sayed Waheed,3 and Nermeen M . Elhamy3

1Lincoln Laboratory, MIT, Lexington, USA 2Department of Biomedical Engineering and systems, Faculty of Engineering, Cairo University

3Faculty of Science, Mathematics Department, Zagazig University, Egypt

Multichannel blind Deconvolution (MBD) is .a powerful tool particularly fo the,identification and estimation of dynamical systems in which a snsor, formeasuring the input, is difficult to place. This paper presentan MBD method, basedon the Malliavin calculus MC (Stochastic calculus of variations). The arterial network Ismodeled as a Finite Impulse Response (HR) filter with unknown coefficients. The source signal central arterial pressure CAF' i' also unknown Assuming; tha t many coefficient; Of the FIR filter are time-varying, we have been able to got accurate estimation Insults for the Source signal, even though the filter order is unknown. I he time varying filter coefficients have been estimated through the pr up 'sect Ma I ha viii calculus-based method. Wehave been able to deconvolve themeasurements and obtain both the source signal and the arterial path offilter.the presented example prose the superiorly of the proposed method, as compared to conventional methods

Mathematical problems in engineering,2010 Rank: C

Multichannel Blind Deconvolution Using the StochasticCalculus for the Estimation of the Central Arterial Pressure

Ahmed S. Abutaleb1'2,M. EI-Sayed Waheed3 and Nermeen M. Elhamy3

1Lincoln Laboratory, MIT, Lexington, USA

2Department of Biomedical Engineering and systems, Faculty of Engineering, Cairo University 3Faculty of Science, Mathematics Department, Zagazig University, Egypt

A new tool for estimation of both the central arterial pressure and the unknown channel dynamicshas been developed. Given two peripheral waveform measurements, this new signal processingalgorithm generates two models that represent the distinct branch dynamic behavior associatedwith the measured signals. The framework for this methodology is based on a MultichannelBlind Deconvolution MBD technique that has been reformulated to use Stochastic CalculusSC .The technique is based on MBD of dynamic system are mathematically analyzed, in orderto reconstruct the common unobserved input within an arbitrary scale factor. The convolutionprocess is modeled as a Finite Impulse Response FIR filter with unknown coefficients. Thesource signal is also unknown. Assuming that one of the FIR filter coefficients are time varying, we have been able to get accurate estimation results for the source signal, even though thefilter order is unknown. The time varying filter coefficients have been estimated through the SCalgorithm, and we have been able to deconvolve the measurements and obtain both the sourcesignal and the convolution path. The positive results demonstrate that the SC approach is superiorto conventional methods.

1.