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Effects of acetic acid on m.crostructure and electroch.m.cal properties of nano cerium.oxide film. coated on AA7020-T6 alum.num.alloy

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Rare m.tals 2009年第1期28卷 98-101页

作者： h. h.sannejad T. Sh.h.abi m. Aliofkh.zraei m.terials Engineering Departm.nt Faculty of EngineeringTarbiat Modares UniversityTehranIran

Nano cerium.oxide film. were applied on AA7020-T6 alum.num.alloy and th. effects of acetic acid concentration on th. m.crostructure and electroch.m.cal properties of th. coated sam.les were investigated by using scanning electron m.croscopy （SEm., X-ray diffraction （XRD）, and potentiodynam.c polarization m.th.ds. It h.s been found th.t by increasing th. acetic acid/CeCl3·7h.O m.lar ratio, h.gh.uniform.and crack-free film. with.well-developed grains were obtained and grain sizes of th. film. decreased. elim.nation of cracks and decreasing grain size of th. nano cerium.oxide film. caused corrosion resistance to increase.

关键词： nano cerium.oxide film. acetic acid alum.num.alloy electroch.m.cal property m.crostructure

Copper biosorption on im.obilized seaweed biom.ss:Colum. breakth.ough.ch.racteristics

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Journal of Environm.ntal Sciences 2007年第8期19卷 928-932页

作者： K. h. Ch. m. A. h.sh.m h.neywell Process Solutions 17 Changi Business Park Central 1 Singapore 486073. Departm.nt of Ch.m.cal Engineering University of Malaya 50603 Kuala Lumpur Malaysia

Th. biosorption of copper by th. brown seaweed Sargassum.baccularia, im.obilized onto polyvinyl alcoh.l （PVA） gel beads, was investigated with.fixed-bed experim.nts. Laboratory-scale colum. tests were perform.d to determ.ne breakth.ough.curves with.varying flow rates and feed concentrations. A th.oretical fixed-bed m.del, known as th. Boh.rt-Adam. equation, was evaluated in sim.lating th. experim.ntal breakth.ough.curves. Th. Boh.rt-Adam. m.del qualitatively predicted th. breakth.ough.trends. PVA- im.obilized seaweed biom.ss beads were am.nable to efficient regeneration with.aqueous solution containing th. ch.lating agent eth.lenediam.netetraacetic acid （EDTA）. Th. biosorbent retained m.st of its original uptake capacity over th.ee cycles of use. Th. excellent reusability of th. biosorbent could lead to th. developm.nt of a viable m.tal rem.diation tech.ology.

关键词： adsorption biosorption fixed bed im.obilized algae polyvinyl alcoh.l

Ch.racterization of refractory beh.viour of com.lex gold/silver ore by diagnostic leach.ng

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中国有色金属学会会刊：英文版 2009年第3期19卷 707-713页

作者： O. CelEP . ALP h. DEVEC m. VICIL m.ning Engineering Departm.nt Karadeniz Technical University Geology Engineering Departm.nt Karadeniz Technical University

Th. am.nability of a refractory ore to th. extraction of gold and silver by cyanide leach.ng was investigated. Diagnostic leach.ng tests were also perform.d to sh.d ligh. on th. refractory ch.racteristics of ore. Th. leach.ng tests sh.w th.t th. extraction of gold and silver is consistently low, i.e. ≤47% and ≤19.2%, respectively, over a leach.ng period of 24 h. Even fine grinding (e.g. m. does not im.rove th. recovery of gold and silver. Diagnostic leach.ng approach.provides inform.tion into th. cause of th. refractoriness of th. ore. Th. findings suggest th.t th. refractoriness is induced by th. dissem.nation and encapsulation of th. very fine gold and silver particles largely in th. carbonates, oxides and sulfides and, to a sm.ll extent, with.silicates present in th. ore m.trix. Th.se findings h.gh.igh. th. practical im.ortance of diagnostic leach.ng for th. understanding of th. refractory ch.racteristic of such.an ore and for th. identification of possible pretreatm.nt options to overcom. its refractoriness prior to cyanide leach.ng.

关键词：氰化浸出银矿石黄金诊断行为表征浸出试验硅酸盐矿石

KINETIC m.DelING OF ESTERIFICATION OF EPOXY RESIN IN Th. PRESENCE OF TRIPh.NYLPh.SPh.NE FOR PRODUCING VINYL ESTER RESIN: m.Ch.NISTIC RATE EQUATION

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Ch.nese Journal of Polym.r Science 2006年第6期24卷 599-608页

作者： m. Rafizadeh.h. Gh.sem. V. h.ddadi-Asl Polym.r Engineering Departm.nt Amirkabir University of TechnologyP. O. Box 15785-4414TehranIran

Due to its m.ch.nical properties and ease of use, vinyl ester resin is enjoying increasing consideration. Th.s resin norm.lly is produced by reaction between epoxy resin and unsaturated carboxylic acid. In th. present study, bis-ph.nol A based epoxy resin and m.th.crylic acid was used to produce vinyl ester resin. Th. reaction was conducted under both.stoich.om.tric and non-stoich.om.tric conditions in th. presence of triph.nylph.sph.ne as catalyst. Th. stoich.om.tric and non-stoich.om.tric experim.nts were conducted at 95, 100, 105 and 110℃ and at 90 and 95℃, respectively. Th. first order rate equation and m.ch.nism.based rate equation were exam.ned. Param.ters are evaluated by least square m.th.d. A com.arison of m.ch.nism.based rate equation and experim.ntal data sh.w an excellent agreem.nt. Finally, Arrh.nius equation and activation energy were presented.

关键词： Esterification Epoxy resin Vinyl ester resin Kinetic Rate equation.

Vibration suppression of m.gnetostrictive lam.nated beam. resting on viscoelastic foundation

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Applied m.th.m.tics and m.ch.nics(English.Edition) 2020年第8期41卷 1269-1286页

作者： A.m.ZENKOUR h.D.el-Sh.h.ANY Departm.nt of m.th.m.tics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia Departm.nt of m.th.m.tics Faculty of ScienceKafrelsheikh UniversityKafrelsheikh 33516Egypt Departm.nt of m.th.m.tics Faculty of ScienceBisha UniversityBisha 61922Saudi Arabia

Th. vibration suppression analysis of a sim.ly-supported lam.nated com.osite beam.with.m.gnetostrictive layers resting on visco-Pasternak’s foundation is *** constant gain distributed controller of th. velocity feedback is utilized for th. purpose of vibration *** form.lation of displacem.nt field is proposed according to Euler-Bernoulli’s classical beam.th.ory(ECBT),Tim.sh.nko’s first-order beam.th.ory(TFBT),Reddy’s th.rd-order sh.ar deform.tion beam.th.ory,and th. sim.le sinusoidal sh.ar deform.tion beam.***’s principle is utilized to give th. equations of m.tion and th.n to describe th. vibration of th. current *** on Navier’s approach.th. solution of th. dynam.c system.is *** effects of th. m.terial properties,th. m.des,th. th.ckness ratios,th. lam.nation sch.m.s,th. m.gnitudes of th. feedback coefficient,th. position of m.gnetostrictive layers at th. structure,and th. foundation m.dules are extensively studied and discussed.

关键词： vibration suppression lam.nated com.osite beam m.gnetostrictive m.terial visco-Pasternak’s foundation

Ph.sical and geom.trical param.ters of CVBS Ⅺ: Cou 1511(h.P 12552)

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Research.in Astronom. and Astroph.sics 2016年第11期16卷 13-18页

作者： m.sh.oor A. Al-Wardat m.h.m.ad h. el-m.h.m.ed Nih.d A. Yusuf Awni m. Kh.sawneh.Suh.il G. m.sda Ph.sics Departm.nt A1 al-Bayt University PO Box: 130040 Mafraq 25113 Jordan Departm.nt of Ph.sics A1-Hussein Bin Talal University Maan 71111 Jordan Departm.nt of Ph.sics Yarmouk University Irbid 21163 Jordan King Abdullah.I Sch.ol for Graduate Studies and Scientific Research Princess Sumaya University for Technology PO Box 1438 Amman 11941 Jordan Royal Jordanian Geograph.c Center Amman 11941 Jordan Astroph.sikalisch.s Institut und Universitaits-Sternwarte Jena FSU Jena 07745 Jena Germany

m.del atm.sph.res of th. close visual binary star Cou 1511 （h.P 12552） are constructed using grids of Kuruz＇s blanketed m.dels to build th. individual synth.tic spectral energy distributions （SEDs） for both.com.onents. Th.se synth.tic SEDs are com.ined togeth.r for th. entire system.and com.ared with.th. observational one following A1-Wardat＇s com.lex m.th.d for analyzing close visual binary stars. Th. entire observational SED of th. system.is used as a reference for com.arison between th. synth.tic SED and th. observed one. Th. param.ters of both.com.onents are derived as： Teff = 6180 4- 50 K, Tebfr = 5865 ＋ 70 K, log 9a = 4.35 ± 0.12, log 9b = 4.45± 0.14, Ra = 1.262 ± 0.08 R⊙^eff, Rb = 1.006 ± 0.07 R⊙^ett, La = 2.09 -4- 0.10 L⊙ and Lb = 1.08 ± 0.12 L⊙, with.spectral types F8V and G1.5V for com.onents （a, b） respectively and age of 3.0 ± 0.9 Gyr. A m.dified orbit of th. system.is built and th. m.sses of th. two com.onents are calculated as m. = 1.17 ±0.11 m. and m. = 1.06 ± 0.10 m..

关键词： binaries -- visual stars -- fundam.ntal param.ters stars -- Cou 1511 (h.p 12552)

Study of Th.ee Different Types of Plasm. Ion Sources

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Plasm. Science and Tech.ology 2009年第5期11卷 604-608页

作者： m.m.ABDelRAh.AN h.el-Kh.BEARy Accelerators & Ion Sources Departm.nt Nuclear Research CenterAtomic Energy Authority

Th.ee types of plasm. ion sources designed, m.nufactured and optim.zed in th. Accelerators and Ion Sources Departm.nt, Nuclear Research.Center, Atom.c Energy Auth.rity are introduced. Different m.ans were investigated to generate th. disch.rge current and ion beam.current extracted from.th. plasm.. Th. various plasm.s described include a DC glow disch.rge plasm., an arc disch.rge plasm. and a radio frequency disch.rge plasm..

关键词： ion sources ionization processes sputtering and etch.ng processes

Effect of Conductive Fillers on th. Cyclic Stress-Strain and Nano-Scale Free Volum. Properties of Silicone Rubber

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Ch.nese Journal of Polym.r Science 2014年第5期32卷 558-567页

作者： m.h.Abd-el Salam.S.el-Gam.l m.m.h.en D.m.Abd el-m.qsoud Ph.sics Departm.nt Faculty of Education Ain Shams University Ph.sics Departm.nt Faculty of Science Ain Shams University

Th. effect of carbon black （CB） and graph.te （G） powders on th. m.croscopic and nano-scale free volum. properties of silicone rubber based on poly（di-m.th.lsiloxane）（PDm.） was studied th.ough.th.rm.l and cyclic m.ch.nical m.asurem.nts, as well as with.positron annih.lation lifetim. spectroscopy （PALS）. Th. m.lting tem.erature of th. com.osites （Tm. and th. endoth.rm.c enth.lpy of m.lting （Δh.） were estim.ted by differential scanning calorim.try （DSC）. Tm.and th. degree of crystallinity （χc） of PDm. com.osites were found to decrease with.increasing th. CB content. Th.s can be explained due to th. increase in ph.sical cross-linking wh.ch.results in a decrease in th. crystallite th.ckness. Besides, χc was found to be dependent on th. filler type. Cyclic stress-strain beh.vior of PDm. loaded with.different contents of filler h.s been studied. m.llins ratio （Rm. was found to be dependent on th. filler type and content. It was found th.t, Rm.increases with.increasing th. filler content due to th. increase in ph.sical cross-linking wh.ch.results in a decrease in th. size of free volum., as observed th.ough.a decrease of th. o-Ps lifetim. τ3 m.asured by PALS. m.reover, th. h.steresis in PDm.-CB com.osites was m.re pronounced th.n in PDm.-G com.osites. Furth.rm.re, a correlation was establish.d between th. free volum. Vf and th. m.ch.nical properties of PDm. com.osites containing different fillers. A negative correlation was observed between Vf and Rm.

关键词： Positron annih.lation Positronium Free volum. Si-rubber Com.osite Cyclic m.ch.nical properties.

Effects of th.rm.l boundary conditions on th. joule h.ating of electrolyte in a m.croch.nnel

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Journal of h.drodynam.cs 2016年第5期28卷 850-862页

作者： m. Y. ABDOLLAh.ADEh.JAm.LABADI J. h. PARK m. m. RASh.DI J. m. Ch.N Departm.nt of Sh.p Engineering Chabahar Maritime University Chabahar Iran Departm.nt of Aerospace and System.Engineering Gyeongsang National University Jinju Korea . Engineering Faculty of Bu-Ali Sina University Hamedan Iran Departm.nt of m.ch.nical and Nuclear Engineering Kansas State University Manhattan USA

Joule h.ating effects on a slit m.croch.rm.l filled with.electrolytes are com.reh.nsively investigated with.em.h.sis on th. th.rm.l boundary conditions. An accurate analytical expression is proposed for th. electrical field and th. tem.erature distributions due to Joule h.ating are num.rically obtained from.th. energy balance equation. Th. results sh.w th.t a th.rm.l design based on th. average electric potential difference between electrodes can cause severe underestim.tion of Joule h.ating. In addition, th. param.- tric study of th.rm.l boundary conditions gives us an insigh. into th. best cooling scenario for m.crofluidic devices. Oth.r significant th.rm.l ch.racteristics, including Nusselt num.er, th.rm.ph.retic force, and entropy generation, are discussed as well. Th.s study will provide useful inform.tion for th. optim.zation of a biom.m. device in relation to th. th.rm.l aspect.

关键词： m.croch.nnel electrolyte joule h.ating Nusselt num.er th.rm.ph.retic force entropy generation optim.zed th.rm.ldesign