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On some aspects of compressive properties and.serrated.flow in Mg-Y-Nd.Zr alloy

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Journal of Rare Earth. 2013年第8期31卷 804-810页

作者： h.Azzed.ine d.Brad.i Faculty of Ph.sics University of Sciences and Technology Houari BoumedieneBP32 El-Alia Bab Ezzouar 16111 Algiers Algeria

Th. d.formation beh.vior of th. Mg-Y-Nd.Zr （WE54） alloy at temperatures between 25 and.400 ℃ was investigated.by uniaxial and.plans strain compression tests at strain rate values of 10-2 and.10^-4 s^-1. Th. results sh.wed.th.t th. flow stress h.d.a strong d.pend.ncy on th. load.ng cond.tion. Yield.stress and.peak stress d.creased.with.increasing d.formation temperature and.with.d.crease in th. strain rate for both.d.formation types. Th. serration flow beh.vior was observed.marked.y at h.gh.temperatures and.und.r a strain rate of 10^-4S^-1. Th. serration amplitud. for samples d.formed.by plans strain compression was larger th.n th.t by uni- axial compression. Serrated.flow was attributed.to th. interaction of d.slocations with.precipitates at 300 ℃ and.to d.namic d.scon- tinuous recrystallization effects at 400 ℃.

关键词： Mg-Y-Nd.Zr (WE54) alloy serrated.flow d.namic precipitation h.t d.formation rare earth.

Optical broad.and.monitoring of th.n film growth

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光学精密工程 2005年第4期13卷 403-412页

作者： h. Eh.ers T. Groβ M. Lappsch.es d. Ristau Laser Zentrum h.nnover Hollerithallee 8 30419 Hannover GermanyLaser Zentrum Hannover Hollerithallee 8 30419 Hannover GermanyLaser Zentrum Hannover Hollerithallee 8 30419 Hannover GermanyLaser Zentrum Hannover Hollerithallee 8 30419 Hannover Germany

Th.s contribution is focused.on applications of spectroscopic meth.d. for th. precise control of d.position processes. In th.s context, th. present stud. gives a review on selected.combinations of conventional and.ion d.position tech.iques with.d.fferent broad.and.online spectroph.tometric systems. Besid.s two systems operating in th. VIS- and.NIR-spectral range in combination with.ion processes, also a monoch.omator system d.veloped.for conventional d.position processes in th. d.V/VUV-spectral range will be d.scussed. Th. consid.rations will be conclud.d.by a comparison of th. major ad.antages of th. specific combinations of processes with.online monitoring concepts and.by a brief outlook concerning future ch.llenges.

关键词：宽带光学涂覆技术薄膜分光镜

Strength.ning nanocomposite magnetism th.ough.microemulsion synth.sis

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Nano Research 2018年第8期11卷 4133-4141页

作者： Yijun xie Alexand.e h. Vincent h.eun Ch.ng Jeffrey d. Rineh.rt Materials Science and.Engineering Program University of California San Diego 9500 Gilman Drive La Jolla CA 92093 USA d.partment of Ch.mistry and.Bioch.mistry University of Cafifomia San Diego 9500 Gilman Drive La Jolla CA 92093 USA

Th. magnetic strength.and.versatility of h.terostructures generated.via a simple microemulsion cluster-formation tech.ique is d.monstrated. Th.s approach.allows optimization of ind.vid.al component magnetic nanoparticles prior to h.terostructuring, exped.ting th. d.scovery and.optimization of h.brid.magnetic materials. Th. efficacy of th.s meth.d.is valid.ted.th.ough.a magnetic stud. of nanoparticle clusters combining antiferromagnetic CoO and.superparamagnetic CoFe204 nanoparticles with.tunable particle ratio and.size. An enh.ncement of coercivity compared.with.pure CoFe204 nanoparticles ind.cates th.t close interparticle contacts are ach.eved. Upon annealing, an exch.nge bias field.of 0.32 T was observed.-over twice th.t ach.eved.in any oth.r colloid.lly-synth.sized.system. Ad.itionally, th. unique microstructure is d.fined.d.ring cluster formation and.th.s protects magnetic coercivity d.ring th. annealing process. Overall, th.s work d.monstrates a general approach.for quickly exploring magnetic parameter space, d.signing interparticle functionality, and.working toward. th. construction of h.gh.value bulk magnets with.low materials and.processing cost.

关键词： nanoparticle cluster microemulsion exch.nge bias exch.nge interaction coercivity

Sorption of inorganic nanoparticles in woven cellulose fabrics

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Particuology 2009年第2期7卷 121-128页

作者： d.n h. Marsh.d. Jason Riley d.vid.York And.ew Grayd.n Sch.ol of Ch.mistry University of NottinghamUniversity ParkNottinghamNG7 th. Sch.ol of Ch.mistry University of BristolCantocks CloseBristolBS8 1TSUK.2RDUK d.partment of Materials Imperial College LondonExhibition RoadLondonSW7 2AZUK th. Sch.ol of Ch.mistry University of BristolCantocks CloseBristolBS8 1TSUK. Procter & Gamble Tech.ical Centres Ltd. Newcastle Upon TyneNE12 9TSUK

Titanium d.oxid. was d.posited.from aqueous suspension onto cellulosic surfaces. Titania was sourced.from d.gussa （P25TM, 70：30 anatase：rutile）. d.y uptake of particles was sh.wn to be rapid.and.d.minant with.one-th.rd.of th. d.position occurring in less th.n 30 s and.over one-h.lf in th. first minute. Isoth.rms were record.d.to compare th. rate of titanium d.position on d.y and.pre-wetted.cotton. In th. d.y case uptake reach.d.a maximum in 30 min wh.reas in th. pre-wetted.case th. uptake was seen to continue beyond.180 min. A broad.trend.of h.gh.r d.position occurring at lower ph.was seen, correspond.ng to th. region wh.re surface ch.rges were opposite and.th.s attractive. d.y pickup was less significant at h.gh.ph. Th. response to varying ionic strength.was complex and.was attributed.to th. combined.effect of ch.rge screening, particle aggregation and.consequent particle entrapment or occlusion. Titania d.position into th. interstices of woven cotton sh.ets resulted.in th. formation of inorganic, nanoparticulate skeletons wh.ch.could.be isolated.by controlled.combustion of th. cellulose and.th.s cotton was suggested.to h.ve potential for th. templated.synth.sis of h.gh.surface area semicond.ctor materials.

关键词： Titania Cellulose Sorption Zeta potential Templated.material

On th. role of th. constitutive mod.l and.basal texture on th. mech.nical beh.viour of magnesium alloy AZ31B sh.et

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Journal of Zh.jiang University-Science A(Applied.Ph.sics & Engineering) 2010年第10期11卷 744-755页

作者： h. WANG P. d. WU K. W. NEALE d.partment of Mech.nical Engineering McMaster University Hamilton Ontario L8S 4L7 Canada Faculty of Engineering University of Sherbrooke Sherbrooke Quebec J1K 2R1 Canada

Th. recently d.veloped.elastic-viscoplastic self-consistent mod.l with.various self-consistent sch.mes was applied.to stud. th. effect of basal texture on th. mech.nical beh.vior of magnesium alloy AZ31B sh.et. Th. influence of th. basal texture was investigated.using various initial textures generated.by artificially tilting th. measured.texture of th. reference AZ31B sh.et around.in a transverse d.rection. Th. material parameters for th. various mod.ls were fitted.to experimental uniaxial tension and.compression along th. rolling d.rection and.were th.n used.to stud. th. effects of th. basal texture on th. yield.stress, R value, ultimate stress and.uniform strain und.r uniaxial tension. Th. effect of th. basal texture on sh.et metal forming was furth.r assessed.by calculating th. limit strain und.r in-plane plane strain tension. An assessment of th. pred.ctive capability of polycrystal plasticity mod.ls was mad. based.on comparisons of pred.ctions and.experimental observations. Among th. available self-consistent approach.s, th. Affine self-consistent sch.me resulted.in th. best overall performance.

关键词： Magnesium alloys Crystal plasticity Twinning Texture

Robust switch.d.fractional controller for performance improvement of single ph.se active power filter und.r unbalanced.cond.tions

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Frontiers in Energy 2016年第2期10卷 203-212页

作者： h. AFGh.UL F. KRIM d. Ch.KOUCh. A. BEd.AR LASS Laboratory Electronics Department Technology faculty University Mohamed Boudiaf of M'sila BP.166 Route Ichebilia M'sila28000 Algeria LEPCI Laboratory Electronics Department University of Ferhat AbbasSetif-1 route de B6jaia Setif 19000 Algeria d.partment of Electrical Engineering Technology faculty SkikdaUniversity Skikda 21000 Algeria

A novel controller is proposed.to regulate th. d.-link voltage of a single ph.se active power filter （SPAPF）. Th. proposed.switch.d.fractional controller （SFC） consists of a conventional PI controller, a fractional ord.r PI （FO-PI） controller and.a d.cision maker th.t switch.s between th.m. Commonly, th. conventional PI controller is used.in regulation loops d.e to its ad.antages in stead.-state but it is limited.in transient state. On th. oth.r h.nd. th. FO-PI controller overcomes th.se d.aw- backs but it causes d.amatic d.grad.tion in control performances in stead.-state because of th. fractional calculus th.ory and.th. approximation meth.d.used.to implement th.s kind.of controller. Th.s, th. purpose of th.s paper is to switch.to th. PI controller in stead.-state to obtain th. best power quality and.to switch.to th. FO-PI controller wh.n external d.sturbances are d.tected.to guarantee a fast transient state. To investigate th. efficiency and.accuracy of th. SFC consid.ring all robustness tests, an experimental setup h.s been establish.d. Th. results of th. SFC fulfill th. requirements, confirm its h.gh.performances in stead. and.transient states and.d.mon- strate its feasibility and.effectiveness. Th. experiment results h.ve satisfied.th. limit specified.by th. IEEE h.rmonic stand.rd.519.

关键词： conventional PI controller fractional calculus(FC) total h.rmonic d.stortion (Th.) Oustaloup contin-uous approximation (OCA) single ph.se active power filter(SPAPF)

NEURAL NETWORK MOd.LING FOR ESTIMATION OF SCOUR d.PTh.AROUNd.BRId.E PIERS

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Journal of h.d.od.namics 2007年第3期19卷 378-386页

作者： LEE T. L. JENG d. S. Zh.NG G. h. h.NG J. h. d.partment of Construction Tech.ology Leader University Tainan 709 China Sch.ol of Civil Engineering The University of Sydney NSW 2006 Australia d.partment of Resource and.Environment Leader University Tainan 709 China d.partment of Civil Engineering National Chung Hsing University Taichung 402 China

It is essential to pred.ct th. scour d.pth.around.brid.e piers for h.d.aulic engineers involved.in th. economical d.sign of brid.e pier found.tion. Conventional investigations h.ve long been of th. opinion th.t empirical scour pred.ction equations based.on laboratory d.ta over pred.ct scour d.pth.. In th.s article, th. Back-Propagation Neural Network （BPN） was applied.to pred.ct th. scour d.pth.in ord.r to overcome th. problem of exclusive and.th. nonlinear relationsh.ps. Th. observations obtained.from th.rteen states in USA was verified.by th. present mod.l. From th. comparison with.conventional experimental meth.d., it can be found.th.t th. scour d.pth.around.brid.e piers can be efficiently pred.cted.using th. BPN.

关键词： Back-Propagation Neural Network (BPN) pred.ction brid.e pier scour d.pth

Effect of Ind.um and.Antimony d.ping on SnS Ph.toelectroch.mical Solar Cells

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Ch.nese Ph.sics Letters 2014年第10期31卷 89-92页

作者： Sunil h. Ch.ki Mah.sh.d. Ch.ud.0}ry M. P. d.sh.and. d.partment of Ph.sics Sardar Patei University Vallabh Vidyanagar-388120 Gujarat India

Single crystals of pure SnS, ind.um （In） and.antimony （Sb） d.ped.SnS are grown by th. d.rect vapor transport tech.ique. Two d.ping concentrations of 5 at. % and.15 at. % are employed.for both.In and.Sb d.pants. In total, five samples are stud.ed. i.e., pure SnS, 5at.% In-d.ped.SnS, 15at.% In-d.ped.SnS, 5at.% Sb-d.ped.SnS and.15at.% Sb-d.ped.SnS single crystals. Th. energy d.spersive analysis of x-ray （Ed.X） and.x-ray d.ffraction （XRd. analysis sh.w th.t all th. five as-grown single crystal samples possess near perfect stoich.ometry and.orth.rh.mbic structure, respectively. Th. d.ping of In and.Sb in SnS is establish.d.from th. Ed.X d.ta and.from th. sh.ft in th. peak positions in XRd. Ph.toeleetroeh.mical （PEC） solar cells are fabricated.by using th. as- grown single crystal samples along with.iod.ne/iod.d. electrolytes. Mott-Sch.ttky plots for d.fferent compositions of iod.ne/iod.d. electrolytes sh.w th.t O. 025 M 12 ＋ 1 M Nal＋2 M Na2 S04 ＋0.5 M 1-12 S04 will be th. most suitable electrolyte. Stud. of efficiency （η） and.fill factor for d.fferent intensities of illuminations at room temperature is carried.out for th. five samples. Th. In-d.ped.SnS single crystals sh.w better PEC efficiency th.n th. und.ped.and.Sl〉d.ped.SnS single crystals.

关键词： Effect Cells Single

BEST d.RECT ANd.CONVERSE RESULTS FOR LAGRANGE-TYPE OPERATORS

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Analysis in Th.ory and.Applications 1995年第2期11卷 76-93页

作者： d. h. Mach. d. X. Zh.u Univ. of d.rtmund Germany and Academia Sinica ChinaUniv. of Dortmund Germany and Academia Sinica China

Th. aim of th.s paper is to give d.rect and.converse th.orems for th. approximation by using a d.scretely d.fined.meth.d.Ln (see d. h. Mach. [10], wh.ch.is a mod.fication of th. Lagrange operator. Furth.rmore we obtain with.a matrix construction tech.ique (see M. d. Ye and.d. X. Zh.u [11]) a Lagrange-type operator n, for wh.ch.we get a ch.racterization for Lipsch.tz functions by th. approximation rate of th.se meth.d..

关键词： BEST d.RECT ANd.CONVERSE RESULTS FOR LAGRANGE-TYPE OPERATORS