学科分类
/ 13
245 个结果
  • 简介:AmeshlessapproachtoanalysisofarbitraryKirchhoffplatesbythelocalboundaryintegralequation(LBIE)methodispresented.Themethodcombinestheadvantageousfeaturesofallthethreemeth-ods:theGalerkinfiniteelementmethod(GFEM),theboundaryelementmethod(BEM)andtheelement-freeGalerkinmethod(EFGM).Itisatrulymeshlessmethod,whichmeansthatthediscretizationisinde-pendentofgeometricsubdivisionintoelementsorcells,butisonlybasedonasetofnodes(orderedorscat-tered)overadomaininquestion.Itinvolvesonlyboundaryintegration,however,overalocalboundarycen-teredatthenodeinquestion;Itposesnodifficultiesinsatisfyingtheessentialboundaryconditionswhileleadingtobandedandsparsesystemmatricesusingthemovingleastsquare(MLS)approximations.Itisshownthathighaccuracycanbeachievedforarbitrarygeometriesforclampedandsimply-supportededgeconditions.Themethodisfoundtobesimple,efficient,andattractive.

  • 标签: THIN plate local boundary INTEGRAL equation
  • 简介:Thestabilityofthethinliquidfilminacapillaryisimportanttothephase-changeheattransferprocessinminiatureofmicrostructures.Fromthebasicequationsformotionandheattransferattheinterfaceofthefilm,itsstabilityistheoreticallystudied.Withevaluationoftheeffectsandrelativemagnitudesofvariousdrivingforcesandwiththeuseoflong-wavetheoryinadditiontolinearstabilityanalysis,thecontrollingequationsaresimplifiedandanevolutionequationforthefilm'sthicknessisobtained.Detailedanalysisontheevolutionequationshowsthatinstabilityoccursfirstinthemeniscusregionandtheinstabilityconditionvarieswithboundaryconditions,geometricalscalesandthermalproperties.Thenumericalresultsagreewellwithearlieroneswithsomefavorableextensionsandimprovements.

  • 标签: 相变 毛细管 液体薄膜 稳定性
  • 简介:Theeffectofdiffusiononthermoelasticthinplatesisinvestigated.Thegoverningequationsforthinthermoelasticdiffusionplatesunderthreedifferentlawsofheatanddiffusiontransmissionarederived.BytheC0-semigrouptheory,thewell-posednessoftheproposedequationsisshown.

  • 标签:
  • 简介:ItiswellknownthatthephotocatalyticactivityofTiO2thinfilmsstronglydependsonthepreparingmethodsandpost-treatmentconditions,sincetheyhaveadecisiveinfluenceonthechemicalandphysicalpropertiesofTiO2thinfilms.Therefore,itisnecessarytoelucidatetheinfluenceofthepreparationprocessandpost-treatmentconditionsonthephotocatalyticactivityandsurfacemicrostructuresofthefilms.ThisreviewdealswiththepreparationofTiO2thinfilmphotocatalystsbywet-chemicalmethods(suchassol-gel,reversemicellarandliquidphasedeposition)andthecomparisonofvariouspreparationmethodsaswellastheiradvantageanddisadvantage.Furthermore,itisdiscussedthattheadvancementofphotocatalyticactivity,super-hydrophilicityandbactericidalactivityofTiO2thinfilmphotocatalystinrecentyears.

  • 标签: TIO2薄膜 光催化剂 光催化活性 溶胶-凝胶方法 液相沉积方法 亲水性
  • 简介:Theelectroluminescencethinfilmsdopedwitherbium,fabricatedbythermalevaporationwithtwoboats,areanalyzedbyX-raydiffraction(XRD).Therelationshipbetweenelectroluminescencebrightnessandmicrostructureofthethinfilmsisobtained.Theresultsrevealthatthelargegrainsizeinhighindexplaneofdepositedmicrocrystallinefilmhasaneffectonelectroluminescencecharacteristicsofthefilmdevices.

  • 标签: 场致发光 ZNS薄膜 微结构 红外线衍射 XRD
  • 简介:Effectsofdepositionlayerpositionandnumber/densityonlocalbendingofathinfilmaresystematicallyinvestigated.Becausethedepositionlayerinteractswiththethinfilmattheinterfaceandthereisanoffsetbetweenthethinfilmneutralsurfaceandtheinterface,thedepositionlayergeneratesnotonlyaxialstressbutalsobendingmoment.Thebendingmomentinducesaninstantout-of-planedeflectionofthethinfilm,whichmayormaynotcausethesocalledlocalbending.Thedepositionlayerismodeledasalocalstressor,whoselocationanddensityaredemonstratedtobevitaltotheoccurrenceoflocalbending.Thethinfilmrestsonaviscouslayer,whichisgovernedbytheNavier-Stokesequationandbehaveslikeanelasticfoundationtoexerttransverseforcesonthethinfilm.Theunknownfeatureoftheaxialconstraintforcemakesthegoverningequationhighlynonlinearevenforthesmalldeflectioncase.Theconstraintforceandfilmtransversedeflectionaresolvediterativelythroughthegoverningequationandthedisplacementconstraintequationofimmovableedges.Thisresearchshowsthatinsomespecialcases,thedepositiondensityincreasedoesnotnecessarilyreducethelocalbending.Bycomparingthethinfilmdeflectionsofdifferentdepositionnumbersandpositions,wealsopresenttheguidelineofstrengtheningorsuppressingthelocalbending.

  • 标签: 薄膜表面 局部弯曲 粘性 轴向压力 挠度方程 交互界面
  • 简介:Thebucklingofthingelfilmhasattractedmuchattentionduetoitsapplicationsinthedesignofthreedimensionalstructurefromtwo-dimensionaltemplate.Wehaveestablishedananalyticalmodeltostudytheswelling-inducedbucklingofathingelstripwithoneedgeclampecdandtheothersfree.Theclosed-formsolutionsfortheamplitudeandwavelengthofthebuckledshapeareobtainedbyenergyminimizationofthetotalpotentialenergy.Theanalyticalresultsagreewellwithfiniteelementanalysisbasedontheinhomogeneousgeltheorywithoutanyparameterfitting.Themodelprovidesaroutetostudycomplexpostbucklingbehaviorsofthingelfilmsandguidelinestodesignthebuckledconfigurationquantitativelybycontrollingtheswellingratio.

  • 标签: 屈曲行为 膨胀率 胶条 模板设计 解析模型 能量最小化
  • 简介:Nasiconthinfilmsof15μmthickonYSZsub-strateswerepreparedbymeansofsolidstatereactionat1230℃for10hours,Stucturalcharacteriza-tionofthefilmswereperformedbyXRD,SEMandEDX,AnewtyypeofCO2gassensorwithNasiconthinfilmassolidelectrolytewasdeveloped.

  • 标签: 固态离子 薄层 结构 固体电解质电池 机械加工 氧化铝
  • 简介:有共面的波导(CPW)的电影组织的使小型化的传播者使用钡铁酸盐被高频率基于有限元素方法设计并且优化电磁的地模拟。电影传播者的最好的发行量表演基于10m厚钡铁酸盐薄电影在36.9GHz附近与0.13dB和22.89dB的隔离的插入损失被获得。有CPW的电影传播者和有地面(CPWG)的CPW的微波特征组织被比较了。在地面和信号线之间的差距的影响,和微波性质上的铁磁性的回声线宽度也被学习。

  • 标签: 钡铁氧体薄膜 共面波导 环行 循环性能 有限元方法 高频电磁场
  • 简介:Thepreparation,currentstatusandtrendsareinvestigatedforsiliconthinfilmsolarcells.Theadvantagesanddisadvantagesofamorphoussiliconthinfilm,polycrystallinesiliconthinfilmandmono-crystallinesiliconthinfilmsolarcellsarecompared.Thefuturedevelopmenttrendsarepointedout.Itisfoundthatpolycrystallinesiliconthinfilmsolarcellswillbemorepromisingforapplicationwithgreatpotential.

  • 标签: 硅薄膜 太阳能电池 基片 多晶硅
  • 简介:Inthispaper,anumericalmodelof2Dweaklycompressiblesmoothedparticlehydrodynamics(WCSPH)isdevelopedtosimulatetheinteractionbetweenwavesandthinstructures.Anewcolordomainparticle(CDP)techniqueisproposedtoovercomedifficultiesofapplyingtheghostparticlemethodtothinstructuresindealingwithsolidboundaries.Thenewtechniquecandealwithzero-thicknessstructures.Toapplythisenforcingtechnique,thecomputationalfluiddomainisdividedintosubdomains,i.e.,boundarydomainsandinternaldomains.Acolorvalueisassignedtoeachparticle,andcontainstheinformationofthedomainsinwhichtheparticlebelongstoandtheparticlescaninteractwith.Aparticle,nearbyathinboundary,ispreventedfrominteractingwithparticles,whichshouldnotinteractwithontheothersideofthestructure.Itispossibletomodelthinstructures,orthestructureswiththethicknessnegligiblewiththistechnique.TheproposedWCSPHmoduleisvalidatedforastillwatertank,dividedbyathinplateatthemiddlesection,withdifferentwaterlevelsinthesubdomains,andisappliedtosimulatetheinteractionbetweenregularwavesandaperforatedverticalplate.Finally,thecomputationiscarriedoutforwavesandsubmergedtwin-horizontalplateinteraction.Itisshownthatthenumericalresultsagreewellwithexperimentaldataintermsofthepressuredistribution,pressuretimeseriesandwavetransmission.

  • 标签: SPH CDP THIN plate wave–structure INTERACTION
  • 简介:我们为达到块共聚物(BCP)的底部形态学表明一条一般途径薄电影。在我们PS-b-PMMA电影上的以前的大小,BCP电影的表面形态学地图揭示了在哪儿的不同订的政体对接口和这些形态学共存的中间的政体主要垂直或平行的柱体东方。然而,这个更早的工作没探索BCP薄电影的底部形态学。在这研究,我们在在表面上有垂直柱体形态学的演员组块共聚物电影在稳固的底层附近调查了块共聚物形态学。

  • 标签: 下线 服务 迁移
  • 简介:Inthispaper,thespin-coatedthinfilmsofphthalocyaninedyearepresented.Absorptionspectrumofthethinfilmshowsacomparativelybroadabsorptioninthewavelengthrange630-770nm.Opticalparametersofthethinfilmweremeasuredbyaspectroscopicellipsometersystem.5-inCD-RdiscsmadeofthisdyeexhibitgoodperformancewithYamaha20-speedrecorder.Jittersoflandandpitarelessthan30ns,andthe3T-11T'ssignalsshowverygoodquality.ThisdyeisapromisingrecordingmediumforCD-Rwithmuchhigherrecordingspeed.

  • 标签: 有机染料激光器 酞花青染料 薄膜
  • 简介:AnalyzedandstudiedthecharactersofhighstrengthlowalloysteelwhichcontainMo,Cr,NbandNi.etc.Followingactualrolling,combiningthefeatureofrollingmode,andexploitingtheequipmentadvantageof5mHeavyPlateMill,optimizedthematerialdesign,heatingtemperatureandrollingmethod,stabilizedrollingprocessofthinalloyedsteel,thequalityindexwasadvanced.

  • 标签:
  • 简介:Asimplesetupforthemeasurementoftransmissionlossinpolymerthinfilmopticalwaveguidesisdescribed.Anewelectro-opticpolymerfilmhasbeenprepared.Thetransmissionlossofthefilmismeasuredbeforeandaftercoronapoling.Andthelossisdeterminedtobe1.84dB/cmand2.14dB/cm,respectively.

  • 标签: 损耗测量 光波导 聚合物薄膜 非线性光纤 NLO
  • 简介:Photovoltaicsarecurrentlyrecognizedasatoprankingtechnologyamongthenewenergies.Photovoltaicshavethepotentialtoeventuallymakeaconsiderablecontributiontothepowergenerationcapacityintheworl,especially,intheindustrializedcoutries.GoodaccomplishmenthasbeenobtainedinthecostreductionofPVsystems,forexamplein1974,systemscost(100-150)$/W.In1981,suchsystemscostlessthan(10-30)$/W,andnowtheycostlessthan5$/W.However,moreR&Deffortsarestillnecessary,toachievelarge-scalecost-effectiveprouctionofPVsystemstomakeitcompetitivewithdieselgenerationofelectricity,althoughPVsystemshaveproventobecompetitiveinruralandremoteareas.Inthispaper,anoverviewonhighefficiencysolarcelltechnologicswilllbepresented.

  • 标签: 半导体 太阳能电池 薄膜