学科分类
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249 个结果
  • 简介:为网络交通,WPANFIS,它为多决定分析依靠小浪包变换(WPT)和适应neuro模糊的推理系统(ANFIS)的预言的新奇方法论在这篇文章被建议。在网络交通的自我类似的普遍存在在更早的研究被表明了,它展出长期的依赖(LRD)和短范围依赖(SRD)。另外,小浪分解是为LRDdecorrelation的一个有效工具,这被显示出。新方法把WPT用作装decoorrelateLRD并且让更多精确在原来的交通的高周波的节划分的小浪变换的扩展。然后,能从原来的交通提取有用信息的ANFIS为每个分解非静止的小浪系数的更好的预言性能在这研究被实现。模拟结果证明建议WPANFIS能在真实网络交通环境完成高预言精确性。

  • 标签: 网络流量预测 模糊神经网络 多分辨率分析 自适应神经模糊推理系统 自相似网络流量 ANFIS
  • 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