简介：Effectofvelocityjumpandtemperaturejumpontheheatandmomentumtransferinmicro-domainsisdiscussedindetail.Asimulationaidedbylocallyfullydevelopedassumptionisdevelopedtoexplaintheexperimentalresultsdifferentfromthosepredictedbyconventionaltheory.Heattransferinmicro-channelsundertheuniformheatfluxisalsoanalyzed.Itisfoundthatvelocity-jumpandtemperature-jumphaveanoppositeinfluenceandNusseltnumberhasagreatervaluewhentheKnudsennumberisverysmall,WiththeincreasingofKnudsenNumber,Nussqltnumberbecamesmallerthan8.24.

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简介：这份报纸报导巨浪的试验性、理论的学习发生在原型一台极端微离心的压缩机。作为第一步，10次缩放有40公里的一台极端微离心的压缩机的模型外部直径被设计并且生产。为有B参数的几不同价值的巨浪的短暂行为的详细试验性的调查被执行。试验性的结果在巨浪期间与非线性的lumped参数理论获得以便为微离心的压缩机验证理论巨浪模型的有效性的那些相比。作为结果，巨浪的相当不同的行为在实验并且在分析为B的不同价值出现了。关键词微离心的压缩机-澎湃-lumped参数模型CLC数字TK474.8+2

简介：点火的分叉分析和催化燃烧在的扑灭一突然微隧道被执行，laminar模型作为流动模型合并了。横向的Thiele模量和滞留时间的平方被用作分叉参数。点火和扑灭行为上的不同参数的影响被调查。所有这些参数在点火和扑灭的分叉行为上有大效果在，这被显示出突然微隧道。燃烧的分叉行为上的流动模型的效果也被分析。结果证明与扁平的速度侧面模型比较，为laminar模型的案例，点火的温度和燃烧的扑灭更高，不稳定的多重答案区域更大。

简介：Thispaperdescribestheuseofoverlappinggridsforthecalculationofflowaroundsingleandmultiple-particleconfigurationsatthemicroscale.ThebasicequationsforcalculationarethoseforconservationofmassandmomentumwhicharesolvedusingacommonFinite-Volumeformulation.Thehydrodynamicparticle-particleandparticle-wallinteractioncanbecalculatedbyusinganoverlappingorChimeragridscheme.Withthegridstructuringprocedureitispossibletousesimpleandstructuredgridsaroundtheparticlesandtheoverallmaingridgeometry.Theparticlegridsarelappedoverthemaingridsuchthattheycanmoveindependentlyaftereachtimestepwithoutremeshingthewholegeometry.Thepapergivesresultsforthevalidationofthecodedevelopedforgeneraltestcases,forarotatingellipsoidinsimpleshearflow,theflowaroundparticlesattachedtoawall,themotionofaparticleinthevicinityofawallandsomeresultsfortheflowthroughapackedbedconfiguration.

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简介：Weinvestigatethedynamiccrystallizationprocessesofcolloidalphotoniccrystals,whicharepotentiallyinvaluableforsolvinganumberofexistingandemergingtechnicalproblemsinregardstocontrolledfabricationofcrystals,suchassizenormalization,stabilityimprovement,andaccelerationofsynthesis.Inthispaper,wereportsystematichigh-resolutionopticalobservationofthespontaneouscrystallizationofmonodispersepolystyrene(PS)micro-spheresinaqueoussolutionintoclose-packedarraysinastaticlineopticaltweezers.Theexperimentsdemonstratethatthecrystalstructureismainlyaffectedbytheminimumpotentialenergyofthesystem;however,thecrystallizationdynamicscouldbeaffectedbyvariousmechanical,physical,andgeometricfactors.Thecomplicateddynamictransformationprocessfrom1Dcrystallizationto2Dcrystallizationandthecreationandannihilationofdislocationsanddefectsviacrystalrelaxationareclearlyillustrated.Twomajorcrystalgrowthmodes,theepitaxygrowthpatternandtheinsertedgrowthpattern,havebeenidentifiedtoplayakeyroleinshapingthedynamicsofthe1Dand2Dcrystallizationprocess.Theseobservationsofferinvaluableinsightsforin-depthresearchaboutcolloidalcrystalcrystallization.

简介：在这篇论文，表演和传统的类型的声学的噪音，微多片扇子试验性地并且数字地被调查，到为居民情形优化扇子的说明。声学的噪音水平减少，但是效率随impeller的片数字的增加稍微败坏。而且，声学的噪音随在impeller插头和涡囊舌头之间的距离的增加减少，在随输入的增加和扇子效率的恶化伴随。

简介：U-shapedmicro-nanochannelscangeneratesignificantflowdisturbanceaswellaslocallyamplifiedelectricfield,whichgivesitselfpotentialtobemicrofluidicmixers,electrokineticpumps,andevencelllysisprocess.NumericalsimulationisutilizedinthisworktostudythehiddencharacteristicsoftheU-shapedmicro-nanochannelsystem,andtheeffectsofkeycontrollingparameters(theexternalvoltageandpressure)onthedeviceoutputmetrics(current,maximumvaluesofelectricfield,shearstressandflowvelocity)wereevaluated.Alargeportionofcurrentflowingthroughthewholesystemgoesthroughthenanochannels,ratherthanthemiddlepartofthemicrochannel,withitsvalueincreasinglinearlywiththeincreaseofvoltage.Duetothelocaliondepletionnearmicro-nanofluidicjunction,significantlyenhancedelectricfield(asmuchas15foldatV=1VandP0=0)aswellasstrongshearstress(leadingtoelectrokineticflow)isgenerated.Withincreasingexternalpressure,bothelectricfieldandshearstresscanbeincreasedinitially(duetoshorteningofdepletionregionlength),butaresuppressedeventuallyathigherpressureduetothedestructionofiondepletionlayer.Insightsgainedfromthisstudycouldbeusefulfordesigningnonlinearelectrokineticpumpsandothersystems.

简介：Theload-bearingcapacitiesofduclilecompositematerialsandstructuresarestudiedbymeansofacombinedmicro/macromechanicsapproach.Firstly,onthemicroscopicscale,theaimistogetthemacroscopicstrengthdomainsbymeansofthehomogenizationtheoryofmicromechanics.Arepresentativevolumeelement(RVE)isselectedtoreflectthemicrostructuresofthecompositematerials.Byintroducingthehomogenizationtheoryintothekinematiclimittheoremofplasticlimitanalysis,anoptimizationformaltodirectlycalculatethelimitloadsoftheRVEisobtained.Andthemacroscopicyieldcriterioncanbedeter-minedaccordingtotherelationbetweenmacroscopicandmicroscopicfields.Secondly,onthemacroscopicscale,byintroducingtheHill’syieldcriterionintothekinematiclimittheorem,thelimitloadsoforthotropicstructuressuchasunidirectionalfiber-reinforcedcompositestructuresareworkedout.Thefiniteelementmodelingofthekinematiclimitanalysisisdeducedintoanonlinearmathematicalprogrammingwithequality-constraintconditionsthatcanbesolvedbymeansofadirectiterativealgorithm.Finally,someexamplesareillustratedtoshowtheapplicationofthepresentapproach.

简介：Asiliconeacrylatemicro-emulsionofmultipolymerwaspreparedbyseedemulsionpolymerization.Theeffectsofpolymerizationprocess,emulsifierrateandamount,initiatorrateandamount,polymerizationtemperature,functionalmonomers,titrationtimeonperformancesofemulsionhavebeendiscussedindetail.

简介：以便调查设计方法因为一台微离心的压缩机，它是一台极端微煤气的汽轮机的最重要的部件，有2-dimensional片的离心的impeller的二种类型被设计，生产并且测试。这些impellers与对方一起在南方的飞机上有中心的不同形状。而且，impeller的这些类型为5被成为次和期末考试的6次尺寸与4mm的外部直径指向离心的impeller以便为impellers估计类似。在impellers的表演特征之中的比较在表演和压缩机的类似上揭示了南方的配置的影响。

简介：Fabricationofmicrogratingsusingafemtosecondlaserexposuresystemisexperimentallyinvestigatedfortheelectronmoirémethod.Microholesandlinesarefirstlyetchedforparameterstudy.Gratingprofileistheoreticallyoptimizedtoformhighqualitymoirépatterns.Forademonstration,aparallelgratingisfabricatedonaspecimenofquartzglass.Theminimumlinewidthandthedistancebetweentwoadjacentlinesarebothsettobe1μm,andthefrequencyofgratingis500lines/mm.Theexperimentalresultsindicatethatthequalityofgratingsisgoodandtherelativeerrorofthegratingspitchisabout1.5%.Basedonmoirémethod,scanningelectronmicroscope(SEM)moirépatternsareobservedclearly,whichmanifeststhatgratingsfabricatedwiththefemtosecondlaserexposureissuitableformicroscaledeformationmeasurement.

简介：1IntroductionEarlyattemptstocreateasoundabsorberwhichwouldfunctionwithouttheinvolvementofanyfibrousorporousdampingmaterialgofarbacktoK.A.Veliszhanina,S.N.RschevkinandothersaswasoutlinedinRef.[1].30yearsago,D.Y.MAA[2]wasfirstinproposingapracticabledesignconceptandcalculationmodelforMicro-PerforatedAbsorber(MPA)prototypeswhichstillformsthebasisforvariousapplications.Duringthepast12yearstheFraunhoferIBP

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简介：以便减少磨擦力量并且在低速度消除一个技工系统的粘住滑倒现象，一个方法基于超声的微开车技术被建议改变摩擦特征。顺时针方向激动并且在超声的致动器的二个纵的夹钳门栓的震荡器上驾驶点的逆时针方向的显微镜的椭圆的运动将产生超声的润滑油行动；而且，磨擦能被调整震荡器的颤动的振幅活跃地控制。为磨擦控制的试验性的安装用航空的指南，力量传感器和一低速度时刻被设计motor.Fuzzy控制理论被使用进这个系统。实验显示磨擦力量大部分被减少了，试验性的系统的运动是稳定的。当超声的致动器和负担is3.8kg和马达的全部的团正在开车时，磨擦系数仅仅是大约0.0053速度是0.5mm/s。

简介：为为快速的扫描激光横梁的pulsing激光横梁和Galvano扫描仪的Q开关被改编在水微滴操作微稳固的粒子。由激光横梁照耀由一个钇铝柘榴石激光系统，导致的流动，和粒子的导致的运动在微米大小的直径套住好粒子被讨论。粒子旋转被使用各向异性的微目标观察，并且而且旋转的率与顺时针方向方向是22r/min。一只盖子杯子的碎片在水微滴被混合，并且他们的尺寸和形状是不平的。没有由Galvano扫描仪扫描的那个非范围的旋转也在水里被观察。

简介：Transmissionofelasticwavesthroughamicrogapbetweentwosolidswithconsiderationoffrictionalcontactisinvestigated.ByusingtheFourieranalysistechniqueandthecorrectivesolutionmethod,thenonlinearboundaryproblemisreducedtoasetofalgebraicequations.Numericalresultsexhibitthelocationsandextentsofseparation,slip,andstickzones,theinterfacetractions,andtheenergypartition.Theeffectsofgapwidth,frictionalcoefficients,andtheincidentangleonthewavetransmissionarediscussedindetail.Theresultsshowthathigherharmonicsaregeneratedduetothelocalcontact/slipattheinterface.

简介：ThispaperresentsanewX-rayimagingmethodswingLaminography(SL)thatissuitalbletoperformnon-destructivetestingontheslender-shapedmulti-layersamples.ComputersimulationsaremadetocomparethelimitedprojectionsinSLandtheprincipleofchoosingOptimalProjectionAngularRegion(OPAR)isdiscussed.Theexperimentonatwo-layerPrintedCircuitsBoardshowsthatSLwith120°swinganglesdistributedinOPARcangettheseparatedimagesofeachlayer.

简介：Smallconcentrationsofahigh-molecular-weightpolymerhavebeenusedtocreateso-called'elasticturbulence'inamicro-scaleserpentinechannelgeometry.Itisknownthattheinteractionoflargeelasticstressescreatedbytheshearingmotionwithinthefluidflowwithstreamlinecurvatureoftheserpentinegeometryleadsinitiallytoapurely-elasticinstabilityandthenthegenerationofelasticturbulence.Weshowthatthiselasticturbulenceenhancestheheattransferatthemicro-scaleinthisgeometrybyupto300%undercreepingflowconditionsincomparisontothatachievedbytheequivalentNewtonianfluidflow.