简介：Surfaceoriginatedkinkbandsconsistofanimportantfailuremodeforfibre-reinforcedcompo-sitesundercompression.Themechanicalbehaviorofthefibrebridgingkinkbandsisexploredhereininthecontextofthepost-microbucklingtheory.Expressionsofbridgingforceareobtainedfortheentirepostbucklingprocessofthefibresexhibitingweakorstronghardening.Thepostbucklingformulationofthefibresisappliedtoyieldthetoughnessincrementduetotheadvancingkinkbands,andconsequentlyleadstoaquantitativepre-dictionontheoverallcompressivestressstraincurvesofthefibre-reinforcedcomposites.

简介：TwogradesofDyneema~?compositelaminateswiththecommercialdesignationsofHB26andHB50werecutintoblockswithorwithoutanedgecrackandcompressedinthelongitudinalfiberdirection.Thecrackedanduncrackedspecimensshowsimilarcompressiveresponsesincludingfailurepatternandfailureload.ThetwogradesofDyneema~?compositesexhibitsdifferentfailuremodes:adiffuse,sinusoidalbucklingpatternforDyneema~?HB50duetoitsweakmatrixconstituentandakinkbandforDyneema~?HB26duetoitsrelativelystrongermatrixconstituent.AneffectivefiniteelementmodelisusedtosimulatethecollapseofDyneema~?composites,andthesensitivityoflaminatecompressiveresponsestotheoveralleffectiveshearmodulus,interlaminarshearstrength,thicknessandimperfectionangleareinvestigated.Thechangeoffailuremodefromkinkbandtosinusoidalbucklingpatternbydecreasingtheinterlaminarshearstrengthisvalidatedbythefiniteelementanalyses.

简介：把一个统计腐烂模型基于结合的一个动态Langevin方程，我们计算僵绳以后的巨大的偶极子回声(GDR)的变化有僵绳以后的磨擦力量的重原子核240Cf，246Cf，252Cf，和240U的光线复合()。我们发现僵绳以后的排放到的敏感与增加系统的neutron-to-proton比率(N/Z)更加减少。而且为240U，排放对不再敏感。我们建议那精确地由测量切断前GDR光线复合获得僵绳以后的磨擦强度的信息，与低N/Z在各种各样的复合系统之中选择那些是最佳的。

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简介：Inthepresentarticle,wedealwiththeso-calledoverconvergencephenomenoninCofaslightlymodifiedPost-Widderoperatorofrealvariable,thatiswiththeextensionofitsapproximationpropertiesfromtherealaxisinthecomplexplane.Inthissense,errorestimatesinapproximationandaquantitativeVoronovskaya-typeasymptoticformulaareestablished.

简介：模式跳是在buckling以后区域的不稳定性现象，它在平衡配置引起一个突然的变化并且因此是有害的组织。一个部分有弹性的基础的配置能直接导致模式从弄弯的阶段并且通过整个buckling以后区域联合。在模式跳上由于部分基础的配置联合效果的模式被调查并且示威了是决定模式跳的一个重要因素。由适当地选部分有弹性的基础为配置，模式跳能被避免。

简介：Thispaperattemptstoinvestigatethebucklingandpost-bucklingbehaviorsofpiezoelectricnanoplatebasedonthenonlocalMindlinplatemodelandvonKarmangeometricnonlinearity.Anexternalelectricvoltageandauniformtemperatureriseareappliedonthepiezoelectricnanoplate.Boththeuniaxialandbiaxialmechanicalcompressionforceswillbeconsideredinthebucklingandpost-bucklinganalysis.Bysubstitutingtheenergyfunctionsintotheequationoftheminimumtotalpotentialenergyprinciple,thegoverningequationsarederiveddirectly,andthendiscretizedthroughthedifferentialquadrature(DQ)method.Thebucklingandpost-bucklingresponsesofpiezoelectricnanoplatesarecalculatedbyemployingadirectiterativemethodunderdifferentboundaryconditions.Thenumericalresultsarepresentedtoshowtheinfluencesofdifferentfactorsincludingthenonlocalparameter,electricvoltage,andtemperatureriseonthebucklingandpost-bucklingresponses.

简介：Thepost-curekineticsofelectronbeam(EB)curingofepoxyresininitiatedbydiaryiodiniumwasinvestigated.Thepost-curereactionfitsfirstorderreactionkinetics.Thereactionrateconstantincreaseswithincreasingtreatmenttemperatureofpost-cure.Thereactionrateofpost-cureismuchlowerthantherateofitsreactiononelectronbeamtreatment.

简介：InthispaperweestablishtheoscillationinequalityofharmonicfunctionsandHlderestimateofthefunctionsinthedomainoftheLaplacianonconnectedpostcriticallyfinite(p.c.f.)self-similarsets.

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简介：Equilibriumpathsofpost-bucklingaremeasuredforlargeslendernesscolumnspecimensmadeofthefiberreinforcedcompositematerial.Theinfluenceoftheinitialcurvatureisinvestigatedexperimentallyandcomparedwiththeresultoftheinitialpost-bucklingtheory.Boththetheoreticalandexperimentalresultsrevealthatthecolumnwiththeinitialcurvaturehasstablepost-bucklingbe-haviorsandisnotsensitivetotheimperfectionintheformofinitialcurvature.Theexperimentalre-sultsshowthatwhenthelateralbucklingdisplacementislessthan20percentofthecolumnlength,theexperimentalresultsagreewiththeresultsfromthetheoryofinitialpost-bucklingquitewell,whiletheyagreewiththeresultsfromthelargedeflectiontheoryinaquitelargerange.

简介：Onthebasisofboththegeneraltheory[1,2]andthefiniteelementmethod[4]ofperforatedthinplateswithlargedeflection,thebucklingandpost-bucklingofannularplatesundernon-axisymmetricplaneedgeforcesarestudied.

简介：Wedemonstrateanovelhigh-accuracypost-fabricationtrimmingtechniquetofine-tunethephaseofintegratedMach–Zehnderinterferometers,enablingpermanentcorrectionoftypicalfabrication-basedphaseerrors.Theeffectiveindexchangeoftheopticalmodeis0.19inourmeasurement,whichisapproximatelyanorderofmagnitudeimprovementcomparedtopreviousworkwithsimilarexcessopticalloss.Ourmeasurementresultssuggestthataphaseaccuracyof0.078radwasachievablewithactivefeedbackcontrol.

简介：AmethodoflocalizationisproposedtolowerthehighorderofequationsinFEMcalcula-tionforthestabilityofacomplexthin-walledstructure.Thelocalizedanalysisenablesustoobtainboththeupperandlowerlimitsforthebifurcatingpointinawholelinearelasticstructuralsystem,aswellasanap-proximatesolutiontoasymptoticpost-bucklingproblem.Somenumericalexamplesareincluded.

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简介：Siliconcarbidefiber/siliconcarbidematrix(SiCf/SiC)compositesareofinterestasafuelcladdingandstructuralmaterialindesignsofadvancednuclearreactorduetotheirsuperiorthermo-mechanicalpropertiesandstabilitiesandlowcross-sectionforneutroncaptureunderthesevereserviceenvironmentincludinghightemperatureandhighenergyneutronbombardment.SiCf/SiCcompositionsconsistsofSiCfiberandSiCmatrixwhichexistinwellover100polymorphsdependentonthevariedstackingofSi-Cclose-packedatomicplanes,2H-SiC,4H-SiC,6H-SiC,3C-SiC,15R-SiC,etc.EnergeticHeatomscanbecreatedandaccumulatedvianuclearreactions.HeatomsagglomerateandcoarsenintoHebubblesandcandeterioratestructuralpropertiesbyinducingcrackandcreep.Inthisexperiment,thedamageofn-type4H-SiCwafers(researchstandard,suppliedbytheCreeResearchInc.)withathicknessof0.38mmimplantedwith100keVHe+toafluenceof31016He+/cm2andpost-implantation-annealedbehavioratdifferenttemperaturewerestudiedusingRamanscatteringspectroscopy.

简介：High-performancethin-filmtransistors(TFTs)withalowthermalbudgetarehighlydesiredforflexibleelectronicapplications.Inthiswork,theTFTswithatomiclayerdepositedZnO-channel/Al_2O_3-dielectricarefabricatedunderthemaximumprocesstemperatureof200℃.First,weinvestigatetheeffectofpost-annealingenvironmentsuchasN_2,H_2-N_2(4%)andO_2onthedeviceperformance,revealingthatO_2annealingcangreatlyenhancethedeviceperformance.Further,wecomparetheinfluencesofannealingtemperatureandtimeonthedeviceperformance.Itisfoundthatlongannealingat200℃isequivalenttoandevenoutperformsshortannealingat300℃.ExcellentelectricalcharacteristicsoftheTFTsaredemonstratedafterO_2annealingat200℃for35min,includingalowoff-currentof2.3×10~(-13)A,asmallsub-thresholdswingof245mV/dec,alargeon/offcurrentratioof7.6×10~8,andahighelectroneffectivemobilityof22.1cm~2/V·s.Undernegativegatebiasstressat—10V,theabovedevicesshowbetterelectricalstabilitiesthanthosepost-annealedat300℃.Thusthefabricatedhigh-performanceZnOTFTwithalowthermalbudgetisverypromisingforflexibleelectronicapplications.