简介：随着新课程标准的颁布实施,教育教学的改革不断深入,各种符合具体教学实践需要的教学模式也不断出现,体验教学模式就是其中之一。本文采用教学案例分析的方法,以《机械能守恒定律》为例,阐述了体验式教学法的理论依据与内涵,介绍了该教学法在物理课堂教学中的运用,提出了课堂要提倡＂三实＂的理念,并分析了体验式教学法在促进学生有效学习,促进学生思维培养,提升学习的幸福感等方面的作用。

简介：体验式教学是一种“以生为本”，让学生在亲历的过程中体验学习，主动参与知识建构的教学方式。本文主要针对高中物理传统课堂教学存在的弊端，提出体验式课堂教学策略四部曲，并应用于课堂实践教学，对突出学生的课堂主体地位，提升学生学习物理的兴趣有积极的促进作用，高中的物理课堂因“体验”而充满生命化、个性化的气息。

简介：动态设计是结构设计领域的重要内容和前沿课题，借此可以有效改善设备的动力学性能，但是传统的动态设计是一种被动式设计方法，设计人员与计算机之间缺乏信息交互能力，不能充分利用设计人员的智能。

简介：通过研究三自由度模拟支撑致稳平台的支撑方式、控制算法、平台机构的运动学仿真、分析并建立在关节空间和作动器的运动方向的速度变换关系式、建立平台的运动精度模型，为研究六自由度姿态控制技术做准备并制定控制指标。

简介：Theabilitytomove10sofTeraBytesinreasonableamountsoftimearecriticaltomanyoftheHighEnergyPhysicsapplications.Thispaperexaminestheissuesofhighperformance,highreliabilitytapestoragesystems,andpresentstheresultsofa2-yearASCIPathForwardprogramtobeabletoreliablymove1GB/stoanarchivethatcanlast20years.Thispaperwillcovertherequirements.approach,hardware,applicationsoftware,interfacedescriptions,performance,measuredreliabilityandpredictedreliability.Thispaperwillalsotouchonfuturedirectionsforthisresearch.Thecurrentresearchallowssystemstosustain80MB/sofuncompressabledataperFibreChannelinterfacewhichisstripedoutto8ormoredrives.Thislookstotheapplicationasasingletapedrivefrombothmoutanddatatransferperspectives.Striping12RAITsystemstogetherwillprovidenearly1GB/stotape.Thereliabilityisprovidedbyamethodofaddingparitytapestothedatastripes.Forexample,adding2paritytapestoan8-stripegroupwillallowany2ofthe10tapestobelostordamagedwithoutlossofinformation.ThereliabilityofRAITwith8stripesand2paritiesexceedsthatofmirroredtapeswhileRAITuses10tapesinsteadofthe16tapesthatamirrorwouldrequire.TheresultsofthispaperistobeabloetounderstandtheapplicabilityofRAITandtobeabletounderstandwhenitmaybeusefulinHighEnergyPhysicsapplications.

简介：ThispaperintroducesthedefinitionoftheOrthogonalTypeNodeConfigurationanddiscussesthecorrespondingmultivariateLagrange,HermiteandBirkhoffinterpolationproblemsinhighdimensionalspaceRs(s＞2).ThisnodeconfigurationcanbeconsideredtobeakindofextensionoftheCrossTypeNodeConfiguration[1],[2]inR2tohighdimensionalspaces.AndtheMixedTypeNodeConfigurationinRs(s＞2)isalsodiscussedinthispaperinanexample.

简介：Thereisawidespreadinterestinleadtelluride(PbTe)asagoodthermoelectricmaterial.WereportthetemperaturedependenceofthermopowerS(T)andresistanceR(T)forPbTeatthedifferentpressuresoffrom1.8GPato5GPaobtainedbyusingthecubicanvilhighpressureapparatus.Withincreasingpressure,R(T)andS(T)decrease.TheeffectofpressureonR(T)islargerthanthatonS(T).Thepowerfactorthatisdeterminedbythermopowerandresistivityincreaseswithincreasingpressure.Thismethodisanefficienttoolforsynthesizinggoodthermoelectricmaterialsathighpressureandhightemperature.

简介：针对IVI测试系统中仪器互换性差、开发灵活性差而带来测试费用昂贵、开发周期长的问题,提出了符合IVI规范的、采用统一编程标准的可行办法,并对实现仪器互换性的关键技术IVI仪器驱动器、IVI仪器驱动功能库、IVI类驱动器、IVI状态管理机构及其相关技术进行了研究。用IVI技术实现测试系统仪器的互换性,无论从军事还是商业角度来看,既能给用户带来显著的效益,又提高了开发商的产品在市场的竞争力。

简介：Propagationpropertiesofhigh-powerfiberlaserwithhigh-order-mode(HOM)contentarestudiednumericallyforthefirsttimetothebestofourknowledge.TheeffectofHOMonthepropagationpropertyisevaluatedbythepowerinthebucket(PIB)metric.ItisshownthatPIBismainlydependentonHOMcontentratherthantherelativephasebetweenthefundamentalmodeandHOM.ThePIBinvacuumismorethan80%whenthepowerfractionoftheHOMiscontrolledtobelessthan50%at5km.Therelativephasehasanimpactonthepeakintensitypositionandconcentrationofthefar-fieldintensitydistribution.Ifanadaptiveopticssystemisusedtocorrectthepeakintensitydeviation,theresultsindicatethatthereexistsamaximalvalueofPIBasrelativephaseincreases.Sucheffectisweakenedwhenpropagatinginturbulence.ComparedtothelaserbeamswithoutHOM,laserbeamswithHOMcontentarelessinfluencedbytheturbulenceandcanreduceaverageintensityfluctuation.Theresultsmaybeusefulinthedesignofahigh-powerfiberlasersystem.

简介：Activatedcarbon(AC)wasfabricatedfromcorncob,whichischeapandabundant.Experimentalparameterssuchasparticlesizeofcorncob,KOH/charweightratio,andactivationtemperatureandtimewereoptimizedtogenerateAC,whichshowshighmethanesorptioncapacity.AChashighspecificsurfacearea(3227m2/g),withporevolumeandporesizedistributionequalto1.829cm3/gandca.1.7-2.2nm,respectively.Undertheconditionof2℃andlessthan7.8MPa,methanesorptioninthepresenceofwater(Rw=1.4)wasashighas43.7wt%methaneperunitmassofdryAC.Theresultissignificantlyhigherthanthoseofcoconut-derivedAC(32wt%)andorderedmesoporouscarbon(41.2wt%,Rw=4.07)underthesamecondition.ThephysicalpropertiesandamorphouschaoticstructureofACwerecharacterizedbyN2adsorptionisotherms,XRD,SEMandHRTEM.Hence,thecorncob-derivedACcanbeconsideredasacompetitivemethane-storagematerialforvehicles,whicharerunbynaturalgas.

简介：orthotropic与为平凡高度的温度参数的组成的关系--力量在biaxial压缩下面的高效的水泥(HSHPC)被开发。它基于为包括伪=蟽2在7不同压力比率在HSHPC的二个力量层次描绘力量和变丑行为执行的实验：蟽3=0.00：?1，?0.20：?1，?0.30：?1，?0.40：?1，?0.50：?1，?0.75：?1，?1.00：?1在到20，200，300，400，500和600掳C的正常、高的温度的暴露以后，并且用一台大静电干扰动态的真triaxial机器。biaxial测试在100公里脳上被执行100公里脳100公里立方的标本，和减少磨擦的垫被使用为压缩装载飞机与甘油中立者由塑料膜的三层组成。基于试验性的结果，HSHPC标本的失败模式被描述。主要静态的压缩力量，在山峰应力的紧张和压力紧张曲线被测量；并且他们上的温度和压力比率的inuence也被分析。试验性的结果证明在到高温度的暴露以后的平凡HSHPC的单轴的压缩力量不随温度的增加戏剧性地减少。到它的单轴的压缩力量的biaxial的比率在暴露以后取决于压力比率和HSHPC的易碎物僵硬到不同温度层次。从理论模型和试验性的数据获得的压力紧张结果的比较显示好同意。

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简介：高密度聚乙烯(HDPE)的薄墙样品经由注射塑造，不同注射速度从100mm/s到1200mm/s被准备。在张力的力量和幼仔模量的重要减少与增加注射速度被观察。为了在这后面调查机制，减少，取向，分子的重量，分子的重量分发，融化流动率，crystallinity和水晶HDPE的形态学用二维的宽角度的X光检查衍射(2D-WAXD)被描绘，胶化浸透层析(GPC)，毛状的电流测定和微分扫描热量测定(DSC)分别地。这被表明取向，分子的重量，分子的重量分发，融化流动率和crystallinity没与增加有明显的变化注射速度。不过，扩大的链晶体的内容或大合拢的链晶体被发现与增加注射速度减少。因此，在张力的性质的减少被扩大的链晶体或大合拢的链晶体的减少的内容主要贡献，这被结束。这研究为高速度注射塑造的申请向工业提供珍贵信息。

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简介：Acompositionmethodforconstructinghighordermultisymplecticintegratorsispresentedinthispaper.Thebasicideaistoapplycompositionmethodtoboththetimeandthespacedirections.Wealsoobtainageneralformulaforcompositionmethod.

简介：Wehaveprototypedandanalyzeddesignofanovelapproachforthehighthroughputcomputing-acoreelementfortheemergingHENPcomputationalgrid.IndependenteventprocessinginHENPiswellsutedforcomputinginparallel.Theprototypefacilitatedsuseofinexpensivemass-marketcomponentsbypovidingfaulttolerantresilienece(insteadoftheexpensivetotalsystemreliablity)viahighlyscalablemanagementcomponents.TheabilitytohandlebothhardwareandsoftwarefailuresonalargededicatedHENPfacilitylimitstheneedforuserintervention.ArobustdatamanagementisespeciallyimportantinHENPcomputingsincelargedata-flowsoccurbeforeand/oratfereachprocessingtask.Thearchitectureofouractiveobjectobjectcoordinationschemaimplementsamulti-levelhierarchicalagentmodel,Itprovidesfaulttolerancebysplittingalargeoveralltaskintoindependentatomicprocesses,performedbylowerlevelagentssynchronizingeachotherviaalocaldatabase.Necessarycontrolfunctionperformedbyhigherlevelagentsinteractwiththesamedatabasethusmanagingdistributeddataproduction.ThesystemhasbeentestedinproductionenvironmentforsimulationsintheSTARexperimentatRHIC.Ourarchitecturalprototypecontrolledprocessesonmorethanahundredprocessorsatatimeandhasrunforextendedperiodsoftime.Twentyterabytesofsimulateddatahavabeenproduced.ThegenericnatureofourtwolevelarchitecturalsolutionfaulttoleranceindistributedenvironmenthasbeendemonstratedbyistsuccessfultestforthegridfilereplicationservicesbetweenBNLandLBNL.

简介：Thevehicleswithhighgravitycentrearemorepronetorollover.Thepaperdealswithamethodofdynamicsanalysisoffireengineswhichisanexampleofthesetypesofvehicle.AlgorithmsforgeneratingtheequationsofmotionhavebeenformulatedbyhomogenoustransformationsandLagrange’sequation.Themodelpresentedinthisarticleconsistsofasystemofrigidbodiesconnectedonewithanotherforminganopenkinematicchain.Roadmaneuverssuchasalanechangeandnegotiatingacirculartrackhavebeenpresentedasthemainsimulationswhenacarlosesitsstability.Themethodhasbeenverifiedbycomparingnumericalresultswithresultsobtainedbyexperimentalmeasurementsperformedduringroadtests.

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简介：BasedonChen-Haus′theory,anexperimentalresearchonthereflectionofSAWfromashort-circuitedAu-gratingonYZLiNbO3andashort-circuitedAl-recessedgroovegratingonST-Xquartzisfirstpresentedinthispaperwhereananomalousreflectionphenomenaexistingintwogratingsareconfirmed.Inaddition,aresidualreflectionwhichcouldn′tbecompletelycancelledbymeansofchangingstrip-thicknessispointedoutforashort-circuitedAu-gratingonYZLiNbO3bothexperimentallyandtheoreticallythroughextendingChen-Haus′theorytoanisotropiccrystals.Finally.twokindsofIDTcomposedofsingleelectrodes:Au-electrodeonYZLiNbO3andAl-recessed-groove-electrodeonST-Xquartz,areproposedforhighinternalreflectionsuppression.TheexperimentalresultsofbandpassfiltersconstructedwiththeIDTsmentionedaboveshowagreatim-provementinpassbanddistortionandapotentialusefulnessofnewstructureinhighfrequencyrange.