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107 个结果
  • 简介:TheextendedcanonicalNoetheridentitiesandcanonicalfirstNoethertheoremderivedfromanextendedactioninphasespaceforasystemwithasingularLagrangianareformulated.UsingthesecanonicalNoetheridentities,itcanbeshownthattheconstraintmultipliersconnectedwiththefirst-classconstraintsmaynotbeindependent,soaquerytoaconjectureofDiracispresented.BasedonthesymmetrypropertiesoftheconstrainedHamiltoniansysteminphasespace,acounterexampletoaconjectureofDiracisgiventoshowthatDirac'sconjecturefailsinsuchasystem.WepresenthereadifferentwayratherthanCawley'sexamplesandother'sonesinthatthereisnolinearizationofconstraintsintheproblem.Thisexamplehasafeaturethatneithertheprimaryfirst-classconstraintsnorsecondaryfirst-classconstraintsaregeneratorsofthegaugetransformation.

  • 标签: 约束汉密尔顿函数 规范对称 迪拉克猜想 量子场论
  • 简介:我们在超流体3He-B经历Zitterbewegung,,自由相对论的迪拉克的电子。期望价值quasiparticle放,以及旋转被获得并且与迪拉克的电子的相比。特别地,Bogoliubov的quasiparticle的Zitterbewegung有约105比一个电子的降低的频率,显示更有希望的试验性的观察。

  • 标签: 系统 准粒子 超流体氦 实验观察 狄拉克 电子
  • 简介:平面连接的一种新、一般类型被介绍,它扩大由连接的二循环单人赛的运动学的链组成的Kempe开发的古典连接,由外卷的绞链相连。和一台锁住的设备,这些新连接有仅仅自由(DOF)的一度,它为用作使他们理想为不同目的部署有能力的结构。这里,我们为双环以分析的一个新鲜矩阵方法开始平面连接,用2D转变矩阵;一个新符号的符号。为Kempe的连接的一个盒子的另外的检查被提供。基于检查,借助于某小说代数学;几何技术,一个特别地迷人的答案被发现。物理模型被造证明在这篇论文的推导是有效的;新机制是正确的。

  • 标签: 变换基质 建筑物 建筑设计 建筑结构
  • 简介:当减肥遇见聚会.模特遭遇PARTY.美女与饕餮相逢……美丽的身材与美味之间将如何选择,心里盘算着永无止境的加减乘除.还是有第二条出路,如果丢掉肚脯上的赘肉.便意味着牺牲生命中的乐趣吗?你将永远拒绝朋友的聚会.或者在宴会上永远用眼睛享用美食?

  • 标签: 美女 聚会 模特 减肥
  • 简介:把自己比喻成一种动物,是什么?为什么?答:性感的蜘蛛,跟我现在怀孕的身材比较搭调。

  • 标签: 小S 性感 搞笑手段 生活方式
  • 简介:在这篇论文,基于高顺序的速度精力,集成和变化原则的定理,高顺序的哈密尔顿一般holonomic系统的原则被给。然后,三顺序的Lagrangian方程和四顺序的Lagrangian方程从高顺序的哈密尔顿的原则被获得。最后,哈密尔顿高顺序的Lagrangian功能的原则被给。

  • 标签: 高阶汉密尔顿原理 汉密尔顿原理 拉格朗日函数 速度能量
  • 简介:Inordertofacetheexpectedincreaseinstatisticsbetweennowand2005,theBabarexperimentatSLACisevolvingitscomputingmodeltowardadistributedmultitiersystem.ItisforeseenthatdatawillbespreadamongTier-AcentersanddeletedfromtheSLACcenter,Aunifromcomputingenvirommentisbeingdeployedinthecenters,thenetworkbandwidthiscontinuouslyincreasedanddatadistributiontoolshasbeendesignedinordertoreachatransferrateof-100TBofdataperyear,Inparallel,smallerTier-BandCsitesreceivesubsetsofdata,presentlyinKanga-Root[1]formatandlaterinObjectivity[2]format,GRIDtoolswillbeusedforremotejobsubmission.

  • 标签: BaBar实验 数据处理 分布计算模型
  • 简介:QuantumdynamicscalculationsforthetitlereactionH(2S)+S2(X3-Σg)→SH(X2Π)+S(3P)areperformedbyusingagloballyaccuratedoublemany-bodyexpansionpotentialenergysurface[J.Phys.Chem.A1155274(2011)].TheChebyshevrealwavepacketpropagationmethodisemployedtoobtainthedynamicalinformation,suchasreactionprobability,initialstate-specifiedintegralcrosssection,andthermalrateconstant.Itisfoundnotonlythatthereisareactionthresholdnear0.7eVinbothreactionprobabilitiesandintegralcrosssectioncurves,butalsothatboththeprobabilityandcrosssectionincreasefirstlyandthendecreaseasthecollisionenergyincreases.Theexistenceoftheresonancestructureinboththeprobabilityandcrosssectioncurvesisascribedtothedeeppotentialwell.Thecalculationoftherateconstantrevealsthatthereactionoccurringonthepotentialenergysurfaceoftheground-stateHS2isslowtotakeplace.

  • 标签: 反应概率 动力学计算 上海 量子 表面 截面曲线
  • 简介:它的接触角度(CA)上的考虑固体的可湿的性质能用古典Wenzel和Cassie的方程理论上被分析。然而,对超级恐水病的表面的最近的强烈兴趣要求了二个方程的适用性的复试。我们报导热力学的分析特别地,决定普遍性二个方程的限制。用一些特殊表面,我们证明二个方程为微规模的异构的结构是有效的,然而,他们为宏规模是有病的异构的表面。而且,现在的计算建议基本热力学的分析是最强大、可靠的途径为各种各样的在结构上决定全面wettability有图案的表面。

  • 标签: 热力学分析 方程 疏水表面 异质结构 微观尺度 表面结构
  • 简介:Alongwiththedevelopmentsonthehardware'stechniqueoftheLEDelectronicdisplay,thecontrolsoftwarewasalsoaskedtoadvancetoanewlevel.Theoldsoftwareofourcompanycouldn'tdemandnolonger.It'ssatisfythecustomer'snecessarytodesignanewplaysoftwaretoshowtheadvantagesoftheLEDelectronicdisplay.

  • 标签: LED API函数 DOC文档播放 软件设计 电子显示屏
  • 简介:Theaimofthisexpositionistoprovideadetaileddescriptionoftheuseofcombinatorialalgebrainquantumfieldtheoryintheplanarsetting.ParticularemphasisisplacedontherelationsbetweendifferenttypesofplanarGreen'sfunctions.TheprimaryobjectisaHopfalgebrathatisnaturallydefinedonvariablesrepresentingnon-commutingsources,andwhosecoproductsplitsintotwohalf-coproducts.Thelattergiverisetothenotionofanunshuffiebialgebra.ThissettingallowsadescriptionoftherelationbetweenfullandconnectedplanarGreen'sfunctionstobegivenbysolvingasimplelinearfixedpointequation.Wealsoincludeabriefoutlineoftheconsequencesofourapproachintheframeworkofordinaryquantumfieldtheory.

  • 标签: PLANAR field theory Green's functions free
  • 简介:Energyandenvironmentalissueshavebecomeincreasinglyprominentinmattersoftransportation.Comparedwithroad,air,andseatransportation,railwaytransportationhastheadvantagesofalargetransmissioncapacity,withrapid,safe,andon-timetravel,requiringlesslandresources,withlowerenergyconsumption,lessenvironmentalpollution,andthecapacitytooperateundermostweatherconditions.Inparticular,high-speedrailwaytechnologyhasbeengrowingrapidly.Sincetheworld'sfirsthigh-speedrailwaywasbuiltinJapanin1964,morethantencountriesandregionshavedevelopedhigh-speedrailways,operatingoveratotalofmorethan10000km.High-speedrailwaysnotonlyprovidethepublicwithanewtypeofrapid,convenient,safe,andcomfortabletravel,butalsogreatlyboostthesocio-economicdevelopmentofthecountry.

  • 标签: 铁路技术 中国 铁路运输 能源消耗 环境问题 海上运输
  • 简介:SmallRNA(sRNA)-mediatedpost-transcriptionalregulationdiffersfromprotein-mediatedregulation.Throughbasepairing,sRNAcanregulatethetargetmRNAinacatalyticorstoichiometricmanner.Sometheoreticalmodelswerebuiltforcomparisonoftheprotein-mediatedandsRNA-mediatedmodesinthesteady-statebehaviorsandnoiseproperties.ManyexperimentsdemonstratedthatasinglesRNAcanregulateseveralmRNAs,whichcausescrosstalkbetweenthetargets.Here,wefocusonsomemodelsinwhichtwotargetmRNAsaresilencedbythesamesRNAtodiscusstheircrosstalkfeatures.Additionally,thesequence-functionrelationshipofsRNAanditsroleinthekineticprocessofbase-pairinghavebeenhighlightedinmodelbuilding.

  • 标签: 调控理论 RNA介导 细菌 小RNA 碱基配对 转录后调控
  • 简介:Theliquidmolarvolumesofnonazeotropicrefrigerantmixtures(NARM),calculatedwithPengRobinson(PR)equation,werecomparedwithvapor-liquidequilibriumexperimentaldatainthispaper.Providedwithcoreactioncoefficientkij,thediscrepanciesofliquidmolarvolumedataforR22+R114andR22+R142busingPRequationare7.7%and8.1%,respectively.WhenHBT(Hankinson-Brobst-Thomson)equationwasjoinedwithPRequation,thedeviationsarereducedtolessthan1.5%forbothR22+R114andR22+R142b.

  • 标签: 汽液平衡 实验数据 计算数值
  • 简介:TheCDFcollaborationattheFermilabTevatronanalysesproton-antiprotoninteractionsatacenter-of=massenergyof2TeV.duringthethecolliderrunstartingthisyeartheexperimentexpectstorecord1Petabyteofdataandassociateddatasamples,TheDataHandling(DH)systemhasonlineandofflinecomponents.TheDHofflinecomponentprovidesaccesstothestoreddata,tostoredreconstructionoutput,tostoredMonte-Carlodatasamples,anduserowneddatasamples.Itservesmorethan450physicistsofthecollaboration.TheextrarequirementstotheofflinecomponentoftheDataHandlingsystemaresimplicityandconvenienceforusers.Morethan50millioneventsoftheCDFRunIIdatahavebeenalreadyprocessedusingthissystem.

  • 标签: CDF 数据处理系统 质子反质子相互作用
  • 简介:Theeffectofpressureoncombustionandheattransferisanalyzed.Theresearchisbasedonthebasiccombustionandheattransfertheorem.Acorrectionfortheheatcalculationmethodforpressurizedfurnaceismadeonthebasisofthenormalpressurecase.Thecorrectiontakestheeffectofpressurizingintoaccount.Theresultsshowthatthecorrectionisreasonableandthemethodisapplicabletocombustionandheattransferofthemarinesuperchargedboiler.

  • 标签: 船舶锅炉 受压燃烧 辐射热转换 热力计算