学科分类
/ 25
500 个结果
  • 简介:BasedontheLordandShulmangeneralizedthermoelasticitytheorywithonerelaxationtime,anisotropicsemi-infiniteplatesubjectedtoamovingheatsourcehasbeenstudiedbyemployingthefiniteelementmethoddirectlyintimedomain,whosedistributionsofnondimensionaltemperature,displacementandstressareillustratedgraphically.Theresultsshowthatthepresentmethodisaneffectiveandexactnumericaloneforsolvingthethermoelasticcouplingproblemandiscapableofovercomingthedefectsoftraditionalintegratedtransformationandinverseintegratedtransformationmethods.Atthesametime,thetemperaturestepofthethermalwavefrontisobtainedexactlyincontrastwithconventionalnumericaltransformationmethods.

  • 标签: 热弹性理论 移动热源 耦合问题 动态响应 二维 三维温度
  • 简介:寻求新无限的顺序象soliton一样非线性的进化方程的准确答案(旧姓)由在辅助方程方法上开发建设和机械化的二个特征,秒种椭圆形的方程高度被学习并且新类型答案和B?cklund转变被获得。(2+1)然后,维的碎soliton方程作为一个例子和它的无限的顺序被选象soliton一样准确解决方案在符号的计算系统Mathematica的帮助下被构造,它包括无限的顺序Jacobi椭圆形的类型的光滑的象soliton一样解决方案,Jacobi椭圆形的类型的无限的顺序协议soliton解决方案和指数的函数类型和三角形的功能的无限的顺序山峰soliton解决方案打字。

  • 标签: 破裂孤子方程 无限序列 精确解 Mathematica BACKLUND变换 Jacobi
  • 简介:Thispaperpresentstwokinematicfailuremechanismsofthree-dimensionalrectangularfootingrestingonhomogeneousundrainedclayfoundationunderuniaxialverticalloadinganduniaxialmomentloading.ThefailuremechanismunderverticalloadingcomprisesaplanestrainPrandtl-typemechanismoverthecentralpartofthelongerside,andthesizeofthemechanismgraduallyreducesattheendsofthelongersideandovertheshortersideasthecornerofrectangularfootingisbeingapproachedwherethedirectionofsoilmotionremainsnormaltoeachcorrespondingsiderespectively.Thefailuremechanismundermomentloadingcomprisesaplanestrainscoopslidingmechanismoverthecentralpartofthelongerside,andtheradiusofscoopslidingmechanismincreaseslinearlyattheendsofthelongerside.Onthebasisofthekinematicfailuremechanismsmentionedabove,theverticalultimatebearingcapacityandtheultimatebearingcapacityagainstmomentormomentultimatebearingcapacityareobtainedbyuseofupperboundlimitanalysistheory.Atthesametime,numericalanalysisresults,Skempton'sresultsandSalgadoetal.'sresultsarecomparedwiththisupperboundsolution.Itshowsthatthepresentedfailuremechanismsandplasticlimitanalysispredictionsarevalidated.Inordertoinvestigatethebehaviorsofundrainedclayfoundationbeneaththerectangularfootingsubjectedtothecombinedloadings,numericalanalysisisadoptedbyvirtueofthegeneral-purposeFEMsoftwareABAQUS,wheretheclayisassumedtoobeytheMohr-Coulombyieldingcriterion.ThefailureenvelopeandtheultimatebearingcapacityareachievedbythenumericalanalysisresultswiththevaryingaspectratiosfromlengthLtobreadthBoftherectangularfooting.ThefailuremechanismsofrectangularfootingwhicharesubjectedtothecombinedverticalloadingVandhorizontalloadingH(VerticalloadingVandmomentloadingM,andhorizontalloadingHandmomentloadingMrespectivelyareobservedinthefiniteelementa

  • 标签: 运动失效机制 矩形桩靴 失效包装 跳跃极限分析
  • 简介:-Theturbulencemechanismplaysanimportantpartinthemixingprocessandmomentumtransferofturbulence.Athree-dimensionalPrandtlmixinglengthtidalmodelhasbeendevelopedtosimulatetidalflowsandwaterquality.TheeddyviscositiesanddiffusivitiesarecomputedfromthePrandtlmixinglengthmodel.Inordertomodelthewaterqualityofanestuaryorcoastalareamanyinterdependentprocessesneedtobesimulated.Thesemaybeconvenientlyseparatedintothreemaingroups:transportandmixingprocesses,biochemicalinteractionofwaterqualityvariablesandtheutilizationandre-cyclingofnutrientsbylivingmatter.Themodelsimulatesfulloxygenandnutrientbalance,primaryproductivityandthetransport,reactionmechanismandfateofpollutantsovertidaltime-scales.ThemodelisappliedtonumericalsimulationoftidalflowsandwaterqualityinDalianBay.Themodelhasbeencalibratedagainstalimiteddatasetofhistoricalwaterqualityobservationsandingeneraldemonstra

  • 标签: THREE-DIMENSION TIDAL FLOWS water quality ECOSYSTEM
  • 简介:一新大规模三维(3D)重建技术基于有颜色位置特征的不可分的成像被介绍。目标点的颜色类似于相应的点的那些。因为不可分的成像与在x和y方向上有类似的程度的一个高级数组捕获信息,相应的点坐标形成算术前进。这种常规关系被用来决定相应的点参数因为从划分元素的图象的重建的3D信息由颜色分开了,它包含几个相应的点。建议方法的可行性通过一个光室内的实验被表明。建议方法的大规模应用被实验作为它的目标与我们的学校的一个角落说明。

  • 标签: 颜色特征 三维重建 成像 场景 位置 室内实验
  • 简介:Bydirectnumericalsimulation,asupersonicboundarylayerwasstudiedtoseewhetherthemechanismforthegenerationofsub-harmonicwaves,similartothosefortheincompressibleflows,existedintheprocessoflaminar-turbulenttransition.Theresultsshowedthatmechanismsofbothresonanttriadandsecondaryinstabilitydidexist.Discussionsweremadeonwhetherthesetwomechanismsarereallyimportantinlaminarturbulenttransition.

  • 标签: 次级不稳定性 二维超声边界层 T-S波 次谐振波
  • 简介:一新(2+1)维的格子方程被介绍在联合Toda格子和相对论的Toda格子(TL-RTL)的层次在开始的二个成员之上基于方程在(1+1)尺寸。为联合TL-RTLequations的层次的Darboux转变被构造。在联合TL-RTLequations的层次的开始的二个成员的答案,以及新(2+1)维的格子方程被theDarboux明确地获得转变。

  • 标签: 组合TL-RTL方程 可积系统 Darboux转化 Toda晶格方程
  • 简介:Cross-culturalmanagementisoftenregardedasadisciplineofinternationalmanagementfocusingonculturalencountersbetweentheorganizationandthenation-state,andprovidingtoolstotackleculturaldifl'erencesseenassourcesofconflict,frictionormisunderstanding.BasedonGreetHofstede'sCulturalModel,thispaperattemptstoshedsomelightoneffectivecorporationmanagementthroughculturalanalysisofthedifl'erencesbetweenChinaandwesterncountries.Thepaperputsmoreemphasisontheimpactofculturalcompatibilityoneffectivecorporationman-agementthroughthecasestudyofChina,Japan,GermanyandAmerica.Theauthorarguesthatmanagersandemploy-eesinvolvedincompanieswithdiverseculturalbackgroundsshouldbeintegratedanddevelopedintoaspecificlocalcontextthroughinterlockingtheirculturalidentificationsandtheorganizationalpractices.

  • 标签: CULTURAL DIFFERENCES CULTURAL Four-Dimensional Model CULTURAL
  • 简介:由密度功能的计算,我们调查在一个维的泛音陷井限制的Bose费密混合的地面状态性质。有接触相互作用的波色子和极化的费米子的同类的混合能被Bethe-ansatz方法确切解决。在给地面状态精力密度的准确公式以后,我们采用本地密度的近似决定每个部件的密度分发。相互作用什么时候足够强壮却有限,被显示出随相互作用的增加,全部的密度分发演变到在二个部件之间的像费密的分发和系统展览阶段分离。当在无限的相互作用限制波色子和费米子显示完全一样的像费密的分布并且分阶段执行时,分离消失。

  • 标签: 密度分布 费米子 玻色子 混合物 基态 陷阱
  • 简介:Inthispaper,theoceanacousticchannelisconsideredasatime-variantchannel.Inordertoanalysetheconjointtime-shift-fre-quency-delaydistributionorthefadingandspreadstatisticalcharacteristicsofthechannel.TheTDWVS(TwoDimensionalWigner-VilleSpectrum)ofthetime-variantchannelisdefined.TherelationbetweentheWVS(Wigner-VilleSpectrum)oftheinputandtheoutputofthechannelisdiscussedandsomeexamplesforthespecificchannelareshown.Finally,theapplicationsonthedetectionofsignalsinnoiseusingtheWVSandTDWVSaregivenandtheadvantageisobvious,whenthedetectedsignalislinearfrequency-modulationsignal.

  • 标签: ocean WIGNER FADING SPECTRUM MULTIPATH TRIGGERING
  • 简介:ThispaperisdevotedtoacombinedFourierspectral-finitedifferencemethodforsolving3-dimensional,semi-periodiccompressiblefluidflowproblem.Theerrorestimation,aswellastheconvergencerate,ispresented.

  • 标签: Spectral-difference method COMPRESSIBLE fluid FLAW ERROR
  • 简介:Weintroduceanewmodelofone-dimensional(1D)photoniccrystalcomposedofalternatelyarrangedRHMandLHMlayerswithpositiveandnegativerefractiveindicesrespectively,forwhichthetransmissionspectraofthemodelarecalculatednumericallywiththetransfermatrixmethod,andtheband-gapstructureandthepolarizationpropertiesareanalyzed.Wefoundthattheintroductionofnegativerefractiveindexlayers(i.e.LHMmediumlayers)givesrisetosomepeculiarband-gapstructureandpolarizationpropertiesasfollows.Firstly,theforbiddenbandsareextremelywideandthetransmissionbandsareverysharpwithoutoscillation;andsecondly,thechangeofincidentanglehasdifferentinfluencesontheforbiddenbandsofTEandTMmodes.FortheTMmode,theforbiddenbandwidthdecreasessubstantiallyandfinallyvanishes,andfortheTEmodewithcentralwavelength,thetotalreflectionhappensatanyincidentangle.

  • 标签: 光子晶体 光谱传输 折射系数 能隙带 偏振性质
  • 简介:在现在的纸,包含三个任意的函数为的一个一般解决方案概括(2+1)维的KdV-mKdV方程,它被导出从概括(1+1)维的KdV-mKdV方程,首先借助于Wiess被介绍,小鼓,Carnevale(WTC)截断方法。然后有考虑的几条能量守恒定律的multisymplectic明确的表达被介绍为概括(2+1)维的KdV-mKdV方程基于桥的multisymplectic理论。随后,源于以便以Jacobi椭圆形的功能的合理功能模仿周期的波浪答案一般答案,一个半含蓄的multi-symplectic计划被构造那等价于Preissmann计划。从数字实验的结果,我们能断定multi-symplectic计划能精确地模仿周期的波浪答案概括(2+1)维的KdV-mKdV方程当时近似保存能量守恒定律。

  • 标签: KDV-MKDV方程 KDV-MKDV方程 广义 PREISSMANN格式 JACOBI椭圆函数 辛方法
  • 简介:WenumericallyperformedwavedynamicalsimulationsbasedontheMaxwell–Bloch(MB)modelforaquadrupole-deformedmicrocavitylaserwithspatiallyselectivepumping.Wedemonstratetheappearanceofanasymmetriclasingmodewhosespatialpatternviolatesboththex-andy-axesmirrorsymmetriesofthecavity.Dynamicalsimulationsrevealedthatalasingmodeconsistingofaclockwiseorcounterclockwiserotating-wavecomponentisastablestationarysolutionoftheMBmodel.Fromtheresultsofapassive-cavitymodeanalysis,weinterprettheseasymmetricrotating-wavelasingmodesbythelockingoffournearlydegeneratepassive-cavitymodes.Forcomparison,wecarriedoutsimulationsforauniformpumpingcaseandfoundadifferentlockingruleforthenearlydegeneratemodes.Ourresultsdemonstrateanonlineardynamicalmechanismfortheformationofalasingmodethatadjustsitspatterntoapumpedarea.

  • 标签:
  • 简介:Takingaccountofturbulenceintensity,non-uniformityofvelocitydistributionattheinitialandsequentsec-tionofhydraulicjumpandfrictionaldragonthefloorwithinjumprange,thispaperderivesnewformulasforcal-culatingtheratioofconjugatedepthsandtheefficiencyofenergydissipationinthetwo-dimensionalfreehydraulicjump.Ithasbeenverifiedbytestdatathatthenewformulasarenotonlyexactintheorybutalsostillbetterinconformitywithpractice.

  • 标签: TURBULENCE DISSIPATION sequent CONJUGATE hydraulic frictional