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500 个结果
  • 简介:AnewGraphicsProcessingUnit(GPU)parallelizationstrategyisproposedtoacceleratesparsefiniteelementcomputationforthreedimensionalelectromagneticanalysis.TheparallelizationstrategyisemployedbasedonanewcompressionformatcalledslicedELLFour(slicedELL-F).TheslicedELL-Fformat-basedparallelizationstrategyisdesignedforhasteningmanyaddition,dotproduct,andSparseMatrixVectorProduct(SMVP)operationsintheConjugateGradientNorm(CGN)calculationoffiniteelementequations.ThenewimplementationofSMVPonGPUsisevaluated.TheproposedstrategyexecutedonaGPUcanefficientlysolvesparsefiniteelementequations,espe-ciallywhentheequationsarehugesparse(sizeofmostrowsinacoefficientmatrixislessthan8).NumericalresultsshowtheslicedELL-Fformat-basedparallelizationstrategycanreachsigni?cantspeedupscomparedtoCompressedSparseRow(CSR)format.

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  • 简介:为三聚会的量秘密分享一把私人钥匙的一个计划与单个光子被介绍。代理人鲍勃首先与二个偏导的基地准备单个光子的一个序列然后送他们给与大小检查传播的安全并且由重排生产一些圈套光子的老板艾莉斯一些样品光子的订单。Aliceencodes她有光子上的二单一的操作的位然后把他们送到另外的代理人。这个计划的安全在修改Bennet臂章等价于那1984量钥匙分发协议。而且,每个光子能带一位私人钥匙和内在的效率因为当在钥匙中的位的数字是时,qubits和全部的效率两个都百分之百接近最大的价值大。

  • 标签: 光量子 量子密码 信息光学 光谱
  • 简介:在这份报纸,我们调查光谱为在三种尺寸的混合不同类的边界价值问题的方法。在Jacobi加权的Sobolev空格的三维的Legendre近似上的一些结果被建立,它改进并且概括存在结果,并且在部分微分方程的数字解决方案起一个重要作用。我们也开发一种上升技术,我们能容易与处理混合不同类的边界条件。作为应用程序的例子,光谱计划与混合不同类的边界条件被为三个模型问题提供。光谱在建议算法的空间的精确性被证明。有效实现被介绍。数字结果表明他们的高精确性,并且证实理论分析很好。

  • 标签: 混合边值问题 三维空间 加权SOBOLEV空间 非齐次边界条件 谱方法 非均匀
  • 简介:ThecoreissueforChinatransitiondevelopmentinthenext30yearsistoshiftfromthequantitygrowthmodeltothequalityimprovementmodel.Thepaperintroducestheresearchprogressinthreekeyareasofsustainabledevelopmentstudiessincethe1990s.Itispointedoutthatthereisawell-beingthresh-oldatwhichthemarginutilityofeconomicgrowthforhumanwell-beingwilldecline,thatthereisanecologicallimitbeyondwhichmoreeconomicgrowthintermsofphysicalscalewillbeimpossible,andthatthecreationofhumanwell-beingisrelatednotonlytotheamountbutalsotothestructureandefficiencyofpublicexpenditurefromgovernment.Afteranin-depthdiscussiononfacts,originsandpolicyimplicationsofeachissue,sometheoryandpolicythinkingwithlong-lastingsignificanceareraisedforthetransitiondevelopmentofChina.

  • 标签: 可持续发展 中国 经济增长 质量改进 边际效用 人类
  • 简介:Inordertoovercomemanyproblemsandshortcomingsofourthree-dimensionaldesigneducationinmechanicaldrawing,makethestudentsmasterthemoderndesignmethodandtechnologyeasily,modernmodelingmethodandshapingmethodareintroduced,andtheshapingdesigningmethodsofassembled-bodyareanalyzedincludingbasicrequirementsforshapingdesign,commonprinciplesofshapingandshapingdesignmethod.Itwillbehelpfultoimprovethespatialimaginationandmodellingabilityofstudent.

  • 标签: 现代设计方法 建模方法 三维 空间想象能力 成形设计 设计教学
  • 简介:WeobtainsolitonandplanewavesolutionsforthecouplednonlinearSchr?dingerequations,whichdescribethedynamicsofthethree-componentBose-EinsteincondensatesbyusingtheHirotamethod.Meanwhilewefindthatthesystemwhichhasattractiveatomicinteractionwillonlypossessashapechanging(inelastic)collisionpropertyduetointensityredistributionintheabsenceofthespin-exchangeinteraction.Asadiscussedexample,weinvestigatetheone-soliton,two-solitonsolutionsandcollisionaleffectsbetweenbrighttwo-soliotnsolution,whichleadtotheintensityredistribution.

  • 标签: 三组分玻色-爱因斯坦凝聚态 孤波解 非线性薛定谔方程 动力学
  • 简介:Thispaperpresentsanumericalapproachformodelingtheinteractionbetweenmultiplecracksinarectangularplateundercyclicloads.Itinvolvestheformulationoffatiguegrowthofmultiplecracktipsundermixed-modeloadingandanextensionofahybriddisplacementdiscontinuitymethod(aboundaryelementmethod)tofatiguecrackgrowthanalyses.Becauseofanintrinsicfeatureoftheboundaryelementmethod,ageneralgrowthproblemofmultiplecrackscanbesolvedinasingle-regionformulation.Inthenumericalsimulation,remeshingofexistingboundariesisnotnecessaryforeachincrementofcrackextension.Crackextensionisconvenientlymodeledbyaddingnewboundaryelementsontheincrementalcrackextensiontothepreviouscrackboundaries.Asanexample,thenumericalapproachisusedtoanalyzethefatiguegrowthofthreeparallelcracksinarectangularplate.Thenumericalresultsillustratethevalidationofthenumericalapproachandcanrevealtheefectofthegeometryofthecrackedplateonthefatiguegrowth.

  • 标签: 循环荷载作用 平行裂纹 矩形板 疲劳裂纹扩展 边界元法 数值方法
  • 简介:Tochangethecurrentphenomenonof'Beinganarmchairstrategist'intheresearchofasteppingmotor,thevirtualsimulationsystemofsteppingmotorwasdevelopedusingvirtualrealitytechnique.Thebasicprincipleofsteppingmotorwasexpounded.Thedevelopmentstrategyofthesimulationsoftwareisintroduced.Somekeyproblemsandtheirsolutions,includingcoordinatetransformationofrotorandorderofon-offelectricityforstator,wereputforwardinsystemdevelopment.Finally,therearethreevirtualsimulationexamplesoftheon-offelectricitywayinthispaper.Thisworkprovidesavaluableauxiliarytoolforthestudyofthesteppingmotor.

  • 标签: 虚拟仿真系统 三相步进电机 虚拟现实技术 步进电动机 模拟软件 坐标变换
  • 简介:在这篇论文,我们在等级上的现在的一些模块--三使量子化Weylalgebra,它仔细与在一些顶点代数学上的模块有关。在这些模块之中的同晶型班也是坚定的。

  • 标签: 量子论 WEYL代数 同构论 模数 联合代数
  • 简介:Thegeneralequationsofsecondaryinstabilitywithrespecttothree-dimensionalsubharmonicdisturbancesarederivedandappliedtoBlasiusboundarylayerinthepresentpaper.Thetheoreticalresultsofevolutionandspatialdistributionofsubharmonicdisturbancesarecomparedwithexperimentaldata.There-suitsshowtheimportantroleoftheprocessofroutetotransitioninlow-disturbanceenvironments,andindi-catethatspatialmodeismorerationalthantemporalmode.

  • 标签: secondary instability spatial MODE TEMPORAL MODE
  • 简介:InordertocompareandevaluatethreeanimalmodelsforstudyingthepathogenicityofStaphylococcusepidermidisstrains,threeexperimentalanimalmodels,namely,murineintra-venousLD50,mouseforeignbodyinfectionandratcentralvenouscatheter(CVC)infectionmodelswereusedtoassesstherelativevirulenceoftwoS.epidermidisstrains,ATCC12228and97-337.Theresultsfromthreeanimalmodelswerecomparable,indicatingS.epidermidis97-337wasmorevirulentthanstrainATCC12228.TheratCVCinfectionmodelbestmimickedtheconditionsofclinicalpatientswithintmvenonscatheters,andmoreinformationcouldbeobtainedfromthismodel.Weconcludethatdifferentinvivomodelsservefordif-ferentpurposes,andtheratCVCinfectionmodelismostsuitableforstudyingspecificcharacteristicsofcatheterrelatedinfectionscausedbyS.epidermidisstratus.

  • 标签: 表皮葡萄球菌 致病性 动物模型 CVC 流行病
  • 简介:Low-lyingstatesofaverticallycoupledthree-layerquantum-dotsystemarestudied.Eachlayercontainsoneelectron,andthetunnellingofelectronsbetweenlayersisneglected.EffectsoftheinterlayerseparationdandtheexternalmagneticfieldBareevaluatedbynumericalcalculations.Inthestrongcouplingcase(i.e.dissmall),asinasingledot,transitionsoftheangularmomentumLofthetruegroundstatesoccurwhenBincreases,whereasintheweakcouplingcasethetransitiondoesnotoccurandLremainszero.Furthermore,itisfoundthatthevariationofdmayalsoinducetheLtransition.Asaresult,aphasediagramofLofthetruegroundstateisgiveninthed-Bplane.

  • 标签: 半导体 半导体异质结构 三层量子斑点 半导体量子理论
  • 简介:Immersionofautomotivepartsinafluidizedbedoffoundrysandisusedtobothstripthecastingsfreefrommouldingsandandtoheat-treatthecastingsat500?C.Thefluidbedisheatedbyhotgasesfromaburnerdirectedfirstintoaserpentineheatexchangerlocatednearoneside-walloftherectangulartank,andthenintoadistributorconsistingofhorizontalspargerpipeshavingmaintenancestandpipesfixedintotheiruppersurfaces.

  • 标签: 铸造砂 流化床 应用 回收 整合 汽车零部件
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