简介:Numericalsimulationofantennaeisatopicincomputationalelectromagnetism,whichisconcernedwiththenumericalstudyofMaxwellequations.BydiscreteexteriorcalculusandthelatticegaugetheorywithcoefficientR,weobtaintheBianchiidentityonprismlattice.Bydefininganinnerproductofdiscretedifferentialforms,wederivethesourceequationandcontinuityequation.ThoseequationscomposethediscreteMaxwellequationsinvacuumcaseondiscretemanifold,whichareimplementedonJavadevelopmentplatformtosimulatetheGaussianpulseradiationonantennaes.
简介:在这份报纸,我们证明在范畴之间有一个自然等价?与给定的周期的模块的过滤的复杂性1的Koszul模块的1(x)作为一个m鈥揹imensional向量空格的外面的代数学螞=鈭的因素模块,并且有限鈥揹imensional的范畴局部地m鈥?的多项式代数学的nilpotent模块1个变量。关键词外面的代数学-Koszul模块-复杂性先生(2000)题目分类16G70-在他们的第60生日奉献给教授Roberto市场铆nez鈥揤illa和RaymondoBautista的16D90这研究被NSFC#10371036并且由湖南的省的教育部的关键工程#2A024部分地支持
简介:这份报纸与寓言的退化为概括混合方程处理外面的Tricomi问题。第一,为方程的问题的答案的表示被给,然后答案的唯一和存在被一个新方法证明。关键词外面的Tricomi问题-混合类型的方程-二倍地连接的领域先生(2000)题目分类35N99这研究被NSFC(号码10471149)支持
简介:Bamboodeteriorationcausedbylightbecomesasignificantproblemasapplicationofbambooextendsfromindoortooutdoor.Thecolorandroughnessofbambooaretwoimportantexteriorperformances.ThisstudyfocusedonUVresistantnanocompositescoatingsforexterioruseandwhataimedtofindaformulationwhichcouldenhancethedurabilityofbamboo.Fourkindsoffilm-formingmaterialsandfourkindsofnanoparticleswereusedtoimprovebambooexteriorperformance.Thecolorandroughnessofnanocompositescoatingsweremeasuredduringacceleratedweathering.Artificialagingtimewas174hatthetemperatureof50℃.TheexperimentshowednanocompositescoatingshadsignificantimprovementinUV-shieldingandnearlyallthesamplespresentedadarkeningtendencyinΔL*andincreasingtendencyinΔa*,ΔE*andΔRa.TheorthogonalexperimentobtainedtheleastchangeincolorandRawhichcouldbeachievedwithnanocompositescoatingmadebymelamineresinandTiO2whena*wasconsideredasanimportantindex.Film-formingmaterialwastheonlyfactorwhichhadsignificantinfluenceoncolorandroughnesswhena*wasnotconsideredasimportantindex,thenmelamineresinwasthebestchoice.
简介:在最后十年,有限元素外面的演算(FEEC)为线性混合变化问题,他们由混合方法的数字近似,和他们的错误分析作为一个一般框架被开发了。在FEEC的基本途径,在2006和2010在二篇精液的文章由阿诺德,Falk,和Winther开创了,在Hilbert建筑群的背景解释这些问题,导致更一般、完全的理解。在最后五年,FEEC框架被扩大了到问题的一个更宽广的集合。由于在2012的Holst和斯特恩,一如此的延期到过分析和任意的空间尺寸的Riemannianmanifolds上的线性、几何的椭圆形的部分微分方程的数字近似有变化的罪的问题,允许。他们的结果实质地概括在几的有限元素近似理论尊重的存在表面。在2014,吉勒特,Holst,和朱在另一个方向扩大了FEEC,也就是到由为寓言、夸张的操作员为椭圆形的操作员把FEEC框架与古典途径相结合的寓言、夸张的进化系统,由把解决方案看作到进化问题躺在Bochner空格(珍视的parametrized弄弯的Banach空间的空格)。为寓言的进化问题开发一个FEEC理论上的相关工作被阿诺德和陈也独立地做了。在这篇文章,我们在Riemannianmanifolds上扩大朱吉雷泰霍尔斯特和Arnold陈的工作到进化问题,通过为分析变化的罪的Holst和斯特恩开发的框架的使用。我们证实一个priori错误在公寓从更早的工作估计那还原剂到结果(非犯罪)背景。一些数字例子也被举。
简介:ThisarticledealswiththedegenerateparabolicequationsinexteriordomainsandwithinhomogeneousDirichletboundaryconditions.Weobtainthatpc=(σ+m)n/(n-σ-2)isitscriticalexponentprovidedmax{-1,[(1-m)n-2]/(n+1)}<σ
简介:AfiniteelementmethodforthesolutionofOseenequationinexteriordomainisproposed.Inthismethod,acircularartificialboundaryisintroducedtomakethecomputationaldomainfinite.Then,theexactrelationbetweenthenormalstressandtheprescribedvelocityfieldontheartificialboundarycanbeobtainedanalytically.Thisrelationcanserveasanboundaryconditionfortheboundaryvalueproblemdefinedonthefinitedomainboundedbytheartificialboundary.Numericalexperimentispresentedtodemonstratetheperformanceofthemethod.
简介:Inthispaper,howtocomputetheeigenfrequenciesofthestructurescomposedofaseriesofinclinedcablesisshown.Thephysicsofaninclinedcablecanbecomplicated,sosolvingthedifferentialequationsevenapproximatelyisdifficult.However,ratherthansolvingthesystemof4first-orderequationsgoverningthedynamicsofeachcable,thegoverningequationsareinsteadconvertedtoasetofequationsthattheexteriormatrixsatisfies.Therefore,theexteriormatrixmethod(EMM)isusedwithoutsolvingtheoriginalgoverningequations.Eventhoughthisproducesasystemof6first-orderequations,thesimpleasymptotictechniquestofindthefirstthreetermsoftheperturbativesolutioncanbeused.Thesolutionscanthenbeassembledtoproducea6×6exteriormatrixforacablesection.Thematricesforeachcableinthestructurearemultipliedtogether,alongwiththeexteriormatricesforeachjoint.Therootsoftheproductgiveustheeigenfrequenciesofthesystem.
简介:1.IntroductionNonlinearGalerkinmethodsaremultilevelschemesforthedissipativeevolutionpartialdifferentialequations.Theycorrespondtothesplittingsoftheunknownu:u=y+z)wherethecomponentsareofdifferentorderofmagnitudewithrespecttoaparameterrelatedtothespati...