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500 个结果
  • 简介:In[1],Dingetal.studiedthenonhomogeneousBurgersequationThispaperwillprovethatwhenμ→0thesolutionof(1.1)willapproachthegeneralizedsolutionofTheauthorsnoticethattheequation(1.2)isbeyondthescopeofinvestigationsbyOleinikO.in[2].Thesolutionshereareunboundedingeneral.Thepaperalsostudiestheδ-wavephenomenonwhen(1.2)isjointedwithsomeotherequation.

  • 标签: 黏滞性方法 非齐次Burgers方程 广义解 Hopf方程 delta波 CAUCHY问题
  • 简介:Thispaperpresentsanewstrategyofusingtheradialintegrationboundaryelementmethod(RIBEM)tosolvenon-homogeneousheatconductionandthermoelasticityproblems.Inthemethod,theevaluationoftheradialin-tegralwhichisusedtotransformdomainintegralstoequivalentboundaryintegralsiscarriedoutonthebasisofelementalnodes.Asaresult,thecomputationaltimespentinevaluatingdomainintegralscanbesavedconsiderablyincomparisonwiththeconventionalRIBEM.Threenumericalexamplesaregiventodemonstratethecorrectnessandcomputationalefficiencyoftheproposedapproach.

  • 标签: 边界元法 计算时间 非齐次问题 径向 基础 节点
  • 简介:Inthispaper,aclassofnewimmersedinterfacefiniteelementmethods(IIFEM)isdevelopedtosolveelasticityinterfaceproblemswithhomogeneousandnon-homogeneousjumpconditionsintwodimensions.Simplenon-body-fittedmeshesareused.Forhomogeneousjumpconditions,bothnon-conformingandconformingbasisfunctionsareconstructedinsuchawaythattheysatisfythenaturaljumpconditions.Fornon-homogeneousjumpconditions,apairoffunctionsthatsatisfythesamenon-homogeneousjumpconditionsareconstructedusingalevel-setrepresentationoftheinterface.Withsuchapairoffunctions,thediscontinuitiesacrosstheinterfaceinthesolutionandfluxareremoved;andanequivalentelasticityinterfaceproblemwithhomogeneousjumpconditionsisformulated.Numericalexamplesarepresentedtodemonstratethatsuchmethodshavesecondorderconvergence.

  • 标签: 有限元方法 非齐次 接口 弹性 跳跃 贴体网格
  • 简介:Inthispaperwediscussthediscrete,timenon--homogeneousdiscountedMarkoviandecisionprogramming,wherethestatespaceandallactionsetsarecountable.Supposethattheoptimumvaluefunctionisfinite.Wegivethenecessaryandsufficientconditionsfortheexistenceofanoptimalpolicy.Supposethattheabsolutemeanofrewardsisrelativelybounded.Wealsogivethenecessaryandsufficientconditionsfortheexistenceofanoptimalpolicy.

  • 标签: absolute 召亡 加感 EVERYWHERE CONVEX 七艺
  • 简介:Thespectraldensityofthequasi-homogeneous(QH)lighthasbeenknownwhenitscattersonQHmediaorpropagatesinfreespace.ThecasethatQHsourcesaresurroundedbyQHmediaisproposedinthispaper.Undertheparaxialapproximation,thespectraldensityoftheQHlightpropagatingthroughQHmediaisderived.AmodifiedscalinglawforthepropagationoftheQHlightthroughQHmediaisalsoobtained.Thislawalsoholdstrueinthefarfieldbeyondtheparaxialapproximation.

  • 标签: 均匀介质 传播媒体 均相 繁殖 频谱密度 空间散射
  • 简介:在这份报纸,作者计算同类的Grushin泛音函数的空格的尺寸,并且给他们的一个直角的基础。而且,作者描述这些同质的Grushin泛音基础的节的曲线。作为直角的基础的一个应用程序,作者为Grushin操作符证明一条Liouville类型定理,那是Grushin泛音函数如果如此的一个函数的频率等于某常数,是同类的多项式。

  • 标签: Grushin 操作员 频率功能 同类的多项式
  • 简介:Inthepaperhomogeneousparticleboardofwheatstrawisresearched.Theresultshowsthetechnologyofhomogeneousparticleboardfromcostandquality.Themoisturecontentofstrawparticleis2.0%~2.5%.Thetemperatureofhot-pressingis150℃.Thetimeofhot-pressingis48sec/mm(panelthickness).TheratiobetweenMDIandUFis0.40.Thegluecontentforsurfacelayerofwheatstrawparticleis10%(MDI2.86%,UF7.14%).Thegluecontentforcorelayerofwheatstrawparticleis8%(MDI2.29%,U...

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  • 简介:这份报纸被奉献在同类的组X上学习加权的强壮的空间的原子分解。一些结果是在欧几里德几何学的泛音分析学习的对象的扩展。

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  • 简介:Inthispaper,usingspectraldecimation,weprovethatthe“hotspots”conjectureholdsonaclassofhomogeneoushierarchicalgasketsintroducedbyHambly,i.e.,everyeigenfunctionofthesecond-smallesteigenvalueoftheNeumannLaplacian(introducedbyKigami)attainsitsmaximumandminimumontheboundary.

  • 标签: NEUMANN LAPLACIAN "hot spots"conjecture HOMOGENEOUS HIERARCHICAL
  • 简介:包括的有效策略弄短,链扩展,积极的组介绍和同类的反应战术,被采用与纤维素醋酸盐(CA)修改多围的碳nanotubes(MWNT)。由利用2,4,6-trichloro-1,3,5-triazine,特殊,MWNT(MWNT-triazine)的反应中介被获得。MWNT-triazine的合适的溶解度帮助让同类的修正成为现实。在在MWNT-triazine和氢氧根的氯化物原子之间的那反应在CA组织的进一步验证的详细描述贡献了MWNT-CA的形成结合。新奇MWNT-CA由碳(76.3%)组成,氧(18.4%)和氮(5.3%)。与42.8wt%的一个依附nanotube的CA内容,MWNT-CA在DMSO,NMP,DMF和DMAc是容易地可溶的。CA-based修正线路的证实可能导致为特定的吸着和隔离瞄准的研究。

  • 标签: 多壁碳纳米管 醋酸纤维素 均相反应 改性 二甲基甲酰胺 三氯三嗪
  • 简介:M(J,{msns},{cs})bethecollectionofCartesianproductsoftwohomogenousMoransetswiththesameratios{cs}whereJ=[0,1]×[0,1].ThenthemaximalandminimalvaluesoftheHausdorffdimensionsfortheelementsinMareobtainedwithoutanyrestrictionon{msns}or{cs}.

  • 标签: 齐次MORAN集 笛卡尔积 尺寸 HAUSDORFF 笛卡尔乘积 最小值
  • 简介:Thereactionmechanismsofdienepolymerizationwithhomogeneousrareearthcatalystarestudiedbymeansofthespectraof1H-NMR,one-andtwo-dimensions13C-NMR.BasedonthedataofaboveNMRspectra,itisproposedthatthepolymerizationreactionproceedsaccordingtothefollowingmechanism:η4-diene(cis-(?)trans-)andη3-allyl(syn-(?)anti-).

  • 标签: Reaction mechanism DIENE COORDINATION POLYMERIZATION HOMOGENEOUS
  • 简介:ThispaperintroducesaunifiedoperatortheoryapproachtotheabstractFourieranalysisoverhomogeneousspacesofcompactgroups.LetGbeacompactgroupandHbeaclosedsubgroupofG.LetG/HbetheleftcosetspaceofHinGandμbethenormalizedG-invariantmeasureonG/HassociatedtotheWeil'sformula.Then,wepresentageneralizedabstractframeworkofFourieranalysisfortheHilbertfunctionspaceL~2(G/H,μ).

  • 标签: 傅立叶分析 陪集空间 齐次 紧致 算子理论 不变测度