简介:本文致力于研究非线性中立型延迟积分微分方程隐式Euler方法的收缩性。本文中的Lipschitz数是关于变量t的函数,而不是常数,最终能得到其数值解的结果是收缩的。
简介:Kizmaz[13]学习了差别顺序空格?∞(Δ),c(Δ),和c0(Δ)。几篇文章处理了哪个被围住的m-th顺序差别的序列的集合,对零会聚,或会聚。Altay和Ba?ar[5]并且Altay,Ba?ar,和Mursaleen[7]介绍了Euler顺序空格e(r)0,e(r)c,和e(r)∞分别地。这篇文章的主要目的是介绍空格e(r)0(Δ(m)),e(r)c(Δ(m)),并且e(r)∞(Δ(m))由其m(th)命令差别在Euler空格的所有序列组成e(r)0,e(r)c,和e(r)∞分别地。而且,作者给一些拓扑的性质和包括关系,并且决定空格e(r)的α-,β-,和γ-duals0(Δ(m)),e(r)c(Δ(m)),并且e(r)∞(Δ(m)),并且空格e(r)的Schauder基础0(Δ(m)),e(r)c(Δ(m))。文章的最后节在顺序空间e(r)c(Δ(m)上被奉献给一些矩阵地图砰的描述)。给词调音:顺序m的差别顺序空格;Schauder基础;α-,β-,和γ-duals;矩阵地图砰
简介:TheregularsolutionsoftheisentropicEulerequationswithdegeneratelineardampingforaperfectgasarestudiedinthispaper.Andacriticaldegeneratelineardampingcoefficientisfound,suchthatifthedegeneratelineardampingcoefficientislargerthanitandthegasliesinacompactdomaininitially,thentheregularsolutionwillblowupinfinitetime;ifthedegeneratelineardampingcoefficientislessthanit,thenundersomehypothesesontheinitialdata,theregularsolutionexistsglobally.
简介:Inthispaper,theuniquenessofstationarysolutionswithvacuumofEulerPoissonequationsisconsidered.Throughanonlineartransformationwhichisafunctionofdensityandentropy,thecorrespondingproblemcanbereducedtoasemilinearellipticequationwithanonlinearsourcetermconsistingofapowerfunction,forwhichtheclassicaltheory[4]'[9]oftheellipticequationsleadstheauthorstotheuniquenessresultundersomeassumptionsontheentropyfunctionS(x).Asanexample,theauthorsgettheuniquenessofstationarysolutionswithvacuumofEuler-PoissonequationsforS(x)=|x|θandθ∈{0}∪[2(N-2),+∞).
简介:WestudytheexistenceanduniquenessproblemforthenonhomogeneouspressurelessEulersystemwiththeinitialdensitybeingaRadonmeasure.Ouruniquenessresultisobtainedinthesamespaceastheexistencetheorem.Besides,bycounterexampleweprovethatHuang-Wang'senergyconditionisalsonecessaryforournonhomogeneoussystem.
简介:WeproposeanefficientandrobustalgorithmtosolvethesteadyEulerequa-tionsonunstructuredgrids.ThenewalgorithmisaNewton-iterationmethodinwhicheachiterationstepisalinearmultigridmethodusingblocklower-uppersymmetricGauss-Seidel(LU-SGS)iterationasitssmootherToregularizetheJacobianmatrixofNewton-iteration,weadoptedalocalresidualdependentregularizationasthereplace-mentofthestandardtime-steppingrelaxationtechniquebasedonthelocalCFLnumberTheproposedmethodcanbeextendedtohighorderapproximationsandthreespatialdimensionsinanatureway.Thesolverwastestedonasequenceofbenchmarkprob-lemsonbothquasi-uniformandlocaladaptivemeshes.Thenumericalresultsillustratedtheefficiencyandrobustnessofouralgorithm.
简介:LetXt(x)bethesolutionofstochasticdierentialequationswithsmoothandboundedderivativescoeffcients.LetXnt(x)betheEulerdiscretizationschemeofSDEswithstep2-n.Inthisnote,weprovethatforanyR>0andγ∈(0,1/2),supt∈[0,1],|x|≤R|Xnt(x,ω)-Xt(x,ω)|≤ξR,γ(ω)2-nγ,n≥1,q.e.,whereξR,γ(ω)isquasi-everywherefinite.
简介:TheauthorsconsidertheEulerequationsforacompressiblefluidinonespacedimensionwhentheequationofstateofthefluiddoesnotfulfillstandardconvexityassumptionsandviscosityandcapillarityeffectsaretakenintoaccount.Atypicalexampleofnonconvexcon-stitutiveequationforfluidsisVanderWaals'equation.Thefirstordertermsofthesepartialdifferentialequationsformanonlinearsystemofmixed(hyperbolic-elliptic)type.Foraclassofnonconvexequationsofstate,anexistencetheoremoftravelingwavessolutionswitharbitrarylargeamplitudeisestablishedhere.Theauthorsdistinguishbetweenclassical(compressive)andnonclassical(undercompressive)travelingwaves.ThelatterdonotfulfillLaxshockinequali-ties,andarecharacterizedbytheso-calledkineticrelation,whosepropertiesareinvestigatedinthispaper.
简介:考虑动态输出反馈控制下Euler-Bernoulli梁的振动抑制问题,证明了系统算子生成的C0-半群,不指数稳定但渐近稳定.且当初值充分光滑时,利用Riesz基方法估计出系统能量多项式衰减.