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40 个结果
  • 简介:Thispaperstudiestheiterationsofholomorphicself-mapswhichhavenonwanderingpointsovergeneralpseudoconvexdomainsisC^2.TheauthorsgiveespeciallyaDenjoy-Wolff-typetheoremonpseudoconvexdomainswithreal-analyticboundaries,orevenmoregeneral,ondorpainsoffinitetype.

  • 标签: 迭代法 极限球面 有限领域 非偏移点 强伪凸 复变流形
  • 简介:Wefindanasymptoticexpressionforthecharacteristictimescalesofdecorrelationprocessesinweaklycompressibleandisothermalturbulence.ThisresultisusedintheEddy-DampedQuasi-NormalMarkovianequationtoderivethescalingsofcompressibleenergyspectra:(1)iftheacousticwavesaredominant,thecompressibleenergyspectraexhibit?7/3scaling;(2)iflocaleddystrainingisdominant,thecompressibleenergyspectraarescaledas?3.Meanwhile,theenergyspectraofincompressiblecomponentsdisplaythesamescalingof?5/3asthoseinincompressibleturbulence.Thedirectnumericalsimulationsofweaklycompressibleturbulenceareusedtoexaminethescaling.

  • 标签: COMPRESSIBLE TURBULENCE Energy spectra TWO-POINT CLOSURE
  • 简介:在这份报纸,我们建立周期的减小(CR)的集中结果为一个班的算法弱没有第n个最大的特征值的部分复合都是的假设的二次的矩阵多项式等于到2的overdamped。我们的结果能被郭,Higham和Tisseur认为是那的补充[暹罗J。矩阵肛门。Appl,30(2009),pp。1593-1613]。数字例子显示CR算法的集中行为被我们的理论大部分支配。

  • 标签: 还原算法 收敛性 过阻尼 二次方程式 循环 多项式算法
  • 简介:Therearethreemainproblemsintheweaklynonlineartheoryofhydrodynamicstability:(1)Thera-diusofconvergencewithrespecttotheperturbationparameteristoosmallandthereisnoconcreteestimationforit.(2)Thesolutionhasaspecialstructure,thusingeneral,itcannotsatisfytheinitialconditionposedbymanypracticalproblems.(3)Whenthelinearpartofitssolutiondoesnotcorrespondtoaneutralcase.therearemorethanonewayindeterminingtheLandauconstants,andpracticallynooneknowswhichisthebestway.Inthispaper,problems(1)and(2)aresolvedtheoretically,andwaysforitsimprovementhavebeenproposed.Bycomparingthetheoreticalresultswiththoseobtainedbynumericalsimulations,problem(3)hasalsobeenclari-fied.

  • 标签: HYDRODYNAMIC stability WEAKLY nonlinear theroy modified
  • 简介:TheECRwaveheatingisnowaroutinemethodforplasmaheatingandprofilecontrolinfusiondevicesandalsoinplasmaapplications.TheoreticalstudyofECRwavepropagationandabsorptionbeganveryearlyin1950's.Basictheoreticalworkhadaccomplishedin1970~1980.Fortoroidaldeviceslikethetokamak,thefundamentalO-modeandX-modewithnearlyperpendicularpropagationwereusedveryoften.ForpureO-modeandX-modewithkx=O,

  • 标签: ECR波 传播方式 吸收方式 等离子体 相对论
  • 简介:ThispapeerstudiestheknowndensitytheoremofArrow-Barankin-Blackwell.Thefollowingmainresultisobtained:IfXisaHausdorfflocallyconvexTopologicalspaceandCbelongtoXisaclosedconvexconewithboundedbase,thenforeverynonemptyweaklycompactconvexsubsetA,thesetofpositiveproperefficientpointsofAisdenseinthesetofefficientpointsofA.

  • 标签: 正常有效点 凸锥 豪斯多夫空间 紧集
  • 简介:在这份报纸,我们与线性摩擦抑制和对排水量方程起作用的分布式的延期考虑一个维的Timoshenko系统。在延期和波浪速度的重量上的合适的假设下面,我们建立通过摩擦抑制的驱散是足够强壮的一致地甚至面对延期稳定系统的系统和表演的well-posedness。

  • 标签: TIMOSHENKO 系统 时滞反馈 耗散 衰减 摩擦阻尼
  • 简介:Inthispaperthedynamicsofaweaklynonlinearsystemsubjectedtocombinedparametricandexternalexcitationarediscussed.TheexistenceoftransversalhomoclinicorbitsresultinginchaoticdynamicsandbifurcationareestablishedbyusingtheaveragingmethodandMelnikovmethod.Numericalsimulationsarealsoprovidedtodemonstratethetheoreticalanalysis.

  • 标签: Bifurcation chaos TRANSVERSAL HOMOCLINIC orbit
  • 简介:作者首先给定义微弱地堕落(K1,K2)用外面的力量和外面的微分形式的技术的-quasiregular地图砰,然后,用McShane扩展的方法,有用不平等被获得,它能被用来导出自我改进的整齐。

  • 标签: 拟正则映射 微分 数学 退化方法
  • 简介:Coherentdiffractionimaging(CDI)andptychographytechniquesbypassthedifficultyofhavinghigh-qualityopticsinX-raymicroscopybyusinganumericalreconstructionoftheimagethatisobtainedbyinvertingthediffractedintensityrecordedbyacharge-coupleddevicearray.However,thereconstructionoftheimagefromtheintensitydataobtainedfromaweaklydiffractingspecimenisknowntobedifficultbecauseoftheobviousreductioninsignal-to-noiseratio(SNR).Inthiscase,thespecimenonlyslightlymodifiestheprobediffractionpattern,resultingindifficultyintheidentificationofthedetailedstructureofthespecimenfromthereconstructedimagebecauseofthepoorcontrastandsharpnessoftheimage.Toaddressthissituation,amodificationintheimageretrievalalgorithmsusedintheiterativereconstructionoftheimageissuggested.Thismodificationshoulddoublethepresenceofhighspatialfrequenciesinthediffractionpatterntoenhancethecontrastandedgedetectioninexistingimagingtechniques.

  • 标签: 衍射成像 高对比度 标本 相干 图像重建 电荷耦合器件
  • 简介:在这研究,在参量的刺激下面的twodimensional震荡系统的几乎肯定稳定性的足够的条件被调查。考虑的系统被假定由二个微弱地联合的分系统构成。开车行动被认为是静止随机的过程令人满意各态历经的性质。二次的形式的性质与界限一起被使用让特征值获得,在一种关上的形式,为系统的几乎肯定的稳定性的足够的条件。关键词几乎肯定的稳定性-各态历经的过程-为特征值汉语图书馆分类O3252000数学题目分类15A22固定-15A18-15A39由美国的国家科学基金支持的陈丽群工程交流了(没有。CMMI0758632)

  • 标签: 关键词几乎肯定的稳定性 各态历经的过程 为特征值跳
  • 简介:Inthispaper,wediscusstheconceptoffixedpointcurveforlinearinterpolationsofweaklyinwardcontractionsandestablishnecessaryconditionforanonexpansivemappingtohaveapproximatefixedpointproperty.

  • 标签: 不动点性质 收缩 曲线 定点 线性插值
  • 简介:Inthispaper,usingthecontextofcompletepartialmetricspaces,somecommonfixedpointresultsofmapsthatsatisfythegeneralized(φ,ψ)-weakcontractiveconditionsareobtained.Ourresultsgeneralize,extend,unify,enrichandcomplementmanyexistingresultsintheliterature.Examplearegivenshowingthevalidatyofourresults.

  • 标签: 度量空间 公共不动点 压缩映射 广义 压缩条件 固定点
  • 简介:Inthispaper,thetheoryofmajorefficiencyformultiobjectiveprogrammingisestablished.Themajor-efficientsolutionsandweaklymajor-efficientsolutionsofmultiobjectiveprogramminggivenhereareParetoefficientsolutionsofthesamemultiobjectiveprogrammingproblem,buttheconverseisnottrue.Inaceratinsense,thesesolutionsareinfactbetterthananyotherParetoefficientsolutions.Somebasictheoremswhichcharacterizemajor-efficientsolutionsandweaklymajor-efficientselutionsofmultlobjectiveprogrammingarestatedandproved.Furthermore,theexistenceandsomegeometricpropertiesofthesesolutionsarestudied.

  • 标签: 多目标规划 弱较多有效解 较多有效解 多目标程序设计
  • 简介:在这篇论文,我们基于没有任何凸状结构,在拓扑的空格印射的微弱地概括的KKM建立一些新概括KKM类型定理。作为应用,一些得最高分的战略不平等和为一个抽象概括向量平衡问题的平衡点的一条存在定理在拓扑的空格被证明。在这篇论文介绍的结果在最近的文学统一并且概括一些已知的结果。关键词微弱地概括了印射的KKM-概括KKM类型定理-微弱地概括了斜伪凸-(W,S,K)印射对-概括向量平衡2000苏布杰克特先生分类91B50-91A44-91A13由国家天赋支持了中国(号码10771058)和湖南的科学基础省的自然科学基础(号码09JJ6013)。

  • 标签: KKM型定理 KKM映射 广义 应用 极大极小不等式 拓扑空间
  • 简介:NonlinearSchrodingerequation(NSE)arisesinmanyphysicalproblems.Itisaveryimportantequation.Alotofworksstudiedthewellposed,theexistenceofsolutionofNSEetc.Andtherearemanyworksstudiedthenumericalmethodsforit.Recently,sincethedevelopmentofinfinitedimensionaldynamicsystemthedynamicalbehaviorofNSEhasbeeninvestigated.Thepaper[1]studiedthelongtimewellposedness,theexistenceofuniversalattractorandtheestimateofLyapunovexponentforNSEwithweaklydamped.Atthesametimeitwasneedtostudythelargetimenewcomputationalmethodsandtodiscussitsconvergenceerrorestimate,theexistenceofapproximateattractorsetc.InthispapewestudytheNSEwithweaklydamped(1.1).Weassume,where0<λ<2isaconstant.Ifwewishtoconstructthehigheraccuracycomputationalscheme,itwillbedifficultthatstaighfromtheequation(1.1).Thereforewestartwith(1.4)andusefullydiscreteFourierspectralmethodwithtimedifferencetodisscus

  • 标签: nonlinear SCHRODINGER equation INFINITE dimensional dynamic
  • 简介:在这份报纸,我们给微分形式的弱WT2班的定义,然后获得它的弱反向的H?lder不平等。作为应用,我们给更高的integrability结果的一个其他的证明弱A泛音张肌由于B。Stroffolini。

  • 标签: 微分形式 张量积 调和 逆Holder不等式