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32 个结果
  • 简介:这篇文章介绍hypersingular积分的近似?abg(x)(x-t)dx并且?abg(x)|x-t|有任意的单个点t的dx(一,b)并且否定部分数字<-1。这些一般扩大对hypersingular积分的一个大范围适用,包括在文学和还没被探讨的另外的重要的讨论的两流行hypersingular积分。相应中间矩形的公式和推测,能以相当直接的方法计算,被调查。数字例子被提供说明数字方法的特征并且验证理论结论。

  • 标签: 积分 否定 分代 数字方法 分数
  • 简介:Inthispaperweconsidersomerelatednegativehypergeometricdistributionsarisingfromtheproblemofsamplingwithoutreplacementfromanurncontainingballsofdifferentcoloursandindifferentproportionsbutstoppingonlyaftersomespecificnumberofballsofdifferentcolourshavebeenobtained.Withtheaidofsomesimplerecurrencerelationsandidentitiesweobtaininthecaseoftwocoloursthemomentsforthemaximumnegativehypergeometricdistribution,theminimumnegativehypergeometricdistribution,thelikelihoodrationegativehypergeometricdistributionandconsequentlythelikelihoodproportionalnegativehypergeometricdistributiuon.TotheextentthatthesamplingschemeisapplicabletomodellingdataasillustratedwithabiologicalexampleandinfactmanysituationsofestimatingBernoulliparametersforbinarytraitswithinafinitepopulation,theseareimportantfirst-stepresults.

  • 标签: 数理统计 加权可能性 负超几何分布 最大值
  • 简介:Inthispaperweconsidertheclass∑[p,α,β,k,c]consistingofanalyticfunctionswithnegativecoefficientsandfixedsecondcoefficient.Theobjectofthepresentpaperistogivecoefficientestimates,convexlinearcombinations,somedistortiontheoremsandradiiofstarlikenessandconvexityforf(z)intheclass∑[p,α,β,k,c].

  • 标签: 分析函数 亚纯函数 否定系数 变形理论
  • 简介:在这篇论文,我们为随机的变量的随机的和扩大并且改善大偏差的一些结果。让{Xn;n≥1}是有普通重尾巴的分发功能F和有限吝啬的μ∈的非否定、独立、相等分布式的随机的变量的一个序列R+,{N(n);n≥0}是有参数p∈的否定二项式的分布式的随机的变量的一个序列(0,1),n≥0,让{M(n);n≥0}是有紧张λ>的一个泊松过程0。想{N(n);n≥0},{Xn;n≥1}并且{M(n);n≥0}是互相独立的。给S(n)写=。在假设F∈下面C,我们证明一些是大偏差结果。这些结果能在保险和金融被用于某些问题。

  • 标签: 可靠性理论 二项式 证明 数理统计
  • 简介:Inthispaper,weconsidertheBrownianmotionriskmodelwithinterest.TheLaplacetransformofthefirstexittimefromtheupperbarrierbeforehittingthelowerbarrierisobtained.Usingtheobtainedresultandexploitingthelimitationidea,wederivetheLaplacetransformoftotaldurationofnegativesurplus.

  • 标签: 持续时间 风险模型 布朗运动 盈余 拉普拉斯变换 权益
  • 简介:这篇文章的目的是为不可压缩的magnetohydrodynamic方程开发并且分析最少平方的近似。最少平方的有限元素方法的主要优点是它不受到所谓的Ladyzhenskaya相当於Mr或Sir的称谓?ka-Brezzi(LBB)状况。作者采用包含与在H-1的内部产品有关的一个分离内部产品的最少平方的functionals(蠅)。

  • 标签: 磁流体动力学 旋涡状态 负模 最小二乘混合有限元法
  • 简介:Withtheadventofleft-handedmagneticmaterials,itisdesirabletodevelophigh-performancewavedevicesbasedontheirnovelpropertiesofwavepropagation.Thisletterreportsthespecialpropertiesofelasticwavepropagationinmagnetoelasticmultilayeredcompositeswithnegativepermeabilityascomparecdtothoseincounterpartstructureswithpositlvepermeability.Thesenovelpropertiesofelasticwavesarediscernedfromthediversifieddispersioncurves,whichrepresentthepropagationandattenuationcharacteristicsofelasticwaves.Tocomputethesedispersioncurves,themethodofreverberation-raymatrixisextendedfortheanalysisofelasticwavesinmagnctoelasticmultilayeredcomposites.Althoughonlytheresultsofasinglepiezomagneticandabinarymagnetoelasticlayerswithmechanicallyfreeandmagneticallyshortsurfacesaswellaspelrfectinterfaceareillustratedinthenumericalexamples,theanalysisisapplicablelomagnetoelasticmultilayeredstructureswithotherkindsofboundaries/interfaces.

  • 标签: 多层复合材料 弹性波传播 负磁导率 回传射线矩阵法 磁多层结构 传播特性
  • 简介:Small-angleX-rayscattering(SAXS)usingsynchrotronradiationasX-raysourcehasbeenemployedtocharactcizcthemicroscopicstructrureoforgano-modifiedmesoporousmolecularsieves(organo-MSU-X)preparedbyaone-pottemplate-directedsynthesis.ItisshownthattheSAXSprofileishardlyconstantwithPorod’slawshowinganegativeslope,i.e.,negativedeviation.Thissuggeststhatthereisdiffuseinterfaciallayerlocatedbetweentheporesandthematrix.Thissuggeststhattheorganicgroupsremaincovalentlylinkedtothematrix,asindicatedby^29SiCPMASNMRandFT-IR.Theaveragethicknessoftheinterfaciallayerwasfoundtobeabout1nmforeachofthethreesampleswithdifferentkindsandthesameamounts(20?oforganicgroups.Thiskindofmaterialhasalsobeenprovedtopossessbothsurfaceandmassfractalstructureoftheamophousporoussilicamaterials.2001ElsevierScienceB.V.Allrightsreserved.

  • 标签: 中孔材料 SAXS 小角X射线散射分析 界面层 结构特征 有机中孔分子筛
  • 简介:Inthiswork,negativedielectricnematicliquidcrystalSLC12V620-400,chiraldopantS811,andlaserdyeDCMareusedtopreparedye-dopedchiralnematicliquidcrystallasersample.Inordertoinvestigatetemperature-tunablelasinginnegativedielectricchiralnematicliquidcrystal,wemeasurethetransmissionandlasingspectrumofthissample.Thephotonicbandgap(PBG)isobservedtoredshiftwithitswidthreducingfrom71.2nmto40.2nm,anditsshort-wavelengthbandedgemoves55.3nmwhilethelong-wavelengthbandedgeonlymoves24.9nm.Thewavelengthofoutputlaserisfoundtoredshiftfrom614.4nmat20°Cto662.8nmat67°C,whichisverydifferentfromthepreviousexperimentalphenomena.Therefractiveindices,parallelandperpendiculartothedirectorinchiralnematicliquidcrystalhavedifferentdependenciesontemperature.Theexperimentshowsthatthepitchofthischiralnematicliquidcrystalincreaseswiththeincreaseoftemperature.ThedecreaseinthePBGwidth,differentshiftsofbandedges,andtheredshiftoflaserwavelengtharetheresultsofrefractiveindiceschangeandpitchthermalelongation.

  • 标签: 可调谐激光 负介电常数 向列液晶 手性 温度 激光染料
  • 简介:周和冯摆姿势一在2004的自我类似的集合上的conjecture。在这篇论文,一个自我类似的集合被构造它有最好盖住但是它的自然盖住不是最好的。因此,我们确实把一个否定答案给conjecture。

  • 标签: 自相似集 开集条件 猜想 否定 覆盖
  • 简介:在线上的顺序三的方程被显示出全球性好的为概括Korteweg-deVries的起始的价值问题为不平的数据摆姿势。我们的证明基于Colliander,龙骨,Staffilani,Takaoka,和道介绍的多线性的估计和我方法。

  • 标签: KDV方程 多线性估计 SOBOLEV空间 负指数
  • 简介:NanoporousanataseTiO2(np-TiO2)electrodeshavebeendevelopedviatheanodizationoftitaniumfoilsinfluoridecontainingelectrolytes,anditsapplicationinrechargeablelithium-ionbatteries(LIBs)wasinvestigated.Fourdifferenttypesofnp-TiO2electrodeswithdifferentporediametersof14.7±8.2nm,12.8±6.8nm,11.0±5.5,and26.7±13.6nmwerefabricatedforevaluatingtheeffectofnanoporouscharacteristicsontheLIBperformance.Thedischargecapacityofthefourbatterytypes1,2,3,and4were132.7mAhg-1,316.7mAhg-1,154.3mAhg-1,and228.4mAhg-1,respectively.Inaddition,theseelectrodes1,2,3,and4exhibitedreversiblecapacityof106.9mAhg-1after295th,180.9mAhg-1after220th,126.1mAhg-1after150th,and206.7mAhg-1after85thcycleatarateof1C,respectively.Itwasnotedthatthecycliclifeofthebatterieshadaninverserelationship,andthecapacityhadaproportionalrelationshiptotheporediameter.Theenhancedelectrochemicalperformanceofthenanoporouselectrodescanbeattributedtotheimprovedconductivityandtheenhancedkineticsoflithiuminsertion/extractionatelectrode/electrolyteinterfacesbecauseofthelargespecificsurfaceareaofnp-TiO2electrodes.

  • 标签: 纳米二氧化钛 锂离子电池 电化学性能 多孔电极 负极 放电容量