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35 个结果
  • 简介:我们扩大由于Peng-Terng,Wei-Xu和Suh-Yang拧定理的分级的弯曲。让M一个n维的协议是在Sn+1的最小的hypersurface令人满意的Sf4吗?f32$\tfrac{1}{n}$\tfrac{1}{n}S3,在S是第二个基础的摆平的标准的地方,M形成,并且fk$\sum\limits_i{\lambda_i^k}$\sum\limits_i{\lambda_i^k}并且i(1in)是M的主要弯曲。我们证明那在那里存在仅仅取决于n的积极经常的(n)(n/2)以便如果nSn+(n),那么Sn,即,吗M是克利福德花托之一$S^k(\sqrt{\tfrac{k}{n}})\timesS^{n-k}(\sqrt{\tfrac{{n-k}}{n}})$S^k(\sqrt{\tfrac{吗k}{n}})\timesS^{n-k}(\sqrt{\tfrac{{n-k}}{n}})为1kn?1。而且,如果S是一个常数,我们证明那,那么在那里存在积极经常的(n)(n?$\tfrac{2}{3}$\tfrac{2}{3}仅仅取决于n以便如果nS

  • 标签: 单位球面 圆环 刚性 第二基本形式 标量曲率 极小曲面
  • 简介:Theunitcircleproblemistheproblemoffindingthenumberofeigenvaluesofanon-Hermitianmatrixinsideandoutsidetheunitcircle.Toreducethecostofcomputingeigenvaluesfortheproblem,adirectmethod,whichisanalogoustothatgivenin[5],isproposedinthispaper.

  • 标签: NON-HERMITIAN matric EIGENVALUES MATRIX POLYNOMIAL
  • 简介:IMPCSRRFGroupcooperatingwithBINPhasfulfilledthefollowingprojects.PCIbasedRFsignalgenerator;PLDcenteredRFstationinterlockandsurveillanceunit;Highfrequencyanalogsignalprocessingunits;CVIandWindowsplatformbasedmonitorandoperationinterface.

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  • 简介:没有衍生物的使用,在这份报纸,我们在联合起来的球建立-Bloch功能的相等的描述,它概括并且改善Nowak,赵,Wulan和李的结果。

  • 标签: 等价刻画 单位球 函数
  • 简介:InthispaperthelimitingdistributionoftheleastsquareestimatefortheautoregressivecoefficientofanearlyunitrootmodelwithGARCHerrorsisderived.Sincethelimitingdistributiondependsontheunknownvarianceoftheerrors,anempiricallikelihoodratiostatisticisproposedfromwhichconfidenceintervalscanbeconstructedforthenearlyunitrootmodelwithoutknowingthevariance.Togainanintuitivesensefortheempiricallikelihoodratio,asmallsimulationfortheasymptoticdistributionisgiven.

  • 标签: GARCH 单位根 误差 估计 似然比统计量 极限分布
  • 简介:在这篇文章,我们为与批评的点在联合起来的polydiscDn定义的Blochmappings的一些各种各样的亚科建立失真定理,它扩大刘和Minda的结果到更高的尺寸。我们获得|det(f'(z))的更低的界限|并且为印射f的Bloch的det(f'(z))。作为应用,为holomorphicmappings的亚科的Bloch常数的一些更低、上面的界限被给。

  • 标签: 偏差定理 多圆柱 单位 映照 BLOCH常数 全纯映射
  • 简介:作者在加权的Bergman空间为Toeplitz产品的围住的海角给一些新必要条件联合起来的球的α2,在f和g在单位上是分析的的地方,成球形。Hankel产品HfH在联合起来的球的加权的Bergman空间的g*被学习,并且类似于那些Stroethoff和郑的结果在统一磁盘的设置获得了被证明。

  • 标签: 加权BERGMAN空间 TOEPLITZ 单位球 HANKEL 产品 胸腺细胞
  • 简介:一个试验性的平台被构造在转子旋转联合起来以内拍摄纤维运动,它基于类似理论一个透明转子和一条运输隧道主要是镇静的。纤维将在运输隧道拉长并且聚在一起进纤维捆。纤维的速度沿着入口正在增加到运输隧道的插头,并且纤维最大值速度出现在运输隧道的插头。纤维捆的笔直与运输隧道的集中度有关,并且集中度越大,纤维捆拉长越多straighter。结果将提供有用卓见给转子旋转的形成纱的机制。

  • 标签: 转杯纺纱机 纤维运动 实验平台 纺纱装置 运输通道 输送通道
  • 简介:Thenoveldicyanateesterresincontainingnaphthaleneunit(DNCY)wassynthesized,andcharacterizedbyFT-IR,^1H-NMR,^13C-NMRandelementalanalysis(EA),ThethermalpropertiesofDNCYresinwasstudiedbythermaldegradationanalysisataheatingrateof10℃/min^-1inN2andair,TheDNCYrdsinexhibitedbetterthermalandthrmal-oxidativestabilitythanbisphenolAdicyanate(BACY)resin.

  • 标签: 二氰酸酯树脂 合成 萘单体 热学性质
  • 简介:在这篇论文,我们给岩山iS~1(√(nr+2-n)的描述/(nr))×S~(n-1)(√(n-2)/(nr))S~m(√m/n)×S~(n-m)(√(n-m)/n)。我们的结果在M与二不同主要弯曲是在S~(n+1)的n维的完全的亢奋的表面的条件上由于李(1996)扩大结果。

  • 标签: 曲率 Gauss方程 刚性理论 超曲面
  • 简介:Theauthorshaveinventedtheuniqueoceanwavepowerstation,whichiscomposedofthefloatingtypeplatformwithapairofthefloatsliningupattheintervalofonewavepitchandthecounter-rotatingtypewavepowerunit,itsrunnersaresubmergedintheseawateratthemiddlepositionoftheplatform.Suchprofilesmaketheflowvelocityattherunneristwicefasterthanthatofthetraditionalfixed/caissontypeOWC,ontheidealflowconditions.Besides,therunnerscounter-rotatetheinnerandtheouterarmaturesofthepeculiargenerator,respectively,andtherelativerotationalspeedisalsotwicefasterthanthespeedofthesinglerunner/armature.Suchcharacteristicsmaketherunnerdiameterlarge,namelytheoutputhigher,asrequested,becausethetorqueofthepowerunitneveractonthefloatingtypeplatform.Atthepreliminaryreseach,thispaperverifiestogetthepowerusingaWellstypesinglerunnerinstalledinthemodelstation.Therunnertakestheoutputwhichisaffectedbytheoscillatingamplitudeoftheplatform,therotationalspeedandtheinertiaforceoftherunner,etc.

  • 标签: 发电站 浮动式 海洋波浪 水电机组 浮式平台 配备
  • 简介:WefindalowerboundfortheessentialnormofthedifferenceoftwocompositionoperatorsactingonH2(BN)orAs2(BN)(s>1).Thisresultplaysanimportantroleinprovinganecessaryandsufficientconditionforthedifferenceoflinearfractionalcompositionoperatorstobecompact,whichanswersaquestionposedbyMacCluerandWeirin2005.更多还原

  • 标签: 全纯函数空间 紧凑型 运营商 单位球 充分必要条件 复合算子
  • 简介:Anovelbiphenylside-chaineddiaminewithalkyloxyspacerandalkyloxytail,4'-butoxy-4-(3,5-diaminobenzoyloxy)hexyloxybiphenyl(C6BBC4),wassynthesizedandcharacterizedbyFTIRand1HNMR.Aseriesofpolyimide(PI)filmswithdifferentsidechaincontentswassynthesizedfrombiphenyltetracarboxylicdianhydride(BPDA),4,4'-oxydianiline(ODA)andC6BBC4,andtheirthermalproperties,opticaltransparencyandliquidcrystalalignmentproperty,andsoon,wereinvestigatedbythermogravimetricanalysis(TGA),differentialscanningcalorimetry(DSC),crystalrotationmethod,polarizingmicroscopyandUV-Visspectra.Withthecontentofsidechaineddiamineincreasingfrom0to100%,theηinhofpoly(amideacid)(PAA)decreasedrapidlyfrom3.0to0.51,theglasstransitiontemperature(Tg)ofpolyimides(PIs)decreasedfrom274℃to203℃andtheVis-lighttransmittanceofalignmentfilmssubstantiallyincreased.Asforthealignmentproperties,thepretiltangleofPIalignmentfilmswithoutrubbingcouldreach90°whenthecontentofC6BBC4was60%ormore.Atthesametime,thealignmentstabilitycouldmeettheindustrialrequirements.Itwasconsideredthatthealkoxyspacer,thebiphenylunitandthealkoxytailmayallplayimportantrolesinachievingalargepretiltangleevenupto90°,andtheintroductionofonlythealkoxyspaceroralkoxytailcanalsoimprovethepretiltangle,butnotbymuch.

  • 标签: 聚酰亚胺 热性能 侧链 联苯 合成 紫外可见光谱
  • 简介:Theauthorshadinventedtheuniquewindpowerunitcomposedofthelarge-sizedfrontwindrotor,thesmall-sizedrearwindrotorandthepeculiargeneratorwiththeinnerandtheouterrotationalarmatureswithouttheconventionalstator.Thisunitiscalled'IntelligentWindPowerUnit'bytheauthors.Thefrontandtherearwindrotorsdrivetheinnerandtheouterarmatures,respectively,whiletherotationaltorqueiscounter-balancedbetweenbotharmatures/windrotors.Thispaperdiscussesexperimentallytheacousticnoisefromthefrontandtherearwindrotors.Theacousticnoise,inthecounter-rotatingoperation,isinducedmainlyfromtheflowinteractionbetweenbothrotors,andhasthedominantpowerspectrumdensityatthefrequencyofthebladepassinginteraction.Thenoiseiscausedmainlyfromtheturbulentfluctuationduetotheflowseparationontheblade,whentherearwindrotorstopsorrotatesinthesamedirectionasthefrontwindrotor.

  • 标签: 风电机组 外转子 智能型 风噪声 声学 串联
  • 简介:ThisarticleprovestheexistenceofJuliadirectionsofvaluedistributionofholomorphicmappingffromtheunitdiskintothen-dimensionalcomplexprojectivespacePn(C)undertheassumptionlimsupr→1-T(r,f)/log1/1-r=+∞forhypersurfacesingeneralposition.AheuristicprincipleconcerningtheexistenceofJuliadirectionsofholomorphicmappingsfromtheunitdiskintoPn(C)isgivenalso.

  • 标签: 全纯映射 单位圆盘 奇异方向 JULIA方向 作者 启发式