简介：本文把点集拓扑学中的C·T·Yang定理推广到模糊拓扑学中，并且获得了一些其它新的结果。

简介：￣１ＨＡＮＤ￣（１３）ＣＮＭＲＳＴＵＤＹＯＦＩＮＣＬＵＳＩＯＮＣＯＭＰＬＥＸＡＴＩＯＮＯＦＤＳＳＷＩＴＨβ－ＣＹＣＬＯＤＥＸＴＲＩＮ￥ＱｉｎｇＸｉａｎｇＧＵＯ；ＴａｎＲＥＮ；ＺｉＺｈｏｎｇＬＩａｎｄＹｏｕＣｈｅｎｇＬＩＵ（ＮａｔｉｏｎａｌＬａｂｏｒａ...

简介：FournewtaxanediterpenoidswereisolatedfromthebarkofTaxusyunnanensis.Theirstructureswereelucidatedasthenewskeletonwith5/7/6/4memberedringsbyspectralanalysisand2DNMRshiftcorrelationexperiments.

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简介：本文讨论了co空间上生灭矩阵生成Co-半群的条件,并证明了该生成的半群是一正的压缩半群.

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简介：利用拟生灭过程和矩阵几何解的方法研究了只允许部分服务台异步单重休假的M/M/c排队系统,给出了系统的稳态指标的计算方法和条件随机分解结果,最后指出一些较简单的排队模型是本文的特例.

简介：Inthispaperwedescribeamulti-gridalgorithmformixedproblemswithpenaltybythelinearfiniteelementapproximation.Itisprovedthattheconvergencerateofthealgorithmisboundedawayfrom1independentlyofthemeshsize.Forconvenience,weonlydiscussJacobirelaxationassmoothingoperatorindetail.

简介：ErdǒsandSósconjecturedin1963(see[1],Problem12in247)thateverygraphGonnverticeswithsizee(G)>1/2n(κ-1)containseverytreeTofsizek.Inthispaper,weprovetheconjectureforgraphswhosecomplementscontainnocyclesoflength4.

简介：TheauthorsprovetheHyers-Ulam-RassiasstabilityofthequadraticmappinginBanachmodulesoveraunitalC*-algebra,andprovetheHyers-Ulam-RassiasstabilityofthequadraticmappinginBanachmodulesoveraunitalBanachalgebra.

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简介：HilbertC*-模上框架的框架变换的实质是将该模进行膨胀,使得该框架变换的值域存在标准正交基,以便于HilbertC*-模上不同框架之间关系的研究.受此启发,本文引入了HilbertC*-模上框架(强)可补的概念,给出并证明了HilbertC*-模上有限个框架(强)可补的充要条件.

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简介：Theabinitiomolecularorbitalmethodisemployedtostudytheenantioselectivereductionofacetophenonewithboranecatalyzedbythiszolidino[3,4-c]oxazaborolidine.Computationresultshowsthatthecontrollingstepforthereductionisthedecompositionofthecatalyst-alkoxyboraneadductandthereductionleadstoS-alcohols.ThetransitionatateofthehydridetransferfromtheboranemoietytothecarbonylcarbonofacetophenoneisatwistedchairstructurewithaB(2)-N(3)-BBH3-HBH3-CCo-OCO6-memberedring.

简介：本文得到了C＊-代数值度量空间中的一些不动点定理,其结果改进并推广了马振华等人发表在2014年《不动点理论及其应用》一文中的工作.而且,运用所得到的结果,获得了一类常见积分方程解的存在性和唯一性定理.

简介：LetM^nbeaclosedspacelikesubmanifoldisometricallyimmersedindeSitterspaceSp^(n+p)(c)，DenotebyR,HandSthenormalizedscalarcurvature,themeancurvatureandthesquareofthelengthofthesecondfundamentalformofM^n,respectively.SupposeRisconstantandR≤c.ThepinchingproblemonSisstudiedandarigiditytheoremforM^nimmersedinSp^(n+p)(c)withparallelnormalizedmeancurvaturevectorfieldisproved.Whenn≥3,thepinchingconstantisthebest.Thus,themistakeofthepaper“Space-likehypersurfacesindeSitterspacewithconstantscalarcurvature”(seeManusMath,1998,95:499-505)iscorrected.Moreover,thereductionofthecodimensionwhenM^nisacompletesubmanifoldinSp^(n+p)(c)withparallelnormalizedmeancurvaturevectorfieldisinvestigated.

简介：ThevibrationalRamanspectrahavebeenobtainedforpurifiedsolidfilmsC60.Threebandswereobservedoutofthetotalof10thatweretheoreticallypredicted.Somephenomenawhichmaybeduetophoton-inducedoxidationinthevibrationalRamanmeasuringwereobserved.