简介：Inthepaper,anexperimentinvestigationwasconductedforone-andtwo-degreeoffreedomvortex-inducedvibration（VIV）ofahorizontally-orientedcylinderwithdiameterof11cmandlengthof120cm.Intheexperiment,thespringconstantsinthecross-flowandin-lineflowdirectionswereregulatedtochangethenaturalvibrationfrequencyofthemodelsystem.Itwasfoundthat,intheone-degreeoffreedomVIVexperiment,a＂doublepeak＂phenomenonwasobservedinitsamplitudewithintherangeofthereducedvelocitiestested,moreover,a＂2T＂wakeappearedinthevicinityofthesecondpeak.Inthetwo-degreeoffreedomVIVexperiment,thetrajectoryofcylinderexhibitedareverse＂C＂shape,i.e.,a＂newmoon＂shape.Throughanalysisofthesedata,itappearsthat,besidesthenon-dimensionalin-lineandcross-flownaturalvibrationfrequencyratios,theabsolutevalueofthenaturalvibrationfrequencyofcylinderisalsooneoftheimportantparametersaffectingitsVIVbehavior.

简介：AsetDofverticesofagraphG=(V,E)iscalledadominatingsetifeveryvertexofVnotinDisadjacenttoavertexofD.In1996,Reedprovedthateverygraphofordernwithminimumdegreeatleast3hasadominatingsetofcardinalityatmost3n/8.InthispaperwegeneralizeReed'sresult.WeshowthateverygraphGofordernwithminimumdegreeatleast2hasadominatingsetofcardinalityatmost(3n+|V_2|)/8,whereV_2denotesthesetofverticesofdegree2inG.Asanapplicationoftheaboveresult,weshowthatfork>1,thek-restricteddominationnumberr_k(G,y)<(3n+5k)/8forallgraphsofordernwithminimumdegreeatleast3.

简介：AnalgorithmforsimultaneouscomputationoftheadjointG(s)anddeterminantd(s)ofthematrixpolynomials2JsA1-A2ispresented,whereJisasingularmatrix.BothG(s)andd(s)areexpressedrelativetoabasisofLaguerreorthogonalpolynomials,ThisalgorithmisanewextensionofLeverrier-Fadeevalgorithm.

简介：在这研究，一条新分析途径被开发分析保守two-degree-of-freedom(TDOF)的免费非线性的颤动系统。这些系统的数学模型被秒顺序管理非线性的部分微分方程。非线性的微分方程被使用一些中间的变量变成一个单个方程。单个非线性的微分方程被使用Hamiltonian途径的第一份订单解决(哈)。不同参数，在系统的反应上有重要影响，被考虑并且讨论。一些比较被介绍验证在Hamiltonian途径和准确答案之间的结果。最大的相对错误是为颤动的大振幅的不到2.2124%。Hamiltonian途径的第一次重复完成很精确的结果，这被建立了，不要求任何小不安，并且能被用于大量非线性的问题。

简介：Thedynamicbehaviorofatwo-degree-of-freedomobliqueimpactsystemconsistedoftwopendulumswithnon-fixedimpactpositionsisinvestigated.Therelationsbetweentherestitutioncoefficient,thefrictioncoefficient,aswellasotherparametersofthesystemandthestatesbeforeorafterimpact,areclarifiedinthisobliqueimpactprocess.Theexistencecriterionofsingleimpactperiodic-nsubharmonicmotionsisdeducedbasedonthePoincaremapmethodandtheobliqueimpactrelationswithnon-fixedimpactpositions.ThestabilityofthesesubharmonicperiodicmotionsisanalyzedbytheFloquettheory,andtheformulastocalculatetheFloquetmultipliersaregiven.Thevalidityofthismethodisshownthroughnumericalsimulation.Atthesametime,theprobabilitydistributionofimpactpositionsinthisobliquesystemwithnonfixedimpactpositionsisanalyzed.

简介：

简介：Denotebyn（f）thedegreeofcopositiveapproximationtof（x）bypolynomialsofdegree≤n.Forfunctionf（x）∈Ck[-1,1]whichalternatesinsignfinitelymanytimesin[-1,1],theauthorobtainsthefollowingJacksontypeestimatesn（f）≤Cn-kw(fk,1/n)foaanypositiveintegerk.

简介：

简介：AgraphGisκ-orderedHamiltonian2≤κ≤n,ifforeveryorderedsequenceSofκdistinctverticesofG,thereexistsaHamiltoniancyclethatencountersSinthegivenorder,Inthisarticle,weprovethatifGisagraphonnverticeswithdegreesumofnonadjacentverticesatleastn+3κ-9/2,thenGisκ-orderedHamiltonianforκ=3,4,…，[n/19].Wealsoshowthatthedegreesumboundcanbereducedton+2[κ/2]-2ifκ(G）≥3κ-1/2orδ（G）≥5κ-4.Severalknownresultsaregeneralized.

简介：BasedontheX-rayscatteringintensitytheory,thecorrectionfactorsofthedegreeofcrystallinityformulaeofthemulticomponentpolymershavebeenclearlydefined.TheformulaeofthedegreeofcrystallinityofthemulticomponentpolymerswerederivedintermsofWAXDtheoryandimprovedgraphicmultipeakresolutionmethods.Theresultscalculatedaresatisfactoryincomparisonwiththedensitymeasurement.

简介：Abstract.Inthispaper,weintroduceanewapproachtocharacterizetheisomor-phismsofcirculantdigraphs.Intermsofthismethod,wecompletelydeterminetheisomorphicclassesofcirculantdigraphsofdegree3.Inpsrticular,wecharacterizethosecirculantdigraphsofdegree3whichdon''tsatisfyJkdAm''sconjectttre.

简介：动物们两个两个在一起。好哇!好哇!动物们两个两个在一起。六象和袋鼠，他们两个为了避雨都逃进了方舟。

简介：让n和k(n≥k>1)是二个非否定的整数。n顶点上的k-multi-hypertournament是对(V，一)，在V是有|V的一套顶点的地方|=n，和A是顶点的一套k元组，为V的任何k子集S叫了弧，A包含至少一个(至多k!)k！其条目属于S的k元组。为是某k-multi-hypertournament的外面度顺序(在里面度顺序)的非否定的整数的一个不减少的序列的必要、足够的条件被给。

简介：ThispaperstudyupthecontributiondegreeanddevelopmentpoliciesofservicetradetoBeijingeconomybymacroeconomicmodelingmethod.TheresultshowscontributiondegreeofservicetradetoBeijingeconomyis2.419.

简介：

简介：

简介：在这个工作，我们以它的最小的度和它的顺序为任何图的直径获得好上面的界限，改进由于Erd的一条古典定理?s，Pach，绿鳕和Tuza。我们使用这些界限以便学习夸张的图(在Gromov意义)。计算hyperbolicity常数是一个几乎难处理的问题，这样试着以图的一些参数围住它是自然的。让H(n，0)是有n顶点和最小的度0,和J的图G的集合(n，)是有n顶点和最大的度的图G的集合。我们在图上学习四个后面的extremal问题：一(n，0)=min{(G)|GH(n，0)},b(n，0)=最大{(G)|GH(n，0)},(n，)=min{(G)|GJ(n，)}并且(n，)=最大{(G)|GJ(n,)}。特别地，我们为b获得界限(n，0)和我们计算精确价值一(n，0),(n，，并且()，并且(n，)为n的所有价值，0并且分别地。

简介：

简介：XinhuaNewsAgency,Beijing,March25OnMarch25,MinistryofEducationissuedNoticeoftheStateCouncilDegreeCommitteeonSpecialEvaluationResultofDegreeConferralInstitutionsandRelevantHandlingOpinionsin2014.TheNoticestipulates

简介：Wemeasuretheelectromagneticdegreeoftemporalcoherenceandtheassociatedcoherencetimeforquasi-monochromaticunpolarizedlightbeamsemittedbyanLED,afilteredhalogenlamp,andamultimodeHe–Nelaser.ThemethodisbasedonobservingattheoutputofaMichelsoninterferometerthevisibilities(contrasts)oftheintensityandpolarization-statemodulationsexpressedintermsoftheStokesparameters.Theresultsareingoodagreementwiththosededuceddirectlyfromthesourcespectra.Themeasurementsarerepeatedafterpassingthebeamsthroughalinearpolarizersoastoelucidatetheroleofpolarizationinelectromagneticcoherence.Whilethepolarizervariestheequal-timedegreeofcoherenceconsistentlywiththetheoreticalpredictionsandalterstheinnerstructureofthecoherencematrix,thecoherencetimeremainsalmostunchangedwhenthelightvariesfromunpolarizedtopolarized.Theresultsareimportantintheareasofapplicationsdealingwithphysicalopticsandelectromagneticinterference.