简介:translationitselfisaculture,Thelanguageisacountryculturecarrier,thetranslationofafilmlikefillingaword
简介:Thisresearchaimstoimprovetheforecastingprecisionofelectricquantity.ItisdiscoveredthatthetotalelectricityconsumptionconsiderablyincreasedduringtheSpringFestivalbytheanalysisoftheelectricquantitytimeseriesfrom2002to2007inShandongprovince.Thefestivalfactorisascertainedtobeoneoftheimportantseasonalfactorsaffectingtheelectricquantityfluctuations,andthemultiplicationmodelforforecastingisimprovedbyintroducingcorrespondingvariablesandparameters...
简介:运用概率型算子的概率性质,研究了局部有界函数厂的Integral型Lupas—Bêzier算子收敛阶,得到更精确的估计。其研究对于Bêzier型算子逼近的研究工作,以及提高运用Bêzier法的计算机辅助设计几何造型的精度的估计有重要意义。
简介:Inthispaper,theproblemofParameterestimationinlineardelayedsystemsfromsampleddataistreated.Usingnumericalintegraloperation(NIO),anidentificationmodelwhichisparametrizeddirectlyinthelineardelayedsystempa-rametersisgot.Withtheleastsquare(LS)methodortheinstrumentalvariable(Ⅳ)method,therecursivealgorithmofparameterestimationisgiven.Theresultoftheillustratedexampleshowsthatthisalgorithmissimple,rapidandaccurrate.
简介:Asecond-ordermixingdifferenceschemewithalimitingfactorisdeducedwiththereconstructiongradientmethodandappliedtodiscretizingtheNavier-Stokesequationinanunstructuredgrid.Thetransformofnonorthogonaldiffusionitemsgeneratedbytheschemeindiscreteequationsisprovided.TheDelaunaytriangulationmethodisimprovedtogeneratetheunstructuredgrid.ThecomputingprogrambasedontheSIMPLEalgorithminanunstructuredgridiscompiledandusedtosolvethediscreteequationsoftwotypesofincompressibleviscousflow.Thenumericalsimulationresultsofthelaminarflowdrivenbylidincavityandflowbehindacylinderarecomparedwiththetheoreticalsolutionandexperimentaldatarespectively.Intheformercase,agoodagreementisachievedinthemainvelocityanddragcoefficientcurve.Inthelattercase,thenumericalstructureanddevelopmentofvortexunderseveralReynoldsnumbersmatchwellwiththatoftheexperiment.Itisindicatedthatthefactordifferenceschemeisofhigheraccuracy,andfeasibletobeappliedtoNavier-Stokesequation.
简介:Thestressintensityfactor(SIF)isacriticalparameterassociatedwiththefracturebehaviourofmaterials.Inthispaper,weselectthedisplacementfunctionaroundacracktipastheshapefunctionofthedigitalimagecorrelation(DIC),whichmakesitpossibletodirectlycalculatetheSIFbythecorrelationscheme.Moreover,weuseanon-rectangularsubset,whichcanreducetheinfluenceofplasticdeformationandcrackwidthontheDICmeasurementaccuracy.WemeasuredtheSIFofamodeIcrackinasuper-hardaluminiumalloyspecimentoverifytheperformanceoftheproposedmethod.OurexperimentalresultsshowthataDICwithaspecificshapefunctioncanbeusedtoaccuratelyandefficientlycalculatetheSIF.Furthermore,wealsopresentapracticalapplicationofourproposedmethodfordeterminingtheSIF,crackpropagationangleandcracktipdisplacement.
简介:Theliteratureshowsthatimprovementsincognitiveperformancemaybeobservedfollowinganacuteboutofexercise.However,evidenceinsupportofthebiologicalmechanismsofthiseffectisstilllimited.Findingsfrombothrodentandhumanstudiessuggestbrain-derivedneurotrophicfactor(BDNF)asapotentialmechanismoftheeffectofacuteexerciseonmemory.ThemolecularpropertiesofBDNFallowthisproteintobeassessedintheperiphery(pBDNF)(i.e.,bloodserum,bloodplasma),makingmeasurementsofacuteexercise-inducedchangesinBDNFconcentrationrelativelyaccessible.StudiesexploringtheacuteexerciseepBDNFecognitiveperformancerelationshiphavehadmixedfindings,butthismaybemorereflectiveofmethodologicaldifferencesbetweenstudiesthanitisastatementabouttheroleofBDNF.Forexample,significantassociationshavebeenobservedbetweenacuteexercise-inducedchangesinpBDNFconcentrationandcognitiveperformanceinstudiesassessingmemory,andnon-significantassociationshavebeenfoundinstudiesassessingnon-memorycognitivedomains.ThreesuggestionsaremadeforfutureresearchaimedatunderstandingtheroleofBDNFasabiologicalmechanismofthisrelationship:1)Assessmentsofcognitiveperformancemaybenefitfromafocusonvarioustypesofmemory(e.g.,relational,spatial,long-term);2)MorefinegrainedmeasurementsofpBDNFwillallowfortheassessmentofconcentrationsofspecificisoformsoftheBDNFprotein(i.e.,immature,mature);3)StatisticaltechniquesdesignedtotestthemediatingroleofpBDNFintheacuteexercise-cognitiveperformancerelationshipshouldbeutilizedinordertomakecausalinferences.
简介:运动评价髌(VISA-P)规模的BackgroundThe维多利亚式的研究所是过去常与膝盖骨的tendinopathy在运动员估计症状严厉的最条件特定的报导病人的结果措施。以前的探索因素分析被进行了评估规模维数,与不一致的结果,并且规模的因素结构仍然保持不清楚。现在的学习的目的是越过包括的sexes.MethodsThe学习用确定的因素分析(CFA)和测试测量不变性决定VISA-P规模的因素的结构有膝盖骨的tendinopathy的249个西班牙的运动员的一件便利样品。CFA被执行估计因素的有效性。假设1因素和2因素模型被测试。越过性的测量不变性用EQS6.1software.ResultsThe与几个合适的索引经由多组CFA被评估内部一致性系数0.74。几个CFA模特儿被检查,在为项目的错误,7和8被相关的1因素模型出现了可接受装入比较合适的索引(CFI)和goodness-of-fit索引(GFI)的术语统计(CFI=0.93;GFI=0.94;标准化根平均数平方residual=0.06;approximation=0.10的根均方差;90%信心间隔:0.08-0.13)。这个模型越过在为项目的错误,7和8被相关的VISA-P规模(VISA-P-Sp)的西班牙的版本的1因素模型表明了的sexes.ConclusionThe是不变的亲戚装入CFA。没有性偏爱,经由VISA-P-Sp获得的分数能在男人和女人之间被比较。进一步的研究应该并发地检验VISA-P规模和另外的单个分数的报导病人的结果措施。
简介:在有的大学物理教材中把功的计算式。W=integralfromn=AtoB(d■)中d■的物理意义解释为物体的位移(下称第一种解释),而有的教材中解释为力的作用点的位移(以下称第二种解释)。那么,这两种解释之间究竟存在着怎样的联系与区别呢?通过以下几个问题的分析,我们便可找到答案。一、物体平动时功的计算我们知道,物体平动时,各点的运动情况完全一样。而物体所受力的作用点肯定在物体上(或等效作用于)某一点,因此,物体的位移与物体所受力的作用点的位移是相等的。此时,以上对d■的两种解释是等效的。也就是说,当物体平动时,公式W=integralfromn=AtoB(d■)既可以理解为物体的位移,也可以理解为物体所受力的作用点的位移。
简介:BackgroundIntensive锻练为葡萄糖和为它的新陈代谢反应负责的几条生物化学的小径改变生理的需要。在他们之中是包含胰岛素,像胰岛素的生长因素(IGF-1),和IGF有约束力的蛋白质(IGFBP)的那些。锻练的不同类型和度,以及运动员健康,可以关于为改变需要的集中和时间导致回答的一个范围。工作的想法是发现是否并且insulin/IGF轴怎么在已经训练的题目对另外的物理活动作出回应并且如果那么,是从在校园里的4星期的集中的训练的新陈代谢的control.MethodsThe效果的方面潜在地有益的改编(准备训练)胰岛素的onthelevels,在最大的进步锻练期间,一辆踏车上的测试(MPET)与在MPET期间获得的结果相比的IGF-1,和IGFBP在一个常规训练季节以后进行了17戠慩s