简介：

简介：Thereisagrowingsupportforthelowlyingscalarmesonsf0(500),f0(980),a0(980),and(800)tobegenerateddynamicallyfromtheinteractionofpseudoscalarmesons,whilethecaseofthenextsetofscalarresonancesathigherenergies,f0(1370),f0(1710),K0(1430)ismoreaquestionofdebate.Soisthecaseofthetensorresonancesf2(1270),f′2(1525),K2(1430).AnewperspectiveonthesestateshasbeenofferedinRef.[1]wherethef0(1370)andf2(1270)resonancesareshowntobegeneratedfromtheinteractionprovidedbythelocalhiddengaugeLagrangiansimplementingunitarization.Itisshownthattheideaofthenatureofthesestatesasvectormeson-vectormesoncompositestateshasbeentestedinmanyreactions.Yet,thepermanentdiscussionoftheissuedemandsextrachecksforotherobservablesand,inthissense,theweakdecaysbringanewsourceofvaluableinformationthatshouldservetotestdifferentmodels.

简介：

简介：Intheframeworkofgameswithcoalitionstructure,weintroduceprobabilisticOwenvaluewhichisanextensionoftheOwenvalueandprobabilisticShapleyvaluebyconsideringthesituationthatnotallprioriunionsareabletocooperatewithothers.Thenweusefiveaxiomsofprobabilisticefficiency,symmetricwithincoalitions,symmetricacrosscoalitionsapplyingtounanimitygames,strongmonotonepropertyandlinearitytoaxiomatizethevalue.

简介：Inthispaper,anunderwaterstructureismodeledasacylindricalshellwithinternalbulkheads,andclosedbyatruncatedconicalshell,anditconsistsofmetalsubstrateandsoundabsorbingcoating,whoseFGMcoreisconsidered.Supposetheinnercavityandouterspaceofthestructurearefilledwithairandfluidmediums,themechanicalresponseoftheunderwaterstructureiscalculatedwithGalerkinmethodwhiletheacousticresponseisinvestigatedbymeansoftheHelmholtzintegral.Somenumericalexamplesaregivenandtheeffectofgeometricalsizeandmaterialparametersonmechanicalandacousticresponseisdiscussed.

简介：

简介：Mechanicalcharacterizationofsteelframestructureafterfireareanalyzedbasedonfiredynamics,heattransfertheory,structuralmechanics,andfiniteelementtheory.Westudythetemperaturecharacteristicsandmechanicalpropertiesofsteelframestructureunderdifferentfirelocationsandproposeasafetyevaluationmethod.Wealsoanalyzedamagelevelofmainframecomponents,maximumtemperatureoffire,thermalcharacteristicsofframecomponents,firingduration,etc.toprovideusefulinformationforfireresistancedesignofthesteelframestructureandpost-disastersafetyevaluation.

简介：(连续)为电子结构的答案的计算的不同订单的有限元素近似在一些报纸被建议，这些途径的表演正在变得可估计并且现在很好被理解。在这份出版物，作者建议由联合有限元素网孔的精炼为完整潜力的电子结构计算扩大这discretization，在溶液随溶液主要是常规的区域的多项式近似的度的增加是很单个的的地方。近似性质的增加的这联合，做在一priori或一种posteriori方式，甚至当答案是单个的时，是著名的通常关于自由的度的数字生产最佳的指数的类型集中率。这里执行的分析在Hartree-Fock和Kohn假冒的问题的情况中支撑这个性质。

简介：Theplasticdeformationsoftemperedmartensitesteelrepresentativevolumeelementswithdifferentmartensiteblockstructureshavebeeninvestigatedbyusinganonlocalcrystalplasticitymodelwhichconsidersisotropicandkinematichardeningproducedbyplasticstraingradients.Itwasfoundthatpronouncedstraingradientsoccurinthegrainboundaryregionevenunderhomogeneousloading.Theisotropichardeningofstraingradientsstronglyinfluencestheglobalstress–straindiagramwhilethekinematichardeningofstraingradientsinfluencesthelocaldeformationbehaviour.Itisfoundthattheadditionalstraingradienthardeningisnotonlydependentontheblockwidthbutalsoonthemisorientationsorthedeformationincompatibilitiesinadjacentblocks.

简介：思维导图是以发散性思考为基础并以图文表征的一种思维工具,它能促进人们对已有的知识与经验进行相关性的联想并通过图示与关键词的形式来反映知识间的联系或层级关系,因此它在促进学生对知识的理解与记忆以及构建立体化知识与方法体系从而提高学习效率有着独特的功效.思维导图在物理复习教学中的应用主要体现在转变再认方式、贯通理解知识、引导知识梳理、探究题型方法这四个方面.

简介：AmodelofcrosslinkerunbindingisimplementedinahighlycoarsegrainedgranularmodelofF-actincytoskeleton.WeemploythisspecificgranularmodeltostudythemechanismsofthecompressiveresponsesofF-actinnetworks.ItisfoundthatthecompressiveresponseofF-actincytoskeletonhasdependencyonthestrainrate.TheevolutionofdeformationenergyinthenetworkindicatesthatcrosslinkerunbindingeventscaninducetheremodellingofF-actincytoskeletoninresponsetoexternalloadings.TheinternalstressinF-actincytoskeletoncanefficientlydissipatewiththehelpofcrosslinkerunbinding,whichcouldleadtothespontaneousrelaxationoflivingcells.

简介：

简介：Dopingeffectsofmanganese(Mn)oncatalyticperformanceandstructureevolutionofNiMgOcatalystsforsynthesisofmulti-walledcarbonnanotubes(MWCNTs)frommethanewereinvestigatedforthefirsttime.AdditionofMninNiMgOcatalystcangreatlyimprovetheMWCNTsyield.Mn0.2NiMgOcatalystamongthetestedonesgivesthehighestMWCNTsyieldas2244%,whichistwotimeshigherthanthatofthecatalystwithoutMn.Thestructureevolution,reductionbehaviorsandsurfacechemicalpropertiesofMnNiMgOcatalystswithvariousMncontentswerestudiedindetail.ItwasfoundthatthestablesolidsolutionofNiMgO2formedinNiMgOcatalystwasdisturbedbytheadditionofMn.Instead,anothersolidsolutionofMnMg6O8isformed.MoreamountofNicanbereducedanddispersedonthecatalystsurfacetobeactedasactivesites.Importantly,thechangesofNicontentonthesurfacearecorrelatedwiththeNiparticlesizeandtheouterdiameterofMWCNTs,suggestingthecontrollablesynthesisofMWCNTsoverMnNiMgOcatalysts.

简介：介绍了＂强光一号＂Z箍缩激光探针光路的设计及搭建、激光器光源品质优化、激光器触发系统设计及与加速器同步调试等,并利用初步建立的激光探针对平面型W丝阵和Al丝阵Z箍缩过程进行了诊断。结果表明：激光探针能够反映出Z箍缩各阶段的典型特征,包括熔蚀不均匀性、亚毫米级准周期调制结构、内爆过程不稳定性、滞止阶段拖尾等。指出了现有激光探针系统需要改进的环节,包括激光器触发、探针图像记录、条纹数据定量分析等。

简介：

简介：目前储量的分类标准是通过划分指标值的范围来确定的,这就要求所有指标值恰好符合既定的指标范围,否则难以划分储量类别。为克服这一问题,本文结合模糊c-均值算法和组合赋权法实现难采储量的分类。首先基于效益指标运用模糊c-均值算法自动搜索储量的最佳类别,再利用主客观赋权偏差最小的思想,构建组合赋权模型,确定属性指标的权重,并计算储量效益指标值,结合模糊c-均值结果判别难采储量类别。最后以大庆某油田为实例,对其难采储量进行了分类,有效指导难采储量滚动开发决策。

简介：InthispaperweestablishsharpH¨olderestimatesofharmonicfunctionsonaclassofconnectedpostcriticallyfinite(p.c.f.)self-similarsets,andshowthatfunctionsinthedomainofLaplacianenjoythesameproperty.Somewell-knownexamples,suchastheSierpinskigasket,theunitinterval,thelevel3Sierpinskigasket,thehexagasket,the3-dimensionalSierpinskigasket,andtheVicseksetarealsoconsidered.

简介：采用密度泛函B3LYP/6-311G（d,p）方法对CH3F与C2H3的反应体系进行了理论研究,获得了反应的势能面信息及可能的微观机理.在QCISD（T）/6-311＋＋G（d,p）水平上精确计算了各反应物种的单点能.结果表明,除抽提氢反应外,标题反应还存在抽提氟（R1）、消氟化氢（R2）、消氢（R3）和自由基形成（R4）四类反应.在QCISD（T）/6-311＋＋G（d,p）//B3LYP/6-311G（d,p）水平上,R1,R2,R3和R4反应的能垒分别是163.9,152.2,209.8和224.2kJ·mol-1,相应反应能为-56.6,-164.3,-2.7和-156.0kJ·mol-1,所有反应均放热,为热力学允许的反应.

简介：Inthepresentwork,aninterconnectedsandwichcarbon/Si-SiO2/carbonnanospherescompositewaspreparedbytemplatemethodandcarbonthermalvapordeposition（TVD）.ThecarbonconductivelayercannotonlyefficientlyimprovetheelectronicconductivityofSi-basedanode,butalsoplayakeyroleinalleviatingthenegativeeffectfromhugevolumeexpansionoverdischarge/chargeofSi-basedanode.Theresultingmaterialdeliveredareversiblecapacityof1094mAh/g,andexhibitedexcellentcyclingstability.Itkeptareversiblecapacityof1050mAh/gover200cycleswithacapacityretentionof96%.

简介：针对采用经典划分思想的聚类算法以一个点来代表类的局限，提出一种基于泛化中心的分类属性数据聚类算法。该算法通过定义包含多个点的泛化中心来代表类，能够体现出类的数据分布特征，并进一步提出泛化中心距离及类间距离度量的新方法，给出泛化中心的确定方法及基于泛化中心进行对象到类分配的聚类策略，一般只需一次划分迭代就能得到最终聚类结果。将泛化中心算法应用到四个基准数据集，并与著名的划分聚类算法K-modes及其两种改进算法进行比较，结果表明泛化中心算法聚类正确率更高，迭代次数更少，是有效可行的。