简介：BasedonexactGreenstrainofspatialcurvedbeam,thenonlinearstrain-displacementrelationforplanecurvedbeamwithvaryingcurvatureisderived.Insteadofusingthepreviousstraightbeamelements,curvedbeamelementsareusedtoapproximatethecurvedbeamwithvaryingcurvature.Basedonvirtualworkprinciple,rigid-flexiblecouplingdynamicequationsareobtained.Physicalexperimentswerecarriedouttocapturethelargeoverallmotionandthestrainofcurvedbeamtoverifythepresentrigid-flexiblecouplingformulationforcurvedbeambasedoncurvedbeamelement.Numericalresultsobtainedfromsimulationswerecomparedwiththoseresultsfromthephysicalexperiments.Inordertoillustratetheeffectivenessofthecurvedbeamelementmethodology,thesimulationresultsofpresentcurvedbeamelementsarecomparedwiththoseobtainedbypreviousstraightbeamelements.Thedynamicbehaviorofaslider-crankmechanismwithaninitiallycurvedelasticconnectingrodisinvestigated.Theadvantageofemployinggeneralized-αmethodispointedoutandthespecialnonlineardynamiccharacteristicsofthecurvedbeamareconcluded.

简介：Bymeansofreasonableassumptionandmathematicalderivation,atheoreticexpressionofflowrateforasinglefracturewithlinearlyvaryingwidthwasobtained.Themathematicalderivationwasbasedonthecubiclawandthenewtheoreticexpressionwasanextentionoftraditionalparallelplatemodel.Thisstudymayhelptoanalyzeseepageinfracturedrockmass.

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简介：TheMelnikovmethodwasextendedtoperturbedplanarnon-Hamiltonianintegrablesystemswithslowly-varyingangleparameters.Basedontheanalysisofthegeometricstructureofunperturbedsystems,theconditionoftransverselyhomoclinicintersectionwasestablished.ThegeneralizedMelnikovfunctionoftheperturbedsystemwaspresentedbyapplyingthetheoremonthedifferentiabilityofordinarydifferentialequationsolutionswithrespecttoparameters.ChaosmayoccurinthesystemifthegeneralizedMelnikovfunctionhassimplezeros.

简介：Optimalcontrolsystemofstatespaceisaconservativesystem,whoseapproximatemethodshouldbesymplecticconservation.Basedonthepreciseintegrationmethod,analgorithmofsymplecticconservativeperturbationispresented.Itgivesauniformwaytosolvethelinearquadraticcontrol(LQcontrol)problemsforlineartime-varyingsystemsaccuratelyandefficiently,whosekeypointsaresolutionsofdifferentialRiccatiequation(DRE)withvariablecoefficientsandthestatefeedbackequation.Themethodissymplecticconservativeandhasagoodnumericalstabilityandhighprecision.Numericalexamplesdemonstratetheeffectivenessoftheproposedmethod.

简介：ThispaperinvestigatestherobuststochasticstabilityandH∞analysisforstochasticsystemswithtime-varyingdelayandMarkovianjump.Byusingthefreeweightingmatrixtechnique,i.e.,He’stechnique,andastochasticLyapunov-Krasovskiifunctional,newdelay-dependentcriteriaintermsoflinearmatrixinequalitiesarederivedforthetherobuststochasticstabilityandtheH∞disturbanceattenuation.Threenumericalexamplesaregiven.Theresultsshowthattheproposedmethodisefficientandmuchlessconservativethantheexistingresultsintheliterature.更多还原

简介：这份报纸处理一二维(2D)为厚板有热采购的transverselyisotropic和身体的问题强迫。板的上面的表面是与规定表面温度免费的应力，当板的更低的表面在一个僵硬基础上休息时并且热地被绝缘。学习在格林和Naghdi建议的概括thermoelasticity的上下文被执行。为排水量和温度领域的管理方程被使用Laplace和Fourier变换在Laplace-Fourier变换领域获得。双变换的倒置数字地被做。Laplace变换的数字倒置基于Fourier系列扩大被做。数字计算为镁(Mg)被执行，并且结果图形地被介绍。各向同性的材料(Cu)的结果数字地被获得并且图形地介绍了与横着各向同性的材料(Mg)的那些相比。身体力量的效果也被学习。

简介：Basicmagnesiumcarbonatemicrosphereswitharedbloodcell（RBC）-likeappearanceanddiametersof3μmweresynthesizedbyamphiphilicmolecule-participatedself-assemblyunderhydrothermalconditions.Intheself-assembly,sodiumdodecylbenzenesulfonateservedasatemplatefortheformationofMg（OH）2sphericalmicellesandalsoasareactantprecursorthatreleasesCO2toreactwithMg（OH）2.Thegrowthofthemicrospheresisdrivenbythecontinuousgenerationofnewhydrophobiccentersbecauseoftheconsumptionofhydrophilicpoles（—SO3-）.Thesurfactant-directedself-assemblycanbeappliedtothesynthesisofothercarbonateormetallicoxideself-assemblies,indicatingthatitisauniversalself-assemblymethodforamphiphilicmolecules.