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500 个结果
  • 简介:ThepaperconsiderstheKrylov-LanczosandtheEckhoffapproximationsforrecoveringabivariatefunctionusinglimitednumberofitsFouriercoefficients.Theseapproximationsarebasedoncertaincorrectionsassociatedwithjumpsinthepartialderivativesoftheapproximatedfunction.ApproximationoftheexactjumpsisaccomplishedbysolutionofsystemsoflinearequationsalongtheideaofEckhoff.AsymptoticbehaviorsoftheapproximatejumpsandtheEckhoffapproximationarestudied.Exactconstantsoftheasymptoticerrorsarecomputed.Numericalexperimentsvalidatetheoreticalinvestigations.

  • 标签: 二元函数 逼近 傅里叶系数 线性方程组 近似函数 精确常数
  • 简介:ThechemicalcompositionandmicrostructureofTibetanmicrocrystallinemagnesitewerestudiedbymeansofXRF,XRDandFESEM.Itisfoundthatthemicrocrystallinemagnesitehasuniformlydistributedgrains,mostlyintherangeof2-4μm,andtheMgOcontentis47.80%.Infusedmagnesia,thedrusesarecolorlesstransparentpericlasemegacrystswithoutimpurity,whilethecrustsandiswhite,withahighMgOcontentupto97%-99%.Thepericlasecrystalsarebig,appearingasfacedandstep-growthmorphology.Massivesecondarylongcolumnarpericlaseiscrystallized.

  • 标签: 结晶行为 电熔镁砂 X射线荧光光谱法 MGO含量 高纯 方镁石
  • 简介:这份报纸报导巨浪的试验性、理论的学习发生在原型一台极端微离心的压缩机。作为第一步,10次缩放有40公里的一台极端微离心的压缩机的模型外部直径被设计并且生产。为有B参数的几不同价值的巨浪的短暂行为的详细试验性的调查被执行。试验性的结果在巨浪期间与非线性的lumped参数理论获得以便为微离心的压缩机验证理论巨浪模型的有效性的那些相比。作为结果,巨浪的相当不同的行为在实验并且在分析为B的不同价值出现了。关键词微离心的压缩机-澎湃-lumped参数模型CLC数字TK474.8+2

  • 标签: 微离心压缩机 汹涌 集中参量模型 外直径
  • 简介:这研究对比Papilioglaucus组,的四个成员的ovipositional侧面P。glaucus,P。multicaudatus,P。canadensis,和P。rutulus。我们使用了在七个植物家庭从主人包含叶子的产卵离子生物鉴定由P的成员利用了的七种选择。glaucus组。明确地,我们对比这些的全面ovipositional侧面种类和他们在一个新奇植物家庭的一位主人的接受(Populustremuloides:Salicaceae)并且在一个通常认为地祖先的寄植物家庭的一位主人(Liriodendrontulipifera:Magnoliaceae)。重要差别在P的ovipositional侧面之间被观察。glaucus和P。相对对方并且到P的multicaudatus。canadensis和P。rutulus。相反,没有重要差别在P的ovipositional侧面之间被观察。canadensis和P。rutulus,它也是接受了P的唯一的种类。tremuloides。不同于P的接受。tremuloides,L的接受。尽管有大多数的幼虫的无能,tulipifera在整个这个组是在场的在这个组到的种类利用这个宿主。当新奇主人应该被导出的人口仅仅接受时,这些结果支持“祖先的寄植物是可能的在ovipositional层次被保留的层次阀值模型”的预言。

  • 标签: 鳞翅类 寄生 植物相互性 生态环境
  • 简介:这篇论文在指导网络调查控制动态代理人的全球行为。代理人是Lyapunov马厩,在一根线被散布,并且通过一个指导网络交流。网络的通讯拓扑学被一张指导的图描绘,控制协议在简单线性分散的反馈法律被设计。我们学习代理人将分别地在下面完成聚集,和批评、分叉的轨道的不同条件。我们在网络下面的动态代理人系统上的调查被扩大到时间延期网络案例。而且,我们与二学习案例在系统的预先指定的虚拟领导人。数字模拟被给并且证明我们的理论结果是有效的。

  • 标签: 网络控制 代理人 行为 李雅普诺夫稳定 动态代理 控制协议
  • 简介:Incipientplasmonicbubbleformationisobservedaroundgoldnanopillarswithdifferentinter-nanopillarseparations.Theexperimentalmeasurementsandtheoreticalanalysisshowthatthenanobubbleformationisduetotheenhancedplasmonicresonanceratherthanfromthelaserheating.Inter-nanopillardistributionmayleadtothresholdfluencevariations.Thelifetimeofplasmonicbubblescanreachseveralminutes.Furthermore,boththeradiusandthegrowthrateoftheplasmonicnanobubbleincreaseastheinter-nanopillardistributiondecreases.Smaller-spacingdistributedarraysproducedlargerbubbles.Themaximumgrowthrateofthebubblescanbereachedatabout883.5×10-6m∕son1μmnanopillars,butitisonly56.9×10-6m∕son4μmnanopillars.

  • 标签: 金纳米粒子 空间控制 等离子体共振 微泡 行为 纳米柱
  • 简介:1IntroductionThenickelaloysandcomplexesarewidelyusedasmagnetic,optical,nuclearandsuperconductingmaterials[1,2].Manynickelcom...

  • 标签: Nickel CHLORIDE ELECTROCHEMICAL BEHAVIOR Transfer COEFFICIENT
  • 简介:Thesurfaceemittingmicrocavityisformedbysandwichingapolymerfilmcontainingpoly(para-phenylenevinylene)(BMPPV)andpoly(N-vinylcarbazole)(PVK)betweenaDBRwithareflectivityof99.5%andasilverfilm.Thesampleisopticallypumpedbya337.1nmlineofnitrogenlaserwith10nspulsesat20Hzrepetitionrate.ThelasingphenomenonisobservedinBMPPVandPVKmixturemicrocavity.Thefullwidthathalfmaximum(FWHM)is6nmatthepeakwavelengthof460nm.Thelasingthresholdenergyisestimatedtobeabout5μJ.

  • 标签: 聚合物激光 |
  • 简介:联机话题的传播,是socio心理的建筑群和信息传播过程,能显著地影响联机话题传播的联机公共opinion.The行为被探索,它的整齐被尝试到analyze.A将军模型因为联机话题的传播被介绍,并且描述一个联机话题的速度传播的微分方程是一个联机话题的derived.The速度传播了显示话题的发展的水平并且

  • 标签: 网上传播 行为 传播速度 一般模型 传播过程 社会心理
  • 简介:金属性的multilayers(NMM)很吸引了的nanoscale的机械行为从科学、实际的看法的注意。与他们的整体的对应物相比,在NMM存在的接口的大数字支配结构的合成材料的这个特殊的班的唯一的行为。当microlaminates的机械机制上有很多评论时,纳米技术的快速的开发为专门集中于NMM的一个基于性质的定义的概述带了紧迫的需要,他们的特别尺寸依赖者微观结构和机械性能。这篇文章试图在微观结构,机械性质和NMM的塑料变丑物理上提供全面、新的评论。我们希望这评论能完成二个目的:(1)介绍可伸缩和维的分析到研究NMM系统的科学家和工程师的基本概念,并且(2)提供接口行为和在NMM的接口在原子规模显示的非凡的质量的更好的理解。

  • 标签: 金属多层膜 力学性能 纳米级 结构复合材料 系统工程师 ITIES
  • 简介:ThechromiumoxidematerialswerepreparedusingCr2O3micropowderasmainstartingmaterial,TiO2micropowderassinteringaid,polyvinylalcoholasbinder,byaseriesofprocessessuchasslurrying,sprayinggranulation,machinemouldingandcoldisostaticpressing,andfiringat1500℃for3hinair(oxygenpartialpressurewas2.1×104Pa),industrialnitrogen(oxygenpartialpressurewas1×103Pa),purenitrogen(oxygenpartialpressurewas10Pa),highpuritynitrogen(oxygenpartialpressurewas0.1Pa),andcarboncakeembeddedatmosphere(oxygenpartialpressurewas2.3×10-12Pa).EffectsofoxygenpartialpressuresonthesinteringbehaviorofCr2O3materialswereinvestigated.Theresultsshowthat(1)for3wt%TiO2-dopedspecimens,thereisasubstantialdependenceofsinteringonoxygenpartialpressure(0.1Pa-2.1×104Pa),andthebulkdensityincreasesandapparentporositydecreaseswithoxygenpartialpressuredecreasing;(2)eveniftheoxygenpartialpressureis0.1Pa,thespecimenwithoutTiO2cannotreachdensificationsintering;(3)underverylowoxygenpartialpressureofcarbonembeddedatmosphere,Cr2O3materialscontainingTiO2ornotcanattaindensification.

  • 标签: 三氧化二铬 烧结行为 材料制备 大气 二氧化钛粉体 低氧分压
  • 简介:Rheologyofcastablesisgreatlyaffectedandcontrolledbyrheologicalbehavioroftheirmatrix.Inthiswork,therheologicalpropertiesofbauxite-basedcastablematrixhavebeenstudied.Theeffectsofsuper-finesilicaandaluminaaddition,water/cementratio,dispersantsandbauxiteparticle-sizeonviscosity,shearrateandshearstressoftheslurrieshavebeeninvestigated.Basedontheseresults,therangeofoptimumcompositionofthematrixwithgoodrheologicalbehaviorhasbeenobtained.

  • 标签: 流变行为 矩阵 矾土 浇注料 耐火材料
  • 简介:Thedecentralizationoftheenergysector'sinfrastructureiscommonlyunderstoodasanimportantsteptowardsanefficientandsustainableenergysystem.However,technicalmeasuresonlyhavealimitedimpactonthesystemsgoals.Thedecentralizationofdecision-making,theempowermentofhouseholdsandtheoccurrenceofprosumercommunitiesrequiremorehuman-centricapproachestomeetfuturechallenges;theapplicationofthesubsidiarityprincipleanddecentralizationseemsinevitablebutalsounclearinitsimplementationinanenergysystem,thecooperationbehaviorofcommunitymembersgainsinimportanceandthedesignofprosumercommunitiesmustovercomeeconomicproblems.Thisarticleemphasizesthehuman-centeredchallengeswhichgoalongwithprosumercommunities.Weapplyeconomicprinciplestorevealmajorproblemswhichgowiththeshiftsinenergy-relateddecision-makingtowardsprosumersandintegratebehavioralscienceforprosumercommunitydesign.Wehighlighttheimportanceofenergyasaninterpersonalconstruct;aviewonenergywhichwillgaininimportancewithinaprosumercommunitiesshapednetwork.IndexTermsCooperationBehavior,CrowdEnergy,EnergyEconomics,EnergyProsumer,ProsumerCommunityDesign.

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  • 简介:In2015,TheCentralBankcutinterestratessixtimesinarow.Therearetwomainpurposes:oneistoreducetheinterestburdenoncorporateloans,andstimulatecorporateinvestment.Second,toreduceinterestincomeonresidentialdeposits,andstimulateresidentstoincreasecurrentconsumption.However,manyempiricaldataprovethatalthoughtheeffectofinterestratedeclineonstimulatingcorporateinvestmentismoreobvious,theeffectofstimulatingresidentstoincreasecurrentconsumptionisnotobvious,andhouseholdsavingscontinuetogrowrapidly.Thisshowsthatthemainfactoraffectingthecurrentconsumptionofresidentsisnolongerthebank’sdepositinterestrate,buttheirreplaceabilityoffutureconsumergoodsforcurrentconsumergoods,incomerestrictionsandothereconomicfactorsthatcanaffectcross-timeconsumption.Thispaperisbasedonthetheoryofintertemporalutilitymaximization.TheempiricalanalysisoftheimpactoftheratechangeonChina’sresidents’consumption,lookingforthereasonswhyresidents’consumptionisnotsensitivetochangesintherate,andputforwardcorrespondingcountermeasuresandsuggestions.

  • 标签: intertemporal CHOICE RATE CHANGE RESIDENT CONSUMPTION