简介:ThepaperconsiderstheKrylov-LanczosandtheEckhoffapproximationsforrecoveringabivariatefunctionusinglimitednumberofitsFouriercoefficients.Theseapproximationsarebasedoncertaincorrectionsassociatedwithjumpsinthepartialderivativesoftheapproximatedfunction.ApproximationoftheexactjumpsisaccomplishedbysolutionofsystemsoflinearequationsalongtheideaofEckhoff.AsymptoticbehaviorsoftheapproximatejumpsandtheEckhoffapproximationarestudied.Exactconstantsoftheasymptoticerrorsarecomputed.Numericalexperimentsvalidatetheoreticalinvestigations.
简介:ThechemicalcompositionandmicrostructureofTibetanmicrocrystallinemagnesitewerestudiedbymeansofXRF,XRDandFESEM.Itisfoundthatthemicrocrystallinemagnesitehasuniformlydistributedgrains,mostlyintherangeof2-4μm,andtheMgOcontentis47.80%.Infusedmagnesia,thedrusesarecolorlesstransparentpericlasemegacrystswithoutimpurity,whilethecrustsandiswhite,withahighMgOcontentupto97%-99%.Thepericlasecrystalsarebig,appearingasfacedandstep-growthmorphology.Massivesecondarylongcolumnarpericlaseiscrystallized.
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。
简介:Incipientplasmonicbubbleformationisobservedaroundgoldnanopillarswithdifferentinter-nanopillarseparations.Theexperimentalmeasurementsandtheoreticalanalysisshowthatthenanobubbleformationisduetotheenhancedplasmonicresonanceratherthanfromthelaserheating.Inter-nanopillardistributionmayleadtothresholdfluencevariations.Thelifetimeofplasmonicbubblescanreachseveralminutes.Furthermore,boththeradiusandthegrowthrateoftheplasmonicnanobubbleincreaseastheinter-nanopillardistributiondecreases.Smaller-spacingdistributedarraysproducedlargerbubbles.Themaximumgrowthrateofthebubblescanbereachedatabout883.5×10-6m∕son1μmnanopillars,butitisonly56.9×10-6m∕son4μmnanopillars.
简介:1IntroductionThenickelaloysandcomplexesarewidelyusedasmagnetic,optical,nuclearandsuperconductingmaterials[1,2].Manynickelcom...
简介:Thesurfaceemittingmicrocavityisformedbysandwichingapolymerfilmcontainingpoly(para-phenylenevinylene)(BMPPV)andpoly(N-vinylcarbazole)(PVK)betweenaDBRwithareflectivityof99.5%andasilverfilm.Thesampleisopticallypumpedbya337.1nmlineofnitrogenlaserwith10nspulsesat20Hzrepetitionrate.ThelasingphenomenonisobservedinBMPPVandPVKmixturemicrocavity.Thefullwidthathalfmaximum(FWHM)is6nmatthepeakwavelengthof460nm.Thelasingthresholdenergyisestimatedtobeabout5μJ.
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。
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.
简介:Rheologyofcastablesisgreatlyaffectedandcontrolledbyrheologicalbehavioroftheirmatrix.Inthiswork,therheologicalpropertiesofbauxite-basedcastablematrixhavebeenstudied.Theeffectsofsuper-finesilicaandaluminaaddition,water/cementratio,dispersantsandbauxiteparticle-sizeonviscosity,shearrateandshearstressoftheslurrieshavebeeninvestigated.Basedontheseresults,therangeofoptimumcompositionofthematrixwithgoodrheologicalbehaviorhasbeenobtained.
简介:Thedecentralizationoftheenergysector'sinfrastructureiscommonlyunderstoodasanimportantsteptowardsanefficientandsustainableenergysystem.However,technicalmeasuresonlyhavealimitedimpactonthesystemsgoals.Thedecentralizationofdecision-making,theempowermentofhouseholdsandtheoccurrenceofprosumercommunitiesrequiremorehuman-centricapproachestomeetfuturechallenges;theapplicationofthesubsidiarityprincipleanddecentralizationseemsinevitablebutalsounclearinitsimplementationinanenergysystem,thecooperationbehaviorofcommunitymembersgainsinimportanceandthedesignofprosumercommunitiesmustovercomeeconomicproblems.Thisarticleemphasizesthehuman-centeredchallengeswhichgoalongwithprosumercommunities.Weapplyeconomicprinciplestorevealmajorproblemswhichgowiththeshiftsinenergy-relateddecision-makingtowardsprosumersandintegratebehavioralscienceforprosumercommunitydesign.Wehighlighttheimportanceofenergyasaninterpersonalconstruct;aviewonenergywhichwillgaininimportancewithinaprosumercommunitiesshapednetwork.IndexTermsCooperationBehavior,CrowdEnergy,EnergyEconomics,EnergyProsumer,ProsumerCommunityDesign.
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.
简介:AcomputerscientistatWashingtonUniversityinSt.Louishasdevelopedawaytocoaxcellstodonaturalthingsunderunnaturalcircumstances,whichcouldbeusefulforstemcellresearch,genetherapyandbiofuelproduction.MichaelBrent,theHenryEdwinSeverProfessorofEngineeringintheSchoolofEngineering&