简介：Accordingtothegoodchargetransportingpropertyofperovskite,wedesignandsimulateap–i–n-typeall-perovskitesolarcellbyusingone-dimensionaldevicesimulator.Theperovskitechargetransportinglayersandtheperovskiteabsorberconstitutetheall-perovskitecell.Bymodulatingthecellparameters,suchaslayerthicknessvalues,dopingconcentrationsandenergybandsofn-,i-,andp-typeperovskitelayers,theall-perovskitesolarcellobtainsahighpowerconversionefficiencyof25.84%.Thebandmatchedcellshowsappreciablyimprovedperformancewithwidenabsorptionspectrumandloweredrecombinationrate,soweobtainahighJ_(sc)of32.47mA/cm~2.Thesmallseriesresistanceoftheall-perovskitesolarcellalsobenefitsthehighJ_(sc).Thesimulationprovidesanovelthoughtofdesigningperovskitesolarcellswithsimpleproducingprocess,lowproductioncostandhighefficientstructuretosolvetheenergyproblem.

简介：本文用三种方式给出计算队长L(t)的瞬时分布。

简介：TheexistenceanduniquenessofastrongperiodicsolutionoftheevolutionsystemdescribinggeophysicalflowinboundeddomainsofRN(N=3,4)areprovenifexternalforcesareperiodicintimeandsufficientlysmall.

简介：介绍了阻变存储器及其I-V特性的测试分析方法。通过测量三明治结构的阻变存储器的I-V特性,采用多种拟合方法,与导电机制原理对比,可以判断器件的导电机制,便于深入分析阻变机理。

简介：Copolymerizationofstyrene(St)andisoprene(IP)wascarriedoutwithacatalystsystemcomposeaofanhydrouslanthanidechloridehexamethylphosphoramidecomplex(LnCl3·HMPA)andaluminumorganiccompound(AOC).Amongthecatalystsexamined,catalystNdCl3·HMPA/AI(i-Bu)3showedahighactivityinthecopolymerizationundercertainconditionsgivingcopolymers(5%—15%Stcontent)withhighcis-1,4microstructureinIPunits(>95%).TheeffectsofHMPA/Ndmolarratio,Al/Ndmolarratio,monomer/Ndmolarratio,Stfeedratio,andthereactiontimeoncopolymerizationwereexaminedwiththiscatalyticsystem.Theobtainedcopolymerswerecharacterizedby^1Hand^13CNMRspectroscopiesandgel-permeationchromatography(GPC).

简介：Inliterature,nonlineartravelingwavesinelasticcircularrodshaveonlybeenstudiedbasedonsinglepartialdifferentialequation(pde)models,andhereweconsidersuchaproblembyusingamoreaccuratecoupled-pdemodel.WederivetheHamiltonianfromthemodelequationsforthelongfinite-amplitudewaveapproximation,analyzehowthenumberofsingularpointsofthesystemchangeswiththeparameters,andstudythefeaturesofthesesingularpointsqualitatively.Variousphysicallyacceptablenonlineartravelingwavesarealsodiscussed,andcorrespondingexamplesaregiven.Inparticular,wefindthatcertainwaves,whichcannotbecourltedbythesingle-equationmodel,canarise.

简介：近年来，国内企业界在CI设计的开发和导入过程中，形成了一系列令人瞩目的示范效应。这引起了理论界、设计界对CI作业过程中的管理问题的重视。本文着重探讨在CI作业过程中，引入计划-控制-计划管理循环的模式和具体方法。

简介：AseriesofRbxCs1-xAg4I5(x=0-1)thinfilmsweregrownbyvacuumevaporationonNaCIcrystalsubstratesat350K.Theabsorptionspectraofthesefilmsweremeasuredat80Kinthewavelengthrangefrom240nmto400nm.ItisshownthatsuperionicconductorthinfilmsofquaternarycompoundRb0.5Cs0.5Ag4I5andternarycompoundRbAg415canbeobtainedatx=0.5-0.6andx=0.7-1,respectively.Atx=0.65,thecombinedcompoundfilmofthemixtureof30mol%RbAg4I5and70mol%Rb0.5Cs0.5Ag4I5ispresented.Then,basedonthespectralpositionsoftheA1andA2peaks,wedeterminedthattheRb0.5Cs0.5Ag4I5excitoncouplingenergyRexis0.21eV,theforbiddenzonewidthEgis3.82eVandtheexcitonradiusaexis0.70hm.Furthermore,theionicconductivitiesofsuperionicconductorthinfilmsofRbAg4I5andRb0.5Cs0.5Ag4I5andtheirmixturefilmareinvestigated,respectively,inthetemperaturerange303K-393K.

简介：Inthisarticleweconsideratwo-levelfiniteelementGalerkinmethodusingmixedfiniteelementsforthetwo-dimensionalnonstationaryincompressibleNavier-Stokesequations.ThemethodyieldsaH^1-optimalvelocityapproximationandaL^2-optimalpressureapproximation.Thetwo-levelfiniteelementGalerkinmethodinvolvessolvingonesmall,nonlinearNavier-StokesproblemonthecoarsemeshwithmeshsizeH,onelinearStokesproblemonthefinemeshwithmeshsizeh<

简介：Inthispaper,normalincidenceverticalp-i-nphotodetectorsonagermanium-on-insulator(GOI)platformweredemonstrated.Theverticalp-i-nstructurewasrealizedbyion-implantingboronandarsenicatthebottomandtopoftheGelayer,respectively,duringtheGOIfabrication.Abruptdopingprofileswereverifiedinthetransferredhigh-qualityGelayer.Thephotodetectorsexhibitadarkcurrentdensityof~47mA∕cm~2at-1Vandanopticalresponsivityof0.39A/Wat1550nm,whichareimprovedcomparedwithstate-of-the-artdemonstratedGOIphotodetectors.Aninternalquantumefficiencyof~97%indicatesexcellentcarriercollectionefficiencyofthedevice.Thephotodetectorswithmesadiameterof60μmexhibita3dBbandwidthof~1GHz,whichagreeswellwiththeoreticalcalculations.Thebandwidthisexpectedtoimproveto~32GHzwithmesadiameterof10μm.ThisworkcouldbesimilarlyextendedtoGOIplatformswithotherintermediatelayersandpotentiallyenrichthefunctionaldiversityofGOIfornear-infraredsensingandcommunicationintegratedwithGeCMOSandmid-infraredphotonics.

简介：Forthequadraticsystem:x=-y+δx+lx^2+ny^21y=x(1+ax-y)undercondtions-1<1<0,n+l-1>0theauthordrawsinthe(a,b)parameterplanetheglobalbifurcationdiagramoftrajectoriesaroundO(0,0).Noticethatwhenna^2+1<0thesystemhasonesaddleN(0,1/n)andthreeantisaddles.

简介：以2-醛基吡啶和1，2-二（对氨基苯氧基）乙烷进行缩合得到Schiff碱配体L，然后与AgSbF6进行配位反应，得到了席夫碱配合物[Ag（L）SbF6]n，用元素分析、FT-IR和X-射线单晶衍射进行了表征．结果表明，配合物属于单斜晶系，P21／n空间群，每个Ag（I）的配位环境均为扭曲四面体，每个配体L通过其两端的2个N原子同2个金属离子配位桥联形成一维螺旋链结构．

简介：Shortpeptidesbasedonthetripeptides,Leu-Arg-ProandLeu-Lys-Pro,weresynthesizedbymicrowaveassistedsolid-phasesynthesismethod,inordertomakeasearchforpotentialinhibitorsforangiotensinI-convertingenzyme(ACE)withminimumsideeffectsinthetreatmentofhypertension.OnepeptidewiththesequenceLeu-Arg-Pro-Phe-PheshowsthestrongestinhibitiontowardsACEwithanIC50valueof0.26μmol/Linvitro.Thestudyofstructure-activityrelationshipshowsthattheintroductionofabulkygroupintotheN-terminalofthisseriesofinhibitorsmayenlargesterichindrance,resultinginthepoorinhibitoryactivitytowardsACE.TheinhibitoryactivitydecreasedinturnwhenL-Pro,D-ProorAc6cwasattheC-terminalrespectively.ThebindinginteractionbetweeneachoftheseinhibitorsandtesticularACE(tACE)wasperformedbymoleculardocking.TheresultssuggestthatLeu-Arg-Pro-Phe-PhemainlyoccupiedtheS1subsiteoftACE,andmadecontactwithtACEviasevenH-bonds.ItappearedthatthesiteonthepeptidethatboundwithtACEwasinfluencedbytheconfigurationoftheaminoacid,LorD-form,attheC-terminalofthepeptide.

简介：Theadsorptionoflowconcentrationoffreeacidbyregenerablechitinisfollowedbyelectricconductancedetermination.Theeffectofacidconcentratioin,contentoffunctioinalaminogroups,andionicstrengthonadsorptionwasdiscussed.Experimentalresultsindicatethattheactivecentreofregenerablechitinisthefreeaminogroupsonistsurface,andthattherateofadsorptionoffreeacidwasfoundtobeaffectedbytwofactors:theinteractionbetweentheadsorbentandtheadsorbateinsolutionandthatbetweentheadsorbatemoleculesorionsinsolution.

简介：结合自己的工作，对Gowers-Maurey系列成果获Fields奖以来的研究的新动态作一综述。本文是上篇，主要讨论含遗传不可分解空间在内的G－M型空间的若干品种。

简介：通过理论分析和PIC数值模拟,研究了阳极腔区结构对无箔二极管I-Ⅴ特性的影响,得到了束流强度和结构影响因子的变化规律.研究发现,当阴阳极间距大于0时,无箔二极管的结构影响因子随着阳极腔区半径的增大而减小并逐渐趋于稳定,且对于较小的阴极外半径、较大的漂移管半径、较大的阴阳极间距,达到稳定后的结构影响因子越小,并给出了结构影响因子的可调节范围.在TPG700脉冲驱动源上开展了初步实验研究,对实验中的回流电子束进行数值模拟分析并去除其影响以后,实验结果很好地符合了理论分析结论.

简介：本文考虑的是备货型商品的生产与优化管理。商品的生产过程是随机可控的。需求过程是一个根据销售价格高低来控制的随机过程。本文主要研究是这样一个系统的利润函数。

简介：Photonics-basedradarwithaphotonicde-chirpreceiverhastheadvantagesofbroadbandoperationandreal-timesignalprocessing,butitsuffersfrominterferencefromimagefrequenciesandotherundesiredfrequency-mixingcomponents,duetosingle-channelreal-valuedphotonicfrequencymixing.Inthispaper,weproposeaphotonicsbasedradarwithaphotonicfrequency-doublingtransmitterandabalancedin-phaseandquadrature(I/Q)de-chirpreceiver.Thisradartransmitsbroadbandlinearlyfrequency-modulatedsignalsgeneratedbyphotonicfrequencydoublingandperformsI/Qde-chirpingoftheradarechoesbasedonabalancedphotonicI/Qfrequencymixer,whichisrealizedbyapplyinga90°opticalhybridfollowedbybalancedphotodetectors.Theproposedradarhasahighrangeresolutionbecauseofthelargeoperationbandwidthandachievesinterference-freedetectionbysuppressingtheimagefrequenciesandotherundesiredfrequency-mixingcomponents.Intheexperiment,aphotonics-basedK-bandradarwithabandwidthof8GHzisdemonstrated.ThebalancedI/Qde-chirpingreceiverachievesanimage-rejectionratioofover30dBandsuccessfullyeliminatestheinterferenceduetothebasebandenvelopeandthefrequencymixingbetweenradarechoesofdifferenttargets.Inaddition,thedesireddechirpedsignalpowerisalsoenhancedwithbalanceddetection.Basedontheestablishedphotonics-basedradar,inversesyntheticapertureradarimagingisalsoimplemented,throughwhichtheadvantagesoftheproposedradarareverified.

简介：Amechanismisproposedfornucleatepoolboilingheattransferalongwithageneralmodelforbothpureliquidsandbinarymixtrues.Acombinedphysicalmodelofbubblegrowthisalsoproposedalongwithacorrespondingbubblegrowthmodelforpureliquidsonsmoothtubes.Usingthegeneralmodelandthebubblegrowthmodelforpureliquids,ananalyticaslmodelfornucleatepoolboilingheattransferofpureliquidsonsmoothtubesisdeveloped.

简介：ACupro-8-thioquinolinecoordinationpolymer,[Cu^I(C9H6NS)]n,wassynthesizedbymethano-thermalreactionofCuCland8,8′-dithiodiquinoline(dtdq)inamolarratioof2:1at160℃for7d.X-Raysinglecrystalstructuredeterminationrevealedtheformationofaone-dimensionalstructurebelongingtomonocliniccrystalsystem,spacegroupP21/cwithcellparametersa=0.8043(1)nm,b=1.8949(3)nm,c=1.1048(1)nm,β=110.109(4)°,V=1.5810(4)nm^3andZ=4,Thecrystalwasfoundtobestableuptoapproximately300℃bythermalanalysisandhaveanenergygap(Eg)of2.0eVexhibitedbyUV-Vis-NIRreflectancespectrum.