简介：Amonolithichybridfuelcell(MHFC)withanovelconfigurationwasproposedinanefforttoimprovethefuelcellperformanceduringinstantaneouspowerchanges.Amodifieddirectmethanolfuelcell(DMFC)withalayerofhydrousrutheniumdioxide(RuO2·xH2O)sandwichedbetweentheanodecatalystlayerandmembranewasusedtodemonstratetheprincipleoftheMHFC.ExperimentalresultsindicatethattheRuO2·xH2Olayerisequivalenttoaresistor-capacitortransmissionlineandfunctionssimilartoacapacitorinparallelwiththeanodeelectrode.TheimprovementindynamicresponseoftheMHFCwasexperimentallyconfirmedunderstepcurrentchangeandsquarecurrentpulseoperating.TheionicconductivityoftheRuO2·xH2Olayerwasalsoobtained.

简介：Anovelburningtechniqueformakingasemiconductingsingle-walledcarbonnanotubes(SWNTs)transistorassembledbythedielectrophoreticforcewassuggested.Thefabricationprocessconsistedoftwosteps.First,toalignandattachabundleofSWNTsbetweenthesourceanddrain,thealternating(AC)voltagewasappliedtotheelectrodes.WhenabundleofSWNTswasconnectedbetweentwoelectrodes,someofmetallicnanotubesandsemi-conducingnanotubesexistedtogether.ThesecondstepistoburnthemetallicSWNTSbyapplyingthevoltagebetweentwoelectrodes.Withincreasingthevoltage,morecurrentflowedthroughthemetallicSWNTs,thus,themetallicSWNTsburntearlierthanthesemiconductingone.Thistechniqueenablestoobtainonlysemi-conductingSWNTsconnectioninthetransistor.ThroughtheI—Vcharacteristicgraph,themomentofmetallicSWNTsburningandthecharacteristicofsemi-conducingnanotubeswereverified.

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简介：DD6alloywasbondedbytransientliquidphase(TLP)diffusionbonding.Themaincompositionsoftheinterlayeralloyemployedweresimilartothoseofthebasemetal,DD6,andacertainamountofelementBwasaddedasthemeltingpointdepressant.Theresultsshowthatitisdifficulttoobtainthejointswiththemicrostructurescompletelyhomogeneous.ForthejointTLPdiffusionbondedat1290℃for12h,abouthalfareasofthebeampossessedαγ+γ′microstructure,nearlyidenticalwiththatofthebasemetal,andtheotherlocalareasconsistedofT-solution,borides,etc.Prolongingthebondingtimeto24h,theinhomogeneousareasinthejointreduced,andthejointpropertyimproved.Thejointstress-rupturestrengthat980℃and1100℃reached90%-100%and70%-80%ofthoseofthebasemetalrespectively.

简介：Anovelstar-likesingle-crystalZnOstructurewassynthesizedbyasimplesolvothermalmethod.Theas-preparedproductswerecharacterizedbyXRD,SEMandTEM.Thestar-likeZnO,whichshowssixfoldsymmetry,wasconstructedbysixuniformarmsdistributingsymmetricallyaroundthe[0001]zoneaxis.Itisalsofoundthatthearmsarenotperpendiculartothe[0001]zoneaxisandeacharmisgrownatacertainanglewiththe[0001]direction.CBEDpatternandcorrespondingsimulationdemonstratethattheconvexpartofthestar-likeZnOisO-terminated(000-1)planeandtheconcavepartisZn-terminated(0001)plane.H2Splaysacrucialroleinthesynthesisprocess.Theanisotropicgrowthhabitalong[0001]and[000-1]resultsintheformationofstar-likestructure.

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简介：Microstructureoftransientliquidphase(TLP)diffusionbondedathirdgenerationsinglecrystalsuperalloyjointwasinvestigatedusingscanningelectronmicroscopy(SEM),andmechanicalpropertiestestofjointwascarriedout,forobtainingrelationshipbetweenmicrostructureandmechanicalpropertiesofjoint.Theresultsshowedthatthejointcontainedbondingzoneandbasemetal.Thediffusionzonewasobviouslyobserved.Whenitwasnotfinishedforisothermalsolidificationprocess，thebondingzonewouldcontainisothermalsolidificationzoneandrapidsolidificationzone.Metallographicexaminationrevealedthatisothermalsolidificationzonewasconsistedofyandphase.Rapidsolidificationzonewasconsistedoftwodifferentstructures,whichwereternaryeutecticofborides,yandy,phasedevelopingattheedgeofjoint,binaryeutecticofyandphaseappearingintheportionofjoint.Whenitwasnotenoughforhomogenizationprocessundertheconditionoffinishingisothermalsolidificationprocess,thebondingzonewouldcontainisothermalsolidificationzoneandboridesattheinterface.Undertheconditionsofrelativelyhighweldingtemperatureandlongweldingtime,averagetensilestrengthofjointwasequivalenttothatofparentmaterial.

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简介：基于AB_5的氢存储薄电影(LaNi_(4.25)Al_(0.75))，由dc磁控管劈啪作响的扔的onCu底层在这研究被调查。X光检查衍射(XRD)表明层的微观结构在晶形。SEM和AFM分析证明这部电影看起来与近似在nmdiameter的15-40的众多的随机大小的毛孔相当不平。这部电影的结构的稳定性被DSC，XRD，andS他们，它显示这部电影在500K左右下面维持了它的结构的稳定性，和网络结构的联合分析检验在为30min在700K被加热以后在这部电影上被观察。这些电影的Electrochemicalhydrogen存储性质被模仿的电池测试调查。单人赛分层的LaNi_(4.25)Al_(0.75)大批拍摄类似于典型AB_5合金的展出电气化学的氢存储性质，这被发现，并且这部电影的最大的分泌物能力关于220mAh/g。在20个控告/解除周期以后，小塑造针的铝氧化物在电影表面的一些部分上被形成。