简介：AnewapproachtoproducesuperfineWC-Copowderbydirectreductionandcarbonizationisproposed.Water-solublesaltscontainingWandCowereusedasrawmaterials.Tungstenandcobaltoxidepowder(CoWO4/WO3)wasfirstformedbyaspray-pyrolysistechnique,whichwasthenmixedwithcarbonblackandconvertedtoWC-Cocompositepowderat950℃for4hinN2atmosphere.Theresultingpowderhasaparticlesizeof100-300nm.

简介：Theobjectivestressrateisaratherimportantprobleminmechanicsoffinitedeformation.Inthispaper,theobjectivestressrateinco-movingcoordinateisderivedbyapplyingnonlineargeometricfieldtheoryofdeformation.Problems.suchaxlargeextensioncoupledwithrotation,andlargesheardeformation,areexemplifiedbyusingthenewformula.ComparingwithJaumann’sstressrateandotherformulaepresentedincurrentliterature,thenewresultappearstobethereasonableoneinco-movingcoordinatesystem.

简介：Inco-ionicconductingsolidoxidefuelcell(SOFC),bothoxygenion(O2)andproton(H+)cantransportthroughtheelectrolyte,generatingsteaminboththean-odeandcathode.ThusthemasstransportphenomenonintheelectrodesisquitedifferentfromthatinconventionalSOFCwithoxygenionconductingelectrolyte(O-SOFC)orwithprotonconductingelectrolyte(H-SOFC).Thegenerationofsteaminbothelectrodesalsoaffectstheconcentrationover-potentiallossandfurthertheSOFCperformance.However,nodetailedmodelingstudyonSOFCswithco-ionicelectrolytehasbeenreportedyet.Inthispaper,anewmathematicalmodelforSOFCbasedonco-ionicelectrolytewasdevelopedtopredictitsactualperformanceconsideringthreemajorkindsofoverpotentials.Ohm'slawandtheButler-Volmerformulawereusedtomodeltheionconductionandelectrochemicalreactions,respectively.Thedustygasmodel(DGM)wasemployedtosimulatethemasstransportprocessesintheporouselectrodes.Parametricsimulationswereperformedtoinvestigatetheeffectsofprotontransfernumber(tH)andcurrentdensity(jtotal)onthecellperformance.Itisinterestingtofindthattheco-ionicconductingSOFCcouldperformbetterthanO-SOFCandH-SOFCbychoosinganappropriateprotontransfernumber.Inaddition,theco-ionicSOFCshowssmallerdifferencebetweentheanodeandcathodeconcentrationoverpotentialsthanO-SOFCandH-SOFCatcertaintHvalues.TheresultscouldhelpmaterialselectionforenhancingSOFCperformance.

简介：Perovskite-typeLa1-xCexMnO3（x=0-10%）catalystswerepreparedbyflamespraypyrolysisandtheiractivitiesduringthecatalyticoxidationofbenzenewereexaminedoverthetemperaturerangeof100-450℃.ThestructuralpropertiesandreducibilityofthesematerialswerealsocharacterizedbyX-raydiffraction（XRD）,N2adsorption/desorption,H2temperature-programmedreduction（H2-TPR）andX-rayphotoelectronspectroscopy（XPS）.TheincorporationofCewasfoundtoimprovethebenzeneoxidationactivity,andtheperovskiteinwhichxwas0.1exhibitedthehighestactivity.Phasecompositionandsurfaceelementalanalysesindicatedthatnon-stoichiometriccompoundswerepresent.TheincorporationofCehadanegligibleeffectonthespecificsurfaceareaoftheperovskitesandhencethisfactorhaslittleimpactonthecatalyticactivity.IntroductionofCe44+resultedinmodificationofthechemicalstatesofbothB-siteionsandoxygenspeciesandfacilitatedthereducibilityoftheperovskite.ThesurfaceMn4+/Mn3+ratiowasincreasedasaresultofCe4+substitution,whileadecreaseinthesurface-adsorbedO/latticeO(Oads/Olatt)ratiowasobserved.Therelationshipbetweenthesurfaceelementalratiosandcatalyticactivitywasestablishedtoallowabetterunderstandingoftheprocessbywhichbenzeneisoxidizedoverperovskites.

简介：AconstitutiveequationtheoryofOldroydfluidBtype,i.e.theco-rotationalderivativetype,isdevelopedfortheanisotropic-viscoelasticfluidofliquidcrystalline(LC)polymer.Analyzingtheinfluenceoftheorientationalmotiononthematerialbehaviorandneglectingtheinfluence,theconstitutiveequationisappliedtoasimplecaseforthehydrodynamicmotionwhentheorientationalcontributionisneglectedinitandtheanisotropicrelaxation,retardationtimesandanisotropicviscositiesareintroducedtodescribethemacroscopicbehavioroftheanisotropicLCpolymerfluid.UsingtheequationfortheshearflowofLCpolymerfluid,theanalyticalexpressionsoftheapparentviscosityandthenormalstressdifferencesaregivenwhichareinagoodagreementwiththeexperimentalresultsofBaeketal.Forthefiberspinningflowofthefluid,theanalyticalexpressionoftheextensionalviscosityisgiven.

简介：W，N共同做TiO2nanoparticles被一个solgel方法综合。准备样品被X光检查衍射(XRD)描绘，域排放扫描电子显微镜学(FE-SEM)，传播电子显微镜学(TEM)，Fourier变换红外线的光谱学(英尺红外)，X光检查光电子光谱学(XPS)和弥漫的反射spectrophotometry(医生)。结果证明共同做的光催化剂是有22.5nm的最小的粒子尺寸的实质上一致的球形的粒子。比作未做的TiO2，N-TiO2和P-25，W的吸收边，N共同做转移到更长的波长的TiO2和它为在Xe灯(350W)下面的甲基橘子(瞬间)的降级的photocatalytic活动更高。

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简介：在现在的纸，最大的Lyapunov代表为一种合作尺寸被调查在上的二个分叉系统一三维中央对由围住的噪音的参量的刺激歧管、使\O遭到。由使用一个不安方法，一个一个维的阶段散开过程的不变的措施的表情为三个案例被获得，在哪个矩阵B的不同形式，那在噪音刺激术语被包括，被假定然后作为结果，为一个维的阶段散开过程的所有三种单个边界被分析。经由Monte-Carlo模拟，我们发现不变的措施的分析表情遇见数字的很好。并且而且，P分叉行为为一个维的阶段散开过程被调查。为为一个维的阶段散开过程的单个边界的三个案例，最后，最大的Lyapunov代表的分析表达式为随机的分叉系统被介绍。

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简介：这篇论文在磁铁矿(Fe3O4)的弱磁性的帮助地的合成上论述试验性的结果在一个氧化一起沉淀方法的nano粒子，与没有磁性的正式就职的盒子相比。XRD结果证明在220G下面的弱磁性的正式就职能从goethite(α-FeOOH)加速阶段转变到磁铁矿(Fe3O4)，并且影响水晶结构，粒子尺寸/形态学和磁铁矿nano粒子的磁性的反应综合。另外，在合成反应的FeCl2答案的更高的集中导致了更好的粒子，有或没有磁性的正式就职。

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