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简介：Inthispaper,anewmeasurmenttechniquefordeterminingthermalconductivityofsemitransparentmediainthetemperaturerange300-800Kisreported.TheexperimentalsetupisbasedonthesteppowerforcedtransienthotwiretechniqueItisassumedthattheradiativecontributiontotheheattransferprocessarisesfromemission,Notfromabsorption.Inthiscase,applicationofthe'thermalquadruples'methodallowsaverysimpleconstructionofanalyticalmodelsoftheexperimentalsetup.Theparametersensityvityanalysisdemonstratesthatthethermalconductivityofsemitransparentmeidiacanbedeterminedfromthehotwiretemperatureresponse,Theexperimentalresultsofakindofglassbetween300and800Karepresented.

简介：NanofluidswerepreparedbydispersingCunanoparticles(~20nm)inn-tetradecanebyatwo-stepmethod.Theeffectivethermalconductivitywasmeasuredforvariousnanoparticlevolumefractions(0.0001-0.02)andtemperatures(306.22-452.66K).TheexperimentaldatacompareswellwiththeJangandChoimodel.Thethermalconductivityenhancementwaslowerabove391.06Kthanforthatbetween306.22and360.77K.Theinterfacialthermalresistanceincreasedwithincreasingtemperature.Theeffectivethermalconductivityenhancementwasgreaterthanthatobtainedwithamoreviscousfluidasthebasemediaat452.66KbecauseofnanoconvectioninducedbynanoparticleBrownianmotionathightemperature.

简介：Aneworganicsemiconductortartaricaciddopedsaltofemeraldinepolyaniline(PANI-C4H6O6)hasbeenobtainedbythemethodofoxidativepolymerizationofmonomericanilinewithammoniumpersulfateinacidicsolution.ThestructurewascharacterizedbyFourierTransformInfraredtechnique(FTIR)andX-raydiffraction(XRD).Thetemperaturedependencedcconductivityδdc(T)showsasemiconductorbehaviorandfollowsthequasionedimensionalvariablerangehopping(Q1D-VRH)model.Dataonδdc(T)arealsodiscussed.

简介：有bimodal粒子尺寸的钻石/铜composites的热传导性被学习。composites与40和100颗m尺寸钻石的混合物通过液体铜的压力渗入被准备进钻石预先形成。有钻石的不同coarse-to-fine体积比率的预先形成的渗透被调查。有bimodal尺寸分发的钻石/铜composites的热传导性与从Chu开发的一个分析模型导出的理论价值相比。钻石/铜composites能到达更高热的传导性，他们的表面粗糙能被使用bimodal钻石粒子尺寸改进，这被预言。

简介：现在的学习在拉长的柱体上面对magnetohydrodynamics和热产生/吸收系数在威廉森液体的停滞点流动上揭示homogeneous/hetereogeneous反应的效果。进一步，可变热电导率和热层化的效果也被考虑。管理部分微分方程在类似转变的帮助下被变换成平常的微分方程。系统联合了非线性的平常的微分方程然后被射击解决技术。MATLAB射击代码被比较在限制情况与以前出版的工作验证。当现在的结果与MATLAB内建的功能bvp4c相比时，结果进一步被加强。突出的参数的效果为速度，温度和集中侧面图形地被商讨。为不同参数的皮磨擦系数和Nusselt数字在桌子的帮助下被调查。

简介：Theeffectivethermalconductivityofmatrix-inclusion-microcrackthree-phaseheterogeneousmaterialsisinvestigatedwithaself-consistentmicromechanicalmethod（SCM）andarandommicrostructurefiniteelementmethod（RMFEM）,IntheSCM,microcracksareassumedtoberandomlydistributedandpen-ny-shapedandinclusionstobespherical,thecrackeffectisaccountedforbyintroducingacrackdensitypa-rameter,theeffectivethermalconductivityisderivedwhichrelatesthemacroscopicbehaviortothecrackdensityparameter.IntheRMFEM,thehighlyirregularmicrostructureoftheheterogeneousmediaisaccu-ratelydescribed,theinteractionamongthematrix-inclusion-microcracksisexactlytreated,theinclusionshapeeffectandcracksizeeffectareconsidered.ANi/ZrO2particulatecompositematerialcontainingran-domlydistributed,penny-shapedcracksisexaminedasanexample.Themainresultsobtainedare:（1）theeffectivethermalconductivityissensitivetothecrackdensityandexhibitsessentiallyalinearrelationshipwiththedensityparameter;（2）theinclusionshapehasasignificanteffectontheeffectivethermalconductiv-ityandapolygon-shapedinclusionismoreeffectiveinincreasingordecreasingtheeffectivethermalconduc-tivitythanasphere-shapedone;and（3）theSCMandRMFEMarecomparedandthetwomethodsgivethesameeffectivepropertyinthecaseinwhichthematrixthermalconductivityλ,isgreaterthantheinclusiononeλ2.Intheinversecaseofλ1<λ2,thetwomethodsagreeastheinclusionvolumefractionandcrackdensityarelowanddifferastheyarehigh.Areasonableexplanationfortheagreementanddeviationbetweenthetwomethodsinthecaseofλ1<λ2ismade.

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简介：Thelocalthermalconductivityofpolycrystallinealuminumnitride(AlN)ceramicsismeasuredandimagedbyusingascanningthermalmicroscope(SThM)andcomplementaryscanningelectronmicroscope(SEM)basedtechniquesatroomtemperature.ThequantitativethermalconductivityfortheAlNsampleisgainedbyusingaSThMwithaspatialresolutionofsub-micrometerscalethroughusingthe3ωmethod.Athermalconductivityof308W/m·Kwithingrainscorrespondingtothatofhigh-puritysinglecrystalAlNisobtained.Theslightdifferencesinthermalconductionbetweentheadjacentgrainsarefoundtoresultfromcrystallographicmisorientations,asdemonstratedintheelectronbackscattereddiffraction.Amuchlowerthermalconductivityatthegrainboundaryisduetoimpuritiesanddefectsenrichedinthesesites,asindicatedbyenergydispersiveX-rayspectroscopy.

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：Inthispaper,weareconcernedwiththeglobalexistenceandconvergenceratesofthesmoothsolutionsforthecompressiblemagnetohydrodynamicequationswithoutheatconductivity,whichisahyperbolic-parabolicsystem.TheglobalsolutionsareobtainedbycombiningthelocalexistenceandaprioriestimatesifH3-normoftheinitialperturbationaroundaconstantstatesissmallenoughanditsL1-normisbounded.Aprioridecay-intimeestimatesonthepressure,velocityandmagneticfieldareusedtogettheuniformboundofentropy.Moreover,theoptimalconvergenceratesarealsoobtained.

简介：现在的分析在非线性的热放射的影响下面经过常常动人的表面讨论伊灵·鲍威尔nanofluid的边界层流动。热和集体转移机制在身体上合适的对流边界条件下面被检验。可变热电导率和化学反应的效果也被考虑。用Homotopy分析方法(火腿)的所有深奥分布的系列答案被获得。统治嵌入的流动参数的影响通过图形的插图被讨论。在与温度的关系的热放射参数表演增加趋势介绍，这被观察。然而，化学反应参数展出减少的行为对集中分发。

简介：粉状的LiCr0.35Mn0.65O2的电的传导性在温度范围在高压力下面被测量直到26.22GPa由使用一个钻石铁砧房间的300413K。电导率和激活热含量在5.36GPa和21.66GPa不连续地变化，这被发现。在压力范围1.105.36GPa，压力增加激活热含量并且减少散布的搬运人，它最后导致传导性增加。在压力范围6.3221.66GPa和22.6026.22GPa，有压力增加的激活热含量减少，它有积极贡献到电的电导率增加。二导致压力的结构的阶段转变被发现由在原处在高压力下面X光检查衍射，它导致电导率和激活热含量的不连续的变化。

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

简介：Aseriesofflexiblepoly(m-phenyleneisophthalamide)(PMIA)-basedcompositeswithdifferentsizesandmassfractionsofhexagonalboronnitride(hBN)weresuccessfullymanufacturedforthefirsttimeviathecastingtechnique.TheeffectsofmodifiedhBNparticlesonmicrostructure,mechanicalproperties,dielectricpropertiesandthermalconductivitiesoffabricatedcompositeswereinvestigated.TheresultsindicatethatmodifiedhBNparticlesmanifestgoodcompatibilitywiththePMIAmatrix.TheYoung'smodulusandTheat-resistanceindexofPMIA-basedcompositesareincreasedwithincreasingthemassfractionofhBNparticles.Duetoadditionalthermalconductivepathsandnetworksformedbynano-sizedhBNparticles,theK-m/n-hBN-30compositedisplaysthethermalconductivityof0.94W·m^-1·K^-1higherthanthatoftheK-m-hBN-30composite(0.86W·m^-1·K^-1),andmorethan4timeshigherthanthatofneatPMIA.Moreover,theobtainedPMIA-basedcompositesalsoshowlowdielectricconstantandidealdielectricloss.Owingtotheexcellentcomprehensiveperformance,hBN/PMIAcompositespresentpotentialapplicationsinthebroadfieldofelectronicmaterials.

简介：一系列线性稳定性分析面对粘性，热传导性和expansivity的空间变化在热传送对流的发作上被执行。我们考虑附加到静电干扰的无穷小的不安的时间的进化(不动)并且在加热basally的平面层的传导性的状态。从在有增加粘性的温度依赖的振幅的流动模式的变化，我们识别了转变进停滞盖(圣)政体，在传送对流在仅仅下面发生的地方一在最高的表面的冷液体厚、停滞盖。详细分析在空间变化在热电导率或expansivity导致的圣政体显示出传送对流房间的方面比率的重要增加：圣传送对流的水平长度规模能被多达50%与深度随热电导率的10次增加扩大。我们进一步开发了成功地复制了在物理性质为给定的空间变化增加圣政体传送对流房间的水平长度规模的机制的圣传送对流的一个分析模型。我们的调查结果可以在披风在传送对流模式上加亮热电导率的空间变化的必要角色。

简介：TheSiO2nanoparticleswerecoatedonthesurfaceofgrapheneoxide(GO)bysol-gelmethodtogettheSiO2-Gcompound.TheSiO2-GwasrestoredandoleophylicallymodifiedtopreparehydrophobicmodifiedSiO2-G(HM-SiO2-G)whichwassubsequentlyaddedtosiliconerubbermatrixtopreparetwo-componentroomtemperaturevulcanized(RTV-2)thermalconductivesiliconerubber.Themorphology,chemicalstructureanddispersityofthemodifiedgraphenewerecharacterizedwithSEM,FTIR,Raman,andXPSmethods.Inaddition,theheat-resistancebehavior,mechanicalproperties,thermalconductivity,andelectricalconductivityoftheRTV-2siliconerubberwerealsostudiedsystematically.TheresultsshowedthattheSiO2nanoparticleswerecoatedongrapheneoxidesuccessfully,andHM-SiO2-GwasuniformlydispersedinRTV-2siliconerubber.TheadditionofHM-SiO2-Gcouldeffectivelyimprovethethermalstability,mechanicalpropertiesandthermalconductivityofRTV-2siliconerubberandhadnogreatinfluenceontheelectricalinsulationperformance.

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