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  • 简介:在这篇文章,我们考虑q差别方程的某类型,它与Borel有meromorphic答案非凡零并且杆。我们也在有限顺序盒子中给精确结果,一些在一个特别盒子中推进结果在哪儿qi=qi。

  • 标签: 差分方程 性质 作者 亚纯解 极点 零点
  • 简介:LaCrO_3的nano粉末被一条大音阶的第五音胶化线路准备。从350~550K的LaCrO_3nano粉末的热能力被DSC方法测量并且是表示了:C_(p(LaCrO3))(±0.112)=166.844-8.500x10~(-3)T-1.022x10~6T~(-2)(J/(摩尔·K))(350-550K)。一个EMF测量集会为流电的房间作为电解质与CaF_2被开发。可逆房间的FrommeasuredEMF数据,(-)磅,La_2O_3,LaF_3,|CaF_2|O_2(1atm),LaF_3,LaCrO_3,Cr_2O_3,磅(+),和吉布斯的相关价值释放的O_2(1atm)精力,吉布斯LaCrO_3的形成的免费精力从700~885K被计算:ΔG_(f,LaCrO3)~Θ=-1555.364+0.354T(kJ/mol)(700-885K)。并且免费精力从简单氧化物La_2O_3andCr_2O_3反应改变的吉布斯是打算的是:ΔG_(f,公牛(LaCrO3))~Θ=-94.758+8.530x10~(-2)T(kJ/mol)(700-885K)。

  • 标签: 铬酸镧 吉布斯自由生成焓 热容量 电动势测量 纳米粉末
  • 简介:Thispaperstudiesasimpleasymmetricallyevolvedcommunitynetworkwithacombinationofpreferentialattachmentandrandomproperties.Animportantissueaboutcommunitynetworksistodiscoverthedifferentutilityincrementsoftwonodes,wheretheutilityisintroducedtoinvestigatetheasymmetricaleffectofconnectingtwonodes.Ontheotherhand,theconnectionoftwonodesincommunitynetworkscanbeclassifiedastwonodesbelongingtothesameortodifferentcommunities.Thesimulationresultsshowthatthemodelcanreproduceapower-lawutilitydistributionP(u)~uσ,σ=2+1p,whichcanbeobtainedbyusingmean-fieldapproximationmethods.Furthermore,themodelexhibitsexponentialbehaviourwithrespecttosmallvaluesofaparameterdenotingtherandomeffectinourmodelatthelow-utilityregionandapower-lawfeaturewithrespecttobigvaluesofthisparameteratthehigh-utilityregion,whichisingoodagreementwiththeoreticalanalysis.Thiskindofcommunitynetworkcanreproduceauniqueutilitydistributionbytheoreticalandnumericalanalysis.

  • 标签: 动能平衡 实体模型 理论物理学 研究 交通流
  • 简介:Thedielectricconstant,ε',andthedielectricloss,ε",forsomeselectedleadborateglasseswithinthefrequencyband105to107Hzandthetemperaturerange(20~50)℃weremeasured.Thedielectricdispersionandthedielectriclossabsorptionbandswereobserved,therelaxationtime,theactivationenthalpyandentropychangeofthedielectricrelaxationwerecalculated.Theresultsobtainedwerediscussedandcorrelatedtotheinternalnetworkstructureoftheglassesstudied.

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  • 简介:LighttransmissionspectraofTHFsolutionsofpoly(C60-co-methylmethacrylate)sandpoly(C60-co-styrene)scontinuouslyred-shiftwithincreasingconcentration.Formationoffullerenenanoclustersmayberesponsiblefortheunusualspectralshiftwithconcentration.Ithaslongbeenscientists’dreamto'tune'material’spropertiesbysimplemeans,andtheC60-containingpolymersrepresentsuchagroupofnovelmaterialswhoseopticalpropertiesarepredictablyandreversiblytunablebyasimplechangeinconcentration.

  • 标签: FULLERENE POLYMERS C60-styrene COPOLYMERS C60-MMA COPOLYMERS
  • 简介:Thethermodynamicpropertiesofcrystalscanberoutinelycalculatedbydensityfunctionaltheorycalculationscombiningwithquasi-harmonicapproximation.BasedonthemethoddevelopedrecentlybyWuandWentzcovitch(PhysRevB79:104304,2009)andWu(PhysRevB81:172301,2010),weareabletofurtherabinitioincludeanharmoniceffectonthermodynamicpropertiesofcrystalsbyoneadditionalcanonicalensemblewithnumbersofparticle,volumeandtemperaturefixed(NVT)moleculardynamicsimulations.Ourstudyindicatesthatphonon–phononinteractioncausestherenormalizedphononfrequenciesofwadsleyitedecreasewithtemperature.ThisisconsistentwiththeRamanexperimentalobservation.TheanharmonicfreeenergyofwadsleyiteisnegativeanditsheatcapacityatconstantpressurecanexceedtheDulong–Petitlimitathightemperature.Theanharmonicitystillsignificantlyaffectsthermodynamicpropertiesofwadsleyiteatpressureandtemperatureconditionscorrespondtothetransitionzone.

  • 标签: wadsleyite 热力学性质 非谐效应 密度泛函理论 声子频率 分子动力学
  • 简介:让B~α={B~α(t),t∈R~N}一(N,d)有林中小丘索引α∈(0,1)的部分Brownian运动。由非使用强壮的本地人B~α的宿命论,我们证明B~α的图象的一致Hausdorff尺寸结果的形式肯定什么时候N>αd。我们的结果为一个维的Brownian运动考夫曼扩大那些。

  • 标签: 分数布朗运动 Hausdorff维度 二维性质 不确定性
  • 简介:Propertiesofmagnesia-hercynitebrickwerestudied.Thecoatability,thermalshockresistance,corrosionresistancetocementclinkerandthermalconductivitywerecomparedwiththoseofmagnesia-chromebrickandmagnesia-spinelbrickusedwidelyinsinteringzoneofcementrotarykiln.Theresultshowsthatmagnesia-hercynitebrickisbetterthanmagnesia-chromebrickinthermalchockresistanceandcorrosionresistancetocementclinker,issimilartomagnesia-chromebrickandisbetterthanmagnesia-spinelbrickincoatabilityandthermalconductivity.

  • 标签: 氧化镁 铁尖晶石 铝镁合金 耐火材料
  • 简介:为海森堡组,我们介绍h-quasiconvexfunctions的概念。我们证明h-quasiconvex功能和h凸的集合的观点是相等的并且h-quasiconvex功能局部地从上面被围住,并且而且导出那h-convexfunctions局部地被围住,因此它是局部地由由Danielli-Garofalo-Nhieu使用最近的结果连续的Lipschitz。最后,我们给第一衍生物ofh-quasiconvex功能的L∞标准的估计。

  • 标签: 准凸函数 HEISENBERG群 H凸函数 凸集
  • 简介:Themainrequirementsforbatteryseparatorsarehighporositywhichcanservepathwaysoflithiumionandspaceforgelelectrolytestoimpregnateinamembraneandmechanicalstrengthtoalloweasyhandlingforbatteryassembly.Generally,itappearsthetrade-offrelationshipbetweentheporosityandmechanicalstrengthofthemembrane.PVdFcompositemembranescontainingnano-sizeclayswereusedtoimprovethemechanicalstrengthofthemembranewithoutaffectingthemembraneporosity.Thecompositemembraneswerepreparedbyphaseinversionmethodcontrollingthemembranepreparationconditionssuchasretentiontime.Theresultantmembranesshowincreasedmechanicalpropertieswithsimilarmembraneporosityaround80%comparedtothepristinePVdFmembrane.Incorporationofnonoclaycanbeconsideredasaneffectivemethodtoimprovethemechanicalstrengthinporousmembranesupports,especiallyinaseparator.

  • 标签: 聚偏氟乙烯膜 机械性能 多孔膜 纳米粘土 机械强度 高孔隙率
  • 简介:Linearmixedmodels(LMMs)havebecomeanimportantstatisticalmethodforanalyzingclusterorlongitudinaldata.Inmostcases,itisassumedthatthedistributionsoftherandomeffectsandtheerrorsarenormal.Thispaperremovesthisrestrictionsandreplacethembythemomentconditions.WeshowthattheleastsquareestimatorsoffixedeffectsareconsistentandasymptoticallynormalingeneralLMMs.Aclosed-formestimatorofthecovariancematrixfortherandomeffectisconstructedanditsconsistentisshown.Basedonthis,theconsistentestimatefortheerrorvarianceisalsoobtained.Asimulationstudyandarealdataanalysisshowthattheprocedureiseffective.

  • 标签: 线性混合模型 模型估计 性质 最小二乘估计 随机效应 协方差矩阵