简介：

简介：Thestudyofthetriplejunctionsofthegrainboundariesinsomefccsolidsolutions,orderedalloysandintermetallicswithL12hasbeencarriedoutusingtheopticalmetallographyandTEMmethods.Two-typesofthetriplejunctionswerefoundinthealloysinvestigated(1),consistingoftheboundariesoftherandom(RT),and(2),consistingoftheRTboundaryandthespecialboundaries(ST).TherelativevaluesoftheRTandSTboundaryenergyweredeterminedonthebasisofthemeasurementsoftheanglesbetweenthegrainboundaryplanes.IthasbeenshownthattheenergyofSTboundariesincreaseswiththeincreaseofthestackingfault(SF)energy.TheenergyoftheRTboundariesdoesnotdependontheSFenergy.

简介：

简介：据相关媒体报道，目前，河北新能源领域一次性投资最大项目——晶龙集团旗下的晶澳太阳能有限公司三期工程在邢台市宁晋县奠基。新工程总投资达12亿元，设计规模为20条太阳能电池生产线。预计该工程将于2011年4月建成投产，可年产太阳能电池片600兆瓦。届时，晶龙集团宁晋基地太阳能电池片整体生产能力将达1400兆瓦。

简介：分析了尖晶石型钛酸锂（Li4Ti5O12）的结构,介绍了其制备方法,包括固相反应法、溶胶-凝胶法、水热合成法等.固相反应法易于实现工业化生产,但颗粒的形貌不易控制;溶胶凝胶法制得的Li4Ti5O12材料纯度高、粒径小,但是成本高;水热法合成材料的尺寸大小均一,但需要控制的条件多.此外,讨论了钛酸锂电化学性能的一些改性方法,包括减小颗粒尺寸、掺杂和碳包覆等,并展望了其发展方向.

简介：ThecompositenanofibersofSrTiO3/SrFe12O19withamolarratioof1:1anddiameterabout120nmwerepreparedbyelectrospinning.Effectsofcalcinationtemperatureontheformation,crystallitesize,morphologyandmagneticpropertywerestudiedbyinfraredspectroscopy,X-raydiffraction,scanningelectronmicroscopyandvibratingsamplemagnetometer.Thebinaryphaseofstrontiumferriteandtitanatewasformedafterbeingcalcinedat900℃for2handthecompositenanofiberswerefabricatedfromnanograinsofSrTiO3about24nmandSrFe12O19around33nm.ThecrystallitesizesforthenanofibersincreasewithincreasingcalcinationtemperatureandtheadditionofSrTiO3hasanobvioussuppressioneffectonSrFe12O19graingrowth.Thespecificsaturationmagnetizationandremanencetendtoincreasewiththecrystallitesize.Withincreasingcalcinationtemperaturefrom900to1050℃,thecoercivityincreasesinitially,achievingamaximumvalueof520.2kA·m-1at950℃,andthenshowsareductiontendency.

简介：

简介：据报道，科技部和教育部日前联合新认定了12家创新环境好、创新资源聚集、成果转化和科技企业孵化绩效显著、地方政府高度重视的大学科技园为国家大学科技园。

简介：在在precartilaginous干细胞(PSC)的区别上包含TGF-3基因进chondrocytes的KLD-12自我装配的肽nanofiber支架的文化的效果被学习。KLD-12被综合由固态方法。在TGF-3plasmid被装进KLD-12自我装配的肽nanofiber支架以后，DNA版本能力被调查。PSC和hTGF-3基因被装进KLD-123-D支架，并且MTT试金被执行调查房间增长，和ELASA试金被用来调查TGF-3的表示。特定的软骨矩阵被染色的量的即时PCR，immunohistochemistry和Alcian蓝色检验。与控制组相比，PSC的DNA合成水平在PSC在装载TGF-3plasmid的自我装配的肽nanofiber支架是有教养的3天以内到达了山峰，并且在2个星期以内维持了这高水平。MTT结果证明试验性的组的增长能力在控制组比那统计上高(P<0.05)。量的实时PCR建议在试验性的组的TGF-3积极PSC的百分比在控制组比那高(P<0.01)。ELISA试金证明TGF-3蛋白质水平在试验性的组PSC的上层清液增加了，在72h以后到达了山峰然后有点衰退了到高原阶段。与控制组相比，chondrocyte的特定的基因典型细胞外的矩阵显著地起来调整(P<0.01)。结果显示出在装载TGF-3plasmid的自我装配的肽nanofiber支架区分进chondrocytes的那PSC，它提供了一条新鲜途径给软骨织物工程。

简介：Nd_2Zr_2O_7isbeingexploredasanalternatethermalbarriercoating(TBC)materialforoperatingabove1300°C,andgreatefforthasbeenmadetoenlargeitsthermalexpansioncoefficient(TEC)andimproveitstoughness.Inthisstudy,Sc_2O_3wasdopedtoNd_2Zr_2O_7.Thephasestructure,TECsandtoughnessof((Nd_(1-x)Scx))_2Zr_2_O7(x=0,0.025,0.05,0.075,0.1)compoundswereinvestigated.((Nd_(1-x)Scx))_2Zr_2_O7(x=0,0.025,0.05,0.075)exhibitedpyrochlorestructure,while((Nd_(0.9)Sc_(0.1)))_2Zr_2O_7consistedofpyrochloreandfluoritephases.WiththeincreaseoftheSc_2O_3content,theorderingdegreeofthepyrochloreinthecompoundsdecreased.In((Nd_(1-x)Scx))_2Zr_2O_7series,((Nd_(0.925)Sc_(0.075)))_2Zr_2O_7exhibitedthelargestTEC,whilethetoughnessofthecompoundsincreasedwithincreasingtheSc_2O_3content.Therelatedmechanismswerediscussedbasedonthecrystalstructureanalysis.ConsideringtheTECandtoughness,10mol%Sc_2O_3wassuggestedastheoptimaldopingcontentforNd_2Zr_2O_7ceramic.

简介：包含Pechini方法和火花血浆sintering(SPS)方法的一条典型途径为高密度Li5+xSrxLa3xBi2O12的准备被介绍(x=0，1)陶艺。阶段形成，微观结构，谷物尺寸和标本的电的性质用XRD，SEM和交流电阻抗光谱学(酸)被检验。有纯像石榴石的阶段，97%的相对密度和大约5m的平均谷物尺寸的稠密的Li5La3Bi2O12和Li6SrLa2Bi2O12陶艺用这条途径被制作。在陶艺由SPS方法准备了的Li5La3Bi2O12和Li6SrLa2Bi2O12的298K的全部的传导性是5.1吗？？

简介：Withpositronannihilationradiationonedimensionangular-correlationdevice,itismeasuredthatpositronannihilationradiationonedimensionangular-correlationcurvesofpolycrystalsodiumionconductorNa5Y1-xCrxSi4O12（NYCS）system.Afterelectronmomentumdistributioncurvesarenormalized,linearparametersarecalculated.TheparametersH,WandSshowthechangeofNa+ionvacancyconcentrationinNYCSseriessamples.TheresultsshowthatparametersH,WandSofonedimensionangular-correlationcurvesofthosesamplesvarygreatlywithCr2O3contents.WithCr2O3contentincreasing,HandSparametersincrease,butWdecreases,andreachesextremesatx=0.05;thenwithCr203addingcontinually,parametersHandSdecreasegradually,parameterWincreasesgradually.Thisshowsthat,inaddtiontoCr2O3,theconductivityhascloserelation

简介：

简介：Er^3+-dopedSrBi4Ti4O15-Bi4Ti3O12(SBT-BIT-xEr^3+,x=0.00,0.05,0.10,0.15and0.20)inter-growthceramicsweresynthesizedbythesolid-statereactionmethod.Structural,electricalandup-conversionpropertiesofSBT-BIT-xEr^3+wereinvestigated.Allsamplesshowedasinglephaseoftheorthorhombicstructure.RamanspectroscopyindicatedthattheEr^3+substitutionforBi^3+atAsitesofthepseudo-perovskitelayerincreasesthelatticedistortionofSBT-BIT-xEr^3+ceramics.ThesubstitutionofBi^3+byEr^3+leadstoadecreaseofdielectriclosstanδandanincreaseofconductivityactivationenergy.Piezoelectricconstantd33wasslightlyimproved,butdielectricconstantwasdecreasedwiththeEr^3+doping.TheSBT-BIT-xEr^3+ceramicwithx=0.15exhibitstheoptimizedelectricalbehavior(d33~17pC/N,tanδ~0.83%).Moreover,twobrightgreen(532and548nm)andonered(670nm)emissionbandswereobservedunderthe980nmexcitation.Optimizedemissionintensitywasalsoobtainedwhenx=0.15fortheSBT-BIT-xEr^3+ceramic.Therefore,thiskindofceramicsoughttobepromisingcandidatesformultifunctionaloptoelectronicapplications.

简介：

简介：以超重力场辅助燃烧合成技术制备了呈梯度分布的Y2O3-Al2O3-SiO2玻璃／Y3Al5O12陶瓷梯度复合材料。结果表明，梯度布置两种组分的原料既可防止下层熔体的喷溅，又能提高上层玻璃的透过率。该梯度材料沿超重力方向依次为YAS透明玻璃层、YAS-YAG玻璃陶瓷层和YAG陶瓷层。