简介：Trivalentdysprosium(Dy3+)activatednanocrystallineyttriumvanadate（YVO4）phosphorwassynthesizedviaco-precipitationmethod.ThepreparedsampleswerecharacterizedbyX-raydiffraction（XRD）,Fouriertransforminfraredspectroscopy（FTIR）,scanningelectronmicroscopy（SEM）,opticalabsorptionandphotoluminescence（PL）techniques.TheXRDpatternsrevealthetetragonalcrystallinephase.SEMimagesrevealthatDydopedYVO4nanocrystalsareagglomerated.EDAXconfirmstheformationofYVO4:Dy.FTIRspectrumshowstwostrongabsorptionbandsat459and761cm-1.Opticalabsorptionspectrumshowedthesurfacedefectsintheas-preparedsamples.ThePLemissionspectrumshowstwocharacteristicemissionbandsat485and575nm.Thestrongyellowemissionpeakat575nmisassignedto4F9/2→6H13/2hypersensitivetransitionofDy3+ions,StudyofCIEchromaticitydiagramindicatesthesuitabilityofthephosphorforthedevelopmentofyellow-greenLEDs.

简介：采用元胞自动机模型建立了05Cr17Ni4Cu4Nb不锈钢固溶过程的二维模型,模拟了固溶过程中的晶粒形核生长以及化合物相的扩散溶解,模拟结果动态地再现了固溶过程的微观组织特征。通过该模型分析了固溶温度和固溶时间对固溶处理后微观组织的影响。

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简介：利用硬度分布函数计算8620H钢淬透性,以最优淬透性计算结果的各主要化学成分值为基础指导生产,采用化学成分窄范围设计,保证主要化学元素成分控制范围：w（C）为±0.0075%,w（[Si]）为±0.03%,w（[Mn]）、w（[Cr]）、w（[Ni]）为±0.02%,w（[Mo]）为±0.01%,w（[Alt]）为±0.010%,w（[P]）、w（[S]）不超过0.020%,w（[B]）不超过0.0005%,并控制碳偏析指数0.95～1.05。产品实测J（1.5）、J（5.0）、J（7.9）、J（12.7）淬透性满足要求,淬透性带宽达到不大于6HRC,甚至不大于4HRC的水平。

简介：设计循环流化床锅炉时,针对锅炉参数、设计煤种选取合理的流化状态,考虑掺烧带来的相关问题,并针对这些问题在设计时做出相应改进,最终保证所设计的循环流化床锅炉能够环保、高效、经济的运行。

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简介：Er3+-Tm3+-Yb3+tri-dopedBaMoO4phosphorsweresynthesizedbyco-precipitationtechniqueandcharacterizedbyX-raydiffractionanalysis,absorptionstudyandfieldemissionscanningelectronmicroscopyanalysis.Upconversionaswellasdownconversionluminescencestudieswereperformedbyusingnearinfrared（980nm）andultraviolet（380nm）excitations.Energyleveldiagram,pumppowerdependenceandcolourcoordinatestudywereutilizedtodescribethemulticolorupconversionemissionproperties.Undersingle980nmdiodelaserexcitationthedualmodesensingbehaviourisrealizedviaStarksublevelsandthermallycoupledenergylevelsoftheTm3+andEr3+ionsinthepreparedtri-dopedphosphors.AcomparativefluorescenceintensityratioanalysisforintegratedemissionintensitiesarisingfromtheStarksublevels{1G4（a）and1G4（b）}andthermallycoupledenergylevels{2H11/2and4S3/2}oftheTm3+andEr3+ions,respectivelywascarriedoutinthepreparedtri-dopedBaMoO4phosphors.ThemaximumsensitivityforthermallycoupledenergylevelsoftheEr3+andStarksublevelsoftheTm3+ionwasreported.Thedevelopedphosphorscouldbeusefulinthedisplaydevicesandopticalthermometricapplications.

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