Luminescence properties of Tm^3＋/Yb^3＋, Er^3＋/Yb^3＋ and Ho^3＋/Yb^3＋ activated calcium tungstate

CaWO4 phosphor activated by the Tm3+/Yb3+,Er3+/Yb3+ and Ho3+/Yb3+ ions were synthesized by a traditional high-temperature solid-state method.The crystal structures and morphologies of the products were characterized by X-ray powders diffraction method(XRD) ,infrared spectra(FT-IR) and scanning electron microscopy(SEM) .The samples were found to show up-conversion luminescence properties.CaWO4 doped with Tm3+/Yb3+ showed blue luminescence characteristic of Tm(III) ion in the range of 460-485 nm,corresponding to the 1G4→3H6 electronic transition.CaWO4 doped with Er3+/Yb3+ showed strong green luminescence at 510-565 nm(2H11/2,4S3/2→4I15/2) and weak red luminescence at 640-685 nm(4F9/2→4I15/2) of Er(III) ion.CaWO4 doped with Ho3+/Yb3+ phosphor emitted green luminescence at 525-560 nm(5S2,5F4→5I8) and red luminescence at 630-670 nm(5F5→5I8) and at 730-770 nm(5S2,5F4→5I7) ,which is the characteristic of Ho(III) ion.     

FoxBASE与Borland C＋＋接口技术浅谈

在现代计算机管理中，大都使用ＦｏｘＢＡＳＥ＋来实现用户需求，但有许多问题它本身无法解决。如屏幕保存、恢复等，为使其更为完善，在Ｃ＋＋中发现了具有强大功能的库函数，通过研究，找到了两者之间的接口和联系。通过结合，一些原本无法解决的问题迎刃而解。     

Effects of Ce3＋ , Nd3＋ , Gd3＋, Tb3＋ and Lu3＋ ions on Formation of CaCO3

The effects of lanthanides at various concentrations on CaCO3 crystal growth were studied by X-ray diffraction (XRD), infrared spectra (IR), X-ray photoelectric energy spectra (XPS) and inductively coupled plasma mtms spectrometry (ICP-MS). It was found that the calcite, a stable form of CaCO3 in thermodynamics, is the predominant species. The research indicates that lanthanide ions (Ln3 ) can partly substitute the Ca2 in the lattice of CaCO3 crystals, and change the crystal characterization and direct the ordinal growth of CaCO3 crystals.     

使用C^＋＋Builder开发数据库应用系统

介绍使用Ｃ＾＋＋Ｂｕｉｌｄｅｒ开发桌面数据库应用系统的一般方法。     

VisualC＋＋5.0在连铸生产中的应用

本文叙述了用WINDOWS开发工具VisualC 5.0编写连铸机上位工作站应用程序,实现生产过程监控、生产分厂局域网连铸生产过程数据库,应用网络技术实现生产信息数据库共享,为有效地分析冶炼、连铸、生产过程,实现最佳的生产过程控制与决策提供数据。     

软锰矿中Mn^2＋、Mn^3＋、Mn^4＋的测定

通过对软锰矿中Mn^2 ,Mn^3 ,Mn^4 的溶解条件进行研究，建立了软锰矿中3种价态锰的测定方法。     

Effect of solvent on luminescence properties of re-dispersible LaF3：Ln3＋ （Ln3＋=Eu3＋, Dy3＋, Sm3＋ and Tb3＋） nanoparticles

LaF3:Ln3+(Eu3+,Dy3+,Sm3+ and Tb3+) nanoparticles were prepared in different solvents such as water,EG(ethylene glycol),DMSO(dimethyl sulfoxide) and their mixed solvents at a relatively low temperature of 150 oC by simple chemical route.All the prepared samples showed hexagonal phase and exhibited spherical morphology.The highest luminescence intensity was observed for the samples prepared in EG than the samples prepared in other solvents.However,the sample prepared in water showed anomalously higher luminescence intensity than that of the sample prepared in DMSO.     

基于Visual C＋＋的ORACLE数据库访问技术

介绍使用Visual C 开发基于ORACLE数据库应用程序的两种方法。一种是PRO^*C，另一种是使用ODBC中间件访问数据库，并对这两种方法作了比较。     

Structural and optical studies of Yb^3＋, Er^3＋ and Er^3＋/Yb^3＋ co-doped phosphate glasses

Phosphate glass samples with various Yb2O3 and Er2O3 contents were synthesized by the conventional melt quenching technique and characterized by X-ray diffraction,IR absorption spectroscopy and Raman scattering spectroscopy.The absorption,emission spectra and fluorescence decay studies were carried out both at low and room temperatures.Results showed the existence of several sites occupied by the rare earth ions in the phosphate glass.Up-conversion and cooperative fluorescence were also discussed.     

Photoluminescent and Electroluminescent Properties of Ligand Emitting y^3＋, La^3＋, Gd^3＋ and Lu^3＋ Complexes

The photolumineseent (PL) and eleetroluminescent (EL) properties of a series of ligand emitting rare earth complexes (including y^3 , La^3 , Gd^3 and Lu^3 ) were systematically studied. These complexes have the same anionic ligand, 1-phenyt-3-methyl-4-isobutyryl-5-pyrazoloneate (PMIP), and three neutral ligands, triphenyl phosphine oxide(TPPO), 2, 2‘-dipyridine (Bipy) and phenanthroline (Phen). Measured with 60 nm thin film of these complexes vaporized in vacuum on quartz substrates, a good regularity in the PL properties was observed. For rational comparison, the same structural EL devices based on these complexes, ITO/PVK (40 nm)/the complex (80 nm)/Mg: Ag (200 nm)/Ag (100 nm), were fabricated. Excluding the exeiplex emission happens, the EL luminance usually increases with the increasing of PL efficiency.     

Novel phosphors of Eu^3＋, Tb^3＋ or Tm^3＋ activated LaBGeO5

Rare earth borogermanates as a group of stable compounds provided various potential properties important for modern sciences. Among the properties of interests, luminescence was manifested due to the variability of rare earth elements and the compounds constituted an important group of potential candidate. In this work, novel phosphors of Eu³⁺, Tb³⁺ or Tm³⁺ doped LaBGeO₅ with the stillwellite type structure were synthesized by the solid state reaction method. Their X-ray and UV excitation luminescent properties showed that LaBGeO₅ was an excellent host lattice for the luminescence of Eu³⁺, Tb³⁺ and Tm³⁺. The LaBGeO₅:Eu³⁺, LaBGeO₅:Tb³⁺ and LaBGeO₅:Tm³⁺ presented bright red, green and blue emission light for both UV and X-ray excitation.     

Hibernate＋JSF＋Ajax在炼铁厂车间网站中的应用

为了促进炼铁厂车间管理,提高生产水平,采用J2EE框架技术设计了一个车间网站系统。车间网站用Hi-bemate实现持久层,用JSF实现业务逻辑层和表现层,利用JSF和Ajax技术的结合,实现了高效的轻量级的J2EEWeb开发应用架构,依靠JSF的组件和事件驱动模型,加上Ajax的异步通讯方式,为车间网站营造一个体验好,界面友好的应用环境。     

Quenching mechanism of Er^3＋ emissions in Er^3＋-and Er^3＋/Yb^3＋-doped SrAl12O19 nanophosphors

Nanoscaled SrAl12O19:Er3+ and SrAl12O19:Yb3+,Er3+ phosphors were synthesized by a combustion method.The emission intensities of every sample were compared by a new method with the emission of codoped Gd3+ ions as a reference.Compared with their bulk material prepared by the solid-state reaction method,a higher Er3+ quenching concentration,as high as 20%,was observed in the nanoscaled phosphors for both visible(VIS) and near infrared(NIR) emissions.The higher quenching concentration in both VIS and NIR regions for nanoscaled samples are related to the structure characteristics of the nano particles.The influence of the introduction of Yb3+ ions on the emission spectra intensity was also investigated and discussed.     

S／SJ2钢“EF＋LF＋VOD＋电渣”新工艺的试制

S／SJ2钢的生产一直采用“电炉＋电渣”炼钢工艺，在2005年该钢有大批炉号在纯洁度检验时不舍。于2006年采用“EF＋LF＋VOD＋电渣”冶炼工艺成功试制了一批S／SJ2钢，与原工艺在性能、纯洁度方面进行了对比，证明“EF＋LF＋VOD＋电渣”新工艺是完全可行的。     

地面水环评模式软件的C＋＋编程设计与实现

介绍了地面水环境影响评价模型软件的理论基础、设计思想和实现方法,利用Borland C＋＋ Bilder语言编制专门处理导则-河流模式的数据计算的应用程序,使得环评导则-河流模式的预测计算能够借助计算机快速准确地完成.     

EF＋LF／VD＋CC生产轴承钢的实践

在新建的大电炉-连铸生产线上开发了方坯连铸轴承钢工艺技术，提高了轴承钢的清洁度，并使连铸轴承钢的接触疲劳寿命和轴承疲劳寿命分别达到和超过了模铸轴承钢。