全自动数字化任意辊型磨削的改造和开发

冷轧厂轧辊磨床是从美国FARREL公司引进,其电气控制系统采用八十年代初最新技术。本文着重讨论了原设计中砂轮进给系统的缺陷及解决办法,详细阐述了全自动数字化任意辊型磨削原理及实施方法。对于现有旧磨床的改造具有参考价值。     

宝钢1420冷轧机中5/4机架间张力超调原因及对策

宝钢1420冷轧机在轧制汽车板时,5/4机架间经常发生张力超调,张力超调下轧制的带钢占40%以上.造成该张力超调的主要原因是5/4机架间的张力环存在缺陷和4机架中工作辊与中间辊间出现打滑.文章提出了解决张力超调的方法和措施,在实际生产中实施后,处在张力超调下轧制的带钢量从40%以上减少到2%左右.     

宝钢1550连退机组的三电系统设计

宝钢三期冷轧 15 5 0连续退火机组的工艺和装备均具有世界一流水平 ,其三电控制系统主要采用日本三菱电气公司的最新产品构成。这里重点阐述三电系统设计中采用的多层次网络技术、分布式集散系统及EIC一体化等最新技术。     

发光二极管用荧光材料Sr2CeO4:Sm3+的合成及其发光特性

以具有一维结构的Sr2CeO4化合物为研究对象、Sm3 作为发光中心,探索了其作为LED用荧光材料的可能性.用高温固相法于1200℃、6h合成了Sr2CeO4:Sm3 系列单相粉末样品,并研究了其发光性质.结果表明,在365nm激发下,从荧光光谱中可以看出存在从基质向稀土离子的能量转移.通过调节荧光材料Sr2CeO4:Sm3 中稀土离子Sm3 的掺杂浓度,可以调谐发光体的发光颜色,当Sm3 离子浓度较小(<3%)时,体系发出很强的白光;当Sm3 离子浓度较大(3%～15%)时,体系发出红光.测量了荧光材料的色坐标,发现Sr2CeO4:1%Sm3 的色坐标是(0.334,0.320),接近于纯白色(0.33,0.33),可以作为一种新型的UV-LED用单一白色荧光材料.     

Preparation and characterization of BaMgAl10O17：Eu phosphor coated with MgFz by sol-gel process

In order to prevent BaMgAl10O17: Eu (BAM) phosphor from thermal degradation, MgF2-coatings on the surface of BAM were prepared by a sol-gel process. The coatings were characterized by X-ray photoelectron spectroscopy and scanning electron microscopy. The results indicate that BAM is successfully coated with homogenous, close MgF2 coatings. The photoluminescence and anti-thermal degradation properties of coated BAM were investigated under 254 and 147 nm excitations. The optimum anti-thermal degradation properties are obtained at the mass ratio of MgF2 to BAM 0. 2% under 254 nm excitation and 0. 5% under 147 nm excitation, respectively. It is considered that trace MgO formed after baked would cause different optimum coating thicknesses under 254 and 147 nm excitations.     

水泥联合粉磨系统隔仓板的改造

双层筛分隔仓板不适用于由辊压机和V型选粉机组成的闭路预粉磨及其与φ4.2 m×13 m中心传动的球磨机开路粉磨组成的联合粉磨系统,如果换成单层式、出料篦缝呈中心放射状分布的隔仓板后,水泥粉磨系统的效能得到提升.     

Synthesis and photoluminescence properties of a red emitting phosphor NaSr2（NbO3）5：RE3＋（RE=Sm,Pr） for white LEDs

Rare earth Sm3＋, Pr3＋doped NaSr2（NbO3）5 red phosphors were successfully synthesized. X-ray diffraction analysis indi-cated that all the samples were single phased. The luminescence property was investigated in detail by diffuse-reflectance spectra and photoluminescence spectra measurement. Both NaSr2（NbO3）5：Sm3＋and NaSr2（NbO3）5：Pr3＋phosphors showed strong absorption in near ultraviolet region, which was suitable for application in LEDs. When excited by UV light, they both emitted bright red emission with CIE chromaticity coordinates （0.603, 0.397） and （0.669, 0.330）, respectively. The optimal doping concentration of Sm3＋doped NaSr2（NbO3）5 was measured to be 0.04 and that for Pr3＋doped NaSr2（NbO3）5 was 0.01. The integral emission intensity was also measured and compared with the commercial red phosphor Y2O3：Eu3＋. The results indicated that NaSr2（NbO3）5：RE3＋（RE=Sm, Pr） have potential to serve as a red phosphor for UV pumped white LEDs.     

跨境贸易人民币试点对有色进出口影响

国务院常务会议决定，将在上海、广州、深圳、珠海、东莞5城市开展跨境贸易人民币结算试点，这意味着人民币实现了在国外担当计价和结算工具的重要跨越。这一消息对从事有色金属进出口贸易的企业和贸易本身而言，无疑是一重大利好，甚至可以说影响深远。     

连续机组中的物料跟踪与实现方法

在连续生产机组中，材料跟踪是设定值的设定和实际值收集的基础，当新的带钢进入某工艺设备时，控制设定值需要作用应变动，为了能使工艺设备在正确时刻切换控制设定值，就必须依靠正确的材料跟踪。文章介绍宝钢针对1550连续退火机组而开发的一种材料跟踪原理，目前已在该机组上得到成功应用并获得良好效果。     

Recent development in rare earth doped phosphors for white light emitting diodes

As new light sources for next-generation illumination, white light-emitting diodes(WLEDs) have been extensively developed and are commercially available due to their excellent advantages, such as high efficiency, energy-saving, compactness, long operational lifetime and environmental friendliness. Currently, WLEDs with high color rendering are mainly based on wavelength conversion by one or more phosphor materials. In this review, the recent developments of phosphors for WLEDs were introduced combined with the relative work of our group. The common methods for generating white light for blue/ultraviolet(UV) WLEDs were summarized, including:(1) optimizing the commercially used phosphors;(2) developing some new phosphors based on UV LEDs chips;(3) realizing white light emission based on single host. Moreover, some typical new developed phosphors and their luminescence properties were introduced.