现代锡磷青铜带材生产工艺与技术

锡磷青铜带是当前应用最广泛的铜合金弹性材料。电子、通讯和汽车行业的高速发展，接插件、连接器用的锡磷青铜带材需用量剧增，质量上要求高精度、高表面、优良的板型和严格的性能值。该文就现代锡磷青铜带材生产的熔炼与铸造、退火、轧制、清洗、矫平、剪切等工艺与技术作一介绍。     

Characterization of (Y,Gd) BxV1-xO4-x:Eu Phosphor Prepared by Coprecipitation Reaction

White body-color (Y, Gd)BxV1- xO4-x :Eu3 phosphors were prepared by coprecipitation reaction. Under VUV excitation at 147 nm, the red emission colorimetric purity of (Y, Gd)BxV1- xO4-x :Eu3 phosphor is much better than that of commercial PDP (plasma display panels) phosphor (Y, Gd)BO3:Eu3 . But its relative emission intensity is only about 90% of the commercial phosphor.     

Sol-Gel Synthesis and Luminescent Characteristic of Doped Eu^3 ＋ Silicate-Silica Phosphor

Silicagelphosphorsdopedrareearthionshave attractedgreatattentionofmanyresearchersdueto theseadvantages,suchashighersamplehomogeneity,purityandstable,efficientandenvironmentallyfriend lyphotoluminescencematrixmaterials,whichisless toxicleadtonetconversione…     

American = White?

Six studies investigated the extent to which American ethnic groups (African, Asian, and White) are associated with the category "American." Although strong explicit commitments to egalitarian principles were expressed in Study 1, Studies 2-6 consistently revealed that both African and Asian Americans as groups are less associated with the national category "American" than are White Americans. Under some circumstances, a dissociation between mean levels of explicit beliefs and implicit responses emerged such that an ethnic minority was explicitly regarded to be more American than were White Americans, but implicit measures showed the reverse pattern (Studies 3 and 4). In addition, Asian American participants themselves showed the American = White effect, although African Americans did not (Study 5). The American = White association was positively correlated with the strength of national identity in White Americans. Together, these studies provide evidence that to be American is implicitly synonymous with being White. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

电感耦合等离子体质谱法测定钽粉中的磷

介绍了采用电感耦合等离子体质谱法（ICP—MS）对钽粉中微量杂质磷进行测定的方法。通过使用耐氢氟酸的惰性进样系统、屏蔽炬（shned torch）和冷等离子体技术，以及对测试条件的探讨，成功地运用标准加入法测量了金属钽粉中微量磷的含量。     

白口铸铁的磨料磨损行为及耐磨性

通过白口铸铁的耐磨试验，观察分析材料的磨面和磨屑；研究不同性能的白口铸铁在磨料磨损时的行为机理．     

一个采用Client/Server方式基于WWW 的多用户交流讨论系统

文章介绍了一种采有Ｃｌｉｅｎｔ／Ｓｅｒｖｅｒ方式工作的基于ＷＷＷ的多用户交流讨论系统，它比一般的基于Ｔｅｌｎｅｔ方式的ＢＢＳ，具有通讯效率高，媒体介质丰富，用户界面善等特点，更适合于Ｉｎｔｅｒｎｅｔ上交流。     

基于静态小波分解的多尺度机加工表面图像滤波

由于在机械加工过程中机械振动和噪声回波的相干性，机加工表面图像上会存在白噪声，为了削弱这些噪声的影响。提出了一种基于静态小波分解的自适应阈值滤波方法，该方法首先将机加工图像分解至静态小波域，然后在静态小波域中将噪声的小波系数收缩至零，将此基于Mallat的静态分解滤波算法应用于机加工图像白噪声滤波，并与另外三种典型图像滤波算法进行比较，结果表明，该方法不仅可以有效的去除噪声，而且还可以保持图像的精密纹理结构。     

一种应用于博物馆文物展示的LED照明系统

白色发光二极管的诸多优点使其在照明领域的应用越来越广泛,将成为继白炽灯、荧光灯和气体放电灯之后新一代的光源,二十一世纪将进入以LED为代表的固体光源照明时代.尤其在博物馆文物展示照明中,白色LED光源照明的优势更显见.一般的荧光灯或者金属卤化物灯的紫外辐射会对博物馆文物造成不同程度的老化和损害,本文提出了一种应用白色LED环形光源的照明系统,使得这种损害大大降低,在博物馆文物展示中实现了绿色照明.本文给出了该系统的光学设计和理论模型,通过计算机编程得到相应的反射镜面曲线方程参数,并在光学软件(ASAP)中模拟出几何模型,进行光线追迹和数据分析,理论上证实此系统的可行性.