2003 International Powder／Bulk Conference ＆ Exhibition

Hosted by the Chinese Society of Particuology, China Powder Industry Association and Shanghai Science Technology Exhibition Company, with the sponsorship of Trans Tech Publications, Germany, and the organization of Worldwide Exhi-bitions Service Company, the above Conference/Exhibition, the largest of its kind in China, was held from Nov. 29 to Dec. 1 in Shanghai Mart, Shanghai. More than 100 professional equipment producers and market promotion agencies in powder/bulk handling and p…     

C60量子点与磁性电极的耦合

在磁电子学领域，自旋极化输运与分子器件的结合是一个热门研究方向．最近，来自美国康奈尔大学的Pasupathy等，采用纳米加工技术，将单个C60分子吸附在一对Ni电极之间，构成了“铁磁电极-C60量子点”器件．量子点的Kondo效应和铁磁性交换耦合，原本是相互排斥的，在Pasupathy的实验中，两者被首次结合在一个器件中并加以观察．研究结果表明，如果器件的质量能够保证两种效应之间的竞争得到有效控制，     

工科数学教学中数学建模技术的嵌入式教学法

本介绍了在工科数学教育中引入数学建模技术的教学方法，教学组织及教学案例，是多年工科数学教学的经验总结。     

用电泳技术制备YBCO高温超导厚膜

介绍了电泳技术制备YBCO高温超导厚膜的实验方法和YBCO高温超导厚膜的电学性质测量 ,讨论了在学生小型科研实验或设计实验中开展此实验的学时安排、注意事项和实验内容的扩展 .     

Damage and fracture evaluation of granular composite materials by digital image correlation method

This paper presents the applications of digital image correlation technique to the mesoscopic damage and fracture study of some granular based composite materials including steelfiber reinforced concrete, sandstone and crystal-polymer composite. The deformation fields of the composite materials resulted from stress localization were obtained by the correlation computation of the surface images with loading steps and thus the related damage prediction and fracture parameters were evaluated. The correlation searching could be performed either directly based on the gray levels of the digital images or from the wavelet transform (WT) coefficients of the transform spectrum. The latter was developed by the authors and showed higher resolution and sensitivity to the singularity detection. Because the displacement components came from the rough surfaces of the composite materials without any coats of gratings or fringes of optical interferometry, both surface profiles and the deformation fields of the composites were visualized which was helpful to compare each other to analyze the damage of those heterogeneous materials. The project supported by the National Natural Science Foundation of China (10125211 and 10072002), the Scientific Committee of Yunnan Province for the Program of Steel Fiber Reinforced Concrete, and the Institute of Chemical Materials, CAEP at Mianyang     

2003年的诺贝尔物理奖

2003年的诺贝尔物理奖授予了低温物理领域的三位物理学家，他们是Alexei A、Abrikosov(阿布里柯索夫)，Vitaly L．Ginzburg(京茨堡)以及Anthony J．Leggett(莱格特),此奖用以表彰前两者在超导电性方面的贡献，后者为在超流方面作出的贡献.大家知道，自然界中的微观粒子服从量子力学规律；     

“2003年水声综合技术交流会”将于8月在四川雅安市召开

与时俱进、三阳开泰,我们迎来了2003年。在新的一年内水声行业为我国海军水声装备现代化建设担负着光荣的历史使命,同时要承前启后,鼓励和培养青年水声科技工作者尽快成才,挑起水声科学赶上和超过世界先进水平的重任。为此,中国造船工程学会船舶仪器仪表学术委员会、中国仪器仪表学会船舶仪器仪表分会、中国造船工程学会电子学术委员会水中探测学组、中国国防网站联合会水声专业网等学术团体联合召开“2003年水声综合技术交流会”,为我国水声科技工作者提供一个交流科研创新、科研攻关和科研新成果的学术舞台,热忱欢迎水声科技人员特别是     

Fe0.5Cu0.5BaSrYCu2Oy化合物的结构和超导电性研究

实验采用常压和高压分别制备出含铁的FexCu1-xBaSrYCu2Oy（x= 0～1）系列化合物，本文主要研究x=0.5时样品的结构和超导电性.测量结果显示，高压合成的样品均具有超导电性，对于x=0.5的样品超导转变温度Tc(onset)～57K， Tc(0)～40K，而常压合成的样品当Fe含量x>0.3时均不超导.为此，我们利用透射电子显微镜（TEM）研究了该体系的微观结构特性，并通过电子能量损失谱(EELS)揭示出高压合成导致样品中载流子浓度明显高于常压样品，证明样品制备过程中高压有利于超导电性的形成.同时对高压样品中的缺陷和局域晶体结构畸变进行了深入分析.     

Excited Stated in ^207Rn

Excited states ^207Rn are investigated via the^196Pt(^16O,Sn)^207 Rn reaction at beam energies from 85 to 95 MeV using techniques of in-beam γ-ray spectroscopy.Measurements of γ-ray excitation function,x-γ and γ-γ-t conincidences are performed with ten BGO(AC) HPGe detectors.Based on these measurements,a level scheme of ^207Rn,including 17 γ-rays and 18 levels,is established.Spins for most of the levels are proposed according to the measured DCO ratios.The level struccture is compared with a weak-coupling calculation using the interaction energies extracted from neighbouring nuclei.