Performance and observation summary of Changchun Satellite Laser Ranging Station

This note introduces the performance and observation summary of the SLR system at Changcun Observatory, the Chinese Academy of Sciences. The performance of the SLR system has been greatly improved since August 1997. The single shot precision is improved from 5–7 cm to 1–2 cm and the normal point precision reaches 4–7 mm. The long-term stability is better than 1 cm. The amount of observation has been increased from 1000 to over 3000 passes. The whole performance of Changcun SLR system has reached the advanced level among the worldwide SLR stations.     

Research on the magnetic material of Sm-Fe matrix nitrides

In this paper, the types of Sm-Fe matrix compounds and their correlations are introduced, and progress of research on the magnetic materials of Sm-Fe matrix nitrides is also reviewed. Possible research trends of future permanent magnetic materials of SmFe matrix nitrides are briefly predicted.     

北半球斜上抛体的运动方程

给出了同时考虑地球自转和空气阻力两种影响并当空气阻力与抛体速度的一次方成正比时北半球斜上抛体运动方程的精确解。     

Simultaneous Multithreading Fau Tolerance Processor

Transient fault detection mechanism is added to simultaneous muhithreading architecture. By exploiting both ILP (Instruction l~evel Parallelism) and TLP (Thread Level Parallelism), Simultaneous Multithreading(SMT) Fault Tolerance Processor can be expected to achieve better tradeoff between performance and hardware cost than traditional Fault Tolerance Processors. Detailed simulations of 3 of SPEC95 benchmarks show that executing two redundant programs on the fault-tolerant microarchitecture takes only 40%-61% longer than running a single version of the program. The new instruction fetch algorithm enhances the performance by 0. 4%～1% to most of the benchmarks we choose randomly.     

Initiating, growing and cracking of hydrogen blisters

The growing process of a hydrogen blister in a wheel steel was observed in situ with an optical microscope, and the fracture surfaces formed from broken blisters on a wheel steel and bulk metallic glass were investigated. The initiating, growing, cracking and breaking of hydrogen blisters are as follows. Supersaturated vacancies can increase greatly during charging and gather together into a vacancy cluster （small cavity）. Hydrogen atoms become hydrogen molecules in the vacancy cluster and hydrogen molecules can stabilize the vacancy cluster. The small cavity becomes the nucleus of hydrogen blister. The blister will grow with entering of vacancies and hydrogen atoms. With increasing hydrogen pressure, plastic deformation occurs first, the hydrogen blister near the surface extrudes, and then cracks initiate along the wall of the blister with further increasing hydrogen pressure. A cracked blister can grow further through propagating of cracks until it breaks.     

Synthesis, characterization and properties of diamidodisilanes and azocyclosilane

Organosilicon compounds have been widely researched and have the maximum species besides hydrocarbons. In the progress of the research work, many scientists pay attention to the organic silicon compounds that have vari-ety reactive functional groups[1,2]. The difunctional disi-lanes are very active; they could react with not only the compounds containing reactive hydrogen atoms, but also the reactive polymers. Therefore, the disilanes with di-functional groups could be used as disilane substit…     

Mg（OH）2过滤性能优化研究

研究了Mg(OH)2制备过程中投料时间、加入晶种量、反应温度对其过滤性能的影响,得出了改善Mg(OH)2过滤性能的最佳反应条件.     

PES/SPES共混平板复合膜的制备及性能表征

采用浸没沉淀相转化法制备了聚醚砜/磺化聚醚砜（PES/SPES）共混平板复合膜,并对其进行性能表征.铸膜液配比对膜性能有较大的影响：聚合物浓度增大,膜孔径变小、膜厚增大、水通量变小;PVP的添加能有效改善复合膜的亲水性,膜的接触角随PVP含量增大而减小;膜的水通量随铸膜液中PVP含量的增大先增大后减小,当PVP含量为6%时,水通量达到最大值;接触角随共混聚合物中SPES含量的增大而减小,且随聚合物组份中SPES含量的增加,水通量先逐渐增加,并在质量配比为PES/SPES（8：2）时达到最大值,随后水通量逐渐下降.     

生物带-膜生物反应器脱氮除磷效果

在传统的一体式膜生物反应器（SMBR）中安装生物带将其改造成生物带-膜生物反应器（BMBR），BMBR所需启动时间较短，在运行5d后出水水质基本稳定．生物带上丰富的生物相、较强的吸附能力及所形成的厌氧-好氧交替微环境，导致出水水质较SMBR有所提高，COD、NH3-N、TN的去除效率分别由SMBR的81％、81％、30．1％提高至95％、88％、76％．但是由于剩余污泥零排放的运行方式，导致BMBR对TP的去除效果较差，在33％～37．5％之间．     

基于VRML场景的网上虚拟配画环境设计

介绍了在一个电子商务网站中,如何运用asp(服务器端的脚本语言)、JavaScript(脚本编程语言)和VRML(虚拟现实建模语言)与数据库互联,实现装饰画的网上自主配画和订购。特别是用户可以上传自己家的照片,在网上可以预览装饰画放在自己家中的效果。该文提出了采用分层图像和透明处理的方法解决了遮挡问题,采用ASP与VRML结合的方法解决了虚拟场景与数据库的连接。