High speed driving of a gain-switched laser diode with anexponential transmission line

With the increase of information capacity of an airborne system, high speed driving of laser diodes have been of interest. In order to match the low resistive LD, proposed in this paper is an exponential transmission line, which is used as preshaping to compensate the pattern effect in gain switching of laser diodes. It also will be used to overcome the effect of parasitic elements in high speed driving to improve the rise and trail edges of the output waveform. An accurate circuit model of the exponential line for the PSPICE program has been developed and simulations are conveniently carried out by employing PSPICE     

侧链含硝基氮杂基团的聚醚粘合剂的性能及应用──新型硝基粘合剂研究Ⅲ

对新型的侧链含硝基氨杂基因的富能聚醚粘合剂──端羟基２─甲硝胺基乙基缩水甘油醚均聚醚（ＮＰＥ—Ａ）和端羟基共聚醚（ＮＰＥ—Ｂ）的性能进行了研究。结果表明，ＮＰＥ的热稳定性和化学稳定性良好，优于普通碳氢聚醚粘合剂（ＨＣＰＥ）和新型氟碳聚醚粘合剂（ＦＣＰＥ）；其固化后的力学性能良好。简要地叙述了以ＮＰＥ—Ｂ为粘合剂的固体火箭推进剂的配方和性能。     

激励控制:国有商业银行内部人控制问题的解决途径

内部人控制问题是现阶段我国国有商业银行面临的主要问题之一,它直接影响了我国国有商业银行的贷款质量,从而间接影响了我国的金融改革进度.揭示了为何要对银行高级管理人员实施激励控制,提出了根据相时业绩评估高级管理人员的管理业绩,并以此建立激励报酬的模式.认为采用激励控制的模式是改善国有银行内部人控制问题的有效途径.     

WIOBSS: The Chinese low-power digital ionosonde for ionospheric backscattering detection

The ionospheric laboratory of Wuhan University has developed an ionosonde over about seven years. The prototype is designed as a portable, low-power digital MF (medium frequency) and HF (high frequency) radio system with high range and Doppler resolution. The first system is used for ionospheric oblique backscattering detection and called WIOBSS (Wuhan Ionospheric Oblique Backscattering Sounding System). WIOBSS is a portable monostatic ionosonde for both ionospheric research and HF channel management, adopting alternate transmitting and receiving patterns to transmit long coded pulse trains for high pulse compression gain. The almost perfect sequences are applied to modulate the pulse train for sounding without range sidelobes and the echo phase is used to estimate the Doppler velocity and velocity fluctuation. This paper introduces the new techniques adopted by WIOBSS and presents some observations.     

光敏元件与光传感器的市场动态和发展

介绍了光敏元件与光传感器技术的发展及在国民经济和军事领域中的重要怍用;分析了国内外光电子产业的市场动态与发展趋势;论述了我国光电子产业面临的机遇和挑战。     

开放式网络化测控系统中的同步控制技术

现代测控系统的测量对象越来越复杂、越来越分散,信号采集和控制终端节点呈现开放式、网络化分布式发展趋势.     

微重力科学与应用研究（上）

空间微重力环境的独特物理现象对航天器各系统均产生无法回避的影响,在型号研制中正确计入微重力效应是航天事业发展中的一个重要研究领域。在现阶段,航天器发动机再启动相关的微重力研究以及载人航天防火安全相关的微重力研究应当引起人们的高度重视。随航天事业的发展,微重力效应问题日益会严重起来（结构动力学、耦合动力学、多相流温控、低重星球场着陆撞击……）,进行深入广泛的微重力效应研究对保证航天器飞行任务完成有着不应忽视的作用     

冷冲压模具的维护及要点

阐述了模具维护的由来和重要性,介绍了模具维护的各个方面和要点,以及针对模具各类零件的分析和相关的维护措施。