非致命武器--温柔的"杀手"

冷战结束后，低强度冲突、恐怖事件、贩毒活动频频发生，给世界带来的不安并不亚于战争。对付上述情况，强杀伤性武器如飞机、坦克、大炮、机枪等往往派不上用场，而非致命性的软杀伤武器却大有用武之地。因此，世界许多国家都积极开展非致命性武器的研充工作，使非致命性武器（也叫失能武器）异军突起。目前，世界上已经研制成功和正在研制的非致命武器功能各异，失能机理和作用对象也各不相同，比较典型的有：化学失能剂、刺激剂、幻觉武器、次声波武器、低能激光致盲武器、全向照射武器等。[编者按]     

高铁混合垢化学清洗技术

作者研制了高铁混合垢的化学清洗配方及工艺,经生产应用收到了良好效果,除垢率及缓蚀率均超过劳动部标准和水利电力部标准.     

Au吸附在GaAs（110表面的研究

研究了Au吸附在GaAs(110)表面的吸附构型,并计算了表面态密度和表面能带结构.计算结果表明,可以认定Au与Ga的悬挂键杂化成键,从而引起2条附加的能带,一条位于禁带之中,距价带顶为0.9ev;另一条与价带共振,离价带顶为0.7ev,所得结果与实验结果相一致.     

希多夫法测定离子迁移数的改进

本文介绍对希多夫法测定离子迁移数实验方法的改进。新方法在节约实验经费,简化操作步骤提高实验结果的重现性诸方面取得了良好的效果。     

化学防除苗圃天仙子试验初报

在运用不同药剂、剂量对苗圃地杂草天仙子进行化学防除试验的基础上。分析了各试验药剂的化学除草效果。试验结果表明，采用10％草甘膦与72％2，4-D丁脂(配比5：5)的混合剂，防除针叶树苗圃地天仙子效果最佳；防除时间上在5～6月份。应用草甘膦防除天仙子是最适时期。化学防除天仙子平均每666．7m^2可节约劳动力投入3．5～3．8个工日。资金41—47元。     

哈佛大学研制新型纳米光纤

据2003年12月3日英国《新科学家》报道:一种用于光学计算机和化学传感器的新型纳米光纤有望不久问世。光纤是利用有涂层的内芯传导光线的。这种新型光纤使用超细的二氧化硅做内芯,而用空气充当涂层。光纤内芯的材料表面必须做到十分光滑,与空气之间有一致的界面,因为粗糙的界面会使光波分散。为了确保表面光洁度合格,哈佛大学的埃里克·玛祖用一个炽热的蓝宝石椎体熔化二氧化硅,然后把它拉长。埃里克说,这种内芯的光滑程度已接近原子水平。他已制作出50纳米细的纤维。这种纤维的直径不到标准纤维的1/2000。光纤越细,沿着它表面通过的光波就…     

Monitoring the sandstorm during spring season 2002 and desertification in northern China using SSM/I data and Getis statistics

A massive sandstorm enveloped most part of northern China during the spring season 2002. Monitoring the evolution of sandstorm and desertification has become one of the most serious problems for China's environment. Since 1989, one of the most advanced and operational passive microwave sensors is the DMSP SSM/I (special sensor microwave imager) operated at seven channels (19, 37, 85 GHz with the vertical and horizontal polarization and 22 GHz with vertical polarization only). In this paper, the sandstorm and desertification indexes, SDI and DI, are derived from the radiative transfer equation, and are employed with multi-channel measurements of the DMSP SSM/I for monitoring the sandstorm and desertification in northern China. Some SSM/I data in 1997 and 2001 are employed. The algorithm of Getis statistics is developed to categorize the spatial correlation and its evolution these days. It is demonstrated that the SSM/I indexes, SDI and DI, and its Getis statistics are well applicable for monitoring the sandstorm and desertification.     

Parity Nonconservation in of Multiply Dielectronic Recombination Charged Ions

A parity nonconserving （PNC） asymmetry in the cross section for dielectronic recombination of polarized electrons on multiply charged ions with Z≥40 is discussed. This effect is strongly enhanced for close doubly-excited states of opposite parity in the intermediate compound ion. Such states are known for He-like ions. However, these levels have large energy and large radiative widths which hampers observation of the PNC asymmetry. We argue that accidentally degenerate states of more complex ions may be more suitable for the coresponding experiment.