Towards an effective and adequately verifiable PPWT

The 2008 Russia–China proposal to the Conference on Disarmament on preventing space weapons has attracted wide attention. Lengthy debates have been made on the need for such a treaty and for two of its most disputed elements, namely prohibition of ground-based anti-satellite weapons and verification. This article argues that, regardless of verifiability, such a treaty is urgently needed for the benefit of international peace and security, and for the security interests of spacefaring countries. But in order to serve these purposes effectively, the treaty should at least explicitly prohibit testing, deployment and use of space-based weapons and ground-based anti-satellite weapons. Given the necessary political will, it is feasible to “adequately verify” these constraints. The verification regime should permit the incorporation of new measures in the future, combine international technical means and national technical means, combine remote-sensing technologies and on-site inspections, and be complemented by transparency and confidence-building measures.     

冗余技术在捷联惯导系统中的应用研究

在简要介绍冗余技术的基本概念和发展状况的基础上，指出了目前飞行器控制系统存在的主要问题，并将冗余技术引入捷联惯导系统，使捷联惯导系统可靠性迅速提高，同时获得了大量重复测量数据。最后给出了工程应用实例，并探讨了进行冗余设计时需要注意的几个问题。     

Seasonal variability of GPS-VTEC and model during low solar activity period (2006–2007) near the equatorial ionization anomaly crest location in Chinese zone

Variability of vertical TEC recorded at Fuzhou (26.1°N, 119.3°E, geomagnetic latitude 14.4°N), Xiamen (24.5°N, 118.1°E, geomagnetic latitude 13.2°N), Nanning (22.8°N, 108.3°E, geomagnetic latitude 11.4°N), China, during the low solar activity in 2006–2007 have been analyzed and discussed. Remarkable seasonal anomaly was found over three stations with the highest value during spring and the lowest value during summer. The relative standard deviation of VTEC is over 20% all the time, with steady and smooth variation during daytime while it has a large fluctuation during nighttime. The biggest correlation coefficient was found in the VTEC-sunspot pair with a value of over 0.5. It seems that solar activity has a better correlation ship than geomagnetic activity with the variation of VTEC and better correlations are found with more long-term data when comparing our previous study. The results of comparing observation with model prediction in three sites reveal again that the SPIM model overestimates the measured VTEC in the low latitude area.     

CFZ0.4D型家用除湿机毛细管结构参数的确定

小型制冷系统的节流装置通常采用毛细管。它具有平衡较快、结构简单、成本低、质量稳定等特点。论文对CFZ0.4D型家用除湿机制冷系统中的节流装置——毛细管进行了实验研究,得出了符合设备性能要求的毛细管最佳参数值。     

基于模糊关系模型的电火花加工工艺数据库

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我心目中的空管人

空管,我并不陌生,甚至曾经走得很近。空管,也曾是我为之努力的理想。本科四年,在飞行学院学的正是空中交通管制,而且还是该校的第一届“。右转30度”“爬升至9000米报告”,面对模拟机上密密麻麻的飞机,一条条指令由我们口中发出,那是一种自豪,那更是一种责任。模拟机训练构建了     

漂亮的军火出口成绩单 2004年俄罗斯军火销售的绩效评析

在政府的积极推动下．俄罗斯2004年的军火销售再度取得55亿美元的亮丽成绩，销售的种类和层次不仅已有所提升，在北非和阿拉伯半岛的军火市场亦有所突破。不过俄国军火企业的基本问题倘无法获得解决，对其未来发展恐怕会有相当影响，非常值得注意。     

《管理学》案例教学改革思路

论述案例教学改革的意义,分析陕西科技大学《管理学》案例教学实施中存在的问题,提出《管理学》案例教学改革的思路。     

改装双三角翼对歼击机升阻特性的影响

本文通过理论分析和风洞试验，研究改装双三角翼对飞机动性能的影响。所得结果对飞机设计，特别是改型设计有一定实用价值。