从31．5秒所想到的——论现阶段民航空管设备运行风险及防范

民航空管部门是直接保障飞行的，而空管设备则是空管部门有效开展工作、保障飞行安全重要的物质基础，这就需要确保设备的完好率与正常运行。然而，任何设备在单机运行条件下是不会达到100％的设备正常率的，况且这几年空管系统引进的很多设备存在型号杂、不兼容的问题，缺乏可靠性；部分地区的设备老化现象严重，故障率较高。在这种情况下，本文作者提出“从31．5秒所想到的——论现阶段民航空管设备运行风险及防范”的命题，并从五个方面提出了解决的办法，是很有针对性的，应当引起空管全系统、特别是空管设备保障部门的深思与重视。     

水平轴风轮空气动力性能的分析计算

本文用半刚性尾流模型近似表示给出水平轴风轮空气动力性能的分析计算方法。在高尖速比范围内，本方法给出的结果比动量理论给出的更加接加接近实验数据。     

航天测量船试验文书标准化模式研究

在分析航天测量船试验文书现状的基础上,从标准化要求出发,提出航天测量船试验文书两级两类四综合标准化模式及其基本框架和实现途径。     

Performance of a simple Closed Aquatic Ecosystem (CAES) in space.

A simple Closed Aquatic Ecosystem (CAES) consisting of single-celled green algae (Chlorella pyrenoidosa, producer), a spiral snail (Bulinus australianus, consumer) and a data acquisition and control unit was flown on the Chinese Spacecraft SHENZHOU-II in January 2001 for 7 days. In order to study the effect of microgravity on the operation of CAES, a 1 g centrifuge reference group in space, a ground 1 g reference group and a ground 1 g centrifuge reference group (1.4 g group) were run concurrently. Real-time data about algae biomass (calculated from transmission light intensity), temperature, light and centrifugation of the CAES were logged at minute intervals. It was found that algae biomass of both the microgravity group and the ground 1 g-centrifuge reference group (1.4 g) fluctuated during the experiment, but the algae biomass of the 1 g centrifuge reference group in space and the ground 1 g reference group increased during the experiment. The results may be attributable to influences of microgravity and 1.4 g gravity on the algae and snails metabolisms. Microgravity is the main factor to affect the operation of CAES in space and the contribution of microgravity to the effect was also estimated. These data may be valuable for the establishment of a complex CELSS in the future.     

双CPU环境下飞行控制软件的设计

本文介绍运载火箭飞行控制软件在双ＣＰＵ冗余硬件配置下的可靠性设计和可靠性指标分配的方法。文中提到的部分技术经过了实验的检验，证明是可行的     

长盛不衰 百年犹荣--一个颇具盛名的标准化团体ASTM

回顾了ＡＳＴＭ的建立过程，该机构目前已有３００００多个国内外会员，１３１个技术委员会，每年都出版标准年鉴，标准被世界各国广泛采用，与美国国防部标准化部门及其他标准化机构有广泛的联系，活动经费主要依靠出售标准和提供标准化服务的收入。     

基于ADS仿真的锁相环设计与实现

文章利用MAX2620构造宽带可调VCO并用ADS建模进行参数优化，在此基础上与MB15E03频率合成芯片构造锁相环，并利用ADS对暂态响应和相位噪声性能进行分析，在仿真分析的基础上建立实际的锁相环电路。     

A tentative statistical analysis of flare events observed by NoRH and NoRP

In this paper, we report the statistical analysis of flare events observed by NoRH during 1992–2005 and NoRP during 1994–2005. We give the power law indices for the frequency distribution of peak brightness temperature which is 1.87 ± 0.05 for 17 GHz observation and is 1.64 ± 0.04 for 34 GHz observation. We also present the frequency variation of power law indices for peak flux and total energy of flare for NoRP observation, which is mono-increasing from 1 to 17 GHz.     

数控加工中切削用量的确定

数控加工在当今的冷加工中应用越来越多，其切削用量与普通机床有很大不同。本文对数控加工中切削用量的确定做了简要的分析，提供了一些选取原则和方法，并对应该注意的问题进行了分析，以供数控操作人员参考。     

发动机缸体水套热芯盒模具在生产中存在的问题及解决方案

以发动机缸体水套为例着重论述了热芯盒模具在使用中存在的问题,并针对这些问题提出了解决方案,为以后的设计积累经验。