电子抗干扰改善因子(EIF)

人类发展的历史是不断战胜邪恶的历史,在雷达发展史上也同样有类似的情况,在人类发展过程中,人创造了雷达,雷达用于战争,提供了远距离的,全天候的眼睛。这样就出现了电子干扰进入雷达图象的现象。人们观察到了电子干扰,就决定纠正,因此就产生了电子抗干扰。在雷达初期阶段,在雷达作用距离范围内几乎观察不到干扰,提高雷达灵敏度以增大探测距离会产生不需要的副作用。但自然电子干     

Investigation of low-energy proton effects on aptamer performance for astrobiological applications

Biochips are promising instruments for the search for organic molecules in planetary environments. Nucleic acid aptamers are powerful affinity receptors known for their high affinity and specificity, and therefore are of great interest for space biochip development. A wide variety of aptamers have already been selected toward targets of astrobiological interest (from amino acids to microorganisms). We present a first study to test the resistance of these receptors to the constraints of the space environment. The emphasis is on the effect of cosmic rays on the molecular recognition properties of DNA aptamers. Experiments on beam-line facilities have been conducted with 2 MeV protons and fluences much higher than expected for a typical mission to Mars. Our results show that this irradiation process did not affect the performances of DNA aptamers as molecular recognition tools.     

Status and efficacy of countermeasures to physiological deconditioning from space flight

The recent biomedical investigations conducted on the Space Shuttle and Spacelab have provided a wealth of biomedical information, including the ability to test the efficacy of proposed countermeasures. This achievement was made possible by the ability to conduct mechanistic and control-interventive studies simultaneously with a large number of individuals over a relatively brief period and to compare these data with results obtained from the Skylab missions. Comparisons between short- and long-duration results were limited to establishing trends or extrapolating from short-duration missions. To date, we have evaluated several protocols involving the lower-body negative pressure (LBNP) device, the bicycle-ergometer, the treadmill and preparations for body-fluid replenishment. In many instances, the traditional means of applying these protocols were not sufficient to protect against space-related deconditioning. This paper will review current countermeasures and compare their efficacy to that of existing protocols. Results from in-flight and ground-based experiments will be presented to illuminate the recommended protocols and procedures.     

设计一种性能评价系统的全面质量管理方法(英文)

本文在评价全面质量管理（Ｔｏｔａｌｑｕａｌｉｔｙｍａｎａｇｅ－ｍｅｎｔ,ＴＱＭ）的基础上,提出一种改进的性能评价系统（Ｐｅｒｆｏｒｍａｎｃｅａｐｐｒａｉｓａｌｓｙｓｔｅｍ,ＰＡＳ）。文中强调理解顾客（包括管理人员及雇员）对于ＰＡＳ的要求,从而突出简化该评价系统的基本要素及实施过程。经过改进的评价系统包括工作策划、审议及对个人、集体及管理人员所作的贡献进行评估。此外,将评估标准分为三类,这已成为方便大多数雇员有效的评价方法,同时给那些需要改进的个人以积极改进的余地。如果在全面质量管理中首先强调人的因素,那么人事体制也必须体现这一原则。     

碧血情殉——记抗日期间空军一对恋人的痴情感人故事

日本军阀于1931年在我东北借故发动九一八事件,侵占我东北三省,乃其阴谋侵略我国的第一步,当时使我全国同胞震惊,大家同仇敌忾一心抗日.不少热血青年争相从军报国,在学青年不少也弃笔从戒,改考各军事学校救亡图存.其中有的则受国父的航空救国的感召,投考航空学校的更形踊跃.须知当时的航校除在杭州有一中央航空学校之外,仅在广州尚有一个广东航校,在柳州也有一个广西航校而已,且各校每期招生人数有限,加上报考人数多,能考上被录取的比率,平均只有百分之一、二而已,其难度有似满清时代考状元一样.乃因当年所定空勤体检标准特别高,是考生们的难关.当时在杭州国立艺专就读的有位南国青年名叫黄荣发,每次假日身临风景明媚的西子湖畔,每值碰上穿着军装神气活现的航校学生,总觉得不是味道,与自己有些差异.他原是一个活泼好动的青年,什么学校不进,偏偏进去与自己个性完全不相称的艺专,而且还是千里迢迢远从广东台山家乡而来,未免有点委屈了自己的感觉.1935年夏,他已按耐不住,要非去改考航校不可,正是皇心不负苦心人,他被录取了,黄是个性情好动的人,在南京小营军校入伍的期间,每遇校中有任何游艺集会的场合,总少不了有他的表演.小提琴固是他拿手节目之一,尚有和尚学女舞一项,每次表演的花样     

AIRCRAFT DESIGN EXPERIENCE

Some of the author's experiences of aircraft design are described in the present report, and it is hoped that they would be of some interest to the aircraft designers.