奥巴马的私斗

巴拉克·奥巴马是一个令人难以捉摸的人物,无论其对手还是拥护者都将他视为一个谜。不知为何,2008年竞选活动中的奥巴马似乎变成了一个截然不同的奥巴马总统。两个奥巴马不仅在政治上是不同的,在心理上也是不同的。那个温和派的、使人安心的奥巴马不见了,取而代之的是一个更为冷静超然、难以读懂的奥巴马。美国人难以对这个奥巴马做出反应,因为他们不确定其源自哪里,受到了什么激发。关于奥巴马,我们真正了解到的有多少呢?     

美国西南航适航指令事件始末

在2007年3月,美国西南航空公司(SWA)发现自己所运营的飞机不符合适航指令(AD)后将这一问题通过自愿报告系统(VDRP)向其审定管理叻公室(CMO)进行汇报,并采取补救措施.与此同时,SWA有46架与AD不符的波音737飞机又继续运营了9天.SWA的主管称其误以为CMO准许其继续运营.     

供应链管理:基于RFID技术的后勤保障

美国国防部和全美最大的零售商都打算自2005年1月日起开始采用RFID标签。RFID智能标签的推广已势在必行随着产品挂签日期的临近,相应标准还在制定之中。相对而言民用航空领域的RFID应用更为超前一些。     

Progress of Space Medicine Research in China

With the approaching of the Chinese Space Station (CSS) era, the focus of space medicine applications and related research has shifted to addressing the astronauts' health support in long-duration spaceflights, including nutrition, countermeasure against the physiological effects of weightlessness, medical monitoring and support, psychology status, etc., and accordingly the human experiments to simulate long-duration weightlessness have been carried out. Increasingly, basic research has been put forward in the key areas, such as space bone loss, cardiovascular dysfunction and the molecular mechanisms underlying radiobiological effects. Moreover, specific novel research fields, such as hypometabolism technology, were explored. The research projects in the field of space medicine experiment, as an important aspect of the Chinese Space Station's application, have been officially approved and launched.      

Science Missions Using CubeSats

As the role of missions and experiments carried out in outer space becomes more and more essential in our understanding of many earthly problems, such as resource management, environmental problems, and disaster management, as well as space science questions, thanks to their lower cost and faster development process CubeSats can benefit humanity and therefore, young scientists and engineers have been motivated to research and develop new CubeSat missions. Not very long after their inception, CubeSats have evolved to become accepted platforms for scientific and commercial applications. The last couple of years showed that they are a feasible tool for conducting scientific experiments, not only in the Earth orbit but also in the interplanetary space. For many countries, a CubeSat mission could prompt the community and young teams around the world to build the national capacity to launch and operate national space missions. This paper presents an overview of the key scientific and engineering gateways opened up to the younger scientific community by the advent and adaptation of new technology into CubeSat missions. The role of cooperation and the opportunities for capacity-building and education are also explored. Thus, the present article also aims to provide useful recommendations to scientists, early-career researchers, engineers, students, and anyone who intends to explore the potential and opportunities offered by CubeSats and CubeSats-based missions.      

美空军提出挽救国防工业计划

美空军2号人物提出了一项摆脱美国防工业困境的计划,即通过充分减缓飞机这类武器系统的生产来适应国防经费的削减,但同时通过充分地预测以保持一支能应付两个较大规模地区冲突的军事力量。     

SAAB340B安装主动式噪声控制系统

亨廷航空公司(Hunting Aviation)已经完成了为Saab340B安装两个超级电子公司的主动式声音控制系统的任务,通过一个主动式座舱噪声降低系统为装有涡桨发动机的萨伯飞机进行了为期一年的噪声监控工作。 许多公司都在为涡桨飞机研制和试验噪声控制系统,其中包括GEC-马可尼电子公司、法国塞克斯坦特航空电子公司-马特拉·凯普系统公司合资企业以及美国洛德公司,但是萨伯公司已决定选用超级电于公司(正式命名为道蒂公司)的噪声降低系统作为Saab340BPlus(最新型的涡桨飞     

美空军为保F-22延迟JPATS,TSSAM

为了确保一些主要计划不受影响,美国空军向美国国防部提出了一个节约经费的方案包括将它的新的初级教练机和火力圈外发射的隐身导弹计划推迟三年.早在8月,一份来自美国国防部副部长约翰·多伊切的备忘录建议,国防部准备取消或推迟9项重要的国防系统计划,包括F-22、联合初级教练机系统(JPATS)、远程三军火力圈外攻击导弹(TSSAM)计划.空军的这次反提案正是为了想确保F-22计划,只是同意降低一些即将生产的预生产型飞机的比例,而同意     

MIL—STD—1750A的检验测试

本文描述了计算机正确实现 MIL—STD—1750A 结构规范的理由和重要性。文中叙述了简要的检验史。描述了现有的测试方法,包括测试过程,结果分析及试验报告。最后讨论了将来的检验测试方法。 STD—1553数据总线。多指令系统结构的扩增问题导致多硬件和软件系统,从而导致软件费用高使用 MIL—STD—1750A ISA,我们可以降低软件成本。缩短软件研制时间,并促使工业使用新技术,使用ATP 作为检验测试工具,确保结构与 MIL—STD—1750A的兼容性,使上述优点成为可能。当检验过程在1983年第3季度使用时。将通过使用 VSW 使之增强。刘茴译刘花校     

铝锂合金——新一代轻型金属结构材料

在低比重铝合金基础上发展起来的铝锂合金的进展愈来愈快,在此期间首先为商业的需要,制造出了半成品,并投放市场。本文介绍了为首的三名制造者Alcan,Alcoa及Pechiney制造的合金,并说明了目前铝锂合金的研究和发展状况,同时试图谈谈未来发展概况。