Leg venous hemodynamics and leg volumes during a 42 day -6 degrees head-down bedrest

Seven healthy subjects were submitted to a 42-day head down bedrest, where leg venous compliance (venous distensibity index VDI) and leg volumes were assessed by mercury strain gauge plethysmography with venous occlusion and optoelectronic plethysmography, respectively. Plethysmographic and volometric measurements were made, before, during (at days 1, 4, 7, 14, 21, 26, 34 and 41), and after bedrest (days 1, 4, 7, 11 and 30 of the recovery period). Results showed a continuous decrease in leg volumes throughout bedrest, when VDI increased until day 26 of bedrest, and then decreased afterwards. The recovery period was characterized by a rapid return of VDI to prebedrest levels while leg volumes progressively normalised. These results showed that leg venous compliance changes are not always dependant upon skeletal muscle changes, and that factors other than size of muscle compartment are able to determine increases in leg venous compliance during long-term bedrest.     

The effect of head-down tilt on brain potentials related to visual attention

To study the possible effect of simulated weightlessness on brain function state, the brain event-related potentials (ERPs) in a simple visual selective response task were compared between HDT and HUT in 9 normal subjects. The results were: The Target(T) and non-Target(NT) flash signals both induced significant slow positive potentials which were supposed to related to the attention state; the amplitude of the positive potentials in frontal regions decreased significantly especially for NT-ERPs during HDT comprared with that during HUT. The data reported provide new evidence indicating that more attention should be paid on the brain function study during space flight.     

F5—1型航空发动机温度限制器的研制

介绍了用于发动机的温度限制器的工作原理，所采用的关键技术及实际应用情况。使用情况表明，该限制器设计合理，具有工作可靠，稳定，精度高的特点，实用价值较高。     

基于CFD技术的鼻腔输药的流动特性研究

鼻腔输药作为一种新颖的输药方式,具有方便可靠的特点,不仅可以适用于局部而且适用于全身用药,已经受到广泛的重视。但由于人类的呼吸道复杂的立体结构使得鼻腔输药成为生物医药研究的一个长期的挑战。利用CFD(计算流体动力学,Computational Fluid Dynamics)技术对鼻腔输药的流动特性进行研究,对一个基于真实的人类鼻腔解剖的3D模型的输药的流动过程进行了分析,着重研究了不同的药物颗粒的流动和沉淀特性。利用CFD的商用软件FLUENT在层流情况下对不同的密度、直径和流动速率的药物颗粒在鼻腔中流动进行了数值模拟,并对计算结果进行了比较分析。CFD研究的结果为鼻腔输药这种新颖的药物输送方式的优化设计提供了依据。     

中国飞机维修业职业培训

众所周知,中国的航空运输业正呈现飞速发展之势.中国民用航空总局(CAAC)给出的数据显示,今后5年中国的航空公司将引进650架飞机.今后20年,为满足不断扩张的机队对维修服务的需求,以及承接越来越多来自其他国家的飞机维修和大修业务,如客改货项目,整个民航业将需要至少24万名受过专业培训的维修人员,而现实是目前拥有的有飞机维修资质的人员离需求相去甚远,维修人员的严重短缺将对维修人员的培训提出严峻挑战.     

大厚度铝合金飞行器结构的焊接

介绍了采用熔化极脉冲氦弧焊工艺焊接大厚度铝合金燃料箱的优越性。     

Columbia--aftermath of a tragedy

The effects of the Columbia STS-107 loss on the space program are reviewed. Discussion focuses on the International Space Station and the effects of the stand-down after the accident.     

统计过程控制在西飞公司波音737-700垂尾上的应用

基于对美国波音公司先进质量体系和美国通用电器公司的六西格玛管理的研究,建立了适用于西飞公司的统计过程控制管理体系,并将该体系应用于西飞公司波音737-700垂尾的生产过程控制。实践表明,该体系的应用完善了现有统计过程控制的管理体系,同时提高了产品质量,增加了公司效益。