我公司贯彻《航空发动机型号研制质量控制条例》的一些情况

黎阳公司是航空航天部所属为飞机提供动力装置的一家航空发动机公司。从1980年到现在,先后改进、改型、测绘研制了WP—7乙B(含M批、BM批)、WP—13(与四二○厂联合研制)以及WP—7系列中的海军防腐型等多种型号发动机。这些发动机的研制成功,有的解决了飞     

英国国家微波衰减标准的近况

英国已经使用了十来年的最高级微波衰减测量设备现在开始过时了。为了使之更现代化,近来买了两台微波合成信号源。本文叙述用这两个源研制的五套不同的测试系统。(1)0.05—18GHz 并联50KHz 替代系统.用一个感应分压器作为参考标准;(2)低漂移的串联50KHz 替代系统;(3)采用相干检波的串联替代系统,其动态范围达150dB;(4)一个用于自动校准程控衰减器的0.05—18GHz 电压比系统:(5)一个用于精密测量波导壁损耗的非常稳定的微波电桥。     

硝胺/丁羟复合推进剂的固化机理的研究(第二部分)

这篇报告是为了改进硝胺系复合推进剂的工艺性能和力学性能而进行的几个实验之一,得到了如下结果。(1)将三乙醇胺(TEA)加到硝胺系复合推进剂中,其工艺性能下降而力学性能却明显得到改进。(2)端马来酐化聚丁二烯(MPB)可以明显改进硝胺系复合推进剂和过氯酸铵系复合推进剂的工艺性能。(3)通过向硝胺系复合推进剂添加MPB和TEA,可以使工艺性能和力学性能均得到改进。(4)通过向粘合剂组分中添加TEA来改进粘合剂力学性能。(5)将TEA添加到粘合剂组分中,可明显改进RDX系复合推进剂的力学性能,但对AP系、GB(玻璃珠)系则几乎没有改进。     

缩比固体火箭发动机试车中出现的内弹道畸变

在全尺寸和缩比固体火箭发动机试车中,出现被认为是由燃速变化而引起的内弹道曲线中部畸变。预测的和实际的压力——时间曲线、推力——时间曲线之间的差别,既不能预测,又没有完全了解。但是,用手工方法和自动化方法已描述了这种中部畸变特征。在以过氯酸铵为氧化剂的烃类推进剂中观察到上述现象。为改善工艺性能而降低了粘度的这类推进剂可使这种畸变扩大。为了找出这种畸变的可能来源,分析了缩比试验发动机试车的压力—时间曲线、推力——时间曲线和推力压力比与时间的关系曲线。对发动机尺寸、工作条件和推进剂配方进行了研究,以确定发生畸变的可能原因和验证畸变的可能机理。     

Earth benefits from space life sciences

Contributions of space exploration which are widely recognized are those dealing with the impact of space technology on public health and medical services in both urban and remote rural areas. Telecommunications, image enhancement, 3-dimensional image reconstructions, miniaturization, automation, and data analysis, have transformed the delivery of medical care and have brought about a new impetus to the field of biomedicine. Many areas of medical care and biological research have been affected. These include technological breakthroughs in such areas as: (1) diagnosis, treatment, and prevention of cardiovascular diseases, (2) new approaches to the understanding of osteoporosis, (3) early detection of genetic birth defects, (4) emergency medical care, and (5) treatment of chronic metabolic disorders. These are but a few examples where technology originally developed to support space medicine or space research has been applied to solving medical and health care delivery problems on Earth.     

战术导弹强度与环境技术交流会在柳州召开

由航天工业部科学技术委员会委托航天工业部第三研究院第三设计部主持召开的战术导弹强度与环境技术交流会于1982年10月30日至11月3日在广西柳州举行。来自各有关设计、制造、试验、研究与教学各方面近30个单位的90余位代表参加了会议,他们向会议提出了近80篇技术报告。会间,哈尔滨工业大学副校长黄文虎教授作了题为“结构动力学发展中的几个问题”的报告,王锋教授作了题为“断裂力学在飞航式导弹上的应用”的报告,中国科学院力学研究     

Neutral buoyancy and sleep-deprived serum factors alter expression of cytokines regulating osteogenesis

We examined expression of genes associated with cytokine production, and genes implicated in regulating bone metabolism, in bone stromal and osteoblast cells incubated under standard ground conditions and under conditions of neutral buoyancy, and in the presence/absence of serum from normal or sleep-deprived mice. We observed a clear interaction between these two conditions (exposure to neutral buoyancy and serum stimulation) in promoting enhanced osteoclastogenesis. Both conditions independently altered expression of a number of cytokines implicated in the regulation of bone metabolism. However, using stromal cells from IL-1 and TNFx cytokine(r) KO mice, we concluded that the increased bone loss under microgravity conditions was not primarily cytokine mediated.     

Vanguard--a European robotic astrobiology-focussed Mars sub-surface mission proposal

We present a new European Mars mission proposal to build on the UK-led Beagle2 Mars mission and continue its astrobiology-focussed investigation of Mars. The small surface element to be delivered to the Martian surface--Vanguard--is designed to be carried by a Mars Express-type spacecraft bus to Mars and adopts a similar entry, descent and landing system as Beagle2. The surface element comprises a triad of robotic devices--a lander, a micro-rover of the Sojourner class for surface mobility, and three ground-penetrating moles mounted onto the rover for sub-surface penetration to 5 m depth. The major onboard instruments on the rover include a Raman spectrometer/imager, a laser plasma spectrometer, an infrared spectrometer--these laser instruments provide the basis for in situ "remote" sensing of the sub-surface Martian environment within a powerful scientific package. The moles carry the instruments' sensor head array to the sub-surface. The moles are thus required to undergo a one-way trip down the boreholes without the need for recovery of moles or samples, eliminating much of the robotic complexity invoked by such operations.