提高人员心理素质 改善气象服务质量

安全是民航工作永恒的主题,是民航发展的生命线。国际航空运输协会(IATA)航空中心的统计表明,有80%的事故与人为因素有关。因此,必须开展人为因素的研究,以提高航空安全管理水平,逐步减少人为差错事故。心理素质作为人为因素的重要组成部分,也应引起我们的重视。一、航空气象预     

几种新型的星载多光谱和成像光谱仪

近几年出现了几种新型的星载多光谱和成像光谱仪,例如:Landsat-7卫星的有效载荷增强型主题测绘仪+（ETM+）;EOS AM-1卫星的有效载荷多角度成像光谱仪（MISR）和先进空间热发射和反射辐射计（ASTER）;特殊探测器紫外成像光谱仪（SSUSI）。文章从结构、性能参数等方面综述了这几种星载成像光谱仪。     

Y19-1飞机飞行试验数据采集系统

简要介绍Y19- 1 飞机飞行试验数据采集系统的组成和工作原理。着重阐述固态记录可编程采集编码器的特点     

自由—自由结构振动模态的一阶导数

空间飞行器和车辆等一大类结构属于自由—自由结构。本文讨论这类结构的振动模态－阶导数计算问题，提出了一种改进的截尾模态展开法，将未知模态对模态导数的贡献用已知模态和系统矩来表达。针对刚度阵奇异问题，提出了移位措施，通过选择的移位系数，不仅解决了奇异问题，而且加速了算法的收敛速度。给出了一个数值例子，算例表明本文方法十分有效。     

混杂复合材料导流器保护罩的研制

通过对混杂复合材料及其成型工艺的研究,分析其工艺特性,采用层间混杂与层内混杂相结合的方式,研制出了具有良好的耐烧蚀性和隔热性的导流器保护罩。经车载与飞行试验,保护罩未出现异常,满足设计要求。     

复合材料壳体磁场固化技术

环氧树脂基复合材料及缠绕壳体在磁场中缠绕和固化的技术为前苏联独有,美国只作了一些验证研究。这种技术使得复合材料加工过程中树脂基体发生物理和化学变化,固化后力学性能显著改善,而且质量更加稳定。实现该技术的设备已在前苏联应用。磁场中固化还适用于树脂涂层和粘接层。     

运用数学方法模拟推进剂贮箱增压

本文介绍了运用数学方法模拟推进剂贮箱内的增压、传热和传质的物理热动力过程.增压系统的目的是控制推进剂贮箱内的气体空间(也称为"气垫空间")压力和进入发动机的推进剂质量流量.用数学模拟来预测气垫和推进剂的状态以保证贮箱内的压力和温度值保持在认可的限度内,即使离开贮箱的推进剂压力满足发动机泵入口的净吸程要求.     

二硝酰胺铵(ADN)球形化工艺研究

介绍了近年来国外关于二硝酰胺铵（ADN）球形化的工艺方法，重点讨论了中间介质、分散剂、表面活性剂和热稳定剂的作用及其选择方法。     

Vibration and pulsation processes in feed systems of liquid rocket engines

Pulsation and vibration process in high speed centrifugal pumps and feed lines were investigated. Linear and quadratic relations between pulsation parameters and main factors were obtained. The investigation of turbopump low frequency oscillations showed that the intensity of pulsations is proportional to the pump specific linear size. Linear mathematic models with lumped parameters fairly well demonstrate the vibration influence on low frequency flow pressure vibrations in pumps and feed lines. It is shown that, in some conditions, the pressure oscillation amplitude distribution by the vibrating feed lines length may be characterized by the presence of a node in an intermediate section. A one-dimensional mathematic model based on wave equations proved to be suitable for calculations of vibration and pulsation parameters within a wide frequency range.     

Changes in organ perfusion and weight ratios in post-simulated microgravity recovery

Head-down tilt models have been used as ground-based simulations of microgravity. Our previous animal research has demonstrated that there are significant changes in fluid distribution within 2 h after placement in a 45 degrees head-down tilt (45HDT) position and these changes in fluid distribution were still present after 14 days of 45HDT. Consequently, we investigated changes in fluid distribution during recovery from 16 days of 45HDT. Changes in radioactive tracer distribution and organ/body weight ratio were examined in rats randomly assigned to a 45HDT or prone control group. The 45HDT rats were suspended for 16 days and then allowed to recover at the prone position 0, 77, 101, or 125 h post-suspension. Animals were injected with technetium-labeled diethylenetriamine pentaacetate (99mTcDTPA, MW=492 amu, physical half-life of 6.02 h) and then killed 30 min post-injection. Lungs, heart, liver, spleen, kidneys, and brain were harvested, weighed, and measured for radioactive counts. Statistical analyses included two-way analysis of variance (ANOVA) that compared 45HDT versus controls at the four experimental time points. The organ weight divided by the body weight ratio for the brain, heart, kidneys and liver in the 45HDT rats was significantly different than the control rats, regardless of time (treatment). There was no difference between the different time points (time). The average 99mTcDTPA count divided by the organ weight ratio values for the heart, liver, and spleen were significantly higher in the 45HDT group than the control group. The average counts for the heart and spleen were significantly higher at 77, 101, and 125 h than at time zero. We conclude that the major organs have different recovery patterns after 45HDT for 16 days in the rat.