Eye light flashes on the Mir space station

The phenomenon of light flashes (LF) in eyes for people in space has been investigated onboard Mir. Data on particles hitting the eye have been collected with the SilEye detectors, and correlated with human observations. It is found that a nucleus in the radiation environment of Mir has roughly a 1% probability to cause an LF, whereas the proton probability is almost three orders of magnitude less. As a function of LET, the LF probability increases above 10 keV/micrometer, reaching about 5% at around 50 keV/micrometer.     

Prolonged weightlessness, reference frames and visual symmetry detection

We evaluated the influence of prolonged weightlessness on the performance of three cosmonauts to bilateral symmetry detection in the course of a 15-day-long Russian-French mission CASSIOPEE 96 aboard the MIR station. We tested the influence of weightlessness on subjects' performance as a function of the retinal orientation of axis of symmetry. as a function of type of stimuli (closed versus multi-elements shapes) and as a function of visual field presentation (at fixation, left visual field. right visual field). The results indicate firstly a difference between presentation at fixation versus away of fixation. Away of fixation, no effect of microgravity on performance was shown. A hypothesis of hemispheric specialization for symmetry detection was not supported as well. At fixation, an effect of micro-gravity was shown and more interestingly, the effect was quite different as a function of type of shapes used. suggesting that symmetry detection is a multiple-stage process.     

The Kinelite Project: a new powerful motion analyser for Spacelab and space station

The goal of the Kinelite Project is to develop a space qualified motion analysis system to be used in space by the scientific community, mainly to support neuroscience protocols. The measurement principle of the Kinelite is to determine, by triangulation mean, the 3D position of small, lightweight, reflective markers positioned at the different points of interest. The scene is illuminated by Infra Red flashes and the reflected light is acquired by up to 8 precalibrated and synchronized CCD cameras. The main characteristics of the system are: Camera field of view: 45 degrees; Number of cameras: 2 to 8; Acquisition frequency: 25, 50, 100, or 200 Hz; CCD format: 256 x 256; Number of markers: up to 64; 3D accuracy: 2mm; Main dimensions: 45 cm x 45 cm x 30 cm; Mass: 23 kg; Power consumption: less than 200 W. The Kinelite will first fly aboard the NASA Spacelab; it will be used, during the NEUROLAB mission (4/98), to support the "Frames of References and Internal Models" (Principal Investigator: Pr. A. Berthoz, Co Investigators: J. McIntyre, F. Lacquaniti).     

游标测距数据在导弹事后精度鉴定中的应用

Rockwell公司为奥基丹(Ogden)空军后勤中心对选定的民兵导弹试验飞行进行了精度鉴定。其中一部份工作是对“制导-雷达”斜距比对进行回归分析。一般有六或七部雷达跟踪装有C波段相干应答机的被动段飞行器(PBV)。这些雷达中有几部还能测得距离变化率数据。最近的民兵Ⅲ试验飞行中,Rockwell可以得到联邦电子公司录取的实验性距离游标器磁带。该磁带只记录了一个站的数据,在事后鉴定中与标准的雷达磁带联合使用。本报告以实例叙述了采用游标测距数据的作用。     

在火星上如何分辨时间

2012年8月6日“好奇”号火星车登上火星后，特制的火星表、戈达德研究所网站上的Mars24……这些让火星时间走进了人们的视线。     

复合材料层板纯剪实验

本文提出一个测量复合材料层板面内剪切性质的方板纯剪试验法。首先对方法的可靠性进行试验检验,然后对两种复合材料层板的剪切行为进行试验。     

COMRING：一个适用于地球观测任务和空间站的小卫星数据中继系统

ＣＯＭＲＩＮＧ（通信环）是一种适用于低轨卫星的数据中继系统新设想，该系统可在低轨迹这航天器与地面间连续传递数据（典型的可传便时间为８０～１００％）该系统可提供连续的全球覆盖而无需大规模的地面站网和不可靠的星上数据记录仪，ＣＯＭＲＩＮＧ采用７～９颗小卫星（每颗重１６０ｋｇ）以等间隔配置在用户星同一轨道上，数据的中继经由星际链路完成，用户星可以是一颗遥感卫星或一颗军用侦察卫星，用于空间站的ＣＯＭＲＩＮ     

GE和普惠再次为A3XX确定GP7267发动机的设计

GE/普惠合资公司正在研究各种易碎的轴承机匣,以作为为研究中的A3XX运输机发动机减轻重量和降低费用的一种方法.支撑该发动机风扇的第一和第二号轴承是这种机匣的可选用的轴承.该轴承机匣将用于当风扇叶片脱开时隔离风扇与发动机的其他结构.     

未来10年全球MRO市场预测

航空公司机队更新速度不断加快和飞机制造商不断采用新的技术使得飞机更加便于维护，这都将对MRO行业产生影响。尽管目前航空公司仍然保持盈利势头，但维修成本的压力持续存在。     

长期的伙伴写在与国际航空杂志社合作20年之际

在20年前的1987年9月,我开始踏上一次冒险之旅,它对于美国航空/航宇出版界来说是非常特殊的一次行动。正是由于这次冒险产生了中美之间一个多媒体的合作伙伴关系,这种合作关系每年都在不断加强,并发展成为基于悠久友谊和