适用于小型公司的 ISO 9000 质量管理系统(英文)

ＩＳＯ９０００质量管理系统往往存在一种神秘性。一般认为它只适用于大型公司，对小型公司而言，该系统实在是太昂贵了，本文澄清了这种错误的想法，并说明了ＩＳＯ９０００系统内在之属性事实上是灵活的，不论任何行业的小型公司均可适用。此外，它亦指出了认证审核员和质量管理顾问应对那些易犯的错误提高警觉。     

A simulation analysis of systematic errors in ion arrival angle and drift velocity from the satellite borne ion drift meter

As one payload of a Chinese seismic satellite program, an ion drift meter (IDM) will measure drift velocity of thermal ions at an altitude of 500 km. Previous works have shown that such instruments use biased grids to create nonuniform potential in the grid planes, which brings systematic errors to the inferred parameters. A commercial finite element analysis software is used to simulate this instrument in the exact size. The error sources from thermal velocity, nonuniform transparency of real grids and potential depression in the grid planes are explained. The simulation results show that the arrival angle and drift velocity will be underestimated in all the conditions and the maximal error will be about −0.87° and −121 m/s, respectively. Furthermore, the relative error of the inferred arrival angle and the drift velocity will be inversely correlated with the arrival angle because of the lensing effect of the potential depression. This simulation provides a quantificational method of evaluating and correcting the data during in situ operation.     

总经理致辞

亲爱的旅客:您好!非常高兴与您相逢在中国国际航空公司的班机上!感谢您选择乘坐国航的航班,对于您给予国航安全服务品质的信赖,我们感到不胜荣幸。作为我国唯一载国旗的     

基于Gibbs-Markov随机场与连通聚类的SAR图像恢复

在传统的马尔可夫随机场(MRF)的图像建模方法基础上利用合成孔径雷达(SAR)图像的固有特性对Gibbs-MRF模型进行改进复原SAR图像,并进一步提出用数字形态学中连通性理论进行图像分割。在SAR图像像素空间的邻域内,估计最大后验概率(MAP)时引用Gamma分布代替传统的瑞利分布恢复数据,同时利用像素强度值相关性的连通模型将目标较好地提取出来。充分利用了SAR图像的数字形态信息和像素强度之间的相关性,得到了更好的分割效果。仿真实验说明本文方法是有效的。     

起落架坠毁性能计算研究

对目前国内外起落架坠毁性能计算情况进行了分析,针对分析中发现的一些问题和疑问,对起落架坠毁性能计算中轮胎压死后计算和起落架结构刚度影响两个问题进行了研究,通过研究确定起落架结构刚度是起落架坠毁性能计算不可忽略的重要因素。     

基于统计分析的有限元模型修正

响应面模型代替有限元模型进行修正便于与粒子群算法等优化算法结合,有利于提高修正效率和精度。文章用某雷达卫星的简化有限元模型计算基于正交设计的各水平参数下模态频率,用方差分析确定待修正参数并构造二次响应面模型,用最小二乘法确定多项式系数,以响应面计算结果与实测结果的差值构造适应度函数并用之引导含混沌搜索机制的改进粒子群算法对待修正参数的偏移量进行寻优,修正后参数代入原有限元模型得到修正模型。修正后模型不仅能以高精度复现测试频段内的模态频率,而且能以一定精度预测测试频段外频率,证实了修正方法的有效性。     

Chang'E-1 Lunar Mission:An Overview and Primary Science Results

Chang'E-1 is the first lunar mission in China, which was successfully launched on Oct. 24th, 2007. It was guided to crash on the Moon on March 1, 2009, at 52.36oE, 1.50oS, in the north of Mare Fecunditatis. The total mission lasted 495 days, exceeding the designed life-span about four months. 1.37 Terabytes raw data was received from Chang'E-1. It was then processed into 4 Terabytes science data at different levels. A series of science results have been achieved by analyzing and applicating these data, especially "global image of the Moon of China's first lunar exploration mission'. Four scientific goals of Chang'E-1 have been achieved. It provides abundant materials for the research of lunar sciences and cosmochemistry. Meanwhile these results will serve for China's future lunar missions.      

空间绳系研究综述

空间绳系根据原理主要分为两类:动量交换绳系和电动力绳系。文章详细介绍了两者的基本原理、动力学模型和控制策略,描述了空间绳系技术实验项目的研究情况以及绳系结构设计和生存能力问题,对空间绳系的研究热点以及发展趋势进行了预测,同时列举了大量关于空间绳系技术的参考文献。研究表明:动量交换绳系和电动力绳系都可以实现无推进剂推进,提供各种离轨和再入功能,具有广阔的应用前景。