Far-UVC light as a new tool to reduce microbial burden during spacecraft assembly

This work aims to investigate far-UVC light at 222 nm as a new microbial reduction tool for planetary protection purposes which could potentially be integrated into the spacecraft assembly process. The major advantage of far-UVC (222 nm) compared to traditional germicidal UVC (254 nm) is the potential for application throughout the spacecraft assembly process in the presence of humans without adverse health effects due to the limited penetration of far-UVC light into biological materials. Testing the efficacy of 222-nm light at inactivating hardy bacterial cells and spores isolated from spacecraft and associated surfaces is a necessary step to evaluate this technology. We assessed survival of Bacillus pumilus SAFR-032 and Acinetobacter radioresistens 50v1 exposed to 222-nm light on proxy spacecraft surfaces simulated by drying the bacteria on aluminum coupons. The survival fraction of both bacteria followed a single stage decay function up to 60 mJ/cm², revealing similar susceptibility of both species to 222-nm light, which was independent of the exposure rate. Irradiation with far-UVC light at 222 nm is an effective method to decontaminate the proxy spacecraft materials tested in this study.     

求解含多个右端向量非对称线性方程组的自适应块拟最小残量IOM(q)算法

许多实际应用问题需要求解含多个右端向量的大型非对称线性方程组 ,通常是把原来方程组分成单独几个含一个右端向量的方程组 ,再用某种迭代法分别单个求解 ,而更加经济有效的方法是应用能同时产生几个迭代向量的块迭代法来直接求解。本文在 IOM(q)算法的基础上 ,提出一种求解此类方程组的块拟最小残量 IOM(q)算法 ,讨论了如何收缩掉已收敛的部分方程组以及如何从产生的块 Krylov序列中删除线性相关或几乎线性相关向量的自适应技术。数值试验表明 ,此新的自适应块算法比块 GMRES算法及其他相关算法具有更好的收敛行为、更少的计算量和 CPU计算时间 ,是求解此类方程组的一种更加经济有效的算法。     

航天用35Ah氢镍电池组性能

简要介绍了电池组的构成以及电池组空间力学环境测试条件和模拟GEO试验制度。在电池组性能方面 ,比较了第 1阴影期中间和第 36阴影期中间 79%DOD的放电特点 ,概要介绍了充放电温度特性 ,容量与氢压的变化关系 ;特别在寿命特性方面 ,着重阐述了电池组在模拟GEO ,79%DOD下 40个阴影期间最大放电深度时终止电压变化特性 ,电池组容量变化以及第 3阴影期和第 36阴影期放电终止电压变化情况。还列出了电池组的主要技术性能指标。     

柔性环境中的多目标决策及应用

提出了解决柔性环境中的多目标决策的一种人机交互式方法，该方法包括两个层次：（１）运用ｍａｘｉｍｉｎ方法进行优化；（２）根据决策者的愿望调整参数，再回到（１）。在计算机上实现了以上方法，并将该方法应用于修水县的扶贫规划。     

星光对机动弹道导弹主动段的修正

 <正> 以惯性技术为主,并以星光、无线电等其它技术为辅的组合导航及制导技术是70年代以来发展较为迅速,并被认为是行之有效的技术手段。特别是对于大型航空航天飞行器。例如航天飞机、远程导弹等,只有采用精密的组合导航技术才能保证这类飞行任务的完成。任何单一的导航及制导技术都有其长处及弱点,将这些单一的技术手段组合起来扬长避短、相互补偿,毫无疑问是一种可行的途径。星光的引进将会使对     

Probing the era of galaxy formation via TeV gamma ray absorption by the near infrared extragalactic background

We present models of the extragalactic background light (EBL) based on several scenarios of galaxy formation and evolution. We have treated galaxy formation with the Press-Schecter approximation for both cold dark matter (CDM) and cold+hot dark matter (CHDM) models, representing a moderate (z _f 3) and a late (z _f 1) era of galaxy formation respectively. Galaxy evolution has been treated by considering a variety of stellar types, different initial mass functions and star formation histories, and with an accounting of dust absorption and emission. We find that the dominant factor influencing the EBL is the epoch of galaxy formation. A recently proposed method for observing the EBL utilizing the absorption of 0.1 to 10 TeV gamma-rays from active galactic nuclei (AGN) is shown to be capable of discriminating between different galaxy formation epochs. The one AGN viewed in TeV light, Mrk 421, does show some evidence for a cutoff above 3 TeV; based on the EBL models presented here, we suggest that this is due to extinction in the source. The large absorption predicted at energies > 200 GeV for sources at z > 0.5 indicates that observations of TeV gamma-ray bursts (GRB) would constrain or eliminate models in which the GRB sources lie at cosmological distances.Now at University of Chicago, Dept. of Astronomy & Astrophysics.     

偏振光干涉计量中的椭圆偏振化误差分析

主要分析两束相互垂直的线偏振光经过金属反射镜反射后引起的椭圆偏振化的不对称性，并研究由此产生的非线性误差的变化规律，这对提高偏振光外差干涉仪的测量精度是极为重要的。     

Phase Space Density Analysis of Energy Transport in the Earth’s Magnetotail

Two energetic events in the Earth’s magnetotail detected by Geotail are examined with detailed analysis of three-dimensional velocity phase space density. It is found that the occurrence of multiple ion components is high during these dynamic episodes. Different populations evolve independently of each other, suggesting particles from multiple activity sites contributing to the observed phase space density. The transport properties with consideration of multiple components are evaluated, with the result showing significant differences from those based on a single fluid approach. This comparison indicates that precise evaluation of the energy and magnetic flux transport of energetic events in the magnetotail requires resolving individual populations in the phase space density.     

先进战斗机控制分配方法研究综述

综述了先进战斗机控制分配方法的研究和应用状况。文中首先介绍了4种主要的控制分配方法———广义逆法、串接链法、直接分配法和数学规划法,给出各种方法在飞行控制系统分配应用中的限制,然后简单介绍控制分配方法在现实飞行控制系统中的应用情况,最后对控制分配中的几个关键问题进行了分析总结。     

环境设计中的光效应与色彩

本文对光与色的关系进行了简要的阐述。从光与色的概念到对人们的心理感受，对形体的感受以及同环境的关系，可以了解到光的效应同色彩的组合参考建筑环境设计的重要性。