Protein crystal growth aboard the U.S. space shuttle flights STS-31 and STS-32.

The first microgravity protein crystal growth experiments were performed on Spacelab I by Littke and John. These experiments indicated that the space grown crystals, which were obtained using a liquid-liquid diffusion system, were larger than crystals obtained by the same experimental system on earth. Subsequent experiments were performed by other investigators on a series of space shuttle missions from 1985 through 1990. The results from two of these shuttle flights (STS-26 and STS-29) have been described previously. The results from these missions indicated that the microgravity grown crystals for a number of different proteins were larger, displayed more uniform morphologies, and yielded diffraction data to significantly higher resolutions than the best crystals of these proteins grown on earth. This paper presents the results obtained from shuttle flight STS-32 (flown in January, 1990) and preliminary results from the most recent shuttle flight, STS-31 (flown in April, 1990).     

潜艇雷达隐身用吸波涂料研究

本文研究了ＸＦＴ－２吸波涂料的吸收性能和一系列机械物理特性。试验结果表明，该涂料满足潜艇用吸波材料的技术要求，在潜艇隐身技术研究中有广泛的应用前景。     

用电荷耦合器件测量激波辐射

用电荷耦合器件作摄谱探头，进行激波辐射的测量，解决了测量中遇到的同步问题。测量结果与一米光栅摄谱仪的记录干板比较，效果良好。     

基于退火惩罚混合遗传算法求解生产批量计划问题

针对以获得最低生产成本为目的的批量生产计划问题，提出了该问题的混合整数规划模型，首先，根据单级多资源批量计划问题的特点提出了问题的数学描述，；然后根据该数学问题的复合性，利用遗传算法的随机搜索和进行化过程寻找问题的全局最优解，为了防止适应度函数的过早收敛，引入退火惩罚因子对适应度函数进行处理，使得获得全局优解的可能性加大，实验结果表明，该方法能获得比传统遗传算法更为理想的近似最优解。     

基于信息管理与融合技术在目标类型识别上的研究

在系统模型的基础上结合实战提出影响目标飞机类型识别的证据,并按照影响程度进行优先权排序;结合数据库,提出证据概率计算的数学表达式;采用深度优先搜索的融合模式,按照D-S证据理论进行融合计算;在传感器管理模块的作用下,对融合结果进行反馈控制;结合实例,对系统进行仿真验证,证明其可靠有效。     

星载微波辐射计地面定标系统研究

论述了用星载微波辐射计性能测试的地面定标系统。该系统由定标负载，定标接收机，转以，微波屏蔽暗室，微机及附件组成，利用微机对地面定标系统转台转速和ＳＭＲ一些参数进行控制，并对测量定标数据进行实时采样，处理和显示。     

S波段振荡器的计算机辅助设计

介绍优化设计振荡器的全过程,阐述优化设计振荡器的原理和方法,分别从线性和非线性方面阐述设计和分析的过程。根据优化设计的结果对振荡器进行生产和试验,试验结果较好地符合仿真的结果,满足设计的要求,这也证明微波计算机辅助设计(CAD)对微波电路的设计是非常有用的     

固体燃料冲压发动机自持燃烧的影响因素

采用试验和仿真方法,研究了固体燃料冲压发动机(SFRJ)自持燃烧的主要影响因素。研究结果表明:SFRJ内为典型的扩散火焰,化学反应特征时间与反应物停留特征时间的比值是影响发动机自持燃烧的关键参数,该值越小,扩散火焰越稳定;本文研究工况下,较小的后台阶高度即可保证发动机实现自持燃烧,后台阶稳定火焰的物理原因是在固体燃料表面附近形成一个低速区,保证了固体燃料的分解燃烧,当台阶高度为0时,由于化学反应特征时间与反应物停留特征时间的比值迅速增加,SFRJ无法自持燃烧;台阶高度较小时,点火过程会对SFRJ的稳定燃烧产生影响,SFRJ可能会出现熄火复燃现象。     

Hamilton体系下的扩展有限元方法

基于Hamilton体系下的弹性力学理论,推导了扩展有限元法的有关公式。具体计算了含裂纹的等厚度薄板的应力强度因子,数值分析所得结果与精确解进行了比较,证明了本文方法的正确性。本文为扩展有限元研究提供了一种新的数值计算方法,拓展了扩展有限元的基础理论。     

Feasibility of developing an ionospheric E-region electron density storm model using TIMED/SABER measurements

We present a new technique for improving ionospheric models of nighttime E-region electron densities under geomagnetic storm conditions using TIMED/SABER measurements of broadband 4.3 μm limb radiance. The response of E-region electron densities to geomagnetic activity is characterized by SABER-derived NO⁺(v) 4.3 μm Volume Emission Rates (VER). A storm-time E-region electron density correction factor is defined as the ratio of storm-enhanced NO⁺(v) VER to a quiet-time climatological average NO⁺(v) VER, which will be fit to a geomagnetic activity index in a future work. The purpose of this paper is to demonstrate the feasibility of our technique in two ways. One, we compare storm-to-quiet ratios of SABER-derived NO⁺(v) VER with storm-to-quiet ratios of electron densities measured by Incoherent Scatter Radar. Two, we demonstrate that NO⁺(v) VER can be parameterized by widely available geomagnetic activity indices. The storm-time correction derived from NO⁺(v) VER is applicable at high-latitudes.