新型反射镜材料——碳化硅

对几种常用反射镜材料的物理性能和工艺性能进行了比较，研究了碳化硅轻质反射镜的制作工艺，结果认为：反应烧结是实现这种材料作为反射镜材料的巨大潜力的最有效的工艺，可以实现形状复杂产品的近净尺寸成型，样品在烧结过程中无收缩；样品处理时间短；无需特殊设备，在烧结过程中无需加压，样品尺寸原则上仅受烧结炉大小的限制,帛品近乎安全致密。这项研究的突破，主要依赖于反射镜成型方法及反射镜面光学加工的研究进展。最后简述了美国和俄罗斯在这方面的研究进展。     

Taiwan's second remote sensing satellite

FORMOSAT-2 is Taiwan's first remote sensing satellite (RSS). It was launched on 20 May 2004 with five-year mission life and a very unique mission orbit at 891 km altitude. This orbit gives FORMOSAT-2 the daily revisit feature and the capability of imaging the Arctic and Antarctic regions due to the high enough altitude. For more than three years, FORMOSAT-2 has performed outstanding jobs and its global effectiveness is evidenced in many fields such as public education in Taiwan, Earth science and ecological niche research, preservation of the world heritages, contribution to the International Charter: space and major disasters, observation of suspected North Korea and Iranian nuclear facilities, and scientific observation of the atmospheric transient luminous events (TLEs). In order to continue the provision of earth observation images from space, the National Space Organization (NSPO) of Taiwan started to work on the second RSS from 2005. This second RSS will also be Taiwan's first indigenous satellite. Both the bus platform and remote sensing instrument (RSI) shall be designed and manufactured by NSPO and the Instrument Technology Research Center (ITRC) under the supervision of the National Applied Research Laboratories (NARL). Its onboard computer (OBC) shall use Taiwan's indigenous LEON-3 central processing unit (CPU). In order to achieve cost effective design, the commercial off the shelf (COTS) components shall be widely used. NSPO shall impose the up-screening/qualification and validation/verification processes to ensure their normal functions for proper operations in the severe space environments.     

三种新型真空容器大门运行机构的设计

真空容器大门运行机构根据大门类型、尺寸、使用场地情况及用户的不同要求选择不同的结构形式。近年来我们公司为了不断满足市场的需求,组织专门力量开发了各种新型大门运行机构,取得了非常好的效果。文章介绍了3种真空容器大门运行机构的工作原理、设计思路以及结构组成,可供真空容器设计者参考借鉴。     

An attempt to inverse the ionospheric sporadic-E layer critical frequency based on the COSMIC radio occultation data

Ionospheric sporadic E layer refers to localized thin irregularity with enhanced plasma density appearing in the height range of ionospheric E layer (～90–130?km). The much higher electron density in the sporadic E layer than the background ionosphere would cause sudden TEC enhancement in the occultation TEC profile. A wavelet decomposition and reconstruction method is applied to extract the TEC fluctuation in this paper, and then $S_{\text{max}}$ index is defined to represent the intensity of the sudden TEC enhancement. $S_{\text{max}}$ index is compared with sporadic E critical frequency ($\mathit{foEs}$) observed by the ionosonde. The results show a well linear correlation between them with mean correlation coefficient about 0.7. Thus, an empirical linear model is established to inverse the $\mathit{foEs}$. The monthly/hourly mean values and global distribution of sporadic E intensity and occurrence ratio are calculated using this method based on the COSMIC occultation data from 2007 to 2011. The statistical analysis results indicate that it is feasible to inverse the $\mathit{foEs}$ based on the occultation TEC profile data and the inversion results can be applied to the long-term global variations of sporadic E investigations.     

基于双力源的叠加式多维力传感器校准装置研

介绍了一种基于叠加机原理的双力源多维力传感器校准装置的设计与研制,对装置的测量不确定度进行了分析,通过对三分量力传感器的校准实验,证明了校准装置不仅可以对多分量力传感器进行单分量校准,还能方便地实现耦合误差的校准。     

应用Plemelj积分生成二维通道内的正交网格

首先选用的解析函数由速度模以及流向角组成，在已知通道边界上的流向角时，求得通道边界上的速度。由势函数和流函数的定义，求出壁面上的势函数及流函数。其次将解析函数用势函数表示，运用Ｐｌｅｍｅｌｊ边界积分关系的内点公式，求得通道内任意点的势函数和流函数。由此，从等势线和等流函数值线，可形成流体力学数值计算用的正交网格。文中给出两个算例，该方法无需迭代。     

雷达网信息传输能力评估算法及仿真分析

基于对连通概率、时效性函数、误信率的具体界定，对雷达网的信息传输能力进行了系统的研究。提出了一种具有良好操作性的定量评估方法，并对传输时延动态估计算法进行了仿真。     

评定线轮廓度误差的通用数学模型

建立了用最小二乘法评定平面曲线轮廓度的通用数学模型。运用该模型可对任意平面曲线的轮廓度进行评定，从而将直线度、圆度、椭圆度以及任何线轮廓度的评定归结在统一的模式中。由于所建立的模型直观、明了，很容易在计算机上实现，因而可在生产实际中普遍推广应用。举例说明了线轮廓度误差可分离成形状误差、参数误差和位姿误差，给出了分离公式和误差补偿原则。