关于薄膜反射镜成形机理的研究

聚酰亚胺薄膜反射镜是近几年发展起来的新概念。以Karman方程为基础讨论了薄膜反射镜的成型原理，分析了外载荷对薄膜反射镜面型的影响；给出了非线性耦合Karman方程的求解方法；以一种聚酰亚胺圆薄膜为例，用有限元法对Karman方程进行了数值求解，用zemike多项式拟合方法得到了圆薄膜在外载荷作用下的近似解析解，证明了把Karman方程解析解表示为多项式的合理性；用有限元法得到的不同外载荷作用下的薄膜的变形分析证明了通过控制外载荷的加载方式和载荷强度可以控制薄膜反射镜的面形，改善反射镜像差。     

虚拟样机技术在双模制导系统研制中的应用

将虚拟样机技术用于双模制导系统的研制。以Pro／E为三维实体特征建模工具，MSC、ADAMS为运动学和动力学分析工具，Matlab为控制分析软件，对机械系统和控制系统进行联合分析和调试。给出了机械模型、控制模型和两者间的输入输出，以及目标运动模型的建立方法。试验结果表明，所设计的虚拟样机能用于动态校核、参数优化、回归设计和演示验证，并能进行运动分析和干涉检测、跟踪以及交班试验等。     

关于高校档案工作实行规范化建设的思考

论文针对高等教育事业迅速发展的现状,结合高校档案管理自动化和档案信息化的要求,分析了现有的《高等学校档案实体分类法》和《高等学校档案工作规范》所确定的归档范围、保管期限、分类体系以及整理规则不相适应的地方,提出了实现高校档案实体分类及有关业务环节的标准化、规范化的新思路。     

商业成像情报卫星的现状和发展趋势

分析了商业成像情报卫星的现状及其特点，展望了商业成像情报卫星技术的发展趋势。指出，商业成像卫星以其应用范围广泛、商业价值巨大而得到了美、俄等国的高度重视，并在技术上得到迅速发展；商业成像情报卫星突破或淡化了军用与民用的界限，实现了两者的信息共存、资源共享、综合利用；未来商业成像情报卫星将朝着小型化、一体化、数字化、可见光成像与微波成像的方向发展。     

一种综合性能与寿命数据的Bayes-Bootstrap方法

对现代长寿命、高可靠产品进行可靠性评估,传统大样本寿命试验和统计推断方法存在很大困难,包括伪寿命数据方法在内的性能与寿命数据综合的可靠性评估方法也存在很多问题。提出了将性能可靠性建模与Bayes方法相结合的方式解决这一困难问题,其中对性能试验数据建立性能退化模型,并利用Bootstrap方法处理伪寿命数据导致的随机性误差和构造融合Bayes验前分布,然后利用Bayes验后分析进行可靠性统计推断。对随机斜率模型和长寿命卫星动量轮轴承组件润滑寿命的应用表明,提出的方法可以充分利用产品研制、使用过程中各种类型的信息,特别是性能试验信息,具有一定的适用性。     

吸力面翼刀对压气机叶栅内二次流的影响

1引言在叶轮机械叶栅内流动控制中,可以通过在叶片吸力面、端壁上安装翼刀或隔片,控制二次流的发展,降低二次流损失,其中将翼刀加装在吸力面上的控制方式即为吸力面翼刀控制技术。吸力面翼刀主要是通过阻断端壁附面层和叶片吸力面附面层近端壁处低能流动沿吸力面的展向迁移来对     

MONITORING OF ENERGETIC PARTICLE ENVIRONMENT INSIDE THE CHINA-BRAZIL EARTH RESOURCE SATELLITE

On 14 October 1999, the Chinese-Brazil earth resource satellite (CBERS-1) was launched in China. On board of the satellite there was an instrument designed at Peking University to detect the energetic particle radiation inside the satellite so the radiation fluxes of energetic particles in the cabin can be monitored continuously. Inside a satellite cabin, radiation environment consists of ether penetrated energetic particles or secondary radiation from satellite materials due to the interactions with primary cosmic rays.Purpose of the detectors are twofold, to monitor the particle radiation in the cabin and also to study the space radiation environment The data can be used to study the radiation environment and their effects on the electronics inside the satelhte cabin. On the other hand, the data are useful in study of geo-space energetic particle events such as solar proton events, particle precipitation and variations of the radiation belt since there should be some correlation between the radiation situation inside and outside the satellite.The instrument consists of two semi-conductor detectors for protons and electrons respectively. Each detector has two channels of energy ranges. They are 0.5-2MeV and ≥2MeV for electrons and 5-30MeV and 30-60MeV for protons. Counting rate for all channels are up to 104/(cm2@s)and power consumption is about 2.5 W. There are also the additional functions of CMOS TID (total integrated dose) effect and direct SEU monitoring. The data of CBMC was first sent back on Oct. 17 1999 and it's almost three years from then on. The detector has been working normally and the quality of data is good.The preliminary results of data analysis of CBMC not only reveal the effects of polar particle precipitation and radiation belt on radiation environment inside a satellite, but also show some important features of the geo-space energetic particle radiation.As one of the most important parameters of space weather, the energetic charged particles have great influences on space activities and ground tech nology. CBMC is perhaps the first long-term on-board special equipment to monitor the energetic particle radiation environment inside the satellite and the data it accnmulated are very useful in both satellite designing and space research.     

An innovative study on low surface energy micronano coatings with multilevel structures for laminar flow design

Laminar flow design is one of the most effective ways to reduce the drag of a commercial aircraft by expanding the laminar flow region on the surface of the aircraft. As material science develops, the emergence of new materials such as low surface energy materials has offered new choices for laminar flow design of commercial aircraft. Different types of low surface energy micro-nano coatings are prepared to verify the effects on the boundary layer transition position and the drag of the airfoil through wind tunnel tests. The infrared thermal imaging technology is adopted for measuring the boundary layer transition, while the momentum integral approach is employed to measure the drag coefficient through a wake rake. Infrared thermal imaging results indicate that the coatings are capable of moving backward the boundary layer transition position at both a low velocity of Mach number 0.15 and a high velocity of Mach number 0.785. Results of the momentum integral approach demonstrate that the drag coefficients are reduced obviously within the cruising angle of attack range from 1° and 5° by introducing the low surface energy micro-nano coating technology.     

基于T-S模糊模型的模糊大系统的混合滤波

针对非线性大系统内部过程参数的检测估计,采用连续模糊大系统模型,利用lyapunov定理和分布式处理方法,给出了模糊大系统的H2/H∞混合滤波器设计方法。该方法在保证滤波误差系统全局稳定的同时,具备了H2/H∞性能。通过求解线性矩阵不等式,可以得到滤波器参数。最后,用一个数值例子验证了该方法的正确性和有效性。     

一种卫星信道的反馈优化接入机制

提高卫星信道资源利用率，探索高效可行的端站接入机制是卫星通信发展亟待解决的问题之一。当前卫星通信DVB-RCS标准基于带宽预先规划的接入机制与端站随遇接入的需求矛盾凸显，因此提出一套信道反馈优化接入机制，综合考虑各端站数据业务需求，在不改变原有协议信令特征的基础上，探索性地引入谦虚度激励方法，创造性地构造动态协商反馈模型并加以求解，达到提高端站接入数量、满足随遇接入需求、提升信道利用效率、最大化整体带宽通信业务效益的目的。通过试验验证，带宽分配反馈优化机制比传统模式提高近1倍接入率，最大端站数接入时算法耗时约只有0.67s，可为卫星信道使用提供技术参考。