THE PROGRESS ON SPACE ASTRONOMY IN CHINA DURING 2000-2002

In this paper main achievements in the area of space astronomy are summarized.During the flight of cosmic Gamma-Ray Burst Spectrometer(GRBS) onboard spacecraft Shenzhou-2(launched on 2001-01-10), much observational results of cosmic γ-ray burst and solar X, γ-ray burst are obtained. The preliminary analysis on space data has lead to some interesting results. Besides it, some other long-term space astronomy programs are briefly described here.     

Unsolved problems of solar wind expansion: Can we learn anything from SOHO?

Some of the main problems of solar wind expansion are addressed. Emphasis is placed on solar wind acceleration and the mass flux problem. It is demonstrated how these two properties of the flow depend on other plasma parameters such as temperature, density and helium abundance. The importance of placing constraints on a given solar wind flow in the inner corona and at larger distances from the sun simultaneously, is also shown. Whether and how these constraints can be derived from observations carried out by SOHO instruments is then discussed.     

多光谱扫描仪的杂光计算

本文采用蒙特卡洛法计算太阳光进入星载光学系统的杂光数量级。并对一具体结构的多光谱扫描仪进行了计算，以确定其消杂光能力。对某些参数的变动也进行了计算，为设计和修改提供了依据     

Low frequency turbulence and energy dissipation in the Solar Wind

The possibility to perform in-situ measurements of velocity, magnetic field, density and temperature fluctuations in the Solar Wind has greatly improved our knoweledge of MHD turbulence not only from the point of view of space physics but also from the more general point of view of plasma physics.These fluctuations on the one hand extend over a wide range of frequencies (about 5 decades), a fact which seems to be the signature of turbulent non-linear energy cascade, on the other hand display, mainly in the trailing edge of high speed streams, a number of striking features: (i) a high degree of correlation between magnetic and velocity field fluctuations, (ii) a very low level of fluctuations in mass density and magnetic field intensity, (iii) a considerable anisotropy revealed by minimum variance analysis of the magnetic field correlation tensor. More recently it has been stressed that MHD turbulence in the Solar Wind displays a clear intermittent character.The picture which emerges from the most recent analytical theories and numerical simulations is presented. In particular the observations which give us informations about the dissipation mechanism, which remains yet largely unknown, are discussed.     

The management of stray radiation issues in space optical systems

The performance of infrared and submillimeter systems can be severely degraded by stray light. Stray light includes off-axis radiation, system diffraction and scattering effects, and thermal self-emission. The purpose of this paper is to identify several keys to preventing system degradation due to stray radiation. The first key is to apply stray light design rules and analysis techniques early in the program before the design is finalized. A systems level analysis using stray light analysis software is often necessary in order to identify more subtle problems and to assess the magnitude of their effect on system performance. Another key is to address contamination control and the choice of surface coatings early in the program. The management of stray radiation issues is extremely cost-effective, if begun early in the program, and can reduce later schedule hardships.     

高频大功率GXN—50型霓虹灯电子电源的研制

ＧＸＮ－５０型霓虹灯电子电源是为负载提供高频交流电压电流的电源设备，是一种专用大功率霓虹灯电源。该产品采用先进的电子技术，节能效率高，带负载能力强（比传统电源高４倍以上），并采用超音技术，用特制的电子开关代替价格昂贵的机械继电器，因而无任何噪声，灯光变化采用程序控制，变换方式灵活，工作稳定可靠。该电源体积小、重量轻，并设计了过压过流保护电路，具有抗干扰能力强等特点。     

轻型飞机总体性能参数多目标模糊优化设计

本文介绍了工程设计中的不确定性信息，着重讨论了轻型飞机在总体设计阶段中，对总体性能进行模糊优化设计的必要性，对蜜蜂１１号修改型飞机的总体性能参数建立了多目标模糊优化模型，并运用普遍型模糊规划的方法加以求解，优化的结果表明，蜜蜂号飞机优化后的总体性能有较大的改善，得到了更满意的飞机设计方案，本文的实践说明，如果能适当地运用模糊优化技术，会使工程设计与决策更现实，更合理。     

地球同步轨道高能电子增强事件预报方法

分析了地球同步轨道高能电子通量增强事件的发生规律及其与太阳风和行星际磁场参数的关系，并在此基础上建立了基于人工神经网络的高能电子增强事件模式，经实测数据检验，预报模式可以对未来1天的高能电子通量进行预报，误差为8．2％，达到了较高水平．     

X射线耀斑的强度指标

本文利用GOES-7卫星的1分钟记录资料研究了1991年3月和6月期间6个大X耀斑伴随的软X射线爆发特性和源强度的关系。结果指出：对X射线耀斑，其射线辐射流量上升快的在日冕中激起的激波速度也较快．数值模拟研究指出，这可能反映爆发能量释放速率是源强度的主要指标．     

电沉积太阳电池用Cu(In,Ga)Se2薄膜

在Mo基底上,采用恒电位法从含有CuCl2、InCl3、GaCl3、H2SeO3、柠檬酸的水溶液中电沉积制备Cu(In,Ga)Se2薄膜,用HCl调节pH值为2.5,并对沉积薄膜400℃左右Ar气氛中退火20min。对退火前后的膜进行X射线衍射,扫描电镜和能谱分析仪分析,结果表明,电沉积制备的Cu(In,Ga)Se2薄膜为黄铜矿结构,退火后,共沉积薄膜的结晶度提高,晶粒尺寸增加,Se含量减少。