摘要：A frequency-multiplied source at the terahertz band using discrete planar Schottky diodes, which is a critical element in heterodyne instruments, has been studied by some domestic research institutions in recent years. Besides the design method, there are still many crucial problems that must be taken into consideration in the design. This article mainly discuss three aspects based on the measured data of a 225 GHz tripler that we designed. Firstly, the accuracy of the diode model concerns the reliability of the simulation results. According to the Spice parameters and the measured results, the physical size and the DC parameter of the Schottky diode can be corrected until there is a good consistency between the simulated and measured results. Secondly, the heat accumulation happens to the Schottky junction when the high input power is added. A steady-state thermal simulation is done and the results show that the hottest temperature is about 140℃ with 250 mW input power, which is safe to the diode. Lastly, some non-ideal factors are brought during the assembly process such as the uncertainty in the conductive adhesive shape and location deviation of the circuit. Furthermore, the effect on the performance of the frequency multiplier is calculated in this work.

摘要：Chang'E-1 is the first lunar mission in China,which was successfully launched on Oct.24th,*** was guided to crash on the Moon on March 1,2009,at 52.36°E,1.50°S,in the north of Mare *** total mission lasted 495 days,exceeding the designed life-span about four months.1.37Terabytes raw data was received from Chang'*** was then processed into 4Terabytes science data at different levels.A series of science results have been achieved by analyzing and applicating these data,especially "global image of the Moon of China's first lunar exploration mission".Four scientific goals of Chang'E-1 have been *** provides abundant materials for the research of lunar sciences and *** these results will serve for China's future lunar missions.

摘要：中国科学院空间科学与应用研究中心(以下简称空间中心)成立于1987年,前身为空间物理所(1958年成立的原应用地球物理所)和空间科学技术中心(1979年成立).1994年又与中国科学院空间科学与应用总体部合并.合并后的空间中心既是在空间科学、技术和应用研究领域以高技术研究发展为主导,从事战略性科技创新和基础性研究的科研基地型研究所,也是一个承担着系统设计和系统集成并协调重大空间任务,为空间任务提供科学和技术支持的总体性机构.