球烯在RDX—CMDB推进剂中作用初探

将球烯引入ＲＤＸ－ＣＭＤＢ推进剂中，通过燃速测试和热分析试验发现，在保持压强指数不变的前提下，含球烯推进剂可使燃烧提高约４ｍｍ／ｓ。同时指出球烯很可能是固体推进剂良好的催化载体；它对于改善固体推进剂的其它多种性能可能都具有潜在的优越性。     

模拟壳体/燃烧室外压承载能力研究

为了研究固体火箭发动机的外压承载能力,了解药柱对燃烧室外压承载能力的贡献,文章对设计的模拟壳体和燃烧室进行了外压极限试验,得到了临界外压屈曲载荷.同时采用有限元软件进行了模拟壳体/燃烧室的外压稳定计算,计算结果与试验结果吻合较好.试验和计算结果都表明:虽然推进剂药柱模量较低,但其对燃烧室外压承载能力贡献较大.在固体发动机外压工况下的设计中,外压载荷指标不能仅分配给壳体,还需要综合考虑壳体与药柱的承载能力.     

ISAR干扰及干扰效果评估技术

描述了逆合成孔径雷达（ISAR）干扰技术、干扰评估技术的发展历程与现状,分析了ISAR干扰技术存在的问题,展望了这两种技术的发展趋势。     

紫外侦察告警技术

介绍了紫外侦察告警原理,分析了紫外侦察告警技术的特点和应用情况。总结了国内外紫外侦察告警技术的发展情况,最后论述了紫外侦察告警系统的组成、原理、分类和发展趋势。     

透波材料高温介电性能评价表征

概述了透波材料高温介电性能评价表征的研究意义及相关的基本概念、测试方法;介绍了国内外发展现状,以高Q腔法为例阐述了高温测试中关键共性技术,并对典型测试结果进行了分析;展望了透波材料高温介电性能评价表征的发展及应用前景.     

复杂作业模式下车间生产调度的建模与优化

针对某航天制造企业的实际生产环境,分析和讨论了复杂作业模式下车间生产的调度问题,并根据实际的业务流程建立了数学模型,通过自动调度与人工调度相结合的方法对其进行优化,最后采用实例对调度结果进行了验证.事实证明,这种调度机制可以同时增强系统的灵活性和稳定性,对提高车间生产效率和管理水平有很大帮助.     

Occurrence of medium-scale travelling ionospheric disturbances identified in the Tasman international geospace environment radar observations

The occurrence characteristics of medium-scale travelling ionospheric disturbances (MSTIDs) were investigated using the Tasman International Geospace Environment Radar (TIGER). From the occurrence study of sea echoes, we found two maxima, one pre-noon and the other after noon. They are less obvious with increase of magnetic activities, and more obvious when B_z is northwards. It is suggested that this maxima were related to fore- and after-noon maxima in the distribution of net field-aligned currents flowing from the magnetosphere to the ionosphere, and that these two regions were sources of atmospheric gravity waves (AGWs) due to enhancement of Hall conductivities in the ionosphere. The Lorentz force is suggested to be a possible mechanism for the excitation of MSTIDs in the dayside ionosphere.     

一种节省存储资源的Turbo码译码算法

针对Turbo码译码过程需要占用大量存储资源的问题，在Max—Log-MAP算法的基础上介绍了一种节省存储资源的译码方法^[1]。通过逆运算在反向递推计算后向路径度量的过程中同时计算部分前向路径度量，节省了近50％前向路径度量的存储资源；通过使用一种性能良好的线性运算代替查表法求得Jacobian（雅可比）对数函数，避免了查找表资源的使用。在避免路径度量溢出进行的归一化操作中，采用了一种有效的方案，进一步节省了计算资源。实验表明，文章方法在有效节省存储资源的同时保证了良好的译码性能。     

Remarkable Achievements of China’s Manned Spaceflight Project

On September 21,1992, the feasibility report on implementing China’s Manned Spaceflight Project was approved and a three-step development strategy was also determined. From then on, China’s Manned Spaceflight Project has developed rapidly.     

CASC Guaranteed Success of Shenzhou 9 Mission

<正>China’s first manned space docking mission between Shenzhou 9 spaceship and Tiangong1 target spacecraft achieved a complete success when all the three astronauts aboard climbed out of the Shenzhou 9 recoverable capsule in good physical condition on June 29. Jing Haipeng, commander of the Shenzhou 9, climbed out of the