基于扩展的SURF描述符的彩色图像配准技术*

目前大多数图像配准算法都需要先将彩色图像转换为灰度图像再进行图像配准,色彩信息的丢失可能引起图像的误匹配。本文在SURF算法的基础上,提出了构建颜色描述向量扩展SURF描述符,形成ESURF描述符,再进行图像配准的方法。该算法能够充分利用彩色图像的色彩信息,相比大多数算法基于灰度图像的配准方法有更高的鲁棒性,同时继承了SURF算法良好的性能。描述符性能测试和图像配准测试证明：ESURF算法比灰度图像SURF算法在图像尺度变化、旋转、模糊、视角变化、特别是光照变化方面有更高的鲁棒性。     

Design optimization of stiffened storage tank for spacecraft

Stiffened storage tank is an important structural component in spacecraft. Its structural weight is one of the key criterions in the design phase. This paper focuses on the design optimization of the structure by using finite element method, structural sensitivity analysis techniques, and sequential linear/quadratic programming aimed to reduce the structural weight. Design variables include the numbers of stiffeners, stiffeners’ section dimensions, and shell thickness distribution. Detailed finite element modeling processes are presented, which are the ways to construct the stiffener (beam orientation and offset) and shell elements and the ways to determine the analysis model and structural boundary conditions. A brief introduction to sensitivity analysis and optimization solution algorithm is also given. Main attention is paid to the studies of design optimization of the tank structure, including the selection of design cases, evaluation, and comparison of the optimal results. There are six design cases considered in the design procedures. Numerical results show that by using the above computational techniques, the structural weight is effectively reduced. In this work, MSC.Patran/Nastran is employed to construct the Finite Element Model (FEM), and JIFEX, which is developed in our group, is used to conduct the structural design optimization. JIFEX is a structural analysis and optimization software package developed by Gu and colleagues in the Dalian University of Technology Department of Engineering Mechanics. Among its many functions is the ability to analyze and optimize piezoelectric smart structures.     

Investigation of stress corrosion cracking initiation of 7A52 aluminum alloy

The stress corrosion cracking(SCC) behaviour of 7A52 aluminum alloy in air and in 3.5% NaCl solution was researched by slow strain rate test(SSRT) and SEM-EDS. The SCC susceptibility was estimated with the loss of the reduction in area. The experimental results indicate that the SCC susceptibility of 7A52 aluminum alloy in 3.5% chloride solution is the highest at strain rate of 1×10-6 s-1. The lowest one is under the condition of 1×10-5 s-1. Stress concentration and anode dissolving around Al-Fe-Mn intermetallics initiate micropores which will result in microcracks. The existence of intermetallics in the microstructure may play an important role in understanding the SCC initiation mechanisms of 7A52 aluminum alloy.     

新型空间平台发展模式探析

近年来,美国等航天国家研究提出了多种多样的新型空间平台,并开展了系列飞行试验。主要简述了美国XSS（experiment satellite series）计划、轨道快车、轨道转移飞行器、快速响应空间航天器、X-37B和F6系统等新型空间平台的情况,总结了其发展特点,提出了新型空间平台的发展模式。     

国防知识产权生成模式研究

国防知识产权不同于一般知识产权,其生成必然遵循相应的客观规律。从国防知识产权的内涵出发,在分析其生成过程的基础上,提出2种不同的生成模式,并结合我国国防科技领域发展现状对其进行评价,希望能以此为我国国防知识产权相关问题研究提供一定参考。     

航天发射任务组织指挥工作相关问题研究

加强新形势下航天发射任务组织指挥能力建设是满足我国当前高密度多样化发射任务要求的重要内容。分析了航天发射任务组织指挥工作的建设需求,在此基础上对航天发射任务组织指挥工作需要解决的关键问题进行了查找和反思,提出新形势下组织指挥工作的总目标以及建设的原则,同时针对存在的问题给出相应的建议和改进措施。     

美军武器装备激励约束定价机制研究

在分析美军武器装备约束激励定价的3种机制,即成本激励约束定价、技术激励定价和进度激励约束定价的方法和标准基础上,概括了美军武器装备激励约束定价的主要特点,提出了我军建立武器装备激励约束定价机制的几点思考。     

空间目标非灾难性撞击毁伤模型研究

针对空间目标在动能杀伤飞行器（kinetic kill vehicle,KKV）非灾难性撞击下的毁伤模型进行研究。对弹目撞击想定进行分析,结合NASA撞击解体判据,着眼KKV小型化发展趋势,指出广义顺轨拦截能够有效避免目标灾难性解体,减轻撞击事件对空间环境的污染;对目标易损性进行分析,基于目标功能构型建立目标毁伤树模型,以密度等效原则建立目标多层板靶等效模型;以THOR方程预估射弹侵彻效能;从部件物理毁坏和功能衰减2方面建立目标毁伤概率模型;进行仿真案例分析。算例结果表明：非灾难性撞击足以有效毁伤目标。     

装备价格管理体制改革问题研究

装备价格管理体制是装备价格制度的核心,事关当前装备价格制度改革的成败。阐述了装备价格管理制度体制的现状,剖析了装备价格管理体制存在的主要问题,澄清了装备价格管理体制改革的基本认识,提出了装备价格管理体制改革的一系列政策建议。     

美军提高国防经费购买力政策解析及启示

阐述了美军提高国防经费购买力的一系列政策,包括：确定可承受性目标和控制费用增长、激励工业部门提高生产力和不断创新、推进实质性竞争、提高采办服务的商务技能,以及减少无效过程和官僚作风等。分析了美军提高购买力的具体措施,提出了改进我军装备采购管理的对策建议。