巡航导弹航向规避弹道的优化设计

航向规避弹道的设计可视为一个多约束的优化问题。对此，通过选择导弹到达每个航路点的时间，用两点约束问题代替多点约束问题，得出了控制能量最优解，并分析了弹道特性。计算结果表明，弹道曲线在不超出导弹可用过载的前提下，通过所有航路点，并满足落点要求。该方法可用于航迹规划研究。     

介万奇 凝固理论与技术专家

您一直致力于凝固理论与技术方面的研究，并主持了多项国家计划、国家自然科学基金项目，请您谈谈您带领的团队在不断的探索和实践中所取得的成果以及目前研究项目的进展情况。     

延长丁羟推进剂适用期的实验研究

本文介绍了用旋转粘度计测量推进剂固化系统(即药浆分散相)粘度的方法,进行丁羟推进剂适用期延长剂筛选的实验研究,以及用推进剂药浆验证的结果,发现最有效的适用期延长剂是四环素.     

Dual-frequency ultrasound for detecting and sizing bubbles

ISS construction and Mars exploration require extensive extravehicular activity (EVA), exposing crewmembers to increased decompression sickness risk. Improved bubble detection technologies could help increase EVA efficiency and safety. Creare Inc. has developed a bubble detection and sizing instrument using dual-frequency ultrasound. The device emits “pump” and “image” signals at two frequencies. The low-frequency pump signal causes an appropriately-sized bubble to resonate. When the image frequency hits a resonating bubble, mixing signals are returned at the sum and difference of the two frequencies. To test the feasibility of transcutaneous intravascular detection, intravascular bubbles in anesthetized swine were produced using agitated saline and decompression stress. Ultrasonic transducers on the chest provided the two frequencies. Mixing signals were detected transthoracically in the right atrium using both methods. A histogram of estimated bubble sizes could be constructed. Bubbles can be detected and sized transthoracically in the right atrium using dual-frequency ultrasound.     

Communicating bioastronautics research to students, families and the nation

The National Space Biomedical Research Institute (NSBRI) is supporting the National Aeronautics and Space Administration's (NASA) education mission through a comprehensive Education and Public Outreach Program (EPOP) that communicates the excitement and significance of space biology to schools, families, and lay audiences. The EPOP is comprised of eight academic institutions: Baylor College of Medicine, Massachusetts Institute of Technology, Morehouse School of Medicine, Mount Sinai School of Medicine, Texas A&M University, University of Texas Medical Branch Galveston, Rice University, and the University of Washington. This paper describes the programs and products created by the EPOP to promote space life science education in schools and among the general public. To date, these activities have reached thousands of teachers and students around the US and have been rated very highly.     

载人飞船主动流体循环回路离心泵可靠性试验研究

文章通过对泵组件可靠性指标的分析 ,根据泵空间飞行的实际情况 ,进行了可靠性试验方法分析 ,描述了可靠性试验系统与试验结果 ,得出了飞船离心泵组件满足可靠性指标达到 0 999的结论。     

微放电效应研究进展

微放电效应是空间大功率微波部件的特殊效应之一。文章简要介绍了微放电效应的概念,重点阐述了微放电效应在理论分析及数值模拟、多载波微放电、抑制方法和实验测试等4个方面的研究进展,最后指出了微放电未来发展的趋势。     

模拟生命

纵观热带雨林这一地球上最丰富多彩的生态系统,科学家一直在思考,40多亿年来,覆盖我们这个荒芜星球表面的众多化学物质是如何从原始混沌态转化为连贯有序的生化态的.研究化学进化论的学者逐渐倾向于下述观点,即出现史前生命并非是不可能的.使用计算机实验手段,通过模拟原始生命的产生过程,我们可以清楚地看到,化学物质是如何首次搅起古老地表的生物潮,并逐渐发展进化为复杂的生化态,由此产生从微生物直至人类等一系列生命模式.     

并行工程在型号研制中的应用

论述了在飞机型号研制过程中开展并行工程的现实意义，提出了产品联合工作组IPT的组织结构、工作规范，协同工作环境以及并行设计的过程定义及过程控制。     

《军用飞机结构完整性大纲－飞机要求》介绍

本文着重介绍了新的国家军用标准《军用飞机结构完整性大纲－飞机要求》的编写背景以及编写指导思想，这对学习理解这项新的国家军用标准，会有所帮助。