AB beam propulsion for interplanetary flights

The author offers a revolutionary method—non-rocket transfer of energy and thrust into Space with a distance of millions of kilometers. The author has developed the theory and made the computations. The method is more efficient than transmission of energy by high-frequency waves. The method may be used for space launch and for accelerating the spaceship and probes for very high speeds, up to a relativistic speed by the current technology. The research also contains prospective projects which illustrate the possibilities of the suggested method.     

卫星光学遥感系统优化设计与像质评价探讨

介绍了卫星光学遥图像获取与图像处理一体化优化设计的思路；运用通用像质方程（GIQE）对于利用小相对孔径光学系统和调制传递函数补偿（MTFC）方法得到的图像的品质与利用相对较大相对孔径光学系统得到的图像的品质进行了对比分析。     

一种再入飞行器结构的热流载荷反演方法

提出了一种基于共轭梯度法的再入飞行器热流载荷反演方法.以一维结构为例验证反演方法的有效性,并分析了材料温变热物性参数和传感器测量误差对反演精度的影响;进而针对热防护结构和返回舱结构开展了热流载荷反演分析.结果表明:本文方法能有效地反演热防护结构和返回舱结构的热流载荷;考虑材料的温变热物性参数会使得反演过程存在非线性因素...     

Optimal guidance based on receding horizon control for low-thrust transfer to libration point orbits

This paper addresses the design and computation of a guidance law for a transfer mission from an orbit near the Earth to a halo orbit around the libration point L₂ in the Sun–Earth system. The guidance law, which is designed based on receding horizon control and compensates for launch velocity errors that are introduced by inaccuracies of the launch vehicle, is solved using the generating function method. During the design of the closed-loop guidance law, the entire transfer mission, which is considered a nonlinear optimal control problem, is evaluated to obtain a nominal reference trajectory. Using the launch velocity errors and the uncertainty of the model, a spacecraft controlled by the proposed guidance law tracks the reference trajectory. Furthermore, the original Riccati differential equation in the receding horizon control algorithm is replaced by an equivalent convenient form of the Riccati differential equation that is based on the generating function. The high-efficiency solution of the equivalent equation avoids the online direct integration of the original Riccati differential equation, which significantly increases the computational efficiency for the receding horizon control problem. Numerical simulations using a nonlinear bicircular four-body model demonstrate the capabilities of the proposed receding horizon guidance law for the transfer mission. In addition, the generating function method improves the computational efficiency by at least one order of magnitude over the backward sweep method in solving the receding horizon control problem.     

Space technology transfer: Spin-off cases from Japan

Government organizations have to justify high expenditure during periods of financial crisis such as the one we are experiencing today. Space agencies have attempted to increase the returns on their investments in space missions by encouraging the commercial use of advanced technologies. This paper describes two technology transfer (TT) cases promoted by JAXA, in order to identify the organizational models and determinants of TT. The development of a TT process from space to Earth not only benefits the aerospace industry but also the network of national companies. The aim of the paper is to investigate who the actors are and the nature of their role, as well as the determinants of the TT process in the Japanese space sector. The case studies confirm the typical path of transfer as ‘Earth–space–Earth’.     

低温推进剂输送与预冷系统间歇泉不稳定性数值模拟研究

针对低温推进剂（液氧）输送与预冷系统间歇泉不稳定性进行了模拟与数值试验研究。分析与验证了连接液氧贮箱的底端封闭垂直管路的典型间歇泉不稳定过程,对经验Murphy曲线进行了检验。针对自然循环型的低温推进剂输送与预冷系统不稳定性及典型间歇泉的发生,进行了稳定域的计算与影响参数分析,研究了过冷度、输送管漏热、发动机进出口阻力、回路高度,以及回流管漏热（保温状况）对各域边界的影响。     

轮椅电机传动机构（中轴,齿轮）热处理工艺设计及改进

高精度齿轮高频淬火，选择合适的材料，增加稳定化处理，改善高频加热方法，可有效降低其热加工变形，保证其精度要求。     

空间非合作目标消旋技术研究现状总结与展望

针对空间非合作目标开展在轨服务、轨道清除等需要在轨捕获任务的顺利实施,在捕获前一般需要对非合作目标进行消旋。系统调研了国内外针对空间非合作目标的消旋方案,并将其分为基于能量转移和基于能量损耗的两种方案。在对两类方案的具体原理及操作过程与关键技术进行总结的基础上,概括了各方案的特性及其适用场景,分析了未来空间非合作目标消旋技术的发展方向。     

Latent heat flux and air temperature anomalies along an active fault zone associated with recent Iran earthquakes

Pre-earthquake physical and chemical interactions in the earth’s ground may cause anomalies in latent heat flux, air and surface temperature. Earthquakes occur when the energy accumulated in rocks releases. Sometimes, the movements of the ground cause ruptures in the earth’s surface and sometimes the two sides of an existing fault shift towards each other. In a structurally complex and inhomogeneous collision region such as the Iranian Plateau, seismicity is not the result of activity of a single fault but is due to energy discharge in fault zones hundreds of kilometers wide.     

Establishing space industry in developing countries: Opportunities and difficulties

Although it is generally agreed that the outer space should be used for the benefit of all mankind, only a fraction of the countries have the necessary technological base for accessing space. Space technology, with its implications on science, economy and well-being of citizens, is mostly chosen as one of the priority areas for technological development by developing countries. However, there is already an over-capacity in global space industry and there are doubts on necessity of additional capacity establishment by developing countries. In this study, the importance and benefits of capacity-building in these countries are emphasized and the advantages and disadvantages that developing countries have in the framework of space technology acquisition are briefly presented. The feasibility of certain levels of space technology is discussed and the necessity of combining existing indigenous capabilities with technology obtained from foreign sources in the optimal way is stressed. We have also mentioned various general mechanisms of technology transfer and argued the importance of licensing in catching-up developed countries. After considering the necessary conditions of efficiency of technology, such as establishment of regional centers of space science and technology education by United Nations, joint development of space systems, complete technology transfer packages, cooperative space projects within regional organizations, coordinated constellations and special agreements with large space agencies, which are specific mechanisms already in use, are reviewed. Some typical examples of mechanisms are also given with special emphasize on small satellite technology that makes access to space affordable for many countries. Through sharing and analyzing the experience of developing countries in their odyssey of space capacity-building, the difficulties can be negotiated and the vicious circles can be broken. This study, in our view, is a step to incite a general discussion of obstacles and opportunities for developing countries, that could help them in using their limited resources effectively, hence, enable them to offer better conditions to their citizens and to contribute space science to a larger extend.