新一代运载火箭

综述了国内外运载火箭的现状 ,指出了国内运载火箭技术上的差距以及研制新一代运载火箭的必要性与基本思路 ,提出了新一代运载火箭的总体技术方案 ,并对方案论证与工程实施中的几个主要问题进行了探讨     

火箭推进剂皮肤防护装备研究现状及发展趋势

对皮肤防护装备的应用和发展进行了综述，分析了塑料、橡胶与火箭推进剂的相容性，以及目前国内火箭推进剂皮肤防护装备存在的缺陷，并对推进剂专用皮肤防护装备的发展趋势进行了探讨。     

客舱英文广播的现状及对策分析

国际民航组织规定英语是国际民航的专门用语。广播的正确性、传递信息的准确性是衡量广播质量高低的标准。目前中国民航客舱英语广播不尽人意,没有达到广播应有的效果。本文根据交际理论,对客舱英文广播的现状进行分析,同时提出相应的改进对策以提高客舱英文广播的质量,进而提高安全水平和服务质量。     

陕西高职教育教学质量监控评价体系调查报告

本系统地分析了高职高专教育教学质量监控评价体系的现状、成就、存在的问题和对策，对拟建立的体系提出了建议和模型。     

Economic assessment of high-thrust and solar-sail propulsion for near-earth asteroid mining

Asteroid mining has the potential to greatly reduce the cost of in-space manufacturing, production of propellant for space transportation and consumables for crewed spacecraft, compared to launching the required resources from the Earth’s deep gravity well. This paper discusses the top-level mission architecture and trajectory design for these resource-return missions, comparing high-thrust trajectories with continuous low-thrust solar-sail trajectories. The paper focuses on maximizing the economic Net Present Value, which takes the time-cost of finance into account and therefore balances the returned resource mass and mission duration. The different propulsion methods are compared in terms of maximum economic return and sets of attainable target asteroids. Results for transporting resources to geostationary orbit show that the orbital parameter hyperspace of suitable target asteroids is considerably larger for solar sails, allowing for more flexibility in selecting potential target asteroids. Also, results show that the Net Present Value that can be realized is larger when employing solar sailing instead of chemical propulsion. In addition, it is demonstrated that a higher Net Present Value can be realized when transporting volatiles to the Lunar Gateway instead of geostationary orbit. The paper provides one more step towards making commercial asteroid mining an economically viable reality by integrating trajectory design, propulsion technology and economic modelling.     

飞机拦阻系统的现状及其发展

飞机拦阻系统是机场重要常务保障设施,用来对正常降落和因意外原因冲出跑道的飞机实施安全阻拦,以保障人机安全。本文对飞机拦阻系统的应用发展及研究现状进行了综述。     

合成孔径雷达的发展现状与未来

介绍了合成孔径雷达（SAR），特别是星载合成孔径雷达的发展现状，给出了目前国外已经发射成功的主要空间SAR的基本情况，并对其发展方向进行了展望，对合成孔径雷达系统工作者具有较好的参考价值。     

力学计量现状及发展综述

系统地综述力学各参数计量的发展历程、目前水平及先进的计量标准装置和计量方法，并对发展趋势进行了预测。     

Reminiscences of cosmic ray research in Mexico

Cosmic ray research in Mexico dates from the early 1930s with the work of the pioneering physicist, Manuel Sandoval Vallarta and his students from Mexico. Several experiments of international significance were carried out during that period in Mexico: they dealt with the geomagnetic latitude effect, the north–south and west–east asymmetry of cosmic ray intensity, and the sign of the charge of cosmic rays. The international cosmic ray community has met twice in Mexico for the International Cosmic Ray Conferences (ICRC): the fourth was held in Guanajuato in 1955, and the 30th took place in Mérida, in 2007. In addition, an international meeting on the Pierre Auger Collaboration was held in Morelia in 1999, and the International Workshop on Observing UHE Cosmic Rays took place in Metepec in 2000. A wide range of research topics has been developed, from low-energy Solar Energetic Particles (SEP) to the UHE. Instrumentation has evolved since the early 1950s, from a Simpson type neutron monitor installed in Mexico City (2300 m asl) to a solar neutron telescope and an EAS Cherenkov array, (within the framework of the Auger International Collaboration), both at present operating on Mt. Sierra La Negra in the state of Puebla (4580 m asl). Research collaboration has been undertaken with many countries; in particular, the long-term collaboration with Russian scientists has been very fruitful.