高职高专实践教学评价方案

针对高职高专教育实践教学的现状和发展趋势 ,提出了工科类高职高专院校实践教学评价方案。力求通过对高职高专院校实践教学的有效评价 ,增强实践教学能力 ,规范实践教学活动 ,提高实践教学质量     

冯子明 航空信息化专家

我国航空企业数字化制造已经有哪些成就,为我国航空企业带来怎样的影响?冯子明:目前国内飞机数字化设计制造水平在不断地提高。数字化的软硬件环境已初具规模,飞机设计已由三维几何模型设计向全信息三维模型设计方向发展     

A strategy for investigation of the outer solar system

The requirements of systematic exploration of the outer solar system have been intensively studied by a Science Advisory Group (SAG) of consulting scientists for the National Aeronautics and Space Administration (NASA). Comets and Asteroids were excluded from this study, as a separate group is planning missions to these bodies. This paper and accompanying articles on specific related scientific subjects written by members of the SAG, summarize the findings and recommendations of this group. These recommendations should not be interpreted as official NASA policy. Following some general introductory remarks, a brief sketch is given of the development and current status of scientific missions to the inner planets by the U.S. and the U.S.S.R. With this perspective, the development of the U.S. program for investigation of the outer solar system is described. The scientific focus of outer solar system exploration has been studied in detail. The relationship of the outer planetary bodies to one another and to the inner planets, as parts in a unified solar system evolved from a primitive solar nebula, is emphasized. Deductions from outer solar system investigations regarding the conditions of the solar nebula at the time of planetary formation have been considered. Investigations have been proposed that are relevant to studies of the atmospheric structure and dynamics, internal structure of the planets, satellite composition and morphology, and planetary and interplanetary fields and energetic particles. The mission type and sequence required to conduct a systematic exploration of the outer solar system has been developed. Technological rationales for the suggested missions are discussed in general terms. The existing NASA program for outer solar system exploration is comprised of four missions:

1. Pioneer 10 fly-by mission to Jupiter and beyond, currently underway, with launch on 3 March 1972;
2. Pioneer G, intended for a similar mission with planned launch 2–22 April 1973; and
3. Two Mariner Jupiter/Saturn fly-bys in 1977, with experiment selection scheduled for late 1972 and detailed engineering design during 1972–74.

The Science Advisory Group advocates that detailed mission planning be undertaken on the following additional missions for launches during the late 1970's and early 1980's. Together with existing plans, these would provide a balanced, effective exploration program.

1. 1976 Pioneer Jupiter/Out-of-Ecliptic (One Mission)
2. 1979 Mariner Jupiter/Uranus Fly-bys (Two Missions)
3. 1979 Pioneer Entry Probe to Saturn 1980 Pioneer Entry Probe to Uranus via Saturn Fly-by (Three Missions)
4. 1981/1982 Mariner Jupiter Orbiter (Two Missions).

     

工程塑料轴承用于物料处理

易格斯公司新近展示了其工程塑料制造的滑动、直线、关节轴承解决方案,通过这些新颖的方案,即使在极其恶劣的环境中,也可以大大降低维护频率,延长使用寿命.     

滕霖精密和超精密加工技术专家

随着航空机载系统市场竞争的愈发激烈,航空机载技术的先进性愈发受到重视,您认为航空机载技术的发展趋势是怎样的?滕霖:随着新一代飞行器的发展,航空机载系统正朝着综合化、精密微型化、结构轻量化     

法国遥感卫星SPOT数据1A级预处理技术

航天遥感原始数据的预处理是建立地面数据应用工程运行系统的关键技术之一。在１Ａ级预处理中，需要解决处理任务组织和系统环境支持问题，需要完成数据回放、相对辐射校正、景地理坐标计算作业，这些问题的解决方法对遥感数据处理技术具有一定普遍意义。本文还介绍了一种数据预处理系统。     

三千度扭转——易格斯新款拖链系统

<正>现今,易格斯开发出了一款创新的紧凑型拖链系统,可实现3000°旋转运行,且只需极小的安装空间。据生产商介绍,它可以很好的为能量、数据和介质提供导向     

徐华胜燃烧室技术专家

请您首先谈一谈先进航空发动机燃烧室技术的发展趋势,特别是民用航空发动机,重点要解决燃烧室什么问题? 徐华胜：燃烧室的功能是将燃料的化学能高效转化为热能,供涡轮膨胀做功,喷气发动机从诞生时采用的单管燃烧室,历经几十年的发展,到目前的高温升、高热熔短环形燃烧室,燃烧室的工作压力和温度大幅度提升.