Epilogue

Space Science Reviews -     

Epilogue: Cosmic Rays in the Active Heliosphere

Space Science Reviews -     

民用飞机液压软管安装设计探讨

民用飞机液压系统管路附件中,软管失效是导致系统可靠性降低的重要方面。分析原因发现,大部分软管失效为安装设计不恰当所致。为了设计出可靠性更高的软管,通过分析民用飞机液压软管特性,给出了软管类型选用的考虑方向,然后提出了飞机液压软管安装设计的准则,并将该准则用于指导实际设计,最后给出了软管安装设计的示例。     

高级专业技术职称任职资格评审评分参考表

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面向零件重用的零件特征数字化技术

利用零件分类与编码 (PC&C)技术实现了零件特征数字化 ,从而解决了零件重用问题 ,并在“金银花”系列之PDM系统中得以实现     

Permanent-Magnet Linear Alternators Part 1: Fundamental Equations

Powered by free-piston Stirling engines, linear alternators are proposed for space power stations as well as for isolated domestic applications, automotive, and on-Earth solar power plants. As the literature on the subject is sparse and base-design oriented, we present the general equations for both three-phase and single-phase winding configurations having permanent-magnet field excitations.     

Permanent-Magnet Linear Alternators Part II: Design Guidelines

Basic design guidelines are presented for a three-phase tubular linear alternator (LA). A numerical example for the design of a 25 kVA, 14.4 mls, 120/220 V, 60 Hz alternator is used to illustrate the procedure.     

ETS-II Experiments Part II: Earth Station Facilities

A part of the Earth station at the Kashima Branch of the Radio Research Laboratories has a highly sensitive receiving system newly designed for receiving 3 coherent and weak beacon signals transmitted from the Engineering Test Satellite Type-II (ETS-II) of Japan and obtaining propagation data on quasimillimeter and millimeter wavelengths. The ground system includes a main receiving station which has a 10-m diameter antenna for multifrequencies, highly sensitive receivers, a rain radar, which has many unique functions, a radiometer, meteorological instruments, and data processing computers. The facilities of the main receiving station for ETS-II propagation experiments, except for the rain radar, are described.     

ETS-II Experiments Part III: Weather Radar System

The weather radar system used in conjunction with Earth-satellite propagation experiments for quantifying rainfall rate in a unit volume, determined by the beamwidth and the pulselength, is described. Firstly, methods for deriving rainfall rate per unit volume are stated in detail with special emphasis on calibration to determine unknown parameters associated with propagation losses in waveguides and the atmosphere. The calibration method is somewhat different from a conventional one but is useful for routine observation. Secondly, in addition to a simple explanation of the hardware of this radar system, the data modes, developed for measuring rainfall rate along the propagation path and radar reflectivity factor in the horizontal and vertical cross sections around the station are described. These data modes are effectively combined by the operational scanning modes for routine observation of propagation experiments, while each data mode can also be operated independently. Examples obtained by each data mode are also given.     

以创新思维构建未来绿色航空业——中国学生获空客“让创意展翅高飞”大赛冠军

空中客车公司于2010年7月发起的全球大学生航空创意竞赛,吸引了来自世界75个国家和地区,287所大学的2600多名学生参赛。参赛队的创新项目均以飞机“环境生命周期”中的某个环节为对象,提出绿色环保的创新方法。南京航空航天大学5名大三学生组成的“凤凰之翼”代表队凭借其叶形旋转发电装置方案荣获冠军。     

ETS-II Experiments Part I: Japan's First Geostationary Satellite

Engineering Test Satellite Type II (ETS-11) "Kiku-2" was launched on February 23, 1977, and positioned in geostationary orbit at 130°E on March 5. Propagation experiments have been carried out by using 3 coherent beacons at 1.7, 11.5, and 34.5 GHz on a 24 h/day basis from late in April. The project and related plans are outlined. The 4 papers which follow in this Transactions introduce the experimental system and preliminary results using data from May to November 1977.     

标准贯彻实施问题撷珍之二 标准的正确应用

从标准的选用时机、选用标准数量、标准属性、标准版本的状态、新旧标准代替、标准的剪裁的经验、剪裁的定义和剪裁的意义等方面介绍标准的正确选用方法.