通航示范区如何先行先试?

正"通航示范区的示范意义在于集合政策与行业资源,先行先试,尽快形成产业形态与产业集聚,体现通航产业规模及社会经济效应,提振政府及行业信心,带动全国发展。"我国通用航空产业前景广阔,已成为国家供给侧结构性改革、培育发展新动能的重点行业之一。自国务院办公厅《关于促进通用航空业发展的指导意见》出台以来,国家发改委牵头陆续推出一系列落实指导意见精神的实质性举措。     

A Satellite-borne Miniature Ion Mass Spectrometer for Space Plasma

The miniature design technology is an important trend in space exploration. Mass spectrometer is used extensively in the space environment detection. The miniature ion mass spectrometer utilizes a 127° cylindrical electrostatic analyzer accompanied with a Time of Flight (TOF) unit based on ultrathin carbon foil to measure the energy spectra and composition of space plasma. The Time of Flight technique has been used broadly in space plasma measurement. A new type of miniature method for the ion mass spectrometer is introduced. The total mass of the instrument is 1.8 kg and the total power consumption is 2.0W. The calibration results show that the energy measurement range is 8.71～43550eV, the energy resolution is 1.86% and the ion mass from 1 amu (1 amu = 1.67 × 10-27 kg) to 58 amu can be resolved by the miniature mass spectrometer. The miniature ion mass spectrometer also has a potential to be increased in the field of view by an electrostatic deflecting system to extend its application in space plasma detection. The miniature ion mass spectrometer has been selected for pre-study of Chinese Strategic Priority Research Program on Space Science.      

Recent Advances in Chinese Meridian Project

To develop an understanding of near-Earth space's response to solar activities and the coupling among different layers in geospace, China has initiated a ground base program to monitor China's geospace environment called the Meridian Space Weather Monitoring Project (Chinese Meridian Project). The effort consists of a chain of 15 ground-based observatories located roughly along 120°E longitude and 30°N latitude. Each observatory is equipped with multiple instruments to measure key parameters such as the baseline and time-varying geomagnetic field, as well as the middle and upper atmosphere and ionosphere from about 20 to 1000 kilometers. This project started collecting data in 2012. We will give a brief introduction to the Chinese Meridian Project, and present recent scientific results mainly in ionospheric and atmospheric studies.      

序言

航天工业,历来被认为是一个国家综合国力、高科技实力的象征和体现,是提升国防安全的伟大事业.近年来,中国航天先后圆满完成载人航天、北斗导航、高分辨率对地观测、无人月球探测、深空探测、新一代运载火箭等多项工程任务,实现了我国进入空间和利用空间能力的重大突破.     

PARAMETRIC OPTIMIZATION AND STRUCTURAL DESIGN OF NLS

INTRODUCTIONIn general,nitrogen launching system[1,2 ] iscomprised of nitrogen cylinder,launching mecha-nism,framework and electrical system,withcompressed Nitrogen as launching energy re-sources.A physical and mathematical model isdeveloped for describing the relations betweenthe detached time and the force,volume,pres-sure,flow,displacement,velocity,acceleration ofnitrogen cylinder and launching mechanism.Thekey technique of NL S is to control detached pa-rameters by changing the press…     

Aerodynamic Design and Analysis of a Low-reaction Axial Compressor Stage

There is introduced a new low-reaction, highly-loaded axial compressor design concept which is coupled with boundary layer suction method. The characteristic features of the concept are made clear through its comparison with the MIT boundary layer suction compressor. Also are pointed out the potential applications of this concept as well as its key technological problems. Based on this concept, a single-stage, low-reaction and low-speed axial compressor is constructed in association with analysis and computation of boundary layer suction on vanes with the aid of a three-dimensional numerical approach. The results attest to the effectiveness of this way to control separation in blade cascades by the boundary layer suction and the feasibility of this proposed design concept.     

Study of the Enhancement Events of Relativistic Electron at the Geosynchronous Orbit

The high flux of energetic electron on geostationary orbit can induce many kinds of malfunction of the satellite there, within which the bulk-charging is the most significant that several broadcast satellite failures were confirmed to be due to this effect. The electron flux on geostationary orbit varies in a large range even up to three orders accompanied the passage of interplanetary magnetic cloud and the following geomagnetic disturbances. Upon the investigation of electron flux enhancement events, two types of events were partitioned as recurrent events and random ones. Both of the two kinds of events relate to the interplanetary conditions such as solar wind parameters, IMF etc and their evolution characters as well. As for the recurrent events, we found that, (1) all of the events exhibits periodic recurrence about 27 days, (2) significant increase of electron flux relates to interplanetary index and characters of their distribution, (3) the electron flux also has relation to solar activity index. An artificial neural network was constructed to estimate the flux I day ahead. The random electron flux enhancement events are rare and present different distribution figures to the recurrent ones. The figure of the random events and the conditions of their occurrence is also discussed in this paper.      

山高刀具孔加工全新理念

山高完整的孔加工方案使客户运用单一的资源就能获得高质量的成品孔,甚至是一个成品零件的金属切削整体解决方案。山高的全球制造基地紧密合作,不仅着眼于单个零件加工,更注重整个应用,并开发互补的刀具。由于孔加工占用大量的生产时间,山高提供的有关钻削、铰削和镗削的完整服务方案帮助客户简化联络、采购、仓储、技术支持、咨询和工艺方案,降低每个孔的成本。对于大量生产、成批的零件或者难加工材料的加工,提供了一整套基于客户特定目标的孔加工解决方案。     

HBM测量系统在航空航天中的应用

RUAG公司用HBM测量系统进行飞机全尺寸疲劳试验瑞士RUAG公司的研究人员对瑞士版F/A-18战斗机的加强结构进行了大规模的综合试验研究,以验证飞机结构是否能满足较高的要求,达到所需的5000个飞行小时的工作寿命。