FY-2C星多通道扫描辐射计及其在轨运行

介绍了风云二号(FY-2)C静止气象卫星多通道扫描辐射计的性能、组成和工作原理,以及为适应将3通道改为5通道而完成的5通道焦平面、光学系统、结构、电子学、红外探测器、辐射致冷器、光学薄膜和第二扫描结构等主要设计改进.卫星的在轨测试和运行结果表明,C星扫描辐射计在第一代自旋静止气象卫星上实现了包括中波红外的5通道同时对地观测,图像质量总体优于同类GMS5,METEOSAT-5静止气象卫星,与目前应用的GOES9三轴稳定静止气象卫星基本相当.     

On the correlation of the solar wind observed at the L5 point and at the Earth

The L5 point is a promising location for forecasting co-rotating high-speed streams in the solar wind arriving at the Earth. We correlated the solar wind data obtained by the Nozomi spacecraft in interplanetary space and by the Advanced Composition Explorer (ACE) at the L1 point, and found that the correlation is significantly improved from that of the 27-day recurrence of ACE data. Based on the correlation between the two spacecraft observations, we estimated the correlation of the solar wind velocity between the L5 point and at the Earth, and found that the correlation coefficient was about 0.78 in late 1999, while that of the 27-day recurrence was 0.51. Eighty-eight percent of the velocity difference falls within 100 km/s between the L5 point and the Earth. This demonstrates the potential capability of solar wind monitoring at the L5 point to forecast the geomagnetic disturbances 4.5 days in advance.     

从图像信息容量和图像功率谱看 CBERS-1卫星图像

文章从信息容量和图像功率谱这两个方面评价了CBERS-1的图像质量。并通过将同一地区的CBERS-1图像和TM图像进行比较,客现反映了CBERS-1卫星的图像质量。实验结果表明CBERS-1图像在信息丰富程度和图像综合的纹理特征上与TM图像质量相当,具有很好的可比性。     

浅析由磁条引发的乘务内话重复故障的排除

针对一起波音737NG飞机乘务话筒内话重复故障，通过观察分析、串件对比核实，确定故障原因为磁条松动，并进行了彻底排除。     

基于ECSS标准的航天器姿轨控系统内1553B总线数据协议设计

摘要： 国内外航天器姿轨控系统广泛应用基于1553B内总线的体系结构.针对国内航天器姿轨控系统内部1553B总线数据协议不统一带来的可集成性、可扩展性和通用性差的问题，本文设计了基于ECSS标准的姿轨控系统内1553B数据总线协议，从姿轨控系统内部总线数据业务需求分析出发，提出了四层结构的数据协议体系结构，重点介绍了在应用支持层和链路服务层应用ECSS标准的总线协议设计，并说明了协议的应用情况.应用该国际通用的标准协议，有助于实现国内航天器姿轨控系统内1553B总线数据协议的标准化，进而提升姿轨控系统体系结构的可集成性、可扩展性、以及星载设备(含软件)的通用化.     

Nonlinear Interactions between the Quasi 5-day Wave and Tides Based on Meteor Radar Observations at Maui

Nonlinear interactions between the quasi 5-day wave and tides based on meteor radar observation in the Mesosphere and Lower Thermosphere(MLT) at Maui are studied in this paper.Strong sum interaction between quasi 5-day wave and diurnal tide,and evident difference interaction between quasi 5-day wave and semidiurnal tide are observed during the time of attention.However,their difference and sum counterparts are clearly weaker.The secondary waves generated from those interactions beat with the tide and show intense modulation at the period of 5 days which confirms the existence of their interactions.Additionally,correlation coefficients among these waves are calculated to further explore their interactions and find that they can persist for several days although they are highly intermittent.The energy exchange among these waves can be reversible during the observational time.The periods when the significant difference interaction between the quasi 5-day wave and semidiurnal tide occur are much shorter than those when the significant sum interaction between the quasi 5-day wave and diurnal tide occur.Moreover,these two strong interactions can take place simultaneously.In generally,this study provides the proof of nonlinear interactions between quasi 5-day wave and tides which were seldom reported before.     

某型飞机典型结构应力腐蚀开裂原因分析

针对某型飞机典型结构应力腐蚀开裂问题,从材料选用、结构加工、装配工艺、服役环境等角度,结合有限元模拟细节应力分析技术,分析了发生应力腐蚀开裂的原因。基于分析结果,为新飞机制造和现役飞机维修提供相应的建议,为制造厂和维修厂提高飞机结构的应力腐蚀抗性以及结构完整性和航空安全性提供参考。     

New insights into SNR evolution revealed by the discovery of recombining plasmas

We report the discovery of recombining plasmas in three supernova remnants (SNRs) with the Suzaku X-ray astronomy satellite. During SNR’s evolution, the expanding supernova ejecta and the ambient matter are compressed and heated by the reverse and forward shocks to form an X-ray emitting hot plasma. Since ionization proceeds slowly compared to shock heating, most young or middle-aged SNRs have ionizing (underionized) plasmas. Owing to high sensitivity of Suzaku, however, we have detected radiative recombination continua (RRCs) from the SNRs IC 443, W49B, and G359.1–0.5. The presence of the strong RRC is the definitive evidence that the plasma is recombining (overionized). As a possible origin of the overionization, an interaction between the ejecta and dense circumstellar matter is proposed; the highly ionized gas was made at the initial phase of the SNR evolution in dense regions, and subsequent rapid adiabatic expansion caused sudden cooling of the electrons. The analysis on the full X-ray band spectrum of IC 443, which is newly presented in this paper, provides a consistent picture with this scenario. We also comment on the implications from the fact that all the SNRs having recombining plasmas are correlated with the mixed-morphology class.     

LEAP-X发动机的创新性技术

LEAP—X发动机是CFM国际公司研发的新一代发动机，采用了许多先进技术。本文就LEAP-X发动机的先进技术创新做一概括性分析。供相关人士参考。