风云二号B星原始云图中频模拟器

为了配合风云二号B星原始云图调解器的研制，制作了相关的卫星信号的中频模拟设备。该中频模拟器由突发数据源，噪声源和调制器三部分组成，介绍了其系统原理和各单元实现。     

The optical to X-ray spectrum of the broad-line ultrasoft AGN RE J2248-511

We present a series of monitoring observations of the ultrasoft broad-line Seyfert galaxy RE J2248-511 with XMM-Newton. Previous X-ray observations showed a transition from a very soft state to a harder state five years later. We find that the ultrasoft X-ray excess has re-emerged, yet there is no change in the hard power-law. Reflection models with a reflection fraction of 15, and Comptonisation models with two components of different temperatures and optical depths (kT₁ = 83 keV, T₁ = 30 eV, τ₁ = 0.8; KT₂ = 3.5 keV, T₂ = 60 eV, τ₂ = 2.8) can be fit to the spectrum, but cannot be constrained. The best representation of the spectrum is a model consisting of two blackbodies (kT₁ = 0.09 ± 0.01 keV, kT₂ = 0.21 ± 0.03 keV) plus a power-law (Γ = 1.8 ± 0.08). We also present simultaneous optical and infrared data showing that the optical spectral slope also changes dramatically on timescales of years. If the optical to X-ray flux comes primarily from a Comptonised accretion disk we obtain estimates for the black hole mass , accretion rate and inclination cos(i)  0.8 of the disk.     

Orbital phase spectroscopy of X-ray pulsars to study the stellar wind of the companion

High Mass X-ray Binary Pulsars (HMXBP), in which the companion star is a source of supersonic stellar wind, provide a laboratory to probe the velocity and density profile of such winds. Here, we have measured the variation of the absorption column density along with other spectral parameters over the binary orbit for two HMXBP in elliptical orbits, as observed with the Rossi X-ray Timing Explorer (RXTE) and the BeppoSAX satellites. A spherically symmetric wind profile was used as a model to compare the observed column density variations. In 4U 1538-52, we find the model corroborating the observations; whereas in GX 301-2, the stellar wind appears to be very clumpy and a smooth symmetric wind model seems to be inadequate in explaining the variation in column density.     

Changes in radio emission from PSR J0737–3039B

The double pulsar system, J0737–3039, provides a unique probe of a pulsar magnetosphere due to its edge-on viewing geometry, a tight orbit and a significant rate of advance of the angle of periastron. In this paper, we report on the changes in radio emission from the long period pulsar in this system, J0737–3039B, over a period of 9 months. Observations of this system with Giant Metrewave Radio Telescope (GMRT) show that the duration of the first bright phase of the pulsar centered at 210° orbital longitude from the ascending node is shrinking. These observations will be useful to constrain the proposed models for this system.     

PC—DIO─96接口板在大尺寸计量标准中的应用

介绍了美国NI公司的数据采集板PC—DIO—96的功能,及其在Windows95下软硬件的安装,描述了如何使用其随板软件包,并给出了其三种主要功能（线功能、口功能和组功能）的程序框图。详细介绍了在“建立大尺寸计量标准”题目中应用该板进行环境参数的采集和电机控制。     

CBERS-1卫星IRMSS数据及融合技术在鸭绿江口示范应用评价

文章通过丹东鸭绿江口与大连地区典型研究中采用的 CBERS-1卫星IRMSS数据,对数据图像的质量、图像信息的处理方法和专业应用潜力进行评价。通过评价IRMSS不同波段数据的应用效果,加速IRMSS数据的推广应用。     

回收着陆半实物仿真系统程控装置模拟程序设计

文章描述了回收着陆半实物仿真系统的整个框架，针对整个半实物仿真系统的设计需要和回收程控装置的特点，设计了回收程控装置模拟程序。在程序中所选择的定时方法既满足实时仿真的需要，保证了定时的精度又提高了程序的效率。该程序和半实物仿真系统为回收程控装置设计人员提供了一个快捷的平台来修改程控装置的设计时序。     

天基空间目标监视可见光遥感器研究

文章通过对美国天基可见光遥感器SBV性能和关键技术的分析，提出了发展中国天基空间目标监视可见光遥感器的建议。     

低速风洞试验数据库系统

风洞空气动力学试验是进行飞行器空气动力学研究的重要手段。如何有效管理和利用好试验数据,是风洞试验的一项重要课题。介绍笔者利用C/S、B/S技术建立的低速风洞试验数据库。     

空客A320系列与波音737NG系列飞机监造比较与研究

通过对空客A320系列和波音737NG系列飞机生产制造体系的比较和研究，系统地阐述了从监造计划制定到监造方式选择，再到客户检查项目确定以及现场检查方法等一系列飞机监造工作的基本原则和方法，同时对CAAC签发新引进飞机三证和航空公司工程管理所需的各类文件、表单进行了梳理说明，为航空公司飞机监造工作的开展提供指导和借鉴。