基于局部熵差的图象匹配方法--算法及计算机仿真

传统的灰度相关匹配和基于边缘特征的匹配方法抗噪能力和抗几何失真能力较差，将信息熵的概念引入到图象匹配中，定义了图象局部熵，并由此提出一种新颖的基于局部熵差的图象匹配方法。由于图象熵反映的是图象的局部，因此基于局部熵差的图象匹配方法具有较强的抗噪能力。由于采用了分块、序贯检测及分层搜索技术，计算量大为减少，试验结果表明这是一种非常好的图像匹配方法。     

嵌入式系统在微纳卫星上的应用

自20世纪80年代以来，随着微小卫星技术在世界范围内的发展，各国均在微小卫星领域进行了广泛和深层次的研究。特别是近几年来，由于微米／纳米技术水平的迅速提高，出现了许多新技术和研究成果，使得微型卫星（100kg以下）和纳型卫星（10kg量级）有了充分的发展空间。与大卫星以及100kg以上的小卫星相比，微纳卫星具有研制周期短、成本低、重量轻、体积小和功耗低等特点，这对设计和制造的各项技术提出了更高的要求。     

用于声纳设备中的分布式遥控遥测技术

给出了一种在声纳站中用ＰＣ型微处理机和ＭＣＳ－８０３１型单片机构成的分布式数据采集和遥控系统。该系统利用ＰＣ机具有良好的人机界面、丰富的软件资源及灵敏多样的显示功能，以及８０３１系列单片机的多机通讯功能相结合。对相距几十米甚至几百米距离上的下位机进行控制和数据采集，在ＰＣ机的ＣＲＴ上进行显示和处理。     

掺铈玻璃型二次表面镜热控性能稳定性研究

对卫星用掺铈玻璃型二次表面镜(SSM)的热控性能在空间辐照环境中的长期稳定性进行了研究。给出了经紫外、电子和质子模拟辐照试验后，导电和非导电掺传玻璃型二次表面镜热控性能的数据，并对其衰退机理进行了分析。结果表明，掺铈玻璃型二次表面镜的热控性能在地球同步轨道空间辐照环境中的长期稳定性可以满足卫星设计要求。     

火星探测器降落伞系统综述

文章介绍了美国火星探测器降落伞系统组成和验证试验情况；分析了5种不同探测器降落伞系统的具体差异；归纳了探测器降落伞系统的结构和性能参数；重点介绍了“凤凰号”和“火星科学实验室”降落伞系统研制过程和性能验证试验。     

Effect of temperature on corrosion behavior of 3003 aluminum alloy in ethylene glycol–water solution

The effect of temperature on the corrosion behavior of 3003 aluminum alloy in ethylene glycol–water solution was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) techniques. The surface characterization was observed and determined by scanning electron microscopy(SEM), atomic force microscopy(AFM) and energy dispersive spectrometer(EDS). The results demonstrate that the anodic aluminum dissolution and the cathodic oxygen reduction were accelerated by the increased temperature. However, as temperature was over60 °C, the solubility and concentration of oxygen decreased, resulting in the inhibition of cathodic reaction. The cathodic reaction rate of 3003 aluminum alloy rose to the maximum at 60 °C. The Warburg impedance in Nyquist diagram diminished and then was replaced by a negative capacitance caused by the absorption of intermediate corrosion product on electrode. On the other hand,after potentiodynamic measurements, 3003 aluminum alloy suffered pitting corrosion. The dissolution of aluminum alloy around secondary phase particles expanded both horizontally and vertically.     

光纤技术在液位、位移测量中的应用

综述了光纤传感技术的最新发展和高光纤技术在液位、位移测量中的应用,给出了许多成功的应用范例。     

Emission heights of coronal bright points on Fe XII radiance map

The study of coronal bright points (BPs) is important for understanding coronal heating and the origin of the solar wind. Previous studies indicated that coronal BPs have a highly significant tendency to coincide with magnetic neutral lines in the photosphere. Here we further studied the emission heights of the BPs above the photosphere in the bipolar magnetic loops that are apparently associated with them. As BPs are seen in projection against the disk their true emission heights are unknown. The correlation of the BP locations on the Fe XII radiance map from EIT with the magnetic field features (in particular neutral lines) was investigated in detail. The coronal magnetic field was determined by an extrapolation of the photospheric field (derived from 2-D magnetograms obtained from the Kitt Peak observatory) to different altitudes above the disk. It was found that most BPs sit on or near a photospheric neutral line, but that the emission occurs at a height of about 5 Mm. Some BPs, while being seen in projection, still seem to coincide with neutral lines, although their emission takes place at heights of more than 10 Mm. Such coincidences almost disappear for emissions above 20 Mm. We also projected the upper segments of the 3-D magnetic field lines above different heights, respectively, on to the tangent x–y plane, where x is in the east–west and y in the south–north direction. The shape of each BP was compared with the respective field-line segment nearby. This comparison suggests that most coronal BPs are actually located on the top of their associated magnetic loops. Finally, we calculated for each selected BP region the correlation coefficient between the Fe XII intensity enhancement and the horizontal component of the extrapolated magnetic field vector at the same x–y position in planes of different heights, respectively. We found that for almost all the BP regions we studied the correlation coefficient, with increasing height, increases to a maximal value and then decreases again. The height corresponding to this maximum was defined as the correlation height, which for most bright points was found to range below 20 Mm.     

结构光三维视觉及其在工业中的应用

介绍结构了光三维视觉原理及实现方法，讨论了结构光三维视觉在工业视觉检测和机器人的导引中的应用，所列实例体现了结构光视觉应用的最新研究成果。     

DATA MODEL FOR MULTIMEDIA DATABASE SYSTEM NHMDB BASED ON NF~2 DATA MODEL

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