机载合成孔径雷达（SAR）距离高分辨的实现

本文应用一对共轭匹配的LiNbO_3基底SAW器件,在发射机中产生相干Chirp脉冲串信号,在接收机中频完成脉冲压缩,同时保存了Doppler相位信息。它较之光学、CCD及数字处理有一些不可替代的优点,并展现了机载SAR的某些特色。文中详细阐述了设计概念和LFM脉冲压缩系统,给出了实验结果和测绘飞行获得的一张雷达图像。它证明了方案和技术实施的有效性。     

Hemispheric contributions to nonverbal abstract reasoning and problem solving.

Hemispheric involvement in reasoning abilities has been debated for some time, and it remains unclear whether the right hemisphere's involvement in problem solving is modality specific or dependent on the type of spatial reasoning required. In the current study, 2 types of nonverbal reasoning abilities were examined, spatial reasoning and proportional reasoning, in 109 patients with cerebrovascular disease that was confined to either the right or the left hemisphere or was diffuse in nature. Results indicated that no lateralizing effects were present based on type of spatial reasoning. Findings are consistent with the suggestion that higher order cognitive processes involved in nonverbal abstraction and problem solving are not strongly lateralized to the right hemisphere but rather are more generally distributed throughout the cortex. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于多分辨率的图象压缩系统结构分析

本文着重对图象多分辨率技术进行分析，并提出了相应的系统结构成框架，同时还探讨了以图象多分辨率处理为核心，采用了 新的压缩编码的可能性。     

Projection center calibration by motion

Camera calibration is the first step of three-dimensional machine vision. A fundamental parameter to be calibrated is the position of the camera projection center with respect to the image plane. This paper presents a method for the computation of the projection center position using images of a translating rigid object, taken by the camera itself.

Many works have been proposed in literature to solve the calibration problem, but this method has several desirable features. The projection center position is computed directly, independently of all other camera parameters. The dimensions and position of the object used for calibration can be completely unknown.

This method is based on a geometric relation between the projection center and the focus of expansion. The use of this property enables the problem to be split into two parts. First a suitable number of focuses of expansion are computed from the images of the translating object. Then the focuses of expansion are taken as landmarks to build a spatial back triangulation problem, the solution of which gives the projection center position.     

智能型逆变式恒电位仪

介绍了一种以ＩＧＢＴ为逆变器件的智能型逆变式恒电位仪的结构和工作原理。提出了由电位和电流双环控制、脉宽调制与脉频调制相结合的控制方法。还介绍了以单片机为核心组成的智能测控单元的结构和原理。试验表明，所研制的新型恒电位仪具有效率高、体积小、重量轻、功能全、安装使用方便等优点。     

强激光的时间整形和空间整形——利用双折射透镜组实现激光束的空间整形

本文使用琼斯矩阵方法对双折射透镜组空间整形系统的光强透射率分布和工作特性进行了分析,并讨论了工程设计中参数的选择以及加工误差带来的影响等有关问题.     

DF_4内燃机车柴油机润滑油的热重分析

通过对DF_4内燃机车柴油机润滑油的热重曲线TG和微商热重曲线DTG的分析,探讨了这种润滑油的衰变规律。     

分析卤化银微晶的EDS方法探讨

本文探讨了用Ｘ射线能谱仪（ＥＤＳ）分析卤化银微晶的空间分辨率和吸收修正问题。对ＳＥＭ－ＥＤＳ和ＳＴＥＭ－ＥＤＳ两种不同分析模式的空间分辨率进行计算，表明ＳＴＥＭ－ＥＤＳ是研究单个卤化银微晶内碘的含量及分布的有效方法。并对定量分析数据和吸收修正参数进行了讨论，结果证明微晶不同区域厚度的差异，对碘含量的定量测定的影响可以忽略。     

格状编码和RS码级连技术在HDTV中应用的性能模拟

设计一种用于ＨＤＴＶ地面数字传输系统的级连格状编码和ＲＳ码方案，并对其在ＨＤＴＶ中应用进行计算机模拟。模拟结果表明：该级连格状编码方案在低信噪比具有较好的误码性能。     

Relaxation phenomena caused by equilibration of point defects

Relaxation phenomena due to equilibration of point defects in metals are reviewed. The relaxation effect in specific heat observed in tungsten and platinum confirms that in both cases the nonlinear increase in the high-temperature specific heat has to be attributed to point-defect formation. Relaxation phenomena observed by measurements of electrical resistivity and positron annihilation are also considered. The comparison of the data seems to be favorable for the conclusion that all the phenomena are of one origin.