利用高分辨率遥感图像提取建筑物阴影信息初探

首先对上海市中心城区遥感影像建库，把众多的遥感影像数据组织起来，以方便管理和使用．在此基础上，利用GIS和RS技术，对遥感数据解译处理，提取建筑物阴影信息，从而为估算建筑物高度值作准备．     

计算机技术在《机械制图》教学中的应用

把计算机技术应用于《机械制图》课程的教学，是对《机械制图》课程传统的教学内容、教学方法和手段的重大改革、教学实践证明：该方法提高了教学效果和效率，有利于学生计算机绘图能力的培养和提高．     

2004年第6卷总目次

The signals of strain gauge transducers are very small. In consequence, error signals can even exceed the measuring signal amplitudes and therefore must be suppressed by sophisticated measuring circuits. There are absolute physical limits for the resolution of strain gauge transducer signals and the carrier frequency technique can get very close to the boundary of theoretically achievable maximum resolution. Very high gain stability can be achieved with very precise inductive dividers as reference signal sources and with auto-calibration cycles. Realisations of the philosophy are shown for high-precision static measuring units and for universal broadband amplifier systems.     

高分辨率阵列感应测井倾角影响校正研究

倾角影响校正是大斜度井和高倾角地层中应用阵列感应测井数据正确解释的前提。针对高分辨率阵列感应测井(HDIL),研究斜井解析几何因子与数值几何因子响应特性,比较分析两种几何因子的优缺点,建立解析体积几何因子和数值电荷几何因子相结合的信号处理倾角影响校正新方法,推导出设计体积滤波器和电荷滤波器的基本方程及约束条件。计算机仿真表明,基于新方法设计的滤波器和算法在倾角小于75°范围内可以有效消除测井数据中的倾角影响。     

基于双极化SAR数据的建筑栋数信息提取研究

通过分析建筑物在不同极化数据上后向散射特征的不同,提出一种基于双极化SAR数据的建筑栋数信息检测方法.该方法主要包括建筑初检测、联合HH与VV数据的检测结果修正以及使用面积阈值去除虚警3个主要部分.最后,在双极化TerraSAR—X图像上进行了验证和评价,并与基于单极化SAR数据进行建筑栋数检测得到的结果进行对比,显示了方法的有效性.     

最新科技趣味发明

世界上最薄的汽车这辆像平板一样的车子,是由佩里沃特金斯(Perry Watkins)主持设计,它的身高只有48厘米,最高时速却可以达到160km/h,是世界上拥有道路行驶证的、个子最矮的汽车。可能你会说它太慢了,离蝙蝠车差远了,但要知道,它可能是世界上唯一一辆不用变道就能完成超车的汽车了——从别的车底下钻过去。     

高分辨率处理技术在盐矿勘探中的应用

地震资料高分辨率处理技术主要是提高地震资料分辨地质体的能力,利用该数据进行解释和属性分析,在寻找隐蔽油气藏中起到重要的作用。本文针对高分辨率处理过程中噪音衰减、保真处理、频率拓宽方面进行研究,并在江苏洪泽地区盐矿地震勘探中应用取得良好效果。最终处理资料具有较高的分辨率,主频达80Hz,频宽20Hz～160Hz,为盐矿解释提供高品质的剖面。     

AutoCAD的制图原则与格式设置

通过对使用AutoCAD制图目的和良好制图习惯的论述,阐释了制图中绘图环境与格式设置的重要性及具体操作方法.     

计算机UG软件在《机械基础》课上的应用

中等职业教育以技能为主,在专业课中用计算机软件做为辅助教学,能达到事半功倍的效果,本文就把计算机三维制作软件UG应用到机械基础的专业课教学中来,让学生能够亲手制作机械的零、部件,并做装配,使抽象、枯燥的专业课变得有滋有味。     

A high-resolution environmental change record since 19 cal ka BP in Pumoyum Co,southern Tibet

A 380-cm-long sediment core was acquired from the deep water area of Pumoyum Co, southern Tibet. Twenty-five plant residue samples were selected, and organic carbon stable isotopes were obtained using the AMS ¹⁴C chronological method. The ¹⁴C age and carbon reservoir effect were calibrated with surface sedimentation rate measurements using ²¹⁰Pb dating. Results showed that the core sediment deposited over 19 cal ka BP. Based on a multi-proxy analysis of TOC and IC contents, grain size and pollen assemblage data, the palaeoclimatic evolution of Pumoyum Co was reconstructed since the last glacial. Pumoyum Co was a shallow lake prior to 16.2 cal ka BP; although the glacier around the lake began to melt due to increasing temperatures, climate was still cold and dry. In the interval of 16.2–11.8 cal ka BP, the sedimentary environment fluctuated drastically and frequently. Two cold-events occurred at 14.2 and 11.8 cal ka BP, and these may correspond to the Older Dryas and the Younger Dryas events, respectively. After 11.8 cal ka BP, Pumoyun Co developed into the deep lake as it is now. The lake water temperature was relatively lower at that time because of influx of cold water from glacial meltwater entering the lake. As a result, the multi-proxy indicators showed no sign of warm conditions. Comparisons between the sedimentary record of Pumoyum Co with that of other lakes of the same age in southern Tibet indicate a warmer climate following the last deglaciation influenced the southeastern Tibetan Plateau. These results imply that the southwest Asian monsoon gradually became stronger since the deglaciation during its expansion to the inner plateau. The glacial-supplied water of the lake responded sensitively to cold-events. The entire southern Tibet region was dominantly influenced climatically by the southwest Asian monsoon during the Holocene.