大气参数变化对VLBI对流层时延计算值的影响

本采用我国上海、昆明和乌鲁木齐三个VLBI站的对流层大气高度参数ht和对流层内温度垂直梯度βt参数月均值资料，估计了对干大气时延的影响，结果表明在地平高度ε＝10°－20°时两参数的变化可引起干大气时延周年变化的幅值分别为1-5mm和2-15mm；ht的周日变化也可引起大气时延周日变化约1mm，因此，对于1ps级精度的VLBI物理模型，ht和βt不应当采用测站的固定常数值。     

APPLICATION OF GEOGRAPHICAL PARAMETER DATABASE TO ESTABLISHMENT OF UNIT POPULATION DATABASE

Now GIS is turning into a good tool in handling geographical, economical, and population data, so we can obtain more and more information from these data. On the other hand, in some cases, for a calamity, such as hurricane, earthquake, flood, drought etc., or a decision-making, such as setting up a broadcasting transmitter, building a chemical plant etc., we have to evaluate the total population in the region influenced by a calamity or a project. In this paper, a method is put forward to evaluate the population in such special region. Through exploring the correlation of geographical parameters and the distribution of people in the same region by means of quantitative analysis and qualitative analysis, unit population database (1km× 1km) is established. In this way, estimating the number of people in a special region is capable by adding up the population in every grid involved in this region boundary. The geographical parameters are obtained from topographic database and DEM database on the scale of     

河南省煤田地质局地勘主业发展势头强劲新提交煤炭资源储量13亿吨、食盐储量26亿吨

记者从河南省煤田地质局2007年工作会上获悉,2006年该局新提交各阶段煤炭资源储量13.023亿吨,其中可供煤矿直接建井的勘探资源储量12.185亿吨,超额完成了与河南省煤炭工业管理局签订的年提供3亿吨勘探储量的目标.     

计算机技术在物探化探应用的回顾与展望

本文综述３０年来计算机技术在物探化探中的应用，并展望它在“九五”的应用。     

建立在PC机上的区域化探数据库系统

建立在ＰＣ机上的区域化探数据库系统李松（辽宁有色地球物理勘查大队）一、系统设计的基本思想１．数据库系统的硬件运行环境为ＩＢＭＰＣ／ＸＴ机或兼容机和针式打印机。２．在中文状态下进行人机对话，给出必要的提示，便于用户使用。３．可以用多种方式录入数据，能够...