免棱镜激光全站仪与fx-4800P计算器配合使用应用技术介绍

文章介绍京福高速公路南平段NLA1合同段堵兜隧道施工中免棱镜激光全站仪与fx-4800P计算器配合使用技术。     

FORTRAN程序调用C语言函数过程的方法

本文介绍FORTRAN语言调用C语言过程的方法。     

ZS6型直线振动筛的优化设计

针对原ZS6型振动筛投入现场应用过程中存在的问题，采取优化设计理论对％S6型直线振动筛进行了改进设计。以激振频率和隔振系统刚度为设计变量，以隔振系数(传递给底座的动载荷)最小化为目标函数，考虑到16个约束条件，建立了直线振动筛优化设计数学模型。采用综合约束函数双速下降算法编制了优化设计程序，计算出不同设计变量初值情况下的优化设计结果。改进后的ZS6型直线振动筛的激振效果得到改善，从而可大大提高钻井液的净化效果。     

一类高阶线性微分方程解的正规性问题0174．52

研究了高阶线性微分方程f^(n) an-Lf^(n-1) …aLf^’ a0f=0的解的正规性问题，其中系数ai(0≤i≤n-1)为整函数或只有有限个极点的亚纯函数．     

反馈网络的反馈系数与负载效应的函数性

给出了四种负反馈电路反馈系数F的精确计算公式和近似计算公式。证明了电压负反馈电路的反馈系数和反馈网络的负载效应,都是负载RL的函数。     

Monitoring the sandstorm during spring season 2002 and desertification in northern China using SSM/I data and Getis statistics

A massive sandstorm enveloped most part of northern China during the spring season 2002. Monitoring the evolution of sandstorm and desertification has become one of the most serious problems for China's environment. Since 1989, one of the most advanced and operational passive microwave sensors is the DMSP SSM/I (special sensor microwave imager) operated at seven channels (19, 37, 85 GHz with the vertical and horizontal polarization and 22 GHz with vertical polarization only). In this paper, the sandstorm and desertification indexes, SDI and DI, are derived from the radiative transfer equation, and are employed with multi-channel measurements of the DMSP SSM/I for monitoring the sandstorm and desertification in northern China. Some SSM/I data in 1997 and 2001 are employed. The algorithm of Getis statistics is developed to categorize the spatial correlation and its evolution these days. It is demonstrated that the SSM/I indexes, SDI and DI, and its Getis statistics are well applicable for monitoring the sandstorm and desertification.     

基于C/S结构的全国大学英语等级考试管理系统

全国大学英语等级考试管理一直是各高校的教务工作的重点,基于C/S模式结构的全国大学英语等级考试管理系统在安全性能、管理权限和简化管理难度等方面比其同类系统具有更突出的优点,特别是在考试报名和考试成绩查询方面极大的方便了考生,也简化了学校考试管理的工作。本文介绍了以Delphi平台结合SQLServer数据库开发该系统C/S模式三层结构的方法,并给出了主要部分程序代码。