排序方式: 共有139条查询结果,搜索用时 625 毫秒
131.
论述了在同一坐标系中,对平曲线上第一缓和曲线、圆曲线和第二缓和曲线的任意点上的坐标值精确求解的原理、步骤和方法,使3段曲线用同一个函数分段进行表示,利用Excel完成复杂的数学计算,求出曲线上任意一点的坐标值,用于AutoCAD设计和施工精确放样。这成果对于采用现代化的CAD技术测试公路曲线具有借鉴和参考意义。 相似文献
132.
Comparison between Neuman (1975) and Jacob (1946) application for analysing pumping test data of unconfined aquifer 下载免费PDF全文
Pumping test of a water table aquifer is carried out to estimate the aquifer parameters, the obtained data were analysed through the solution of both Neuman (1975) and Jacob (1946) methods through AQTESOLV and Spreadsheet programs, the results of each methods are compared to evaluate the applicability and accuracy of the solution theoretically and practically. In the paper an example is presented, which is conducted for a constant rate pumping test from Ohio, in Fairborn (near Dayton), and it supplied by S.E. Norris (U.S. Geological Survey, Columbus, Ohio). The main objective of this study is to introduce both program and the way of the applications, and compare the results and the hand on of both programs in the field. 相似文献
133.
134.
135.
136.
137.
138.
文章主要探讨MapGIS区合并后,同一区中点图元过多的问题,分析了产生该问题的基本原因,结合Excel探讨了采用MapGIS空间分析与投影变换功能解决该问题的方法. 相似文献
139.
采用CAD软件绘制地质图件时,常遇到不断重复简单的绘制命令,从而使得制图工作沉闷、低效、多错。介绍了利用Excel的编制函数功能与CAD命令窗口相结合的原理、方法及常用手段,通过实例来说明如何实现地质制图过程的快速、准确与高效。 相似文献