A field experiment was carried out to study nutrient balance among N, P, K and Mg in potato cultivation on an acid purple soil in Chongqing, China. The experiment included 8 treatments with equal P ra
为了加快建设覆盖全路范围的铁路地理信息可视化共享平台,着力解决多信息系统的管理,应用和集成,为各级领导、部门提供更加直观而丰富的信息,逐步达到建设“数字铁路”信息基础的目标,以提高铁路持续竞争力,铁道部于2001年8月对《全路地理信息系统总体设计与开发》项目进行了公开招标,招标工作由部科教司主持,评标专家组由路内外有关专家组成,铁科院电子所在8个单位参加的竞投标中脱颖而出,铁道部最终确定由铁科院电
An integrated remote sensing (RS) and geographic information system (GIS) technique was employed to characterize the spatial distribution of the risk of soil erosion by water on Latakia district, Syri
晋西北土地沙漠化已非常严重 ,沙漠已向我们逼近 ,自然和人为的因素 ,加剧了这一进程。沙漠化给人类带来了极大的危害 ,了解沙漠化 ,战胜沙漠这是我们的共同心愿
本文讨论了几种建立和优化ＡｕｔｏＣＡＤ工程设计环境的方法，以供利用ＡｕｔｏＣＡＤ进行工程设计的用户提高设计效率和进行二次开发时参考。
Based on the status quantity of water resources in Xi′an region, a commentary on many math models is given for water resources operation and management, and the visual model is provided to solve pract
Rhombus thinking, a new creative thinking method,is the combination of divergent thinking process and convergent thinking process,in which qualitative analysis is carried out before quantitative analy