Test and Research of Total Quantity of N and P Fertilizers for Maize

Objective] The alm was to provide scientific references for determination of optimal N and P quantities of malze. [Method] The research conducted a test in field to expIore the effects of N and P fertiIizers on malze yield. [Result] Both of N and P fertiIizers have significant effects on malze yield. When malze yield reached the highest, the quantities of N fertiIizers and P fertiIizers were 530.56 and 105.44 kg/hm2, respectiveIy. [Conclusion] Malze yield keeps growing upon N or P fertiIizers to certaln extent, and excessive quantities of N and P fertiIizer wouId reduce malze yield.

特殊土壤情况下HVDC输电线路单极模式运行时的地表电位计算

高压直流输电线路(HVDC)单极经大地回路运行产生的地表电位分布对交流输电系统有负面影响。实际情况下的土壤结构是非常复杂的。本文阐述运用目前国内外接地计算较多采用的CDEGS软件包中的MALZ模块对复杂土壤模型进行计算,分析湖泊、大型金属管道等对电位分布的影响,以总结其对地表电位分布的影响规律。

引外接地技术在冷湖赛什腾山天文观测基地网设计中的应用分析

针对冷湖赛什腾山天文观测基地的接地网设计问题,结合赛什腾山地区特殊的地质、地形条件,对引外接地技术从适用性、经济性等方面进行了分析和总结,通过CDEGS软件对引外接地进行了仿真分析和验证,发现引外接地技术能有效降低冷湖赛什腾山天文观测基地C区接地网的接地电阻值,在赛什腾山天文观测基地网设计中可以先予考虑。