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超长等位梯度变量接地电阻测量法
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作者 陈宇豪 武建洁 《东北水利水电》 2011年第10期64-65,共2页
接地电阻一般指接地体上的工频交流或直流电压与通过接地体而流入地下的电流之比。文章在介绍常用的接地种类的基础上,根据实际工作经验,为解决特殊情况下接地电阻测试问题,总结出超长等位梯度变量接地电阻测量法。
关键词 变量接地 电阻测量 方法
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Geomagnetic Field Measurement over Akure Using Ground Based Magnetometer Observatory
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作者 Jacob Oloketuyi Babatunde Rabiu +2 位作者 Sola Fayose Theophilus Ewetumo Olawale R Bello 《Journal of Earth Science and Engineering》 2014年第12期770-791,共22页
The geomagnetic field over Akure, southern Nigeria (7°15' N; 5°12' E) was investigated from direct observation for a period of two years (2005-2006). Geomagnetic field over Akure was monitored and meas... The geomagnetic field over Akure, southern Nigeria (7°15' N; 5°12' E) was investigated from direct observation for a period of two years (2005-2006). Geomagnetic field over Akure was monitored and measured using a locally produced magnetometer. The geomagnetic data generated were evaluated at every local time hour. Diurnal, monthly and Seasonal effects were investigated. The results of the analyses from the magnetic data generated provide a comprehensive understanding of the geomagnetic variation over the region. This research validates the instrument and presents a direct measurement opportunity to capture the influence of local sources. 展开更多
关键词 Magnetic field MAGNETOMETER ionosphere.
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