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质数的分布规律
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作者 李保明 《焦作大学学报》 2001年第4期45-46,共2页
通过对自然数的整除性进行分析、概括、研究 ,得出了质数的分布规律 ,并由质数的分布规律 。
关键词 质数 分布规律 相对均匀 整数 自然数 质数分布表
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FEM Edge Effect and Capacitance Evaluation on Cylindrical Capacitors
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作者 Jose-M. Bueno-Barrachina Cesar-S. Cafias-Penuelas Saturnino Catalan-Izquierdo 《Journal of Energy and Power Engineering》 2012年第12期2063-2069,共7页
The purpose of this paper is to show the influence of the edge-effect on the electric field distribution, and hence on the inner capacitance and outer capacitance of a cylindrical capacitor surrounded by an insulating... The purpose of this paper is to show the influence of the edge-effect on the electric field distribution, and hence on the inner capacitance and outer capacitance of a cylindrical capacitor surrounded by an insulating medium. To generalize the results, a two-dimensional axisymmetric finite element model of a cylindrical capacitor has been generated and the problem has been resolved taking into account the distance between the conductors for a complete set of dimensions. The available obtained results have been compared with previous published works. Finally, using statistical tools, the mathematical expression for computing the relationship between capacitance and insulation gap and cylindrical plates dimensions has been obtained. 展开更多
关键词 CAPACITANCE electric field effects SIMULATION space charge.
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