Numerical Simulation of 3-dimensional ElectrostaticField Model in a Fluid-filled Borehole
kang tong 1; 2 ; liang guo-ping 2; dou hai-yong 3 (1.information and engineering school; beijing broadcasting institute; beijing 100024; 2.academy of mathematics and system sciences; chinese academy of sciencesk; beijing 100080; 3.deparment of applied mathematics; tsinghua university; beijing 100080)