Taking Xi′an ground fissures as an example, the effectiveness of resistivity method in surveying ground fissures and the depth of detection of DCelectricalmethod are discussed.
以西安地裂缝为例，探讨了电阻率法勘察地裂缝的应用效果及直流电阻率法的勘探深度问题。
2
The method of finite state machine together with PWM circuit is given to realize the algorithms of Voltage Space Vector control and 120 electrical Angle changing phase control of DC brushless motor.
The traditional method of DCelectrical survey is applied to search for water sources in the groundwater study and achieves better effect in confirming exploitation quantity of groundwater.