<正> In recent years, studies show that coal formed during marine transigression process is also important in coal accumulation basin. Still, the characteristic
<正> Based on hydro-geological of Qilongcun landfill, the transportation mathematical model of leachat was established. The boundaries conditions and replenishm
<正> A power saving frequency difference controlling method was introduced by the double inverter and motor experiment system.The characters of the system under
<正> Through the usage of simulation software based on the network layout,airway resistances and parameters of main fans,ventilation calculations were performed
<正> Through the research on the model of the land reclamation in the refuse dumpof Heidaigou open coal mines,it was concerned that ecology was the theoretical