The theory and method of wavelet packet decomposition and its energy spectrum dealing with the coal-rock Interface Identification are presented in the paper. Th
An activated carbon with ash content less than ]0% and specific surface area more than 1600 m^2/g was prepared from cool and the effect of K-containing compound
Huainan area is an important coal base of the east of China. In the early part of the 1980s, the study of the underground waters dynamic state in the area was g