<正> Shenfu coal was extracted with 0S2,n-hexane,benzene sequentially.The ex- tracts were analyzed with GC/MS.It is presented that group seperation of soluble o
According to the characteristics of the shock bump due to roof fall, a simple mechanics model has been established by applying the catastrophic theory and the l
In order to increase the exploration depth of Rayleigh wave, new idea that different from the former principles in data acquisition was applied. Suitable data a
<正> In this paper, the configuration characteristic of the safe parameter measurement and alarm system in new type mine was first simply introduced, which is m