5α and 5β cholestane, ergostane, stigmastane, hopane, etc., as well as 4-methyl-5β-stigmastane have been identified in an Tertiary oil shale sample from the
Described in this paper is a double-decked vacuum giass isolating set built in the fire cracking instrument. It is characterized by high sensitivity and as bein
Summing up the abundant experience obtained by the author through many years of his work in mineral separation, an inversion formula has been proposed for calcu
According to the evolution of alkali elements (e.g. K, Na, Li) and the relationship among them in the melt-solution of pegmatitic magma the author has divided t