通过对顶板断在煤壁里的机理分析和试验，采用了“煤壁支座加采场支柱支座”的方法解释了“放顶煤开采矿压小”的现象，研究了采高与矿......

This paper presents a model of isotopic fractionation by freezing under near equilibrium conditions in an open system a......