<正> Based on the deficiency of catalytic elements in methane sensors such as sintering,activity decrease and surface area reduction at high temperature, three
<正> Based on characteristic of the associated mining of multi-coal seam and the engineering geological characteristics of overburden,the mining impact pattern
<正> Focused upon the dynamic changing regularity and tendency of overburden movement and bed separation developing during the strip mining and stoping under ra
<正> Targeting at the coal seam with useful value discarded above goafs,attempted to explore the feasibility of'mining technique in the condition of floor f
<正>To overcome the subjectivity of experts in the process of risk response scheme selection, according to the theory of group decision making, a selection meth
<正> Based on the theory of geomechanics and using geologic analytical methods,analyed the fault characteristics, mechanical properties, displacement mode, tect