Study on migration instability characteristics and mine pressure control of roof overburden rock in thin coal seams mining.

In the Guxu mining area, the mining of thin coal seams is complicated by the unknown migration structure of the roof overburden and severe mine pressure. Based on this, taking the 1599 working face as the research background, and using a method that combines theory with simulation, starting from the structural fracture of roof overburden rock in thin coal seams, the roof failure characteristics during the mining process are studied, and the roof caving shape and stress distribution characteristics under the influence of mining speed are studied is explored. The research results show that a cantilever beam with a short length forms in the overburden rock of the soft bedrock roof during thin coal seams mining.

Novel low-melting salts with donor-acceptor substituents as targets for second-order nonlinear optical applications.

We synthesized several novel low-melting ionic salts with donor-acceptor substituents and investigated their possible applications as second-order nonlinear optical materials.