A metal-organic coordination polymer formulated as [Ni(cbba)2(bipy)(H2O)2]n 1 (H2cbba = 2-(4-chlorine-benzoyl]benzoic acid, bipy = 4,4-bipyridine) has been hydr
Gateways at faces of great mining heights are mostly driven along the roof of coal seams. For gateway height restrictions, a 1-3 m floor coal is retained, leavi