In 1958, Chun and Kuang described Cathaya Chun & Kuang as a new genus of Pinaceae.They included one fossil species, C.loehri (Engelh.& Kink.) Chun & Kuang and two extant species, C.argyrophylla Chun & Kuang and C.nanchuanensis Chun & Kuang.Under Art.40.1 of the Shenzhen Code, they did not validly publish Cath
Mechanism of deformation and pressure relief control of dynamic gob-side entry surroundings in fully-mechanized caving mining for extra-thick coal seam
Affected by the superposition of working face mining, strong rock pressure phenomena such as rock burst and large deformation easily occur in the gob-side entry when mining extra-thick coal seams.Taking Porcelain Heart the extra-thick coal seam mining of Caojiatan Coal Mine in Yushen Mining Area as the engineering background, the appearance mechani