A bisphenol epoxy resin was used as modifier to increase the heat resistance of condensed poly-nuclear aromatic(COPNA) resin. The basic properties of COPNA resi
The authors of ’Genesis of the high gamma sandstone of the Yanchang Formation in the Ordos Basin, China’ questioned the viewpoint that high-gamma-ray sandston
In order to solve the problems of the fine division of sedimentary sequence cycles and their change in two-dimensional space as well as lateral extension contra