Plumber's nightmare structure presents itself as an assemblage where all exits seem to converge inward -- a plumber's nightmare but an anticipated uniqueness for researchers, suggesting ...

A block of a graph is a maximal nonseparable subgraph. We show how the knowledge of block structure can be used to help solve the nonlinear 1-center problem on graphs which are more general than trees ...

Five boreholes were selected in the Gujiao block, Xishan, Taiyuan, China, as calibration wells to identify the coal structure. The geophysical-log responses of the coal structure in the No. 8 coal ...