Numerical study of random superconductors
The XY model with quenched random disorder is studied numerically at T ¼ 0 by a defect scaling method as a model of a disordered superconductor. In 3D we find that, in the absence of screening, a vortex glass phase exists at low T for large disorder in 3D with stiffness exponent h �þ 0:31 and with finite screening and in 2D this phase does not exist. For weak disorder, a superconducting phase exists which we identify as a Bragg glass. In the presence of screened vortex– vortex interactions, the vortex glass does not exist but the Bragg glass does. 2004 Elsevier B.V. All rights reserved.
The similarity and difference of regional distributions between management science publication and NSFC's management science fund are compared. Two scientometric models rank-frequency distribution and concentration measurement are used to show whether or not the amount of grants awarded to different provinces by the National Natural Science Foundation of China (NSFC) match with the research capacity of given provinces as indicated by its management science publication