Concentrated Point Defects in and Order-Disorder Transition...............................51

In this paper, we will give a detailed introduction the the topology of the SCGrid – a computational grid established by the Supercomputing Center of the Chinese Academy of Sciences (SCCAS). The SCGrid collects computing capabilities of SCCAS and the Shanghai Supercomputing Center(SSC). The SCGrid interconnection between the two supercomputing centers enables SCGrid users with convenient use of any kind of computing capabilities provided, including the computation intensive service, the computation visualization service, the data storage service and some special computation services such as computations in bioinfomatics. After a brief introduction of the function modules of middle-ware of the SCGrid, we will focus on the issues involved in building the SCGrid and the interconnection between the two supercomputing centers. Several interdisciplinary applications are operating on the SCGrid.