supported by the National Natural Science Foundation of China (No. 30740095, 30840085);Research Fund for the Doctoral Program of Higher Education of China (No. 20060114004);the Science Foundation of Key Laboratory in Shanxi Province,China (No. 2009011059-8, 200603012)
supported by the National Natural Science Foundation of China(No.30740095No.30840085);the Specialized Research Fund for the Doctoral Program of Higher Education in China(No.20060114004)