open project(No.47549P0)of the State Key Laboratory of Scientific and Engineering Computing,Chinese Academy of Sciences;National Natural Science Foundation of China(Grant No.10872037);Natural Science Research Project of Henan Province(Grant No.2009A110017);Ministerio de Educación y Ciencia(Spain)(grant MTM2005-05573);Sabbatical Program(SAB2006-0070)of the Spanish Ministry of Education and Science