Institution: | HE AI-SHENG, ZHANG JIN-CANG, FENG ZHENG-HE LU DA-RONG(HE YU-SHENG (Department of Physics, Tsinghua University, Beifing 100084, PRC) *Visiting Scholar, North University of Technology, Beijing 100041, PRC. **Visiting Scholar, Henan Normal University, Xinxiang 453002, PRC. |