1. College of Physics Science and Technology, Hebei University, Baoding 071002, China
2. School of Mathematics and Physics, Handan University, Handan 056005, China
3. Institute of Life Science and Green Development, Hebei University, Baoding 071002, China
4. Department of Mathematics and Physics, North China Electric Power University, Baoding 071003, China
5. College of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China