1. School of Physics and Technology
2. University of Jinan
3. P. R. China
4. Institute of Plasma Physics
5. Chinese Academy of Sciences
6. School of Chemical and Environmental Engineering
7. Wuyi University
8. Jiangmen 529020
9. China
10. 230031 Hefei
11. School of Environmental Science and Engineering
12. North China Electric Power University
13. Beijing 102206
14. PR China