1. Department of Physics, Anhui Normal University , Wuhu 241002, China
2. School of Astronomy and Space Science, Nanjing University , Nanjing 210023, China
3. Department of Physics and Electronic Engineering, Nanyang Normal University , Nanyang 473061, China
4. Henan Engineering Research Center of Service and Guarantee for Intelligent Emergency, Nanyang Normal University , Nanyang 473061, China