1. School of Electronic and Information Engineering Chongqing Three Gorges University Wanzhou 404000 Chongqing China
2. Chongqing Key Laboratory of Geological Environment Monitoring and Disaster Early-warning in Three Gorges Reservoir Area Chongqing Three Gorges University Wanzhou 404000 Chongqing China
3. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of Technology 730050 Lanzhou China
4. Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics 621900 Mianyang Sichuan China