1. Taiyuan University of TechnologyCollege of Electrical and Power Engineering No. 79 Yingze West Street Taiyuan 030024 China
2. Wuyi UniversitySchool of Biotechnology and Health Sciences No. 22 dongcheng village Jiangmen 529020 China (S. Jiang
3. National Institute of MetrologyDivision of Nanoscale Measurement and Advanced Materials No. 18, Bei San Huan Dong Lu, Chaoyang Dist Beijing 100029 China
4. Taiyuan University of TechnologyKey Laboratory of Coal Science and Technology No. 79 Yingze West Street Taiyuan 030024 China