1. State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of Technology Tianjin 300401 China
2. Tianjin Key Laboratory of Bio-electromagnetic and Neural Engineering Hebei University of Technology Tianjin 300132 China
3. Hebei Key Laboratory of Bioelectromagnetics and Neuroengineering School of Health Sciences and Biomedical Engineering Hebei University of Technology Tianjin 300132 China
4. School of Electrical Engineering Hebei University of Technology Tianjin 300401 China
5. Nanotechnology and Integrated Bioengineering Centre University of Ulster Jordanstown Campus Newtownabbey BT37 0QB UK