1. Doctoral School of FIMM, National University of Science and Technology POLITEHNICA of Bucharest, 060042 Bucharest, Romania
2. Railway Vehicles Department, National University of Science and Technology POLITEHNICA of Bucharest, 060042 Bucharest, Romania
3. Renewable Sources and Energy Efficiency Department, National Institute for Research and Development in Electrical Engineering ICPE-CA, 030138 Bucharest, Romania