1. Faculty of Electrical Engineering and Communication, Physics Department; Brno University of Technology, Technická 8; Brno 616 00 Czech Republic
2. Faculty of Mechanical Engineering, Department of AET, Discipline of Descriptive Geometry and Engineering Graphics; Technical University of Cluj-Napoca, 103-105 B-dul Muncii St; Cluj-Napoca Cluj 400641 Romania
3. Department of Physics, Science and Research Branch; Islamic Azad University; Tehran Iran