Mohammed El Hadi Attia
Department of Physics, Faculty of Science, University of El Oued, 39000 El Oued
Algeria

Zied Driss
Laboratory of Electro-Mechanic Systems (LASEM), ENIS, University of Sfax, TUNISIA
Tunisia

Abderrahmane Khechekhouche
Laboratory of Electro-Mechanic Systems (LASEM), ENIS, University of Sfax, TUNISIA
Algeria