1. Materials Science Laboratory, Department of Physics, Faculty of Science, University of Maroua, Maroua, Cameroon
2. Department of Hydraulics and water management, National Advanced School of Engeneering of Maroua, University of Maroua, Maroua, Cameroon
3. Department of Electrical and Electronic Engineering, National Higher Polytechnic Institute, University of Bamenda, Bambili, Cameroon
4. Department of General and Scientifc Studies, IUT-FV Bandjoun, University of Dschang, Bandjoun, Cameroon