1. ENSTIB, LERMaB, Epinal, France;
2. Applied Physic Laboratory, Higher Teacher Training College, Yaoundé, Cameroon;
3. Department of Mechanical Engineering, University of New Brunswick, Fredericton, NB, Canada;
4. Laboratory of Energy, University of Douala University Institute of Technology, Douala, Cameroon;
5. Laboratory of Chemical Engineering, Department of Applied Chemistry, University of Liège, Liège, Belgium;
6. LERMaB Faculty of Sciences and Techniques, University of Lorraine, Vandoeuvre-les-Nancy, France;
7. LERMaB, University of Lorraine, Epinal, France