1. Department of Electrical Engineering, Tshwane University of Technology, Pretoria, South Africa
2. French South African Institute of Technology (F’SATI), Pretoria, South Africa
3. Centre for Atmospheric Research, National Space Research and Development Agency, Anyigba, Nigeria
4. École Supérieure d’Ingénieurs en Électrofgitechnique et Électronique, Noisy-Le-Grand, France
5. Department of Chemical, Metallurgy and Material Engineering, Tshwane University of Technology, Pretoria, South Africa