1. Department of Chemical, Metallurgy and Materials Engineering, Tshwane University of Technology, Pretoria 0183, South Africa
2. Department of Industrial Engineering, Operations Management and Mechanical Engineering, Vaal University of Technology, Vanderbijlpark 1900, South Africa
3. École Supérieure d’Ingénieurs en Électrotechnique et Électronique, Noisy-le-Grand, 93160 Paris, France
4. Department of Electrical Engineering, Tshwane University of Technology, Pretoria 0183, South Africa
5. Department of Civil Engineering, Tshwane University of Technology, Pretoria 0183, South Africa
6. Department of Mechanical Engineering, Tshwane University of Technology, Pretoria 0183, South Africa