1. Department of Applied Physics and Telecommunications, Midlands State University, Gweru, Zimbabwe
2. Department of Electrical, Computer and Telecommunications Engineering, Botswana International University of Science and Technology, Palapye, Botswana
3. Department of Mechanical Engineering, College of Engineering, King Khalid University, Abha, Saudi Arabia
4. Department of Chemistry, Faculty of Science, King Khalid University, Abha, Saudi Arabia