1. Department of Physics, Government College University Faisalabad, 38000 Faisalabad, Punjab, Pakistan
2. Department of Industrial Engineering, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
3. London Centre for Energy Engineering (LCEE), School of Engineering, London South Bank University, 103 Borough Road, London SE1 0AA, U.K.