K.M. Gupta is a professor in the Department of Applied Mechanics, Motilal Nehru National Institute of Technology, Allahabad, India where he teaches materials science, engineering mechanics, thermodynamics of materials, electrical and electronic materials. He has more than 38 years of teaching, research and consultancy experience and obtained PhD from the University of Allahabad. He has authored 28 books and edited 2 books on Engineering subjects as well as 110 research papers in peer-reviewed Journals. Nishu Gupta is a research scholar in the department of Electronics and Communication Engineering, Motilal Nehru National Institute of Technology, Allahabad, India. He received his M.Tech. degree in Nanoscience and Technology from Delhi Technological University. Prior to starting his current position, he served as a software engineer with Infosys Technologies limited, and has senior software engineer at Tech Mahindra. His research interests are in the fields of semiconductor devices, hybrid solar cells, photonics, nano-optics and related fields.