1. Department of Applied Sciences, School of Engineering, University of Petroleum and Energy Studies, Dehradun, India
2. Department of Electronics, G.B. Pant Institute of Engineering and Technology, Pauri Garhwal, India
3. Department of Physics, R.P. Degree College, Kamalganz, Farrukhabad, India
4. Department of Applied Sciences and Humanities, G.B. Pant Institute of Engineering and Technology, Pauri Garhwal, India