1. Department of Physics, Bhilai Institute of Technology Raipur, Chhattisgarh, India
2. Department of Physics, Govt. V. Y. T. PG. Auto. College Durg, Chhattisgarh, India
3. Department of Civil Engineering, Bhilai Institute of Technology Raipur, Chhattisgarh, India
4. Department of Applied Physics, The MS University Baroda, Vadodara, India