1. Department of Environmental Science University of Mysore, Manasagangotri, Mysore-06, India
2. Nation Metal and Materials Technology Centre (MTEC), 14 Thailand Science Park, Paholythin Rd, Klong Laung, Pathumthani 12120, Thailand
3. Department of Aerospace Engineering Tokyo Metropolitan University, Tokyo 191-0065, Japan
4. Department of Physics University of Mysore, Manasagangotri, Mysore-06, India
5. Department of Geology University of Mysore, Manasagangotri, Mysore-06, India;, Email: kbyrappa@gmail.com