1. Department of Physics, Middle East Technical University, Ankara, Turkey
2. Department of Electric and Energy, Ahi Evran University, Kirsehir, Turkey
3. Department of Electrical and Electronics Engineering, Atilim University, Ankara, Turkey
4. Department of Machinery and Metal Technology, Ahi Evran University, Kirsehir, Turkey
5. Department of Physics Engineering, Hacettepe University, Ankara, Turkey
6. Department of Physics, Pamukkale University, Denizli, Turkey