1. Department of Physics, Zonguldak Karaelmas University, 67100, Zonguldak, Turkey.
2. Corresponding author. E-mail: dadayli@elmas.bim.karaelmas.edu.tr Fax: 01090 03722572070.
3. Department of Physics Engineering, Hacettepe University, 06532, Beytepe, Ankara, Turkey.
4. Department of Food Engineering, Hacettepe University, 06532, Beytepe, Ankara, Turkey.