1. School of Metallurgy and Materials Engineering, College of Engineering, University of Tehran, Tehran 13145-1318, Iran
2. Electrical Engineering and Information Technology Department, Ruhr-University Bochum, Bochum 44801, Germany
3. Department of Electrical and Computer Engineering, North Carolina State University, Raleigh, North Carolina 27695, United States
4. Catalyst Research Center, Chem. Eng. Dept., Razi University, Kermanshah 67144-14791, Iran