Dr. Yuhua Duan, DOE-National Energy Technology Laboratory, Pittsburgh, PA 15236, USA
E-mail: yuhua.duan@netl.doe.gov

Dr. Ahmed Hashim Mohaisen Al-Yasari, Department of Physics, College of Education For Pure Science, University of Babylon, Hilla, IRAQ
E-mail: ahmed_taay@yahoo.com

Dr. Dachepalli Ravinder, Department of Physics, Osmania University, Hyderabad, India
E-mail: ravindergupta28@rediffmail.com