Affiliation: | 1.Department of Mechanical Engineering, Ahmadu Bello University, Zaria, Nigeria ;2.Department of Physics, Constantine the Philosopher University, 949 74, Nitra, Slovakia ;3.Faculty of Mathematics and Physics, Department of Physics of Materials, Charles University, Ke Karlovu 5, 121 16, Prague, Czech Republic ;4.Department of Materials Science, Faculty of Science, Chulalongkorn University, Bangkok, 10330, Thailand ;5.Department of Material Science and Engineering, University of Ghana, 77, Legon, Ghana ;6.Institute of Applied Science and Technology, University of Ghana, 25, Legon, Ghana ;7.Petrochemicals Divison, National Research Institute for Chemical Technology, Zaria, Nigeria ; |