C. I. Nwoye

Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria

I. E. Nwosu

Department of Environmental Technology, Federal University of Technology, Owerri, Nigeria

S. O. Nwakpa

Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria

J. U. Odo

Department of Metallurgical and Materials Engineering, Nnamdi Azikiwe University, Awka, Nigeria

S. E. Ede

Department of Metallurgical and Materials Engineering, Enugu State University of Science & Technology, Enugu, Nigeria

N. E. Idenyi

Department of Industrial Physics Ebonyi State University, Abakiliki, Nigeria