See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/273135540 JOURNAL OF SCIENCE, ENGINEERING & TECHNOLOGY Article · March 2012 CITATIONS 0 READS 63 5 authors, including: Godwin Okon Rivers State University of Science and Technology 25 PUBLICATIONS 6 CITATIONS SEE PROFILE All content following this page was uploaded by Godwin Okon on 06 March 2015. The user has requested enhancement of the downloaded file. All in-text references underlined in blue are linked to publications on ResearchGate, letting you access and read them immediately.