Submitted on: 29 January 2014.
Revised on: 16 April 2014.
Accepted on: 12 May 2014.
___________________ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
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Submitted on: 10 July 2015.
Revised on: 16 August 2015.
Accepted on: 08 October 2015.
___________________ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
Submitted on: 14 August 2003.
Revised on: 17 September 2003.
Accepted on: 13 October 2003.
___________________ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING