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Submitted on: 15 January 2005.
Revised on: 18 March 2005.
Accepted on: 28 April 2005.
___________________Ain Shams Engineering Journal---ELSEVIER
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Submitted on: 03 September 2018.
Revised on: 19 December 2018.
Accepted on: 05 February 2019.
___________________Ain Shams Engineering Journal---ELSEVIER
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Submitted on: 12 October 1999.
Revised on: 04 January 2000.
Accepted on: 24 February 2000.
___________________Ain Shams Engineering Journal---ELSEVIER