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Submitted on: 18 April 1998.
Revised on: 01 August 1998.
Accepted on: 22 September 1998.
___________________Iranian Journal of Science and Technology-Transactions of Mechanical Engineering
Submitted on: 27 February 2007.
Revised on: 14 May 2007.
Accepted on: 11 July 2007.
___________________Iranian Journal of Science and Technology-Transactions of Mechanical Engineering
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