Submitted on: 15 April 2001.
Revised on: 25 May 2001.
Accepted on: 12 June 2001.
___________________Chinese Journal of Mechanical Engineering
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Submitted on: 25 November 2003.
Revised on: 30 January 2004.
Accepted on: 25 February 2004.
___________________Chinese Journal of Mechanical Engineering
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Submitted on: 08 April 2008.
Revised on: 03 May 2008.
Accepted on: 01 June 2008.
___________________Chinese Journal of Mechanical Engineering
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Submitted on: 10 August 2000.
Revised on: 31 August 2000.
Accepted on: 25 September 2000.
___________________Chinese Journal of Mechanical Engineering
Submitted on: 05 January 2004.
Revised on: 01 February 2004.
Accepted on: 07 March 2004.
___________________Chinese Journal of Mechanical Engineering