Submitted on: 11 June 2003.
Revised on: 25 July 2003.
Accepted on: 12 September 2003.
___________________Cleaner Environmental Systems---ELSEVIER
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http://reply.papertrans.cn/1/56/5504/5504-33.png
Submitted on: 28 February 2012.
Revised on: 22 March 2012.
Accepted on: 17 May 2012.
___________________Cleaner Environmental Systems---ELSEVIER
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Submitted on: 15 October 2021.
Revised on: 29 January 2022.
Accepted on: 16 February 2022.
___________________Cleaner Environmental Systems---ELSEVIER