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Submitted on: 08 October 2003.
Revised on: 25 October 2003.
Accepted on: 14 November 2003.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
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http://reply.papertrans.cn/3/276/27598/27598-34.png
Submitted on: 31 July 2002.
Revised on: 10 August 2002.
Accepted on: 22 August 2002.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
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