Submitted on: 27 November 2017.
Revised on: 03 January 2018.
Accepted on: 24 January 2018.
___________________Green Materials---EMERALD GROUP PUBLISHING LTD
Submitted on: 10 December 2016.
Revised on: 09 February 2017.
Accepted on: 05 March 2017.
___________________Green Materials---EMERALD GROUP PUBLISHING LTD
http://reply.papertrans.cn/2/110/10940/10940-13.png
Submitted on: 20 April 2000.
Revised on: 21 July 2000.
Accepted on: 02 August 2000.
___________________Green Materials---EMERALD GROUP PUBLISHING LTD
http://reply.papertrans.cn/2/110/10940/10940-15.png
http://reply.papertrans.cn/2/110/10940/10940-16.png
http://reply.papertrans.cn/2/110/10940/10940-17.png
http://reply.papertrans.cn/2/110/10940/10940-18.png
Submitted on: 27 October 2006.
Revised on: 30 January 2007.
Accepted on: 20 February 2007.
___________________Green Materials---EMERALD GROUP PUBLISHING LTD
http://reply.papertrans.cn/2/110/10940/10940-20.png