http://reply.papertrans.cn/1/85/8407/8407-31.png
Submitted on: 03 January 2013.
Revised on: 07 February 2013.
Accepted on: 18 March 2013.
___________________Energy Research & Social Science
Submitted on: 04 April 2017.
Revised on: 13 July 2017.
Accepted on: 05 August 2017.
___________________Energy Research & Social Science
http://reply.papertrans.cn/1/85/8407/8407-34.png
http://reply.papertrans.cn/1/85/8407/8407-35.png
Submitted on: 10 January 2021.
Revised on: 14 March 2021.
Accepted on: 11 April 2021.
___________________Energy Research & Social Science