Funding for this research was provided by:
Energiforsk (Fj?rrsynsprojekt 5334)
National Key Basic Research Program of China (No. 2013CB228305)
Natural Science Foundation of Shandong (Project ZR2014EEM025)
Article History
Received: 20 October 2018
Revised: 29 December 2018
Accepted: 3 January 2019
First Online: 14 January 2019