1. International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China
2. Department of Physics Tamkang University New Taipei City 25137 Taiwan
3. Institute of Physics Chinese Academy of Sciences Beijing 100190 China
4. National Synchrotron Radiation Research Center Hsinchu 30010 Taiwan
5. School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an 710049 China