1Beijing Institute of Technology, Rm 337, No. 1 Teaching Building, No. 5 Zhongguancun South Street, Haidian District, Beijing 100081, China
2University of Oklahoma, 202 W. Boyd St., Suite 219, Norman, OK 73019, United States
3Beijing Institute of Technology, Rm 343, No.1 Teaching Building, No. 5 Zhongguancun South Street, Haidian District, Beijing 100081, China
4Beijing Institute of Technology, No. 5 Zhongguancun South Street, Haidian District, Beijing 100081, China
5University of Oklahoma, 202 W. Boyd St., Suite 116, Norman, OK 73019, United States
6University of Oklahoma, 865 Asp Avenue, Felgar Hall, Rm. 306, Norman, OK 73019, United States