At EOS/ESD meeting,  Portland, Oregon, USA. Sep. 10-14, 2001

4th Inter. Conference on Applied Electrostatics,  Dalian, China, Oct.8-12,2001

1st Inter. Conference on Applied Electrostatics,  Beijing, China, 1988

 Annual meeting of Beijing Electrostatic Society, 1987

With Dr.M. Horenstein, Chairman of Eelectrostatics Society of American at University of Boston, Sep. 2001

With Dr.T. B. Jones, Editor of Journal of Electrostatics in 4th Inter. Conference on Applied Electrostatics,  Dalian, China, Oct.8-12,2001

With Dr. Jim, Professor of University of Missouri-Rolla, 2002

With Dr. Pommerenke, Professor of University of Missouri-Rolla,2002