August  20th, 2011, Professor Michael L. Cherry, chair of the Department of  Physics and Astronomy, Louisiana State University paid a formal visit to  Purple Mountain Observatory. Dr. YANG Ji, director of PMO hosted the  receiving meeting.

Vice chair Dr.   GAN Weiqun　briefed Dr. Cherry about the history and current situation  of PMO, mainly introduced to him the key researches here under going at  PMO. Dr. YANG Ji , Dr. CHANG Jin, and Dr. Cherry had extensive  communication regarding the deep-field exploration and high-energy  detection projects. They also had preliminary discussion about possible  cooperation in the future.

Accompanied by  Dr. CHANG Jin, Cherry looked around the key laboratory of Dark Matter  and Space Astronomy, PMO, saw the latest development of the Dark Matter  Particle Detector.