On the afternoon of December 3, the 39th lecture of the 22nd "East Evolution Forum" of the School of Physical and Electronic Science was held in the lecture Hall 301, Zone D, Wenyuan Building, Changqing Lake Campus. Professor Xu Ning from the University of Science and Technology of China is specially invited to give a speech at the "Eastern Forum". Vice President Song Yuzhi presided over the lecture and presented the "East Dixie Forum" trophy to the guests. Nearly 100 teachers, graduate students and undergraduates of related majors participated in the activity.

Professor Xu Ning gave an academic report entitled "Stability of amorphous solids". He first introduced the elastic-plastic deformation response of amorphous solids under applied pressure, shear, self-driven and other loads. The plastic deformation results from the instability of amorphous solids, which leads to irreversible structural restructuring of solids and material damage. Due to the disordered structure of amorphous solids and the defects everywhere, crystal fracture is often triggered by defects, so it is very challenging to explore the formation mechanism of load instability and predict the key regions that trigger plastic deformation. Then, Professor Xu Ning introduced in detail the key factors that determine the stability of amorphous solids through the characterization of the structure and intrinsic vibration characteristics of the amorphous solids, established the physical image of the stability of the amorphous solids from the perspective of intrinsic vibration characteristics, found two different types of load instability, and revealed their respective formation mechanisms. After the report, Professor Xu Ning communicated and interacted with the teachers and students on site, and patiently answered the questions raised by teachers and students in detail, deepening the breadth and depth of the academic exchange. The report was warmly welcomed by teachers and students.

Xu Ning is a professor at the University of Science and Technology of China and Vice President of the College of Future Technology. He received his Ph.D. from Yale University in December 2005, and did postdoctoral research at the University of Pennsylvania and the University of Chicago from January 2006 to July 2009. He was a research Assistant Professor at the Chinese University of Hong Kong from July 2009 to January 2010, and has been teaching at the School of Physics at the University of Science and Technology of China since January 2010. He has been engaged in basic research in the field of soft condensed matter physics for a long time. His main research contents include soft matter amorphous liquid-solid transition, amorphous solid properties, crystallization melting, non-equilibrium statistical physics, mechanical metamaterials and other basic physics problems. He has published 67 SCI papers in academic journals, including Nature and sub-journals, PNAS, Science Advances, Physical Review Letters, etc. He has been funded by the National Natural Science Foundation of China Outstanding Young People Science Fund, selected as the leading talent of the National High-level Talent Special Support Program, the National tens of Millions of Talents Project, and enjoys special government subsidies.