In the afternoon of April 19, 2023, Mr. Zhikun Chen successfully passed his PhD research proposal exam. The title of his research proposal is “Entrainment and enrichment of microplastics in ice formation processes”. His profound knowledge and excellent presentation helped him win a good evaluation from the external examiner, Dr. Xianming Zhang, and other examining committee members (Drs. Zhi Chen, Fuzhan Nasiri, Maria Elektorowicz, and Chunjiang An.