In the morning of December 12, 2023, Mr. Linxiang Lyu successfully passed his PhD research proposal exam. The title of his proposal is “Assessing the changes and impacts of disposable face masks in the environment: A step towards sustainable materials and eco-friendly products”. His profound knowledge and excellent presentation helped him win a good evaluation from the external examiner, Dr. Yaser Khojasteh-Salkuyeh, and other examining committee members (Drs. Joonhee Lee, Zhi Chen, Monisha Bagchi, and Chunjiang An).