~ MMIE 2021 Keynote Speakers~ Prof. Zikang TANG, Director of Institute of Applied Physics and Materials Engineering, University of Macau (UM), China; Prof. William C. Tang (FInstP, FAIMBE), University of California, Irvine, USA.~MMIE 2021 Invited Speakers~ Prof. Junsong Chen, University of Electronic Science and Technology of China; Prof. Dewei Zhao, Sichuan University, China; Assoc. Prof. Jianwen Jiang (FRSC), National University of Singapore, Singapore.~ MMIE 2020 Speakers~~ PROF. ALAN LAU, SWINBURNE UNIVERSITY OF TECHNOLOGY, AUSTRALIA;~ PROF. LIHUI LANG, BEIHANG UNIVERSITY, CHINA;~ PROF. YONG SUK YANG, PUSAN NATIONAL UNIVERSITY, KOREA.**To get more information, please go to: http://www.mmie.org/speakers.html **Submission**Please submit your full paper & abstract via our Online Submission System (http://confsys.iconf.org/submission/mmie2021).Or please directly send your full paper & abstract to: This email address is being protected from spambots. You need JavaScript enabled to view it. **Publication**All accepted papers will be published in the Conference Proceedings, which is indexed by Ei Compendex, Scopus, Thomson Reuters (WoS), Inspec,et al. **Publication History**MMIE2020 - IOP Conference Series: Materials Science and Engineering-Vol.947. Indexed by Scopus.MMIE2019 - IOP Conference Series: Materials Science and Engineering-Vol.784. Indexed by Scopus.