Huang: Male, born in 1963, China nationality, with no permanent residency abroad, Dr. materials physics, professor. He used to be an assistant engineer, engineer and senior engineer in the Department of Materials of Central South University. He is currently a professor-level senior engineer at the School of Materials Science and Engineering, Central South University. Now he is a member of China Mechanical Society Non-destructive Testing Society and China Scientific X-ray Diffraction User Association. 20 19 has been an independent director of the issuer since July.