Proceedings of the Eighth International Vacuum Congress, September 22-26, 1980, Cannes, France / Proceedings of the Ninth International Vacuum Congress and Fifth International Conference on Solid Surfaces : Proceedings of the Seventh International Vacuum Congress and the Third International Conference on Solid Surfaces : Proceedings of the 6th international congress of Chinese Mathematicians Proceedings of the 6th international congress of chinese mathematicians Proceedings of the 6th international modal analysis conference / Proceedings of the 7th international modal analysis conference / Proceedings of the eighth International Congress on Industrial and Applied Mathematics Proceedings of the 6th international congress of chinese mathematicians．Vol.1．第Ⅰ卷