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机械学院报告——Mechanical and Mathematical Properties of Quasicrystals

发布日期:2017-11-29 作者:机械工程与力学学院

亿万先生官网网址域名链接:本次比赛由公管学院八个班级组成的八支参赛队伍参加。凭借着钻研精神,杨亦鸣带领团队接连斩获国家级教学成果一等奖、国家科技进步二等奖、第四届中国高校人文社会科学奖等重大奖项,先后在国际语言学、脑科学、心理学、认知科学等顶级刊物发表100余篇重要学术论文,赢得了国内外学界的充分肯定。  我校校报自创刊以来一直秉承宣传党的教育方针、反映师生员工心声的办报宗旨,始终坚持正确的舆论导向,坚持办报育人。。

2017年12月5日,星期二,10:00AM
绣山工程大楼208室
Mechanical and Mathematical Properties of Quasicrystals
W?odzimierz Domański
Military University of Technology, Warsaw, Poland
Abstract
  The discovery of quasicrystals in 1984 by D. Shechtman, destroyed the fundamental concepts of crystallography which relied on a traditional definition of the crystal as a periodic arrangement of identical unit cells. In his experiments with a rapidly cooled Al-Mn alloy, Shechtman obtained a sharp diffraction pattern with a rotational symmetry incompatible with periodicity. His findings forced the International Union of Crystallography to redefine the notion of the crystal as any solid having discrete diffraction diagram. Quasicrystals are a new class of materials which thanks to their unique properties such as electrical, optical, hardness and nonstick features are finding new and promising applications, e.g. in nonstick coatings, thermal barriers, infra red sensor etc. Two decades after the first publication on quasicrystals, a soft quasicrystal was found in nature and a number of materials including liquid crystals, polymers, nanoparticles and colloids enriched the family of soft quasicrystals, enhancing the potential applications of these quasi-periodic structures.
  In my talk I will present a brief history of the discovery of quasicrystals and I will discuss some of the fascinating mechanical and mathematical properties of quasicrystals. In particular I will focus on elastic constitutive relations in which besides the phonon space there is also a contribution from the phason space. I will present the form of the energy density function in some of these quasi-periodic structures. Recent findings of natural quasicrystals will also be mentioned.


Biography
Education
? 1979, M.S. in Mathematics, Department of Mathematics, Warsaw University, Poland;
? 1988, Ph. D. in Solid Mechanics, Institute of Fundamental Technological Research, Polish Academy of Science, Warsaw, Poland;
? 2008, Habilitation in Solid Mechanics, Institute of Fundamental Technological Research, Polish Academy of Science, Warsaw, Poland.
Working Experience
? 1980 - 2008 Assistant/Senior Assistant/Assistant Professor, Institute of Fundamental Technological Research, Polish Academy of Science, Warsaw, Poland;
? 1989 - 1990 Fulbright Postdoctoral Fellow, Department of Mathematics and Program in Applied and Computational Mathematics, Princeton University, USA;
? 1990 - 1991 Visiting Assistant Professor, Department of Mathematics and Statistics, University of Nebraska Lincoln, USA;
? 2001 - 2002 Visiting Associate Professor, Department of Mathematics and Statistics, University of Massachusetts, Amherst, USA;
? 2008- Professor of the Military University of Technology, Warsaw, Poland.


宁波大学力学学科系列报告
Lecture Series on Mechanics, Ningbo University
更多信息: 王骥,wangji@nbu.edu.cn