12月5日下午，机械学院力学学科邀请波兰华沙董布罗夫斯基军队技术学院Domanski教授到学院做学术交流，并做学术报告：Mechanical and Mathematical Properties of Quasicrystals。报告在学院208会议室举行，王骥副院长主持，学院老师和同学聆听了本次报告。

Wlodzimierz Domanski教授介绍在准晶方面的工作，大家很有兴趣。他来过两次中国，每次都是杭州。

准晶作为一种新型的材料，由于它有优良的电学、光学、硬度等性质，使它与众不同，并有广阔的应用前景。报告最后，在场师生与Domanski教授就有关问题进行了讨论。

 

Mechanical and Mathematical Properties of Quasicrystals

Włodzimierz 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.