[Academic] FW: Seminar Friday

[Catherine Cheshire]

Dear All

Please see below details of seminar that might be of interest to you.

Catherine.


From: einar.steingrimsson at gmail.com [mailto:einar.steingrimsson at gmail.com] On Behalf Of Einar Steingrimsson
Sent: 15 May 2012 13:35
To: Catherine Cheshire
Subject: Seminar Friday

Dear Catherine,

I wonder if you could forward this to academics in the Physics department, or else tell me whom I should contact for that.

The  Department of CIS hosts a seminar on Friday that might be interesting to some in chemistry, physics and applied mathematics.  An abstract follows below.  The talk is 2-3PM in Livingstone Tower, Room 14.15.

Best wishes,

Einar Steingrimsson
Professor
Department of Computer and Information Sciences

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   The Law of Aboav--Weaire and its analogue in three dimensions
                   Richard Ehrenborg
              University of Kentucky, USA
                2 p.m., Friday, 18 May
               Livingstone Tower 14.15

Abstract: When investigating the structure of metals it is known that the atoms lie in a lattice structure. However, the lattice property only holds locally, that is, in a three dimensional cell called a grain. Bordering the grain is a boundary where the atoms lie chaotically, and beyond that is a new grain where the lattice has a different orientation. The structure of these grains amounts to a three dimensional simple subdivision of space.

Looking at the two dimensional analogue, one observes that grains with a small number of sides tend to be surrounded by grains with a large number of sides, and vice versa. The Law of Aboav--Weaire states that the average number of sides of the neighbors of an n-sided grain should be roughly 5+6/n. By introducing the correct error term we prove this law of Material Science and discuss its extension to three dimensions.

This is joint work with Menachem Lazar and Jeremy Mason. Moreover, selected work of von Neumann, MacPherson and Srolovitz will be presented.


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