Thu, 06 Nov 2003

14:00 - 15:00
Rutherford Appleton Laboratory, nr Didcot

Robust numerical methods for computer aided process plant design

Dr Eric Fraga
(UCL)
Abstract

The process industries are one of the UK's major sectors and include

petrochemicals, pharmaceuticals, water, energy and the food industry,

amongst others. The design of a processing plant is a difficult task. This

is due to both the need to cater for multiple criteria (such as economics,

environmental and safety) and the use highly complex nonlinear models to

describe the behaviour of individual unit operations in the process. Early

in the design stages, an engineer may wish to use automated design tools to

generate conceptual plant designs which have potentially positive attributes

with respect to the main criteria. Such automated tools typically rely on

optimization for solving large mixed integer nonlinear programming models.

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This talk presents an overview of some of the work done in the Computer

Aided Process Engineering group at UCL. Primary emphasis will be given to

recent developments in hybrid optimization methods, including the use of

graphical interfaces based on problem specific visualization techniques to

allow the engineer to interact with embedded optimization procedures. Case

studies from petrochemical and water industries will be presented to

demonstrate the complexities involved and illustrate the potential benefits

of hybrid approaches.

Tue, 16 Nov 2010

14:30 - 15:30
L3

Triangles in tripartite graphs

John Talbot
(UCL)
Abstract

How many triangles must a graph of density d contain? This old question due to Erdos was recently answered by Razborov, after many decades of progress by numerous authors.

We will consider the analogous question for tripartite graphs. Given a tripartite graph with prescribed edges densities between each

pair of classes how many triangles must it contain?

Fri, 03 Dec 2010
14:30
DH 3rd floor SR

tba

Liora Malki
(UCL)
Tue, 20 Jan 2009

14:30 - 15:30
L3

Vertex Turan problems in the hypercube

John Talbot
(UCL)
Abstract
Let $Q_n=\{0,1\}^n$ be the $n$-dimensional hypercube. For $1\leq d \leq n$ and $F\subseteq Q_d$ we consider the question of how large $S\subseteq Q _n$ can be if every embedding $i:Q_d\to Q_n$ satisfies $i(F)\not\subseteq S$. We determine the asymptotic behaviour of the largest $F$-free subsets of $Q_n$ for a variety of $F$, in particular we generalise the sole non-trivial prior result in this area: $F=Q_2$ due to E.A. Kostochka. Many natural questions remain open. This is joint work with Robert Johnson.
Thu, 05 Mar 2009

16:30 - 17:30

Free surface flows in the presence of electric fields

Jean-Marc Vanden-Broeck
(UCL)
Abstract

GIBSON BUILDING COMMON ROOM 2ND FLOOR

(Coffee and Cakes in Gibson Meeting Room - opposite common room)

The effects of electric fields on nonlinear free surface flows are investigated. Both inviscid and Stokes flows are considered.

Fully nonlinear solutions are computed by boundary integral equation methods and weakly nonlinear solutions are obtained by using long wave asymptotics and lubrication theory. Effects of electric fields on the stability of the flows are discussed. In addition applications to coating flows are presented.

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