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**Applied Mathematics Seminars**- Previous Applied Seminars
- Applied Mathematics Seminars Summer 2014
- Applied Mathematics Seminars Spring 2014
- Applied Mathematics Seminars Autumn 2013
- Applied Mathematics Seminars Spring 2013
- Applied Mathematics Seminars Autumn 2012
- Applied Mathematics Seminars Summer 2012
- Applied Mathematics Seminars Spring 2012
- Applied Mathematics Seminars Autumn 2011
- Applied Mathematics Seminars Spring 2011
- Applied Mathematics Seminars Autumn 2010
- Applied Mathematics Seminars Spring 2010
- Applied Mathematics Seminars Autumn 2009
- Applied Mathematics Seminars Spring 2009
- Applied Mathematics Seminars Autumn 2008
- Applied Mathematics Seminars Spring 2008
- Applied Mathematics Seminars Autumn 2007

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- Discrete Geometry and Combinatorics Seminar
- Pure Mathematics Seminars
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### UCL Mathematics PhD Open Afternoon, Wednesday 26 November 2014

### London School of Geometry and Number Theory (LSGNT)

*EPSRC award offers new PhD opportunities in pure mathematics*

### UCL Mathematics and Statistical Science 5th in league table for UK mathematics departments

### Helen Wilson and Mark Ronan comment on the Fields Medal 2014

## Applied Mathematics Seminars

### Autumn 2014

All seminars (unless otherwise stated) will take place on **Tuesdays at
3.00pm in ****Drayton B20 Jevons LT **which is located in Drayton House (30 Gordon Street). See the **link to the map for Drayton House** for further details. There will be tea afterwards in Room 606 in the Mathematics Department (25 Gordon Street, across the street from Drayton House) - see how to find us for further details. If
you require any more information on the Applied seminars please
contact Prof Slava Kurylev e-mail: y.kurylev AT ucl.ac.uk or
tel:
020-7679-7896.

### 7 October 2014

Dr G El - University of Loughborough

###### Title: Soliton gas and soliton turbulence in integrable systems

Abstract:

A linear operator pencil P(lambda)=A-lambda B, with self-adjoint
coefficients A and B, may have a complicated spectral picture if both operators
A, B are sign-indefinite. I will discuss (up to) three examples - a matrix
pencil with a very simple structure studied jointly with E B Davies, a simple
ODE pencil (joint work in progress with M Seri), and a problem involving a
Dirac operator (joint work with D M Elton and I Polterovich) which illustrate
some interesting and not yet fully understood phenomena and pose a number of
open questions.

### 14 October 2014

Prof Mikhail Levitin - University of Reading

###### Title: Complex spectra of self-adjoint linear pencils

Abstract:

A linear operator pencil P(lambda)=A-lambda B, with self-adjoint
coefficients A and B, may have a complicated spectral picture if both operators
A, B are sign-indefinite. I will discuss (up to) three examples - a matrix
pencil with a very simple structure studied jointly with E B Davies, a simple
ODE pencil (joint work in progress with M Seri), and a problem involving a
Dirac operator (joint work with D M Elton and I Polterovich) which illustrate
some interesting and not yet fully understood phenomena and pose a number of
open questions.

### 21 October 2014

Prof Carol Alexander - University of Sussex

###### Title: Discretization-Invariant Swaps

Abstract:

Please click here for the abstract

### 28 October 2014

Prof Geoff Vallis - University of Exeter

###### Title: Some GFD Problems in Global Warming

Abstract:

I will discuss a few problems in Geophysical
Fluid Dynamics that arise when considering a planetary atmosphere that is
warming. These include the increase in height of the tropopause, the expansion
of the Hadley Cell, and a shift in the mid-latitude jets.

### 4 November 2014 - NO SEMINAR

### 11 November 2014

Dr Emilian Parau - University of East Anglia

###### Title: Axisymmetric Solitary Waves on a Ferrofluid Jet

Abstract:

Travelling axisymmetric solitary waves on the surface of a cylindrical ferrofluid jet are investigated. An azimuthal magnetic field is generated by an electric current flowing along a stationary metal rod which is mounted along the axis of the moving jet. A numerical method is used to compute fully nonlinear travelling solitary waves and comparisons with weakly nonlinear theories and experiments are presented.

### 18 November 2014

Dr Eric Keaveny - Imperial College London

###### Title: Force-coupling method for self-propelled and Bownian particles

Abstract:

The force-coupling method (FCM) is a regularized multipole technique for the large-scale simulation of particle suspensions. I will discuss two recent advances with FCM, one pertaining to the modelling of active, self-propelled particles and the other to the inclusion of Brownian motion. For self-propelled particles, I will show that flows generated by their active surface modes have a natural representation in FCM, and with minor modifications, the standard FCM approach for passive particles can also be applied to active ones. I will also discuss how to include particle Brownian motion by forcing the fluid surrounding the particles with a white-noise fluctuating stress. By requiring the resulting flow satisfy the usual constraints imposed in FCM, the correct particle velocity correlations emerge, even when higher-order terms, such as the stresslets, are included in the multipole expansion. I will show simulation results demonstrating the effectiveness of these adaptations with some simulations reaching O(10^4-10^5) independent particles.

### 25 November 2014 - COLLOQUIUM TALK

Prof Beatrice Pelloni - University of Reading

###### - please see the Departmental Colloquia webpage

### 2 December 2014 - INFORMAL SEMINAR

Prof Alexei Popov - Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Moscow

###### Title: Parametric theory of parametric resonance

Abstract:

How a child, without knowing the works of Floquet and Hill, finds an optimal way of amplifying the swings? He/she is guided by the current phase of the oscillations. On this way, one can obtain a continuum of elementary solutions and explicit formulae for an increment of the amplification. Applications to photonics are considered.

### 9 December 2014 - NO SEMINAR

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