Past Seminars › Seminar Series

Applied Dynamical Systems and Inverse Problems Seminar (past)

Tue, 30/10/2012
11:00 		Dr Hugh McNamara (OCCAM) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Hysteresis operators: history, applications and an open inverse problem
The Preisach model of hysteresis has a long history, a convenient algorithmic form and "nice" mathematical properties (for a given value of nice) that make it suitable for use in differential equations and other dynamical systems. The difficulty lies in the fact that the "parameter" for the Preisach model is infinite dimensional—in full generality it is a measure on the half-plane. Applications of the Preisach model (two interesting examples are magnetostrictive materials and vadose zone hydrology) require methods to specify a measure based on experimental or observed data. Current approaches largely rely on direct measurements of experimental samples, however in some cases these might not be sufficient or direct measurements may not be practical. I will present the Preisach model in all its glory, along with some history and applications, and introduce an open inverse problem of fiendish difficulty.
Tue, 23/10/2012
11:00 		Hannah Arnold (AOPP, Oxford) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Parametrisation Schemes and Forecasting Regimes
Tue, 08/05/2012
11:00 		Shilan Mistry (OCIAM, Oxford) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Evaluating Probabilistic Forecasts
Tue, 06/03/2012
11:00 		Dr Wonjung Lee and Dr Chris Farmer (OCCAM) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Some recent developments in filtering and smoothing theory
Tue, 31/01/2012
11:00 		Dr Wonjung Lee (OCCAM) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Application of the cubature on Wiener space to turbulence filtering
In this talk we aim to filter the Majda-McLaughlin-Tabak(MMT) model, which is a one-dimensional prototypical turbulence system. Due to its inherent high dimensionality, we first try to find a low dimensional dynamical system whose statistical property is similar to the original complexity system. This dimensional reduction, called stochastic parametrization, is clearly well-known method but the value of current work lies in the derivation of an analytic closure for the parameters. We then discuss the necessity of the accurate filtering algorithm for this effective dynamics, and introduce the particle filter using the cubature on Wiener space and the recombination skill.
Tue, 17/01/2012
11:00 		Dr Andrew Dawson ((AOPP (Oxford University))) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Rossby wave dynamics of the extra-tropical response to El Nino. Part 2
Tue, 22/11/2011
11:00 		Dr Andrew Dawson (AOPP (Oxford University)) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Rossby wave dynamics of the extra-tropical response to El Nino
Tue, 01/03/2011
11:00 		Athanasios Tsanas (Mathematics (Oxford)) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Dimensionality Reduction
Tue, 15/02/2011
11:00 		Jari Fowkes (Mathematics (Oxford)) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
On Optimisation
Tue, 08/02/2011
11:00 		Hannah Arnold (AOPP (Oxford University)) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Stochastic Parameterisation Part 2
Tue, 01/02/2011
11:00 		Hannah Arnold (AOPP (Oxford University)) Applied Dynamical Systems and Inverse Problems Seminar Add to calendar DH 3rd floor SR
Stochastic Parameterisation
This will be a discussion on Stochastic Parameterisation, led by Hannah.

For any corrections/updates to these listings, please contact seminars [-at-] maths [dot] ox [dot] ac [dot] uk.

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