Group items tagged

2012 3 - 7 September 2012 Complex patterns in wave functions - drums, graphs, and disorder The Kavli Royal Society International Centre at Chicheley Hall Organized by Sven Gnutzmann (Nottingham)  and Uzy Smilansky (WIS Israel and Cardiff) LMS Regional Meeting and Workshop: Quantum Probabilistic Symmetries Aberystwyth University Scientific Advisory Committee David Evans (Cardiff), Martin Lindsay (Lancaster), Gilles Pisier (Paris and Texas A&M) and  Dan Voiculescu  (Berkeley) 23 July - 17th August 2012 Spectral Theory of Relativistic Operators Isaac Newton Institute for Mathematical Sciences, Cambridge Organized by B.M. Brown (Cardiff), M.J. Esteban (CEREMADE), K-M. Schmidt (Cardiff), H. Siedentop (Munich) 18 - 22 - July 2012 XXth Oporto Meeting on Geometry, Topology and Physics Noncommutative Geometry and Conformal Field Theory, Oporto University, Portugal Organized by C Herdeiro (CFP and Univ. of Aveiro), D. E. Evans (Cardiff) - Chairman, J.N. Tavares (CMUP and Univ. of Porto), J. Mourao (CAMGSD and IST Instituto Superior Tecnico, Lisbon), M. Mackaay (CAMGSD and Univ. of the Algarvel), M. Costa (CFP and Univ. of Porto), P. Pinto (CAMGSD and IST), R. Picken (CAMGSD and IST) 2 - 3 April 2012 6th MOPNet Meeting : University Of Bath

2013 17-19 December 2013 Workshop on Combinatorial Physics Organized by Dr. Roger Behrend. 16-18 December 2013 Optimal Decisions in Statistics and Data Analysis Organized by Prof. Anatoly Zhigljavsky and Dr. Jonathan Gillard 18 October 2013 Categorically Cardiff: Derived Categories and Algebraic Geometry Organized by Timothy Logvinenko 17 October 2013 COW Seminar Organized by Timothy Logvinenko 1-2 July 2013 Spectral Analysis and Differential Equations 13 - 15 May 2013 LANCS International Workshop on Discrete and Nonlinear Optimisation 16 April 2013 LSW Frontiers Distinguished Lecture Sir Vaughan Jones FRS (Vanderbilt) 15th March 2013 COW Algebraic Geometry Seminar Organized by Timothy Logvinenko 15th February 2013 Modern Trends in Markov Processes and Queueing Theory Organized by Jeff Griffiths and Nikolai Leonenko 21 January 2013 SIAM Chapter Day 7 - 10 January 2013 Dissipative Spectral Theory Organized by Marco Marletta and  Kirill Cherednichenko  

2011 20 September - 1 October 2011 Rigorous Quantum Field Theory in the LHC era Erwin Schrödinger International Institute for Mathematical Physics (ESI) Organized by C. Jäkel (Cardiff), C. Kopper (Ecole Polytechnique), G. Lechner (Vienna) 12 - 13 September 2011 5th Mopnet Meeting : University College, London 11 - 14 September 2011 Bath-Berlin Workshop "Phase boundaries and random polymers" Organisers: Nicolas Dirr (Cardiff), Peter Mörters (Bath) and Max von Renesse (TU Berlin) 27 - 28 April 2011 4th MOPNet Meeting : Manchester Institute for the Mathematical Sciences 25 - 30 April 2011 EU-NCG 4th Annual Meeting Simion Stoilow Institute of Mathematics of the Romanian Academy (IMAR) Bucharest, Romania Organized by D.E. Evans (Cardiff), R. Nest (Copenhagen), R Purice (IMAR), S Stratila (IMAR) 2-3 May 2011 WIMCS workshop on Representations of Braid and Symmetric Groups - New Approaches  Aberystwyth University  Organized by David Evans (Cardiff), Rolf Gohm (Aberystwyth) and Claus Köstler (Aberystwyth) See Also: http://users.aber.ac.uk/cck/wicms_may2011_aber/index.html  

2012 5 - 7 September 2012 Stochastic Methods and Nonlinear PDEs Conference 4 September 2012 South West PDE Day Confirmed Speakers: Issac Vikram Chenchiah (Bristol), Roger Moser (Bath), Matteo Novaga (Padova), Kewei Zhang 28 June 2012 Institute of Non-Newtonian Fluid Mechanics Annual Public Lecture Speaker: Roland Keunings (UCL, Belgium) 8 - 11 May 2012 WIMCS-Leverhulme Conference on Spectral Theory 24 April 2012 Inverse Problems In Neuroimaging Conference 18 April 2012 LSW Frontiers Distinguished Lecture Isaac Newton Institute 20th Anniversary Lecture Alain Connes (College de France, IHES and Vanderbilt). Click here for more information. 17 April 2012 LSW Frontiers Distinguished Lecture Lyn Evans (CERN). Click here for more information. 16 - 20 April 2012 INI-WIMCS Meeting on Noncommutative Geometry  

20 - 22 September 2010 3rd MOPNet Meeting : Edinburgh Conference Centre at Heriot-Watt University29 - 30 March 2010 2nd MOPnet Meeting : Department of Mechanical Materials and Manufacturing Engineering at Nottingham University 1 March - 30 April 2010 Quantum field theory on curved space-times and curved target-spaces Erwin Schrödinger International Institute for Mathematical Physics (ESI) Organized by M. Gaberdiel (ETH Zurich), S. Hollands (Cardiff), V. Schomerus (Hamburg) J. Yngvason (ESI Vienna) Included a workshop (March 22 - 26) 26 February 2010 WIMCS Mathematical Physics Colloquium Swansea University Organized by David Evans (Cardiff) Speakers: Marcos Marino (Geneva) and Richard Thomas (Imperial)

2008 16 – 20 June 2008 EU-NCG 1st Annual Meeting School of Theoretical Physics, Dublin Institute for Advanced Studies (DIAS) Scientific Advisory Committee: R. Dijkgraaf (Amsterdam), D.E. Evans (Cardiff), A. Jaffe (Harvard), R. Nest (Copenhagen), W. Nahm (DIAS Dublin), D. O'Connor, Dublin.     2007 8 January - 29 June 2007 Analysis on Graphs and its Applications Isaac Newton Institute for Mathematical Sciences, Cambridge Organised by :  B..M Brown (Cardiff),  P. Exner (Czech Academy of Sciences),  P. Kuchment (Texas), T Sunada (Meiji)

2009 28 September - 2 October 2009 EU-NCG 2nd Annual Meeting and Mid-Term Review Mathematics Institute, Copenhagen University Organized by E. Christensen (Copenhagen), S. Eilers (Copenhagen), D. E. Evans (Cardiff), R Nest (Copenhagen) 14 - 15 September 2009 1st MOPnet Meeting : Department of Mathematics at Reading University  

2011 24 – 19 July 2011 ORAHS 2011 OR Informing National Health Policy 1 July 2011 WIMCS Mathematical Physics Colloquium Speakers: Susanne Danz (Oxford), Terry Gannon (Edmonton), Grigory Garkusha (Swansea) 9 - 10 May 2011 EU-NCG WIMCS workshop on Higher Gauge Theory, TQFT's and Categorification. Speakers include: Aristide Baratin (Orsay, Paris), Benjamin Bahr (Cambridge), Alexander Kahle (Göttingen), Jeffrey Morton (Lisbon), Urs Schreiber (Utrecht), Jamie Vicary (Oxford), Konrad Waldorf (Regensburg), Christoph Wockel (Hamburg) 20 - 21 April 2011 EU-NCG WIMCS workshop on Quantum Field Theory Speakers: Henning Bostelmann (York), Romeo Brunetti (Trento), Detlev Buchholz (Göttingen), Christian Jäkel (Cardiff), Gandalf Lechner (Vienna), Florian Robl (Cardiff) 4-8 April 2011 European Study Group with Industry 80 17 January 2011 LSW Frontiers Distinguished LectureSpeaker: Sir Michael Atiyah (Edinburgh)  

2010 20 – 22 December WIMCS Annual Meeting 18 - 20 December New Trends in Spectral Theory and Applications 28 June LSW Frontiers Distinguished Lecture Speaker: Dan-Virgil Voiculescu (Berkeley) 28 June - 2 July EU-NCG 3rd Annual Meeting Speakers include: Iakovos Androulidakis (Göttingen), Dorothea Bahns (Göttingen), Moulay-Tahar Benameur (Metz), Sebastiano Carpi (Rome), Kenny De Commer (Rome), Bergfinnur Durhuus (Copenhagen), Robin Hillier (Rome), Stefan Hollands (Cardiff), Tommaso Isola (Rome), Yasuyuki Kawahigashi (Tokyo), Amin Malik (Oslo), Jouko Mickelsson (Helsinki), Denjoe O'Connor (DIAS), Thomas Schucker (Provence), Wojciech Szymanski (Odense), Otgonbayar Uuye (Copenhagen), André Verbeure (K.U. Leuven), Dan Voiculescu (Berkeley), Mihaly Weiner (Rome), Jakob Yngvason (ESI, Vienna), Laszlo Zsido (Rome). 21-25 June

LMS Regional Meeting and Workshop on Operator Algebras and Physics Principal Speaker: Constantin Teleman (Berkeley) who is giving a series of talks on Two Dimensional Topological Quantum Field Theories and Gauge Theories. The first talk by Constantin Teleman will be in the LMS regional meeting on the first afternoon, Monday 21 June which is embedded in the five-day workshop. The other speaker in the regional meeting on the Monday afternoon will be Werner Nahm (Dublin). Speakers include Terry Gannon (Alberta), Johannes Kellendonk (Lyon), Michael Müger (Nijmegen), Andreas Recknagel (King's), Karl-Henning Rehren (Göttingen), Richard Szabo (Heriot-Watt), Jean-Louis Tu (Metz), Gerard Watts (King's) 17-21 May Nigel Higson Lectures The Baum-Connes Conjecture and Group Representations. This includes a Spitalfields Day on 17 May with speakers Terry Gannon (Alberta) and Nigel Higson. Speaker: Nigel Higson (Penn State) 5 May Multifractionality and Multifractality and Their Applications TThe Workshop was sponsored by a grant form European Commu

nities PIRSES-GA-2008-230804 (Marie Curie) "Multi-parameter Multi-fractional Brownian Motion" for collaboration between Cardiff University and CNRS, Nancy (France), Kyiv National Taras Shevchenko University (Ukraine) and Bar Ilan University (Israel). Speakers: Prof. Y. Mishura (Kyiv University), Prof. N. Leonenko (Cardiff University), Dr.L.Sakhno (Kyiv University), Dr.G.Shevchenko (Kyiv University), Mr A.Ralchenko (Kyiv University).   15 April COW Seminar Speakers: Katrin Wendland (Augsburg) and Sven Meinhardt (Oxford) 15 February - 5 March Period on Planar Algebras and Physics Speakers: JulienBichon (Clermont), Stephen Bigelow (UCSB), Richard Burstein (Vanderbilt), Ben Davison (Oxford), Jürgen Fuchs (Karlstad), Shamindra Ghosh (KU Leuven), Pinhas Grossman (Cardiff), Ved Gupta (Leuven), Amihay Hanany (Imperial), Yang-Hui He (Oxford), PawelKasprzak (Copenhagen), Alastair King (Bath), Mathew Pugh (Cardiff), Alex Quintero-Velez (Glasgow), Sven Raum (Leuven), Peter West (King's College, London) 13-14 January 2010 LANCS Workshop on Heuristic Understanding  

2009 3 – 4 September Lattice Boltzmann Method Workshop 29 June– 1 July Spectral Theory, Quantum Chaos and Random Matrices Organized by: Michael Levitin (Cardiff) and Uzy Smilansky (WIS Israel and Cardiff). 15 – 17 April AERC 2009 5th Annual European Rheology Conference 30-31 March Inaugural Meeting of MOPNET 19 March 125th Anniversary Cardiff Distinguished Lecture Speaker: Percy Deift (Courant Institute) 11 February Analysis Cluster Workshop 22 January Operator Algebras Seminar Speakers: Simon Wassermann (Glasgow), Wilhelm Winter (Nottingham), Rolf Gohm (Aberystwyth). 13 and 14 January WIMCS Mathematical Physics Lectures Speaker: Professor Tim Porter (Bangor, Wales). Title: Categorification and bundles

2008 26 – 27 August Non-classical, boundary and localisation phenomena in mathematical homogenisation, sponsored by LMS and WIMCS 12 – 18 July Workshop on Computation and Analytic Problems in Spectral Theory Gregynog 30 April Workshop on Mathematical Analysis and Modern Applications, Spaces and Operators on Bad Domains in Rn 30 January Workshop on Mathematical Analysis and Modern Applications   2007 25 – 26 September Perturbed periodic PDEs, problems with singular boundaries, and their numerical aspects, sponsored by LMS.

Reliable adaptive algorithms are based on a posteriori error estimates, i.e. estimates of the error in terms of values obtained in the computation process: computed solution and current mesh. Such a posteriori error estimates for parabolic partial differential equations will be the subject of this talk. For classical and singularly perturbed semilinear parabolic equations, we give computable a posteriori error estimates in the maximum norm, which, in the singularly perturbed regime, hold uniformly in the small perturbation parameter. The parabolic equations are discretized in time using the backward Euler, Crank-Nicolson and discontinuous Galerkin methods. Both semidiscrete (no spatial discretization) and fully discrete cases will be considered. The analysis invokes certain bounds for the Green's function of the parabolic operator. When dealing with the full discretizations, we also employ the elliptic reconstruction technique. Although parts of our analysis are quite technical, it will be demonstrated (using a first-order ODE example as a trivial case of a parabolic PDE) that some main ideas are quite elementary. 18 November 2014 Speaker: Robert Style (University of Oxford). Title: The mechanics of soft solids - breaking classical laws. Abstract: Soft solids make up the bulk of biological material, and are increasingly being used for new technology like wearable electronics, and soft robotics. However, despite their importance, experiments show that many classical laws fail to describe them. For example, I will show how classical theories of wetting, composite mechanics and contact mechanics significantly break down at a critical `elastocapillary' lengthscale -- because of solid surface tension. Furthermore, I will show how these phenomena highlight the existence of a swathe of new, small-scale behaviour in soft materials. Co-Host: Dr. Maurice Blount.

25 November 2014 Speaker: Xuesong Wu (Imperial College London). Title: Nonlinear development of disturbances in transitional and turbulent free shear flows. Abstract: Free shear flows, such as mixing layers, jets and wakes, are inviscidly unstable due to their inflectional velocity profiles. Instability modes, which are usually excited by external perturbations, amplify on the shear floow, leading to vortex roll-up and randomization in the nonlinear stage. Interestingly, in turbulent state free shear flows exhibit a high degree of order, characterised by the prevalent presence of so-called coherent structures, the most striking of which are Brown-Roshko rollers . Both instability waves and coherent structures are known to be dynamically significant for entrainment and mixing, noise generation as well as for turbulence modelling. In this talk, I will present a nonlinear theory to describe first the development of instability modes on laminar free shear layers. The theory predicts vortex roll-up and randomisation through a generalized side-band instability mechanism. The theory will then be modified to describe formation and evolution of Brown-Roshko rollers on turbulent mixing layers. Co-Host: Dr. Chris Davies

2 December 2014 Speaker: Matthias Heil (University of Manchester). Title: Wrinkly fingers: fluid-structure interaction in elastic-walled Hele-Shaw cells. Abstract: Viscous fingering in Hele-Shaw cells is a classical and widely studied fluid-mechanical instability: When air is injected into the narrow, liquid-filled gap between parallel rigid plates, the axisymmetrically expanding air-liquid interface tends to be unstable to non-axisymmetric perturbations when the capillary number -- the ratio of (destabilising) viscous to (stabilising) capillary forces acting at the air-liquid interface -- becomes sufficiently large. The introduction of wall elasticity (via the replacement of one of the bounding plates by an elastic membrane) can weaken or even suppress the fingering instability, but it also makes the system susceptible to additional solid-mechanical instabilities.

We show that in elastic-walled Hele-Shaw cells that are bounded by sufficiently thin elastic sheets, the (fluid-based) viscous fingering instability can arise concurrently with a (solid-based) wrinkling instability. We study the interaction between these distinct instabilities, using a theoretical model that couples the depth-averaged lubrication equations for the fluid flow to the Föppl--von Kármán equations, which describe the deformation of the thin elastic sheet. We employ a linear stability analysis to determine the growth rate of non-axisymmetric perturbations to the axisymmetrically expanding bubble, and perform direct numerical simulations to study the nonlinear interactions between the instabilities. We show that the system's behaviour may be characterised by a non-dimensional parameter that indicates the strength of the fluid-structure interaction. For small [large] values of this parameter the system's behaviour is dominated by viscous fingering [wrinkling], with strong interactions between the two instabilities arising in an intermediate regime. [Joint work with Draga Pihler-Puzovic and Anne Juel]. Co-Host: Dr. Chris Davies

3 February 2015 Speaker: Helen Wilson (University College London). Title: Instabilities in viscoelastic fluids. Abstract: Non-Newtonian and viscoelastic fluids show many fascinating properties. One of the most surprising (and irritating, for those who process them in a manufacturing context) is their susceptibility to instabilities at flow rates where an "equivalent" Newtonian fluid would flow stably. I will use linear stability theory, and some asymptotic expansions, to discuss two distinct instability mechanisms which are unique to viscoelastic fluids. Co-Host: Professor Tim Phillips. 10 February 2015 Speaker: Dmitri Tseluiko (University of Loughborough). Title: Wave dynamics on a liquid film sheared by a turbulent gas

Abstract: The dynamics of a thin laminar liquid film flowing under gravity down the lower wall of an inclined channel when turbulent gas flows above the film will be discussed. The solution of the full system of equations describing the gas-liquid flow faces serious technical difficulties. However, a number of assumptions allow isolating the gas problem and solving it independently by treating the interface as a solid wall. This permits finding the perturbations to normal and tangential stresses at the interface imposed by the turbulent gas in closed form. Then the liquid film flow under the influence of these perturbations can be analysed by deriving and analysing a hierarchy of model equations describing the dynamics of the interface, i.e. boundary-layer equations, a long-wave model and a weakly nonlinear model, which turns out to be the Kuramoto-Sivashinsky equation with an additional term due to the presence of the turbulent gas. Also, by combining the long-wave approximation with a weighted-residual technique, an integral-boundary-layer approximation that is valid for moderately large values of the Reynolds number can be obtained. This model is then used for a systematic investigation of the flooding phenomenon observed in various experiments: as the gas flow rate is increased, the initially downward-falling film starts to travel upwards while just before the wave reversal the amplitude of the waves grows rapidly. Co-Host: Dr Nikos Savva.

17 February 2015 Speaker: David Needham (University of Birmingham). Title: The evolution to localized and front solutions in a non-Lipschitz reaction-diffusion Cauchy problem with trivial initial data. Abstract: This talk addresses the Cauchy Problem for a Non-Lipschitz Semi-Linear parabolic PDE with trivial initial data. The question of uniqueness is considered, in particular in relation to the existence of classes of spatially inhomogeneous solutions, and their relation to maximal and minimal solutions. Co-Host: Professor Tim Phillips. 17 March 2015 Speaker: Paul Milewski (University of Bath). Title: Modelling and computation of pilot wave-bouncing droplet dynamics in a Faraday problem. Abstract: Recent experiments by two groups, Yves Couder (Paris) and John Bush (MIT) have shown experimentally that droplets will bounce on the surface of a vertically vibrated bath (instead of coalescing with it), generating a damped Faraday wavefield at every bounce. As the forcing is increased, a pitchfork symmetry breaking bifurcation leads to a "walking" state whereby the bouncing droplet is guided by the self-generated wavefield: the droplet s pilot wave. Once this state is achieved a large array of interesting dynamics ensues with surprising analogies to quantum mechanical behaviour. The system appears to show that probabilistic quantum behaviour can arise from a physical deterministic system. We present a coupled particle-fluid model that can can be used simulate the fascinating dynamics of this problem. This is joint work with John Bush, Andre Nachbin (IMPA) and Carlos Galeano-Rios (IMPA). Co-Host: Dr Nikos Savva.

12 May 2015 Speaker: Pierre Colinet (TIPs laboratory, Université Libre de Bruxelles) Title: Evaporation of droplets with moving contact lines Abstract: Despite many years of intensive research, the modeling of contact lines moving by spreading and/or evaporation still remains a subject of debate nowadays, even for the simplest case of a pure liquid on a smooth and homogeneous horizontal substrate. In addition to the inherent complexity of the topic (singularities, micro-macro matching, intricate coupling of many physical effects, ), this also stems from the relatively limited number of studies directly comparing theoretical and experimental results, with as few fitting parameters as possible. In this presentation, I will address various related questions, focusing on the physics invoked to regularize singularities at the microscale, and discussing the impact this has at the macroscale. Two opposite minimalist theories will be detailed: i) a classical paradigm, based on the disjoining pressure in combination with the spreading coefficient; ii) a new approach, invoking evaporation/condensation in combination with the Kelvin effect (dependence of saturation conditions upon interfacial curvature). Most notably, the latter effect enables resolving both viscous and thermal singularities altogether, without needing any other regularizing effects such as disjoining pressure, precursor films or slip length. Experimental results are also presented about evaporation-induced contact angles, to partly validate the first approach, although it is argued that reality might often lie in between these two extreme cases. Co-Host: Dr Nikos Savva