MAS work seminars

Back to the MAS seminarsMAS informal work seminars This seminar is intended for the presentation of work in progress and as an opportunity to get some feedback from colleagues. Meetings are informal and intended for anyone who is interested; please contact Jens Rademacher.

Back to the MAS seminars

MAS informal work seminars

This seminar is intended for the presentation of work in progress and as an opportunity to get some feedback from colleagues. Meetings are informal and intended for anyone who is interested; please contact Jens Rademacher.


Date: 21 June 2007
Time: 10.00h
Room: M279

Speaker: Jens Rademacher, CWI MAS, Treating singular perturbations by Liapunov-Schmidt reduction.

Date: 27 June 2007
Time: 12.00h
Room: M279

Speaker: Matthew Holzer, Boston University, USA, A scaling approach to the renormalization group method and normal forms.

Date: 23 August 2007
Time: 10.00h
Room: M279

Speaker: Daan Crommelin, CWI MAS, In atmospheric science, a well-known problem is how to represent physical processes that take place on spatial scales that are too small to resolve in a numerical model (e.g., cloud formation). I will discuss a new approach to this so-called "parameterization problem", which uses conditional Markov processes to represent subgrid-scale processes.


Date: 21 November 2007
Time: 11.00h
Room: M279

Speaker: Jens Rademacher, CWI MAS, Stability analysis of circular streamers


Date: 27 November 2007
Time: 10.30h
Room: M279

Speaker: Arjen Doelman, CWI MAS, Stability analysis in singularly perturbed systems: the limitations of the NLEP method


Date: 14 February 2008 (rescheduled to this)
Time: 10h
Room: M279

Speaker: Jens Rademacher, CWI MAS, Unfolding heteroclinic networks of equilibria and periodic orbits using Liapunov-Schmidt reduction


Date: 17 April 2008
Time: 14h (!)
Room: M280

Speaker: Peter van Hijster, CWI, MAS, Stability of front motion by a renormalization group method


Date: 8 May 2008 MOVED TO 29th!
Time: 10.30h
Room: M280

Speaker: Jeroen Hazewinkel, CWI MAS, Transport by internal waves


Date: 15 May 2008
Time: 14h
Room: M279

Speaker: Jens Rademacher, CWI MAS , Unfolding heteroclinic networks of equilibria and periodic orbits


Date: 29 May 2008
Time: 11.00h
Room: tba

Speaker: Jeroen Hazewinkel, CWI MAS, Transport by internal waves


Date: 5 June 2008
Time: 11.00h
Room: M280

Speaker: Jens Rademacher, CWI MAS, Semi-weak and semi-strong interaction of pulses


Date: 22 August 2008
Time: 11.00h
Room: M280

Speaker: Julia Ehrt, WIAS Berlin, Normally hyperbolic manifolds for viscous balance laws.


Date: 17 October 2008
Time: 11.00h
Room: C0.01 (porta cabin)

Speaker: Keiichi Ueda, Research Institute for Mathematical Sciences, Kyoto University, Behavior of an amoeba in heterogeneous media.

We focus on the effect of inhomogeneous environments on tip migration behavior in the Physarum plasmodium of true slime mold. The plasmodium migrating in a narrow lane shows penetration, rebound, and splitting dynamics when it encounters the presence of a chemical repellent, quinine. In order to understand the dynamics, we propose a phenomenological model based on reaction-diffusion systems.

 


Date: 23 October 2008
Time: 11.00h
Room: M279

Speaker: Julia Ehrt, WIAS Berlin, Semi-strong interaction of pulses


Date: 24 November 2008
Time: 11.00h
Room: M279

Speaker: Arjen Doelman, CWI MAS, An explicit theory for pulses in singularly perturbed reaction-diffusion equations

In recent years, various authors have developed methods to study the existence, stability and bifurcations of pulses in a number of model problems, such as the Gray-Scott and the Gierer-Meinhardt equations. Although these methods are in principle of a general nature, they do rely heavily on the characteristics of these models. For instance, the slow spatial problem is linear in the models. This fact is crucially used in the stability analysis. Here, we present and apply a significantly extended explicit theory for pulses in the most general (singularly perturbed) setting.

Date: 27 November 2008
Time: 11.00h
Room: M279

Speaker: Kei-Ichi Ueda, Kyoto University, Pulse dynamics near singularities in a three-component reaction-diffusion system
Date: 3 December 2009
Time: 10.00h
Room: Nikhef H220 (!)

Speaker: Martina Cirilius-Bruckner, University of Karlsruhe and CWI, Pulse dynamics in a three-component reaction-diffusion system