[This is the old program from WS 2005/06. The current program and contact information can be found here.]

28 October 2005, 16:00

Thilo Gross (Institut für Physik, Universität Potsdam)
Generalized models: a new tool for the investigation of nonlinear systems

11 November 2005, 16:00

Luca Mariani (Institut für Biologie, Humboldt-Universität zu Berlin)
Stochastic gene expression in Th2 cell population: a mathematical model for IL4 response dynamics

25 November 2005, 16:00

Marcus Hauser (Institut für Experimentelle Physik, Universität Magdeburg)
Nonlinear dynamics in natural and biomimetic enzyme systems

9 December 2005, 16:00

Uwe Thiele (Max-Planck-Institut für Physik komplexer Systeme, Dresden)
Structure formation in thin liquid films: Beyond the case of a single evolution equation [Abstract] 

6 January 2006, 16:00

Mitsugu Matsushita (Department of Physics, Chuo University, Tokyo)
Colony formation in bacteria - experiments and modeling [Abstract] 

13 January 2006, 16:00

Oliver Rudzick (Fritz-Haber-Institut, Berlin)
Trapping of waves and twisted spirals in forced oscillatory media: Results for the CGLE and the catalytic CO oxidation on Pt(110) 

Abstract:
A new kind of nonlinear nonequilibrium patterns - twisted spiral waves - is predicted for periodically forced oscillatory reaction-diffusion media. We show furthermore that, in such media, spatial regions with modified local properties may act as traps where propagating waves can be stored and released in a controlled way. Underlying both phenomena is the effect of the wavelength-dependent propagation reversal of traveling phase fronts, always possible when homogeneous oscillations are modulationally stable without forcing. The analysis is performed using as a model the complex Ginzburg-Landau equation, applicable for reaction-diffusion systems in the vicinity of a supercritical Hopf bifurcation.
As an example for a realistic model describing a reaction-diffusion system we present numerical results obtained with the Krischer-Eiswirth-Ertl model for the catalytic CO oxidation on Pt(110). Using a temperature-dependent variant of the model it is demonstrated that wave propagation reversal is present for subharmonic forcing as well as for superharmonic forcing. Inhomogeneities of the surface temperature can be used to construct wave traps in 1d and 2d.

17 February 2006, 16:00

Michal Or-Guil (Institut für Theoretische Biologie, Humboldt-Universität zu Berlin)
Antigen processing by proteasomes and its influence on killer T cell responses - mathematical models