Apr 14, 2011 
Stefan Liebscher (Freie Universität Berlin) 
Fishing for ideas on Bianchi Models 
Apr 28, 2011 
SFB 910,
Opening Colloquium 
May 5, 2011 
Johannes Buchner (Freie Universität Berlin) 
Towards a convergence result for Bianchi cosmologies of class B 
The BKL conjecture suggests that the approach to the initial singularity
("big bang") is vacuum dominated, local and oscillatory. After some
results have been achieved in a spatially homogeneous setting of Bianchi
class A (Mixmastermodels), the natural next step is to consider Bianchi
models of class B.
In my talk, I will deal with the Bianchi VI_{1/9}model  the most
important one in class B, as it is the only Bianchi model appearing in the
simplest osciallatory PDE cosmological models.
I will show that the combined local linear passage near the 3cycle of the
Kasnercircle yields a convergence towards the conjectured
Bianchiattractor. I will then discuss what steps are necessary to turn
this into a rigorous convergence theorem, including a detailed study of
the global passage between the local passages near the Kasner circle.

May 12, 2011 
Sergey Tikhomirov (Freie Universität Berlin) 
Control by hysteresis in reactiondiffusion systems 
Hysteresis plays a crucial role in control of artificial systems and
those created by nature. In the talk, we discuss how it may lead to
periodic regimes and pattern
formation in various reactiondiffusion equations.

May 19, 2011 
Abderrahim Azouani (Freie Universität Berlin) 
Feedback control of nonlinear dissipative systems. Reactiondiffusion paradigm 
The aim of this talk is to design a feedback control that stabilizes an unstable solution of a reactiondiffusion equation, as an example of dissipative evolution equations on the finitedimensional space, by introducing an approximate interpolant of order h.
First, our result is demonstrated for the case of local averages, which is the most straightforward approach. Later, a more general abstract result will be presented that unifies our approach, utilizing all types of approximate interpolant observables and controllers. It will be shown that this abstract approach applies to the Fourier modes and nodal value as particular examples.
If we have time, I will present briefly a different feedback control based on nodal value observables and feedback controllers. The observables are the values of the solutions u(x_{k}) while the feedback controllers are at some points x_{k}.
Joint work with E.S. Titi (University of California, Weizmann Institute of Science).

May 26, 2011 
Pavel Gurevich (Freie Universität Berlin) 
Reactiondiffusion equations with spatially distributed hysteresis 
We consider reactiondiffusion equations involving a hysteretic discontinuity which is defined at each spatial point. We call this discontinuity spatially distributed hysteresis. In the talk, we discuss how it naturally appears and which basic properties it possesses. We give a sufficient condition under which the problem is well posed and formulate open questions for further research.

Tuesday May 31, 2011 
Juliette Hell (Freie Universität Berlin) 
Dynamics at Infinity 
June 9, 2011 
Isabelle Schneider (Free University Berlin) 
Delay stabilization of periodic orbits in coupled oscillator systems 
Anna Karnauhova (Free University Berlin) 
On manifolds admitting Anosov diffeomorphisms 
Christopher Brandt (Free University Berlin) 
Problems in the proof of the existence of a cascade of period doubling bifurcations 
June 16, 2011 
Sergey Skopinov (SaintPetersburg State University) 
Microwave heating 
Bernold Fiedler (Free University Berlin) 
Flageolet on the vibrating string: theory and experiments 
Flageolet is a very common playing technique on string instruments: the finger touches the
string slightly, at integer partitions, to produce a peculiar whistlinglike sound.
The standard string equation, alias the linear wave equation on the interval, does not
accommodate such an effect. I discuss several generalizations, based on
qualitative and quantitative experiments on my violin during the talk.
Thanks are due to Stefan Liebscher, for helpful hints on friction, and to Wolfgang Boettcher, for helpful demonstrations on his cello.

June 23, 2011 
Sergey Skopinov (SaintPetersburg State University) 
Boundedness and unboundedness of classical solutions in onedimensional heating problems 
June 30, 2011 
Waldyr Muniz Oliva (Instituto Superior Tecnico, Lisbon, Portugal) 
The story of the LotkaVolterra systems 
1. Basic notions on conservative, dissipative and stably dissipative
LV systems.
2. Associated graphs and the Volterra's characterization of conservative
systems. Symplectic and Poisson structures, Volterra's direct hamiltonian
formulation with the double of variables and the reduction.
3. Stably dissipative LV systems and the hamiltonian dynamics of the
attractor. The reduction of that dynamics to another LV system with
less dimensions.
4. Recent results.

Friday July 1, 2011 
Discussion 
Recent results on LotkaVolterra systems 
July 7, 2011 
BCSCCS conference: Engineering of Chemical Complexity 
July 14, 2011 
Anna Karnauhova  On Manifolds Admitting Anosov Diffeomorphisms 
Vu Xuan Tuyen  The global attractor of the sunflower equation 
Konstantin Bubulz  Possibilities of delay stabilization in coupled oscillator systems 
Christopher Brandt  State of my bachelor thesis on homoclinic bifurcations 
Isabelle Schneider  Delay stabilization of periodic orbits in coupled oscillator systems 
Matthias Bosewitz  Delay stabilization of periodic orbits in systems with two coupled oscillators 