Veranstaltungen

zum Archiv

Dienstag, 18.07.2017, 13.30 Uhr (WIAS-ESH)
Seminar Numerische Mathematik
Dr. D. Peschka, WIAS Berlin:
Variational structure of viscous flows with contact line motion
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
In this talk I will present variational approach to the free boundary problem of fluid motion over solid and liquid substrates, focussing on algorithmic approaches for the treatment of contact line motion.

Veranstalter
WIAS Berlin
Dienstag, 18.07.2017, 15.00 Uhr (WIAS-406)
Seminar Modern Methods in Applied Stochastics and Nonparametric Statistics
Dr. M. Maurelli, WIAS Berlin:
2D Stochastic Euler equations: Flow representation and vortex approximation
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)

Abstrakt
We consider two dimensional Euler equations (in vorticity form) for incompressible fluids, with a stochastic term of transport-type. Deterministic Euler equations in 2D can be associated with an ODE with non-local (mean field) way. We extend this interpretation to the stochastic case and we provide well-posedness and suitable particle approximation. This is based on joint works with Michele Coghi, Franco Flandoli and Zdzislaw Brzezniak.

Veranstalter
WIAS Berlin
Dienstag, 18.07.2017, 15.15 Uhr (WIAS-ESH)
Oberseminar Nonlinear Dynamics
J.-Y. Dai, Freie Universität Berlin:
Spiral waves in circular and spherical geometries. The Ginzburg--Landau paradigm
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
We prove the existence of spiral waves for the complex Ginzburg-Landau equation in the circular and spherical geometries. Instead of applying the shooting method from the literature, we establish a functional approach and adopt global bifurcation analysis to solve the spiral wave elliptic equation. Moreover, we prove the existence of two new patterns: frozen spirals in the circular and spherical geometries and spiral-pairs, that is, spirals with two tips, in the spherical geometry.

Veranstalter
Freie Universität Berlin
WIAS Berlin
Mittwoch, 19.07.2017, 18.15 Uhr (WIAS-ESH)
Berliner Kolloquium Wahrscheinlichkeitstheorie/Berlin Young Probabilists' Seminar
Prof. Dr. A. Bovier, Rheinische Friedrich-Wilhelms-Universität Bonn:
Adaptive dynamics, diploid models, and the escape from selection
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Abstrakt
Standard stochastic models of adaptive dynamics are based on haploid reproduction schemes. They are sometimes criticised for the difficulty to create genetic diversity. This can be traced to the fact that unless parameters are fine-tuned, times of fixation and extinctions are of the same order. We show that in diploid models, it fitter alleles are dominant, extinction times are dramatically increased. We show that, under reasonable assumptions, this can lead to the recovery of an initial unfit allele after the appearance of a second mutant allele, leading to the coexistence of two phenotypes without fin-tuning hypothesis. (joint work with Rebecca Neukirch and Loren Coquille)

Weitere Informationen
Berliner Kolloquium Wahrscheinlichkeitstheorie

Veranstalter
Humboldt-Universität zu Berlin
Technische Universität Berlin
Universität Potsdam
WIAS Berlin
Donnerstag, 20.07.2017, 16.00 Uhr (WIAS-ESH)
Forschungsseminar Mathematische Modelle der Photonik
S. Pickartz, WIAS Berlin:
Cancellation of Raman self-frequency shift for compression of optical pulses
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal

Veranstalter
WIAS Berlin