Forschungsgruppe "Laserdynamik"
Seminar Laserdynamik (Archiv)
zu den aktuellen Veranstaltungen
- Donnerstag, 22.03.2012, 10.00 Uhr (WIAS-406)
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Dr. O. Omel'chenko, WIAS Berlin:
Coherence-incoherence patterns in systems of non-locally coupled phase oscillators
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Veranstalter
WIAS Berlin
- Dienstag, 13.12.2011, 10.00 Uhr (WIAS-ESH)
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Dr. S. Zelik, University of Surrey, UK:
Infinite-dimensionality in the "finite-dimensional" dissipative dynamics
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- Donnerstag, 08.12.2011, 10.00 Uhr (WIAS-ESH)
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Prof. R. Ciegis, Gediminas Technical University, Vilnius:
Numerical approximation of one model of the bacterial self-organization: analysis of the dynamics
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- Donnerstag, 01.12.2011, 10.00 Uhr (WIAS-ESH)
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Dr. D. Glyzin, Yaroslavl State University:
Relaxation oscillations in a chain of coupled delay differential equations
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- Dienstag, 09.08.2011, 15.00 Uhr (WIAS-ESH)
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Th. Kolokolnikov, Dalhousie University:
Particle interaction models of biological aggregation
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Abstrakt
Animal groups often form striking aggregation patterns. Examples include from schools of fish to locust swarms, to patterns in bacterial cultures. In this talk, we discuss a very simple model of swarming based on pairwise particle interactions with short-range attraction and long-range repulsion, which can lead to very complex and intriguing patterns in two or three dimensions. Depending on the relative strengths of attraction and repulsion, a multitude of various patterns are observed, from nearly-constant density swarms to annular solutions, to complex N-fold symmetry patterns. We show that annular-type patterns may form if short-range repulsion is sufficiently weak. A Turing-type analysis of such annular states further reveals a wealth of possible instabilities which often lead to complicated and beautiful patterns. We also classify two-ring, annular and triangular patterns which arise when the ring becomes unstable. In three dimensions, we classify the stability of a sphere using spherical harmonics. Finally, we consider the inverse problem: given a target pattern, how to custom-design the interaction force to obtain said pattern as a steady state.
Veranstalter
WIAS Berlin
- Dienstag, 26.07.2011, 15.00 Uhr (WIAS-ESH)
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Prof. D. Turaev, Imperial College London:
Diffeomorphisms not conjugate to those of higher smoothness
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- Dienstag, 19.07.2011, 10.00 Uhr (WIAS-406)
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R. Arkhipov, Saint-Petersburg:
Theoretical investigations of some problems interaction of resonance laser radiation and matter - analytical and numerical simulations
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, 4. Etage, Weierstraß-Hörsaal (Raum: 406)
Veranstalter
WIAS Berlin
- Montag, 18.07.2011, 13.00 Uhr (WIAS-ESH)
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S. Morawiec, Lodz:
Polarization effects in nitride light emitting diodes
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- Donnerstag, 14.07.2011, 10.00 Uhr (WIAS-ESH)
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K. Filonenko, St-Petersburg:
One-- and two--frequency spectral purities of optical parametric oscillator
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin
- Dienstag, 05.07.2011, 10.00 Uhr (WIAS-ESH)
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D. A. Puzyrev, St-Petersburg:
Advanced numerical and computational methods in modeling of quantum few-body phenomena
mehr ... Veranstaltungsort
Weierstraß-Institut, Mohrenstr. 39, 10117 Berlin, Erdgeschoss, Erhard-Schmidt-Hörsaal
Veranstalter
WIAS Berlin