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WIAS Conferences, Colloquiums, and Workshops


Berlin, March 22-23

Organized by: WIAS (FG 1, 2) and Fraunhofer-Institut für Nachrichtentechnik Heinrich-Hertz-Institut (HHI), Berlin

The International Mini-symposium on Mode-locked Semiconductor Lasers has been organized by U. Bandelow (FG 1), R. Kaiser and B. Hüttl (HHI). It is in some sense a continuation of the workshops on laser dynamics held three times at WIAS up to now, but with a special focus on mode-locked lasers. The latter topic is of major interest in the project Terabit Optics Berlin, especially for the project partners from HHI. A very similar kind of devices is a research topic at the Technical University of Denmark (DTU), Kgs. Lyngby, where four workshop guests came from. The modeling and simulation of such devices challenges many groups in the world--there were respective contributions from WIAS, DTU, and the University of the Balearic Islands, Mallorca/Spain.

The aim of this mini-symposium was to discuss problems in modeling such semiconductor lasers as well as in understanding measured and calculated effects, therefore discussions in a productive atmosphere took more time than the talks themselves. Talks on modeling and simulation have been given by U. Bandelow, A. Vladimirov (WIAS), and J. Mulet (Mallorca) on the first day at WIAS. On the second day at HHI, K. Yvind and D. Larsson (DTU) talked about design and performance of specific mode-locked lasers, followed by talks of C. Kindel and M. Kroh (HHI) on their devices and measurements. The number of participants was limited to 20 persons which were present.


Berlin, March 23

Organized by: WIAS (FG 3)

A festive colloquium on the occasion of the 65th birthday of Prof. Dr. Friedrich Grund has been organized on March 23, 2004, by the research group ``Numerical Mathematics and Scientific Computing''. The talks given focused on the simulation of large electric networks and chemical process simulation, the main areas Prof. Grund contributed to. Review lectures outlined the analysis and implementation of numerical methods for the solution of high-dimensional systems of linear, nonlinear, and differential-algebraic equations on workstations and parallel computers. A further topic of the colloquium has been the simulation of microwave circuits.


Berlin, April 6

Organized by: WIAS (FG 2)

Sponsored by: Alexander von Humboldt Foundation, WIAS

The mini-workshop ``Homoclinic Dynamics'' was devoted to the richness of global behavior in dynamical systems possessing degenerate homoclinic orbits. Such orbits are characterized by a non-transversal intersecting of stable and unstable manifolds. Homoclinic orbits exhibiting homoclinic tangencies form a special class of degenerate homoclinic orbits where bifurcations lead to unpredictable behavior. In the three talks given: ``Global bifurcations connected with the disappearing of a periodic orbit'' (L.P. Shilnikov), ``Homoclinic tangencies in a periodically figure eight of a saddle'' (S.V. Gonchenko), and ``On the richness of Hamiltonian dynamics'' (D. Turaev), the variety of bifurcation scenarios has been described which is connected with the arising of global bifurcations of degenerate homoclinic orbits. All lectures have been delivered by outstanding representatives of the famous Nizhny Novgorod school headed by the Humboldt-Price laureate Prof. L.P. Shilnikov. 12 participants attended the mini-workshop.


Berlin, April 27

Organized by: WIAS (FG 2)

This colloquium was organized in order to honor the outstanding achievements of
[4]PD Dr. Klaus Schneider in his scientific vita, who has been one of the organizers of the Senior Seminar ``Nonlinear Dynamics'' for more than one decade.

The four invited speakers were selected among former PhD students, coworkers, and cooperation partners. In their talks, they presented a broad range of mathematical fields, related to the work of Klaus Schneider, including singular perturbed systems, invariant manifolds, delayed loss of stability, and applications in optoelectronics. 39 participants attended the colloquium.


Berlin, July 14-16

Organized by: WIAS (FG 1)

Sponsored by: WIAS, DFG

The workshop brought together applied mathematicians and scientists from semiconductor physics and gave them the opportunity to exchange experience in the field of modeling and simulation of micro-, nano-, and optoelectronic semiconductor devices. Based on financial support of the DFG it was possible to invite experts from Europe and the USA which made the workshop an event of high scientific significance. Sixty-one participants attended the workshop, a lot of high-quality lectures (twenty invited lectures and seven contributed talks) were given. The main topics were

Some of the contributions will be published in the Journal of Applied Mathematics and Mechanics (ZAMM), issue November 2005. Further details concerning the workhop can be found at AMaSiS'04 http://www.wias-berlin.de/workshops/amasis04.


Berlin, September 27-28

Organized by: WIAS (FG 4)

Sponsored by: DFG Research Center MATHEON, WIAS

The degree of automation is increasing in many branches of industry. Moreover, there is a strong demand to reduce the cycle time in production lines. Hence, more and more robots have to work simultaneously on one component part. This poses a number of new questions in process optimization.

The aim of this workshop was to discuss these problems with an emphasis on applications in the automotive industry as well as on typical SME applications.

The main topics were the coupling of process modeling, e.g., glueing or laser treatments, and robot path planning, the issue of cooperative robots as well as the problem of uncertainties in the process data. The mini-workshop has been attended by ten participants, seven talks were given, among them three by industry representatives.


Berlin, November 15-16

Organized by: WIAS (FG 2), Humboldt-Universitšt zu Berlin

Sponsored by: DFG Research Center MATHEON, WIAS

Synchronization and high-dimensional chaos plays an important role in several fields of application, such as biology, neuroscience, optoelectronics, and communication technology. The 15 lectures given in this workshop were related to the mathematical issues connected with this field as well as to concrete problems from various applied sciences. The workshop was important for WIAS to establish and to intensify the contact to many international experts in this field. With 53 participants from 10 countries, the workshop got an unexpected high resonance.

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