University of Paderborn

About: University of Paderborn is a education organization based out in Paderborn, Nordrhein-Westfalen, Germany. It is known for research contribution in the topics: Control reconfiguration & Software. The organization has 6684 authors who have published 16929 publications receiving 323154 citations.

Two-photon Rabi oscillations in a single In x Ga 1 − x As ∕ Ga As quantum dot

Abstract: We report on Rabi oscillations of the biexciton in a single ${\mathrm{In}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}∕\mathrm{Ga}\mathrm{As}$ quantum dot, induced via a coherent two-photon process. In contrast to single-exciton Rabi oscillations the measured population oscillation is not purely sinusoidal in excitation pulse area. The experimental results are well reproduced by a theoretical calculation that relies only on the pulse shape and biexciton binding energy. Dephasing times of the biexciton are similar to those of the single exciton under the applied measurement conditions reaching up to $220\phantom{\rule{0.3em}{0ex}}\mathrm{ps}$.

Covering Pareto Sets by Multilevel Subdivision Techniques

Abstract: In this work, we present a new set-oriented numerical method for the numerical solution of multiobjective optimization problems. These methods are global in nature and allow to approximate the entire set of (global) Pareto points. After proving convergence of an associated abstract subdivision procedure, we use this result as a basis for the development of three different algorithms. We consider also appropriate combinations of them in order to improve the total performance. Finally, we illustrate the efficiency of these techniques via academic examples plus a real technical application, namely, the optimization of an active suspension system for cars.

Broadband Hybrid Holographic Multiplexing with Geometric Metasurfaces

Abstract: An effective way for broadband holographic multiplexing based on geometric metasurfaces is demonstrated by the integration of several recording channels into a single device. Each image can be individually addressed with a unique set of parameters, such as circular polarization, position, and angle. Such a technique paves the way for a wide range of applications related to optical patterning, encryption, and information processing.

Did the Hartz Reforms Speed-Up the Matching Process? A Macro-Evaluation Using Empirical Matching Functions

Abstract: Starting in January 2003, Germany implemented the first two so-calledHartz reforms, followed by the third and fourth packages of Hartzreforms in January 2004 and January 2005, respectively. The aim of thesereforms was to accelerate labor market flows and reduce unemploymentduration. Without attempting to evaluate the specific components ofthese Hartz reforms, this paper provides a first attempt to evaluate theoverall effectiveness of the first two reform waves, Hartz I/II and III,in speeding up the matching process between unemployed and vacant jobs.The analysis is conceptually rooted in the flow-based view underlyingthe reforms, estimating the structural features of the matching process.The results indicate that the reforms indeed had an impact in making thelabor market more dynamic and accelerating the matching process.