@article{6526, abstract = {{We introduce photon-statistics excitation spectroscopy and exemplarily apply it to a quantum-dot micropillar laser. Both the intensity and the photon number statistics of the emission from the micropillar show a strong dependence on the photon statistics of the light used for excitation of the sample. The results under coherent and pseudothermal excitation reveal that a description of the laser properties in terms of mean input photon numbers is not sufficient. It is demonstrated that the micropillar acts as a superthermal light source when operated close to its threshold. Possible applications for important spectroscopic techniques are discussed.}}, author = {{Kazimierczuk, T. and Schmutzler, J. and Aßmann, M. and Schneider, C. and Kamp, M. and Höfling, S. and Bayer, M.}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{2}}, publisher = {{American Physical Society (APS)}}, title = {{{Photon-Statistics Excitation Spectroscopy of a Quantum-Dot Micropillar Laser}}}, doi = {{10.1103/physrevlett.115.027401}}, volume = {{115}}, year = {{2015}}, } @inproceedings{6529, author = {{Yakovlev, D. R. and Warkentin, W. and Brunne, D. and Mund, J. and Pavlov, V. V. and Rodina, A. V. and Pisarev, R. V. and Bayer, M.}}, booktitle = {{Nonlinear Optics and Applications IX}}, editor = {{Bertolotti, Mario and Haus, Joseph W. and Zheltikov, Alexei M.}}, location = {{Prague, Czech Rep}}, publisher = {{SPIE}}, title = {{{Novel mechanisms of optical harmonic generation on excitons in semiconductors}}}, doi = {{10.1117/12.2185309}}, year = {{2015}}, } @article{1696, author = {{Bader, Christina A. and Zeuner, Franziska and Bader, Manuel H. W. and Zentgraf, Thomas and Meier, Cedrik}}, issn = {{0021-8979}}, journal = {{Journal of Applied Physics}}, number = {{21}}, publisher = {{AIP Publishing}}, title = {{{Nonlinear optical sub-bandgap excitation of ZnO-based photonic resonators}}}, doi = {{10.1063/1.4936768}}, volume = {{118}}, year = {{2015}}, } @article{1698, author = {{Huang, Lingling and Mühlenbernd, Holger and Li, Xiaowei and Song, Xu and Bai, Benfeng and Wang, Yongtian and Zentgraf, Thomas}}, issn = {{0935-9648}}, journal = {{Advanced Materials}}, number = {{41}}, pages = {{6444--6449}}, publisher = {{Wiley-Blackwell}}, title = {{{Broadband Hybrid Holographic Multiplexing with Geometric Metasurfaces}}}, doi = {{10.1002/adma.201502541}}, volume = {{27}}, year = {{2015}}, } @article{1700, author = {{Zheng, Guoxing and Mühlenbernd, Holger and Kenney, Mitchell and Li, Guixin and Zentgraf, Thomas and Zhang, Shuang}}, issn = {{1748-3387}}, journal = {{Nature Nanotechnology}}, number = {{4}}, pages = {{308--312}}, publisher = {{Springer Nature}}, title = {{{Metasurface holograms reaching 80% efficiency}}}, doi = {{10.1038/nnano.2015.2}}, volume = {{10}}, year = {{2015}}, } @phdthesis{10624, abstract = {{The use of heterogeneous computing resources, such as graphics processing units or other specialized co-processors, has become widespread in recent years because of their performance and energy efficiency advantages. Operating system approaches that are limited to optimizing CPU usage are no longer sufficient for the efficient utilization of systems that comprise diverse resource types. Enabling task preemption on these architectures and migration of tasks between different resource types at run-time is not only key to improving the performance and energy consumption but also to enabling automatic scheduling methods for heterogeneous compute nodes. This thesis proposes novel techniques for run-time management of heterogeneous resources and enabling tasks to migrate between diverse hardware. It provides fundamental work towards future operating systems by discussing implications, limitations, and chances of the heterogeneity and introducing solutions for energy- and performance-efficient run-time systems. Scheduling methods to utilize heterogeneous systems by the use of a centralized scheduler are presented that show benefits over existing approaches in varying case studies.}}, author = {{Beisel, Tobias}}, isbn = {{978-3-8325-4155-2}}, pages = {{183}}, publisher = {{Logos Verlag Berlin GmbH}}, title = {{{Management and Scheduling of Accelerators for Heterogeneous High-Performance Computing}}}, year = {{2015}}, } @article{12934, author = {{Röwenstrunk, Daniel and Prätzlich, Thomas and Betzwieser, Thomas and Müller, Meinard and Szwillus, Gerd and Veit, Joachim}}, issn = {{1618-2162}}, journal = {{Datenbank-Spektrum}}, pages = {{65--72}}, title = {{{Das Gesamtkunstwerk Oper aus Datensicht}}}, doi = {{10.1007/s13222-015-0179-0}}, year = {{2015}}, } @article{1461, author = {{Mühlenbernd, Holger and Georgi, Philip and Pholchai, Nitipat and Huang, Lingling and Li, Guixin and Zhang, Shuang and Zentgraf, Thomas}}, issn = {{2330-4022}}, journal = {{ACS Photonics}}, number = {{1}}, pages = {{124--129}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Amplitude- and Phase-Controlled Surface Plasmon Polariton Excitation with Metasurfaces}}}, doi = {{10.1021/acsphotonics.5b00536}}, volume = {{3}}, year = {{2015}}, } @article{15964, author = {{Leuders, Stefan and Vollmer, Malte and Brenne, Florian and Tröster, Thomas and Niendorf, Thomas}}, issn = {{1073-5623}}, journal = {{Metallurgical and Materials Transactions A}}, pages = {{3816--3823}}, title = {{{Fatigue Strength Prediction for Titanium Alloy TiAl6V4 Manufactured by Selective Laser Melting}}}, doi = {{10.1007/s11661-015-2864-x}}, year = {{2015}}, } @inproceedings{16132, author = {{Weiß Borkowski, Nathalie and Marten, Thorsten and Block, Holger and Tröster, Thomas}}, location = {{Toronto, Canada}}, title = {{{Multi-axial Material Testing at High Strain Rates in High Speed Cupping Tests}}}, year = {{2015}}, } @inproceedings{16135, author = {{Frantz, M. and Lauter, C. and Wang, Z. and Tröster, Thomas}}, location = {{Bad Neuenahr}}, pages = {{139--144}}, publisher = {{Verlag Stahleisen GmbH}}, title = {{{Bestimmung und Optimierung von Eigenspannungen in hybriden Werkstoffsystemen aus Metall und Faserverbundkunststoff (FVK)}}}, year = {{2015}}, } @inproceedings{16136, author = {{Reuter, C. and Tröster, Thomas and Lauter, C.}}, location = {{Tagung Werkstoffprüfung 2015, Bad Neuenahr}}, pages = {{127--132}}, publisher = {{Verlag Stahleisen GmbH}}, title = {{{Kennwertermittlung an Faserverbundkunststoffen für Crashsimulationen mit dem FE-Solver LS-Dyna}}}, year = {{2015}}, } @inproceedings{16258, author = {{Reschetnik, W. and Leuders, S. and Riemer, A. and Tröster, Thomas and Richard, H. A. and Niendorf, T.}}, location = {{Orlando, Florida, USA}}, title = {{{Fatigue life prediction for metals processed by Selective Laser Melting using finite element analyses}}}, year = {{2015}}, } @inproceedings{16259, author = {{Wang, Z. and Lauter, C. and Sanitther, B. and Frantz, M. and Tröster, Thomas}}, location = {{Lisbon, Portugal}}, title = {{{Intrinsic Manufacturing of Metal-FRP-Hybrid Structural Automotive Components by Resin Transfer Moulding}}}, year = {{2015}}, } @inproceedings{16260, author = {{Lauter, C. and Wang, Z. and Tröster, Thomas and Brandis, R. and Köchling, D.}}, location = {{Lisbon, Portugal}}, title = {{{Methodology for the Product Engineering of Lightweight Structures in Multi-Material Design}}}, year = {{2015}}, } @inproceedings{16261, author = {{Leuders, S. and Meiners, S. and Taube, A. and Tröster, Thomas and Niendorf, T.}}, location = {{San Diego, USA}}, title = {{{Fatigue Behaviour of a Structural Component Manufactured by Selective Laser Melting and Investment Casting}}}, year = {{2015}}, } @inproceedings{16263, author = {{Wingenbach, Nils and Tröster, Thomas}}, location = {{Stuttgart}}, title = {{{Material follows form follows function}}}, year = {{2015}}, } @article{31291, abstract = {{We consider a simple model of an open partially expanding map. Its trapped set ${\mathcal{K}}$ in phase space is a fractal set. We first show that there is a well-defined discrete spectrum of Ruelle resonances which describes the asymptotic of correlation functions for large time and which is parametrized by the Fourier component $\unicode[STIX]{x1D708}$ in the neutral direction of the dynamics. We introduce a specific hypothesis on the dynamics that we call ‘minimal captivity’. This hypothesis is stable under perturbations and means that the dynamics is univalued in a neighborhood of ${\mathcal{K}}$. Under this hypothesis we show the existence of an asymptotic spectral gap and a fractal Weyl law for the upper bound of density of Ruelle resonances in the semiclassical limit $\unicode[STIX]{x1D708}\rightarrow \infty$. Some numerical computations with the truncated Gauss map and Bowen–Series maps illustrate these results.}}, author = {{ARNOLDI, JEAN FRANCOIS and FAURE, FRÉDÉRIC and Weich, Tobias}}, issn = {{0143-3857}}, journal = {{Ergodic Theory and Dynamical Systems}}, keywords = {{Applied Mathematics, General Mathematics}}, number = {{1}}, pages = {{1--58}}, publisher = {{Cambridge University Press (CUP)}}, title = {{{Asymptotic spectral gap and Weyl law for Ruelle resonances of open partially expanding maps}}}, doi = {{10.1017/etds.2015.34}}, volume = {{37}}, year = {{2015}}, } @article{31293, author = {{Weich, Tobias}}, issn = {{0010-3616}}, journal = {{Communications in Mathematical Physics}}, keywords = {{Mathematical Physics, Statistical and Nonlinear Physics}}, number = {{2}}, pages = {{727--765}}, publisher = {{Springer Science and Business Media LLC}}, title = {{{Resonance Chains and Geometric Limits on Schottky Surfaces}}}, doi = {{10.1007/s00220-015-2359-z}}, volume = {{337}}, year = {{2015}}, } @misc{51269, abstract = {{Free networks are established and maintained by more and more people on a voluntary basis to be independent from commercial providers. This also enables an uncensored communication and leads to a network owned by a community. Freifunk is such a project and it is based on wireless mesh networks. All participants provide an own wifi router (node) for transferring data between different devices. The routing protocol used in the Freifunk network of Paderborn is called Better Approach To Mobile Ad-hoc Networking advanced (B.A.T.M.A.N. IV or Batman-adv). It uses so called Originator Messages (OGM) to announce the existence of a node and to measure the quality of different links in the network. The Freifunk network in Paderborn consists of about 800 nodes that periodically broadcast OGMs. This leads to a substantial base load of ∼25 GByte per month and node. Instead of performing modifications in the real network, I create a simulation model of the current network structure and implement version IV of the B.A.T.M.A.N. routing protocol. The model is validated by using data from the real network. Based on this model I propose and evaluate five different opportunities to improve the base load without impairing other functionality of the network. The simulation results show that a combination of two improvements can lead to a reduction up to 90 %.}}, author = {{Hardes, Tobias}}, title = {{{Performance Analysis and Simulation of a Freifunk Mesh Network in Paderborn using B.A.T.M.A.N Advanced}}}, year = {{2015}}, }