@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}}, } @article{47485, abstract = {{In creating a Hybrid Edition of Justine Favart’s and Adolphe Blaise’s Annette et Lubin, a ‹comédie en vaudevilles› that premiered in Paris at the Comédie-Italienne in early 1762, for the OPERA series, the authors explore new ways of editing opera by means of XML/Edirom technology. In the light of Patrick Sahle’s account of edition as hypertext (chapter „Edition als Hypertext“ in Digitale Editionsformen, 2013), the paper focusses on the ‹timbre› indications inherent to the literary text, proposes an understanding of the ‹timbres› that is quite close to what we know as hyperlinks in the age of hypertext, and discusses, from a firmly pragmatic standpoint, the editors’ handling of what one might regard as abundance of hyperlinks. Constructing a historical-critical edition implies, of course, all ‘traditional’ tasks of philological groundwork. But beyond this, today, defining the concept of and programming a vast number of digital links are part of an editor’s core activities: editorially controlled representations of connections inherent to the text, both on the philological, and the historical level.}}, author = {{Droese, Janine and Münzmay, Andreas}}, issn = {{1865-9446}}, journal = {{Editio. Internationales Jahrbuch für Editionswissenschaft}}, keywords = {{Musicology}}, pages = {{85 -- 102}}, publisher = {{de Gruyter}}, title = {{{Pfade im editorischen Netz. Überlegungen zur Pragmatik des editorischen Hyperlinks am Beispiel der Comédie en vaudevilles Annette et Lubin (1762)}}}, doi = {{10.1515/editio-2015-007}}, volume = {{29}}, year = {{2015}}, } @article{10030, abstract = {{The vibrational properties of stoichiometric LiNbO3 are analyzed within density-functional perturbation theory in order to obtain the complete phonon dispersion of the material. The phonon density of states of the ferroelectric (paraelectric) phase shows two (one) distinct band gaps separating the high-frequency (~800 cm−1) optical branches from the continuum of acoustic and lower optical phonon states. This result leads to specific heat capacites in close agreement with experimental measurements in the range 0–350 K and a Debye temperature of 574 K. The calculated zero-point renormalization of the electronic Kohn–Sham eigenvalues reveals a strong dependence on the phonon wave vectors, especially near Γ. Integrated over all phonon modes, our results indicate a vibrational correction of the electronic band gap of 0.41 eV at 0 K, which is in excellent agreement with the extrapolated temperature-dependent measurements.}}, author = {{Friedrich, Michael and Riefer, Arthur and Sanna, Simone and Schmidt, Wolf Gero and Schindlmayr, Arno}}, issn = {{1361-648X}}, journal = {{Journal of Physics: Condensed Matter}}, number = {{38}}, publisher = {{IOP Publishing}}, title = {{{Phonon dispersion and zero-point renormalization of LiNbO3 from density-functional perturbation theory}}}, doi = {{10.1088/0953-8984/27/38/385402}}, volume = {{27}}, year = {{2015}}, } @article{13504, author = {{Sanna, S. and Dues, C. and Schmidt, Wolf Gero}}, issn = {{0927-0256}}, journal = {{Computational Materials Science}}, pages = {{145--150}}, title = {{{Modeling atomic force microscopy at LiNbO 3 surfaces from first-principles}}}, doi = {{10.1016/j.commatsci.2015.03.025}}, volume = {{103}}, year = {{2015}}, } @article{13506, author = {{Sanson, A. and Zaltron, A. and Argiolas, N. and Sada, C. and Bazzan, M. and Schmidt, Wolf Gero and Sanna, S.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, title = {{{Polaronic deformation at theFe2+/3+impurity site inFe:LiNbO3crystals}}}, doi = {{10.1103/physrevb.91.094109}}, volume = {{91}}, year = {{2015}}, } @article{13507, author = {{Landmann, M. and Rauls, E. and Schmidt, Wolf Gero and Neumann, M. D. and Speiser, E. and Esser, N.}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, title = {{{GaNm-plane: Atomic structure, surface bands, and optical response}}}, doi = {{10.1103/physrevb.91.035302}}, volume = {{91}}, year = {{2015}}, } @article{4330, abstract = {{Sources of single photons are key elements for applications in quantum information science. Among the different sources available, semiconductor quantum dots excel with their integrability in semiconductor on-chip solutions and the potential that photon emission can be triggered on demand. Usually, the photon is emitted from a single-exciton ground state. Polarization of the photon and time of emission are either probabilistic or pre-determined by electronic properties of the system. Here, we study the direct two-photon emission from the biexciton. The two-photon emission is enabled by a laser pulse driving the system into a virtual state inside the band gap. From this intermediate state, the single photon of interest is then spontaneously emitted. We show that emission through this higher-order transition provides a versatile approach to generate a single photon. Through the driving laser pulse, polarization state, frequency and emission time of the photon can be controlled on-the-fly.}}, author = {{Heinze, Dirk and Breddermann, Dominik and Zrenner, Artur and Schumacher, Stefan}}, issn = {{2041-1723}}, journal = {{Nature Communications}}, number = {{1}}, publisher = {{Springer Nature}}, title = {{{A quantum dot single-photon source with on-the-fly all-optical polarization control and timed emission}}}, doi = {{10.1038/ncomms9473}}, volume = {{6}}, year = {{2015}}, } @phdthesis{28217, author = {{Münch, Eckehard}}, isbn = {{978-3-942647-40-3}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Selbstoptimierung verteilter mechatronischer Systeme auf Basis paretooptimaler Systemkonfigurationen}}}, volume = {{321}}, year = {{2014}}, } @phdthesis{28219, author = {{Renken, Hendrik}}, isbn = {{978-3-942647-41-0}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Acceleration of Material Flow Simulations - Using Model Coarsening by Token Sampling and Online Error Estimation and Accumulation Controlling}}}, volume = {{322}}, year = {{2014}}, } @phdthesis{28220, author = {{Hartmann, P.}}, isbn = {{978-3-942647-50-2}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Ein Beitrag zur Verhaltensantizipation und -regelung kognitiver mechatronischer Systeme bei langfristiger Planung und Ausführung}}}, volume = {{331}}, year = {{2014}}, } @misc{28221, author = {{Gausemeier, Jürgen}}, isbn = {{978-3-942647-53-3}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Vorausschau und Technologieplanung. 10. Symposium für Vorausschau und Technologieplanung, Heinz Nixdorf Institut, 20. und 21. November 2014}}}, volume = {{334}}, year = {{2014}}, }