@article{58083, author = {{Yaremkevich, Dmytro D. and Scherbakov, Alexey V. and Kukhtaruk, Serhii M. and Linnik, Tetiana L. and Khokhlov, Nikolay E. and Godejohann, Felix and Dyatlova, Olga A. and Nadzeyka, Achim and Pattnaik, Debi P. and Wang, Mu and Roy, Syamashree and Campion, Richard P. and Rushforth, Andrew W. and Gusev, Vitalyi E. and Akimov, Andrey V. and Bayer, Manfred }}, journal = {{ACS Nano}}, number = {{3}}, title = {{{Protected Long-Distance Guiding of Hypersound Underneath a Nanocorrugated Surface}}}, doi = {{10.1021/acsnano.0c09475}}, volume = {{15}}, year = {{2021}}, } @article{58084, author = {{Rolle, Konrad and Yaremkevich, Dmytro and Scherbakov, Alexey V. and Bayer, Manfred and Fytas, George }}, journal = {{Nature Scientific Reports}}, title = {{{Lifting restrictions on coherence loss when characterizing non-transparent hypersonic phononic crystals}}}, doi = {{10.1038/s41598-021-96663-3}}, volume = {{11}}, year = {{2021}}, } @article{21362, author = {{Xue, Yan and Chestnov, Igor and Sedov, Evgeny and Kiktenko, Evgeniy and Fedorov, Aleksey K. and Schumacher, Stefan and Ma, Xuekai and Kavokin, Alexey}}, issn = {{2643-1564}}, journal = {{Physical Review Research}}, number = {{1}}, title = {{{Split-ring polariton condensates as macroscopic two-level quantum systems}}}, doi = {{10.1103/physrevresearch.3.013099}}, volume = {{3}}, year = {{2021}}, } @article{21359, author = {{Barkhausen, Franziska and Pukrop, Matthias and Schumacher, Stefan and Ma, Xuekai}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{7}}, title = {{{Structuring coflowing and counterflowing currents of polariton condensates in concentric ring-shaped and elliptical potentials}}}, doi = {{10.1103/physrevb.103.075305}}, volume = {{103}}, year = {{2021}}, } @article{29747, author = {{Jurgen von Bardeleben, Hans and Cantin, Jean-Louis and Gerstmann, Uwe and Schmidt, Wolf Gero and Biktagirov, Timur}}, issn = {{1530-6984}}, journal = {{Nano Letters}}, keywords = {{Mechanical Engineering, Condensed Matter Physics, General Materials Science, General Chemistry, Bioengineering}}, number = {{19}}, pages = {{8119--8125}}, publisher = {{American Chemical Society (ACS)}}, title = {{{Spin Polarization, Electron–Phonon Coupling, and Zero-Phonon Line of the NV Center in 3C-SiC}}}, doi = {{10.1021/acs.nanolett.1c02564}}, volume = {{21}}, year = {{2021}}, } @article{22010, author = {{Aldahhak, Hazem and Hogan, Conor and Lindner, Susi and Appelfeller, Stephan and Eisele, Holger and Schmidt, Wolf Gero and Dähne, Mario and Gerstmann, Uwe and Franz, Martin}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, pages = {{035303}}, title = {{{Electronic structure of the Si(111)3×3R30∘−B surface from theory and photoemission spectroscopy}}}, doi = {{10.1103/physrevb.103.035303}}, volume = {{103}}, year = {{2021}}, } @inproceedings{40374, abstract = {{We present a frequency multimode integrated SU (1,1) interferometer with a polarization converter and strong signal-idler photon correlations. Phase sensitivity below the shot noise limit is demonstrated, various filtering and seeding strategies are discussed.}}, author = {{Ferreri, A. and Santandrea, Matteo and Stefszky, Michael and Luo, Kai Hong and Herrmann, Harald and Silberhorn, Christine and Sharapova, Polina}}, booktitle = {{Conference on Lasers and Electro-Optics}}, publisher = {{Optica Publishing Group}}, title = {{{Multimode integrated SU(1,1) interferometer}}}, doi = {{10.1364/cleo_qels.2021.ftu1n.6}}, year = {{2021}}, } @phdthesis{24771, abstract = {{Im Rahmen dieser Arbeit wird das additive Fertigungsverfahren Fused Deposition Modeling (FDM) hinsichtlich der erzielbaren Bauteilqualität untersucht. Der Fokus liegt auf den mechanischen und geometrischen Eigenschaften für Bauteile aus ABS-M30. Hierzu erfolgt eine grundlegende Eruierung aller Einflussfaktoren auf die Bauteilqualität. Die Einflussfaktoren, die von besonderer Bedeutung sind, werden mithilfe von experimentellen Untersuchungen genauer analysiert. Ein wichtiges Merkmal im FDM-Prozess ist die Temperatur und die Luftströmung im Bauraum der Fertigungsmaschine, sodass neben der Ermittlung des Istzustandes auch eine Optimierung dieser erarbeitet wird. In den weiteren Hauptkapiteln wird neben dem Einfluss der Temperatur und Luftströmung auch der Einfluss der Strangablagestrategie untersucht. Die Strangablagestrategie kann zu einer gezielten Verbesserung der mechanischen Eigenschaften von FDM-Bauteilen genutzt werden. Die Einflüsse der Strangablagestrategie auf die geometrischen Bauteileigenschaften werden in Form von Maß- und Formabweichungen ermittelt. Ein weiteres Ziel dieser Arbeit ist die grundlegende Analyse über die Ursache von Maßabweichungen an FDM-Probekörpern. Zur Reduzierung der auftretenden Maßabweichungen, wird eine Methode erarbeitet, die zur Bestimmung von optimierten Schwindungsfaktoren dient. Die optimierten Schwindungsfaktoren werden genutzt, um die Maßabweichungen an FDM-Bauteilen maßgeblich zu reduzieren. }}, author = {{Knoop, Frederick}}, isbn = {{978-3-8440-7342-3}}, pages = {{202}}, publisher = {{Shaker Verlag}}, title = {{{Untersuchung der mechanischen und geometrischen Eigenschaften von Bauteilen hergestellt im Fused Deposition Modeling Verfahren}}}, volume = {{18}}, year = {{2020}}, } @phdthesis{24773, abstract = {{Mit seiner Eignung für den Einsatz in Luftfahrzeugen stellt vor allem der Werkstoff Ultem 9085 in Verbindung mit der Verarbeitbarkeit im Fused Deposition Modeling (FDM) Prozesses ein großes Potential für die Kleinserienfertigung mittels additiver Fertigungstechnologien im Luftfahrtbereich dar. Hier bestehen aufgrund der Schichtbauweise Herausforderungen zur Optimierung der Oberflächenqualität. Des Weiteren ist das Ermüdungsverhalten von FDM-Strukturen noch unzureichend erforscht. Mit dem Schwerpunkt auf dem Werkstoff Ultem 9085 sind im Rahmen dieser Dissertation zunächst Nachbehandlungsmethoden zur Verbesserung der Oberflächenqualität analysiert worden. Hier konnten Oberflächenrauheiten durch den Einsatz eines chemischen Nachbehandlungsprozesses um bis zu 80 % reduziert werden. Die dabei als Nebeneffekt erzeugte Schließung der porösen Oberflächenstruktur begünstigte zudem einen anschließenden Metallisierungsprozess zur Veredelung der Oberflächenstruktur. Die Ermüdungseigenschaften fallen für FDM-Strukturen aufgrund der inneren und äußeren Kerben im Vergleich zu spritzgegossenen Substraten vergleichsweise gering aus. Durch Überfüllung der Bau-teile und gezielte Strangorientierungen kann die Lebensdauer insbesondere für seitlich und flach aufgebaute Zugprüfkörper erhöht werden. Der chemische Nachbehandlungsprozess wirkt sich durch die Reduzierung von äußeren Kerben vor allem positiv auf die mechanischen Eigenschaften von aufrecht hergestellten Strukturen aus.}}, author = {{Fischer, Matthias}}, isbn = {{978-3-8440-7281-5}}, pages = {{150}}, publisher = {{Shaker Verlag}}, title = {{{Oberflächennachbehandlung beim Fused Deposition Modeling – Analyse der Oberflächenstruktur und mechanischer Kennwerte}}}, volume = {{17}}, year = {{2020}}, } @techreport{24943, author = {{Menge, Dennis and Klippstein, Sven Helge and Schmid, Hans-Joachim}}, pages = {{130}}, title = {{{Additive Leichtbaustrukturen für die Flugzeugkabine}}}, year = {{2020}}, } @article{25301, author = {{Scherer, Beate and Kottenstedde, Ingo Leonard and Bremser, Wolfgang and Matysik, Frank-Michael}}, issn = {{0142-9418}}, journal = {{Polymer Testing}}, title = {{{Analytical characterization of polyamide 11 used in the context of selective laser sintering: Physico-chemical correlations}}}, doi = {{10.1016/j.polymertesting.2020.106786}}, year = {{2020}}, } @inproceedings{19606, abstract = {{Mobile shopping apps have been using Augmented Reality (AR) in the last years to place their products in the environment of the customer. While this is possible with atomic 3D objects, there is is still a lack in the runtime configuration of 3D object compositions based on user needs and environmental constraints. For this, we previously developed an approach for model-based AR-assisted product configuration based on the concept of Dynamic Software Product Lines. In this demonstration paper, we present the corresponding tool support ProConAR in the form of a Product Modeler and a Product Configurator. While the Product Modeler is an Angular web app that splits products (e.g. table) up into atomic parts (e.g. tabletop, table legs, funnier) and saves it within a configuration model, the Product Configurator is an Android client that uses the configuration model to place different product configurations within the environment of the customer. We show technical details of our ready to use tool-chain ProConAR by describing its implementation and usage as well as pointing out future research directions.}}, author = {{Gottschalk, Sebastian and Yigitbas, Enes and Schmidt, Eugen and Engels, Gregor}}, booktitle = {{Human-Centered Software Engineering. HCSE 2020}}, editor = {{Bernhaupt, Regina and Ardito, Carmelo and Sauer, Stefan}}, keywords = {{Product Configuration, Augmented Reality, Model-based, Tool Support}}, location = {{Eindhoven}}, publisher = {{Springer}}, title = {{{ProConAR: A Tool Support for Model-based AR Product Configuration}}}, doi = {{10.1007/978-3-030-64266-2_14}}, volume = {{12481}}, year = {{2020}}, } @inproceedings{19632, author = {{Jovanovikj, Ivan and Yigitbas, Enes and Sauer, Stefan and Engels, Gregor}}, booktitle = {{Proceedings of the 8th International Working Conference on Human-Centered Software Engineering (HCSE'20)}}, pages = {{216--224}}, publisher = {{Springer}}, title = {{{Augmented and Virtual Reality Object Repository for Rapid Prototyping }}}, year = {{2020}}, } @article{20189, abstract = {{A dielectric step-index optical fiber with tube-like profile is considered, being positioned with a small gap on top of a dielectric slab waveguide. We propose a 2.5-D hybrid analytical/numerical coupled mode model for the evanescent excitation of the tube through semi-guided waves propagating in the slab at oblique angles. The model combines the directional polarized modes supported by the slab with analytic solutions for the TE-, TM-, and orbital-angular-momentum (OAM) modes of the tube-shaped fiber. Implementational details of the scheme are discussed, complemented by finite-element simulations for verification purposes. Our results include configurations with resonant in-fiber excitation of OAM modes with large orbital angular momentum and strong field enhancement.}}, author = {{Hammer, Manfred and Ebers, Lena and Förstner, Jens}}, issn = {{0306-8919}}, journal = {{Optical and Quantum Electronics}}, keywords = {{tet_topic_waveguides}}, title = {{{Hybrid coupled mode modelling of the evanescent excitation of a dielectric tube by semi-guided waves at oblique angles}}}, doi = {{10.1007/s11082-020-02595-z}}, volume = {{52}}, year = {{2020}}, } @inproceedings{20191, author = {{Hemsen, Paul and Hesse, Marc and Löken, Nils and Nouri, Zahra}}, booktitle = {{2nd Crowdworking Symposium}}, location = {{Paderborn}}, title = {{{Platform-independent Reputation and Qualification System for Crowdwork}}}, year = {{2020}}, } @article{20233, abstract = {{The challenge of designing new tunable nonlinear dielectric materials with tailored properties has attracted an increasing amount of interest recently. Herein, we study the effective nonlinear dielectric response of a stochastic paraelectric-dielectric composite consisting of equilibrium distributions of circular and partially penetrable disks (or parallel, infinitely long, identical, partially penetrable, circular cylinders) of a dielectric phase randomly dispersed in a continuous matrix of a paraelectric phase. The random microstructures were generated using the Metropolis Monte Carlo algorithm. The evaluation of the effective permittivity and tunability were carried out by employing either a Landau thermodynamic model or its Johnson’s approximation to describe the field-dependent permittivity of the paraelectric phase and solving continuum-electrostatics equations using finite element calculations. We reveal that the percolation threshold in this composite governs the critical behavior of the effective permittivity and tunability. For microstructures below the percolation threshold, our simulations demonstrate a strong nonlinear behaviour of the field-dependent effective permittivity and very high tunability that increases as a function of dielectric phase concentration. Above the percolation threshold, the effective permittivity shows the tendency to linearization and the tunability dramatically drops down. The highly reduced permittivity and extraordinarily high tunability are obtained for the composites with dielectric impenetrable disks at high concentrations, in which the triggering of the percolation transition is avoided. The reported results cast light on distinct nonlinear behaviour of 2D and 3D stochastic composites and can guide the design of novel composites with the controlled morphology and tailored permittivity and tunability.}}, author = {{Myroshnychenko, Viktor and Smirnov, Stanislav and Jose, Pious Mathews Mulavarickal and Brosseau, Christian and Förstner, Jens}}, issn = {{1359-6454}}, journal = {{Acta Materialia}}, pages = {{116432}}, title = {{{Nonlinear dielectric properties of random paraelectric-dielectric composites}}}, doi = {{10.1016/j.actamat.2020.10.051}}, volume = {{203}}, year = {{2020}}, } @phdthesis{28367, author = {{Echterfeld, Julian}}, isbn = {{978-3-947647-12-5}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Systematik zur Digitalisierung von Produktprogrammen}}}, volume = {{393}}, year = {{2020}}, } @phdthesis{28369, author = {{Lukei, Meinolf}}, isbn = {{978-3-947647-14-9}}, publisher = {{Verlagsschriftenreihe des Heinz Nixdorf Instituts, Paderborn}}, title = {{{Systematik zur integrativen Entwicklung von mechatronischen Produkten und deren Prüfmittel}}}, volume = {{395}}, year = {{2020}}, } @misc{24133, author = {{Schöppner, Volker and Austermeier, Laura and Dietl, Kilian}}, booktitle = {{Blasformen & Extrusionswerkzeuge}}, keywords = {{Compoundieren, Doppenschneckenextruder, Energieeintrag}}, pages = {{7}}, title = {{{Der richtige Dreh für Simulationen}}}, year = {{2020}}, } @misc{24134, author = {{Schöppner, Volker and Austermeier, Laura and Dietl, Kilian}}, booktitle = {{K Zeitung}}, keywords = {{Compoundieren, Doppenschneckenextruder, Energieeintrag}}, title = {{{SKZ simuliert Doppelschnecke}}}, year = {{2020}}, }