@misc{15489,
  author       = {{Claes, Leander and Steidl, Carolin and Hetkämper, Tim and Henning, Bernd}},
  publisher    = {{Cornell University}},
  title        = {{{Estimation of acoustic wave non-linearity in ultrasonic measurement systems}}},
  doi          = {{10.48550/arXiv.2001.05708}},
  year         = {{2020}},
}

@inbook{35811,
  author       = {{Biehler, Rolf and Durand-Guerrier, Viviane}},
  booktitle    = {{Proceedings of the Third Conference of the International Network for Didactic Research in University Mathematics (INDRUM 2020, 12-19 September 2020)}},
  editor       = {{Hausberger, T. and Bosch, M. and Chelloughi, F.}},
  keywords     = {{Number Theory, Algebra, Discrete Mathematics, Logic, Research in University Mathematics Edcuation}},
  pages        = {{283--287}},
  publisher    = {{University of Carthage and INDRUM}},
  title        = {{{University Mathematics Didactic Research on Number Theory, Algebra, Discrete Mathematics, Logic}}},
  year         = {{2020}},
}

@inbook{35829,
  author       = {{Kempen, Leander and Krämer, Sandra and Biehler, Rolf}},
  booktitle    = {{Proceedings of the Third Conference of the International Network for Didactic Research in University Mathematics (INDRUM 2020, 12-19 September 2020)}},
  editor       = {{Hausberger, T. and Bosch, M. and Chelloughi, F.}},
  pages        = {{358--367}},
  publisher    = {{University of Carthage and INDRUM}},
  title        = {{{Investigating high school graduates’ personal meaning of the notion of “mathematical proof”}}},
  year         = {{2020}},
}

@article{33594,
  author       = {{Rezat, Sebastian and Rezat, Sara}},
  journal      = {{Die Grundschulzeitschrift 320}},
  pages        = {{10--13}},
  title        = {{{Schulbücher. Werkzeuge zum Üben in den Fächern Deutsch und Mathematik}}},
  volume       = {{320}},
  year         = {{2020}},
}

@inbook{35821,
  author       = {{Budde, Lea and Frischemeier, Daniel and Biehler, Rolf and Fleischer, Franz Yannik and Gerstenberger, Dietrich and Podworny, Susanne and Schulte, Carsten}},
  booktitle    = {{New Skills in the Changing World of Statistics Education: Proceedings of the Roundtable conference of the International Association for Statistical Education (IASE), July 2020}},
  editor       = {{Arnold, P.}},
  publisher    = {{ISI/IASE}},
  title        = {{{Data Science Education in Secondary School: How to Develop Statistical Reasoning When Exploring Data Using CODAP}}},
  year         = {{2020}},
}

@inbook{35913,
  author       = {{Liebendörfer, Michael and Göller, Robin and Gildehaus, Lara and Kortemeyer, Jörg and Biehler, Rolf and Hochmuth, Reinhard and Ostsieker, Laura and Rode, Jana and Schaper, Niclas}},
  booktitle    = {{Proceedings of the Third Conference of the International Network for Didactic Research in University Mathematics (INDRUM 2020, 12-19 September 2020)}},
  editor       = {{Hausberger, T. and Bosch, M. and Chelloughi, F.}},
  publisher    = {{University of Carthage and INDRUM}},
  title        = {{{The role of learning strategies for performance in mathematics courses for engineers}}},
  year         = {{2020}},
}

@inbook{35912,
  author       = {{Lankeit, Elisa and Biehler, Rolf}},
  booktitle    = {{Proceedings of the Third Conference of the International Network for Didactic Research in University Mathematics (INDRUM 2020, 12-19 September 2020)}},
  editor       = {{Hausberger, T. and Bosch, M. and Chelloughi, F.}},
  publisher    = {{University of Carthage and INDRUM}},
  title        = {{{“I only know the absolute value function”–About students’ concept images and example spaces concerning continuity and differentiability}}},
  year         = {{2020}},
}

@inproceedings{20510,
  author       = {{Benz, Manuel and Krogh Kristensen, Erik and Luo, Linghui and P. Borges Jr., Nataniel and Bodden, Eric and Zeller, Andreas}},
  booktitle    = {{International Conference for Software Engineering (ICSE)}},
  title        = {{{Heaps'n Leaks: How Heap Snapshots Improve Android Taint Analysis}}},
  year         = {{2020}},
}

@article{20508,
  author       = {{Nguyen Quang Do, Lisa and Bodden, Eric}},
  journal      = {{IEEE Transactions on Software Engineering}},
  title        = {{{Explaining Static Analysis with Rule Graphs}}},
  year         = {{2020}},
}

@article{59686,
  abstract     = {{The monolithic growth of III–V materials directly on Si substrates provides a promising integration approach for passive and active silicon photonic integrated circuits but still faces great challenges in crystal quality due to misfit defect formation. Nano-ridge engineering is a new approach that enables the integration of III–V based devices on trench-patterned Si substrates with very high crystal quality. Using selective area growth, the III–V material is deposited into narrow trenches to reduce the dislocation defect density by aspect ratio trapping. The growth is continued out of the trench pattern and a box-shaped III–V nano-ridge is engineered by adjusting the growth parameters. A flat (001) GaAs nano-ridge surface enables the epitaxial integration of a common InGaAs/GaAs multi-quantum-well (MQW) structure as an optical gain medium to build a laser diode. In this study, a clear correlation is found between the photoluminescence (PL) lifetime, extracted from time-resolved photoluminescence (TRPL) measurements, with the InGaAs/GaAs nano-ridge size and defect density, which are both predefined by the nano-ridge related pattern trench width. Through the addition of an InGaP passivation layer, a MQW PL lifetime of up to 800 ps and 1000 ps is measured when pumped at 900 nm (only QWs were excited) and 800 nm (QWs + barrier excited), respectively. The addition of a bottom carrier blocking layer further increases this lifetime to ∼2.5ns (pumped at 800 nm), which clearly demonstrates the high crystal quality of the nano-ridge material. These TRPL measurements not only deliver quick and valuable feedback about the III–V material quality but also provide an important understanding for the heterostructure design and carrier confinement of the nano-ridge laser diode.}},
  author       = {{Shi, Yuting and Kreuzer, Lisa C. and Gerhardt, Nils Christopher and Pantouvaki, Marianna and Van Campenhout, Joris and Baryshnikova, Marina and Langer, Robert and Van Thourhout, Dries and Kunert, Bernardette}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  number       = {{10}},
  publisher    = {{AIP Publishing}},
  title        = {{{Time-resolved photoluminescence characterization of InGaAs/GaAs nano-ridges monolithically grown on 300 mm Si substrates}}},
  doi          = {{10.1063/1.5139636}},
  volume       = {{127}},
  year         = {{2020}},
}

@article{59685,
  abstract     = {{Introducing spin-polarized carriers in semiconductor lasers reveals an alternative path to realize room-temperature spintronic applications, beyond the usual magnetoresistive effects. Through carrier recombination, the angular momentum of the spin-polarized carriers is transferred to photons, thus leading to the circularly polarized emitted light. The intuition for the operation of such spin-lasers can be obtained from simple bucket and harmonic oscillator models, elucidating their steady-state and dynamic response, respectively. These lasers extend the functionalities of spintronic devices and exceed the performance of conventional (spin-unpolarized) lasers, including an order of magnitude faster modulation frequency. Surprisingly, this ultrafast operation relies on a short carrier spin relaxation time and a large anisotropy of the refractive index, both viewed as detrimental in spintronics and conventional lasers. Spin-lasers provide a platform to test novel concepts in spin devices and offer progress connected to the advances in more traditional areas of spintronics.}},
  author       = {{Žutić, Igor and Xu, Gaofeng and Lindemann, Markus and Faria Junior, Paulo E. and Lee, Jeongsu and Labinac, Velimir and Stojšić, Kristian and Sipahi, Guilherme M. and Hofmann, Martin R. and Gerhardt, Nils Christopher}},
  issn         = {{0038-1098}},
  journal      = {{Solid State Communications}},
  publisher    = {{Elsevier BV}},
  title        = {{{Spin-lasers: spintronics beyond magnetoresistance}}},
  doi          = {{10.1016/j.ssc.2020.113949}},
  volume       = {{316-317}},
  year         = {{2020}},
}

@article{59684,
  abstract     = {{<jats:p>In this paper, we present a confocal laser scanning holographic microscope for the investigation of buried structures. The multimodal system combines high diffraction limited resolution and high signal-to-noise-ratio with the ability of phase acquisition. The amplitude and phase imaging capabilities of the system are shown on a test target. For the investigation of buried integrated semiconductor structures, we expand our system with an optical beam induced current modality that provides additional structure-sensitive contrast. We demonstrate the performance of the multimodal system by imaging the buried structures of a microcontroller through the silicon backside of its housing in reflection geometry.</jats:p>}},
  author       = {{Schnitzler, Lena and Neutsch, Krisztian and Schellenberg, Falk and Hofmann, Martin R. and Gerhardt, Nils Christopher}},
  issn         = {{1559-128X}},
  journal      = {{Applied Optics}},
  number       = {{4}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Confocal laser scanning holographic microscopy of buried structures}}},
  doi          = {{10.1364/ao.403687}},
  volume       = {{60}},
  year         = {{2020}},
}

@inproceedings{39405,
  author       = {{Petrov, Dmitry and Hilleringmann, Ulrich}},
  booktitle    = {{2020 IEEE SENSORS}},
  publisher    = {{IEEE}},
  title        = {{{Water-based primary cell for powering of wireless sensors}}},
  doi          = {{10.1109/sensors47125.2020.9278891}},
  year         = {{2020}},
}

@inproceedings{51848,
  author       = {{Poeplau, M. and Ester, S. and Henning, B. and Wagner, T.}},
  booktitle    = {{Tagungsband}},
  publisher    = {{AMA Service GmbH, Von-Münchhausen-Str. 49, 31515 Wunstorf}},
  title        = {{{5.2.3 Zinkoxid als photostabiler Luminophor zur optischen Sauerstoffdetektion}}},
  doi          = {{10.5162/sensoren2019/5.2.3}},
  year         = {{2020}},
}

@inproceedings{23479,
  author       = {{Weizel, Maxim and Kaertner, Franz X. and Witzens, Jeremy and Scheytt, J. Christoph}},
  booktitle    = {{Photonic Networks; 21th ITG-Symposium}},
  location     = {{Online}},
  pages        = {{1--6}},
  publisher    = {{VDE}},
  title        = {{{Photonic Analog-to-Digital-Converters – Comparison of a MZM-Sampler with an Optoelectronic Switched-Emitter-Follower Sampler}}},
  year         = {{2020}},
}

@article{23747,
  author       = {{Witte, Thomas and Hanemann, Stefan and Sommerfeld, Herbert and Temmen, Katrin and Fechner, Sabine}},
  issn         = {{0944-5846}},
  journal      = {{CHEMKON}},
  keywords     = {{digital, technology, teacher education}},
  number       = {{4}},
  pages        = {{193--198}},
  title        = {{{Selbstbau eines digitalen Low-Cost-Fotometers für den Chemieunterricht}}},
  doi          = {{10.1002/ckon.201900026}},
  volume       = {{27}},
  year         = {{2020}},
}

@article{19313,
  abstract     = {{The increasingly simulation-driven design process of ultrasonic transducers requires several reliable parameters for the description of the material behaviour. Exact results can only be achieved when a single specimen is used in the identification process, which typically is prone to the problem of low sensitivities to certain material parameters and thus high uncertainties. Therefore, a custom electrode topology for increased sensitivity is proposed for a piezoceramic disc. The thereupon conducted measurements of the electric impedance can be used as a starting point for an inverse approach where an equivalent simulation model is used to identify fitting material parameters. An optimisation strategy based on a preliminary sensitivity analysis is presented that leads to a good agreement between measurement and simulation. Furthermore, the proposed measurement procedure is able to evaluate the quality of the simulation model. Hence, different frequency-dependent damping models are presented and evaluated.}},
  author       = {{Feldmann, Nadine and Schulze, Veronika and Claes, Leander and Jurgelucks, Benjamin and Walther, Andrea and Henning, Bernd}},
  issn         = {{2196-7113}},
  journal      = {{tm - Technisches Messen}},
  pages        = {{50--55}},
  title        = {{{Inverse piezoelectric material parameter characterization using a single disc-shaped specimen}}},
  doi          = {{10.1515/teme-2020-0012}},
  year         = {{2020}},
}

@inproceedings{20695,
  author       = {{Boeddeker, Christoph and Nakatani, Tomohiro and Kinoshita, Keisuke and Haeb-Umbach, Reinhold}},
  booktitle    = {{ICASSP 2020 - 2020 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)}},
  isbn         = {{9781509066315}},
  title        = {{{Jointly Optimal Dereverberation and Beamforming}}},
  doi          = {{10.1109/icassp40776.2020.9054393}},
  year         = {{2020}},
}

@inproceedings{29880,
  abstract     = {{Although there are numerous design methodologies for the LLC resonant converter, they often do not consider the possibility of input voltage adjustment. In the proposed concept, a modular multi-level converter (MMC) is used to step-down the three-phase medium voltage of 10 kV, and provide up to 1 MW of pure DC power to the load consisting of electrolyzers for hydrogen generation. Therefore, each module is extended by an LLC resonant converter to adapt to the specific electrolyzers DC voltage range of 142...220 V and to provide galvanic isolation. In order to achieve a high efficiency for a wide range of load conditions, the input voltage of the LLC converter is adjusted between 600 V and 770 V while operating at resonance or close to resonance. The parameters of the 11kW LLC resonant converter with an integrated leakage inductance are systematically optimized to maximize the efficiency for all loads while achieving zero-voltage switching. For a fast estimation of eddy current losses, a new method is proposed, which uses a single FEM simulation to fit newly developed loss equations. The calculated average efficiency is 97.8%. The prototype of the LLC converter reaches a peak efficiency of over 98% at resonance at half load which is similar to the precalculated value.}},
  author       = {{Unruh, Roland and Schafmeister, Frank and Böcker, Joachim}},
  booktitle    = {{2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)}},
  keywords     = {{Full-bridge, High voltage power converters, LLC resonant converter, Multilevel converters, ZVS Converters}},
  publisher    = {{IEEE}},
  title        = {{{11kW, 70kHz LLC Converter Design with Adaptive Input Voltage for 98% Efficiency in an MMC}}},
  doi          = {{10.1109/compel49091.2020.9265771}},
  year         = {{2020}},
}

@inproceedings{39966,
  author       = {{Förstner, Jens and Widhalm, A. and Mukherjee, A. and Krehs, S. and Jonas, B. and Spychala, K. and Förstner, Jens and Thiede, Andreas and Reuter, Dirk and Zrenner, Artur}},
  booktitle    = {{11th International Conference on Quantum Dots}},
  title        = {{{Ultrafast electric control of a single QD exciton}}},
  year         = {{2020}},
}