@article{33646,
  author       = {{Majumdar, I. and Sahoo, S.K. and Parvan, V. and Mirhosseini, Hossein and Chacko, B. and Wang, Y. and Greiner, D. and Kühne, Thomas and Schlatmann, R. and Lauermann, I.}},
  issn         = {{0169-4332}},
  journal      = {{Applied Surface Science}},
  keywords     = {{Surfaces, Coatings and Films, Condensed Matter Physics, Surfaces and Interfaces, General Physics and Astronomy, General Chemistry}},
  publisher    = {{Elsevier BV}},
  title        = {{{Effects of KF and RbF treatments on Cu(In,Ga)Se2-based solar cells: A combined photoelectron spectroscopy and DFT study}}},
  doi          = {{10.1016/j.apsusc.2020.148085}},
  volume       = {{538}},
  year         = {{2020}},
}

@article{35723,
  abstract     = {{<jats:p>The development of renewable energies and smart mobility has profoundly impacted the future of the distribution grid. An increasing bidirectional energy flow stresses the assets of the distribution grid, especially medium voltage switchgear. This calls for improved maintenance strategies to prevent critical failures. Predictive maintenance, a maintenance strategy relying on current condition data of assets, serves as a guideline. Novel sensors covering thermal, mechanical, and partial discharge aspects of switchgear, enable continuous condition monitoring of some of the most critical assets of the distribution grid. Combined with machine learning algorithms, the demands put on the distribution grid by the energy and mobility revolutions can be handled. In this paper, we review the current state-of-the-art of all aspects of condition monitoring for medium voltage switchgear. Furthermore, we present an approach to develop a predictive maintenance system based on novel sensors and machine learning. We show how the existing medium voltage grid infrastructure can adapt these new needs on an economic scale.</jats:p>}},
  author       = {{Hoffmann, Martin W. and Wildermuth, Stephan and Gitzel, Ralf and Boyaci, Aydin and Gebhardt, Jörg and Kaul, Holger and Amihai, Ido and Forg, Bodo and Suriyah, Michael and Leibfried, Thomas and Stich, Volker and Hicking, Jan and Bremer, Martin and Kaminski, Lars and Beverungen, Daniel and zur Heiden, Philipp and Tornede, Tanja}},
  issn         = {{1424-8220}},
  journal      = {{Sensors}},
  keywords     = {{Electrical and Electronic Engineering, Biochemistry, Instrumentation, Atomic and Molecular Physics, and Optics, Analytical Chemistry}},
  number       = {{7}},
  publisher    = {{MDPI AG}},
  title        = {{{Integration of Novel Sensors and Machine Learning for Predictive Maintenance in Medium Voltage Switchgear to Enable the Energy and Mobility Revolutions}}},
  doi          = {{10.3390/s20072099}},
  volume       = {{20}},
  year         = {{2020}},
}

@article{34093,
  author       = {{Riedl, Thomas and Kunnathully, V. S. and Trapp, A. and Langer, T. and Reuter, Dirk and Lindner, Jörg}},
  issn         = {{2475-9953}},
  journal      = {{Physical Review Materials}},
  keywords     = {{Physics and Astronomy (miscellaneous), General Materials Science}},
  number       = {{1}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{Strain-driven InAs island growth on top of GaAs(111) nanopillars}}},
  doi          = {{10.1103/physrevmaterials.4.014602}},
  volume       = {{4}},
  year         = {{2020}},
}

@article{34088,
  author       = {{Bürger, Julius and Riedl, Thomas and Lindner, Jörg}},
  issn         = {{0304-3991}},
  journal      = {{Ultramicroscopy}},
  keywords     = {{Instrumentation, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
  publisher    = {{Elsevier BV}},
  title        = {{{Influence of lens aberrations, specimen thickness and tilt on differential phase contrast STEM images}}},
  doi          = {{10.1016/j.ultramic.2020.113118}},
  volume       = {{219}},
  year         = {{2020}},
}

@article{34091,
  author       = {{Kunnathully, Vinay S. and Riedl, Thomas and Trapp, Alexander and Langer, Timo and Reuter, Dirk and Lindner, Jörg}},
  issn         = {{0022-0248}},
  journal      = {{Journal of Crystal Growth}},
  keywords     = {{Materials Chemistry, Inorganic Chemistry, Condensed Matter Physics}},
  publisher    = {{Elsevier BV}},
  title        = {{{InAs heteroepitaxy on nanopillar-patterned GaAs (111)A}}},
  doi          = {{10.1016/j.jcrysgro.2020.125597}},
  volume       = {{537}},
  year         = {{2020}},
}

@article{34090,
  author       = {{Riedl, Thomas and Lindner, Jörg}},
  issn         = {{0038-1098}},
  journal      = {{Solid State Communications}},
  keywords     = {{Materials Chemistry, Condensed Matter Physics, General Chemistry}},
  publisher    = {{Elsevier BV}},
  title        = {{{Applicability of molecular statics simulation to partial dislocations in GaAs}}},
  doi          = {{10.1016/j.ssc.2020.113927}},
  volume       = {{314-315}},
  year         = {{2020}},
}

@article{34089,
  author       = {{Riedl, Thomas and Lindner, Jörg}},
  issn         = {{0038-1098}},
  journal      = {{Solid State Communications}},
  keywords     = {{Materials Chemistry, Condensed Matter Physics, General Chemistry}},
  publisher    = {{Elsevier BV}},
  title        = {{{Applicability of molecular statics simulation to partial dislocations in GaAs}}},
  doi          = {{10.1016/j.ssc.2020.113927}},
  volume       = {{314-315}},
  year         = {{2020}},
}

@article{47958,
  abstract     = {{High-fidelity periodic poling over long lengths is required for robust, quasi-phase-matched second-harmonic generation using the fundamental, quasi-TE polarized waveguide modes in a thin-film lithium niobate (TFLN) waveguide. Here, a shallow-etched ridge waveguide is fabricated in x-cut magnesium oxide doped TFLN and is poled accurately over 5 mm. The high fidelity of the poling is demonstrated over long lengths using a non-destructive technique of confocal scanning second-harmonic microscopy. We report a second-harmonic conversion efficiency of up to 939 %/W (length-normalized conversion efficiency 3757 %/Wcm²), measured at telecommunications wavelengths. The device demonstrates a narrow spectral linewidth (1 nm) and can be tuned precisely with a tuning characteristic of 0.1 nm/°C, over at least 40 °C without measurable loss of efficiency.}},
  author       = {{Zhao, Jie and Rüsing, Michael and Javid, Usman A. and Ling, Jingwei and Li, Mingxiao and Lin, Qiang and Mookherjea, Shayan}},
  issn         = {{1094-4087}},
  journal      = {{Optics Express}},
  keywords     = {{Atomic and Molecular Physics, and Optics}},
  number       = {{13}},
  publisher    = {{Optica Publishing Group}},
  title        = {{{Shallow-etched thin-film lithium niobate waveguides for highly-efficient second-harmonic generation}}},
  doi          = {{10.1364/oe.395545}},
  volume       = {{28}},
  year         = {{2020}},
}

@article{47955,
  abstract     = {{Quasi-phase-matched grating structures in lithium niobate waveguides with sub-micrometer periodicities will benefit the development of short-wavelength nonlinear optical devices. Here, we report on the reproducible formation of periodically poled domains in x-cut single-crystalline thin-film lithium niobate with periodicities as short as 600 nm. Shaped single-voltage poling pulses were applied to electrode structures that were fabricated by a combination of electron-beam and direct-writing laser lithography. Evidence of successful poling with good quality was obtained through second-harmonic microscopy and piezoresponse force microscopy imaging. For the sub-micrometer period structures, we observed patterns with a double periodicity formed by domain interactions and features with sizes <200 nm.}},
  author       = {{Zhao, Jie and Rüsing, Michael and Roeper, Matthias and Eng, Lukas M. and Mookherjea, Shayan}},
  issn         = {{0021-8979}},
  journal      = {{Journal of Applied Physics}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{19}},
  publisher    = {{AIP Publishing}},
  title        = {{{Poling thin-film x-cut lithium niobate for quasi-phase matching with sub-micrometer periodicity}}},
  doi          = {{10.1063/1.5143266}},
  volume       = {{127}},
  year         = {{2020}},
}

@article{47952,
  author       = {{Zhao, Jie and Ma, Chaoxuan and Rüsing, Michael and Mookherjea, Shayan}},
  issn         = {{0031-9007}},
  journal      = {{Physical Review Letters}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{16}},
  publisher    = {{American Physical Society (APS)}},
  title        = {{{High Quality Entangled Photon Pair Generation in Periodically Poled Thin-Film Lithium Niobate Waveguides}}},
  doi          = {{10.1103/physrevlett.124.163603}},
  volume       = {{124}},
  year         = {{2020}},
}

@inproceedings{48850,
  abstract     = {{Sequential model-based optimization (SMBO) approaches are algorithms for solving problems that require computationally or otherwise expensive function evaluations. The key design principle of SMBO is a substitution of the true objective function by a surrogate, which is used to propose the point(s) to be evaluated next. SMBO algorithms are intrinsically modular, leaving the user with many important design choices. Significant research efforts go into understanding which settings perform best for which type of problems. Most works, however, focus on the choice of the model, the acquisition function, and the strategy used to optimize the latter. The choice of the initial sampling strategy, however, receives much less attention. Not surprisingly, quite diverging recommendations can be found in the literature. We analyze in this work how the size and the distribution of the initial sample influences the overall quality of the efficient global optimization (EGO) algorithm, a well-known SMBO approach. While, overall, small initial budgets using Halton sampling seem preferable, we also observe that the performance landscape is rather unstructured. We furthermore identify several situations in which EGO performs unfavorably against random sampling. Both observations indicate that an adaptive SMBO design could be beneficial, making SMBO an interesting test-bed for automated algorithm design.}},
  author       = {{Bossek, Jakob and Doerr, Carola and Kerschke, Pascal}},
  booktitle    = {{Proceedings of the Genetic and Evolutionary Computation Conference}},
  isbn         = {{978-1-4503-7128-5}},
  keywords     = {{continuous black-box optimization, design of experiments, initial design, sequential model-based optimization}},
  pages        = {{778–786}},
  publisher    = {{Association for Computing Machinery}},
  title        = {{{Initial Design Strategies and Their Effects on Sequential Model-Based Optimization: An Exploratory Case Study Based on BBOB}}},
  doi          = {{10.1145/3377930.3390155}},
  year         = {{2020}},
}

@inproceedings{48897,
  abstract     = {{In this work we focus on the well-known Euclidean Traveling Salesperson Problem (TSP) and two highly competitive inexact heuristic TSP solvers, EAX and LKH, in the context of per-instance algorithm selection (AS). We evolve instances with nodes where the solvers show strongly different performance profiles. These instances serve as a basis for an exploratory study on the identification of well-discriminating problem characteristics (features). Our results in a nutshell: we show that even though (1) promising features exist, (2) these are in line with previous results from the literature, and (3) models trained with these features are more accurate than models adopting sophisticated feature selection methods, the advantage is not close to the virtual best solver in terms of penalized average runtime and so is the performance gain over the single best solver. However, we show that a feature-free deep neural network based approach solely based on visual representation of the instances already matches classical AS model results and thus shows huge potential for future studies.}},
  author       = {{Seiler, Moritz and Pohl, Janina and Bossek, Jakob and Kerschke, Pascal and Trautmann, Heike}},
  booktitle    = {{Parallel Problem Solving from {Nature} (PPSN XVI)}},
  isbn         = {{978-3-030-58111-4}},
  keywords     = {{Automated algorithm selection, Deep learning, Feature-based approaches, Traveling Salesperson Problem}},
  pages        = {{48–64}},
  publisher    = {{Springer-Verlag}},
  title        = {{{Deep Learning as a Competitive Feature-Free Approach for Automated Algorithm Selection on the Traveling Salesperson Problem}}},
  doi          = {{10.1007/978-3-030-58112-1_4}},
  year         = {{2020}},
}

@article{50175,
  abstract     = {{<jats:title>Abstract</jats:title>
               <jats:p>Astrophysical topics can be treated with the methods of different areas of physics, mathematics and other natural sciences. The integration of these topics into such areas could improve students’ motivation and strengthen the connections between different fields of the mentioned sciences. In this article, an example of the connection between the physics of the stars and that of their statistical distributions is given. The usage of Microsoft Excel simplifies the mathematical requirements and gives the possibility of seeing the changes of distribution with the growing age of the regarded population of stars. The changes are a direct consequence to the limited lifetime of the stars and the limited age of the considered population of stars.</jats:p>}},
  author       = {{Hohmann, Sascha}},
  issn         = {{0143-0807}},
  journal      = {{European Journal of Physics}},
  keywords     = {{General Physics and Astronomy}},
  number       = {{1}},
  publisher    = {{IOP Publishing}},
  title        = {{{Calculating the distributions of number, mass and luminosity of the stars with the help of MS Excel}}},
  doi          = {{10.1088/1361-6404/abb297}},
  volume       = {{42}},
  year         = {{2020}},
}

@article{53415,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Given a closed orientable hyperbolic manifold of dimension <jats:inline-formula><jats:alternatives><jats:tex-math>$$\ne 3$$</jats:tex-math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML">
                  <mml:mrow>
                    <mml:mo>≠</mml:mo>
                    <mml:mn>3</mml:mn>
                  </mml:mrow>
                </mml:math></jats:alternatives></jats:inline-formula> we prove that the multiplicity of the Pollicott-Ruelle resonance of the geodesic flow on perpendicular one-forms at zero agrees with the first Betti number of the manifold. Additionally, we prove that this equality is stable under small perturbations of the Riemannian metric and simultaneous small perturbations of the geodesic vector field within the class of contact vector fields. For more general perturbations we get bounds on the multiplicity of the resonance zero on all one-forms in terms of the first and zeroth Betti numbers. Furthermore, we identify for hyperbolic manifolds further resonance spaces whose multiplicities are given by higher Betti numbers.
</jats:p>}},
  author       = {{Küster, Benjamin and Weich, Tobias}},
  issn         = {{0010-3616}},
  journal      = {{Communications in Mathematical Physics}},
  keywords     = {{Mathematical Physics, Statistical and Nonlinear Physics}},
  number       = {{2}},
  pages        = {{917--941}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Pollicott-Ruelle Resonant States and Betti Numbers}}},
  doi          = {{10.1007/s00220-020-03793-2}},
  volume       = {{378}},
  year         = {{2020}},
}

@article{35869,
  author       = {{Keum, Changmin and Becker, David and Archer, Emily and Bock, Harald and Kitzerow, Heinz-Siegfried and Gather, Malte C. and Murawski, Caroline}},
  issn         = {{2195-1071}},
  journal      = {{Advanced Optical Materials}},
  keywords     = {{Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials}},
  number       = {{17}},
  publisher    = {{Wiley}},
  title        = {{{Organic Light‐Emitting Diodes Based on a Columnar Liquid‐Crystalline Perylene Emitter}}},
  doi          = {{10.1002/adom.202000414}},
  volume       = {{8}},
  year         = {{2020}},
}

@article{35859,
  author       = {{Risse, Anna Margareta and Schmidtke, Jürgen and Kitzerow, Heinz-Siegfried}},
  issn         = {{0267-8292}},
  journal      = {{Liquid Crystals}},
  keywords     = {{Condensed Matter Physics, General Materials Science, General Chemistry}},
  number       = {{7}},
  pages        = {{1025--1033}},
  publisher    = {{Informa UK Limited}},
  title        = {{{Dynamics of a liquid crystal-based modulator with germanium substrates for mid-infrared radiation}}},
  doi          = {{10.1080/02678292.2020.1839803}},
  volume       = {{48}},
  year         = {{2020}},
}

@article{40577,
  author       = {{Tian, Zhihong and Lopez Salas, Nieves and Liu, Chuntai and Liu, Tianxi and Antonietti, Markus}},
  issn         = {{2198-3844}},
  journal      = {{Advanced Science}},
  keywords     = {{General Physics and Astronomy, General Engineering, Biochemistry, Genetics and Molecular Biology (miscellaneous), General Materials Science, General Chemical Engineering, Medicine (miscellaneous)}},
  number       = {{24}},
  publisher    = {{Wiley}},
  title        = {{{C            <sub>2</sub>            N: A Class of Covalent Frameworks with Unique Properties}}},
  doi          = {{10.1002/advs.202001767}},
  volume       = {{7}},
  year         = {{2020}},
}

@article{41023,
  abstract     = {{<jats:title>Abstract</jats:title><jats:p>Efficient oxygen evolution reaction (OER) electrocatalysts are pivotal for sustainable fuel production, where the Ni-Fe oxyhydroxide (OOH) is among the most active catalysts for alkaline OER. Electrolyte alkali metal cations have been shown to modify the activity and reaction intermediates, however, the exact mechanism is at question due to unexplained deviations from the cation size trend. Our X-ray absorption spectroelectrochemical results show that bigger cations shift the Ni<jats:sup>2+/(3+δ)+</jats:sup> redox peak and OER activity to lower potentials (however, with typical discrepancies), following the order CsOH &gt; NaOH ≈ KOH &gt; RbOH &gt; LiOH. Here, we find that the OER activity follows the variations in electrolyte pH rather than a specific cation, which accounts for differences both in basicity of the alkali hydroxides and other contributing anomalies. Our density functional theory-derived reactivity descriptors confirm that cations impose negligible effect on the Lewis acidity of Ni, Fe, and O lattice sites, thus strengthening the conclusions of an indirect pH effect.</jats:p>}},
  author       = {{Görlin, Mikaela and Halldin Stenlid, Joakim and Koroidov, Sergey and Wang, Hsin-Yi and Börner, Mia and Shipilin, Mikhail and Kalinko, Aleksandr and Murzin, Vadim and Safonova, Olga V. and Nachtegaal, Maarten and Uheida, Abdusalam and Dutta, Joydeep and Bauer, Matthias and Nilsson, Anders and Diaz-Morales, Oscar}},
  issn         = {{2041-1723}},
  journal      = {{Nature Communications}},
  keywords     = {{General Physics and Astronomy, General Biochemistry, Genetics and Molecular Biology, General Chemistry, Multidisciplinary}},
  number       = {{1}},
  publisher    = {{Springer Science and Business Media LLC}},
  title        = {{{Key activity descriptors of nickel-iron oxygen evolution electrocatalysts in the presence of alkali metal cations}}},
  doi          = {{10.1038/s41467-020-19729-2}},
  volume       = {{11}},
  year         = {{2020}},
}

@article{41024,
  author       = {{Gujt, Jure and Zimmer, Peter and Zysk, Frederik and Süß, Vicky and Felser, Claudia and Bauer, Matthias and Kühne, Thomas}},
  issn         = {{2329-7778}},
  journal      = {{Structural Dynamics}},
  keywords     = {{Spectroscopy, Condensed Matter Physics, Instrumentation, Radiation}},
  number       = {{3}},
  publisher    = {{AIP Publishing}},
  title        = {{{Water structure near the surface of Weyl semimetals as catalysts in photocatalytic proton reduction}}},
  doi          = {{10.1063/4.0000008}},
  volume       = {{7}},
  year         = {{2020}},
}

@article{40217,
  author       = {{Wagenknecht, Inga and Meier-Gräwe, Uta}},
  issn         = {{2196-8225}},
  journal      = {{Praxis der Kinderpsychologie und Kinderpsychiatrie}},
  keywords     = {{Electrical and Electronic Engineering, Atomic and Molecular Physics, and Optics}},
  number       = {{7}},
  pages        = {{643--665}},
  publisher    = {{Vandenhoeck & Ruprecht GmbH & Co, KG}},
  title        = {{{Psychische Auffälligkeiten bei Kindern und Jugendlichen, für die das Jugendamt in Anspruch genommen wurde}}},
  doi          = {{10.13109/prkk.2020.69.7.643}},
  volume       = {{69}},
  year         = {{2020}},
}