@article{BhattacharyyaChattopadhyayBanerjeeetal.2018, author = {Bhattacharyya, Suvanjan and Chattopadhyay, Himadri and Banerjee, Arnab and Benim, Ali Cemal}, title = {Heat transfer and flow field in a circular twisted channel}, series = {MATEC Web of Conferences}, volume = {240}, journal = {MATEC Web of Conferences}, publisher = {edp sciences}, doi = {10.1051/matecconf/201824001005}, year = {2018}, language = {en} } @article{YalcınkayaDurmazTepeetal.2024, author = {Yal{\c{c}}{\i}nkaya, Orhan and Durmaz, Ufuk and Tepe, Ahmet {\"U}mit and Benim, Ali Cemal and Uysal, {\"U}nal}, title = {Heat and Flow Characteristics of Aerofoil-Shaped Fins on a Curved Target Surface in a Confined Channel for an Impinging Jet Array}, series = {Energies}, volume = {17}, journal = {Energies}, number = {5}, publisher = {MDPI}, issn = {1996-1073}, doi = {10.3390/en17051238}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-46387}, pages = {21}, year = {2024}, abstract = {The main purpose of this investigation was to explore the heat transfer and flow characteristics of aero-foil-shaped fins combined with extended jet holes, specifically focusing on their feasibility in cooling turbine blades. In this study, a comprehensive investigation was carried out by applying impinging jet array cooling (IJAC) on a semi-circular curved surface, which was roughened using aerofoil-shaped fins. Numerical computations were conducted under three different Reynolds numbers (Re) ranging from 5000 to 25,000, while nozzle-to-target surface spacings (S/d) ranged from 0.5 to 8.0. Furthermore, an assessment was made of the impact of different fin arrangements, single-row (L1), double-row (L2), and triple-row (L3), on convective heat transfer. Detailed examinations were performed on area-averaged and local Nusselt (Nu) numbers, flow properties, and the thermal performance criterion (TPC) on finned and smooth target surfaces. The study's results revealed that the use of aerofoil-shaped fins and the reduction in S/d, along with surface roughening, led to significant increases in the local and area-averaged Nu numbers compared to the conventional IJAC scheme. The most notable heat transfer enhancement was observed at S/d = 0.5 utilizing extended jets and the surface design incorporating aerofoil-shaped fins. Under these specific conditions, the maximum heat transfer enhancement reached 52.81\%. Moreover, the investigation also demonstrated that the highest TPC on the finned surface was achieved when S/d = 2.0 for L2 at Re = 25,000, resulting in a TPC value of 1.12. Furthermore, reducing S/d and mounting aerofoil-shaped fins on the surface yielded a more uniform heat transfer distribution on the relevant surface than IJAC with a smooth surface, ensuring a relatively more uniform heat transfer distribution to minimize the risk of localized overheating.}, subject = {Beschaufelung}, language = {en} } @incollection{Bleck2026, author = {Bleck, Christian}, title = {Healthy (Health-Equitable) Cities: Approaches to Participation and Inclusion in the Neighborhood}, series = {Chronic Care - Science and Practice}, booktitle = {Chronic Care - Science and Practice}, editor = {Schmitz, Daniela and Fiedler, Manfred and Becker, Heike and Habetur, Simone and Ortloff, Jan-Hendrik}, publisher = {Springer Nature}, address = {Berlin, Heidelberg}, isbn = {9783662722978}, doi = {10.1007/978-3-662-72298-5_50}, pages = {403 -- 413}, year = {2026}, subject = {Gesundheitsf{\"o}rderung}, language = {en} } @inproceedings{HerderNeiderKinuwaki2007, author = {Herder, Jens and Neider, Christian and Kinuwaki, Shinichi}, title = {HDR-based lighting estimation for virtual studio (TV) environments}, series = {10th International Conference on Human and Computer}, booktitle = {10th International Conference on Human and Computer}, address = {D{\"u}sseldorf, Aizu-Wakamatsu}, doi = {10.20385/opus4-1666}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-16665}, pages = {111 -- 117}, year = {2007}, abstract = {Two high dynamic range HDR environments maps based on video streams from fish-eye lens cameras are used for generating virtual lights in a virtual set renderer. The task of realistic virtual light setup of scenes using captured environment maps might be eased as well as visual quality improves. We discuss the light setting problem for virtual studio tv productions which have mixed scenes of real objects, actors, virtual objects and virtual backgrounds. Benefits of hdr interactive light control are that the real light in the studio does not have to be remodeled and the artistic impression by using the light in the studio is also captured. An analysis of system requirements identifies technical challenges. We discuss the properties of a prototype system including test production.}, language = {en} } @article{CarapezzaBarberiRanaldietal.2012, author = {Carapezza, M. L. and Barberi, F. and Ranaldi, M. and Ricci, T. and Tarchini, L. and Barrancos, Jos{\´e} and Fischer, C. and Granieri, D. and Lucchetti, C. and Melian, G. and Perez, N. and Tuccimei, P. and Vogel, A. and Weber, Konradin}, title = {Hazardous gas emissions from the flanks of the quiescent Colli Albani volcano (Rome, Italy)}, series = {Applied Geochemistry}, volume = {27}, journal = {Applied Geochemistry}, number = {9}, publisher = {Elsevier}, doi = {10.1016/j.apgeochem.2012.02.012}, pages = {1767 -- 1782}, year = {2012}, language = {en} } @article{Virchow2025, author = {Virchow, Fabian}, title = {Hass-Rede-Freiheit - Medienhandeln der populistischen und extremen Rechten}, series = {Forschungsjournal Soziale Bewegungen}, volume = {38}, journal = {Forschungsjournal Soziale Bewegungen}, number = {1}, publisher = {De Gruyter}, address = {Berlin, Boston}, issn = {2365-9890}, doi = {10.1515/fjsb-2025-2007}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-50575}, pages = {55 -- 69}, year = {2025}, abstract = {Zunehmend werden Medien der extremen und populistischen Rechten als ‚Alternativmedien' bezeichnet; dieses politische Lager zielt unter dem Banner des Eintretens f{\"u}r die Meinungsfreiheit auf eine Ausweitung des Sagbaren (z. B. Rassismus, Antisemitismus) und zugleich eine Einschr{\"a}nkung liberaler und demokratischer Positionen. Ein breites Spektrum an Strategien und kommunikative Arsenalen sowie die mit der AfD verf{\"u}gbaren Ressourcen erlauben eine erhebliche Ausweitung der Reichweite.}, subject = {Rechtsradikalismus}, language = {en} } @techreport{BhaiyaJahrHappel2007, author = {Bhaiya, Madhur and Jahr, Andreas and Happel, Holger}, title = {Harvesting-Combine-Flow Simulation Technique}, address = {D{\"u}sseldorf}, organization = {Autorenkollektiv}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-4239}, year = {2007}, abstract = {CFX 11.0 is a Computational Fluid Dynamics (CFD) program for simulating the behavior of systems involving fluid flow, heat transfer, and other related physical processes. It works by solving the equations of fluid flow (in a special form) over a region of interest, with specified (known) conditions on the boundary of that region. This tool is used here to analyse the straw cutter which is used to comminute the straw which is left standing in the field after stripper header has stripped the grains from the crops. Stripper Header is a new technique different to conventional harvester machines and it is still under development and testing. It works on the principle in which grains are first stripped off from the head of the standing crop which helps in much reduced intake freeing up the separation systems to handle a larger volume of grains. But with this, the new problem of the disposal of the long, uncut straw left after stripping of grains arose. So a straw cutter is used after the stripper header stage in this Combine Harvester, where the rotor is equipped with pressed steel blades and rotates towards the crop, i.e., it cuts and lifts the straw over the top. This technique is environment friendly because previously farmers would have to burn the long, uncut straw standing in the fields while in this case mulched straw can be used for min-till systems. This rotor based straw cutting machine is analysed here which helps us in increasing power efficiency and comminution rate and quality of cut straw particles. Here fluid flow simulation has been preferred over particle simulation: - CFX 10.0 tool is not very effective for particle simulation techniques and computation time is increased considerably. - It's very hard to realize particle simulation in CFX 10.0 because we have to define size and properties of each particle and besides this wall conditions would have to be defined differently for every boundary. - Besides this, it's hard to realize cutting effect with straw particles in CFX 10.0 which otherwise would be comminuted in real life conditions. - The results obtained from fluid simulation are validated using experimental results and found to be nearly the same which clearly contradicts any need of performing particle simulation.}, language = {en} } @inproceedings{ReichPatrickAdam2024, author = {Reich, Marius and Patrick, Rathjen and Adam, Mario}, title = {Harnessing Machine Learning for Rapid Optimization: Integration of Time Series Data into Prior Approximation of Energy System Simulations}, series = {Book of Abstracts :10th International Conference on Smart Energy Systems}, booktitle = {Book of Abstracts :10th International Conference on Smart Energy Systems}, editor = {Lund, Henrik and Mathiesen, Brian Vad and {\O}stergaard, Poul Alberg and Thellufsen, Jakob Zinck and Brodersen, Hans J{\o}rgen}, publisher = {Aalborg University}, address = {Aalborg}, pages = {73}, year = {2024}, language = {en} } @book{Huber2024, author = {Huber, Florian}, title = {Hands-on Introduction to Data Science with Python}, edition = {v0.21}, publisher = {Zenodo}, doi = {10.5281/zenodo.10074474}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-49548}, pages = {365}, year = {2024}, abstract = {In today's world, data is generated at an unprecedented pace, and our ability to harness it is changing the way we live, work, and even think. Data science, the interdisciplinary field that blends statistics, computer science, and domain-specific knowledge, empowers us to extract insights from this vast ocean of data. As data science becomes increasingly essential across various industries and sectors, there is a growing need for skilled professionals who can make sense of data and transform it into actionable information. This book is designed to give you a very broad and at the same time a very practical hands-on tour through the full spectrum of data science approaches}, subject = {Data Science}, language = {en} } @incollection{VoigtMairUnterfrauner2018, author = {Voigt, Christian and Mair, Sebastian and Unterfrauner, Elisabeth}, title = {Hacking the Knowledge of Maker Communities in Support of 21st Century Education}, series = {Internet Science}, volume = {Lecture Notes in Computer Science: 11193}, booktitle = {Internet Science}, editor = {Bodrunova, Svetlana S.}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {978-3-030-01436-0}, doi = {10.1007/978-3-030-01437-7_22}, pages = {286 -- 299}, year = {2018}, language = {en} } @article{FischerFassbach2024, author = {Fischer, Peter C. and Fassbach, Burkhard}, title = {Guest Post: The German D\&O Procurement Clause Revisited}, series = {The D\&O Diary: A Periodic Journal Containing Items of Interest From the World of Directors \& Officers Liability, With Occasional Commentary}, journal = {The D\&O Diary: A Periodic Journal Containing Items of Interest From the World of Directors \& Officers Liability, With Occasional Commentary}, year = {2024}, subject = {Organhaftung}, language = {en} } @article{GroteKastsianMoennigmann2013, author = {Grote, Wolfgang and Kastsian, Darya and M{\"o}nnigmann, Martin}, title = {Guaranteed stability in optimal power generation dispatching under uncertainty}, series = {IEEE Transactions on Power Systems}, volume = {28}, journal = {IEEE Transactions on Power Systems}, number = {2}, publisher = {IEEE}, issn = {1558-0679}, doi = {10.1109/TPWRS.2012.2207970}, pages = {1103 -- 1112}, year = {2013}, abstract = {Stability and cost optimality of power generation and supply systems must not be considered independently from one another. Simple examples show that optimizing cost without considering stability may result in modes of operation that, while economically optimal, are unstable. We demonstrate that stability, robustness, and optimality can be considered systematically and simultaneously by combining bifurcation theory and nonlinear optimization. Essentially, the proposed method enforces a backoff distance between the optimal point of operation and operational or stability boundaries in the space of the optimization variables, where bifurcation theory is used to describe nonlinear stability boundaries.}, language = {en} } @article{HuberKaesStuhrmann2008, author = {Huber, Florian and K{\"a}s, Josef and Stuhrmann, Bj{\"o}rn}, title = {Growing actin networks form lamellipodium and lamellum by self-assembly}, series = {Biophysical Journal}, volume = {95}, journal = {Biophysical Journal}, number = {12}, publisher = {Biophysical Society}, issn = {1542-0086}, doi = {10.1529/biophysj.108.134817}, pages = {5508 -- 5523}, year = {2008}, abstract = {Many different cell types are able to migrate by formation of a thin actin-based cytoskeletal extension. Recently, it became evident that this extension consists of two distinct substructures, designated lamellipodium and lamellum, which differ significantly in their kinetic and kinematic properties as well as their biochemical composition. We developed a stochastic two-dimensional computer simulation that includes chemical reaction kinetics, G-actin diffusion, and filament transport to investigate the formation of growing actin networks in migrating cells. Model parameters were chosen based on experimental data or theoretical considerations. In this work, we demonstrate the system's ability to form two distinct networks by self-organization. We found a characteristic transition in mean filament length as well as a distinct maximum in depolymerization flux, both within the first 1-2 microm. The separation into two distinct substructures was found to be extremely robust with respect to initial conditions and variation of model parameters. We quantitatively investigated the complex interplay between ADF/cofilin and tropomyosin and propose a plausible mechanism that leads to spatial separation of, respectively, ADF/cofilin- or tropomyosin-dominated compartments. Tropomyosin was found to play an important role in stabilizing the lamellar actin network. Furthermore, the influence of filament severing and annealing on the network properties is explored, and simulation data are compared to existing experimental data.}, language = {en} } @inproceedings{GalleArellanoCondeetal.2015, author = {Galle, Bo and Arellano, Santiago and Conde, Vladimir and Pfeffer, Melissa and Barsotti, Sara and Stefansdottir, Gerður and Bergsson, Baldur and Bergsson, Bergur and Ingvarsson, Thorgils and Weber, Konradin}, title = {Ground based measurements of the gas emission from the Holuhraun volcanic fissure eruption on Iceland 2014/2015}, series = {Geophysical Research Abstracts: EGU General Assembly 2015}, volume = {17}, booktitle = {Geophysical Research Abstracts: EGU General Assembly 2015}, publisher = {Copernicus}, address = {G{\"o}ttingen}, year = {2015}, abstract = {The since 31 August 2014 ongoing volcanic eruption at Holuhraun on Iceland is by far the strongest source of sulfur dioxide in Europe over the last 230 years with sustained emission rates exceeding 100 000 ton/day. This gas emission severely affects local population and has become a concern also for air traffic. The eruption has in December continued at constant pace for 3.5 months. Three scenarios are envisaged for the future; (1) the eruption stops, (2) the fissure extends under the Vattnaj{\"o}kul glacier and (3) Bardarbunga volcano erupts. The two later scenarios will cause increased gas emission, severe ash emissions and extended flooding. Under the scope of the EU-project FUTUREVOLC, a project with 3.5 years duration, aiming at making Iceland a supersite for volcanological research as a European contribution to GEO, we are developing a version of the Scanning DOAS instrument that is adapted to high latitudes with low UV radiation and severe meteorological conditions. Since the first day of the eruption several of these novel instruments has been monitoring the SO2 emission from the eruption. Data from our instruments are still after 3.5 months the only sustained ground-based monitoring of this gas emission. A lot of work is however needed to sustain this operation at a very remote site and under severe field conditions. At the same time the very high concentrations in the gas plume, in combination with bad meteorological conditions require the development of novel methods to derive reliable flux estimates. In this presentation we will discuss the instrumental issues and present the latest version of the emission estimates made from our measurements.}, subject = {Vulkanismus}, language = {en} } @techreport{NiemannBruckmannKrautzer2020, author = {Niemann, J{\"o}rg and Bruckmann, Julian and Krautzer, Florian}, title = {Green City Deals: A study on the global warming potential of alternative urban transportation systems}, address = {D{\"u}sseldorf}, organization = {Hochschule D{\"u}sseldorf}, doi = {10.20385/kd43-fz18}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-28972}, pages = {14}, year = {2020}, abstract = {The population is growing constantly in urban areas. This results in an increasing demand for mobility solutions while it is also worldwide aimed to reduce greenhouse gas emissions. This paper summarizes the results of a comparative study concerning the greenhouse gas emissions (based on carbon footprint) caused by alternative urban passenger transportation systems. The emissions for the vehicles and their infrastructure are analyszed over the entire life cycle from manufacturing up to their end of life. An existing cable car sytem in La Paz, Bolivia was analysed and evaluated in comparison to other modes of transportation such as small busses, large busses and a tram. According to the system definitions and the considered balance framework the study shows that beside the use of the systems the materials and the manufacturing as well as the infrastructure have a significant impact on the total emissions over the life cycle. To put focus on the „true and real" impacts to the society it is preferable to consider the measurement results in total absolute emissions.}, language = {en} } @inproceedings{JanduraWeinmann2023, author = {Jandura, Olaf and Weinmann, Carina}, title = {Greater Confusion in the Voter Market in Germany: Differences Between Subjective and Value-Based Categorization on the Left-Right Axis}, series = {Jahrestagung der DGPuK-Fachgruppe Rezeptions- und Wirkungsforschung 2022: Tagungsband}, booktitle = {Jahrestagung der DGPuK-Fachgruppe Rezeptions- und Wirkungsforschung 2022: Tagungsband}, editor = {Ziegele, Marc and K{\"u}mpel, Anna Sophie and Dienlin, Tobias}, publisher = {SSOAR}, address = {D{\"u}sseldorf}, doi = {10.21241/ssoar.96575}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-56419}, pages = {75 -- 92}, year = {2023}, abstract = {In den letzten Jahren war h{\"a}ufig von einem Rechtsruck in der Gesellschaft die Rede (O. Decker et al., 2016). Bev{\"o}lkerungsrepr{\"a}sentative Umfragedaten belegen diese These jedoch nicht. Weder die Allgemeine Bev{\"o}lkerungsumfrage der Sozialwissenschaften (ALLBUS) noch der European Social Survey zeigen f{\"u}r die letzten Jahrzehnte signifikante Ver{\"a}nderungen in der Selbstpositionierung der Befragten auf der Links-Rechts-Skala. Dies wirft die Frage auf, ob es sich bei dem behaupteten gesellschaftlichen Rechtsruck um ein soziologisches Wahrnehmungsph{\"a}nomen handelt, das durch die intensive {\"o}ffentliche Debatte verst{\"a}rkt wird, oder ob Zweifel an der Validit{\"a}t der politischen Selbstpositionierung auf der Links-Rechts-Skala angebracht sind. Der vorliegende Artikel befasst sich mit der letzteren Frage. Unsere Analysen ergaben, dass bei 31 \% der Befragten in unserer Stichprobe eine Divergenz zwischen der subjektiven Positionierung auf der Links-Rechts-Skala und einer wertbezogenen Positionierung besteht. Wir er{\"o}rtern, welche Variablen diese Divergenz erkl{\"a}ren k{\"o}nnen und welche Konsequenzen daraus f{\"u}r die kommunikationswissenschaftliche Forschung gezogen werden k{\"o}nnen.}, subject = {Politische Einstellung}, language = {en} } @article{ShajahanBenim2026, author = {Shajahan, Mohamed Iqbal and Benim, Ali Cemal}, title = {Granular PCM based heat sink for electronics thermal management}, series = {Applied Thermal Engineering}, volume = {286}, journal = {Applied Thermal Engineering}, publisher = {Elsevier}, issn = {1359-4311}, doi = {10.1016/j.applthermaleng.2025.129336}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-59649}, year = {2026}, abstract = {This study investigates aluminum heat sinks integrated with GR42 phase change material (PCM), aiming to enhance thermal inertia and stabilize device temperatures. This is important, since the increasing miniaturization and performance demands for electronic devices have led in a growing need for advanced thermal management systems capable of handling rapid transient loads. The novelty of the work lies in examining different heat sink layouts that optimize the heat dissipation capabilities of GR42 PCMs while minimizing size and weight for electronic cooling. The experimental testing was conducted using three configurations, namely no fin, circular fin and hexagonal fin, with three input powers (4 W, 8 W, and 12 W). The experimental results show that the hexagonal-fin heat sink, surface area is 25 \% more than circular fins, exhibited superior thermal performance without significant variation in input power. Notably, the hexagonal-fin heat sink achieved the desired set point temperature of 55 ◦C in 33 \% less time than the circular-fin design and 45 \% less time than the heat sink without fins. Furthermore, the peak temperatures increased up to 21 \% for circular fins. During the charging cycles, the enhancement ratios vary from 72 \% and begin to narrow to 25 \% during discharge cycles. The hexagonal-fin configuration also exhibited superior melting dynamics, completing the phase transition 44 \% faster at higher input power than the circular fins, and established a thermal deviation of nearly 51 \% less than finless heat sinks. These findings underscore the critical role of fin geometry and PCM integration in achieving uniform temperature distribution and improved energy storage efficiency. Overall, the hexagonal-fin heat sink with GR42 PCM shows strong potential as a passive cooling solution for low-power portable electronic devices.}, language = {en} } @unpublished{YuwonoLoeppenbergSchwungetal.2024, author = {Yuwono, Steve and L{\"o}ppenberg, Marlon and Schwung, Dorothea and Schwung, Andreas}, title = {Gradient-based Learning in State-based Potential Games for Self-Learning Production Systems}, series = {arxiv}, journal = {arxiv}, publisher = {arxiv}, doi = {10.48550/arXiv.2406.10015}, year = {2024}, abstract = {In this paper, we introduce novel gradient-based optimization methods for state-based potential games (SbPGs) within self-learning distributed production systems. SbPGs are recognised for their efficacy in enabling self-optimizing distributed multi-agent systems and offer a proven convergence guarantee, which facilitates collaborative player efforts towards global objectives. Our study strives to replace conventional ad-hoc random exploration-based learning in SbPGs with contemporary gradient-based approaches, which aim for faster convergence and smoother exploration dynamics, thereby shortening training duration while upholding the efficacy of SbPGs. Moreover, we propose three distinct variants for estimating the objective function of gradient-based learning, each developed to suit the unique characteristics of the systems under consideration. To validate our methodology, we apply it to a laboratory testbed, namely Bulk Good Laboratory Plant, which represents a smart and flexible distributed multi-agent production system. The incorporation of gradient-based learning in SbPGs reduces training times and achieves more optimal policies than its baseline.}, subject = {Maschinelles Lernen}, language = {en} } @inproceedings{BeckerLippelZielke2019, author = {Becker, Martin and Lippel, Jens and Zielke, Thomas}, title = {Gradient Descent Analysis: On Visualizing the Training of Deep Neural Networks}, series = {VISIGRAPP 2019: Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications : Prague, Czech Republic, February 25-27, 2019}, volume = {Volume: 3}, booktitle = {VISIGRAPP 2019: Proceedings of the 14th International Joint Conference on Computer Vision, Imaging and Computer Graphics Theory and Applications : Prague, Czech Republic, February 25-27, 2019}, publisher = {INSTICC}, isbn = {978-989-758-354-4}, doi = {10.5220/0007583403380345}, pages = {338 -- 345}, year = {2019}, language = {en} } @techreport{Deckert2024, author = {Deckert, Carsten}, title = {Good Vibrations from Electronic Circuits: The Technological Development of the Synthesizer}, issn = {2941-4075}, doi = {10.20385/opus4-4439}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-44394}, pages = {28}, year = {2024}, language = {en} } @article{deJongeMildauMeijeretal.2022, author = {de Jonge, Niek F. and Mildau, Kevin and Meijer, David and Louwen, Joris J. R. and Bueschl, Christoph and Huber, Florian and van der Hooft, Justin J. J.}, title = {Good practices and recommendations for using and benchmarking computational metabolomics metabolite annotation tools}, series = {Metabolomics}, volume = {18}, journal = {Metabolomics}, number = {12}, publisher = {Springer Nature}, issn = {1573-3890}, doi = {10.1007/s11306-022-01963-y}, pages = {22}, year = {2022}, abstract = {Background Untargeted metabolomics approaches based on mass spectrometry obtain comprehensive profiles of complex biological samples. However, on average only 10\% of the molecules can be annotated. This low annotation rate hampers biochemical interpretation and effective comparison of metabolomics studies. Furthermore, de novo structural characterization of mass spectral data remains a complicated and time-intensive process. Recently, the field of computational metabolomics has gained traction and novel methods have started to enable large-scale and reliable metabolite annotation. Molecular networking and machine learning-based in-silico annotation tools have been shown to greatly assist metabolite characterization in diverse fields such as clinical metabolomics and natural product discovery. Aim of review We highlight recent advances in computational metabolite annotation workflows with a special focus on their evaluation and comparison with other tools. Whilst the progress is substantial and promising, we also argue that inconsistencies in benchmarking different tools hamper users from selecting the most appropriate and promising method for their research. We summarize benchmarking strategies of the different tools and outline several recommendations for benchmarking and comparing novel tools. Key scientific concepts of review This review focuses on recent advances in mass spectral library-based and machine learning-supported metabolite annotation workflows. We discuss large-scale library matching and analogue search, the current bloom of mass spectral similarity scores, and how molecular networking has changed the field. In addition, the potentials and challenges of machine learning-supported metabolite annotation workflows are highlighted. Overall, recent developments in computational metabolomics have started to fundamentally change metabolomics workflows, and we expect that as a community we will be able to overcome current method performance ambiguities and annotation bottlenecks.}, subject = {Metabolomik}, language = {en} } @inproceedings{GeigerThieleMeyeretal.2013, author = {Geiger, Christian and Thiele, Simon and Meyer, Laurid and Meyer, Stefan and H{\"o}ren, Lutz and Drochtert, Daniel}, title = {Goin' Goblins - Iterative Design of an Entertaining Archery Experience}, series = {Advances in Computer Entertainment. 10th International Conference, ACE 2013, Boekelo, The Netherlands, November 12-15, 2013. Proceedings}, volume = {8253}, booktitle = {Advances in Computer Entertainment. 10th International Conference, ACE 2013, Boekelo, The Netherlands, November 12-15, 2013. Proceedings}, editor = {Reidsma, Dennis and Katayose, Haruhiro and Nijholt, Anton}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {978-3-319-03160-6}, doi = {10.1007/978-3-319-03161-3_20}, pages = {284 -- 295}, year = {2013}, language = {en} } @incollection{Virchow2019, author = {Virchow, Fabian}, title = {Globalization, Crisis, and Right-Wing Populism in Context}, series = {Stifled Progress - International Perspectives on Social Work and Social Policy in the Era of Right-Wing Populism}, booktitle = {Stifled Progress - International Perspectives on Social Work and Social Policy in the Era of Right-Wing Populism}, editor = {Fischer, J{\"o}rg and Dunn, Kerry}, publisher = {Verlag Barbara Budrich}, address = {Opladen}, isbn = {9783847413233}, pages = {59 -- 70}, year = {2019}, language = {en} } @article{MiguelesRowlandsHuberetal.2019, author = {Migueles, Jairo H. and Rowlands, Alex V. and Huber, Florian and Sabia, S{\´e}verine and van Hees, Vincent T.}, title = {GGIR: A Research Community-Driven Open Source R Package for Generating Physical Activity and Sleep Outcomes From Multi-Day Raw Accelerometer Data}, series = {Journal for the Measurement of Physical Behaviour}, volume = {2}, journal = {Journal for the Measurement of Physical Behaviour}, number = {3}, publisher = {Human Kinetics}, issn = {2575-6605}, doi = {10.1123/jmpb.2018-0063}, pages = {188 -- 196}, year = {2019}, language = {en} } @incollection{Virchow2023, author = {Virchow, Fabian}, title = {Germany}, series = {Routledge Handbook of Violent Extremism and Resilience}, booktitle = {Routledge Handbook of Violent Extremism and Resilience}, edition = {1}, publisher = {Routledge}, address = {London}, isbn = {9781003267102}, doi = {10.4324/9781003267102-13}, pages = {168 -- 180}, year = {2023}, subject = {Rechtsradikalismus}, language = {en} } @article{TitusKaluzaMarschall2014, author = {Titus, Juliane and Kaluza, Stefan and Marschall, Roland}, title = {German Catalysis on an International Scale in Weimar}, series = {ChemCatChem}, volume = {6}, journal = {ChemCatChem}, number = {6}, publisher = {Wiley}, issn = {1867-3899}, doi = {10.1002/cctc.201402266}, pages = {1523 -- 1525}, year = {2014}, language = {en} } @article{EngelKaluzaOezaslanetal.2017, author = {Engel, Rebecca V. and Kaluza, Stefan and Oezaslan, Mehtap and Peitz, Stephan}, title = {German Catalysis Meeting - 50 Years and as Young as Ever}, series = {ChemCatChem}, volume = {9}, journal = {ChemCatChem}, number = {11}, publisher = {Wiley}, issn = {1867-3899}, doi = {10.1002/cctc.201700683}, pages = {2018 -- 2020}, year = {2017}, language = {en} } @inproceedings{Jendreiko2024, author = {Jendreiko, Christian}, title = {Generative Logic: Teaching Prolog as Generative AI in Art and Design}, series = {ICLP-WS 2024 ICLP Workshops 2024: Workshop Proceedings of the 40th International Conference on Logic Programming (ICLP-WS 2024) co-located with the 40th International Conference on Logic Programming (ICLP 2024)}, volume = {3799}, booktitle = {ICLP-WS 2024 ICLP Workshops 2024: Workshop Proceedings of the 40th International Conference on Logic Programming (ICLP-WS 2024) co-located with the 40th International Conference on Logic Programming (ICLP 2024)}, editor = {Arias, Joaqu{\´i}n and Azzolini, Damiano and Basu, Kinjal and Dahl, Veronica and Hecher, Markus and Pacenza, Francesco and Saribatur, Zeynep and Varanasi, Sarat C.}, publisher = {RWTH Aachen}, address = {Aachen}, issn = {1613-0073}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-46771}, pages = {1 -- 11}, year = {2024}, abstract = {This paper introduces a method for teaching Prolog, especially to BA and MA students in art and design faculties. The method is called Exploring Generative Logic (EGL). The method is based on the concept of Generative Logic. Both methods are under development at the Faculty of Design, HSD, University of Applied Sciences, D{\"u}sseldorf. The basic idea of teaching Prolog with EGL is to present Prolog not as "another" programming language, but primarily as a logic AI. This perspective helps beginners gain a clear view of how Prolog works and focuses on understanding Prolog as a powerful generative AI, making it highly attractive in the domain of art and design. The author assumes that the EGL method can be easily adapted to other educational settings: education of non-programmers of all ages, including children in elementary or secondary schools, as well as students in other non-STEM curricula, to develop skills in logical thinking, digital literacy, AI literacy, and artistic literacy. The paper is divided into two parts: Part one provides an introduction to the basic ideas and objectives of the teaching method. Part two offers a description of the teaching method.}, language = {en} } @phdthesis{Versuemer2025, author = {Vers{\"u}mer, Siegbert}, title = {Generalized prediction of quiet indoor soundscapes based on retrospective and in-situ judgements}, publisher = {Berlin}, address = {Technische Universit{\"a}t Berlin}, doi = {10.14279/depositonce-23962}, pages = {199}, year = {2025}, abstract = {This dissertation aims to enhance the understanding of how people perceive and react to everyday sounds, particularly in their homes. The focus is laid on indoor soundscapes and the interplay between acoustic measures, individual differences, and contextual factors. A retrospective online study and a field study at peoples' homes based on the Experience Sampling Method were the ecologically valid ground truth for four key publications. These address significant gaps in soundscape research by providing insights into the factors influencing sound perception in real-life contexts, the evaluation of low-level (i.e., quiet) sounds, and the consequences of (in)appropriate statistical analysis of imbalanced hierarchical soundscape data. The studies reveal that the sound source category is a critical predictor of annoyance and the pleasantness of soundscapes, with different types of sounds (e.g., natural, human, technical) having distinct impacts. Contrary, the effect of acoustic measures like perceived and calculated loudness on sound perception was expected to be high but was masked by contextual factors. These were the perceived control over the acoustic situation and the affective state of a person in the specific situation, proving context-related perceptual measures to be more important than the sound itself. The research consequently highlights the need for automatic sound source identification in complex polyphony everyday sound environments and suggests that individual preferences and liking of sounds could be potential factors in predicting individual sound perception. The dissertation also emphasizes the importance of using appropriate statistical methods, including mixed-effects models and nonlinear regression techniques, to generate more generalizable and more valid results based on hierarchical and imbalanced soundscape data. The findings underscore the limitations of traditional acoustic metrics and advocate for the use of time-series data to better capture the dynamic nature of everyday sound environments in contrast to stimuli typically used in laboratory studies. The author further developed a multi-objective function for avoiding both over- and underfitting during hyperparameter tuning, significantly improving generalized model fitting in soundscape research. Overall, this work contributes to the field of soundscape research by providing a comprehensive analysis of sound perception in indoor environments, highlighting the importance of context, individual differences, and advanced statistical methods in understanding and modeling soundscapes. Finally, future perspectives were discussed, such as the focus on individual preferences, experiences, and expectations for the improved prediction of individual sound perception.}, subject = {Psychoakustik}, language = {en} } @article{EckhardtKaletkaPelkaetal.2021, author = {Eckhardt, Jennifer and Kaletka, Christoph and Pelka, Bastian and Unterfrauner, Elisabeth and Voigt, Christian and Zirngiebl, Marthe}, title = {Gender in the making: An empirical approach to understand gender relations in the maker movement}, series = {International Journal of Human-Computer Studies}, volume = {145}, journal = {International Journal of Human-Computer Studies}, number = {102548}, publisher = {Elsevier}, issn = {1095-9300}, doi = {10.1016/j.ijhcs.2020.102548}, year = {2021}, language = {en} } @article{MoellmannHungerSchulzetal.2020, author = {M{\"o}llmann, Anne and Hunger, Antje and Schulz, Claudia and Wilhelm, Sabine and Buhlmann, Ulrike}, title = {Gazing rituals in body dysmorphic disorder}, series = {Journal of behavior therapy and experimental psychiatry}, volume = {68}, journal = {Journal of behavior therapy and experimental psychiatry}, publisher = {Elsevier}, doi = {10.1016/j.jbtep.2019.101522}, pages = {101522}, year = {2020}, language = {en} } @article{MoellmannHungerDusendetal.2019, author = {M{\"o}llmann, Anne and Hunger, Antje and Dusend, Christina and van den Hout, Marcel and Buhlmann, Ulrike}, title = {Gazing at facial features increases dissociation and decreases attractiveness ratings in non-clinical females - A potential explanation for a common ritual in body dysmorphic disorder}, series = {PloS one}, volume = {14}, journal = {PloS one}, number = {7}, publisher = {PLoS}, organization = {PLoS}, doi = {10.1371/journal.pone.0219791}, year = {2019}, abstract = {Rituals, such as gazing at faces, are common in body dysmorphic disorder (BDD) and appear in cognitive-behavioral models as a maintaining factor. Rituals are also common in obsessive-compulsive disorder (OCD). In contrast to OCD, the proposed associations between rituals and intrusive thoughts/appearance preoccupation have not been empirically investigated for BDD. We examined if the assumed effect of gazing rituals on attractiveness ratings exists and if it is associated with dissociation. In an experiment, we asked N = 65 non-clinical females to focus on the nose of a photographed face at pre- and post-test. In between, participants gazed at the nose of either the same (relevant gazing) or another face (irrelevant gazing). We found increasing dissociation after gazing in both conditions and a differentially stronger decrease of attractiveness ratings in the relevant gazing condition. Our findings support the hypothesized effect of gazing rituals on attractiveness evaluation in cognitive-behavioral models for BDD.}, language = {en} } @inproceedings{TreskunovVogelWroblewskaetal.2018, author = {Treskunov, Anastasia and Vogel, Christoph and Wr{\´o}blewska, Marta and Bertram, Michael and B{\"u}ntig, Fabian and Geiger, Christian}, title = {G:RASS - Experiencing a City Through an Artist's Eyes}, series = {Intelligent Technologies for Interactive Entertainment: INTETAIN 2017, Funchal, Portugal, June 20-22, 2017, Proceedings}, booktitle = {Intelligent Technologies for Interactive Entertainment: INTETAIN 2017, Funchal, Portugal, June 20-22, 2017, Proceedings}, editor = {Chisik, Yoram and Holopainen, Jussi and Khaled, Rilla and Luis Silva, Jos{\´e} and Alexandra Silva, Paula}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {978-3-319-73061-5}, doi = {10.1007/978-3-319-73062-2_12}, pages = {142 -- 145}, year = {2018}, language = {en} } @inproceedings{GaidaStuhlsatzMeier2008, author = {Gaida, Daniel and Stuhlsatz, Andr{\´e} and Meier, Hans-G{\"u}nter}, title = {Fusion of Visual and Inertial Measurements for Pose Estimation}, series = {Proceedings of the Workshop on Emotion-, Speech- and Face Recognition with Advanced Classifiers: D{\"u}sseldorf, Germany, May 16 - 17, 2008 ; 3rd joined research workshop between Otto-von-Guericke University Magdeburg and the University of Applied Sciences FH D{\"u}sseldorf}, booktitle = {Proceedings of the Workshop on Emotion-, Speech- and Face Recognition with Advanced Classifiers: D{\"u}sseldorf, Germany, May 16 - 17, 2008 ; 3rd joined research workshop between Otto-von-Guericke University Magdeburg and the University of Applied Sciences FH D{\"u}sseldorf}, editor = {Wendemuth, Andreas and Meier, Hans-G{\"u}nter}, publisher = {Otto-von-Guericke University Magdeburg}, address = {Magdeburg}, isbn = {9783940961242}, pages = {39 -- 48}, year = {2008}, language = {en} } @incollection{TriebusHarthDruzeticVogeletal.2025, author = {Triebus, Charlotte and Harth, Jonathan and Druzetic-Vogel, Ivana and Geiger, Christian}, title = {From Tool to Space: Towards Classifying New Media Art}, series = {Extended Reality: International Conference, XR Salento 2025, Otranto, Italy, June 17-20, 2025, Proceedings, Part V}, volume = {Lecture Notes in Computer Science, Bd.15741}, booktitle = {Extended Reality: International Conference, XR Salento 2025, Otranto, Italy, June 17-20, 2025, Proceedings, Part V}, editor = {De Paolis, Lucio Tommaso and Arpaia, Pasquale and Sacco, Marco}, publisher = {Springer Nature Switzerland}, address = {Cham}, isbn = {9783031977749}, issn = {0302-9743}, doi = {10.1007/978-3-031-97775-6_10}, pages = {171 -- 191}, year = {2025}, subject = {Medienkunst}, language = {en} } @article{VossMusallLichtmess2011, author = {Voss, Karsten and Musall, Eike and Lichtmeß, Markus}, title = {From Low Energy to Net Zero-Energy Buildings: Status and Perspectives}, series = {Journal of Green Building}, volume = {6}, journal = {Journal of Green Building}, number = {1}, publisher = {College Publishing}, doi = {10.3992/jgb.6.1.46}, pages = {46 -- 57}, year = {2011}, abstract = {"Net Zero-Energy Building" has become a popular catchphrase to describe the synergy between energy-efficient building and renewable energy utilisation to achieve a balanced energy budget over an annual cycle. Taking into account the energy exchange with a grid overcomes the limitations of energy-autonomous buildings with the need for seasonal energy storage on-site. Although the expression, "Net Zero-Energy Building," appears in many energy policy documents, a harmonised definition or a standardised balancing method is still lacking. This paper reports on the background and the various effects influencing the energy balance approach. After discussing the national energy code framework in Germany, a harmonised terminology and balancing procedure is proposed. The procedure takes not only the energy balance but also energy efficiency and load matching into account.}, language = {en} } @inproceedings{ThielenSalgertFranz2025, author = {Thielen, Sven and Salgert, Bj{\"o}rn and Franz, Thomas}, title = {From Lab to Market: Architectural Evolution in Open Source Transition}, series = {Software Architecture, 19th European Conference, ECSA 2025, Limassol, Cyprus, September 15-19, 2025, Proceedings}, volume = {LNCS 15929}, booktitle = {Software Architecture, 19th European Conference, ECSA 2025, Limassol, Cyprus, September 15-19, 2025, Proceedings}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783032021373}, issn = {0302-9743}, doi = {10.1007/978-3-032-02138-0_20}, pages = {306 -- 322}, year = {2025}, subject = {Open Source}, language = {en} } @techreport{vanRiessenvandenBrink2020, author = {van Rießen, Anne and van den Brink, Henning}, title = {From impacts to benefits: User research as a change of perspective for studies on the practice of drama education}, address = {D{\"u}sseldorf}, issn = {2509-6958}, doi = {10.20385/2509-6958/2020.6}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-21273}, pages = {17}, year = {2020}, abstract = {This essay looks at the potentials and limitations of user research for studies on the practice of drama education. To date, this field has been dominated by impact studies. After illustrating the blind spots that are created by taking this research approach to the practice of drama education, we will present the user research perspective and look at the opportunities that it provides to generate new, differentiated knowledge. User research makes it possible to illuminate the processes of acquiring and using knowledge in terms of its delivery. It also provides a potential framework of analysis for placing these processes in the delivery context, which includes subjective learning types, relevance and institutional and social conditions. This expanded perspective will make it possible to identify the factors that foster and limit benefits and reflect them in practice.}, subject = {Theaterp{\"a}dagogik}, language = {en} } @article{IrrgangSteffensEgermann2020, author = {Irrgang, Melanie and Steffens, Jochen and Egermann, Hauke}, title = {From acceleration to rhythmicity: Smartphone-assessed movement predicts properties of music}, series = {Journal of New Music Research}, volume = {4}, journal = {Journal of New Music Research}, number = {7}, publisher = {Taylor \& Francis}, doi = {10.1080/09298215.2020.1715447}, pages = {1 -- 14}, year = {2020}, language = {en} } @misc{deBanffyHall2013, author = {de B{\´a}nffy-Hall, Alicia}, title = {Fresh Eyes on Music: lessons for community music and music education}, series = {Sounding Board}, journal = {Sounding Board}, issn = {1464-6730}, year = {2013}, language = {en} } @incollection{GraessleMueller2026, author = {Gr{\"a}ßle, Kathrin and M{\"u}ller, Regine}, title = {Freie Tr{\"a}ger [Im Erscheinen]}, series = {Taschenw{\"o}rterbuch Soziale Arbeit}, booktitle = {Taschenw{\"o}rterbuch Soziale Arbeit}, editor = {Thole, Werner and H{\"o}blich, Davina and Ahmed, Sarina}, edition = {3. {\"u}berarbeitete Auflage}, publisher = {Julius Klinkhardt}, address = {Bad Heilbrunn}, year = {2026}, language = {en} } @inproceedings{HerderDaemenHaufsBrusbergetal.2015, author = {Herder, Jens and Daemen, Jeff and Haufs-Brusberg, Peter and Abdel Aziz, Isis}, title = {Four Metamorphosis States in a Distributed Virtual (TV) Studio: Human, Cyborg, Avatar, and Bot - Markerless Tracking and Feedback for Realtime Animation Control}, series = {Virtual Realities: International Dagstuhl Seminar, Dagstuhl Castle, Germany, June 9-14, 2013, Revised Selected Papers}, volume = {LNCS, 8844}, booktitle = {Virtual Realities: International Dagstuhl Seminar, Dagstuhl Castle, Germany, June 9-14, 2013, Revised Selected Papers}, editor = {Brunnett, Guido and Coquillart, Sabine and van Liere, Robert and Welch, Gregory and V{\´a}ša, Libor}, publisher = {Springer}, address = {Cham}, isbn = {978-3-319-17042-8}, doi = {10.1007/978-3-319-17043-5_2}, pages = {16 -- 32}, year = {2015}, language = {en} } @inproceedings{BurgaDaemenDjuderijaetal.2013, author = {Burga, Jose and Daemen, Jeff and Djuderija, Sascha and Gnehr, Maren and Goossens, Lars and Hartz, Sven and Haufs-Brusberg, Peter and Herder, Jens and Ibrahim, Mohammed and Koop, Nikolas and Leske, Christophe and Meyer, Laurid and M{\"u}ller, Antje and Salgert, Bj{\"o}rn and Schroeder, Richard and Thiele, Simon}, title = {Four Metamorphosis States in a Distributed Virtual (TV) Studio: Human, Cyborg, Avatar, and Bot}, series = {10th International Conference on Visual Media Production (CVMP 2013), London}, booktitle = {10th International Conference on Visual Media Production (CVMP 2013), London}, address = {London}, year = {2013}, abstract = {The major challenge in virtual studio technology is the interaction between the actor and virtual objects. Within a distributed live production, two locally separated markerless tracking systems where used simultaneously alongside a virtual studio. The production was based on a fully tracked actor, cyborg (half actor, half graphics), avatar, and a bot. All participants could interact and throw a virtual disc. This setup is compared and mapped to Milgram's continuum and technical challenges are described.}, language = {en} } @incollection{Haeusler2019, author = {H{\"a}usler, Alexander}, title = {Forms of Right-Wing Populism: The Example Alternative for Germany (AfD)}, series = {Stifled Progress - International Perspectives on Social Work and Social Policy in the Era of Right-Wing Populism}, booktitle = {Stifled Progress - International Perspectives on Social Work and Social Policy in the Era of Right-Wing Populism}, editor = {Fischer, J{\"o}rg and Dunn, Kerry}, publisher = {Verlag Barbara Budrich}, address = {Opladen}, isbn = {9783847413233}, doi = {10.2307/j.ctvfrxr60.4}, pages = {17 -- 32}, year = {2019}, language = {en} } @article{HuberStrehleSchnaussetal.2015, author = {Huber, Florian and Strehle, Dan and Schnauß, J{\"o}rg and K{\"a}s, Josef}, title = {Formation of regularly spaced networks as a general feature of actin bundle condensation by entropic forces}, series = {New Journal of Physics}, volume = {17}, journal = {New Journal of Physics}, number = {4}, publisher = {IOP Publishing}, issn = {1367-2630}, doi = {10.1088/1367-2630/17/4/043029}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-34833}, year = {2015}, language = {en} } @article{EmanuelssonHallquistKristensenetal.2013, author = {Emanuelsson, E. U. and Hallquist, M. and Kristensen, K. and Glasius, M. and Bohn, Birger and Fuchs, H. and Kammer, B. and Kiendler-Scharr, A. and Nehr, Sascha and Rubach, F. and Tillmann, R. and Wahner, A. and Wu, H.-C. and Mentel, Th. F.}, title = {Formation of anthropogenic secondary organic aerosol (SOA) and its influence on biogenic SOA properties}, series = {Atmospheric Chemistry and Physics}, volume = {13}, journal = {Atmospheric Chemistry and Physics}, number = {5}, publisher = {Copernicus}, issn = {1680-7324}, doi = {10.5194/acp-13-2837-2013}, pages = {2837 -- 2855}, year = {2013}, abstract = {Abstract. Secondary organic aerosol (SOA) formation from mixed anthropogenic and biogenic precursors has been studied exposing reaction mixtures to natural sunlight in the SAPHIR chamber in J{\"u}lich, Germany. In this study aromatic compounds served as examples of anthropogenic volatile organic compound (VOC) and a mixture of α-pinene and limonene as an example for biogenic VOC. Several experiments with exclusively aromatic precursors were performed to establish a relationship between yield and organic aerosol mass loading for the atmospheric relevant range of aerosol loads of 0.01 to 10 μg m-3. The yields (0.5 to 9\%) were comparable to previous data and further used for the detailed evaluation of the mixed biogenic and anthropogenic experiments. For the mixed experiments a number of different oxidation schemes were addressed. The reactivity, the sequence of addition, and the amount of the precursors influenced the SOA properties. Monoterpene oxidation products, including carboxylic acids and dimer esters were identified in the aged aerosol at levels comparable to ambient air. OH radicals were measured by Laser Induced Fluorescence, which allowed for establishing relations of aerosol properties and composition to the experimental OH dose. Furthermore, the OH measurements in combination with the derived yields for aromatic SOA enabled application of a simplified model to calculate the chemical turnover of the aromatic precursor and corresponding anthropogenic contribution to the mixed aerosol. The estimated anthropogenic contributions were ranging from small (\≈8\%) up to significant fraction (50\%) providing a suitable range to study the effect of aerosol composition on the aerosol volatility (volume fraction remaining (VFR) at 343 K: 0.86-0.94). The aromatic aerosol had higher oxygen to carbon ratio O/C and was less volatile than the biogenic fraction. However, in order to produce significant amount of aromatic SOA the reaction mixtures needed a higher OH dose that also increased O/C and provided a less volatile aerosol. The SOA yields, O/C, and f44 (the mass fraction of CO2+ ions in the mass spectra which can be considered as a measure of carboxylic groups) in the mixed photo-chemical experiments could be described as linear combinations of the corresponding properties of the pure systems. For VFR there was in addition an enhancement effect, making the mixed aerosol significantly less volatile than what could be predicted from the pure systems. A strong positive correlation was found between changes in volatility and O/C with the exception during dark hours where the SOA volatility decreased while O/C did not change significantly. Thus, this change in volatility under dark conditions as well as the anthropogenic enhancement is due to chemical or morphological changes not affecting O/C.}, language = {en} } @techreport{DeckertKeszlerSchmitzetal.2022, author = {Deckert, Carsten and Keszler, Julia and Schmitz, Helen and Mohya, Ahmed}, title = {Forecasting Game: Teaching Prospective Engineers Quantitative Forecasting Techniques with a Simulation Game}, address = {D{\"u}sseldorf}, organization = {Hochschule D{\"u}sseldorf}, issn = {2627-8375}, doi = {10.20385/opus4-3905}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-39057}, pages = {43}, year = {2022}, abstract = {In order to determine demand as precisely as possible, many businesses use several forecasting methods. The aim of forecasting is to determine future demand based on data from the past. The use of a specific method is not always easy and depends on a number of factors. To help prospective engineers find the most suitable forecasting method for a specific problem, a forecasting game was developed and then evaluated. The paper describes the design and the evaluation of the forecasting game. In order to provide an overview of existing forecasting methods, the first part of the paper examined the mathematical fundamentals of eight different forecasting methods and outlined the requirements for their application. The second part of the paper describes the creation of a forecasting game in which prospective engineers can learn how to determine the appropriate forecasting method for specific scenarios. In total, five scenarios covering the three different demand patterns (linear/stationary, trend and seasonal) as well as the forecast quality methods were developed and can be played through. For each scenario, the player has to choose the most appropriate forecasting method for a specific problem based on a self-created task description. To make the game as realistic as possible, a fictional company with a background story was designed. The last part was about the evaluation of the forecasting game. For the evaluation, a student survey to gather the opinions of the students was conducted. The results of the student survey show an overall positive evaluation of the simulation game by the students. However, the test also showed that the game takes a certain amount of time. Since only 15 of the approximately 30 students who tested the game participated in the evaluation, the results are not significant.}, language = {en} } @incollection{Schroeder2023, author = {Schr{\"o}der, Joachim}, title = {Forced Accommodation for Jews in the Context of the Deportations at the D{\"u}sseldorf Abattoir (1939-1944)}, series = {Deportations in the Nazi Era. Sources and Research}, volume = {2}, booktitle = {Deportations in the Nazi Era. Sources and Research}, editor = {Borggr{\"a}fe, Henning and Jah, Akim}, publisher = {De Gruyter}, isbn = {9783110746464}, doi = {10.1515/9783110746464-014}, pages = {229 -- 248}, year = {2023}, abstract = {During the period 1941 to 1944, the former D{\"u}sseldorf abattoir served as an assembly camp for almost 6,000 Jewish men, women and children from the administrative district of D{\"u}sseldorf prior to their deportation. Their deportation was the end of a long process of disenfranchisement and social isolation, the penultimate stage of which was eviction from their own or rented housing and confinement in forced accommodation: a 'Judenhaus' ('Jews house', a tenement building where Jews were housed), communal accommodation or a camp. This paper investigates for the first time the background to and the process of 'residential segregation' in this region. It names the various actors of local municipal authorities and the NSDAP involved and uses examples to describe the situation faced by those who were persecuted.}, subject = {Segregation (Soziologie)}, language = {en} } @inproceedings{KrieterZerrerPuschmannetal.2024, author = {Krieter, Philipp and Zerrer, Patrick and Puschmann, Cornelius and Geise, Stephanie}, title = {Following Topics Across All Apps and Media Formats: Mobile Keyword Tracking as a Privacy-Friendly Data Source in Mobile Media Research}, series = {UMAP Adjunct '24: Adjunct Proceedings of the 32nd ACM Conference on User Modeling, Adaptation and Personalization, Cagliari Italy, July 1 - 4, 2024}, booktitle = {UMAP Adjunct '24: Adjunct Proceedings of the 32nd ACM Conference on User Modeling, Adaptation and Personalization, Cagliari Italy, July 1 - 4, 2024}, editor = {Boratto, Ludovico and Gena, Cristina and Marras, Mirko and Germanakos, Panagiotis and Popescus, Elvira}, publisher = {ACM}, address = {New York}, isbn = {979-8-4007-0466-6}, doi = {10.1145/3631700.3664879}, pages = {126 -- 131}, year = {2024}, language = {en} } @article{RueckertIbrarAhmedetal.2024, author = {R{\"u}ckert, Frank Ulrich and Ibrar, Burhan and Ahmed, Arslan and Allweyer, Benjamin and H{\"u}bner, Dirk and Klinger, Friedrich and Knaus, Hermann and Benim, Ali Cemal}, title = {Fluid flow and heat transfer of a novel passive cooling system for gearless wind turbines with a power range of 3-12 MW}, series = {Energy}, volume = {312}, journal = {Energy}, publisher = {Elsevier}, issn = {0360-5442}, doi = {10.1016/j.energy.2024.133478}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-46594}, year = {2024}, abstract = {Today, the gearless horizontal axis wind turbines are mainstream in wind energy industry. High demands of electric power led to bigger systems and active cooling reduces the overall efficiency of the turbines. Passive cooling systems have been examined for the first time for a gearless wind energy generator with power range of 3-12 MW. With further developed heat conductors, it is possible to operate a wind generator in a larger power class with passive cooling components. This is accompanied by enormous cost savings due to elimination of costs for active cooling elements such as the use of fans, pumps, and heat exchangers. An additional factor is the significant reduction in necessary maintenance due to the minimized incidence of corrosion and wear. Design of the cooling fins and an ideal position of the generator within the housing of the wind turbine has been objectives. Mandatory is that maximum temperatures of the generator fins should stay under 155 °C, which could be reached with several designs for different heat exchanger geometries.}, subject = {Windturbine}, language = {en} } @article{WeberKuttlerWeber2006, author = {Weber, Stephan and Kuttler, Wilhelm and Weber, Konradin}, title = {Flow characteristics and particle mass and number concentration variability within a busy urban street canyon}, series = {Atmospheric Environment}, volume = {40}, journal = {Atmospheric Environment}, number = {39}, publisher = {Elsevier}, doi = {10.1016/j.atmosenv.2006.07.002}, pages = {7565 -- 7578}, year = {2006}, language = {en} } @article{MarcinkowskideHaasKohler2025, author = {Marcinkowski, Frank and de Haas, Hella and Kohler, Sarah}, title = {Flight or fight? - How the coronavirus pandemic has affected scientists' willingness to engage with the public}, series = {Humanities and Social Sciences Communications}, volume = {12}, journal = {Humanities and Social Sciences Communications}, publisher = {Springer Nature}, issn = {2662-9992}, doi = {10.1057/s41599-025-05023-3}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-60444}, pages = {11}, year = {2025}, abstract = {During the coronavirus pandemic, scientists who worked to overcome the outbreak received recognition, but also opposition and even hostility. This article examines how the experience of the pandemic has affected the willingness of scientists to engage with the public. Derived from a comprehensive survey of 4207 scientists at German universities and research institutions, animosity towards scientists during the pandemic has created a sense of insecurity that may cause them to withdraw from the public eye. Depending on the relative strength of two cognitive appraisals, the severity of the threat and the appropriateness of the retreat option, the likelihood of respondents engaging with the public varies significantly.}, subject = {COVID-19-Pandemie}, language = {en} } @inproceedings{WoeldeckeMarinosGeiger2014, author = {W{\"o}ldecke, Bj{\"o}rn and Marinos, Dionysios and Geiger, Christian}, title = {Flexible Registration of Multiple Displays}, series = {Proceedings of The International Symposium on Pervasive Displays, Copenhagen, 03.06.2014-04.06.2014}, booktitle = {Proceedings of The International Symposium on Pervasive Displays, Copenhagen, 03.06.2014-04.06.2014}, editor = {Gehring, Sven and Boring, Sebastian and Quigley, Aaron}, publisher = {ACM}, address = {New York}, isbn = {9781450329521}, doi = {10.1145/2611009.2611030}, pages = {86 -- 91}, year = {2014}, language = {en} } @inproceedings{RosenthalBlaettermannVersuemer2024, author = {Rosenthal, Fabian and Bl{\"a}ttermann, Patrick and Vers{\"u}mer, Siegbert}, title = {flexcv: Python package for fitting, comparing, and logging multiple machine learning models using various cross-validation methods [Poster]}, series = {Fortschritte der Akustik - DAGA 2024, 18. - 21. M{\"a}rz 2024, Hannover}, booktitle = {Fortschritte der Akustik - DAGA 2024, 18. - 21. M{\"a}rz 2024, Hannover}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik e.V.}, address = {Berlin}, year = {2024}, abstract = {The evaluation of listening experiments and studies on acoustics not only requires basic knowledge of statistics, but also poses challenges in the implementation of different methodologies. Especially for small sample sizes and peculiarities regarding hierarchical data structures, the need to individualize evaluation scripts arises. Therefore, we introduce flexcv, a powerful machine learning package for Python for evaluating various models on experimental tabular data, especially with small sample sizes. It supports random effects evaluation (including random slopes) for both linear and non-linear regressors, providing broad applicability to different experiments and research questions.flexcv quickly allows to perform nested cross-validation on a variety of models for comparison with each other. On the one hand, the implementation of a flexible interface simplifies the exchange of methods in the script, allowing researchers to change cross-validation methods without having to touch the actual cross-validation code. On the other hand, extensive online logging allows and simplifies the evaluation and experiment tracking along the process and different machines.}, language = {en} } @misc{RosenthalVersuemerBlaettermann2024, author = {Rosenthal, Fabian and Vers{\"u}mer, Siegbert and Bl{\"a}ttermann, Patrick}, title = {flexcv: Easy and flexible nested cross validation for tabular data in python}, edition = {Version v24.0-beta}, publisher = {Zenodo}, address = {Genf}, doi = {10.5281/zenodo.10160846}, year = {2024}, abstract = {Python package customizing nested cross validation for tabular data.}, subject = {Software}, language = {en} } @inproceedings{WeberFischerVogeletal.2013, author = {Weber, Konradin and Fischer, Christian and Vogel, Andreas and Pohl, Tobias and B{\"o}hlke, Christoph and Lau, Hendrik and Eliasson, Jonas and Palsson, Thorgeir}, title = {First results of an airborne release of volcanic ash for testing of volcanic ash plume measurement instruments}, series = {Recent Advances in Energy and Environmental Management}, volume = {Energy, Environmental and Structural Engineering Series 13}, booktitle = {Recent Advances in Energy and Environmental Management}, editor = {Mladenov, Valeri and Tasho, Tashev and Hui, Wang and Ivan, Kralov and Sergey, Stankevich and Pelin, Yildiz and Jon, Burley}, publisher = {WSEAS}, pages = {169 -- 172}, year = {2013}, subject = {Vulkanasche}, language = {en} } @article{Benim1989, author = {Benim, Ali Cemal}, title = {Finite element solution of an enclosed turbulent diffusion flame}, series = {International Journal for Numerical Methods in Fluids}, volume = {9}, journal = {International Journal for Numerical Methods in Fluids}, number = {3}, publisher = {Wiley}, issn = {0271-2091}, doi = {10.1002/fld.1650090305}, pages = {289 -- 303}, year = {1989}, abstract = {A finite element formulation of enclosed turbulent diffusion flames is presented. A primitive variables approach is preferred in the analysis. A mixed interpolation is employed for the velocity and pressure. In the solution of the Navier-Stokes equations, a segregated formulation is adopted, where the pressure discretization equation is obtained directly from the discretized continuity equation, considering the velocity-pressure relationships in the discretized momentum equations. The state of turbulence is defined by a κ-ϵ model. Near solid boundaries, a wall function approach is employed. The combustion rates are estimated using the eddy dissipation concept. The expensive direct treatment of the integrodifferential equations of radiation is avoided by employing the moment method, which allows the derivation of an approximate local field equation for the radiation intensity. The proposed finite element model is verified by investigating a technical turbulent diffusion flame of semi-industrial size, and comparing the results with experiments and finite difference predictions.}, subject = {Finite-Elemente-Methode}, language = {en} } @article{Benim1990, author = {Benim, Ali Cemal}, title = {Finite element analysis of confined turbulent swirling flows}, series = {International Journal for Numerical Methods in Fluids}, volume = {11}, journal = {International Journal for Numerical Methods in Fluids}, number = {6}, publisher = {Wiley}, issn = {0271-2091}, doi = {10.1002/fld.1650110602}, pages = {697 -- 717}, year = {1990}, abstract = {The finite element method is applied to incompressible and statistically steady confined turbulent swirling flows. A velocity-pressure formulation is employed. The momentum and continuity equations are solved using a segregated algorithm. Two turbulence models, namely the standard κ-ε model and the algebraic stress model, are considered. It is shown that the algebraic stress model leads to significantly more accurate results in swirling flows compared to the κ-ε model. A novel way of implementing the algebraic stress model is presented in which the stresses are coupled to the Navier-Stokes equations in such a way that they 'correct' the effective viscosity hypothesis. This formulation seems to provide a convenient approach for finite elements. In deriving the discretization equations, a streamline-upwind/Petrov-Galerkin method is employed. Comparisons performed between various upwind schemes show that the numerical solution may be substantially affected by the particular upwind procedure used. The analysis is extended to the prediction of particle motion in turbulent swirling flow fields. Here the fluid turbulence is modelled adopting a stochastic approach. The influence of turbulence modelling on particle movement is investigated.}, subject = {Finite-Elemente-Methode}, language = {en} } @inproceedings{WillersCurcicBosch2017, author = {Willers, Oliver and Curcic, Michael and Bosch, Robert}, title = {Fingerprinting MEMS Gyroscopes}, series = {11th Smart Systems Integration Conference 2017 International Conference and Exhibition on Integration Issues of Miniaturized Systems Cork, Ireland 8-9 March 2017}, booktitle = {11th Smart Systems Integration Conference 2017 International Conference and Exhibition on Integration Issues of Miniaturized Systems Cork, Ireland 8-9 March 2017}, editor = {Thomas, Otto}, publisher = {Curran Associates, Inc.}, isbn = {978-1-5108-4478-0}, pages = {133}, year = {2017}, language = {en} } @article{HeninPetitRohwetteretal.2011, author = {Henin, Stefano and Petit, Yannick and Rohwetter, Philipp and Stelmaszczyk, Kamil and Hao, Zuoqiang and Nakaema, Walter Morinobu and Vogel, Andreas and Pohl, Tobias and Schneider, Friedhelm and Kasparian, J{\´e}r{\^o}me and Weber, Konradin and W{\"o}ste, Ludger and Wolf, Jean-Pierre}, title = {Field measurements suggest the mechanism of laser-assisted water condensation}, series = {Nature Communications}, volume = {2}, journal = {Nature Communications}, number = {1}, publisher = {Springer Nature}, issn = {2041-1723}, doi = {10.1038/ncomms1462}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-52439}, year = {2011}, abstract = {Because of the potential impact on agriculture and other key human activities, efforts have been dedicated to the local control of precipitation. The most common approach consists of dispersing small particles of dry ice, silver iodide, or other salts in the atmosphere. Here we show, using field experiments conducted under various atmospheric conditions, that laser filaments can induce water condensation and fast droplet growth up to several μm in diameter in the atmosphere as soon as the relative humidity exceeds 70\%. We propose that this effect relies mainly on photochemical formation of p.p.m.-range concentrations of hygroscopic Hno3, allowing efficient binary Hno3-H2o condensation in the laser filaments. Thermodynamic, as well as kinetic, numerical modelling based on this scenario semiquantitatively reproduces the experimental results, suggesting that particle stabilization by Hno3 has a substantial role in the laser-induced condensation.}, subject = {Kondensation}, language = {en} } @incollection{LutzBoehnkeHuininketal.2013, author = {Lutz, Katharina and Boehnke, Mandy and Huinink, Johannes and Tophoven, Silke}, title = {Female employment, reconciliation policies, and childbearing intentions in East and West Germany.}, series = {Childbearing, women's employment and work-life balance policies in contemporary Europe}, booktitle = {Childbearing, women's employment and work-life balance policies in contemporary Europe}, editor = {Ol{\´a}h, Livia Sz and Frątczak, Ewa}, publisher = {Palgrave Macmillan}, address = {New York}, isbn = {1137318546}, pages = {97 -- 134}, year = {2013}, language = {en} } @article{StuhlsatzLippelZielke2012, author = {Stuhlsatz, Andr{\´e} and Lippel, Jens and Zielke, Thomas}, title = {Feature extraction with deep neural networks by a generalized discriminant analysis}, series = {IEEE transactions on neural networks and learning systems}, volume = {23}, journal = {IEEE transactions on neural networks and learning systems}, number = {4}, publisher = {IEEE}, doi = {10.1109/tnnls.2012.2183645}, pages = {596 -- 608}, year = {2012}, abstract = {We present an approach to feature extraction that is a generalization of the classical linear discriminant analysis (LDA) on the basis of deep neural networks (DNNs). As for LDA, discriminative features generated from independent Gaussian class conditionals are assumed. This modeling has the advantages that the intrinsic dimensionality of the feature space is bounded by the number of classes and that the optimal discriminant function is linear. Unfortunately, linear transformations are insufficient to extract optimal discriminative features from arbitrarily distributed raw measurements. The generalized discriminant analysis (GerDA) proposed in this paper uses nonlinear transformations that are learnt by DNNs in a semisupervised fashion. We show that the feature extraction based on our approach displays excellent performance on real-world recognition and detection tasks, such as handwritten digit recognition and face detection. In a series of experiments, we evaluate GerDA features with respect to dimensionality reduction, visualization, classification, and detection. Moreover, we show that GerDA DNNs can preprocess truly high-dimensional input data to low-dimensional representations that facilitate accurate predictions even if simple linear predictors or measures of similarity are used.}, language = {en} } @inproceedings{StuhlsatzLippelZielke2010, author = {Stuhlsatz, Andr{\´e} and Lippel, Jens and Zielke, Thomas}, title = {Feature Extraction for Simple Classification}, series = {2010 20th International Conference on Pattern Recognition, August 23 - 26, 2010 , Istanbul, Turkey}, booktitle = {2010 20th International Conference on Pattern Recognition, August 23 - 26, 2010 , Istanbul, Turkey}, publisher = {IEEE}, isbn = {978-0-7695-4109-9}, issn = {1051-4651}, doi = {10.1109/ICPR.2010.377}, pages = {1525 -- 1528}, year = {2010}, language = {en} } @inproceedings{GaidaJahrWeinberg2013, author = {Gaida, Philipp and Jahr, Andreas and Weinberg, Kerstin}, title = {FEA and experimental validation of an electroactive polymer actuator [Abstract]}, series = {Third International Conference on Material Modelling incorporating the Thirteenth European Mechanics of Materials Conference, September 8-11, 2013,Warsaw, Poland}, booktitle = {Third International Conference on Material Modelling incorporating the Thirteenth European Mechanics of Materials Conference, September 8-11, 2013,Warsaw, Poland}, number = {185}, editor = {Dłużewsk, Paweł and Jurczak, Grzegorz and Young, Toby D.}, publisher = {Instytut Podstawowych Problem{\´o}w Techniki Polskiej Akademii Nauk}, address = {Warszawa}, isbn = {978-83-89687-83-8}, year = {2013}, language = {en} } @article{ZanderBogElhaddadetal.2014, author = {Zander, Nils and Bog, Tino and Elhaddad, Mohamed and Espinoza, R. and Hu, H. and Joly, A. and Wu, C. and Zerbe, P. and D{\"u}ster, Alexander and Kollmannsberger, Stefan and Parvizian, J. and Ruess, Martin and Schillinger, Dominik and Rank, Ernst}, title = {FCMLab: A finite cell research toolbox for MATLAB}, series = {Advances in Engineering Software}, volume = {74}, journal = {Advances in Engineering Software}, publisher = {Elsevier}, issn = {0965-9978}, doi = {10.1016/j.advengsoft.2014.04.004}, pages = {49 -- 63}, year = {2014}, language = {en} } @article{AntonRulandKaluzaetal.2015, author = {Anton, Johan and Ruland, Holger and Kaluza, Stefan and Muhler, Martin}, title = {Fast and Reproducible Testing of Cu-Co-Based Catalysts Applied in the Conversion of Synthesis Gas to Ethanol and Higher Alcohols}, series = {Catalysis Letters}, volume = {145}, journal = {Catalysis Letters}, number = {7}, publisher = {Springer}, doi = {10.1007/s10562-015-1543-2}, pages = {1374 -- 1381}, year = {2015}, language = {en} } @article{ZellerVirchow2024, author = {Zeller, Michael C. and Virchow, Fabian}, title = {Far-right leadership in comparison: shifts and continuities in German-speaking movements}, series = {Social Movement Studies}, journal = {Social Movement Studies}, publisher = {Informa}, issn = {1474-2837}, doi = {10.1080/14742837.2024.2430974}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-50521}, pages = {1 -- 23}, year = {2024}, abstract = {Leadership has long been acknowledged as a crucial feature of social movement activity. Theorisation has delved into the types of leadership and, more recently, the activities performed by leaders. However, comparative research on leadership and detection of any changes over time is scant. Our paper attends to these tasks by looking at the activities of two German-speaking far-right leaders. For many years, Christian Worch was one of the most active and influential neo-Nazi leaders in Germany, communicating much of his activity and strategy in the mid-2000s through a regular circular (Rundbriefe). Similarly, Martin Sellner, both as leader of the Identitarian movement and independent activist, today exercises an outsized role in the German-speaking far-right scene, including through his regular publications in the magazines Compact and Sezession. Our paper uses data of Worch's and Sellner's writings, scraped from webpages and gathered from archives, in a mixed-methods comparative design to identify the tasks performed by these leaders, and how frequently. Quantitative text analysis techniques guide the qualitative evaluation of leaders' activities and reveal shifts - and continuities - in far-right movement leadership. The paper thereby contributes to scholarship on an important aspect of contemporary far-right movements as well as broader social movement literature on the topic of leadership.}, subject = {Rechtsradikalismus}, language = {en} } @techreport{GreilSchwarzStein2018, author = {Greil, Stefan and Schwarz, Christian and Stein, Stefan}, title = {Fairness and the Arm's Length Principle in a Digital Economy}, number = {42}, address = {D{\"u}sseldorf}, issn = {2365-3361}, doi = {10.20385/2365-3361/2018.42}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-12029}, year = {2018}, abstract = {The OECD Base Erosion Profit Shifting (BEPS) Initiative as well as the current fairness oriented public discussion regarding the taxation of digital business models highlight the importance and complexity of the arm's length principle. In a theoretical model of an internationally fragmented digital good's production process, we show that fairness considerations of tax authorities (namely inequity aversion) can result in a falling apart between a perceived "fair" and arm's length distribution of profits across tax jurisdictions. Our model predicts that a multinational firm follows the fundamental paradigm of international taxation, i.e. the arm's length principle, to properly incentivize internal agents involved in the production of a digital good. However, with inequity averse tax authorities, we find that tax authorities "prefer" a more equal distribution of profits compared to the arm's length allocation. From a multinational firm's perspective, inequity aversion among tax authorities dampens the strategic effect to - in accordance with arm's length principle - shift profits to low tax countries.}, language = {en} } @inproceedings{MarinosGeiger2014, author = {Marinos, Dionysios and Geiger, Christian}, title = {Facilitating the creation of natural interactions for live audiovisual performances}, series = {Proceedings of the 9th Audio Mostly on A Conference on Interaction With Sound - AM '14, Aalborg, 01.10.2014 - 03.10.2014}, booktitle = {Proceedings of the 9th Audio Mostly on A Conference on Interaction With Sound - AM '14, Aalborg, 01.10.2014 - 03.10.2014}, editor = {Grimshaw, Mark and Walther-Hansen, Mads}, publisher = {ACM Press}, address = {New York}, isbn = {9781450330329}, doi = {10.1145/2636879.2636893}, pages = {1 -- 6}, year = {2014}, language = {en} } @article{KampaFinkeStalderetal.2022, author = {Kampa, Miriam and Finke, Johannes and Stalder, Tobias and Bucher, Leandra and Klapperich, Holger and Mertl, Fabian and Zimmer, Christian and Geiger, Christian and Hassenzahl, Marc and Klucken, Tim}, title = {Facilitating relaxation and stress reduction in healthy participants through a virtual reality intervention: study protocol for a non-inferiority randomized controlled trial}, series = {Trials}, volume = {23}, journal = {Trials}, publisher = {BMC}, issn = {1745-6215}, doi = {10.1186/s13063-022-06307-8}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-40118}, year = {2022}, language = {en} } @inproceedings{ScherpFranzSaathoffetal.2009, author = {Scherp, Ansgar and Franz, Thomas and Saathoff, Carsten and Staab, Steffen}, title = {F--a model of events based on the foundational ontology dolce+DnS ultralight}, series = {Proceedings of the 5th International Conference on Knowledge Capture (K-CAP 2009), September 1-4, 2009, Redondo Beach, California, USA}, booktitle = {Proceedings of the 5th International Conference on Knowledge Capture (K-CAP 2009), September 1-4, 2009, Redondo Beach, California, USA}, publisher = {ACM}, address = {Redondo Beach}, doi = {10.1145/1597735.1597760}, pages = {137 -- 144}, year = {2009}, language = {en} } @incollection{NiemannFusseneckerSchloesser2019, author = {Niemann, J{\"o}rg and Fussenecker, Claudia and Schl{\"o}sser, Martin}, title = {Eye Tracking for Quality Control in Automotive Manufacturing}, series = {Systems, Software and Services Process Improvement}, booktitle = {Systems, Software and Services Process Improvement}, editor = {Walker, Alastair and O'Connor, Rory V. and Messnarz, Richard}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {978-3-030-28004-8}, doi = {10.1007/978-3-030-28005-5_22}, pages = {289 -- 298}, year = {2019}, language = {en} } @inproceedings{JakobsBoeldtSelbachetal.2019, author = {Jakobs, Christoph and B{\"o}ldt, Sebastian and Selbach, Dustin and Steffens, Jochen}, title = {Extreme response style in listening tests}, series = {Proceedings of the 23rd International Congress on Acoustics: integrating 4th EAA Euroregio 2019 : 9-13 September 2019 in Aachen, Germany}, booktitle = {Proceedings of the 23rd International Congress on Acoustics: integrating 4th EAA Euroregio 2019 : 9-13 September 2019 in Aachen, Germany}, address = {Aachen}, isbn = {978-3-939296-15-7}, doi = {10.18154/RWTH-CONV-239966}, year = {2019}, language = {en} } @inproceedings{MayaKrieterWolfetal.2022, author = {Maya, Fatima and Krieter, Philipp and Wolf, Karsten D. and Breiter, Andreas}, title = {Extracting Production Style Features of Educational Videos with Deep Learning}, series = {Proceedings of DELFI Workshops 2022 Karlsruhe, 12. September 2022}, booktitle = {Proceedings of DELFI Workshops 2022 Karlsruhe, 12. September 2022}, editor = {Mandausch, Martin and Henning, Peter A.}, publisher = {Gesellschaft f{\"u}r Informatik e.V.}, address = {Bonn}, doi = {10.18420/delfi2022-ws-23}, pages = {123 -- 132}, year = {2022}, abstract = {Enforced by the pandemic, the production of videos in educational settings and their availability on learning platforms allow new forms of video-based learning. This has a strong benefit of covering multiple topics with different design styles and facilitating the learning experience. Consequently, research interest in video-based learning has increased remarkably, with many studies focusing on examining the diverse visual properties of videos and their impact on learner engagement and knowledge gain. However, manually analysing educational videos to collect metadata and to classify videos for quality assessment is a time-consuming activity. In this paper, we address the problem of automatic video feature extraction related to video production design. To this end, we introduce a novel use case for object detection models to recognize the human embodiment and the type of teaching media used in the video. The results obtained on a small-scale custom dataset show the potential of deep learning models for visual video analysis. This will allow for future use in developing an automatic video assessment system to reduce the workload for teachers and researchers.}, language = {en} } @misc{VersuemerSteffensRosenthal2023, author = {Vers{\"u}mer, Siegbert and Steffens, Jochen and Rosenthal, Fabian}, title = {Extensive crowdsourced dataset of in-situ evaluated binaural soundscapes of private dwellings containing subjective sound-related and situational ratings along with person factors to study time-varying influences on sound perception - research data}, edition = {V.01.1}, address = {Zenodo}, doi = {10.5281/zenodo.7193937}, year = {2023}, abstract = {The soundscape approach highlights the role of situational factors in sound evaluations; however, only a few studies have applied a multi-domain approach including sound-related, person-related, and time-varying situational variables. Therefore, we conducted a study based on the Experience Sampling Method to measure the relative contribution of a broad range of potentially relevant acoustic and non-auditory variables in predicting indoor soundscape evaluations. Here we present the comprehensive dataset for which 105 participants reported temporally (rather) stable trait variables such as noise sensitivity, trait affect, and quality of life. They rated 6.594 situations regarding the soundscape standard dimensions, perceived loudness, and the saliency of its sound components and evaluated situational variables such as state affect, perceived control, activity, and location. To complement these subject-centered data, we additionally crowdsourced object-centered data by having participants make binaural measurements of each indoor soundscape at their homes using a low-(self-)noise recorder. These recordings were used to compute (psycho-)acoustical indices such as the energetically averaged loudness level, the A-weighted energetically averaged equivalent continuous sound pressure level, and the A-weighted five-percent exceedance level. This complex hierarchical data can be used to investigate time-varying non-auditory influences on sound perception and to develop soundscape indicators based on the binaural recordings to predict soundscape evaluations.}, subject = {soundscape}, language = {en} } @inproceedings{YamazakiHerder2000, author = {Yamazaki, Yasuhiro and Herder, Jens}, title = {Exploring Spatial Audio Conferencing Functionality in Multiuser Virtual Environments}, series = {The Third International Conference on Collaborative Virtual Environments}, booktitle = {The Third International Conference on Collaborative Virtual Environments}, publisher = {ACM}, address = {San Francisco}, pages = {207 -- 208}, year = {2000}, abstract = {A chatspace was developed that allows conversation with 3D sound using networked streaming in a shared virtual environment. The system provides an interface to advanced audio features, such as a "whisper function" for conveying a confided audio stream. This study explores the use of spatial audio to enhance a user's experience in multiuser virtual environments.}, language = {en} } @article{LeiberGressHeinemann2015, author = {Leiber, Simone and Greß, Stefan and Heinemann, Stephanie}, title = {Explaining Different Paths in Social Health Insurance Countries - Health System Change and Cross-border Lesson-drawing between Germany, Austria and the Netherlands}, series = {Social Policy \& Administration}, volume = {49}, journal = {Social Policy \& Administration}, number = {1}, publisher = {Wiley}, doi = {10.1111/spol.12078}, pages = {88 -- 108}, year = {2015}, language = {en} } @article{BiswasMandalBoseetal.2023, author = {Biswas, Nirmalendu and Mandal, Dipak Kumar and Bose, Sharmistha and Manna, Nirmal K. and Benim, Ali Cemal}, title = {Experimental Treatment of Solar Chimney Power Plant — A Comprehensive Review}, series = {Energies}, volume = {16}, journal = {Energies}, number = {17}, publisher = {MDPI}, issn = {1996-1073}, doi = {10.3390/en16176134}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-46139}, pages = {41}, year = {2023}, abstract = {Solar chimney power plants (SCPPs) are encouraging sustainable energy sources due to their low cost, abundance, low maintenance, and eco-friendliness. However, despite significant efforts to optimize SCPP design, their efficiency and power generation capabilities remain limited. Researchers have explored modifications in plant geometry and hybridization to improve efficiency. Despite extensive work in this area, commercialization of SCPPs has not yet been achieved. Most of the research is numerical and may differ from real-world practical use. The number of experimental studies is also relatively small. To facilitate commercialization, further investigation with practical and feasible dimensions is required. This comprehensive review paper aims to provide an in-depth analysis of experimental approaches and advancements in the field of SCPPs. The paper begins with an introduction, highlighting the background, significance, and objectives of the review. It provides an overview of the plants, discussing their principles and operation as innovative renewable energy systems. The historical development and evolution of solar chimneys are explored, shedding light on their progression over time. Case studies of operational hybrid SCPPs are examined to showcase real-world applications and performance. The paper also addresses environmental impacts and sustainability considerations associated with SCPPs. Furthermore, recommendations for future research and development in this field are provided to guide researchers and industry professionals. This study focuses on the possibility of commercialization of both standalone and hybrid SCPPs.}, subject = {Erneuerbare Energien}, language = {en} } @article{FesekerKinellNeef2018, author = {Feseker, Daniel and Kinell, Mats and Neef, Matthias}, title = {Experimental Study on Pressure Losses in Circular Orifices With Inlet Cross Flow}, series = {Journal of Turbomachinery}, volume = {140}, journal = {Journal of Turbomachinery}, number = {7}, address = {ASME}, doi = {10.1115/1.4039842}, pages = {210}, year = {2018}, abstract = {The ability to understand and predict the pressure losses of orifices is important in order to improve the air flow within the secondary air system. This experimental study investigates the behavior of the discharge coefficient for circular orifices with inlet cross flow which is a common flow case in gas turbines. Examples of this are at the inlet of a film cooling hole or the feeding of air to a blade through an orifice in a rotor disk. Measurements were conducted for a total number of 38 orifices, covering a wide range of length-to-diameter ratios, including short and long orifices with varying inlet geometries. Up to five different chamfer-to-diameter and radius-to-diameter ratios were tested per orifice length. Furthermore, the static pressure ratio across the orifice was varied between 1.05 and 1.6 for all examined orifices. The results of this comprehensive investigation demonstrate the beneficial influence of rounded inlet geometries and the ability to decrease pressure losses, which is especially true for higher cross flow ratios where the reduction of the pressure loss in comparison to sharp-edged holes can be as high as 54\%. With some exceptions, the chamfered orifices show a similar behavior as the rounded ones but with generally lower discharge coefficients. Nevertheless, a chamfered inlet yields lower pressure losses than a sharp-edged inlet. The obtained experimental data were used to develop two correlations for the discharge coefficient as a function of geometrical as well as flow properties.}, language = {en} } @inproceedings{FesekerKinellNeef2017, author = {Feseker, Daniel and Kinell, Mats and Neef, Matthias}, title = {Experimental Study on Pressure Losses in Circular Orifices With Inlet Cross Flow}, series = {Proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition - 2017: presented at the ASME Turbo Expo 2017: Turbine Technical Conference and Exposition, June 26-30, 2017}, booktitle = {Proceedings of the ASME Turbo Expo: Turbine Technical Conference and Exposition - 2017: presented at the ASME Turbo Expo 2017: Turbine Technical Conference and Exposition, June 26-30, 2017}, editor = {The American Society of Mechanical Engineers,}, publisher = {The American Society of Mechanical Engineers}, address = {New York}, isbn = {978-0-7918-5088-6}, doi = {10.1115/GT2017-64143}, year = {2017}, abstract = {The ability to understand and predict the pressure losses of orifices is important in order to improve the air flow within the secondary air system. This experimental study investigates the behavior of the discharge coefficient for circular orifices with inlet cross flow which is a common flow case in gas turbines. Examples of this are at the inlet of a film cooling hole or the feeding of air to a blade through an orifice in a rotor disk. Measurements were conducted for a total number of 38 orifices, covering a wide range of length-to-diameter ratios, including short and long orifices with varying inlet geometries. Up to five different chamfer-to-diameter and radius-to-diameter ratios were tested per orifice length. Furthermore, the static pressure ratio across the orifice was varied between 1.05 and 1.6 for all examined orifices. The results of this comprehensive investigation demonstrate the beneficial influence of rounded inlet geometries and the ability to decrease pressure losses, which is especially true for higher cross flow ratios where the reduction of the pressure loss in comparison to sharp-edged holes can be as high as 54\%. With some exceptions, the chamfered orifices show a similar behavior as the rounded ones but with generally lower discharge coefficients. Nevertheless, a chamfered inlet yields lower pressure losses than a sharp-edged inlet. The obtained experimental data were used to develop two correlations for the discharge coefficient as a function of geometrical as well as flow properties.}, language = {en} } @article{DubberkeLinnemannAbbasetal.2018, author = {Dubberke, Frithjof H. and Linnemann, Matthias and Abbas, Wameedh Khider and Baumh{\"o}gger, Elmar and Priebe, Klaus-Peter and Roedder, Maximilian and Neef, Matthias and Vrabec, Jadran}, title = {Experimental setup of a cascaded two-stage organic Rankine cycle}, series = {Applied Thermal Engineering}, volume = {131}, journal = {Applied Thermal Engineering}, publisher = {Elsevier}, doi = {10.1016/j.applthermaleng.2017.11.137}, pages = {958 -- 964}, year = {2018}, abstract = {In combination with a bottoming cycle, operated with a pure fluid in transcritical mode, the usage of a zeotropic mixture as a working fluid appears to be exergetically favorable for power cycle efficiency in cascaded two-stage organic Rankine cycles (CORC). A CORC is set up and initially tested with cyclopentane and propane as working fluids in its high temperature and low temperature cycle, respectively. A thermal oil cycle serves as the heat source and is powered electrically with a maximum heat flow of 158 kW. The design of this experimental setup allows for a rapid replacement of individual components and for a wide range of conditions in terms of fluids and thermodynamic states. The components of all cycles and the measurement and control technology are described in detail. A testing procedure is presented, followed by a discussion of the measurement results, where it is shown that the intended concept of two cascaded organic Rankine cycles is operational and that the measured data are consistent.}, language = {en} } @article{LauxGotterEckertetal.2022, author = {Laux, Christoph and Gotter, Andreas and Eckert, Frank and Neef, Matthias}, title = {Experimental results of a low-pressure steam Rankine cycle with a novel water lubricated radial inflow turbine for the waste heat utilization of internal combustion engines}, series = {Energy Conversion and Management}, volume = {271}, journal = {Energy Conversion and Management}, publisher = {Elsevier}, issn = {0196-8904}, doi = {10.1016/j.enconman.2022.116265}, year = {2022}, language = {en} } @inproceedings{BatosJahrCorves2015, author = {Batos, Andrej and Jahr, Andreas and Corves, B.}, title = {Experimental Investigations for the Characterization of Cutting Processes on Biomaterials [Oralposter]}, series = {European Symposium and Exhibition on Biomaterials and Related Areas - Euro BioMAT 2015}, booktitle = {European Symposium and Exhibition on Biomaterials and Related Areas - Euro BioMAT 2015}, year = {2015}, language = {en} } @article{BhattacharyyaBenimChattopadhyayetal.2019, author = {Bhattacharyya, Suvanjan and Benim, Ali Cemal and Chattopadhyay, Himadri and Banerjee, Arnab}, title = {Experimental investigation of heat transfer performance of corrugated tube with spring tape inserts}, series = {Experimental Heat Transfer}, volume = {32}, journal = {Experimental Heat Transfer}, number = {5}, publisher = {Taylor \& Francis}, issn = {0891-6152}, doi = {10.1080/08916152.2018.1531955}, pages = {411 -- 425}, year = {2019}, language = {en} } @inproceedings{LauxGotterNeef2019, author = {Laux, Christoph and Gotter, Andreas and Neef, Matthias}, title = {Experimental investigation of a low pressure steam Rankine cycle for waste heat utilization of internal combustion engines}, series = {Proceedings of the 5th International Seminar on ORC Power Systems}, booktitle = {Proceedings of the 5th International Seminar on ORC Power Systems}, publisher = {The National Technical University of Athens (NTUA)}, address = {Athens}, isbn = {978-90-9032038-0}, year = {2019}, abstract = {High heat losses via exhaust gas and coolant in internal combustion engines (ICE) are the basis for numerous investigations regarding downstream processes for power generation. The most promising concepts are Organic Rankine Cycles (ORC) and Steam Rankine Cycles (SRC). In previous work of the Center of Innovative Energy Systems, D{\"u}sseldorf (Germany), the technical and economic feasibility of a low pressure SRC has been investigated and the advantages in comparison to organic Rankine cycles are highlighted. A distinctive feature of the cycle is the use of the ICE coolant heat for evaporation, which limits the cycles maximum steam pressure to values below atmospheric pressure. This work presents first results of a test rig with data reconciliation according to DIN 2048 to validate the simulation results and design calculations. As a basis for the experimental investigations, a gas fired CHP plant was selected. The design of the test rig is optimized for the operation in the laboratory, where the coolant heat is emulated by a tempering device and the exhaust heat of the CHP plant is emulated by a gas burner. With the designed test rig, it is possible to control the volume flow and the temperatures of the coolant and exhaust gas, so that different load conditions of the gas fired CHP plant can be investigated. For initial tests, the turbine in the SRC is replaced by a throttle to achieve the pressure drop of the turbine. The experimental results show, that the exhaust and coolant heat of a 36 kWel CHP plant can be emulated and the performance expectations of the cycle can be met in stable steady-state conditions. Based on the measurement results and the turbine design calculations an electric power output of the cycle of 3.8 kW will be possible, which results in a cycle efficiency of about 6.5 \% and an increase of the electrical power output of the CHP plant of about 10 \%. The results show that the plant concept is technically feasible and, with further optimization, also represents an alternative to ORC plants in terms of increasing the efficiency of a cogeneration plant.}, language = {en} } @article{FuchsHofzumahausRohreretal.2013, author = {Fuchs, H. and Hofzumahaus, A. and Rohrer, F. and Bohn, Birger and Brauers, Theo and Dorn, Hans-Peter and H{\"a}seler, R. and Holland, F. and Kaminski, M. and Li, X. and Lu, K. and Nehr, Sascha and Tillmann, R. and Wegener, R. and Wahner, A.}, title = {Experimental evidence for efficient hydroxyl radical regeneration in isoprene oxidation}, series = {Nature Geoscience}, volume = {6}, journal = {Nature Geoscience}, number = {12}, publisher = {Springer Nature}, issn = {1752-0894}, doi = {10.1038/NGEO1964}, pages = {1023 -- 1026}, year = {2013}, language = {en} } @article{SulaimanSaberHasanetal.2025, author = {Sulaiman, Mohammed A. and Saber, Hindren Ali and Hasan, Hasan F. and Benim, Ali Cemal}, title = {Experimental and numerical investigation of novel dew-point evaporative cooler with shell and tube design}, series = {Energy}, volume = {317}, journal = {Energy}, publisher = {Elsevier}, issn = {0360-5442}, doi = {10.1016/j.energy.2025.134686}, year = {2025}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @unpublished{SulaimanSaberHasanetal.2024, author = {Sulaiman, Mohammed Abdulqader and Saber, Hindren Ali and Hasan, Hasan Fahmi and Benim, Ali Cemal}, title = {Experimental and Numerical Investigation of Novel Dew-Point Evaporative Cooler with Shell and Tube Design}, series = {SSRN}, journal = {SSRN}, publisher = {Elsevier}, doi = {10.2139/ssrn.4980477}, pages = {38}, year = {2024}, abstract = {Implementing a neoteric practical design for dew-point evaporative cooler (DPEC) rather than the widely utilized flat plate and corrugated plate has been challenging since the first invention. Thus far, no study has been dedicated to design and experimentally implement a shell and tube concept for DPEC with an innovative configuration that can contribute in mass production, globalization, and effortless maintenance of such a high performance cooling machine. Therefore, in this paper, the shell and tube concept has been employed as a core design for DPEC that has been reinforced by a practical approaches. The practical approaches include a dedicated novel design for the proposed system and utilizing super cheap materials for the system's construction. Both of the aforementioned approaches provide solutions for overcoming the aforementioned issues. In the meanwhile, the superiority of the proposed DPEC has been approved by comparing it to the flat plate DPEC. During the experimentations, the prototype was able to reduce the ambient temperature by up to 34.1°C (from 53°C to 18.9°C), besides, it could achieve a dew-point effectiveness of 99.6\% and wet-bulb effectiveness of 135\%.}, subject = {Numerische Str{\"o}mungssimulation}, language = {en} } @article{BenimEscudierNahavandietal.2010, author = {Benim, Ali Cemal and Escudier, Marcel and Nahavandi, Ali and Nickson, A. K. and Syed, Khawar J. and Joos, Franz}, title = {Experimental and numerical investigation of isothermal flow in an idealized swirl combustor}, series = {International Journal of Numerical Methods for Heat \& Fluid Flow}, volume = {20}, journal = {International Journal of Numerical Methods for Heat \& Fluid Flow}, number = {3}, publisher = {Emerald}, doi = {10.1108/09615531011024084}, pages = {348 -- 370}, year = {2010}, language = {en} } @article{IqbalBenimFischeretal.2016, author = {Iqbal, Sohail and Benim, Ali Cemal and Fischer, S. and Joos, F. and Kluβ, D. and Wiedermann, Alexander}, title = {Experimental and numerical analysis of natural bio and syngas swirl flames in a model gas turbine combustor}, series = {Journal of Thermal Science}, volume = {25}, journal = {Journal of Thermal Science}, number = {5}, publisher = {Springer}, doi = {10.1007/s11630-016-0885-4}, pages = {460 -- 469}, year = {2016}, language = {en} } @article{MinartzVondebergObertetal.2025, author = {Minartz, Peter and Vondeberg, Carmen and Obert, Laura and Bleck, Christian and Hemming, Bernhard and V{\"o}cking, Mara and Ose, Claudia and Znotka, Matti and C{\"u}rlis, Diana and Karrenbrock, Anne and Oehmichen, Frank and Heistermann, Peter and Kuske, Silke}, title = {Experiencing digital technologies: The importance of feeling safe in healthcare - A qualitative participatory design}, series = {Das Gesundheitswesen}, journal = {Das Gesundheitswesen}, publisher = {Thieme}, issn = {0941-3790}, doi = {10.1055/a-2560-1100}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-52945}, pages = {13}, year = {2025}, abstract = {Background Digital technologies are increasingly used in healthcare. In this context, perceived safety plays a critical role in their acceptance and implementation. Previous research had focused more on data security or specific digital technologies. There has also been a lack of participatory approaches to consider and empower healthcare recipients (and relatives), providers, and technology experts to broaden the phenomenon. Objective The aim of this study was to present a comprehensive perspective on the needs, influencing factors and related outcomes in the context of feeling safe with digital technologies in healthcare. Method A qualitative, exploratory, and participatory methodology was used with five guide-based focus group workshops. Each workshop explored one of five digital technology demonstrations provided at the beginning: (1) electronic health records (EHR), (2) robotics, (3) artificial intelligence (AI), (4) smart home, and (5) smart hospital. All participants were invited for a guide-based discussion. The study focused on the levels of 'involvement' and 'collaboration' by also empowering participation. The workshop target groups were actively involved in the development and execution of the workshops and were empowered. The data were analysed via a content analysis approach, with a mostly inductive procedure. Results Feeling safe was found to affect thoughts, emotions, and actions. For example, a higher level of perceived safety increased the acceptance of digital technologies, whereas a lower level of perceived safety decreased it. The corresponding needs and influencing factors differed in terms of their scope and focus depending on the context. The aspect of 'control' was most frequently addressed by all the target groups and was viewed as relevant in all the workshops. In general, digital technologies were viewed as supplements rather than substitutes for healthcare providers. Conclusion This study extends beyond the current state of research on perceived safety and the use of digital technologies in healthcare by providing a comprehensive overview of the corresponding needs and influencing factors at various levels, such as the individual, community-organizational, and system-society levels. The perceived safety of healthcare recipients and providers related to digital technologies should be taken into consideration to achieve positive implementation outcomes.}, subject = {Digitalisierung}, language = {en} } @article{MuellerBraunKeuper2025, author = {M{\"u}ller, Patrick and Braun, Alexander and Keuper, Margret}, title = {Examining the Impact of Optical Aberrations to Image Classification and Object Detection Models}, series = {IEEE Transactions on Pattern Analysis and Machine Intelligence}, journal = {IEEE Transactions on Pattern Analysis and Machine Intelligence}, publisher = {IEEE}, issn = {0162-8828}, doi = {10.1109/TPAMI.2025.3622234}, pages = {1 -- 15}, year = {2025}, language = {en} } @inproceedings{WeberThielkeFischer2019, author = {Weber, Konradin and Thielke, Jan and Fischer, Christian}, title = {Evaluation of selected physical parameters measured with smartphones}, series = {Verhandlungen der Deutschen Physikalische Gesellschaft e.V.}, booktitle = {Verhandlungen der Deutschen Physikalische Gesellschaft e.V.}, publisher = {Deutsche Physikalische Gesellschaft e.V.}, address = {Bad Honnef}, year = {2019}, subject = {Messtechnik}, language = {en} } @article{NovelliKaminskiRolletteretal.2018, author = {Novelli, Anna and Kaminski, Martin and Rolletter, Michael and Acir, Ismail-Hakki and Bohn, Birger and Dorn, Hans-Peter and Li, Xin and Lutz, Anna and Nehr, Sascha and Rohrer, Franz and Tillmann, Ralf and Wegener, Robert and Holland, Frank and Hofzumahaus, Andreas and Kiendler-Scharr, Astrid and Wahner, Andreas and Fuchs, Hendrik}, title = {Evaluation of OH and HO2 concentrations and their budgets during photooxidation of 2-methyl-3-butene-2-ol (MBO) in the atmospheric simulation chamber SAPHIR}, series = {Atmospheric Chemistry and Physics}, volume = {18}, journal = {Atmospheric Chemistry and Physics}, number = {15}, publisher = {Copernicus}, issn = {1680-7324}, doi = {10.5194/acp-18-11409-2018}, pages = {11409 -- 11422}, year = {2018}, abstract = {Several previous field studies have reported unexpectedly large concentrations of hydroxyl and hydroperoxyl radicals (OH and HO2, respectively) in forested environments that could not be explained by the traditional oxidation mechanisms that largely underestimated the observations. These environments were characterized by large concentrations of biogenic volatile organic compounds (BVOC) and low nitrogen oxide concentration. In isoprene-dominated environments, models developed to simulate atmospheric photochemistry generally underestimated the observed OH radical concentrations. In contrast, HO2 radical concentration showed large discrepancies with model simulations mainly in non-isoprene-dominated forested environments. An abundant BVOC emitted by lodgepole and ponderosa pines is 2-methyl-3-butene-2-ol (MBO), observed in large concentrations for studies where the HO2 concentration was poorly described by model simulations. In this work, the photooxidation of MBO by OH was investigated for NO concentrations lower than 200 pptv in the atmospheric simulation chamber SAPHIR at Forschungszentrum J{\"u}lich. Measurements of OH and HO2 radicals, OH reactivity (kOH), MBO, OH precursors, and organic products (acetone and formaldehyde) were used to test our current understanding of the OH-oxidation mechanisms for MBO by comparing measurements with model calculations. All the measured trace gases agreed well with the model results (within 15 \%) indicating a well understood mechanism for the MBO oxidation by OH. Therefore, the oxidation of MBO cannot contribute to reconciling the unexplained high OH and HO2 radical concentrations found in previous field studies.}, language = {en} } @article{NeefFritzenSchumacher2003, author = {Neef, Matthias and Fritzen, J. P. and Schumacher, G.}, title = {Evaluation of mount loads in dynamic testing of a jet engine}, series = {Mechanical Systems and Signal Processing}, volume = {17}, journal = {Mechanical Systems and Signal Processing}, number = {3}, publisher = {Elsevier}, doi = {10.1006/mssp.2001.1405}, pages = {665 -- 681}, year = {2003}, abstract = {In the dynamic testing of jet engines the evaluation of loads on the mount structure is vital for comparison with finite element calculations of such testing. Measuring these loads with the help of strain gauges applied to the structure becomes difficult if the mount is overdetermined and thus not every strain gauge can be assigned to a single load direction. In this study, the overdetermined mount structure of the BR715 engine was examined at one of the three mounting points between the Boeing 717 airframe and the engine, where loads in five directions were reacted. Firstly, the dependence of five measured strains upon known static load conditions at the mounting point had to be determined. For this purpose a static calibration test was carried out where defined forces and moments in known directions were applied to the structure while the output from five strain gauges was measured accordingly. The result was the desired relationship between loads and strains in terms of a matrix, which yields the corresponding load condition of the examined mounting point if multiplied with a set of strains. The same calibration procedure was carried out with a finite element model of the mount, where direct comparison to dynamic load results from the model itself was possible. With this model the validity of the above method was shown as well as possible errors which may occur while evaluating dynamic test results. The method was found to give satisfactory results even for dynamic loading, although some inertia forces disturb the signals in dynamic testing. Finally, the results from an actual dynamic engine test were processed into loads and then compared to the simulated loads from a finite element model of the engine. Good agreement was found and the indication of any remaining discrepancies was used to update the model for an even better representation of the dynamic test loads.}, language = {en} } @inproceedings{WeberKramerFischeretal.2019, author = {Weber, Konradin and Kramer, Tim and Fischer, Christian and Pohl, Tobias and B{\"o}hlke, Christoph}, title = {Evaluation of low cost and mid cost sensors for fine particulate matter at urban sites}, series = {Geophysical Research Abstracts: EGU General Assembly 2019}, volume = {21}, booktitle = {Geophysical Research Abstracts: EGU General Assembly 2019}, publisher = {Copernicus}, address = {G{\"o}ttingen}, year = {2019}, abstract = {High ambient air concentrations of fine particulate matter are a problem in many European cities, especially in traffic loaded street canyons. Therefore, the introduction of traffic restricted or traffic reduced areas is discussed as a countermeasure in several towns. However, at that point it is not always clear, in what extent the restriction of traffic in presently overloaded streets causes the exceeding of limit values in other areas of the town after the redirection of the traffic. Presently this cannot be recorded appropriately, when the concentrations of fine particulate matter are monitored only at rarely distributed single points by the official measurement systems of the environmental state agencies. On the other hand, meanwhile there are low cost and mid cost sensors for the measurement of fine particulate matter available, which enable the parallel monitoring with many measurement systems in an extended area of the town. By this way, the effect of traffic restrictions on the distribution of fine particulate matter in the city can potentially be observed. However, at this point the question arises, how reliable the results are, which are delivered by the low and mid cost sensors for fine particulate matter. For this reason different low cost and mid cost sensors have been evaluated for this study and intercompared with certified reference measurement systems for fine particulate matter. The study comprised the sensors SDS011 (Nova Fitness), which is in use already for several citizen science projects in Germany, SPS30 (Sensirion), OPC-R1 (Alphasense), OPC-N2 (Alphasense) and OPC-N3 (Alphasense). This study was performed at urban sites in D{\"u}sseldorf (Germany) for several weeks and covered different traffic loads and different meteorological situations, in order to get representative results. As atmospheric humidity can influence the measurement results, the humidity was measured in parallel to the fine particulate matter. It could be shown that the validity of the measurement results of fine particulate matter could be improved, when the parallel readings of the humidity were taken into account.}, subject = {Messtechnik}, language = {en} } @inproceedings{KerstenHaaseRiess2025, author = {Kersten, Thierry and Haase, Thomas and Riess, Bernhard M.}, title = {Evaluation of a new AI driven SoC Design Flow Approach}, series = {MPC-Workshop Januar 2024 / Januar 2025}, volume = {67/68}, booktitle = {MPC-Workshop Januar 2024 / Januar 2025}, editor = {Schmidt, Lothar}, publisher = {Technische Hochschule Ulm}, address = {Ulm}, organization = {Multi Projekt Chip Gruppe}, issn = {1868-9221}, pages = {47 -- 57}, year = {2025}, subject = {K{\"u}nstliche Intelligenz}, language = {en} } @inproceedings{HuesenvonBergSteffens2025, author = {H{\"u}sen, Jonas and von Berg, Markus and Steffens, Jochen}, title = {Evaluating the Effectiveness of Virtual Listening Tests for Balanced Armature Headphone Drivers [Abstract]}, series = {DAS|DAGA 2025: 51st Annual Meeting on Acoustics, March 17-20, 2025, Copenhagen}, booktitle = {DAS|DAGA 2025: 51st Annual Meeting on Acoustics, March 17-20, 2025, Copenhagen}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik e.V.}, address = {Berlin}, year = {2025}, subject = {Kopfh{\"o}rer}, language = {en} } @inproceedings{HuesenvonBergSteffens2025, author = {H{\"u}sen, Jonsa and von Berg, Markus and Steffens, Jochen}, title = {Evaluating the Effectiveness of Virtual Listening Tests for Balanced Armature Headphone Drivers}, series = {AES International Conference on Headphone Technology 2025 August 27-29, Espoo, Finland}, booktitle = {AES International Conference on Headphone Technology 2025 August 27-29, Espoo, Finland}, number = {3}, publisher = {Audio Engineering Society}, year = {2025}, language = {en} } @inproceedings{NeefHummel2000, author = {Neef, Matthias and Hummel, Dietrich}, title = {Euler solutions for a finite-span flapping wing}, series = {"Fixed, flapping and rotary wing vehicles at very low Reynolds numbers, Notre Dame, Indiana, USA}, booktitle = {"Fixed, flapping and rotary wing vehicles at very low Reynolds numbers, Notre Dame, Indiana, USA}, year = {2000}, language = {en} }