TY - JOUR A1 - Fuchs, H. A1 - Hofzumahaus, A. A1 - Rohrer, F. A1 - Bohn, Birger A1 - Brauers, Theo A1 - Dorn, Hans-Peter A1 - Häseler, R. A1 - Holland, F. A1 - Kaminski, M. A1 - Li, X. A1 - Lu, K. A1 - Nehr, Sascha A1 - Tillmann, R. A1 - Wegener, R. A1 - Wahner, A. T1 - Experimental evidence for efficient hydroxyl radical regeneration in isoprene oxidation JF - Nature Geoscience KW - Luftreinhaltung Y1 - 2013 U6 - https://doi.org/10.1038/NGEO1964 SN - 1752-0894 VL - 6 IS - 12 SP - 1023 EP - 1026 PB - Springer Nature ER - TY - JOUR A1 - Sulaiman, Mohammed A. A1 - Saber, Hindren Ali A1 - Hasan, Hasan F. A1 - Benim, Ali Cemal T1 - Experimental and numerical investigation of novel dew-point evaporative cooler with shell and tube design JF - Energy KW - Numerische Strömungssimulation KW - Kühlung Y1 - 2025 U6 - https://doi.org/10.1016/j.energy.2025.134686 SN - 0360-5442 VL - 317 PB - Elsevier ER - TY - INPR A1 - Sulaiman, Mohammed Abdulqader A1 - Saber, Hindren Ali A1 - Hasan, Hasan Fahmi A1 - Benim, Ali Cemal T1 - Experimental and Numerical Investigation of Novel Dew-Point Evaporative Cooler with Shell and Tube Design T2 - SSRN N2 - 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%. KW - Dew-point evaporative cooler KW - Tubular Maisotsenko cycle KW - Shell and tube design KW - Heat and mass diffusion KW - Numerische Strömungssimulation KW - Verdunstungskühlung Y1 - 2024 U6 - https://doi.org/10.2139/ssrn.4980477 PB - Elsevier ER - TY - JOUR A1 - Benim, Ali Cemal A1 - Escudier, Marcel A1 - Nahavandi, Ali A1 - Nickson, A. K. A1 - Syed, Khawar J. A1 - Joos, Franz T1 - Experimental and numerical investigation of isothermal flow in an idealized swirl combustor JF - International Journal of Numerical Methods for Heat & Fluid Flow Y1 - 2010 U6 - https://doi.org/10.1108/09615531011024084 VL - 20 IS - 3 SP - 348 EP - 370 PB - Emerald ER - TY - JOUR A1 - Iqbal, Sohail A1 - Benim, Ali Cemal A1 - Fischer, S. A1 - Joos, F. A1 - Kluβ, D. A1 - Wiedermann, Alexander T1 - Experimental and numerical analysis of natural bio and syngas swirl flames in a model gas turbine combustor JF - Journal of Thermal Science Y1 - 2016 U6 - https://doi.org/10.1007/s11630-016-0885-4 VL - 25 IS - 5 SP - 460 EP - 469 PB - Springer ER - TY - JOUR A1 - Minartz, Peter A1 - Vondeberg, Carmen A1 - Obert, Laura A1 - Bleck, Christian A1 - Hemming, Bernhard A1 - Vöcking, Mara A1 - Ose, Claudia A1 - Znotka, Matti A1 - Cürlis, Diana A1 - Karrenbrock, Anne A1 - Oehmichen, Frank A1 - Heistermann, Peter A1 - Kuske, Silke T1 - Experiencing digital technologies: The importance of feeling safe in healthcare – A qualitative participatory design JF - Das Gesundheitswesen N2 - 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. N2 - Hintergrund Digitale Technologien werden im Gesundheitswesen immer häufiger eingesetzt. Hierbei spielt die wahrgenommene Sicherheit eine entscheidende Rolle für deren Implementierung. Bisherige Forschung konzentrierte sich eher auf die Datensicherheit oder auf spezifische digitale Technologien. Es fehlte ein partizipativer Ansatz, der es Leistungsempfangenden (deren Angehörigen), Leistungserbringenden und Technologieexpert:innen ermöglichte, die Sicht auf das Phänomen zu erweitern. Ziel Ziel war es daher erfahrungsbasiert Bedürfnisse, Einflussfaktoren und damit verbundenen Outcomes im Kontext des Sicherheitsgefühls digitaler Technologien im Gesundheitswesen zu erforschen. Methode Es wurde ein qualitatives, exploratives und partizipatives Design, basierend auf fünf leitfadengestützten Fokus-Gruppenworkshops durchgeführt. Eine von fünf digitalen Technologien ((1) elektronische Gesundheitsakten (EHR), (2) Robotik, (3) künstliche Intelligenz (AI), (4) Smart Home und (5) Smart Hospital), wurde zu Beginn oder während des Workshops vorgestellt und/oder konnte ausprobiert werden. Alle Teilnehmenden wurden zu einer leitfadengestützten Diskussion eingeladen. Die Partizipation wurde auf den Ebenen der „Beteiligung“ und „Zusammenarbeit“ gefördert, indem aktiv in die Entwicklung und Durchführung der Workshops einbezogen sowie zur Teilnahme befähigt wurde. Die Daten wurden mit Hilfe induktiver Inhaltsanalyse ausgewertet. Ergebnisse Das Gefühl der Sicherheit beeinflusst Gedanken, Gefühle und Handlungen. Beispielsweise kann ein höheres Maß an gefühlter Sicherheit die Akzeptanz digitaler Technologien erhöhen, während ein niedrigeres Maß diese verringern kann. Entsprechende Bedürfnisse und Einflussfaktoren unterschieden sich je nach Kontext in ihrem Umfang und Schwerpunkt. Der Aspekt der „Kontrolle“ wurde von allen Zielgruppen am häufigsten angesprochen und in allen Workshops als relevant angesehen. Digitale Technologien wurden eher als Ergänzung, denn als ein Ersatz für Leistungserbringende betrachtet. Schlussfolgerung Diese Studie geht über den aktuellen Stand der Forschung im Kontext wahrgenommener Sicherheit und digitaler Technologien im Gesundheitswesen hinaus, indem sie einen umfassenden Überblick über die Bedürfnisse und Einflussfaktoren von der individuellen bis hin zur System-/Gesellschaftsebene gibt. Die gefühlte Sicherheit sollte grundsätzlich berücksichtigt werden, um die Implementierung digitaler Technologien zu fördern. KW - Digitalisierung KW - FBSK_Webseite KW - Gesundheitswesen KW - Robotik KW - Künstliche Intelligenz KW - Subjektive Sicherheit Y1 - 2025 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-52945 SN - 0941-3790 PB - Thieme ER - TY - JOUR A1 - Müller, Patrick A1 - Braun, Alexander A1 - Keuper, Margret T1 - Examining the Impact of Optical Aberrations to Image Classification and Object Detection Models JF - IEEE Transactions on Pattern Analysis and Machine Intelligence KW - Optical imaging KW - Lenses KW - Robustness KW - Kernel KW - Optical sensors Y1 - 2025 U6 - https://doi.org/10.1109/TPAMI.2025.3622234 SN - 0162-8828 SP - 1 EP - 15 PB - IEEE ER - TY - CHAP A1 - Weber, Konradin A1 - Thielke, Jan A1 - Fischer, Christian T1 - Evaluation of selected physical parameters measured with smartphones T2 - Verhandlungen der Deutschen Physikalische Gesellschaft e.V. KW - Messtechnik KW - Smartphone KW - Luftreinhaltung Y1 - 2019 UR - https://web.archive.org/web/20250313105536/https://www.dpg-verhandlungen.de/year/2019/conference/aachen/part/dd/session/2/contribution/46 N1 - Posterabstract PB - Deutsche Physikalische Gesellschaft e.V. CY - Bad Honnef ER - TY - JOUR A1 - Novelli, Anna A1 - Kaminski, Martin A1 - Rolletter, Michael A1 - Acir, Ismail-Hakki A1 - Bohn, Birger A1 - Dorn, Hans-Peter A1 - Li, Xin A1 - Lutz, Anna A1 - Nehr, Sascha A1 - Rohrer, Franz A1 - Tillmann, Ralf A1 - Wegener, Robert A1 - Holland, Frank A1 - Hofzumahaus, Andreas A1 - Kiendler-Scharr, Astrid A1 - Wahner, Andreas A1 - Fuchs, Hendrik T1 - 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 JF - Atmospheric Chemistry and Physics N2 - 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 Jülich. 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. KW - Luftreinhaltung Y1 - 2018 U6 - https://doi.org/10.5194/acp-18-11409-2018 SN - 1680-7324 N1 - Code and data availability The data from the experiments in the SAPHIR chamber used in this work are available on the EUROCHAMP data home page (https://data.eurochamp.org/, last access: 1 October 2019, EUROCHAMP, 2019). Supplement The supplement related to this article is available online at: https://doi.org/10.5194/acp-20-3333-2020-supplement. VL - 18 IS - 15 SP - 11409 EP - 11422 PB - Copernicus ER - TY - JOUR A1 - Neef, Matthias A1 - Fritzen, J. P. A1 - Schumacher, G. T1 - Evaluation of mount loads in dynamic testing of a jet engine JF - Mechanical Systems and Signal Processing N2 - 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. Y1 - 2003 UR - http://www.sciencedirect.com/science/article/pii/S0888327001914050 U6 - https://doi.org/10.1006/mssp.2001.1405 VL - 17 IS - 3 SP - 665 EP - 681 PB - Elsevier ER - TY - CHAP A1 - Weber, Konradin A1 - Kramer, Tim A1 - Fischer, Christian A1 - Pohl, Tobias A1 - Böhlke, Christoph T1 - Evaluation of low cost and mid cost sensors for fine particulate matter at urban sites T2 - Geophysical Research Abstracts: EGU General Assembly 2019 N2 - 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 Düsseldorf (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. KW - Luftreinhaltung KW - Messtechnik KW - Sensor KW - Feinstaub Y1 - 2019 UR - https://web.archive.org/web/20240421022835/https://meetingorganizer.copernicus.org/EGU2019/EGU2019-15021.pdf N1 - Vortragsabstract VL - 21 PB - Copernicus CY - Göttingen ER - TY - CHAP A1 - Kersten, Thierry A1 - Haase, Thomas A1 - Riess, Bernhard M. ED - Schmidt, Lothar T1 - Evaluation of a new AI driven SoC Design Flow Approach T2 - MPC-Workshop Januar 2024 / Januar 2025 KW - Künstliche Intelligenz KW - Maschinelles Lernen KW - System-on-Chip KW - Design Y1 - 2025 UR - https://www.mpc-gruppe.de/typo8/fileadmin/content/workshops-volums/MPC_068_02_Kersten_Haase_Riess.pdf UR - https://www.mpc-gruppe.de/typo8/fileadmin/content/workshops-volums/MPC_067_068.pdf UR - https://nbn-resolving.org/urn:nbn:de:bsz:ofb1-opus4-110259 SN - 1868-9221 VL - 67/68 SP - 47 EP - 57 PB - Technische Hochschule Ulm CY - Ulm ER - TY - CHAP A1 - Hüsen, Jonas A1 - von Berg, Markus A1 - Steffens, Jochen T1 - Evaluating the Effectiveness of Virtual Listening Tests for Balanced Armature Headphone Drivers [Abstract] T2 - DAS|DAGA 2025: 51st Annual Meeting on Acoustics, March 17-20, 2025, Copenhagen KW - Kopfhörer KW - Treiberschaltung KW - Evaluation Y1 - 2025 UR - https://pub.dega-akustik.de/DAS-DAGA_2025/konferenz-1498.html?article=351 PB - Deutsche Gesellschaft für Akustik e.V. CY - Berlin ER - TY - CHAP A1 - Hüsen, Jonsa A1 - von Berg, Markus A1 - Steffens, Jochen T1 - Evaluating the Effectiveness of Virtual Listening Tests for Balanced Armature Headphone Drivers T2 - AES International Conference on Headphone Technology 2025 August 27–29, Espoo, Finland Y1 - 2025 UR - https://aes.org/publications/elibrary-page/?id=22929 IS - 3 PB - Audio Engineering Society ER - TY - CHAP A1 - Neef, Matthias A1 - Hummel, Dietrich T1 - Euler solutions for a finite-span flapping wing T2 - "Fixed, flapping and rotary wing vehicles at very low Reynolds numbers, Notre Dame, Indiana, USA Y1 - 2000 ER - TY - CHAP A1 - Neef, Matthias A1 - Hummel, Dietrich ED - Mueller, Thomas J. T1 - Euler Solutions for a Finite-Span Flapping Wing T2 - Fixed and Flapping Wing Aerodynamics for Micro Air Vehicle Applications Y1 - 2001 SN - 978-1-56347-517-7 U6 - https://doi.org/10.2514/5.9781600866654.0429.0451 VL - 16 SP - 429 EP - 451 PB - American Institute of Aeronautics and Astronautics CY - Reston, VA ER - TY - CHAP A1 - Neef, Matthias A1 - Hummel, D. ED - Krause, Egon ED - Jäger, Willi T1 - Euler and Navier-Stokes Solutions for Flapping Wing Propulsion T2 - High Performance Computing in Science and Engineering ’01 KW - Wing Motion KW - Computational Fluid Dynamics KW - High Performance Computing KW - Thrust Coefficient Y1 - 2002 SN - 978-3-642-62719-4 U6 - https://doi.org/10.1007/978-3-642-56034-7_37 VL - 30 SP - 386 EP - 395 PB - Springer CY - Berlin ER - TY - JOUR A1 - Greil, Stefan A1 - Schwarz, Christian A1 - Stein, Stefan T1 - ESG Value Creation from a Transfer Pricing Perspective JF - International Transfer Pricing Journal N2 - Achieving environmental, social and governance (ESG) targets has become one of the most important challenges for multinational enterprises (MNEs). However, ESG initiatives have received rather little attention so far from a transfer pricing perspective. This article explores how ESG initiatives can alter the existing value creation within MNEs from a transfer pricing perspective. KW - Environmental, Social and Governance KW - Multinationales Unternehmen KW - Wertschöpfung KW - Verrechnungspreis Y1 - 2023 U6 - https://doi.org/10.59403/csvtb1 SN - 2352-9172 VL - 30 IS - 2 PB - International Bureau of Fiscal Documentation ER - TY - JOUR A1 - Çiçek, Aydın A1 - Koçyiğit, Ali T1 - Episodic evolution and active tectonics of the Karamık Graben in the apex of Isparta Angle, SW Türkiye JF - Mediterranean Geoscience Reviews KW - Neotektonik KW - Verwerfung KW - Kurve von Isparta KW - Karamık Graben KW - Anatolien Y1 - 2025 U6 - https://doi.org/10.1007/s42990-024-00151-5 SN - 2661-863X PB - Springer Nature ER - TY - CHAP A1 - Herder, Jens A1 - Cohen, Michael ED - Gorayska, Barbara ED - Nehaniv, Chrystopher L. ED - Marsh, Jonathon P. T1 - Enhancing Perspicuity of Objects in Virtual Reality Environments T2 - Proceedings, Second International Conference on Cognitive Technology N2 - In an information-rich Virtual Reality (VR) environment, the user is immersed in a world containing many objects providing that information. Given the finite computational resources of any computer system, optimization is required to ensure that the most important information is presented to the user as clearly as possible and in a timely fashion. In particular, what is desired are means whereby the perspicuity of an object may be enhanced when appropriate. An object becomes more perspicuous when the information it provides to the user becomes more readily apparent. Additionally, if a particular object provides high-priority information, it would be advantageous to make that object obtrusive as well as highly perspicuous. An object becomes more obtrusive if it draws attention to itself (or equivalently, if it is hard to ignore). This paper describes a technique whereby objects may dynamically adapt their representation in a user's environment according to a dynamic priority evaluation of the information each object provides. The three components of our approach are: - an information manager that evaluates object information priority, - an enhancement manager that tabulates rendering features associated with increasing object perspicuity and obtrusion as a function of priority, and - a resource manager that assigns available object rendering resources according to features indicated by the enhancement manager for the priority set for each object by the information manager. We consider resources like visual space (pixels), sound spatialization channels (mixels), MIDI/audio channels, and processing power, and discuss our approach applied to different applications. Assigned object rendering features are implemented locally at the object level (e.g., object facing the user using the billboard node in VRML 2.0) or globally, using helper applications (e.g., active spotlights, semi-automatic cameras). KW - autonomous actors KW - obtrusion KW - perspicuity KW - spatial media KW - spatialization KW - user interface design man-machine interfaces KW - Virtual Reality Y1 - 1997 SN - 0-8186-8084-9 SP - 228 EP - 237 PB - IEEE CY - Los Alamitos ER -