@inproceedings{vonBergSchwoererPrinzetal.2023, author = {von Berg, Markus and Schw{\"o}rer, Paul and Prinz, Lukas and Steffens, Jochen}, title = {Analysis of physical and perceptual properties of room impulse responses: development of an online tool}, series = {Forum Acusticuum 2023: 10th Convention of European Acoustics Association, Turin, Italy, 11th-15th September 2023}, booktitle = {Forum Acusticuum 2023: 10th Convention of European Acoustics Association, Turin, Italy, 11th-15th September 2023}, publisher = {EAA}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-41955}, pages = {8}, year = {2023}, abstract = {Over the past decades, research in room acoustics has established several derivative measures of an impulse response, some of which are incorporated in the ISO 3382 standards. These parameters intend to represent perceptual qualities, but were developed without a consistent modeling of room acoustical perception. More recent research proposed comprehensive inventories of room acoustic perception that are purely based on evaluations by human subjects, such as the Room Acoustical Quality Index (RAQI). In this work RA-QI scores acquired for 70 room impulse responses were predicted from room acoustical parameters. Except for Reverberance, the prediction of RAQI factors performed rather poor. In most cases, the sound source had a greater impact on RAQI scores. All analyses are published in an online tool, where users can upload omnidirectional and binaural impulse responses, and instantly obtain and visualize several physical descriptors, as well as predicted RAQI scores for three different sound sources. So far, acceptable prediction accuracy is achieved for Reverberance, Strength, Irregular Decay, Clarity and Intimacy. Larger data sets of evaluated impulse responses are required to improve the model performance and enable reliable predictions of room acoustical quality. Therefore, the administration of RAQI evaluations within the website is currently being developed.}, language = {en} } @article{FailingKaluzaStrucks2023, author = {Failing, Luisa and Kaluza, Stefan and Strucks, Peter}, title = {Catalytic CO2 methanation: Providing optimal test conditions for kinetic investigations}, series = {Chemie Ingenieur Technik}, volume = {95}, journal = {Chemie Ingenieur Technik}, number = {5}, publisher = {Wiley}, issn = {1522-2640}, doi = {10.1002/cite.202200201}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-40026}, pages = {749 -- 753}, year = {2023}, abstract = {In the context of using renewable energies and recycling climate-changing gases, methanation of CO2 provides one possibility. However, volatile availability of renewable energies for hydrogen production and fluctuating CO2streams from different sources lead to enhanced demand in investigating the influence of dynamic process operation on the catalyst performance, including detailed kinetic characterization. Reliable kinetic measurements require isothermal temperature control and absence of macrokinetic diffusion limitations. Both were investigated in this work while the determination of steady-state kinetic parameters is part of ongoing studies. Furthermore, a detailed analysis with respect to the long-term-stability of the nickel-based catalyst was performed}, language = {en} } @inproceedings{StoehrZielke2023, author = {St{\"o}hr, Marcel and Zielke, Thomas}, title = {Machine Learning for Soft Sensors and an Application in Cement Production}, series = {Smart, Sustainable Manufacturing in an Ever-Changing World Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, volume = {Lecture Notes in Production Engineering}, booktitle = {Smart, Sustainable Manufacturing in an Ever-Changing World Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, editor = {Leipzig, Konrad von and Sacks, Natasha and Mc Clelland, Michelle}, publisher = {Springer Nature Switzerland}, address = {Cham}, isbn = {978-3-031-15604-5}, doi = {10.1007/978-3-031-15602-1_46}, pages = {627 -- 638}, year = {2023}, language = {en} } @inproceedings{TischbeinFatemiWirtzetal.2023, author = {Tischbein, Franziska and Fatemi, Armin and Wirtz, Frank and Schmoger, Christin and Dorendorf, Stefan and Schurtz, Annika and Echternacht, David and Ulbig, Andreas}, title = {Development of Strategies for the Smartification of Low-Voltage Grids}, series = {ETG-Fb. 170: ETG Kongress 2023 : Die Energiewende beschleunigen, 25. - 26.05.2023 in Kasse}, volume = {ETG-Fachberichte 170}, booktitle = {ETG-Fb. 170: ETG Kongress 2023 : Die Energiewende beschleunigen, 25. - 26.05.2023 in Kasse}, publisher = {VDE}, address = {Berlin}, isbn = {978-3-8007-6108-1}, pages = {438 -- 444}, year = {2023}, language = {en} } @inproceedings{FatemiTischbeinWirtzetal.2023, author = {Fatemi, Armin and Tischbein, Franziska and Wirtz, Frank and Schmoger, Christin and Dorendorf, Stefan and Schurtz, Annika and Echternacht, David and Ulbig, Andreas}, title = {On the Impact of Smartification Strategies for the State Estimation of Low Voltage Grids}, series = {13th "Internationale Energiewirtschaftstagung" (IEWT2023), February 15-17, 2023, Vienna, Austria}, booktitle = {13th "Internationale Energiewirtschaftstagung" (IEWT2023), February 15-17, 2023, Vienna, Austria}, publisher = {arXiv}, address = {Wien}, doi = {10.48550/arXiv.2303.07964}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-41282}, pages = {1 -- 15}, year = {2023}, abstract = {The decarbonization of for example the energy or heat sector leads to the transformation of distribution grids. The expansion of decentralized energy resources and the integration of new consumers due to sector coupling (e.g. heat pumps or electric vehicles) into low voltage grids increases the need for grid expansion and usage of flexibilities in the grid. A high observability of the current grid status is needed to perform these tasks efficiently and effectively. Therefore, there is a need to increase the observability of low voltage grids by installing measurement technologies (e.g. smart meters). Multiple different measurement technologies are available for low voltage grids which can vary in their benefit to observation quality and their installation costs. Therefore, Bayernwerk Netz GmbH and E.DIS AG in cooperation with E-Bridge Consulting GmbH and the Institute for High Voltage Equipment and Grids, Digitalization and Energy Economics (IAEW) investigated the effectiveness of different strategies for the smartification of low voltage grids. This paper presents the methodology used for the investigation and exemplary results focusing on the impact of intelligent cable distribution cabinets and smart meters on the quality of the state estimation.}, language = {en} } @misc{DeckertLauermann2023, author = {Deckert, Carsten and Lauermann, Paul}, title = {Warum ist es am Rhein so sch{\"o}n? Strategische Ausrichtung des Binnenhafens Bonn}, address = {D{\"u}sseldorf}, organization = {Hochschule D{\"u}sseldorf}, doi = {10.20385/opus4-4112}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-41121}, pages = {14}, year = {2023}, language = {de} } @misc{Deckert2023, author = {Deckert, Carsten}, title = {Now What You Hear Is Not a Test: The Invention and Commercialization of Rap Music}, address = {D{\"u}sseldorf}, organization = {Hochschule D{\"u}sseldorf}, doi = {10.20385/opus4-4113}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-41134}, pages = {14}, year = {2023}, language = {en} } @misc{DeckertPhanNgoc2023, author = {Deckert, Carsten and Phan Ngoc, Duc Anh}, title = {PlayStation 4 vs. Xbox One: Competitive Analysis of the Video Game Industry}, address = {D{\"u}sseldorf}, organization = {Hochschule D{\"u}sseldorf}, doi = {10.20385/opus4-4114}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-41142}, pages = {22}, year = {2023}, language = {en} } @article{WolfUlrichBraun2023, author = {Wolf, Dominik Werner and Ulrich, Markus and Braun, Alexander}, title = {Novel developments of refractive power measurement techniques in the automotive world}, series = {Metrologia}, volume = {60}, journal = {Metrologia}, number = {064001}, publisher = {IOP Publishing}, issn = {1681-7575}, doi = {10.1088/1681-7575/acf1a4}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-41484}, year = {2023}, abstract = {Refractive power measurements serve as the primary quality standard in the automotive glazing industry. In the light of autonomous driving new optical metrics are becoming more and more popular for specifying optical quality requirements for the windshield. Nevertheless, the link between those quantities and the refractive power needs to be established in order to ensure a holistic requirement profile for the windshield. As a consequence, traceable high-resolution refractive power measurements are still required for the glass quality assessment. Standard measurement systems using Moir{\´e} patterns for refractive power monitoring in the automotive industry are highly resolution limited, wherefore they are insufficient for evaluating the camera window area. Consequently, there is a need for more sophisticated refractive power measurement systems that provide a higher spatial resolution. In addition, a calibration procedure has to be developed in order to guarantee for comparability of the measurement results. For increasing the resolution, a measurement setup based on an auto-correlation algorithm is tested in this paper. Furthermore, a calibration procedure is established by using a single reference lens with a nominal refractive power of 100 km-1. For the calibration of the entire measurement range of the system, the lens is tilted by an inclination angle orthogonal to the optical axis. The effective refractive power is then given by the Kerkhof model. By adopting the measurement and calibration procedure presented in this paper, glass suppliers in the automotive industry will be able to detect relevant manufacturing defects within the camera window area more accurately paving the way for a holistic quality assurance of the windshield for future advanced driver-assistance system (ADAS) functionalities. Concurrently, the traceability of the measurement results is ensured by establishing a calibration chain based on a single reference lens, which is traced back to international standards.}, language = {en} } @article{MuellerBraun2023, author = {M{\"u}ller, Patrick and Braun, Alexander}, title = {Local performance evaluation of AI-algorithms with the generalized spatial recall index}, series = {tm - Technisches Messen}, volume = {90}, journal = {tm - Technisches Messen}, number = {7-8}, publisher = {De Gruyter}, issn = {2196-7113}, doi = {10.1515/teme-2023-0013}, pages = {464 -- 477}, year = {2023}, language = {en} } @article{MuellerBraun2023, author = {M{\"u}ller, Patrick and Braun, Alexander}, title = {MTF as a performance indicator for AI algorithms?}, series = {Electronic Imaging: Society for Imaging Science and Technology}, volume = {35}, journal = {Electronic Imaging: Society for Imaging Science and Technology}, number = {16}, publisher = {Society for Imaging Science and Technology}, issn = {2470-1173}, doi = {10.2352/EI.2023.35.16.AVM-125}, pages = {1 -- 7}, year = {2023}, abstract = {Abstract The modulation-transfer function (MTF) is a fundamental optical metric to measure the optical quality of an imaging system. In the automotive industry it is used to qualify camera systems for ADAS/AD. Each modern ADAS/AD system includes evaluation algorithms for environment perception and decision making that are based on AI/ML methods and neural networks. The performance of these AI algorithms is measured by established metrics like Average Precision (AP) or precision-recall-curves. In this article we research the robustness of the link between the optical quality metric and the AI performance metric. A series of numerical experiments were performed with object detection and instance segmentation algorithms (cars, pedestrians) evaluated on image databases with varying optical quality. We demonstrate with these that for strong optical aberrations a distinct performance loss is apparent, but that for subtle optical quality differences - as might arise during production tolerances - this link does not exhibit a satisfactory correlation. This calls into question how reliable the current industry practice is where a produced camera is tested end-of-line (EOL) with the MTF, and fixed MTF thresholds are used to qualify the performance of the camera-under-test.}, language = {en} } @article{StruweWredeVennegeerts2023, author = {Struwe, Julian and Wrede, Holger and Vennegeerts, Hendrik}, title = {Validation Aspects for Grid-Forming Converters Based on System Characteristics and Inertia Impact}, series = {Energies}, volume = {16}, journal = {Energies}, number = {21}, publisher = {MDPI}, issn = {1996-1073}, doi = {10.3390/en16217357}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-48751}, year = {2023}, abstract = {Grid-forming converters are considered a key technology for electrical grids with a high share of renewable energy. However, there is a lack of a general, robust and verifiable definition of what constitutes this behaviour. Therefore, this paper presents three simple scenarios that enable such a definition. They are based on simple black-box simulations that allow manufacturers to protect their development work. It can be shown that grid forming can be clearly distinguished from grid-following controls by their grid behaviour in the proposed scenarios. Extensive results illustrate this and also provide suggestions to deepen the understanding of grid-forming grid behaviour and its impact on system inertia. These findings should inspire the development of a clear definition and ultimately new requirements for converter systems.}, subject = {Stromrichter}, language = {en} } @inproceedings{StruweWredeVennegeerts2023, author = {Struwe, Julian and Wrede, Holger and Vennegeerts, Hendrik}, title = {System Characteristics of Grid-Forming and Grid-Following Converter Systems}, series = {2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe), 04-08 September 2023, Aalborg, Denmark}, booktitle = {2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe), 04-08 September 2023, Aalborg, Denmark}, publisher = {IEEE}, isbn = {978-9-0758-1541-2}, doi = {10.23919/EPE23ECCEEurope58414.2023.10264403}, pages = {1 -- 9}, year = {2023}, language = {en} } @inproceedings{KretschmarNiemannDeckertetal.2023, author = {Kretschmar, Dominik and Niemann, J{\"o}rg and Deckert, Carsten and Pisla, Adrian}, title = {Measuring the Impact of Sustainability of Product-Service-Systems}, series = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, booktitle = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, editor = {Leipzig, Konrad von and Sacks, Natasha and Mc Clelland, Michelle}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031156014}, issn = {2194-0525}, doi = {10.1007/978-3-031-15602-1_32}, pages = {435 -- 446}, year = {2023}, subject = {Nachhaltigkeit}, language = {en} } @techreport{MahmensCajigalNunezStruweetal.2023, author = {Mahmens, Ronald and Cajigal N{\´u}{\~n}ez, Jos{\´e} Manuel and Struwe, Julian and Wrede, Holger}, title = {NetzWind - Netzbildende Windenergieanlagen f{\"u}r zuk{\"u}nftige Energieversorgungsnetze mit dem Attribut zur Schwarzstart- und Inselnetzf{\"a}higkeit}, publisher = {Zenodo}, doi = {10.5281/zenodo.7936219}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-49632}, pages = {54}, year = {2023}, abstract = {Mit dem Forschungsprojekt „NetzWind - Netzbildende Windenergieanlagen f{\"u}r zuk{\"u}nftige Energieversorgungsnetze mit dem Attribut zur Schwarzstart- und Inselnetzf{\"a}higkeit", verfolgten die Hochschule D{\"u}sseldorf HHSD), die W2E Wind to Energy GmbH (W2E) und ConverterTec Deutschland GmbH (CT) in Zusammenarbeit das Ziel, ein Verfahren f{\"u}r Windenergieanlagen (WEA) zu entwickeln, welches einen netzbildenden Betrieb erm{\"o}glicht und damit Lastschwankungen im Netz augenblicklich kompensieren kann. Im Rahmen der Projektbearbeitung wurde auf die detaillierte Betrachtung von WEA mit doppelt-gespeister-Asynchronmaschine (DFIG) verzichtet, daf{\"u}r aber die Erarbeitung des Regelungsverfahrens f{\"u}r WEA mit permanenterregten Synchronmaschinen (PMSG) in einem sehr hohen Detailgrad ausgef{\"u}hrt, um damit die M{\"o}glichkeit zur Adaptierung der Technologie in andere Systeme wie z.B. Photovoltaikanlagen und Batteriespeicher vorzuhalten. Zur Funktionserf{\"u}llung der entwickelten netzdienlichen Regelung sind Energiespeicher zur Deckung der augenblicklichen und kurzzeitigen Leistungsbereitstellung (Momentanreserve) einzusetzen. Aus der Bewertung unterschiedlicher Optionen wurde die Nutzung der in der WEA konstruktionsbedingt enthaltenen Rotationsmassen als mechanischer Energiespeicher betrachtet. Umfangreiche simulations-basierte Untersuchungen unter Verwendung verschiedener Regelungsans{\"a}tze der Turbine zeigen an relevanten Stellen die Wirkung des dynamischen Leistungsabrufs auf die strukturmechanischen Komponenten. Im Ergebnis ist eine h{\"o}here Belastung gegeben, eine Leistungsbereitstellung jedoch m{\"o}glich. Weiterf{\"u}hrende Rechnungen zu Auswirkungen der zus{\"a}tzlichen Belastung auf die Lebens-dauer einzelner Komponenten kann mit den ermittelten Lastzeitreihen auf Bauteilebene erfolgen. Als weitere Option f{\"u}r einen Energiespeicher wurde die Verwendung eines elektrochemischen Energiespeichers auf Basis der Natrium-Ionen Technologie als vorteilhaft erachtet. Diese Technologie ist Stand der Forschung und weist eine {\"A}hnlichkeit mit Lithium-Ionen-Batterien auf. {\"U}ber die Analyse der Leistungsbereitstellung unter Verwendung der Lithium-Ionen-Batterie wurde das Ziel verfolgt, das erarbeitete Regelungskonzept auch f{\"u}r die Natrium-Ionen-Batterie zu verwenden. Daf{\"u}r wurde in der Modellentwicklung das bestehende Umrichtersystem um einen Gleichspannungssteller und die Batterie erweitert und das Lade- und Entladeverhalten des Batteriespeichers in Kombination mit der Bereitstellung von Momentanreserve analysiert und ausgewertet. Die Ergebnisse zeigen ein stabiles Verhalten der Regelung und belegen die M{\"o}glichkeit zur Nutzung von Batteriespeichern. Zur Erf{\"u}llung des Schwarzstarts wurde das Anlagenverhalten analysiert und der Eigenverbrauch der WEA ermittelt. Somit konnte die Kapazit{\"a}t des daf{\"u}r einzusetzenden Energiespeichers festgelegt werden. Weiterhin konnte ein Verfahren entwickelt werden, welches nicht nur den Start ber{\"u}cksichtigt, sondern auch eine erweiterte Frequenzregelung f{\"u}r {\"U}ber- als auch Unterfrequenzen. Die {\"U}berf{\"u}hrung des netzbildenden Regelungsverfahrens auf den vorhandenen Hardware-Controller des Umrichters erfolgte schrittweise, konnte jedoch seitens CT nicht vollst{\"a}ndig abgeschlossen werden. Die Regelungsalgorithmen aus dem Simulationsmodell der Hochschule D{\"u}sseldorf wurden heraus-gel{\"o}st, in eine eigenst{\"a}ndige Dynamic Link Library (DLL) geschrieben und darauffolgend die f{\"u}r den Controller erforderlichen Datentypen der Signale angepasst. Die Regelung zeigt hierbei prinzipiell ein stabiles Verhalten, jedoch f{\"u}hrten die erforderlichen Anpassungen der Datentypen zu Rundungsfehlern. Hier sind weiterf{\"u}hrende Optimierungen erforderlich, um eine vollst{\"a}ndige Portierung zu erm{\"o}glichen. Im Laufe der Projektbearbeitungszeit ist es dem Konsortium gelungen, die erlangten Kenntnisse in diversen Gremien und Arbeitskreise einzubringen und zu diskutieren sowie in internationalen Ver{\"o}ffentlichungen zu pr{\"a}sentieren. Dieses innovative Projekt mit Az. 35340/01 wurde durch die DBU - Deutsche Bundesstiftung Umwelt gef{\"o}rdert. Der Abschlussbericht ist zu beziehen unter www.dbu.de}, subject = {Windenergie}, language = {de} } @inproceedings{NiemannFusseneckerSchloesseretal.2023, author = {Niemann, J{\"o}rg and Fussenecker, Claudia and Schl{\"o}sser, Martin and Kretschmar, Dominik}, title = {A Digital Service Engineering Training Course to Raise Competitiveness in Advanced Service Industries}, series = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, booktitle = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, editor = {Leipzig, Konrad von and Sacks, Natasha and Mc Clelland, Michelle}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031156014}, issn = {2194-0525}, doi = {10.1007/978-3-031-15602-1_17}, pages = {217 -- 228}, year = {2023}, subject = {Wettbewerbsvorteil}, language = {en} } @inproceedings{HaileMelekotKrugerNiemann2023, author = {Haile-Melekot, Yafet and Kruger, Karel and Niemann, J{\"o}rg}, title = {Virtual Reality for Interacting with a Manufacturing System Digital Twin—A Case Study}, series = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, booktitle = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, editor = {Leipzig, Konrad von and Sacks, Natasha and Mc Clelland, Michelle}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031156014}, issn = {2194-0525}, doi = {10.1007/978-3-031-15602-1_14}, pages = {179 -- 190}, year = {2023}, subject = {Virtuelle Realit{\"a}t}, language = {en} } @inproceedings{OcakciDraghiciNiemann2023, author = {Ocakci, Elif and Draghici, Anca and Niemann, J{\"o}rg}, title = {Resources Collaboration and Optimization in Industry 4.0 Environments}, series = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, booktitle = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, editor = {Leipzig, Konrad von and Sacks, Natasha and Mc Clelland, Michelle}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031156014}, issn = {2194-0525}, doi = {10.1007/978-3-031-15602-1_35}, pages = {483 -- 494}, year = {2023}, subject = {Industrie 4.0}, language = {en} } @article{MunnichDederichsKleinetal.2023, author = {Munnich, Patrick and Dederichs, Stefanie and Klein, Paula and Bruno Figura, Carl}, title = {Speech Intelligibility: Lateral Lisp Detection for Real-Time Monitoring}, series = {Current Directions in Biomedical Engineering}, volume = {9}, journal = {Current Directions in Biomedical Engineering}, number = {1}, publisher = {De Gruyter}, issn = {2364-5504}, doi = {10.1515/cdbme-2023-1071}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-49407}, pages = {283 -- 286}, year = {2023}, abstract = {Correcting lisps in speech can prove to be of great difficulty to many, as they may be unaware of whether they are lisping. To help those affected, we have developed a simple algorithm for the real-time identification of the sigmatismus lateralis in "S" sounds within speech via analysis in the frequency domain. The algorithm identifies peaks within the lisp's frequency band after calibration. A frequency band of 3000-4000 Hz has been identified to be generally accurate for lisp and 2500-3000 Hz for the correct pronunciation for a single male test subject. The algorithm splits given speech recordings into smaller segments and compares the number of lisps and non-lisps detected in these segments to categorize. From tests, it was concluded that a segment length of 0.5 s produces the best results. The algorithm does not detect every lisp section, however it does not raise false positives. Our implementation in Julia with multi-threaded per-file analysis is able to analyze 20 files of lengths between 5 s and 10 s within 0.21 s on a Qualcomm Snapdragon 860 smartphone chipset, meaning analysis is far faster than real-time. The proposed algorithm is a simple prototype algorithm capable of realtime analysis of audio in the frequency domain to identify whether lateral lisps are the dominant sibilant pronunciation in a given window. The method was only tested for a single test subject. However, a calibration algorithm capable of adjusting parameters to new individuals is proposed. The algorithm itself should be easily expandable to identify other speech impediments.}, subject = {Lispeln}, language = {en} } @article{MabroukBenimNajietal.2023, author = {Mabrouk, Riheb and Benim, Ali Cemal and Naji, Hassane and Dhahri, Hacen}, title = {Investigation of Pulsed Flow Effects on the Phase Change Within an Open-Cell Metal Foam Using Thermal Lattice Boltzmann Method}, series = {Transport in Porous Media}, volume = {147}, journal = {Transport in Porous Media}, number = {2}, publisher = {Springer Nature}, issn = {0169-3913}, doi = {10.1007/s11242-023-01903-x}, pages = {225 -- 257}, year = {2023}, language = {en} } @article{BiswasMandalMannaetal.2023, author = {Biswas, Nirmalendu and Mandal, Dipak Kumar and Manna, Nirmal K. and Benim, Ali Cemal}, title = {Enhanced energy and mass transport dynamics in a thermo-magneto-bioconvective porous system containing oxytactic bacteria and nanoparticles: cleaner energy application}, series = {Energy}, volume = {263}, journal = {Energy}, number = {B}, publisher = {Elsevier}, issn = {0360-5442}, doi = {10.1016/j.energy.2022.125775}, year = {2023}, language = {en} } @article{TischbeinDorendorfSchmogeretal.2023, author = {Tischbein, Franziska and Dorendorf, Stefan and Schmoger, Christin and Wirtz, Frank and Wilch, Michael and Echternacht, David}, title = {Ausstattung von Niederspannungsnetzen mit Messtechnik f{\"u}r eine netzorientierte Steuerung}, series = {Energiewirtschaftliche Tagesfragen}, volume = {73}, journal = {Energiewirtschaftliche Tagesfragen}, number = {12}, publisher = {VDE Verlag}, issn = {0720-6240}, pages = {44 -- 47}, year = {2023}, language = {de} } @incollection{Rakow2023, author = {Rakow, Thomas C.}, title = {Die Entwicklung von Lehrinhalten im Fach Datenbanken}, series = {Forschungsreport 2022, Hochschule D{\"u}sseldorf}, booktitle = {Forschungsreport 2022, Hochschule D{\"u}sseldorf}, editor = {Wojciechowski, Manfred}, address = {D{\"u}sseldorf}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-42822}, publisher = {Hochschule D{\"u}sseldorf}, pages = {112 -- 113}, year = {2023}, abstract = {Im Projekt EILD.nrw wurden Open Educational Resources (OER) f{\"u}r die Lehre im Fach Datenbanken entwickelt. Lehrende k{\"o}nnen die Tools und Kurse in einer Vielzahl von Lernszenarien einsetzen. Studierende der Informatik und Anwendungsf{\"a}cher lernen den kompletten Lebenszyklus von Datenbanken kennen. Zu diesem Zweck wurden Quizze, interaktive Tools, Lehrvideos und Kurse f{\"u}r Lernmanagementsysteme entwickelt und unter einer Creative Commons-Lizenz ver{\"o}ffentlicht.}, language = {de} } @article{BenimKorucu2023, author = {Benim, Ali Cemal and Korucu, Ayse}, title = {Computational investigation of non-premixed hydrogen-air laminar flames}, series = {International Journal of Hydrogen Energy}, volume = {48}, journal = {International Journal of Hydrogen Energy}, number = {38}, publisher = {Elsevier}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2022.12.248}, pages = {14492 -- 14510}, year = {2023}, subject = {Wasserstoff}, 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{SteenmannRichterLicht2023, author = {Steenmann, Anna and Richter, Jessica and Licht, Thomas}, title = {Micro-additives and their impact on tensile and fracture performance of solder}, series = {Microelectronics Reliability}, volume = {150}, journal = {Microelectronics Reliability}, publisher = {Elsevier}, issn = {0026-2714}, doi = {10.1016/j.microrel.2023.115107}, pages = {5}, year = {2023}, subject = {Zugversuch}, language = {en} } @misc{vonBergSchwoererPrinzetal.2023, author = {von Berg, Markus and Schw{\"o}rer, Paul and Prinz, Lukas and Steffens, Jochen}, title = {OPRA: Akustische Analyse musikalischer Auff{\"u}hrungsr{\"a}ume im Browser}, series = {Akustik Journal}, journal = {Akustik Journal}, number = {3}, issn = {2569-1600}, pages = {41 -- 52}, year = {2023}, abstract = {Der Auff{\"u}hrungsraum leistet einen substantiellen Beitrag zum Erleben von Musikdarbietungen. Zur Beschreibung der Akustik von Auff{\"u}hrungsr{\"a}umen haben sich dabei zahlreiche Messgr{\"o}ßen etabliert, welche bestimmte Wahrnehmungsqualit{\"a}ten, wie z. B. die Halligkeit, abbilden sollen. Dem stellt j{\"u}ngere Forschung rein perzeptive Messinventare gegen{\"u}ber, die den Wahrnehmungseindruck als solchen, losgel{\"o}st vom physikalischen Ursprung, beschreiben. Dieser Artikel beschreibt einen Versuch, diese beiden Forschungsrichtungen zusammenzuf{\"u}hren, indem Bewertungen von Auff{\"u}hrungsr{\"a}umen nach dem perzeptiven Room Acoustical Quality Index (RAQI) durch physikalische Messgr{\"o}ßen modelliert wurden, welche aus einfachen Impulsantwortmessungen ermittelt werden. Dazu wurde eine Auswahl raumakustischer Messgr{\"o}ßen auf f{\"u}nf Dimensionen reduziert und diese als Pr{\"a}diktoren f{\"u}r die einzelnen Wahrnehmungsgr{\"o}ßen des RAQI getestet. Die Berechnung dieser Pr{\"a}diktionsmodelle wird vorgestellt und deren Pr{\"a}zision diskutiert. Anschließend wird die OPRA-Webanwendung vorgestellt, die sowohl die Berechnung der raumakustischen Messgr{\"o}ßen als auch die Pr{\"a}diktion von RAQI-Wahrnehmungsgr{\"o}ßen f{\"u}r die drei Quellsignale Sprache, Orchester und Solotrompete im Browser erm{\"o}glicht. Auch wenn die Pr{\"a}zision der Pr{\"a}diktionsmodelle noch nicht f{\"u}r alle RAQI-Faktoren zuverl{\"a}ssige Ergebnisse liefert, erlaubt OPRA eine umfangreiche akustische Analyse und eine erste Einsch{\"a}tzung der perzeptiven Wirkung von Auff{\"u}hrungsr{\"a}umen.}, language = {de} } @inproceedings{DeckertMohya2023, author = {Deckert, Carsten and Mohya, Ahmed}, title = {Tinkering, Tools and Techniques - Creativity in German Engineering Education}, series = {AIJR Proceedings: Proceedings of the 14th European Conference on Creativity in Innovation}, booktitle = {AIJR Proceedings: Proceedings of the 14th European Conference on Creativity in Innovation}, editor = {Heijne, Katrina}, publisher = {AIJR Publisher}, issn = {2582-3922}, doi = {10.21467/proceedings.154.2}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-51142}, pages = {11 -- 18}, year = {2023}, abstract = {Purpose - Engineers are expected to be the creative problem solvers and innovative tinkerers of a company. This article examines to what extent German tertiary education lives up to this expectation. The analysis of German module descriptions in engineering shows that there are no courses dedicated to creativity and that creativity and its techniques are mentioned only sparsely in the modules of the engineering curriculum. Surveys amongst our students show that they are usually familiar with techniques which are based on generating alternatives such as brainstorming and morphological box, but lack knowledge about techniques based on challenging assumptions such as forced connection. They tend to favour discursive techniques over intuitive ones and techniques which use generation of alternatives as an idea-generating principle. A combination of creativity techniques seems to be most conducive to creative output in our course. Finally, we present some first findings on creative sessions in remote work with the help of virtual whiteboards, which have gained in importance since the pandemic. Methodology - Firstly, we present an document analysis of the modules of Bachelor and Master programs of mechanical engineering at German universities and universities of applied sciences. Secondly, we present results from surveys in our Master course in "Innovation and Technology Management" where we gathered data from students over several years and performed an external evaluation of the output using Consensual Assessment Technique (CAT). These results include which creativity techniques the students know prior to the course and which they prefer as well as which techniques seem to be conducive to engineering creativity. Furthermore we surveyed their experiences with creative sessions as remote work. Conclusion - Overall, the article shows the importance to teach prospective engineers the basics in creativity. Students should have the opportunity to acquire knowledge about and apply different creativity techniques, as different techniques have different strengths and weaknesses and, thus, different areas of fruitful application. They should also have the chance to try out different modes such as in-person sessions and virtual sessions, as some of the future work will most likely shift online. Furthermore, a combination of different creativity techniques makes it more likely that engineers break through their usual systematic-analytic way of thinking and helps them to think outside the box to find creative solutions for the pressing problems of our time.}, subject = {Ingenieurstudium}, language = {en} } @incollection{Deckert2023, author = {Deckert, Carsten}, title = {Sustainable Logistics}, series = {Encyclopedia of Sustainable Management}, booktitle = {Encyclopedia of Sustainable Management}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031259838}, doi = {10.1007/978-3-031-25984-5_131}, pages = {3562 -- 3566}, year = {2023}, language = {en} } @incollection{Deckert2023, author = {Deckert, Carsten}, title = {Supply Chain}, series = {Encyclopedia of Sustainable Management}, booktitle = {Encyclopedia of Sustainable Management}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031259838}, doi = {10.1007/978-3-031-25984-5_132}, pages = {3212 -- 3214}, year = {2023}, language = {en} } @inproceedings{DeckertMohya2023, author = {Deckert, Carsten and Mohya, Ahmed}, title = {Teaching Sustainable Logistics As A Project-Based Learning Course}, series = {European Society for Engineering Education (SEFI), 11-14 September 2023, TUDublin, Ireland}, booktitle = {European Society for Engineering Education (SEFI), 11-14 September 2023, TUDublin, Ireland}, publisher = {TU Dublin}, address = {Dublin}, doi = {10.21427/9D3F-KA64}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-51182}, year = {2023}, abstract = {Sustainable logistics combines the task of the 6R of logistics (right product, right place, right time, right condition, right cost) with social and environmental sustainability, especially low emissions and low resource consumption. This means that a problem that is already challenging, namely planning, executing, and controlling logistical processes, gets even more complex and requires aspects of systems thinking to incorporate environmental and social impacts. Classical approaches of teaching, e.g. lectures with presentations and short exercises on closed problems, do not do justice to the complexity and intricacies of the topic sustainability. In such a context, projectbased learning (PBL) where students do group work on open-ended problems with real-world complexity seems to be a more adequate means to teach the subject. The paper describes a PBL course in which students worked on projects to conceptualize micro-depots for parcel delivery in different areas of D{\"u}sseldorf. A micro-depot is a temporary storage location in a city from which parcels can be delivered by cargo bikes. The aim was to locate the micro-depot, design the delivery routes, check the feasibility, and calculate the reduction of greenhouse gases and other emissions. The course was taught in cooperation with a partner from the courier, express, and parcel delivery industry. The paper describes the experiences with the course and gives recommendations for a successful implementation of PBL in courses on sustainability.}, subject = {Ingenieurstudium}, language = {en} } @inproceedings{WachtKaluzaFleiger2023, author = {Wacht, Anika and Kaluza, Stefan and Fleiger, Philipp}, title = {Carbon Capture and Utilization in Cement Industry—Aspects of the Production of E-Fuels by Upcycling Carbon Dioxide}, series = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, booktitle = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, editor = {Leipzig, Konrad von and Sacks, Natasha and Mc Clelland, Michelle}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031156014}, issn = {2194-0525}, doi = {10.1007/978-3-031-15602-1_44}, pages = {603 -- 612}, year = {2023}, subject = {Carbon dioxide capture and utilization}, language = {en} } @inproceedings{BlaineFusseneckerNiemannetal.2023, author = {Blaine, Deborah and Fussenecker, Claudia and Niemann, J{\"o}rg and Wolff, Karin}, title = {Did the Covid-19 Pandemic Improve Engineering Education?—A South African-German Perspective}, series = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, booktitle = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, editor = {Leipzig, Konrad von and Sacks, Natasha and Mc Clelland, Michelle}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031156014}, issn = {2194-0525}, doi = {10.1007/978-3-031-15602-1_25}, pages = {333 -- 345}, year = {2023}, subject = {COVID-19-Pandemie}, language = {en} } @inproceedings{GrambergKrugerNiemann2023, author = {Gramberg, Till and Kruger, Karel and Niemann, J{\"o}rg}, title = {Augmented Reality for Operators in Smart Manufacturing Environments: A Case Study Implementation}, series = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, booktitle = {Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA '22)}, editor = {Leipzig, Konrad von and Sacks, Natasha and Mc Clelland, Michelle}, publisher = {Springer Nature}, address = {Cham}, isbn = {9783031156014}, issn = {2194-0525}, doi = {10.1007/978-3-031-15602-1_30}, pages = {401 -- 413}, year = {2023}, subject = {Erweiterte Realit{\"a}t (Informatik)}, language = {en} } @inproceedings{LorenzenSchoenigGroteRammetal.2023, author = {Lorenzen, Finn and Sch{\"o}nig, Felix and Grote-Ramm, Wolfgang and Oliveira Brito, Marcel and Neuberger, Heiko and Sobolyev, Alexander}, title = {Continual Adaptation of Compressor Maps During Operation on Measurement Data For Increased Performance of Model-Based Applications in Turbomachinery}, series = {ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, June 26-30, 2023 Boston, Massachusetts, USA}, volume = {Volume 4}, booktitle = {ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, June 26-30, 2023 Boston, Massachusetts, USA}, publisher = {ASME}, address = {Boston}, isbn = {978-0-7918-8697-7}, doi = {10.1115/GT2023-103458}, pages = {1 -- 7}, year = {2023}, abstract = {Higher control engineering concepts, including artificial intelligence and model-based control, are recently becoming more popular in complex industrial applications because they enable a significant increase in efficiency. E.g., a model-based approach can be used to enhance the control and monitoring of several coupled components of a larger turbomachinery train. This requires dynamic models of the components, including all machine characteristics, which may experience a shift in their behavior over the course of their lifetime. Such changes occur due to natural fouling, wear of sub-components or external effects induced by maintenance measures. To overcome this problem, we model machine-characteristic maps with artificial neural networks, which may be used as part of prediction models in a model predictive control unit. If an appropriate data set is available, this allows us to adapt the model to the current behavior of the machine without requiring in-depth knowledge about the underlying physics of this "concept drift", as it is known in literature. However, the training of neural networks is usually connected with high computational effort while the task needs to be executed in real-time during operation. Furthermore, in real operating conditions, machine sensors can only provide labeled data from the current operating point of the machine, which can be stationary for long operation periods of up to several months. In general, this yields only an unrepresentative data subset of the machine-characteristics, which is not sufficient to retrain the whole model to a new state. To solve these problems, we firstly reduce the model adaptation to a convex optimization problem, which can be efficiently solved in real-time conditions. Secondly, we use a specialized data management system with which we can integrate historical data to supplement the unrepresentative data subset. In this paper we show the application of the outlined method on a compressor map and discuss the advantages and requirements of the method in the context of modeling applications for industrial turbomachinery.}, language = {en} } @inproceedings{Kameier2023, author = {Kameier, Frank}, title = {Ist der Blattspitzenl{\"a}rm von Windturbinen Infraschall?}, series = {Tagungsband, DAGA 2023 - 49. Jahrestagung f{\"u}r Akustik 06. - 09. M{\"a}rz 2023, Hamburg}, booktitle = {Tagungsband, DAGA 2023 - 49. Jahrestagung f{\"u}r Akustik 06. - 09. M{\"a}rz 2023, Hamburg}, publisher = {Deutsche Gesellschaft f{\"u}r Akustik e.V.}, address = {Berlin}, isbn = {9783939296218}, pages = {1544 -- 1547}, year = {2023}, language = {en} } @inproceedings{Kameier2023, author = {Kameier, Frank}, title = {Blade tip vortex noise of wind turbines and infrasound [Vortrag]}, series = {European Congress on Renewable Energy and Sustainable Development, November 16-17, 2023, , Italy}, booktitle = {European Congress on Renewable Energy and Sustainable Development, November 16-17, 2023, , Italy}, address = {Rome}, year = {2023}, language = {en} } @inproceedings{KampannGoebelAdam2023, author = {Kampann, Maximilian and Goebel, Johannes and Adam, Mario}, title = {Effizienzuntersuchungen an einem W{\"a}rmepumpensystem mit Schichtspeicher f{\"u}r Raumheizung und Trinkwarmwasser anhand von Hardware-in-the-Loop Versuchen}, series = {RET.Con 2023. 6. Regenerative Energietechnik Konferenz in Nordhausen, 9.-10.2.2023}, booktitle = {RET.Con 2023. 6. Regenerative Energietechnik Konferenz in Nordhausen, 9.-10.2.2023}, editor = {Wesselak, Viktor}, publisher = {Nordhausen}, address = {Hochschule Nordhausen}, isbn = {978-3-940820-21-1}, pages = {176 -- 188}, year = {2023}, language = {de} } @unpublished{GeerkensSieberichsBraunetal.2023, author = {Geerkens, Simon and Sieberichs, Christian and Braun, Alexander and Waschulzik, Thomas}, title = {QI2 -- an Interactive Tool for Data Quality Assurance}, publisher = {arXiv}, year = {2023}, abstract = {The importance of high data quality is increasing with the growing impact and distribution of ML systems and big data. Also the planned AI Act from the European commission defines challenging legal requirements for data quality especially for the market introduction of safety relevant ML systems. In this paper we introduce a novel approach that supports the data quality assurance process of multiple data quality aspects. This approach enables the verification of quantitative data quality requirements. The concept and benefits are introduced and explained on small example data sets. How the method is applied is demonstrated on the well known MNIST data set based an handwritten digits.}, language = {en} } @unpublished{SieberichsGeerkensBraunetal.2023, author = {Sieberichs, Christian and Geerkens, Simon and Braun, Alexander and Waschulzik, Thomas}, title = {ECS -- an Interactive Tool for Data Quality Assurance}, publisher = {arXiv}, doi = {10.48550/arXiv.2307.04368}, year = {2023}, abstract = {With the increasing capabilities of machine learning systems and their potential use in safety-critical systems, ensuring high-quality data is becoming increasingly important. In this paper we present a novel approach for the assurance of data quality. For this purpose, the mathematical basics are first discussed and the approach is presented using multiple examples. This results in the detection of data points with potentially harmful properties for the use in safety-critical systems.}, language = {en} } @article{SaffellNehr2023, author = {Saffell, John and Nehr, Sascha}, title = {Improving Indoor Air Quality through Standardization}, series = {Standards}, volume = {3}, journal = {Standards}, number = {3}, publisher = {MDPI}, issn = {2305-6703}, doi = {10.3390/standards3030019}, pages = {240 -- 267}, year = {2023}, abstract = {Human beings experience a large fraction of their exposure to air pollutants in indoor environments. Air pollution is a large environmental health risk, and exposure to ambient air pollution and indoor air pollution contribute equally to the total number of fatalities worldwide. Although legislative authorities have established limit values for ambient outdoor air and stack emissions, there are inconsistent and variable national and regional limit values for gaseous substances and airborne particulate matter in the built environment (schools, homes, healthcare facilities, offices, and other public spaces). This lack of regulation is unsurprising, because indoor spaces are characterized by complex air chemistry, and their construction materials and types of activities vary significantly. The current understanding of indoor pollutants, including short-lived oxidants, degradation of VOCs, particle formation, and particle composition, is incomplete. It is necessary to identify and assess emerging pollutants and their toxicity, and to consider new consumer products and green construction materials and their impact on indoor air quality (IAQ). Learning from IAQ surveys and audit protocols, research methodologies should be regularized for cross-research comparisons. Some indoor air quality guidance and standards have been written, and several more are in development, with the international ISO 16000 series of indoor standards leading the way for improving indoor air data quality. The WHO has established some ambient air limit values which can mostly be translated into indoor limit values. The built environment needs to harmonize energy efficiency, thermal comfort and air quality standards and guidance. In this review, we discuss the next steps for improving international, regional and national standards and guidance, leading to better and more complete indoor air quality regulations.}, language = {en} } @article{NehrDuarteAlmeidaetal.2023, author = {Nehr, Sascha and Duarte, Regina M. B. O. and Almeida, Antoine S. and Baus, Lukas and Bergmann, Karl-Christian}, title = {Assessing the relevance of allergenic pollen in indoor environments—current knowledge base and research needs}, series = {Allergo Journal International}, volume = {32}, journal = {Allergo Journal International}, number = {6}, publisher = {Springer Nature}, issn = {2197-0378}, doi = {10.1007/s40629-023-00251-y}, pages = {167 -- 175}, year = {2023}, abstract = {SummaryAirborne pollen allergens—a relevant component of bioaerosols and, therefore, of airborne particulate matter—are considered an important metric in air quality assessments. Although the measurement of airborne pollen allergen concentrations in outdoor environments (namely, in urban areas) has been recognized as a key environmental health indicator, no such obligation exists for indoor environments (dwellings or occupational settings). However, people spend most of their daily time (80-90\%) indoors, where the majority of their exposure to air pollution, including pollen allergens, occurs. Nonetheless, the relative importance of airborne pollen allergen exposure indoors differs from outdoors because of differences in pollen loads, sources, dispersion, and degree of penetration from the outdoor surroundings, as well as the differences in the allergenic pollen profiles. In this brief review, we mined the literature over the last 10 years to summarize what existing measurements reveal about the relevance of airborne allergenic pollen in indoor environments. The research priorities on this topic are presented, highlighting the challenges and the motivations for obtaining pollen data in built environments which are key to understand the extent and mechanisms of human exposure to airborne pollen allergens. Thus, we provide a comprehensive assessment of the relevance of airborne allergenic pollen in indoor environments, highlighting knowledge gaps and research needs related to their health effects.}, language = {en} } @article{BausNehrMaeda2023, author = {Baus, Lukas and Nehr, Sascha and Maeda, Nobutaka}, title = {Investigation of CO2-Sorption Characteristics of Readily Available Solid Materials for Indoor Direct Air Capturing}, series = {Indoor Air}, volume = {2023}, journal = {Indoor Air}, editor = {Ming, Ting Zhen}, publisher = {Wiley}, issn = {1600-0668}, doi = {10.1155/2023/8821044}, pages = {1 -- 8}, year = {2023}, abstract = {Direct air capturing (DAC) is an energy demanding process for CO2-removal from air. Ongoing research focuses on the potential of indoor air as DAC-feed to profit from currently unused energetic synergies between DAC and the built environment. In this work, we investigated the performance of three different readily available, solid DAC-adsorbers under typical indoor environmental conditions of 16-25°C, 25-60\% relative humidity (RH), and CO2-concentrations of less than 800 ppm above atmospheric concentrations. The measured mass-specific CO2-adsorption capacities of K2CO3-impregnated activated carbon, polyethylenimine-snow (PEI-snow), and polyethylenimine (PEI) on silica a amount to 6.5 ± 0.3 mg g-1, 52.9 ± 4.9 mg g-1, and 56.9 ± 4.2 mg g-1, respectively. Among the three investigated adsorber materials, PEI on silica is the most promising candidate for DAC-applications as its synthesis is rather simple, the CO2-desorption is feasible at moderate conditions of about 80°C at 100 mbar, and the competing co-adsorption of water does not strongly affect the CO2-adsorption under the investigated experimental conditions.}, language = {en} } @article{NehrJaeckel2023, author = {Nehr, Sascha and J{\"a}ckel, Simon}, title = {Successful Innovation Transfer through Pre-Standardization: A Case Study}, series = {Standards}, volume = {3}, journal = {Standards}, number = {1}, publisher = {MDPI}, issn = {2305-6703}, doi = {10.3390/standards3010004}, pages = {31 -- 42}, year = {2023}, abstract = {This study presents an approach to structure, analyze and evaluate corporate standardization processes using the example of pre-standardization for the reduction of environmental impacts in product design and development. For this purpose, we give a detailed description of the evolution of the European Standard EN 16524 entitled "Mechanical products—Methodology for reduction of environmental impacts in product design and development". The standardization strategy behind the evolution of EN 16524 is analyzed using the approach of a Business Model Canvas combined with an evaluation using pre-defined success factors. Moreover, we derive general recommendations for corporate standardization professionals in checklists for each field of the underlying Business Model Canvas. With regard to the case study depicted here, we come to the conclusion that pre-standards are especially suited for innovation transfer in the field of emerging and rapidly evolving scientific and technical results.}, language = {en} } @incollection{NehrSimmler2023, author = {Nehr, Sascha and Simmler, Walter}, title = {Air, 6. Photochemical Degradation}, series = {Ullmann's Encyclopedia of Industrial Chemistry}, booktitle = {Ullmann's Encyclopedia of Industrial Chemistry}, edition = {1}, publisher = {Wiley}, isbn = {9783527303854}, doi = {10.1002/14356007.o02_o06.pub2}, pages = {1 -- 11}, year = {2023}, language = {en} } @misc{Deckert2023, author = {Deckert, Carsten}, title = {Review of: "Liberalism Caused the Great Enrichment"}, publisher = {Qeios Ltd}, doi = {10.32388/XZT5XF}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-51193}, year = {2023}, language = {en} } @article{VersuemerSteffensWeinzierl2023, author = {Vers{\"u}mer, Siegbert and Steffens, Jochen and Weinzierl, Stefan}, title = {Day-to-day loudness assessments of indoor soundscapes: Exploring the impact of loudness indicators, person, and situation}, series = {The Journal of the Acoustical Society of America}, volume = {153}, journal = {The Journal of the Acoustical Society of America}, number = {5}, publisher = {Acoustical Society of America (ASA)}, issn = {0001-4966}, doi = {10.1121/10.0019413}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:due62-opus-46127}, pages = {2956 -- 2972}, year = {2023}, abstract = {This study investigates loudness perception in real-world contexts using predictors related to the sound, situation, or person. In the study, 105 participants recorded 6594 sound environments in their homes, which were then evaluated based on the Experience Sampling Method. Hierarchical linear regressions using a loudness level based on ISO 532-1 allowed for obtaining the best model fits for predicting perceived loudness and explaining the highest variance. LAeq and LAF5 provided comparable results and may require less computational effort. However, the analysis shows that only one-third of the variance explained by fixed effects was attributable to the loudness level. Sixteen percent stemmed from perceived properties of the soundscape; 1\% were attributable to relatively temporally stable, person-related predictors like participants' age; non-auditory situational predictors made no additional contribution. The results thus did not confirm previous findings on loudness perception under laboratory conditions, emphasizing the importance of the situational context. Along with the current paper, a comprehensive dataset, including the assessed person-related, situational, and sound-related measures as well as LAeq time-series and third-octave spectrograms, is provided to enable further research on sound perception, indoor soundscapes, and emotion.}, subject = {Lautwahrnehmung}, language = {en} } @article{GroteRammLanuschnyLorenzenetal.2023, author = {Grote-Ramm, Wolfgang and Lanuschny, David and Lorenzen, Finn and Oliveira Brito, Marcel and Sch{\"o}nig, Felix}, title = {Continual learning for neural regression networks to cope with concept drift in industrial processes using convex optimisation}, series = {Engineering Applications of Artificial Intelligence}, volume = {120}, journal = {Engineering Applications of Artificial Intelligence}, publisher = {Elsevier}, address = {New York}, issn = {1873-6769}, doi = {10.1016/j.engappai.2023.105927}, pages = {10}, year = {2023}, abstract = {Process models in industrial applications, e.g. predictive maintenance or automation, are subject to both divergence from the underlying system due to their time-variant nature and to high complexity resulting from a wide operational range being covered. Hence, regression models require high accuracy for the present system state and at the same time need to be valid across the whole system operating space. While accuracy for the current system state can be gained by updating the model on the current data, the overall validity must often be retrieved from historical or design data. We propose a method to find an appropriate compromise for these two demands. A pre-trained artificial neural network (ANN) is continually updated on the current sensor data stream using convex optimisation. Thus, a unique and optimal solution is generated in each update step, while robust regression accuracy on the domain that is not covered by the arriving data subset is maintained. This is achieved by introducing a data management system to provide some historical data, constraining the optimisation problem and manipulating the architecture of the ANN. Models updated with this method show reasonable stability but display plastic behaviour at the current operating point.}, language = {en} } @inproceedings{GottschaldReichAdam2023, author = {Gottschald, Jonas and Reich, Marius and Adam, Mario}, title = {Lessons Learned: On the Potentials and Challenges of a Model Predictive Controlled DHN Heat Supply}, series = {Book of Abstracts: 9th International Conference on Smart Energy Systems. Aalborg Universitet}, booktitle = {Book of Abstracts: 9th International Conference on Smart Energy Systems. Aalborg Universitet}, editor = {Lund, Henrik and Mathiesen, Brian Vad and {\O}stergaard, Paul Alberg and Brodersen, Hans J{\o}rgen}, publisher = {Aalborg University}, address = {Aalborg}, pages = {87 -- 87}, year = {2023}, language = {en} } @inproceedings{ReichPrusasAdam2023, author = {Reich, Marius and Prusas, Benedikt and Adam, Mario}, title = {Prior-Approximation of Rule-Based Energy System Simulation for Fast Design Optimization}, series = {Book of Abstracts: 9th International Conference on Smart Energy Systems. Aalborg Universitet}, booktitle = {Book of Abstracts: 9th International Conference on Smart Energy Systems. Aalborg Universitet}, editor = {Lund, Henrik and Mathiesen, Brian Vad and {\O}stergaard, Paul Alberg and Brodersen, Hans J{\o}rgen}, publisher = {Aalborg University}, address = {Aalborg}, pages = {115}, year = {2023}, language = {en} }