TY - CHAP A1 - von Berg, Markus A1 - Schwörer, Paul A1 - Prinz, Lukas A1 - Steffens, Jochen T1 - Analysis of physical and perceptual properties of room impulse responses: development of an online tool T2 - Forum Acusticuum 2023: 10th Convention of European Acoustics Association, Turin, Italy, 11th-15th September 2023 N2 - 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. Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-41955 PB - EAA ER - TY - JOUR A1 - Failing, Luisa A1 - Kaluza, Stefan A1 - Strucks, Peter T1 - Catalytic CO2 methanation: Providing optimal test conditions for kinetic investigations JF - Chemie Ingenieur Technik N2 - 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 KW - CO2 methanation KW - Kinetics KW - Long-term stability KW - Ni catalyst KW - Power-to-Gas Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-40026 SN - 1522-2640 VL - 95 IS - 5 SP - 749 EP - 753 PB - Wiley ER - TY - CHAP A1 - Stöhr, Marcel A1 - Zielke, Thomas ED - Leipzig, Konrad von ED - Sacks, Natasha ED - Mc Clelland, Michelle T1 - Machine Learning for Soft Sensors and an Application in Cement Production T2 - Smart, Sustainable Manufacturing in an Ever-Changing World Proceedings of International Conference on Competitive Manufacturing (COMA ’22) KW - Soft sensors KW - Machine learning KW - Dynamic processes KW - Cement production KW - Robustness KW - Artificial intelligence Y1 - 2023 SN - 978-3-031-15604-5 U6 - https://doi.org/10.1007/978-3-031-15602-1_46 VL - Lecture Notes in Production Engineering SP - 627 EP - 638 PB - Springer Nature Switzerland CY - Cham ER - TY - CHAP A1 - Tischbein, Franziska A1 - Fatemi, Armin A1 - Wirtz, Frank A1 - Schmoger, Christin A1 - Dorendorf, Stefan A1 - Schurtz, Annika A1 - Echternacht, David A1 - Ulbig, Andreas T1 - Development of Strategies for the Smartification of Low-Voltage Grids T2 - ETG-Fb. 170: ETG Kongress 2023 : Die Energiewende beschleunigen, 25. – 26.05.2023 in Kasse Y1 - 2023 SN - 978-3-8007-6108-1 VL - ETG-Fachberichte 170 SP - 438 EP - 444 PB - VDE CY - Berlin ER - TY - CHAP A1 - Fatemi, Armin A1 - Tischbein, Franziska A1 - Wirtz, Frank A1 - Schmoger, Christin A1 - Dorendorf, Stefan A1 - Schurtz, Annika A1 - Echternacht, David A1 - Ulbig, Andreas T1 - On the Impact of Smartification Strategies for the State Estimation of Low Voltage Grids T2 - 13th "Internationale Energiewirtschaftstagung" (IEWT2023), February 15-17, 2023, Vienna, Austria N2 - 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. KW - State Estimation KW - Smart Meter KW - Grid Observability KW - Measurement Technologies Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-41282 SP - 1 EP - 15 PB - arXiv CY - Wien ER - TY - GEN A1 - Deckert, Carsten A1 - Lauermann, Paul T1 - Warum ist es am Rhein so schön? Strategische Ausrichtung des Binnenhafens Bonn T3 - Business Cases in Industrial Engineering - 1 KW - Business Case KW - Hafen KW - Strategie KW - Logistik Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-41121 CY - Düsseldorf ER - TY - GEN A1 - Deckert, Carsten T1 - Now What You Hear Is Not a Test: The Invention and Commercialization of Rap Music T3 - Business Cases in Industrial Engineering - 2 KW - Business Case KW - Musikindustrie KW - Entrepreneurship KW - Innovation Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-41134 CY - Düsseldorf ER - TY - GEN A1 - Deckert, Carsten A1 - Phan Ngoc, Duc Anh T1 - PlayStation 4 vs. Xbox One: Competitive Analysis of the Video Game Industry T3 - Business Cases in Industrial Engineering - 3 KW - Business Case KW - Strategy KW - Delta Model KW - Video Game Industry Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-41142 CY - Düsseldorf ER - TY - JOUR A1 - Wolf, Dominik Werner A1 - Ulrich, Markus A1 - Braun, Alexander T1 - Novel developments of refractive power measurement techniques in the automotive world JF - Metrologia N2 - 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 Moiré 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. Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-41484 UR - http://iopscience.iop.org/article/10.1088/1681-7575/acf1a4 SN - 1681-7575 VL - 60 IS - 064001 PB - IOP Publishing ER - TY - JOUR A1 - Müller, Patrick A1 - Braun, Alexander T1 - Local performance evaluation of AI-algorithms with the generalized spatial recall index JF - tm - Technisches Messen Y1 - 2023 U6 - https://doi.org/10.1515/teme-2023-0013 SN - 2196-7113 VL - 90 IS - 7-8 SP - 464 EP - 477 PB - De Gruyter ER - TY - JOUR A1 - Müller, Patrick A1 - Braun, Alexander T1 - MTF as a performance indicator for AI algorithms? JF - Electronic Imaging: Society for Imaging Science and Technology N2 - 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. KW - AI performance metrics KW - Artificial Intelligence KW - Modulation Transfer Function (MTF) KW - Optical Quality KW - Perception Y1 - 2023 U6 - https://doi.org/10.2352/EI.2023.35.16.AVM-125 SN - 2470-1173 VL - 35 IS - 16 SP - 1 EP - 7 PB - Society for Imaging Science and Technology ER - TY - JOUR A1 - Struwe, Julian A1 - Wrede, Holger A1 - Vennegeerts, Hendrik T1 - Validation Aspects for Grid-Forming Converters Based on System Characteristics and Inertia Impact JF - Energies N2 - 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. KW - Stromrichter KW - Elektrizitätsversorgungsnetz KW - Erneuerbare Energien KW - Netzregelung Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-48751 SN - 1996-1073 VL - 16 IS - 21 PB - MDPI ER - TY - CHAP A1 - Struwe, Julian A1 - Wrede, Holger A1 - Vennegeerts, Hendrik T1 - System Characteristics of Grid-Forming and Grid-Following Converter Systems T2 - 2023 25th European Conference on Power Electronics and Applications (EPE'23 ECCE Europe), 04-08 September 2023, Aalborg, Denmark KW - Terminology KW - Closed box KW - Voltage KW - Power system stability KW - Control systems KW - Stability analysis KW - Europe Y1 - 2023 SN - 978-9-0758-1541-2 U6 - https://doi.org/10.23919/EPE23ECCEEurope58414.2023.10264403 SP - 1 EP - 9 PB - IEEE ER - TY - CHAP A1 - Kretschmar, Dominik A1 - Niemann, Jörg A1 - Deckert, Carsten A1 - Pisla, Adrian ED - Leipzig, Konrad von ED - Sacks, Natasha ED - Mc Clelland, Michelle T1 - Measuring the Impact of Sustainability of Product-Service-Systems T2 - Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA ’22) KW - Nachhaltigkeit KW - Hybrides Leistungsbündel Y1 - 2023 SN - 9783031156014 U6 - https://doi.org/10.1007/978-3-031-15602-1_32 SN - 2194-0525 SP - 435 EP - 446 PB - Springer Nature CY - Cham ER - TY - RPRT A1 - Mahmens, Ronald A1 - Cajigal Núñez, José Manuel A1 - Struwe, Julian A1 - Wrede, Holger T1 - NetzWind – Netzbildende Windenergieanlagen für zukünftige Energieversorgungsnetze mit dem Attribut zur Schwarzstart‐ und Inselnetzfähigkeit N2 - Mit dem Forschungsprojekt „NetzWind - Netzbildende Windenergieanlagen für zukünftige Energieversorgungsnetze mit dem Attribut zur Schwarzstart- und Inselnetzfähigkeit“, verfolgten die Hochschule Düsseldorf HHSD), die W2E Wind to Energy GmbH (W2E) und ConverterTec Deutschland GmbH (CT) in Zusammenarbeit das Ziel, ein Verfahren für Windenergieanlagen (WEA) zu entwickeln, welches einen netzbildenden Betrieb ermöglicht 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, dafür aber die Erarbeitung des Regelungsverfahrens für WEA mit permanenterregten Synchronmaschinen (PMSG) in einem sehr hohen Detailgrad ausgeführt, um damit die Möglichkeit zur Adaptierung der Technologie in andere Systeme wie z.B. Photovoltaikanlagen und Batteriespeicher vorzuhalten. Zur Funktionserfüllung 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 Regelungsansätze der Turbine zeigen an relevanten Stellen die Wirkung des dynamischen Leistungsabrufs auf die strukturmechanischen Komponenten. Im Ergebnis ist eine höhere Belastung gegeben, eine Leistungsbereitstellung jedoch möglich. Weiterführende Rechnungen zu Auswirkungen der zusätzlichen Belastung auf die Lebens-dauer einzelner Komponenten kann mit den ermittelten Lastzeitreihen auf Bauteilebene erfolgen. Als weitere Option für 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 Ähnlichkeit mit Lithium-Ionen-Batterien auf. Über die Analyse der Leistungsbereitstellung unter Verwendung der Lithium-Ionen-Batterie wurde das Ziel verfolgt, das erarbeitete Regelungskonzept auch für die Natrium-Ionen-Batterie zu verwenden. Dafür 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 Möglichkeit zur Nutzung von Batteriespeichern. Zur Erfüllung des Schwarzstarts wurde das Anlagenverhalten analysiert und der Eigenverbrauch der WEA ermittelt. Somit konnte die Kapazität des dafür einzusetzenden Energiespeichers festgelegt werden. Weiterhin konnte ein Verfahren entwickelt werden, welches nicht nur den Start berücksichtigt, sondern auch eine erweiterte Frequenzregelung für Über- als auch Unterfrequenzen. Die Überführung des netzbildenden Regelungsverfahrens auf den vorhandenen Hardware-Controller des Umrichters erfolgte schrittweise, konnte jedoch seitens CT nicht vollständig abgeschlossen werden. Die Regelungsalgorithmen aus dem Simulationsmodell der Hochschule Düsseldorf wurden heraus-gelöst, in eine eigenständige Dynamic Link Library (DLL) geschrieben und darauffolgend die für den Controller erforderlichen Datentypen der Signale angepasst. Die Regelung zeigt hierbei prinzipiell ein stabiles Verhalten, jedoch führten die erforderlichen Anpassungen der Datentypen zu Rundungsfehlern. Hier sind weiterführende Optimierungen erforderlich, um eine vollständige Portierung zu ermöglichen. Im Laufe der Projektbearbeitungszeit ist es dem Konsortium gelungen, die erlangten Kenntnisse in diversen Gremien und Arbeitskreise einzubringen und zu diskutieren sowie in internationalen Veröffentlichungen zu präsentieren. Dieses innovative Projekt mit Az. 35340/01 wurde durch die DBU - Deutsche Bundesstiftung Umwelt gefördert. Der Abschlussbericht ist zu beziehen unter www.dbu.de KW - Windenergie KW - Inselnetz KW - Elektrizitätsversorgungsnetz Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-49632 PB - Zenodo ER - TY - CHAP A1 - Niemann, Jörg A1 - Fussenecker, Claudia A1 - Schlösser, Martin A1 - Kretschmar, Dominik ED - Leipzig, Konrad von ED - Sacks, Natasha ED - Mc Clelland, Michelle T1 - A Digital Service Engineering Training Course to Raise Competitiveness in Advanced Service Industries T2 - Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA ’22) KW - Service Engineering KW - Wettbewerbsvorteil KW - Dienstleistungssektor KW - Digitalisierung KW - Schulung Y1 - 2023 SN - 9783031156014 U6 - https://doi.org/10.1007/978-3-031-15602-1_17 SN - 2194-0525 SP - 217 EP - 228 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Haile-Melekot, Yafet A1 - Kruger, Karel A1 - Niemann, Jörg ED - Leipzig, Konrad von ED - Sacks, Natasha ED - Mc Clelland, Michelle T1 - Virtual Reality for Interacting with a Manufacturing System Digital Twin—A Case Study T2 - Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA ’22) KW - Virtuelle Realität KW - Digitaler Zwilling KW - Industrie 4.0 Y1 - 2023 SN - 9783031156014 U6 - https://doi.org/10.1007/978-3-031-15602-1_14 SN - 2194-0525 SP - 179 EP - 190 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Ocakci, Elif A1 - Draghici, Anca A1 - Niemann, Jörg ED - Leipzig, Konrad von ED - Sacks, Natasha ED - Mc Clelland, Michelle T1 - Resources Collaboration and Optimization in Industry 4.0 Environments T2 - Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA ’22) KW - Industrie 4.0 KW - Operative Planung KW - Kapazitätsplanung KW - Planungsprozess Y1 - 2023 SN - 9783031156014 U6 - https://doi.org/10.1007/978-3-031-15602-1_35 SN - 2194-0525 SP - 483 EP - 494 PB - Springer Nature CY - Cham ER - TY - JOUR A1 - Munnich, Patrick A1 - Dederichs, Stefanie A1 - Klein, Paula A1 - Bruno Figura, Carl T1 - Speech Intelligibility: Lateral Lisp Detection for Real-Time Monitoring JF - Current Directions in Biomedical Engineering N2 - 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. KW - Lispeln KW - Signalverarbeitung Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-49407 SN - 2364-5504 VL - 9 IS - 1 SP - 283 EP - 286 PB - De Gruyter ER - TY - JOUR A1 - Mabrouk, Riheb A1 - Benim, Ali Cemal A1 - Naji, Hassane A1 - Dhahri, Hacen T1 - Investigation of Pulsed Flow Effects on the Phase Change Within an Open-Cell Metal Foam Using Thermal Lattice Boltzmann Method JF - Transport in Porous Media KW - Thermal lattice Boltzmann method KW - Energetic and exergetic efficiencies KW - Local thermal non-equilibrium KW - Solidification process KW - Melting KW - Porous media KW - Pulsating flow Y1 - 2023 U6 - https://doi.org/10.1007/s11242-023-01903-x SN - 0169-3913 VL - 147 IS - 2 SP - 225 EP - 257 PB - Springer Nature ER - TY - JOUR A1 - Biswas, Nirmalendu A1 - Mandal, Dipak Kumar A1 - Manna, Nirmal K. A1 - Benim, Ali Cemal T1 - Enhanced energy and mass transport dynamics in a thermo-magneto-bioconvective porous system containing oxytactic bacteria and nanoparticles: cleaner energy application JF - Energy Y1 - 2023 U6 - https://doi.org/10.1016/j.energy.2022.125775 SN - 0360-5442 VL - 263 IS - B PB - Elsevier ER - TY - JOUR A1 - Tischbein, Franziska A1 - Dorendorf, Stefan A1 - Schmoger, Christin A1 - Wirtz, Frank A1 - Wilch, Michael A1 - Echternacht, David T1 - Ausstattung von Niederspannungsnetzen mit Messtechnik für eine netzorientierte Steuerung JF - Energiewirtschaftliche Tagesfragen Y1 - 2023 SN - 0720-6240 VL - 73 IS - 12 SP - 44 EP - 47 PB - VDE Verlag ER - TY - CHAP A1 - Rakow, Thomas C. ED - Wojciechowski, Manfred T1 - Die Entwicklung von Lehrinhalten im Fach Datenbanken T2 - Forschungsreport 2022, Hochschule Düsseldorf N2 - Im Projekt EILD.nrw wurden Open Educational Resources (OER) für die Lehre im Fach Datenbanken entwickelt. Lehrende können die Tools und Kurse in einer Vielzahl von Lernszenarien einsetzen. Studierende der Informatik und Anwendungsfächer lernen den kompletten Lebenszyklus von Datenbanken kennen. Zu diesem Zweck wurden Quizze, interaktive Tools, Lehrvideos und Kurse für Lernmanagementsysteme entwickelt und unter einer Creative Commons-Lizenz veröffentlicht. N2 - In the EILD.nrw project, Open Educational Resources (OER) are being developed for teaching databases. Instructors can use the tools and courses in a variety of learning scenarios. Students of computer science and application subjects learn the complete life cycle of databases. For this purpose, quizzes, interactive tools, instructional videos, and courses for learning management systems were developed and published under a Creative Commons license. T2 - The development of teaching content in the subject of databases (in German) KW - Lehrinhalte KW - teaching content KW - Datenbanken KW - Hochschule KW - OER KW - databases KW - higher education Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-42822 UR - https://doi.org/10.20385/opus4-4007 SP - 112 EP - 113 CY - Düsseldorf ER - TY - JOUR A1 - Benim, Ali Cemal A1 - Korucu, Ayse T1 - Computational investigation of non-premixed hydrogen-air laminar flames JF - International Journal of Hydrogen Energy KW - Wasserstoff KW - Laminare Strömung KW - Reaktionsmechanismus KW - Stickstoffoxide KW - Hydrogen combustion KW - Non-premixed combustion KW - Laminar flames KW - Reaction mechanisms KW - Nitrogen oxide formation Y1 - 2023 U6 - https://doi.org/10.1016/j.ijhydene.2022.12.248 SN - 0360-3199 VL - 48 IS - 38 SP - 14492 EP - 14510 PB - Elsevier ER - TY - JOUR A1 - Biswas, Nirmalendu A1 - Mandal, Dipak Kumar A1 - Bose, Sharmistha A1 - Manna, Nirmal K. A1 - Benim, Ali Cemal T1 - Experimental Treatment of Solar Chimney Power Plant — A Comprehensive Review JF - Energies N2 - 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. KW - Erneuerbare Energien KW - Aufwindkraftwerk KW - Nachhaltigkeit KW - Zukunftserwartung KW - renewable energy KW - solar chimney power plant KW - SCPP KW - experimental KW - hybrid system KW - environmental impact KW - sustainability KW - challenges KW - future perspectives Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-46139 SN - 1996-1073 VL - 16 IS - 17 PB - MDPI ER - TY - JOUR A1 - Steenmann, Anna A1 - Richter, Jessica A1 - Licht, Thomas T1 - Micro-additives and their impact on tensile and fracture performance of solder JF - Microelectronics Reliability KW - Zugversuch KW - Lot (Werkstoff) KW - Tensile tests KW - indicator of reliability KW - Micro additives KW - SAC solder KW - Lead-free solder Y1 - 2023 U6 - https://doi.org/10.1016/j.microrel.2023.115107 SN - 0026-2714 VL - 150 PB - Elsevier ER - TY - GEN A1 - von Berg, Markus A1 - Schwörer, Paul A1 - Prinz, Lukas A1 - Steffens, Jochen T1 - OPRA: Akustische Analyse musikalischer Aufführungsräume im Browser T2 - Akustik Journal N2 - Der Aufführungsraum leistet einen substantiellen Beitrag zum Erleben von Musikdarbietungen. Zur Beschreibung der Akustik von Aufführungsräumen haben sich dabei zahlreiche Messgrößen etabliert, welche bestimmte Wahrnehmungsqualitäten, wie z. B. die Halligkeit, abbilden sollen. Dem stellt jüngere Forschung rein perzeptive Messinventare gegenüber, die den Wahrnehmungseindruck als solchen, losgelöst vom physikalischen Ursprung, beschreiben. Dieser Artikel beschreibt einen Versuch, diese beiden Forschungsrichtungen zusammenzuführen, indem Bewertungen von Aufführungsräumen nach dem perzeptiven Room Acoustical Quality Index (RAQI) durch physikalische Messgrößen modelliert wurden, welche aus einfachen Impulsantwortmessungen ermittelt werden. Dazu wurde eine Auswahl raumakustischer Messgrößen auf fünf Dimensionen reduziert und diese als Prädiktoren für die einzelnen Wahrnehmungsgrößen des RAQI getestet. Die Berechnung dieser Prädiktionsmodelle wird vorgestellt und deren Präzision diskutiert. Anschließend wird die OPRA-Webanwendung vorgestellt, die sowohl die Berechnung der raumakustischen Messgrößen als auch die Prädiktion von RAQI-Wahrnehmungsgrößen für die drei Quellsignale Sprache, Orchester und Solotrompete im Browser ermöglicht. Auch wenn die Präzision der Prädiktionsmodelle noch nicht für alle RAQI-Faktoren zuverlässige Ergebnisse liefert, erlaubt OPRA eine umfangreiche akustische Analyse und eine erste Einschätzung der perzeptiven Wirkung von Aufführungsräumen. N2 - Performance spaces have a substantial influence on the experience of musical performances, and numerous physical measures have been proposed to describe different aspects of the perceptual impact singular of a performance space. Recent research complements these physical measures with purely perceptual inventories that describe the auditory impression as such, and somewhat detached from its physical origin. This article describes an attempt to bring these two research directions together by modelling evaluations of performance spaces according to the subject-centered Room Acoustical Quality Index (RAQI) based on physical measures obtained from simple impulse response measurements. A selection of room acoustical parameters was reduced to five dimensions which were tested then as predictors for the perceptual qualities of the RAQI. The calculation of these prediction models is presented and the models’ prediction performance discussed. Then, the OPRA-online-tool is presented that enables both the calculation of the physical measures and the prediction of RAQI factors for the three source signals speech, orchestra and solo trumpet within the web browser. Even though the precision of the prediction models does not yet provide reliable estimates of all RAQI factors, OPRA allows a first assessment of the perceptual effect of performance spaces on speech and music. T2 - OPRA: acoustical analysis of musical performance spaces in a web browser KW - Raumakustik KW - Webandwendung KW - akustische Wahrnehmung Y1 - 2023 UR - https://www.dega-akustik.de/fileadmin/dega-akustik.de/publikationen/akustik-journal/23-03/akustik_journal_2023_03_online_artikel4.pdf SN - 2569-1600 IS - 3 SP - 41 EP - 52 ER - TY - CHAP A1 - Deckert, Carsten A1 - Mohya, Ahmed ED - Heijne, Katrina T1 - Tinkering, Tools and Techniques – Creativity in German Engineering Education T2 - AIJR Proceedings: Proceedings of the 14th European Conference on Creativity in Innovation N2 - 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. KW - Ingenieurstudium KW - Kreativität Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-51142 SN - 2582-3922 SP - 11 EP - 18 PB - AIJR Publisher ER - TY - CHAP A1 - Deckert, Carsten T1 - Sustainable Logistics T2 - Encyclopedia of Sustainable Management Y1 - 2023 SN - 9783031259838 U6 - https://doi.org/10.1007/978-3-031-25984-5_131 SP - 3562 EP - 3566 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Deckert, Carsten T1 - Supply Chain T2 - Encyclopedia of Sustainable Management Y1 - 2023 SN - 9783031259838 U6 - https://doi.org/10.1007/978-3-031-25984-5_132 SP - 3212 EP - 3214 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Deckert, Carsten A1 - Mohya, Ahmed T1 - Teaching Sustainable Logistics As A Project-Based Learning Course T2 - European Society for Engineering Education (SEFI), 11-14 September 2023, TUDublin, Ireland N2 - 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 Düsseldorf. 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. KW - Ingenieurstudium KW - Nachhaltigkeit KW - Logistik Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-51182 PB - TU Dublin CY - Dublin ER - TY - CHAP A1 - Wacht, Anika A1 - Kaluza, Stefan A1 - Fleiger, Philipp ED - Leipzig, Konrad von ED - Sacks, Natasha ED - Mc Clelland, Michelle T1 - Carbon Capture and Utilization in Cement Industry—Aspects of the Production of E-Fuels by Upcycling Carbon Dioxide T2 - Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA ’22) KW - Carbon dioxide capture and utilization KW - Synthetischer Kraftstoff KW - Upcycling KW - Kreislaufwirtschaft KW - Zementindustrie KW - Kohlendioxid Y1 - 2023 SN - 9783031156014 U6 - https://doi.org/10.1007/978-3-031-15602-1_44 SN - 2194-0525 SP - 603 EP - 612 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Blaine, Deborah A1 - Fussenecker, Claudia A1 - Niemann, Jörg A1 - Wolff, Karin ED - Leipzig, Konrad von ED - Sacks, Natasha ED - Mc Clelland, Michelle T1 - Did the Covid-19 Pandemic Improve Engineering Education?—A South African-German Perspective T2 - Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA ’22) KW - COVID-19-Pandemie KW - Ingenieurstudium KW - Fernunterricht KW - Internationaler Vergleich Y1 - 2023 SN - 9783031156014 U6 - https://doi.org/10.1007/978-3-031-15602-1_25 SN - 2194-0525 SP - 333 EP - 345 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Gramberg, Till A1 - Kruger, Karel A1 - Niemann, Jörg ED - Leipzig, Konrad von ED - Sacks, Natasha ED - Mc Clelland, Michelle T1 - Augmented Reality for Operators in Smart Manufacturing Environments: A Case Study Implementation T2 - Smart, Sustainable Manufacturing in an Ever-Changing World: Proceedings of International Conference on Competitive Manufacturing (COMA ’22) KW - Erweiterte Realität (Informatik) KW - Intelligente Fertigung KW - Industrie 4.0 Y1 - 2023 SN - 9783031156014 U6 - https://doi.org/10.1007/978-3-031-15602-1_30 SN - 2194-0525 SP - 401 EP - 413 PB - Springer Nature CY - Cham ER - TY - CHAP A1 - Lorenzen, Finn A1 - Schönig, Felix A1 - Grote-Ramm, Wolfgang A1 - Oliveira Brito, Marcel A1 - Neuberger, Heiko A1 - Sobolyev, Alexander T1 - Continual Adaptation of Compressor Maps During Operation on Measurement Data For Increased Performance of Model-Based Applications in Turbomachinery T2 - ASME Turbo Expo 2023: Turbomachinery Technical Conference and Exposition, June 26–30, 2023 Boston, Massachusetts, USA N2 - 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. KW - compressors KW - Intelligent control KW - Neural networks KW - Modeling Y1 - 2023 SN - 978-0-7918-8697-7 U6 - https://doi.org/10.1115/GT2023-103458 VL - Volume 4 SP - 1 EP - 7 PB - ASME CY - Boston ER - TY - CHAP A1 - Kameier, Frank T1 - Ist der Blattspitzenlärm von Windturbinen Infraschall? T2 - Tagungsband, DAGA 2023 - 49. Jahrestagung für Akustik 06. - 09. März 2023, Hamburg Y1 - 2023 SN - 9783939296218 SP - 1544 EP - 1547 PB - Deutsche Gesellschaft für Akustik e.V. CY - Berlin ER - TY - CHAP A1 - Kameier, Frank T1 - Blade tip vortex noise of wind turbines and infrasound [Vortrag] T2 - European Congress on Renewable Energy and Sustainable Development, November 16-17, 2023, , Italy Y1 - 2023 CY - Rome ER - TY - CHAP A1 - Kampann, Maximilian A1 - Goebel, Johannes A1 - Adam, Mario ED - Wesselak, Viktor T1 - Effizienzuntersuchungen an einem Wärmepumpensystem mit Schichtspeicher für Raumheizung und Trinkwarmwasser anhand von Hardware-in-the-Loop Versuchen T2 - RET.Con 2023. 6. Regenerative Energietechnik Konferenz in Nordhausen, 9.-10.2.2023 Y1 - 2023 UR - https://web.archive.org/web/20250814135139/https://www.hs-nordhausen.de/wp-content/uploads/sites/8/2024/06/Tagungsband_RETCon_2023_Web.pdf SN - 978-3-940820-21-1 SP - 176 EP - 188 PB - Nordhausen CY - Hochschule Nordhausen ER - TY - INPR A1 - Geerkens, Simon A1 - Sieberichs, Christian A1 - Braun, Alexander A1 - Waschulzik, Thomas T1 - QI2 -- an Interactive Tool for Data Quality Assurance N2 - 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. KW - Data Structures and Algorithms KW - Machine Learning KW - Computers and Society KW - Artificial Intelligence Y1 - 2023 PB - arXiv ER - TY - INPR A1 - Sieberichs, Christian A1 - Geerkens, Simon A1 - Braun, Alexander A1 - Waschulzik, Thomas T1 - ECS -- an Interactive Tool for Data Quality Assurance N2 - 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. KW - Artificial Intelligence KW - Machine Learning KW - PrePrint KW - Systems and Control Y1 - 2023 U6 - https://doi.org/10.48550/arXiv.2307.04368 PB - arXiv ER - TY - JOUR A1 - Saffell, John A1 - Nehr, Sascha T1 - Improving Indoor Air Quality through Standardization JF - Standards N2 - 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. KW - indoor air quality KW - IAQ KW - air quality standards KW - air quality regulations KW - air quality guidance KW - indoor pollutants KW - IAQ survey KW - indoor air data quality KW - limit value KW - Luftreinhaltung Y1 - 2023 U6 - https://doi.org/10.3390/standards3030019 SN - 2305-6703 VL - 3 IS - 3 SP - 240 EP - 267 PB - MDPI ER - TY - JOUR A1 - Nehr, Sascha A1 - Duarte, Regina M. B. O. A1 - Almeida, Antoine S. A1 - Baus, Lukas A1 - Bergmann, Karl-Christian T1 - Assessing the relevance of allergenic pollen in indoor environments—current knowledge base and research needs JF - Allergo Journal International N2 - 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. KW - standardization strategies KW - pre-standards KW - success factors KW - Business Model Canvas KW - environmental impact KW - Luftreinhaltung Y1 - 2023 U6 - https://doi.org/10.1007/s40629-023-00251-y SN - 2197-0378 VL - 32 IS - 6 SP - 167 EP - 175 PB - Springer Nature ER - TY - JOUR A1 - Baus, Lukas A1 - Nehr, Sascha A1 - Maeda, Nobutaka ED - Ming, Ting Zhen T1 - Investigation of CO2-Sorption Characteristics of Readily Available Solid Materials for Indoor Direct Air Capturing JF - Indoor Air N2 - 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. KW - Luftreinhaltung Y1 - 2023 U6 - https://doi.org/10.1155/2023/8821044 SN - 1600-0668 VL - 2023 SP - 1 EP - 8 PB - Wiley ER - TY - JOUR A1 - Nehr, Sascha A1 - Jäckel, Simon T1 - Successful Innovation Transfer through Pre-Standardization: A Case Study JF - Standards N2 - 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. KW - standardization strategies KW - pre-standards KW - success factors KW - Business Model Canvas KW - environmental impact KW - Luftreinhaltung Y1 - 2023 U6 - https://doi.org/10.3390/standards3010004 SN - 2305-6703 VL - 3 IS - 1 SP - 31 EP - 42 PB - MDPI ER - TY - CHAP A1 - Nehr, Sascha A1 - Simmler, Walter T1 - Air, 6. Photochemical Degradation T2 - Ullmann's Encyclopedia of Industrial Chemistry KW - Luftreinhaltung Y1 - 2023 SN - 9783527303854 U6 - https://doi.org/10.1002/14356007.o02_o06.pub2 SP - 1 EP - 11 PB - Wiley ET - 1 ER - TY - JOUR A1 - Deckert, Carsten T1 - Review of: "Liberalism Caused the Great Enrichment" Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-51193 PB - Qeios Ltd ER - TY - JOUR A1 - Versümer, Siegbert A1 - Steffens, Jochen A1 - Weinzierl, Stefan T1 - Day-to-day loudness assessments of indoor soundscapes: Exploring the impact of loudness indicators, person, and situation JF - The Journal of the Acoustical Society of America N2 - 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. KW - Lautwahrnehmung KW - Akustische Eigenschaft KW - Hörschädigung KW - Lautstärke KW - Audiometrie KW - Sonogramm KW - Regressionsanalyse KW - Gauß-Prozess KW - Auditory perception KW - Acoustical properties KW - Hearing impairment KW - Loudness perception KW - Audiometry KW - Acoustic noise control KW - Spectrograms KW - Acoustic ecology KW - Regression analysis KW - Gaussian processes Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:hbz:due62-opus-46127 SN - 0001-4966 VL - 153 IS - 5 SP - 2956 EP - 2972 PB - Acoustical Society of America (ASA) ER - TY - JOUR A1 - Grote-Ramm, Wolfgang A1 - Lanuschny, David A1 - Lorenzen, Finn A1 - Oliveira Brito, Marcel A1 - Schönig, Felix T1 - Continual learning for neural regression networks to cope with concept drift in industrial processes using convex optimisation JF - Engineering Applications of Artificial Intelligence N2 - 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. KW - Continual learning KW - Concept drift KW - Catastrophic forgetting KW - Convex optimization Y1 - 2023 U6 - https://doi.org/10.1016/j.engappai.2023.105927 SN - 1873-6769 VL - 120 PB - Elsevier CY - New York ER - TY - CHAP A1 - Gottschald, Jonas A1 - Reich, Marius A1 - Adam, Mario ED - Lund, Henrik ED - Mathiesen, Brian Vad ED - Østergaard, Paul Alberg ED - Brodersen, Hans Jørgen T1 - Lessons Learned: On the Potentials and Challenges of a Model Predictive Controlled DHN Heat Supply T2 - Book of Abstracts: 9th International Conference on Smart Energy Systems. Aalborg Universitet KW - District Heating KW - Machine Learning KW - Model Predictive Control KW - Monitoring KW - BestHeatNet Y1 - 2023 UR - https://vbn.aau.dk/ws/portalfiles/portal/548360793/BoA-2023FINAL-2.pdf SP - 87 EP - 87 PB - Aalborg University CY - Aalborg ER - TY - CHAP A1 - Reich, Marius A1 - Prusas, Benedikt A1 - Adam, Mario ED - Lund, Henrik ED - Mathiesen, Brian Vad ED - Østergaard, Paul Alberg ED - Brodersen, Hans Jørgen T1 - Prior-Approximation of Rule-Based Energy System Simulation for Fast Design Optimization T2 - Book of Abstracts: 9th International Conference on Smart Energy Systems. Aalborg Universitet KW - Energy supply systems KW - Rule based simulation KW - Design Optimization KW - Metamodeling KW - SmartPrior Y1 - 2023 UR - https://vbn.aau.dk/ws/portalfiles/portal/548360793/BoA-2023FINAL-2.pdf PB - Aalborg University CY - Aalborg ER -