TY - CONF AB - Abstract. The combination of incremental sheet metal forming and high-speed forming offers new possibilities for flexible forming processes in the production of large sheet metal components of increased complexity with relatively low forming energies. In this paper, the general feasibility and process differences between the pulse-driven high-speed forming technologies of electrohydraulic and electromagnetic forming were investigated. An example component made of EN AW 6016 aluminum sheet metal was thus formed incrementally by both processes and the forming result evaluated by an optical 3D measurement system. For this purpose, a forming strategy for electromagnetic incremental forming (EMIF) was developed, tested and adapted to the electrohydraulic incremental forming process (EHIF). The discharge energy, the tool displacement and the pressure field of the forming zone were determined as relevant parameters for the definition of an adequate tool path strategy. It was found that the EHIF process is less affected by larger distances between the tool and the blank, while this is a critical variable for force application to the component during EMIF. On the other hand, the more uniform pressure distribution of the EMIF process is advantageous for forming large steady component areas. AU - Holzmüller, Maik AU - Linnemann, Maik AU - Homberg, Werner AU - Psyk, Verena AU - Kräusel, Verena AU - Kroos, Janika ID - 43044 KW - Incremental Sheet Forming KW - Aluminium KW - High-Speed Forming SN - 2474-395X T2 - Materials Research Proceedings TI - Proof of concept for incremental sheet metal forming by means of electromagnetic and electrohydraulic high-speed forming VL - 25 ER - TY - JOUR AB - The pressure fields generated by two simultaneous discharges have not been investigated on any notable scale for the electrohydraulic impulse forming method. In this study, the synchronicity of two discharges is ensured by the sequential connection of two wires mounted in two spark gaps in a common volume of liquid. The objective is to experimentally confirm the equilibrium of the energies evolved in two spark gaps by means of pressure measurements. In addition, multipoint membrane pressure gauges demonstrated the feasibility of easily recording detailed pressure maps. Based on the membrane deformation mechanism and material strengthening under static and impulse conditions, the processing procedure is further developed so as to achieve better accuracy in the determination of pressure field parameters. The practical equality of the pressure fields on the left and right halves of the flat-loaded area confirms the equality of energies evolved in the two spark gaps. The direct shock waves create zones with the most intensive loading. These results provide a basis for the development of new electrohydraulic technologies involving the application of two simultaneous discharges with equal energy and pressure parameters. AU - Knyazyev, Mykhaylo AU - Holzmüller, Maik AU - Homberg, Werner ID - 43045 IS - 1 JF - Journal of Manufacturing and Materials Processing KW - impulse KW - forming KW - electrohydraulic KW - discharge KW - wire KW - pressure gauge KW - pressure field SN - 2504-4494 TI - Investigation of Pressure Fields Generated by Two Simultaneous Discharges in Liquid Initiated by Wires VL - 7 ER - TY - JOUR AU - Neumann, Phillip ID - 44321 IS - 5 JF - Zeitschrift für Heilpädagogik KW - Inklusion KW - Sonderpädagogik KW - Bildung KW - Bildungsstudien KW - Integration SN - 0513-9066 TI - Studien zu Schulleistungen und ihre Aufbereitung VL - 74 ER - TY - CONF AU - Hami Dindar, Iman AU - Lutters, Nicole AU - Kenig, Eugeny ID - 44320 T2 - Jahrestreffen der ProcessNet-Fachgruppen Fluidverfahrenstechnik und Adsoprtion TI - Wässrige Glucosaminlösung als neues Lösungsmittel zur CO2-Abscheidung ER - TY - CONF AB - State estimation when only a partial model of a considered system is available remains a major challenge in many engineering fields. This work proposes a joint, square-root unscented Kalman filter to estimate states and model uncertainties simultaneously by linear combinations of physics-motivated library functions. Using a sparsity promoting approach, a selection of those linear combinations is chosen and thus an interpretable model can be extracted. Results indicate a small estimation error compared to a traditional square-root unscented Kalman filter and exhibit the enhancement of physically meaningful models. AU - Götte, Ricarda-Samantha AU - Timmermann, Julia ID - 34171 IS - 1 KW - joint estimation KW - unscented transform KW - Kalman filter KW - sparsity KW - data-driven KW - compressed sensing T2 - 12th IFAC Symposium on Nonlinear Control Systems (NOLCOS 2022) TI - Estimating States and Model Uncertainties Jointly by a Sparsity Promoting UKF VL - 56 ER - TY - JOUR AB - Room temperature sodium-sulfur (RT Na-S) batteries are considered potential candidates for stationary power storage applications due to their low cost, broad active material availability and low toxicity. Challenges, such as high volume expansion of the S-cathode upon discharge, low electronic conductivity of S as active material and herewith limited rate capability as well as the shuttling of polysulfides (PSs) as intermediates often impede the cycle stability and practical application of Na-S batteries. Sulfurized poly(acrylonitrile) (SPAN) inherently inhibits the shuttling of PSs and shows compatibility with carbonate-based electrolytes, however, its exact redox mechanism remained unclear to date. Herein, we implement a commercially available and simple electrolyte into the Na-SPAN cell chemistry and demonstrate its high rate and cycle stability. Through the application of in situ techniques utilizing electronic impedance spectroscopy (EIS) and X-ray absorption spectroscopy (XAS) at different depths of charge and discharge, an insight into SPAN’s redox chemistry is obtained. AU - Kappler, Julian AU - Tonbul, Güldeniz AU - Schoch, Roland AU - Murugan, Saravanakumar AU - Nowakowski, Michał AU - Lange, Pia Lena AU - Klostermann, Sina Vanessa AU - Bauer, Matthias AU - Schleid, Thomas AU - Kästner, Johannes AU - Buchmeiser, Michael Rudolf ID - 40981 IS - 1 JF - Journal of The Electrochemical Society KW - Materials Chemistry KW - Electrochemistry KW - Surfaces KW - Coatings and Films KW - Condensed Matter Physics KW - Renewable Energy KW - Sustainability and the Environment KW - Electronic KW - Optical and Magnetic Materials SN - 0013-4651 TI - Understanding the Redox Mechanism of Sulfurized Poly(acrylonitrile) as Highly Rate and Cycle Stable Cathode Material for Sodium-Sulfur Batteries VL - 170 ER - TY - JOUR AB - The success of engineering complex technical systems is determined by meeting customer requirements and institutional regulations. One example relevant to the automobile industry is the United Nations Economic Commission of Europe (UN ECE), which specifies the homologation of automobile series and requires proof of traceability. The required traceability can be achieved by modeling system artifacts and their relations in a consistent, seamless model—an effect-chain model. Currently, no in-depth methodology exists to support engineers in developing certification-compliant effect-chain models. For this purpose, a new methodology for certification-compliant effect-chain modeling was developed, which includes extensions of an existing method, suitable models, and tools to support engineers in the modeling process. For evaluation purposes, applicability is proven based on the experience of more than 300 workshops at an automotive OEM and an automotive supplier. The following case example is chosen to demonstrate applicability: the development of a window lifter that has to meet the demands of UN ECE Regulations R156 and R21. Results indicate multiple benefits in supporting engineers with the certification-compliant modeling of effect chains. Three benefits are goal-oriented modeling to reduce the necessary modeling capacity, increasing model quality by applying information quality criteria, and the potential to reduce costs through automatable effect-chain analyses for technical changes. Further, companies in the automotive and other industries will benefit from increased modeling capabilities that can be used for architecture modeling and to comply with other regulations such as ASPICE or ISO 26262. AU - Gräßler, Iris AU - Wiechel, Dominik AU - Koch, Anna-Sophie AU - Sturm, Tim AU - Markfelder, Thomas ID - 44382 IS - 3 JF - Systems KW - Information Systems and Management KW - Computer Networks and Communications KW - Modeling and Simulation KW - Control and Systems Engineering KW - Software SN - 2079-8954 TI - Methodology for Certification-Compliant Effect-Chain Modeling VL - 11 ER - TY - GEN AU - Tonbul, Güldeniz AU - Kappler, Julian AU - Murugan, Saravanakumar AU - Schoch, Roland AU - Nowakowski, Michal AU - Lange, Pia AU - Bauer, Matthias AU - Buchmeiser, Michael R. ID - 44380 TI - Characterization of Na-S Battery System Using X-ray Absorption Spectroscopy ER - TY - CONF AB - The development of autonomous vehicles and their introduction in urban traffic offer many opportunities for traffic improvements. In this paper, an approach for a future traffic control system for mixed autonomy traffic environments is presented. Furthermore, a simulation framework based on the city of Paderborn is introduced to enable the development and examination of such a system. This encompasses multiple elements including the road network itself, traffic lights, sensors as well as methods to analyse the topology of the network. Furthermore, a procedure for traffic demand generation and routing is presented based on statistical data of the city and traffic data obtained by measurements. The resulting model can receive and apply the generated control inputs and in turn generates simulated sensor data for the control system based on the current system state. AU - Link, Christopher AU - Malena, Kevin AU - Gausemeier, Sandra AU - Trächtler, Ansgar ID - 44390 KW - Traffic Simulation KW - Traffic Control KW - Car2X KW - Mixed Autonomy KW - Autonomous Vehicles KW - SUMO KW - Sensor Simulation KW - Traffic Demand Generation KW - Routing KW - Traffic Lights KW - Graph Analysis KW - Traffic Observer SN - 978-989-758-652-1 T2 - Proceedings of the 9th International Conference on Vehicle Technology and Intelligent Transport Systems TI - Simulation Environment for Traffic Control Systems Targeting Mixed Autonomy Traffic Scenarios ER - TY - CONF AU - Althaus, Maike AU - Müller, Michelle AU - Vorbohle, Christian AU - Kundisch, Dennis ID - 44444 T2 - Proceedings of the International Conference on Challenges in Managing Smart Products and Services (CHIMSPAS 2023) TI - Business Models for Cultural Event Platforms – A Taxonomy Approach ER - TY - CONF AU - Laux, Florian AU - Poniatowski, Martin AU - Kundisch, Dennis ID - 44053 T2 - Proceedings of the 31st European Conference on Information Systems (ECIS) TI - May I have your Attention, please? – The Interaction between Attention Screening and Reputation on Crowdworking Platforms ER - TY - GEN AU - Neukötter, Moritz AU - Jesinghausen, Steffen AU - Schmid, Hans-Joachim ID - 44103 TI - Particles as Seeds for Instabilities in Uniaxially Elongated Polymer Suspension Filaments (Presentation) ER - TY - JOUR AU - Küster, Christine AU - Klünder, Nina AU - Wagenknecht, Inga ID - 44477 JF - Hauswirtschaft und Wissenschaft SN - 2626-0913 TI - Haushaltswissenschaft – Eine Diskussionsgrundlage VL - 71 ER - TY - CHAP AU - Meine, Sabine AU - Otto, Arnold AU - Süßmann, Johannes ID - 35063 SN - 978-3-8260-7218-5 T2 - Musiklandschaften zwischen Rhein und Weser. Pluralisierung und Verflechtung entlang des Hellwegs in der Frühen Neuzeit. Unter Mitarbeit v. Markus Lauert TI - Musiklandschaften zwischen Rhein und Weser – Einführung ER - TY - CONF AU - Gharibian, Sevag AU - Watson, James AU - Bausch, Johannes ID - 20841 T2 - Proceedings of the 40th International Symposium on Theoretical Aspects of Computer Science (STACS) TI - The Complexity of Translationally Invariant Problems beyond Ground State Energies VL - 254 ER - TY - GEN AB - Extending the notion of maxcut, the study of the frustration index of signed graphs is one of the basic questions in the theory of signed graphs. Recently two of the authors initiated the study of critically frustrated signed graphs. That is a signed graph whose frustration index decreases with the removal of any edge. The main focus of this study is on critical signed graphs which are not edge-disjoint unions of critically frustrated signed graphs (namely non-decomposable signed graphs) and which are not built from other critically frustrated signed graphs by subdivision. We conjecture that for any given k there are only finitely many critically k-frustrated signed graphs of this kind. Providing support for this conjecture we show that there are only two of such critically 3-frustrated signed graphs where there is no pair of edge-disjoint negative cycles. Similarly, we show that there are exactly ten critically 3-frustrated signed planar graphs that are neither decomposable nor subdivisions of other critically frustrated signed graphs. We present a method for building non-decomposable critically frustrated signed graphs based on two given such signed graphs. We also show that the condition of being non-decomposable is necessary for our conjecture. AU - Cappello, Chiara AU - Naserasr, Reza AU - Steffen, Eckhard AU - Wang, Zhouningxin ID - 44501 T2 - arXiv:2304.10243 TI - Critically 3-frustrated signed graphs ER - TY - JOUR AU - Tapio, Kosti AU - Kielar, Charlotte AU - Parikka, Johannes M. AU - Keller, Adrian AU - Järvinen, Heini AU - Fahmy, Karim AU - Toppari, J. Jussi ID - 42517 JF - Chemistry of Materials KW - Materials Chemistry KW - General Chemical Engineering KW - General Chemistry SN - 0897-4756 TI - Large-Scale Formation of DNA Origami Lattices on Silicon VL - 35 ER - TY - JOUR AU - Pothineni, Bhanu Kiran AU - Keller, Adrian ID - 42518 JF - Advanced NanoBiomed Research KW - General Medicine SN - 2699-9307 TI - Nanoparticle‐Based Formulations of Glycopeptide Antibiotics: A Means for Overcoming Vancomycin Resistance in Bacterial Pathogens? VL - 3 ER - TY - JOUR AU - Hanke, Marcel AU - Tomm, Emilia AU - Grundmeier, Guido AU - Keller, Adrian ID - 44503 JF - ChemBioChem KW - Organic Chemistry KW - Molecular Biology KW - Molecular Medicine KW - Biochemistry SN - 1439-4227 TI - Effect of Ionic Strength on the Thermal Stability of DNA Origami Nanostructures ER - TY - JOUR AU - Linko, Veikko AU - Keller, Adrian ID - 44504 JF - Small KW - Biomaterials KW - Biotechnology KW - General Materials Science KW - General Chemistry SN - 1613-6810 TI - Stability of DNA Origami Nanostructures in Physiological Media: The Role of Molecular Interactions ER -