@phdthesis{Thema, author = {Thema, Martin Jiř{\´i}}, title = {Process optimization for microbial biosynthesis of methane in a trickle-bed reactor for Power-to-Gas applications: the ORBIT-process}, isbn = {978-3-8440-7656-1}, url = {http://nbn-resolving.de/https://nbn-resolving.org/urn:nbn:de:bvb:29-opus4-150567}, pages = {XVIII, 211}, abstract = {This thesis identifes Power-to-Gas in general and biological CO2-methanation in trickle-bed reactors in particular as promising energy storage and sector coupling technology ready for application but with further optimization potential. It reviews the global status and development of Power-to-Gas technology as to be of exponentially growing importance in energy systems changing towards renewable power supply and analyzes optimization and standardization potential for biological CO2-methanation in tricklebed reactors deriving an improved methanation process. Process development and experiments on hydrodynamical and biological improvement of such a setup were performed, leading to an optimized combination of a packing and microorganisms in pure culture embedded in the new ORBIT-process. First experimental results give evidence of successful application of different optimization approaches implemented in a technical center scale setup.}, language = {en} } @phdthesis{Stadler, author = {Stadler, Sebastian Rudolf Johann}, title = {The integration of virtual reality into the design process}, url = {http://nbn-resolving.de/https://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:91-diss-20211103-1612177-1-3}, pages = {VIII, 205}, abstract = {Technological advances strive towards automation and digitalization with the aim to increase efficiency in terms of decreased costs and product development time, resulting in shorter product life cycles. As this causes industries to release products more frequently and more quickly, industrial designers face problems in developing more complex systems in a decreased amount of time while aiming to meet individualized user requirements and stakeholder demands. If prototypes are infeasible or unaffordable, a successful market implementation of products is jeopardized. As design history proves, the introduction of new technologies to the profession of design has the potential to revolutionize the way of working for industrial designers. Virtual Reality may be one of these revolutions, as Computer-Aid Design has been in the 1980s. The present dissertation investigates the integration of Virtual Reality and its impact on the design process, the respective design method, but also the designer and design as a profession. After defining industrial design and Virtual Reality, a basic framework is proposed that describes a design process consensus model, the transfer of conventional design methods into VR, as well as a preliminary set of criteria for evaluating design studies. Based on this framework, four research questions are defined that initiate the investigation of how Virtual Reality can impact the design process, design methods, the role of designers, and design as a profession. To allow this, a refined set of criteria for evaluating design studies is developed and a benchmark study is conducted that proves the suitability for using Virtual Reality in the chosen context. Subsequently, five design studies are conducted in the field of autonomous mobility for public transport in Singapore to investigate the previously defined questions. The five design methods that are combined with Virtual Reality are heuristic evaluation, surveys, Computer-Aided Design prototyping, usability testing, and product presentation. For each design study, the development of the VR apparatus as well as the data collection and test of the method is explained. Additionally, two conventional design methods are consulted for a subsequent comparative analysis of each VR methods. Beyond the definition of the refined evaluation criteria, consisting of safety, validity, time and cost, variability, interactivity, immersion, and effort, the suitability of using VR for behavioural observation in the present application domain is confirmed. Based on the present investigations, the Virtual Design Toolbox is presented. The toolbox consists of five method cards that explain the usage of Virtual Reality for industrial designers throughout the product development and function as support for successfully developing and applying design methods utilizing this technology. The case studies prove that the usage of Virtual Reality has the potential to impact the design process, as divergent thinking and convergent thinking is fostered through valid data collection, decreased time- and cost- involvement, and increased variability. The roles of the involved designers throughout all design studies shifted from being concept creators towards coordinators and facilitators. Implications are derived on different levels, starting with the technology of Virtual Reality that could be a future game changer for research and design, followed by increased motivation to participate in design studies, the need for interdisciplinary teams to establish the required expertise, and lastly integration of Virtual Reality in design education. The usage of Virtual Reality in design will not replace conventional design methods but has the potential to lead to a paradigm shift for the whole profession of design.}, language = {en} } @misc{AppeltFautz, author = {Appelt, Andreas and Fautz, Anna}, title = {Optimierung Offenporiger Asphalte f{\"u}r Geh- und Radwegbereiche unter dem Aspekt der Schwammstadt}, address = {Regensburg}, pages = {47}, abstract = {Ans{\"a}tze zur planerische und bautechnische Optimierungen von inner{\"o}rtlichen Geh- und Radwegen mit Einsatz von Offenporigen Asphalten unter dem Aspekt der Schwammstadt}, language = {de} } @misc{OPUS4-7895, title = {Production Scheduling and Planning in Manufacturing Systems}, series = {Systems}, volume = {2025}, journal = {Systems}, editor = {Herrmann, Frank}, publisher = {MDPI}, address = {Basel}, issn = {2079-8954}, language = {en} } @misc{LehrerStockerDuddecketal., author = {Lehrer, Tobias and Stocker, Philipp and Duddeck, Fabian and Wagner, Marcus}, title = {Parametric CAD Models to Create an Infinite Number of Structural U-Shaped Sheet Metal Geometries [Data set]}, doi = {10.5281/ZENODO.14191374}, abstract = {The U-Channel Software is a python package containing four parametric models of U-shaped Sheet metals. The parameters refer to geometric dimensions, angles, fillet radii. Using the models, one can generate an infinite number of U-shaped sheet metal geometries, e.g. as STEP files. The parametric models are inspired by real-world shapes. A feasibility check is provided to ensure plausiblity of the shapes. Further features of the code are creating images of the geometries and generating geometries and images in parallel. For more details, refer to the repository and associated publications.}, language = {en} } @inproceedings{RauchBruecklEngel, author = {Rauch, Johannes and Br{\"u}ckl, Oliver and Engel, Bernd}, title = {Optimal Reactive Power Planning by covering deficient voltage demands with additional reactive power sources using a sensitivity approach}, series = {NEIS 2023 : Conference on Sustainable Energy Supply and Energy Storage Systems, Hamburg, September 4 - 5, 2023}, booktitle = {NEIS 2023 : Conference on Sustainable Energy Supply and Energy Storage Systems, Hamburg, September 4 - 5, 2023}, editor = {Schulz, Detlef,}, publisher = {VDE Verlag}, address = {Berlin}, isbn = {978-3-8007-6134-0}, pages = {223 -- 230}, abstract = {The determination of the optimal location, types and size of additional required reactive power sources is a main interest of Reactive Power Planning (RPP) investigations and of this paper. The planning problem addresses the maintenance of voltage stability, which is an ancillary service in Germany, and can be formulated as a mixed-integer optimization prob-lem. The aim of this work is a techno-economically efficient coverage of the deficient steady state voltage deviation demands (VDD) by placing new reactive power sources with adequate size or extending the reactive power potential of existing sources. An optimization model is set up to solve the planning problem by using load flow voltage sensitivities, which quantify and evaluate the technical efficiency of new reactive power sources in relation to the present voltage deviation demands. Operating and investment costs are used as economic decision parameters. Within an application example, which is carried out with an exemplary transmission system, the solution of the planning problem is discussed.}, language = {en} } @inproceedings{HinterreiterBruecklRauch, author = {Hinterreiter, Marion and Br{\"u}ckl, Oliver and Rauch, Johannes}, title = {Challenges and Approaches for Long-Term Reactive Power Forecasting in Power Systems}, series = {PESS 2025 - IEEE Power and Energy Student Summit, October 08 - 10, 2025 in Munich, Germany}, booktitle = {PESS 2025 - IEEE Power and Energy Student Summit, October 08 - 10, 2025 in Munich, Germany}, editor = {Technische Universit{\"a}t M{\"u}nchen,}, publisher = {VDE Verlag}, isbn = {978-3-8007-6656-7}, pages = {109 -- 114}, abstract = {The transition from fossil fuels to renewable energy sources is driving profound changes across all voltage levels of the electrical grid, altering active power (P) as well as reactive power (Q) behavior. This transformation involves a shift from predominantly top-down, unidirectional electricity flows to bidirectional and increasingly complex flow patterns, fundamentally altering the operation and utilization of power systems. Many countries are already reporting notable changes in their transmission grid Q. This can lead to increased costs for grid expansion and compensation equipment, as well as grid losses. To minimize these losses and ensure grid stability and efficiency, understanding and forecasting Q long-term becomes essential. This paper addresses the challenges of long-term (1-20 years) Q forecasting in general by analyzing Q behavior in grids, the main influencing grid parameters, and reviewing existing forecasting approaches. It evaluates the applicability of these approaches and highlights current research gaps and trends. By focusing on this underexplored area, the paper aims to support the development of more advanced and reliable long-term Q forecasting techniques.}, language = {en} } @inproceedings{HinterreiterBruecklRauch, author = {Hinterreiter, Marion and Br{\"u}ckl, Oliver and Rauch, Johannes}, title = {Methodology for long-term reactive power forecasts of medium-voltage grids}, series = {NEIS 2025 : Conference on Sustainable Energy Supply and Energy Storage Systems, Hamburg, September 15 - 16, 2025}, booktitle = {NEIS 2025 : Conference on Sustainable Energy Supply and Energy Storage Systems, Hamburg, September 15 - 16, 2025}, editor = {Schulz, Detlef}, publisher = {VDE Verlag}, isbn = {978-3-8007-6633-8}, pages = {218 -- 223}, abstract = {Understanding and assessing the long-term behavior of reactive power is crucial for power system planning and invest-ment decisions. This is particularly growing relevant for the lower voltage-grid levels, which are gaining importance due to significant changes in grid behavior, operational strategies, energy generation and consumption patterns. Currently, standardized methodologies for forecasting reactive power in medium-voltage grids are lacking, creating a gap in research and practical applications. To optimize grid investments and expansions, informed decisions based on reliable research and accurate forecasts are essential. This paper presents a methodology for long-term reactive power forecasting in me-dium-voltage grids, introducing a new approach to account for low- and medium-voltage grid interactions while address-ing common challenges like limited available grid data and scenario framework definition. The aim of the forecast is the future reactive power behaviour of a medium-voltage-grid at the high-voltage side of the high-voltage to medium-voltage transformer. The medium-voltage-level is modelled using a grid model approach, while low-voltage grids are being mod-elled using generic distribution grids. A 209-bus medium-voltage-grid model is used as an application example and to provide two exemplary use cases for a reactive power forecast for 2045.}, language = {en} } @inproceedings{StadlerKrausBrueckl, author = {Stadler, Andreas and Kraus, Hermann and Br{\"u}ckl, Oliver}, title = {Proposing an Optimization Model for a techno-economic Evaluation of Energy Storage Systems}, series = {PESS 2025 - IEEE Power and Energy Student Summit, October 08 - 10, 2025 in Munich, Germany}, booktitle = {PESS 2025 - IEEE Power and Energy Student Summit, October 08 - 10, 2025 in Munich, Germany}, editor = {Technische Universit{\"a}t M{\"u}nchen,}, publisher = {VDE}, isbn = {978-3-8007-6656-7}, pages = {97 -- 102}, abstract = {During the global energy crisis in 2022, electricity prices increased drastically. This lead, together with an overall higher price volatility to possibly higher electrical energy storage system (ESS) profitability. To test if the investment in an ESS can now be more profitable, an approach for a techno-economic evaluation of ESS is presented in this paper, using an optimization algorithm to determine the optimal way of covering a load flow profile with electricity trading products on the electricity market with and without the use of an energy storage system. The cost differences between using or not using the storage system are assumed to be the profits of the ESS, which must exceed the (interest-bearing) investment costs over its lifetime. The correct way of operation of the optimization model is validated and several storage sizes and capacities as well as several years of the electricity market data was analyzed, once with a perfect forecast of all prices of the electricity trading products and once with a forecast based on the previous years purchasing strategy. The results show that, using the prognosis and a 2 \% p.a. interest rate, only the storage combinations for 2.5 MWh/ 2.5 MW and 1 MWh/ 1 MW show profitability in 2023, whereas 2017 and 2020 show no profitability.}, language = {en} } @inproceedings{UhlSchamelAchhammeretal., author = {Uhl, Julius and Schamel, Marco and Achhammer, Anton and Sterner, Michael}, title = {Sustainable Steel Production in the Desert: Economic and Technical Assessment of a Hydrogen-Powered Steel Plant in Mauritania}, series = {2025 IEEE PES/IAS PowerAfrica, 28 September - 02 October 2025, Cairo}, booktitle = {2025 IEEE PES/IAS PowerAfrica, 28 September - 02 October 2025, Cairo}, publisher = {IEEE}, doi = {10.1109/PowerAfrica65840.2025.11289120}, pages = {6}, abstract = {The global steel industry is a major contributor to climate change and faces challenges in achieving a carbon-neutral production, hinging on the availability of cost-effective hydrogen produced by renewable energy. Mauritania, with its exceptional solar and wind resources, offers some of the most competitive conditions globally for hydrogen production. Instead of focusing on hydrogen exports, this study explores the technical feasibility and economic viability of establishing a renewable-powered steel plant in Mauritania, utilizing the country's abundant iron ore reserves. The findings suggest that sustainably produced steel in Mauritania could be cost-competitive with current European prices. With ongoing declines in investment costs for emerging renewable technologies, Mauritania has the potential to become one of the world's most cost-effective steel producers.}, language = {en} } @article{SittlMarburgDeckersetal., author = {Sittl, Christopher and Marburg, Steffen and Deckers, Elke and Wagner, Marcus}, title = {Model order reduction for unbounded second-order vibroacoustic systems using infinite elements and Dirichlet-to-Neumann map}, series = {Computer Methods in Applied Mechanics and Engineering}, volume = {453}, journal = {Computer Methods in Applied Mechanics and Engineering}, publisher = {Elsevier}, doi = {10.1016/j.cma.2026.118846}, pages = {22}, abstract = {This work addresses the efficient numerical simulation of time-harmonic vibroacoustic problems in unbounded domains, with a focus on fluid-structure interaction. The underlying mathematical model is a second-order dynamical system arising from the coupling of structural and acoustic domains, incorporating material damping effects, relevant in structural acoustics and noise control applications. A central novelty of the proposed method is its unified computational framework that supports two distinct strategies for treating unbounded fluid domains: (1) non-local absorbing boundary conditions based on Dirichlet-to-Neumann map, and (2) infinite elements, which extend the computational domain rather than truncate it. Both approaches are integrated into a consistent formulation that enables flexible and accurate modeling of exterior wave propagation. To efficiently evaluate frequency-domain transfer functions, the method employs model order reduction using the Pad{\´e}-via-Lanczos technique. While this algorithm typically targets first-order systems, the present approach uses a Schur complement strategy to reduce the second-order system in a way that maintains computational efficiency and storage requirements comparable to first-order formulations. Importantly, the framework seamlessly embeds both interior structural damping and the additional dissipation introduced by the acoustic-domain truncation into the model-order reduction process. The exterior acoustic field is represented via spherical harmonic expansions, with expansion coefficients computed from the reduced system. Numerical results demonstrate the method's accuracy, efficiency, and scalability, making it well-suited for high-fidelity vibroacoustic analysis in unbounded domains.}, language = {en} } @book{FinckhKreutzEberth, author = {Finckh, Wolfgang and Kreutz, Johannes and Eberth, Florian}, title = {Br{\"u}ckenverst{\"a}rkung mit geklebter Bewehrung}, publisher = {Springer Vieweg}, address = {Wiesbaden}, isbn = {9783658492571}, doi = {10.1007/978-3-658-49258-8}, pages = {XVII, 317}, abstract = {Dieses Buch widmet sich der Verst{\"a}rkung von Stahlbeton- und Spannbetonbr{\"u}cken mit geklebter Bewehrung. Dazu werden zun{\"a}chst die verschieden Verst{\"a}rkungsgr{\"u}nde f{\"u}r Br{\"u}cken sowie deren Beanspruchungsarten vorgestellt. Danach werden die Anwendungsm{\"o}glichkeiten der geklebten Bewehrung vorgestellt und die rechnerischen Herausforderungen sowie der L{\"o}sungsm{\"o}glichkeiten erl{\"a}utert. Im n{\"a}chsten Kapitel wird vertieft auf die rechnerischen Besonderheiten von Spannbetonverst{\"a}rkungen mit geklebter Bewehrung eingegangen. Da f{\"u}r die Verbundnachweise der geklebten Bewehrung im Br{\"u}ckenbau einen Betriebsfestigkeit notwendig ist, wird dieser zun{\"a}chst am Stahlbetonbauteil erl{\"a}utert. Danach werden die erforderlichen Erm{\"u}dungsnachweise f{\"u}r aufgeklebte und eingeklebte Bewehrung im Br{\"u}ckenbau behandelt. Abschließend wird noch ein Verfahren vorgestellt, wie spannungsrisskorrosionsgef{\"a}hrdete Bauteile verst{\"a}rkt werden k{\"o}nnen. Die im Buch vorgestellten theoretischen Grundlagen werden anhand zahlreicher Abbildungen verdeutlicht. Zu jedem Thema sind zum besseren Verst{\"a}ndnis umfangreiche Bemessungsbeispiele mit Praxisbezug enthalten.}, language = {de} } @book{Finckh, author = {Finckh, Wolfgang}, title = {Mit Stabwerkmodellen zur Bewehrungsf{\"u}hrung: Detailnachweise im Stahlbetonbau}, series = {erfolgreich studieren}, journal = {erfolgreich studieren}, edition = {2. Auflage}, publisher = {Springer Fachmedien}, address = {Wiesbaden}, isbn = {9783658488550}, issn = {2524-8693}, doi = {10.1007/978-3-658-48856-7}, pages = {XIV, 465}, abstract = {Aufbauend auf den Grundlagen des Stahlbetonbaus wird in diesem Lehrbuch das Konzept der Bemessung von Stahlbetonkonstruktionen mittels Stabwerkmodellen erl{\"a}utert. Dieses Bemessungskonzept wird insbesondere im Bereich der Detailnachweise und bei gedrungenen Tragwerken im Stahlbetonbau ben{\"o}tigt. Neben der generellen Modellbildung und Nachweismethodik werden auch die {\"u}blichen Modelle und Nachweise f{\"u}r h{\"a}ufig vorkommende Details vorgestellt. Hierbei werden insbesondere Krafteinleitungsbereiche, Konsolen, ausgeklinkte Auflager, Rahmenknoten, Querschnittsspr{\"u}nge, Tr{\"a}ger{\"o}ffnungen, Wandartige Tr{\"a}ger, K{\"o}cherfundamente und Pfahlkopfplatte detailliert behandelt. Die im Lehrbuch vorgestellten theoretische Grundlagen werden anhand zahlreicher Abbildungen erl{\"a}uterten. In jedem Kapitel sind zum besseren Verst{\"a}ndnis umfangreiche Bemessungsbeispiele mit Praxisbezug enthalten.}, language = {de} } @article{SchiekSolntsevNeshev2025, author = {Schiek, Roland and Solntsev, Alexander S. and Neshev, Dragomir N.}, title = {Measurement of the cubic nonlinear susceptibility in lithium niobate}, series = {Optical Materials Express}, volume = {15}, journal = {Optical Materials Express}, number = {5}, publisher = {Optica Publishing Group}, issn = {2159-3930}, doi = {10.1364/OME.557516}, pages = {1100 -- 1117}, year = {2025}, abstract = {We measured the cubic nonlinear susceptibility tensor elements ( χ(3)) for polarization along the primary crystallographic axis in titanium-indiffused lithium niobate waveguides, assessed through self-phase modulation using picosecond-duration pulses at telecommunication wavelengths. A dominant, highly temperature- and wavelength-dependent contribution from a cascaded second-order nonlinearity is observed. Through careful extraction of the cascaded effect, we quantify the intrinsic third-order susceptibility tensor elements as χ(3) zzzz(ω; ω, ω, -ω) = (5.2 ± 1.3) × 10-21 m2 V2 and χ(3) xxxx(ω; ω, ω, -ω) = χ(3) yyyy(ω; ω, ω, -ω) = (3.6 ± 0.8) × 10-21 m2 V2 . These measurements underscore the substantial impact of the cascaded nonlinearity in enhancing the effective cubic nonlinearity in lithium niobate and offer precise values essential for the design of nonlinear photonic devices.}, language = {en} } @article{LinnerdeSotoElMahdyetal., author = {Linner, Thomas and de Soto, Borja Garc{\´i}a and El-Mahdy, Deena and Gonzalez, Vicente A.}, title = {Topical collection: robotic solutions for digitally enabled production processes in construction}, series = {Construction Robotics}, volume = {10}, journal = {Construction Robotics}, publisher = {Springer}, issn = {2509-811X}, doi = {10.1007/s41693-025-00174-w}, pages = {1}, abstract = {Across the global construction sector, a new generation of robotic systems is rapidly entering the market. Solutions for on-site drilling, spraying, masonry, logistics, and finishing are now being piloted at an unprecedented pace. Their deployment in emerging construction robotics hubs in Singapore, Hong Kong, Canada, Dubai, Abu Dhabi, Egypt, Denmark, Switzerland, and Germany demonstrates both the momentum of this technological shift and the considerable challenges that remain. In real-world testing environments, the integration of these robots into digital construction pipelines—particularly BIM-to-robot workflows, semantic task modeling, and robust digital twins—continues to be a bottleneck. These challenges position digitally enabled fabrication and robotics as a priority topic within academia, motivating research on methods, techniques, algorithms, and workflows that can accelerate adoption in construction. This Topical Collection brings together research spanning the emerging landscape of digitally enabled construction robotics. The contributions advance robotic fabrication, from flexible timber processes to innovative formwork, reinforcement, and earth-based additive methods, alongside computer vision, BIM integration, and sensing approaches that improve monitoring and quality assurance. The collection also includes mobile and aerial systems for inspection and mapping to support system autonomy in construction. Together, these works show how integrated perception, planning, and sociotechnical understanding of human-robot collaboration are becoming essential for reliable robotic performance in construction. While current construction robots still focus on simple, structured tasks, the advances in this topical collection point toward a more capable generation. Contributions outline principles for robot-compatible buildings through new fabrication logics and BIM-linked task data, while work on perception, BIM integration, and data fusion reduces interoperability gaps. Research on sensing and adaptive processes supports more consistent workflows, and mobile and aerial robotics provide insights for deployment and site logistics. Collectively, these developments show how digitally enabled production processes can help to overcome key systemic barriers and enable future, scalable construction robotics.}, language = {en} } @article{WeindlerDawoud, author = {Weindler, Jeremy and Dawoud, Belal}, title = {Experimental investigation of a small-scale continuous flow ohmic heating reactor for a highly effective conversion of renewable electricity surpluses into heat}, series = {Applied Thermal Engineering}, volume = {242}, journal = {Applied Thermal Engineering}, publisher = {Elsevier}, issn = {1359-4311}, doi = {10.1016/j.applthermaleng.2024.122401}, pages = {15}, abstract = {Sector coupling is expected to play a decisive role as a key technology to realize the energy transition towards green energy supply. This work introduces, therefore, a comprehensive experimental study on a new power-to-heat system based on the continuous-flow, ohmic heating principle, which aims at utilizing renewable electricity in green processes. The ohmic heating technology, which is widely applied in the food industry, has been adapted and evaluated for delivering heat and domestic hot water to a single-family house. The introduced prototype is designed to convert renewable electricity into heat in the power range between 1000 and 3000 W with a typical electrical household installation (230 V, 50 Hz and 16 A fuse). A dedicated test rig has been developed and a comprehensive experimental campaign has been carried out to investigate the performance of the introduced system under typical operating conditions of a single-family house. Both the conversion efficiency and the dynamics of the thermal response of the introduced system have been assessed. It turned out that, the temperature lift between the return and supply of the reactor, and consequently, the conversion efficiency of electrical into thermal energy, are independent on the return temperature, for a fixed value of the volume flow rate of the electrolyte solution. A remarkable steady-state conversion efficiency of 97.5\% has been measured. In addition, the dynamic response of the ohmic heating system has been found to be strongly dependent on the desired temperature lift. By an implemented controller, 95\% of the steady state temperature lift of 44.5 K can be realized in 50 s, which marks an exceptionally rapid thermal response. The obtained results pave the way towards a field test study of the developed technology in a real household installation as well as to extend the focus on new fields such as green chemical processes.}, language = {en} } @article{WeindlerLehnerEcksteinetal., author = {Weindler, Jeremy and Lehner, Hannes and Eckstein, J. and Dawoud, Belal}, title = {Performance assessment of a green hydrogen-based household energy system supported by a battery storage at different resolutions of the electrical load profile}, series = {International Journal of Hydrogen Energy}, volume = {144}, journal = {International Journal of Hydrogen Energy}, publisher = {Elsevier}, issn = {0360-3199}, doi = {10.1016/j.ijhydene.2025.04.431}, pages = {30 -- 41}, abstract = {Hydrogen deems quite suitable for medium- and long-term energy storage of surplus renewable electricity. Nowadays, all-in-one solutions consisting of an electrolyzer, a compressor, pressurized hydrogen storage tanks, a fuel cell (FC) and the necessary peripheral components are available for single family houses. This work presents a comparative assessment of the system's key performance indicators in a household system with three market available FCs with the nominal powers of 0.8, 1.4 and 7.8 kW. The design tool developed for the assessment of the hybrid energy system along with two energy management system configurations are introduced. An electrochemical and thermal model widely applied in the literature is used to model the FCs, which is validated against the available experimental data in the literature for all three FCs. The influence of the FCs' nominal power, their power dynamic operation range, the use of a battery storage with different capacities and the load profile's resolution have been technically assessed regarding the system's self-sufficiency (SS), the FC's efficiency, full-load operating hours, and number of on/off cycles. It turned out that, the system performance is strongly dependent on the nominal power of the FC and its power dynamic operation range. If no battery-storage is applied, the complete grid independence is not possible, and a high resolution of the load profile is indispensable in the assessment of the system design. A hybrid energy system comprising the 1.4 kW FC, a PV system of 10 kW peak power and a battery of 15 kW storage capacity showed a degree of SS of 98\%. The number of the full-load operating hours and on/off cycles of that FC amount to 768 and 116 cycles, respectively. Such promising results are referred to the high dynamic operation range of the battery, and its high discharge power capacity, which makes it more suitable to cover a remarkably higher fraction of the load deficit, if compared to a system without a battery.}, language = {en} } @misc{GutbrodRauberWeberNunesetal., author = {Gutbrod, Max and Rauber, David and Weber Nunes, Danilo and Palm, Christoph}, title = {OpenMIBOOD's classification models for the MIDOG, PhaKIR, and OASIS-3 benchmarks [Data set]}, doi = {10.5281/zenodo.14982267}, abstract = {These models are provided for evaluating post-hoc out-of-distribution methods on the three OpenMIBOOD benchmarks: MIDOG, PhaKIR, and OASIS-3. When using these models, make sure to give appropriate credit and cite the OpenMIBOOD publication.}, language = {en} } @misc{GutbrodRauberWeberNunesetal., author = {Gutbrod, Max and Rauber, David and Weber Nunes, Danilo and Palm, Christoph}, title = {Cropped single instrument frames subset from Cholec80 [Data set]}, doi = {10.5281/zenodo.14921670}, abstract = {This dataset is a subset of the original Cholec80 dataset and is used by the OpenMIBOOD framework to evaluate a specific out-of-distribution setting. When using this dataset, it is mandatory to cite the corresponding publication (OpenMIBOOD) and to follow the acknowledgement and citation requirements of the original dataset (Cholec80). The original Cholec80 dataset (associated paper,Homepage) consists of 80 cholecystectomy surgery videos recorded at 25 fps, performed by 13 surgeons. It includes phase annotations (25 fps) and tool presence labels (1 fps), with phase definitions provided by a senior surgeon. A tool is considered present if at least half of its tip is visible. The dataset categorizes tools into seven types: Grasper, Bipolar, Hook, Scissors, Clipper, Irrigator, and Specimen bag. Multiple tools may be present in each frame. Additionally, 76 of the 80 videos exhibit a strong black vignette. For this dataset subset, frames were extracted based on tool presence labels, selecting only those containing Grasper, Bipolar, Hook, or Clipper while ensuring that only a single tool appears per frame. To enhance visual consistency, the black vignette was removed by extracting an inner rectangular region, where applicable.}, language = {en} } @misc{Kriegl, author = {Kriegl, Raphael}, title = {Sessile droplet fitting (Version v1.0b) [Data set]}, doi = {10.5281/zenodo.7464158}, language = {en} } @techreport{FinckhAicher, author = {Finckh, Wolfgang and Aicher, Magdalena}, title = {Vergleich verschiedener Berechnungsverfahren von Pfahlkopfplatten}, address = {Regensburg}, doi = {10.35096/othr/pub-8870}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-88708}, pages = {IV, 61}, abstract = {Der Bericht besch{\"a}ftigt sich mit dem Vergleich verschiedener Berechnungsverfahren zur Bemessung von Pfahlkopfplatten. Im Rahmen eines konkreten Berechnungsbeispiels, werden das klassisch ebene Stabwerkmodell, ein r{\"a}umliches Stabwerkmodell und eine computergest{\"u}tzte Berechnungsmethode mittels der 3D-Detail-Anwendung von IDEA StatiCa angewendet und im Anschluss analysiert und miteinander verglichen. Die Ergebnisse zeigen, dass ebene Stabwerkmodelle auch bei r{\"a}umlichem Tragverhalten eine wirtschaftliche Bemessung erm{\"o}glichen k{\"o}nnen. Durch ihre idealisierten Annahmen eigenen sie sich besonders f{\"u}r eine effiziente Vorbemessung bei vergleichsweise geringem Aufwand. Demgegen{\"u}ber erfassen r{\"a}umliche Stabwerkmodelle den Kraftfluss deutlich pr{\"a}ziser, erlauben die realit{\"a}tsnahe Identifikation kritischer Beanspruchungszonen und ber{\"u}cksichtigen komplexe Tragmechanismen. Der erh{\"o}hte Modellierungsaufwand sowie die eingeschr{\"a}nkte normative Grundlage f{\"u}hren jedoch zu konservativen Annahmen, insbesondere bei der Bemessung r{\"a}umlicher Knotenbereiche. Mit der 3D-Detail-Anwendung bietet IDEA StatiCa ein sehr genaues, umfangreiches und norm-gerechtes Bemessungstool f{\"u}r Diskontinuit{\"a}tsbereiche. Die grafische Aufbereitung der Ergebnisse ist {\"u}bersichtlich gestaltet, jedoch bleiben die zugrundeliegenden Rechenschritte f{\"u}r den Anwender kaum nachvollziehbar. Da es sich um eine noch junge Software handelt, ist auch die Verf{\"u}gbarkeit von Fachinformation, insbesondere zur Fehlerdiagnose oder bei Anwendungsfragen, derzeit noch eingeschr{\"a}nkt. Insgesamt weisen alle untersuchten Methoden spezifische Vor- und Nachteile auf. Zum Zeitpunkt dieser Arbeit erscheint eine Kombination aus einer Vorbemessung mit ebener Stabwerkmodellen und eine anschließende r{\"a}umliche Bemessung mittels IDEA StatiCa als sinnvoll. F{\"u}r die wirtschaftliche Anwendung r{\"a}umlicher Stabwerkmodelle besteht weiterhin Entwicklungsbedarf, insbesondere hinsichtlich standardisierter Knotentypen und deren praktikabler Bemessung.}, language = {de} } @phdthesis{Paric, author = {Paric, Ivan}, title = {Erfassung und in situ Aussteuerung der rheologischen Eigenschaften von SVB}, address = {Bochum}, doi = {10.13154/294-10463}, url = {http://nbn-resolving.de/urn:nbn:de:hbz:294-104639}, pages = {XIII, 137}, abstract = {Diese Arbeit diskutiert den Einsatz eines neuen rheologischen Messsystems. Die rheologischen Untersuchungen finden unmittelbar nach der Herstellung im Mischer statt. Mischungen verschiedener SVB-Rezepturen wurden mit variierenden w/z-Werten hergestellt. Die einzelnen rheologischen Messergebnisse liefern aneinandergereiht Kennlinien. Solche Kennlinien erlauben die zahlenm{\"a}ßige Definition einer angestrebten Konsistenz. Zus{\"a}tzlich wurden Kennlinien mit Fließmitteln und Stabilisierern generiert. Diese Kennlinien bilden eine Art Wissensdatenbank f{\"u}r die untersuchte Rezeptur. Ein neu entwickelter Algorithmus kann die rheologischen Messwerte einer aktuellen Mischung mit der jeweiligen Wissensdatenbank vergleichen. Bei Abweichungen von der angestrebten Konsistenz berechnet das Aussteuerungssystem die Art und Menge einer zus{\"a}tzlich erforderlichen Komponente. Versuchsserien an SVBs mit abweichender Konsistenz belegen die erfolgreichen Aussteuerungen mit Wasser oder Zusatzmittel.}, subject = {Selbstverdichtender Beton}, language = {de} } @article{KrausKnipferJacobetal., author = {Kraus, Richard and Knipfer, Maximilian and Jacob, Matthias and Kienninger, Baerbel and Alikhani, Jasmine and Ghamsary, Parham Heydarzadeh and Reinker, Lukas and Adler, Ina and Dendorfer, Sebastian and Kieninger, Martin}, title = {Effectiveness and safety of techniques for cervical spine immobilization in mountain rescue}, series = {Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine}, volume = {34}, journal = {Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine}, publisher = {Springer}, doi = {10.1186/s13049-025-01530-z}, pages = {10}, abstract = {Background Cervical spine injuries in alpine sports require immediate immobilization at the site of the accident to avoid possible secondary damage caused by transportation. Using special sensor technology, this study investigated whether a cervical spine orthosis (cervical collar, Stifneck collar (Laerdal Medical GmbH, Puchheim, Germany)) provides greater stability than a vacuum mattress alone. Methods Using one male test person, we simulated transporting a patient with a spinal injury in steep alpine terrain. A wireless motion capture system (Xsens Technologies, Movella™ Inc., Henderson, USA) was used to record motion in three-dimensional space within a standardized environment. All tests were performed on a set course by the Bavarian Mountain Rescue Service. The test person lay on a mountain rescue stretcher and was immobilized with a vacuum mattress, either with or without a cervical orthosis. The axes of cervical spine movements were analyzed separately. Results There were no significant differences between immobilization with and without a cervical orthosis with regard to lateral flexion (max. 3.7° compared to 3.0°) in the frontal plane and maximum excursion in flexion (max. 1.6° compared to 2.8°) or extension (max. -1.6° compared to -1.7°). There was significantly greater rotation movement around the craniocaudal axis without an orthosis (max. 2.4° compared to 1.3°). Conclusion During mountain rescues, the cervical spine can be immobilized without a rigid cervical spine orthosis. Future research should explore the fundamental benefits of cervical spine immobilization, while the findings of this work contribute to the safe care of patients by avoiding the disadvantages associated with rigid cervical orthoses.}, language = {en} } @misc{MichelKrenkel, author = {Michel, Johanna and Krenkel, Lars}, title = {Experimental Investigation of Shear-Induced Generation of Respiratory Aerosol: Simultaneous Measurements of Particle Quantities and Wave Topology}, series = {2nd European Fluid Dynamics Conference (EFDC2), 26-29 August 2025, Dublin, Ireland}, journal = {2nd European Fluid Dynamics Conference (EFDC2), 26-29 August 2025, Dublin, Ireland}, doi = {10.35096/othr/pub-8859}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-88593}, pages = {1}, abstract = {Despite the high level of attention on infectious respiratory aerosol during the Covid19 pandemic, little is known about the processes how these particles form inside the respiratory system. Understanding the underlying fluid mechanical processes and their influencing factors would enable the development of drugs to suppress the generation of infectious aerosol. In the proposed work, we focus on the shear-induced mechanism of aerosol generation, which is supposed to occur mostly in the larger airways during coughing. In this process, high air velocities trigger Kelvin-Helmholtz waves in the mucus film, which lines the air vessels. Through a series of instabilities, particles detach from the crest of these waves. In the proposed work, we investigate the process of shear-induced aerosol generation in idealized experiments where we vary the air-flow characteristics and the properties of the mucus fluid. Our central aim here is to deduct an empirical model of the quantity and size distribution of generated particles depending on the mucus rheology and the local shear flow. Further, we observe the wave topology to better understand the coupling between the air flow and the waves. In our experimental setup, we measure the quantity of created particles and the emerging waves simultaneously. To ensure controllable conditions, we simplify the complex flow conditions in the airways. We use a rectangular channel with the bottom wall covered in a mucus mimetic. The mucus mimetic fluid is a synthetic hydrogel developed to recreate the viscoelastic properties and low surface tensions of the mucus. Filtered pressurized air is guided through the channel to trigger shear-induced aerosol generation. After passing the mucus mimetic, the air enters into a collection chamber from where particles are sampled continuously by an aerosol spectrometer. To measure wave topology, we use planar laser induced fluorescence. For this, we stain the mucus mimetic with fluorescent dyes and illuminate a line on the surface of the fluid film with a 532 nm laser. A high-resolution camera captures the resulting fluorescent glow of the mucus mimetic. Figure 1 presents exemplary wave topology results from the experiments, employing varying air flow volume rates, mucus mimetic gel properties, and different configurations of the laser and camera. The resulting wave topologies exhibit significant variation. For the conference, we will conduct parameter studies of the particle quantities and wave topology while varying the mucus mimetic properties and the flow rate of the air. Additionally, we will present grid projection-based techniques to extend the single-line wave measurements and asses the entire surface of the mucus film.}, language = {en} } @inproceedings{GalkaStrassburgerLangetal., author = {Galka, Stefan and Strassburger, Steffen and Lang, Sebastian and Reggelin, Tobias}, title = {Introduction to the Minitrack on Simulation Modeling and Digital Twins for Decision Making in the Age of Industry 4.0}, series = {Proceedings of the 57th Hawaii International Conference on System Sciences (HICSS), January3-6, 2024, Honolulu, Hawaii}, booktitle = {Proceedings of the 57th Hawaii International Conference on System Sciences (HICSS), January3-6, 2024, Honolulu, Hawaii}, editor = {Bui, Tung}, publisher = {ScholarSpace}, isbn = {978-0-9981331-7-1}, doi = {10.24251/HICSS.2024.206}, pages = {1647 -- 1648}, abstract = {The minitrack contains contributions with a focus on simulation modeling and digital twins and decision making in the context of Industry 4.0. The use of simulation models and digital twins is manifold, from planning to virtual commission and real-time operational decision support. Cyber-physical systems integrate the real world and the virtual world to enable decision making in the age of Industry 4.0. For example, customer decisions and supply disruptions which directly influence manufacturing and logistics systems require immediate decisions. Thus, models must have the capability to support decision making in manufacturing as well as in internal and external logistics in real-time. Methods include discrete-event simulation, discrete-rate simulation, hybrid simulation, system dynamics simulation, the combination of simulation modeling with machine learning or optimization heuristics, prescriptive analytics, and adaptive systems. Furthermore, this minitrack addresses simulation education and simulation models used for education and training in manufacturing and logistics.}, language = {en} }