Publications
Now showing items 161-240 of 466
Referenzarchitekturmodell für Experience Management
(2024)
The recording and analysis of individual experience worlds via digital feedback communication offers new opportunities. In conjunction with the reconstruction of associated digital event chains, a customer's experience ...
Steigerung der thermischen Stabilität von warm- und kaltgewalztem Wolfram durch Kalium-Dotierung für die Fusionsenergietechnik
(2025)
Cold-rolled tungsten with high degrees of deformation exhibits exceptionally high ductility. However, the required ultra-fine-grained microstructure is thermally unstable. A promising stabilization approach is offered by ...
Analyse von Störungen und Dispositionen im ÖPNV
(2025)
In this work, disruptions and dispositions in public transport are analysed using different methods. Interviews and observations are conducted within control centres and data from the ITCS is analysed. From this, influencing ...
Der Spröd-duktil-Übergang in ultrafeinkörnigem Wolfram
(2023)
High brittle-ductile transition temperatures preclude the use of conventionally manufactured tungsten (W) as a structural material. Ultrafine grained (UFG) W materials, however, exhibit the brittle-ductile transition at ...
Optimizing photocatalysts and photoreactors for solar fuel synthesis
(2023)
The work represents a toolbox for the design of a highly efficient photocatalytic process for solar-driven synthesis. The focus is the optimization of photoreactors and photocatalysts. The described photoreactor design ...
Power Generation by Resonant Self-Actuation
(2023)
Research into micro energy harvesting systems has been driven by the need for self-sustaining, stable power sources for interconnected wireless sensors. Waste heat, particularly at temperatures below 200 °C, presents a ...
Deep material networks for efficient scale-bridging in thermomechanical simulations of solids
(2023)
We investigate deep material networks (DMN). We lay the mathematical foundation of DMNs and present a novel DMN formulation, which is characterized by a reduced number of degrees of freedom. We present a efficient solution ...
Strengthening Resilience of Supply with Essential Goods through Public-Private Emergency Collaborations
(2023)
Companies can be valuable partners in delivering essential goods but must be appropriately motivated to participate in humanitarian crisis management. This work provides valuable insights into the status of humanitarian ...
Proceedings - 33. Workshop Computational Intelligence
(2023)
The workshop proceedings contain the contributions of the 33rd workshop "Computational Intelligence" which will take place from 23.11. - 24.11.2023 in Berlin. The focus is on methods, applications and tools for Fuzzy ...
Integrierte Projektabwicklung mit Mehrparteienverträgen
(2024)
In the context of IPA projects, project participants generally try to create a system that aligns the individual interests of the participants in such a way that opportunistic behavior of the participants does not have ...
Experimental investigation of relevant road surface descriptors for tire-road noise measurements on low-absorbing road surfaces
(2024)
Ihrer Arbeit in der Originalsprache: This work aims at identifying relevant road surface characteristics to mitigate tire-road noise of free-rolling tires using a systematic approach. As using open porous roads is already ...
Stabilität und Variabilität mobilitätsbezogener Alltagshandlungen – eine qualitative soziale Netzwerkanalyse
(2023)
In order to understand the potential for change and persistence in everyday mobility-related practices, this book highlights the importance of social relationships in people's lives, such as with friends and family members, ...
Modeling Backscattering Behavior of Vulnerable Road Users Based on High-Resolution Radar Measurements
(2023)
During the evolvement of autonomous driving technology, obtaining reliable 3-D environmental information is an indispensable task in approaching safe driving. The operational behavior of automotive radars can be precisely ...
Limited Information Shared Control and its Applications to Large Vehicle Manipulators
(2024)
This work focuses on the Limited Information Shared Control and its controller design using potential games. Through the developed systematic controller design, the experiments demonstrate the effectiveness and superiority ...
Dynamic Model-based Analysis of Oxygen Reduction Reaction in Gas Diffusion Electrodes
(2024)
In this work, the first simulation model of oxygen depolarized cathodes (ODC), which are silver catalyst-based gas diffusion electrodes, is presented that considers the phase equilibrium of the gas-liquid interface and ...
Light Field Imaging for Deflectometry
(2023)
Optical measurement methods are becoming increasingly important for high-precision production of components and quality assurance. The increasing demand can be met by modern imaging systems with advanced optics, such as ...
Roboter für Assistenzfunktionen
(2024)
The performance and flexibility of robot technologies make it possible to bring robots to everyday life. This creates many challenges: safety, legal regulations, reliability, reusability, and business models must be ...
Chip-scale optical frequency comb sources for terabit communications
(2022)
To keep up with the ever-increasing data transmission speed needs, data center interconnects are scaling up to provide multi-Tbit/s connectivity. These links require a high number of WDM channels, while the associated ...
Kleinskalige Charakterisierung der Fest-Flüssig-Trennung und Betrachtung des Scherbruchs von Proteinkristallen
(2022)
Proteins are macromolecules composed of amino acids that are essential for a large number of biological metabolic processes. Proteins are also used in technical applications, for example to catalyze reactions. The objective ...
Der grundrechtliche Schutz der digitalen Identität unter Berücksichtigung von Datenschutz- und IT-Sicherheitsrecht
(2022)
The digital identity is the essential human data interface when interacting on the Internet or with IT systems to enable the multitude of services. No platform can be used without creating a (at least temporary) data ...
Automatisierte, minimalinvasive Sicherheitsanalyse und Vorfallreaktion für industrielle Systeme
(2022)
Automated defense and prevention measures designed to protect industrial automation and control systems often compromise their real-time processing, resilience and redundancy. Therefore, they need to be performed as ...
Reconstruction from Spatio-Spectrally Coded Multispectral Light Fields
(2022)
In this work, spatio-spectrally coded multispectral light fields, as taken by a light field camera with a spectrally coded microlens array, are investigated. For the reconstruction of the coded light fields, two methods, ...
Dynamic Incentives for Optimal Control of Competitive Power Systems
(2022)
This work presents a real-time dynamic pricing framework for future electricity markets. Deduced by first-principles analysis of physical, economic, and communication constraints within the power system, the proposed ...
Topologie-Optimierung eines radselektiv angesteuerten Fahrzeugs basierend auf einer optimalen Fahrzeugführungsregelung
(2022)
The electrification and automation of passenger vehicles promote innovations of the entire vehicle architecture. If wheel-selective steered and driven vehicles are considered, challenges of urban regions can be met. In ...
Efficient fast Fourier transform-based solvers for computing the thermomechanical behavior of applied materials
(2022)
The mechanical behavior of many applied materials arises from their microstructure. Thus, to aid the design, development and industrialization of new materials, robust computational homogenization methods are indispensable. ...
Interaktionstechniken für mobile Augmented-Reality-Anwendungen basierend auf Blick- und Handbewegungen
(2022)
Intuitive interaction techniques are essential for mobile augmented reality systems. For implicit interaction, this work presents techniques for automatic eye movement analysis and visualization. In the context of explicit ...
Kursbuch Geschichte der europäischen und globalen Moderne
(2022)
“Kursbuch Geschichte der europäischen und globalen Moderne” offers a compendium and study book on types of events, central terms and learning strategies in modern and contemporary European and global history as an exemplary ...
Consistent View-Based Management of Variability in Space and Time
(2022)
Developing variable systems faces many challenges. Dependencies between interrelated artifacts within a product variant, such as code or diagrams, across product variants and across their revisions quickly lead to ...
Dynamical Modeling and Control of Multiphase Heat Transport Systems Based on Loop Heat Pipes
(2022)
Effective heat transport systems in aerospace are based on multiphase loop heat pipes (LHPs). For a precise thermal control of the electronics, electrical heaters are additionally used to control the operating temperature ...
Forum Bildverarbeitung 2022
(2022)
Fiber-dependent injection molding simulation of discontinuous reinforced polymers
(2022)
This work presents novel simulation techniques for injection molding of fiber reinforced polymers. These include approaches for anisotropic flow modeling, hydrodynamic forces from fluid on fibers, contact forces between ...
Advanced Elastocaloric Cooling Devices Based on Shape Memory Alloy Films
(2022)
Elastocaloric cooling is an emerging solid-state cooling technology with the potential to provide environmentally friendly, efficient cooling. The elastocaloric effect in superelastic shape memory alloy films is used to ...
Distributed Optimization with Application to Power Systems and Control
(2022)
Mathematical optimization techniques are among the most successful tools for controlling technical systems optimally with feasibility guarantees. Yet, they are often centralized—all data has to be collected in one central ...
Cross-Border Collaboration in Disaster Management
(2022)
In recent years, disaster events spreading across national borders have increased, which requires improved collaboration between countries. By means of an agent-based simulation and an empirical study, this thesis provides ...
Human-Machine Cooperative Decision Making
(2022)
The research reported in this thesis focuses on the decision making aspect of human-machine cooperation and reveals new insights from theoretical modeling to experimental evaluations: Two mathematical behavior models of ...
Neue Methode zur Bestimmung und Beschreibung der taktfrequenten Stromsteigungen in Drehstromsynchronmaschinen
(2022)
Knowledge of the cycle-frequency changes in the machine currents is of great advantage for many methods of controlling modern, highly utilized electrical machines. But how can these changes in machine currents be reliably ...
Entwicklung von Modellen zur speichergestützten Versorgung mit regenerativen Energien in Inselnetzen
(2022)
The proposed method for the configuration of renewably powered energy supply systems as isolated grids backed by energy storage technology and based on statistical models shows the economic viability of such a system. The ...
Multi-frequency and multi-GNSS PPP phase bias estimation and ambiguity resolution
(2022)
Multi-frequency and multi-GNSS measurements from modernized satellites are properly integrated for PPP with ambiguity resolution to achieve the state-of-the-art fast and accurate positioning, which provides an important ...
Fundamentals for the Dimensioning and Optimization of Prestressed Segmented Girders for Application in Bridge Crane Systems
(2022)
Bridge cranes are widely used as discontinuous material handling systems in industrial environments. The so-called crane bridge plays a central role in the overall construction. With increasing span widths and load capacities, ...
Multi-User Gesture Recognition with Radar Technology
(2022)
The aim of this work is the development of a Radar system for consumer applications. It is capable of tracking multiple people in a room and offers a touchless human-machine interface for purposes that range from entertainment ...
Entwicklung eines Messsystems zur modalbasierten Schädigungsanalyse von Brückenüberbauten
(2022)
Bridges are key components of infrastructure networks, which are the basic prerequisite for a prospering economy. Regarding maintenance scheduling, profound knowledge of the current bridge condition is of high interest. ...
Konvolutionäre neuronale Netze in der industriellen Bildverarbeitung und Robotik
(2022)
In the first part of this dissertation, a framework for the design of a CNN for FPGAs is presented, consisting of a preprocessing algorithm, an augmentation technique, a custom quantization scheme and a pruning step of the ...
Power, policies, and algorithms - technologies of surveillance in the European border surveillance regime
(2022)
This work analyses the emergent European border surveillance regime as part of the European border regime/migratory regime and the power structures this technologogical regime is embedded into, is reproducing and creating. ...
Einfluss atmosphärischer Umgebungsbedingungen auf den Lebenszyklus konvektiver Zellen in der Echtzeit-Vorhersage
(2022)
Precise warnings of the accompanying effects of thunderstorms are essential for preventive measures. The dynamic development of thunderstorm cells often leads to a large discrepancy between the real-time forecasts (nowcasts) ...
Kinematische Tätigkeitsanalyse
(2022)
The assessment of perceived exertion is highly relevant for workplace design to improve the quality of work. This approach represents an objective method based on kinematic data. The method's objective was to determine the ...
Integration von Nachhaltigkeitsaspekten in die operativen und strategischen Prozesse von Kapitalverwaltungsgesellschaften für Immobilienfonds
(2022)
In this work, a proposal for the integration of sustainability aspects into existing risk and portfolio management processes of capital management companies for real estate funds is developed and presented. Here, the ...
Hybride Beamformingsysteme niedriger Komplexität für den Mobilfunk
(2022)
An important method to increase the spectral efficiency of wireless radio communication networks is the use of multiple-input multiple-output communication systems operating in the centimetre and millimetre wave region. ...
Ein Beitrag zur asymptotischen Analyse der hydraulischen Ventilsteuerungen
(2022)
A method based on the singular perturbation theory and the averaging method is developed for the dynamic analysis of hydraulic valves. Periodic solutions are calculated and stability is analyzed under the influence of ...
Fahrerintentionserkennung zur lichtbasierten Kommunikation mit Fußgängern
(2022)
Especially pedestrians rely on the interaction with other road users. The introduction of automated driving systems withdraws this communication from drivers and thus, vehicles need to interact with pedestrians.
Therefore, ...
Multiskalige Modellierung von Lithium-Ionen-Batterien
(2022)
In this work, model approaches for the internal processes of large-format lithium-ion batteries are developed, experimentally parameterized, and validated. The electrochemical losses in the electrode’s microstructure are ...
Modeling transport properties and electrochemical performance of hierarchically structured lithium-ion battery cathodes using resistor networks and mathematical half-cell models
(2022)
Hierarchically structured active materials in electrodes of lithium-ion cells are promising candidates for increasing gravimetric energy density and improving rate capability of the system. To investigate the influence of ...
Light Emission from Single Self-decoupled Molecules in a Scanning Tunnelling Microscope
(2022)
In this work, a clear pathway is presented to achieve well-defined electronically decoupled chromophores from metallic leads without requiring additional insulating layers. To study such self-decoupled molecules, STM ...
Welt als ideales Artefakt
(2022)
The construction of artificial, ideal worlds as habitats and their history.
Adaptive Dynamic Programming: Solltrajektorienfolgeregelung und Konvergenzbedingungen
(2022)
In this work, discrete-time and continuous-time methods that integrate flexible reference trajectory representations into Adaptive Dynamic Programming approaches are presented and analyzed for the first time. Moreover, ...
Experimentelle und numerische Analyse des Körperschallübertragungsverhaltens von Aggregatelagerelementen im akustisch relevanten Frequenzbereich
(2022)
The structure-borne sound transmission properties of hydraulic and conventional engine mounts is analyzed experimentally and numerically in a acoustically relevant frequency range. In order to do so, first of all a test ...
Performance Analysis and Capacity Planning of Multi-stage Stochastic Order Fulfilment Systems with Levelled Order Release and Order Deadlines
(2022)
Order fulfilment systems are forced to manage a volatile customer demand while meeting customer-required short order deadlines. To handle these challenges, we introduce the Strategy of Levelled Order Release (LOR) for ...
Experimental characterization and modelling of textile reinforced masonry structures with the Equivalent frame method
(2022)
An innovative strengthening technique for the seismic retrofitting of masonry buildings is the fabric-reinforced cementitious matrix (FRCM). The system presented in this work is EQ-GRID, which consists of a multi-axial ...
Detektion und Klassifizierung unterschiedlicher Bedeckungen auf Abschlussscheiben von LiDAR-Sensoren
(2022)
By providing a high resolution at high distances in a broad field of view, LiDAR sensors are a key element in automated driving cars. However, in harsh environmental conditions, particles from rain or dust attach on the ...
Microstructure generation and micromechanical modeling of sheet molding compound composites
(2022)
We introduce an algorithm that allows for a fast generation of SMC composite microstructures. An exact closure approximation and a quasi-random orientation sampling ensure high fidelity. Furthermore, we present a modular ...
Lebensdauer von LED-Baugruppen
(2022)
This work deals with the material degradation of LED package materials and their contribution to degradation of the whole LED device. The occurring failure modes within the LED package are described and predicted by the ...
Simulation of the thermoforming process of UD fiber-reinforced thermoplastic tape laminates
(2021)
In this work, initially, the requirements on a simulation model of the non-isothermal stamp forming process of unidirectional fiber-reinforced, and thermoplastic tape laminates are investigated experimentally. On this ...
Utility, Progress, and Technology: Proceedings of the 15th Conference of the International Society for Utilitarian Studies
(2021)
This volume collects selected papers delivered at the 15th Conference of the International Society for Utilitarian Studies, which was held at Karlsruhe Institute of Technology in July 2018. It includes papers dealing with ...
State-of-the-Art of High-Power Gyro-Devices. Update of Experimental Results 2021
(2021)
This report presents an update of the experimental achievements published in the review “State- of-the-Art of High-Power Gyro-Devices and Free Electron Masers”, Journal of Infrared, Millime-ter, and Terahertz Waves, 41, ...
Dynamics of Rotors on Refrigerant-Lubricated Gas Foil Bearings
(2021)
The gas foil bearing (GFB) technology is a key factor for the transition to oil-free rotating machinery. Among numerous advantages, GFBs offer the unique ability to be lubricated with working fluids such as refrigerants. ...
Diagenetic controls on fluid flow and mechanical properties in Rotliegend reservoir sandstones
(2021)
Reservoir quality of Rotliegend sandstones is mainly controlled by their permeability, and porosity, and their mechanical properties. Thus, diagenetic porosity-reducing processes need to be understood to evaluate reservoir ...
Belief State Planning for Autonomous Driving
(2021)
This work presents a behavior planning algorithm for automated driving in urban environments with an uncertain and dynamic nature. The algorithm allows to consider the prediction uncertainty (e.g. different intentions), ...
Phase-field Modeling of Phase Changes and Mechanical Stresses in Electrode Particles of Secondary Batteries
(2021)
Most storage materials exhibit phase changes, which cause stresses and, thus, lead to damage of the electrode particles. In this work, a phase-field model for the cathode material NaxFePO4 of Na-ion batteries is studied ...
Convective precipitation simulated with ICON over heterogeneous surfaces in dependence on model and land-surface resolution
(2021)
The impact of land-surface properties like vegetation, soil type, soil moisture, and the orography on the atmosphere is manifold. These features determine the evolution of the atmospheric boundary layer, convective conditions, ...
