Publications
Now showing items 201-300 of 466
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, ...
Numerical prediction of curing and process-induced distortion of composite structures
(2021)
Fiber-reinforced materials offer a huge potential for lightweight design of load-bearing structures. However, high-volume production of such parts is still a challenge in terms of cost efficiency and competitiveness. ...
Realities, Challenges, Visions?
(2022)
Changing realities, global power shifts, and societal upheavals are resulting in new tasks and challenges for Foreign Cultural and Educational Policy. In an age of globalisation, digitisation, and growing nationalism, there ...
Experimental investigation and process simulation of the compression molding process of Sheet Molding Compound (SMC) with local reinforcements
(2022)
In this book, a new three-dimensional approach for the process simulation of SMC is developed. This approach takes into account both, the core layer that is dominated by the extensional viscosity and the thin lubrication ...
Waveguide-Based Photonic Sensors: From Devices to Robust Systems
(2022)
Integrated photonic sensor systems are miniaturized, mass-producible devices that leverage the mature semiconductor fabrication technology and a well-established ecosystem for photonic circuits. This book aims at a holistic ...
Building Transformation Networks for Consistent Evolution of Interrelated Models
(2022)
Complex software systems are described with multiple artifacts, such as code, design diagrams and others. Ensuring their consistency is crucial and can be automated with transformations for pairs of artifacts. We investigate ...
Impacts of natural disasters on supply chain performance
(2021)
Considering the increasing importance of natural disaster events it is inevitable to also focus on their impacts on supply chains as well as their performance impacts on them. The developed approach SCperformND (Supply ...
Bildende Künstler im Fotoporträt
(2022)
To define the social interactions of a photographer and the portrayed artist as friendship is a recurring topos in art. However, only in some instances can the photographic portrait fulfill the concrete visibility represented ...
Ein Beitrag zur Auslegung tragender Klebverbindungen im Fassadenbau
(2022)
This work describes investigations into the design of load-bearing bonded joints facade construction. The core element is the analysis of the time- and temperature-dependent load-bearing behavior of bonded joints. For this ...
Untersuchungen zum Arbeitsfluss in getakteten Bauproduktionssystemen aus Perspektive von Generalunternehmern
(2022)
A good workflow plays a crucial role in production in terms of productivity and efficiency. In construction, the use of tact creates flow.The scientific work takes on the flow and tact in construction. A workflow evaluation ...
Werkzeuge und Konzepte für die Untersuchung und Entwicklung zukünftiger Kfz-Bremssysteme
(2022)
The electrification of the power train as well as the automatisation of driving have a strong influence on chassis for future vehicles. Due to the possibility for recuperation using the electric motor a strong shift in the ...
Compaction and cementation controls on reservoir quality in Buntsandstein red beds
(2022)
Reservoir quality in fluvial siliciclastic rocks is variable. Permeability is influenced by micron-scale grain coatings or bedding style on the m-/km-scale. Outcrops allow the analysis of depositional environments and ...
Wirksamkeit der Taktplanung aus Perspektive des Bauherrn am Beispiel von Produktionsimmobilien in der Automobilindustrie
(2022)
This work analyses the time effect that occurs due to the use of takt planning and takt control during the construction process from the perspective of the client. At first the historical courses of takt planning and takt ...
Möglichkeiten und klimarelevante Auswirkungen der stofflichen Nutzung von Kohlenstoffdioxid
(2022)
Energy transition and climate protection cause extensive changes in the German energy supply. In this context, there is an additional interest in the material utilization of carbon dioxide. The possible contributions to ...
AC Losses in High-Temperature Superconductor Tapes and Cables for Power Applications
(2022)
This work focuses on two topics. The first is the investigation of producing filaments on copper-stabilized coated conductors, with striations made after or before electroplating the tape. The second topic is the applicability ...
Ganzheitliche Optimierung einer Axialkolbenpumpe durch bedarfsangepasste Entlastung tribologischer Kontakte
(2022)
Swash plate axial piston pumps are used in various industrial & mobile applications. An optimization of this displacement principle can be achieved by the active influence of the hydrostatic relief in tribological contacts.The ...
Facility Location Planning in Relief Logistics: Decision Support for German Authorities
(2022)
The delivery of essential goods to beneficiaries in the aftermath of a disaster is one of the main objectives of relief logistics. Thereby, the present work aims to improve relief logistics by improving the location selection ...
Eine agentenbasierte Architektur für Programmierung mit gesprochener Sprache
(2022)
The system described in this work, called ProNat, makes end-user programming with spoken language possible. It enables non-experts to describe programs for different target systems and to extend their functionality using ...
Untersuchung der Augensicherheit durch Multi-Pulsbestrahlung für LiDAR-Anwendungen
(2022)
LiDAR (Light detection and ranging) represents one of the key technologies for autonomous driving. For this reason, this work is concerned with the question of eye safety of the laser-based technology. For this purpose, ...
Fluorescent thermal imaging method for investigating transient effects in high-temperature superconductor tapes and coils
(2022)
This work presents the development and application of high-speed fluorescent thermal imaging for quench analysis in high-temperature superconductors (HTS). Using a fluorescent coating, with a temperature-dependent light ...
Guaranteed Verification of Dynamic Systems
(2022)
This work introduces a new specification and verification approach for dynamic systems. The introduced approach is able to provide type II error free results by definition, i.e. there are no hidden faults in the verification ...
Deep Learning based Vehicle Detection in Aerial Imagery
(2022)
This book proposes a novel deep learning based detection method, focusing on vehicle detection in aerial imagery recorded in top view. The base detection framework is extended by two novel components to improve the detection ...
Emanzipatorisches Wohnen
(2022)
Thermodynamically consistent space-time discretization of non-isothermal mechanical systems in the framework of GENERIC
(2022)
The present work addresses the design of structure-preserving numerical methods that emanate from the general equation for non-equilibrium reversible-irreversible coupling (GENERIC) formalism. Novel energy-momentum (EM) ...
NMR micro-detectors tailored for multinuclear and electrochemistry lab-on-a-chip applications
(2022)
This work offers three solutions tailored to specific applications to overcome NMR challenges in the micro-domain. As the first sub-topic of this work, different potential electrode designs, compatible with NMR technique, ...
Active Vision for Scene Understanding
(2021)
Visual perception is one of the most important sources of information for both humans and robots. A particular challenge is the acquisition and interpretation of complex unstructured scenes. This work contributes to active ...
Manchester Ship Canal
(2021)
This book investigates how urban/rural patterns provide differing conditions for living and working. The project is to read and analyse these urban/rural settlement structures and provide insight into the patterns of living ...
Effizienzoptimierung mobilhydraulischer Load-Sensing-Systeme durch Reduzierung systembedingter Druckverluste am Beispiel eines Hydraulikbaggers
(2024)
In this thesis, a hydraulic circuit will be developed, which can reduce the partial load losses of hydraulic-mechanic load-sensing systems (LS). As reference application, the LS system of an hydraulic excavator will be ...
Textkompetenz in den MINT-Fächern
(2024)
This edited volume is dedicated to the topic of text literacy in STEM subjects. Text literacy is understood as the ability to receive, produce and learn from texts. The topic of text literacy is dealt with in three sections, ...
Probabilistic Prediction of Energy Demand and Driving Range for Electric Vehicles with Federated Learning
(2024)
In this work, an extension of the federated averaging algorithm, FedAvg-Gaussian, is applied to train probabilistic neural networks. The performance advantage of probabilistic prediction models is demonstrated and it is ...
Refraktive Multifokusröntgenlinsen und Hartmann-Shack-Sensoren
(2024)
Compound refractive X-ray lenses (CRLs) have an absorption-limited numerical aperture. In this work, an array of CRLs with slightly inclined optical axes is used to circumvent this limitation in full-field microscopy at ...
Experimentelle Untersuchung der Zündung von Kerosin Jet A-1 unter subatmosphärischen Bedingungen
(2024)
The present study investigates the generation of a flame kernel in the polydisperse spray of a complex fuel under the influence of turbulent flow and under subatmospheric conditions in order to contribute to a better ...
Image registration between MRI and spot mammograms for X-ray guided stereotactic breast biopsy
(2024)
This work proposes a novel method for a matching tool between MRI and spot mammograms. Two registration methods are used : a biomechanical model based registration between MRI and full X-ray mammograms, followed by an image ...
Querdynamik von Velomobilen unter Berücksichtigung der Reifeneigenschaften
(2024)
Alternative vehicle concepts such as velomobiles can contribute to reducing CO2 emissions in the mobility sector. These lightweight, aerodynamic recumbents are capable of high speeds, which expands their field of application ...
Principles of Catastrophic Forgetting for Continual Semantic Segmentation in Automated Driving
(2024)
Deep learning excels at extracting complex patterns but faces catastrophic forgetting when fine-tuned on new data. This book investigates how class- and domain-incremental learning affect neural networks for automated ...
Constrained-layer damping in hybrid fibre metal elastomer laminates and its tolerance to damage
(2025)
This work presents experimental, analytical and numerical methods for predicting structural behaviour as well as damping capabilities of hybrid fibre metal elastomer laminates (FMELs), particularly for the assessment and ...
Fragilitätsuntersuchungen und Schadensklassifikationen im Erdbebenfall auf Basis von luftgestützten Aufnahmen
(2025)
Following seismic events, there is often a lack of damage data, which impedes the rescue of lives and the effective deployment of resources. The objective of this thesis is to make an interdisciplinary contribution to the ...
OCM 2025 - 7th International Conference on Optical Characterization of Materials
(2025)
The state of the art in the optical characterization of materials is advancing rapidly. New insights have been gained into the theoretical foundations of this research and exciting developments have been made in practice, ...
Laserbasierte Verschaltung und Strukturierung von Perowskit-Solarmodulen
(2025)
This work explores laser-based interconnection and structuring of perovskite solar modules for industrial production and scaling. The goal is to develop efficient processes for high-performance modules, including transparent ...
Architecture-Based and Uncertainty-Aware Confidentiality Analysis
(2025)
In this work, we investigate architecture-based confidentiality analysis under uncertainty. We present a classification of uncertainty regarding confidentiality, a catalog of uncertainty sources, an uncertainty impact ...