Doktorarbeiten

Predicting how quickly a fire can grow over surrounding combustible materials is a critical aspect in assessing fire scenarios. A promising approach to this challenge lies in numerical flame spread simulations that are able to predict the heat release rate (HRR) and rate of spread (ROS), based on pyrolysis modelling. [...]

Single-crystal turbine blades made of nickel-based superalloys, such as CMSX-4, are of great importance for gas turbines due to their excellent high-temperature properties, however, they are subject to various damage mechanisms. Repairing these costly components is desirable for both ecological and economic reasons; however, it poses a challenge as the single-crystal microstructure in the repair area must be restored. [...]

Since renewable energy sources supply electricity with temporal fluctuations, efficient energy storage methods play a key role in bridging the gap between generation and consumption. Proton exchange membrane water electrolysis (PEM electrolysis) represents a central technical solution in this context. [...]

This thesis paves the way for the assembly of supramolecular structures by autonomous robotic nanofabrication based on RL and their characterisation using the tools of nanoscience. In a proof of principle application the RL agent removed single molecules from a layer in which they were held together by strong molecule-surface and intermolecular interactions. [...]

Climate change mitigation requires the rapid defossilisation of the German electricity sector. While energy system models are extensively used to evaluate climate change mitigation strategies, they generally consider environmental aspects in a limited manner, often focusing on direct operational emissions. [...]

The protection of metallic combustion chamber walls and high-temperature blades in aircraft turbines by ceramic thermal barrier coatings (TBC) and air film cooling is crucial for increasing the efficiency and service life of the turbine. A further improvement in efficiency requires an increase in the gas inlet temperature, which necessitates the development of optimized WDS systems and cooling concepts. [...]

Physics-based battery models with the Doyle-Fuller-Newman (DFN) model has been regarding as the very powerful model to simulate the Li-ion batteries behaviour with good accuracy. However, the high computational demand and parameterization are the two main challenges have been the main obstacle for the model have limited it use in applications [...]