Books

Der Individualverkehr mit PKW ist ein wichtiger Bestandteil der deutschen Wirtschaft. Als Treibstoffe werden Kohlenwasserstoffe auf Erdölbasis verwendet, die bei der Verbrennung in Motoren neben anderen Abgasen Kohlenstoffdioxid erzeugen. [...]

Land–atmosphere coupling, which represents the exchanges of water, energy and momentum between the land surface and atmosphere, plays a central role in shaping regional hydroclimate variability and climate extremes. These influences are transmitted through a chain of linked processes connecting soil moisture, evapotranspiration, boundary-layer development, cloud formation, and precipitation. [...]

In dieser Arbeit wird ein gemischt-ganzzahliges Optimierungsproblem zur Nominierungsvalidierung (NoVa) präsentiert und eingesetzt, um eine szenariobasierte Betrachtung möglicher Betriebszustände in Wasserstoff- und Erdgasinfrastrukturen durchzuführen. Zum einen wird das Modell eingesetzt, um mögliche Betriebszustände und Engpässe im von den Fernleitungsnetzbetreibern Gas im Rahmen des Netzentwicklungsplan Gas 2020 (NEP-Gas 2020) antizipierten initialen Wasserstoffnetz bis 2025 und bis 2030 zu analysieren. [...]

Among the industrialized processes of water electrolysis, proton exchange membrane water electrolysis (PEMWE) has been demonstrated to exhibit high efficiency, thus contributing to the production of green hydrogen and playing a crucial role in decarbonizing the production of fundamental chemicals such as ammonia and methanol. Additionally, PEMWE can contribute to the electrification of our energy system, a pivotal step in the transition to a low-carbon economy. [...]

Anion exchange membrane water electrolysis (AEMWE) is a promising technology for sustainable hydrogen production, combining the prospect of high current-density operation with the potential for reduced reliance on scarce materials. This thesis investigates the integration of nickel–iron layered double hydroxide (Ni3Fe-LDH) as an oxygen evolution reaction (OER) catalyst into AEMWE systems, with the goal of developing and validating membrane electrode assemblies (MEAs) suitable for scalable fabrication and future stack integration. [...]

During operation of high-power nuclear fusion reactors plasma-facing components (PFCs) are exposed to challenging conditions. Due to its properties, pure tungsten is currently the preferred candidate for the plasma-facing material (PFM). [...]

The interplay between exchange interaction and spin-orbit coupling (SOC) in lowdimensional ferromagnetic systems plays a pivotal role in shaping their electronic and spin properties, with direct implications for spintronic applications. This thesisinvestigates the electronic structure of ultrathin epitaxial FePd alloy on Pd(001) using spin- and momentum-resolving photoemission spectroscopy, focusing on symmetry breaking and SOC-driven band hybridization. [...]

Air pollution poses a significant threat to human health and the environment. Although efforts are being made to develop emission inventories, and characterise and quantify emission rates, the absence of direct measurements introduces uncertainty into model-based estimations, leading to uncertain air pollution predictions. [...]

Spectral Deferred Correction (SDC) is a method for numerically integrating initial value problems. The method iteratively generates solutions to fully implicit Runge-Kutta methods with forward substitution using low order solves. [...]