Doctoral Thesis
Recent Submissions
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Conduction and Interface Phenomena in Gas-Insulated DC Systems
(2018)A detailed understanding of the charge generation and transport in gaseous insulation forms the basis for modeling numerous problems in high-voltage engineering. Some examples for processes relevant to the dimensioning of gas-insulated devices are the surface-charging phenomena at insulator surfaces, prediction of initiatory electron provisions for partial discharges in small voids, estimation of statistical time lags for breakdown inception ...Doctoral Thesis -
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Experimental and Numerical Investigations of Salt Separation from Biomass at Hydrothermal Conditions Exploiting Aqueous Solutions of Sodium Sulfate and Pure Water as Model Systems
(2018)Using concentrated solar energy to power a hydrothermal biomass gasi- fication process (HTG process) requires a thermal energy storage (TES) to compensate for the inherent intermittence of solar irradiation. The energy transfer from the TES to the HTG process is accomplished via a heat-transfer fluid (HTF) passing through a heat exchanger (HX) incor- porated into the salt separator of the HTG process. The HX performance determines the ...Doctoral Thesis -
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Measurements of Ice Nucleating Particles at the High Altitude Research Station Jungfraujoch
(2018)Doctoral Thesis -
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Green and Simple Approaches Towards the Modification of Lignocellulosic Surfaces
(2018)Aesthetic appearance, the good mechanical properties with regard to its light-weight and especially its natural abundance made wood an important material for the last centuries. However, wood is at the current situation often not the engineering material of choice as it suffers from its inherent drawbacks due to its hygroscopic character, e.g. the dimensional stability, and degradation processes including biological and UV degradation. ...Doctoral Thesis -
Synchronized Two-Beam Strategies for Selective Laser Melting
(2018)Additive Manufacturing, and selective laser melting in particular, are currently in the focus of various industrial sectors. The processes offer a far higher freedom of design than conventional manufacturing technologies which are already used in industry for decades or even centuries. The additive manufacturing technologies don't even need part specific tools to offer these benefits. Yet, porosity, anisotropy, evaporation and spattering, ...Doctoral Thesis -
Two-Phase Flow in Liquid Chromatography - Experimental and Theoretical Investigation
(2018)Liquid chromatography is a technology applied for challenging separation tasks, for example for separating or purifying sensitive or chemically similar products. When applying liquid chromatography for analytics, dilute solutions of the analytes are injected in short pulses. In turn, in preparative applications, higher concentrations of the components are injected for a longer feed duration. In this context, it is possible that, upon an ...Doctoral Thesis -
Quantifying Effects of Land-Climate Interactions on Spatiotemporal Variations of Near-Surface Air Temperature
(2018)Energy and water fluxes between the land and the atmosphere strongly depend on the state of the land surface. A key process in this respect is the control of soil moisture on the partitioning of net radiation into latent and sensible heat fluxes. Especially near-surface air temperatures can be considerably affected by modified shares of these fluxes. Different metrics have been developed to assess the soil moisture effects on latent heat ...Doctoral Thesis -
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Epidemic processes
(2018)Various phenomena in our daily world exhibit similarities to epidemic spreading. Fashion or technical trends are referred to as viral when they reach a large part of a society. In general, trends, opinions, diseases and failure in social or technical networks are characterized by the fact that they spread from an ``infected'' source to a ``non-infected'' state. We use the term epidemic process to refer to the described variety of different ...Doctoral Thesis -
Topological Structures in Magnetic and Electric Materials
(2018)Perturbations in magnetically or electrically ordered materials can form stable defectsthat cannot be erased by local fluctuations. An example is a domain wall between twoareas with differently oriented magnetisation. To remove that domain wall, one wouldhave to switch an extensive region of spins. This would require a large amount of energyand therefore grants the domain wall a certain stability. A tool to generally characterisethe ...Doctoral Thesis -
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