Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Tilgner, Andreas Prof. Dr."
Now showing items 1-20 of 48
-
Analysis of Space Weather Impacts on the Terrestrial Ionosphere and Development and Testing of a Coronagraph for Space Weather Forecasts
(2020-07-22)The ionosphere is a conductive layer of the Earth's atmosphere, characterised by the presence of free electrons. Through interaction with electromagnetic waves, it influences a wide spectrum of radio wave communications, ... -
Boundary layers and wind in turbulent thermal convection
(2014-07-24)This cumulative thesis is based on seven publications and is devoted to the investigation of turbulent thermal convection by means of Direct Numerical Simulations (DNSs). Special focus is placed on the boundary layers and ... -
Computer Simulations for Hydrogen Loaded Palladium Clusters
(2007-08-07)In this work, a new expression for the chemical potential μ of H in Pd is used, which relies on an extension of Widom's particle insertion method. Being an exact expression, this μ contains ... -
Crack patterns on uneven substrates
(2016-04-29)Cracks patterns are in uenced by the substrates beneath them. From buried craters to crocodile skin, crack patterns are found over an enormous range of length scales. Regardless of their scale, substrates can impart ... -
Dreidimensionale thermische Evolutionsmodelle für das Innere von Mars und Merkur
(2006-07-25)The interior structure and evolution of the terrestrial planets are closely related to convective activity in their interior. These endogenic processes are responsible for many geological ... -
Eddy-Kovarianz Messungen über einem tropischen Regenwald in komplexem Gelände
(2007-07-17)Carbon budgets of terrestrial ecosystems are of great importance for understanding the global carbon cycle. The region of Southeast Asia is one of the least investigated areas as ... -
Effective Description of Superstructures in Turbulent Convection
(2021-03-04)This thesis is dedicated to the study of turbulent superstructures in Rayleigh-Bénard convection. Turbulent superstructures are horizontally extended large-scale flow patterns that emerge despite the presence of strong ... -
Elektrische Anisotropie durch ausgerichtete Olivinkristalle im oberen Mantel in Mitteleuropa: Magnetotellurische Array-Messungen und ein Ansatz zum Vergleich mit seismischer Anisotropie
(2002-06-19)Upper mantle electrical conductivities provide, besides seismic velocities or thermal diffusivities, another source of information on the upper mantle structure and composition.Interpretation ... -
Elliptical instability of compressible flow and dissipation in rocky planets for strong tidal forcing
(2016-02-02)This thesis is divided into three main parts, in accordance with Chapters 2, 3 and 4. In the first part, Chap. 2, we investigate the elliptical instability. We calculate the growth rates of the elliptical instability under ... -
Evolution of Droplet Distributions in Hydrodynamic Systems
(2012-01-04)For droplets in a supersaturated environment, a complex interplay of nucleation, diffusional growth, collisions and coalescences, sedimentation and dripping determines the evolution of their ... -
Experimental Acquisition and Characterisation of Large-Scale Flow Structures in Turbulent Mixed Convection
(2014-07-28)In this cumulative thesis, the superposition of shear flow and thermal convection, namely mixed convection, is investigated experimentally. The experiments were performed in a cuboidal sample with aspect ratios Gamma_xz = ... -
Experimental investigation of a sheared thermally unstable boundary layer
(2021-07-02)In many natural and industrial systems, heat is transported by mixed convection, where an externally driven flow causes advection of the temperature field in addition to the fluid motion due to buoyancy of differentially ... -
Experimentelle Erfassung und Charakterisierung der dreidimensionalen großskaligen Strömungsstrukturen und -temperaturen in Rayleigh-Bénard-Konvektion
(2017-10-26)In this work the flow structures in Rayleigh-Benard-Convection (RBC) are experimentally studied. For this purpose, two cuboidal convection samples are designed and installed. Using water as working fluid, these two experiments ... -
Experimentelle Untersuchung von thermohalinen Treppen in doppelt-diffusiver Konvektion
(2023-01-12)This study deals with the modeling of a laboratory experiment where steady states as well as transients of double diffusive staircases can be observed by Particle Image Velocimetry (PIV) in a fluid layer. A stabilizing ... -
Experimentelle Untersuchungen von Fingerströmung und thermohalinen Treppen für instabile Auftriebsverhältnisse
(2016-04-19)Finger convection is observed experimentally in an electrodeposition cell in which a destabilizing gradient of copper ions is maintained against a stabilizing temperature gradient. This double-diffusive system shows finger ... -
Fluid instabilities in precessing ellipsoidal shells
(2002-02-06)The Earth precesses with a period of 25700 years due to the gravity fields of the Moon and the Sun acting on the Earth's equatorial bulge. The influence of the Earth's precessional motion ... -
Global magneto-convection models of stars with varying rotation rate
(2020-06-12)The solar magnetic field is mostly axisymmetric at the largest scale. Latitudinal dynamo waves propagate from mid-latitudes towards the equator, as can be seen, for example, from sunspot observations. Reproducing this ... -
Hybrid Systems Modeling Manufacturing and Front Dynamics
(2004-06-04)This thesis investigates the dynamics of a certain class of hybrid dynamical systems, so called switched tank systems. By applying switched tank systems as models for manufacturing systems ... -
Inertial modes, turbulence and magnetic effects in a differentially rotating spherical shell
(2017-11-09)The study of a fluid trapped inside a spherical shell is of fundamental interest in fluid mechanics, having given rise to numerous theoretical and experimental studies. This is also a geometric feature shared by geo- ... -
Kinematic dynamo onset and magnetic field saturation in rotating spherical Couette and periodic box simulations
(2013-07-26)Magnetic fields are ubiquitous in the universe and can be found in celestial bodies, galaxies, stars including our Sun and planets like the Earth or Jupiter. Due to the fact that at least in the Earth's interior, temperatures ...