Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Tilgner, Andreas Prof. Dr."
Now showing items 21-40 of 49
-
Large scale resistivity surveys combining magnetic and magnetotelluric observations
(2006-09-18)Electromagnetic methods allow investigations of subsurface conductivity structures. This work focuses on electromagnetic array data (38 measuring sites) covering an area of 900x600 square ... -
Magnetohydrodynamic Simulation of Reconnection in Turbulent Astrophysical Plasmas
(2016-08-31)Turbulence is ubiquitous at large-Reynolds-number astrophysical plasmas like in the Solar corona. In such environments, the turbulence is thought to enhance the energy conversion rate by magnetic reconnection above ... -
Mean-field view on geodynamo models
(2005-11-01)Mean-field theory provides a useful description of magnetohydrodynamic processes leading to large-scale magnetic fields in various cosmic objects. In mean-field theory, the coefficients ... -
MHD-Computersimulationen zur Begleitung des Projektes DRESDyn
(2019-03-15)Numeric simulations of rotating flows are often limited by effects in the boundary layer, which need a very high grid resolution. This work investigates the ability of precession driven flows to amplify magnetic fields due ... -
Microfluidic cells as a model 2D granular material
(2017-03-20)I have made quasi-2D granular analogs using microfabrication techniques common in microfluidics such as photo- and Soft Lithography. I have performed two kinds of experiments common in multiphase flow problems: drying and ... -
Modellbildung für die Schallverstärkung in nachgiebig ausgekleideten Strömungskanälen
(2004-01-05)Short acoustically lined sections of flow ducts can amplify sound that travels downstream at frequencies slightly above the resonance frequency of the lining.I discuss models of this effect ... -
Modelling the corona of stars more active than the Sun using 3D MHD simulations
(2021-06-10)Cool stars like our Sun are surrounded by coronae with temperatures up to several million Kelvin. After decades of research, there has been no definite explanation as to why the coronae of stars are several orders of ... -
Moist Rayleigh Benard Convection
(2018-10-19)Clouds play an important yet poorly understood role in weather forecasting and climate change. The objective in the present work is to establish a laboratory-scale experiment for simulating clouds in the Earth's atmosphere. ... -
Multi-dimensional Polarized Radiative Transfer Modeling of Titan's Atmosphere
(2003-07-25)The primary purpose of this thesis work is to develop a multi-dimensional radiative transfer model, which includes polarization, for Titan"s atmosphere and to validate this model. The model ... -
Multi-instrument study of the hourly pulsations in Saturn’s magnetosphere
(2017-10-20)The in-situ exploration of the magnetospheres of Jupiter and Saturn has revealed various pulsed phenomena, some of them being periodic. In Saturn's magnetosphere, several studies have reported pulsations with a periodicity ... -
Numerical Modelling of Zonal Winds on Gas Giants
(2023-12-22)The outer regions of both Jupiter and Saturn host strong, alternately eastward and westward zonal winds. These are essentially steady in time and cover all latitudes, albeit diminished in amplitude at the mid-to-high ... -
Numerical Simulations of the Gravitational Geodynamo and its Time Spectrum
(2011-06-30)This work contributes to the understanding of the dynamo mechanism. Gravitationally driven and convection driven dynamo simulations are studied. We analyzed dynamo mostly from the spectral ... -
Numerische Untersuchung rotierender Rayleigh-Bénard-Konvektion ohne Ekman-Schichten
(2010-02-05)This work deals with numerical studies of rotating Rayleigh-Bénard convection in a planar fluid layer. A spectral method is employed with periodic boundary conditions in the horizontal ... -
Observations of large-scale solar flows
(2021-04-13)In this dissertation, several components of large-scale solar flows are studied observationally: solar equatorial Rossby waves (waves of radial vorticity), large-scale convection, and surface flows around active regions. ... -
Pattern Formation in Spatially Forced Thermal Convection
(2010-02-04)In this work experimental results on forced thermal convection are presented. Experiments were done in a large aspect ratio cell slightly above the critical temperature difference at which ... -
Physical modeling of motile and sedimenting plankton: from simple flows to turbulence
(2022-11-22)Planktonic microorganisms play a fundamental role in oceanic ecology and chemical cycles. Different planktonic species are found at various levels of the oceanic trophic chain, ranging from photosynthetic organisms to ... -
Plate tectonics in computational simulations of terrestrial mantle convection with grain-size-dependent rheology
(2002-01-22)This thesis investigates a new model to improve plate-like behavior of the lithosphere in two-dimensional mantle convection simulations. Satisfactory plate-like behavior includes localized ... -
Probing Light-Matter Interactions in Plasmonic Nanotips
(2020-09-03)The exploration of light-matter interaction has inspired some of the most essential theories and applications in fundamental science and technology. Cutting-edge research, such as ultrafast time-resolved and super-resolution ... -
Proton Beam Writing
(2022-12-16)Proton beam writing (PBW) is a mask-less 3D structuring method that uses a focused, relatively high energy Proton beam, followed by an etching step to create free standing 2D and 3D structures in a large variety of target ... -
Rotation and non-Oberbeck-Boussinesq effects in turbulent Rayleigh-Bénard convection
(2015-07-15)In this thesis different aspects of turbulent Rayleigh-Bénard convection have been studied that go beyond of what the majority of recent investigations focuses on. The two main concerns here, were the influence of rotation ...