Browsing Fakultät für Physik (inkl. GAUSS) by Advisor & Referee "Kollatschny, Wolfram Prof. Dr."
Now showing items 1-20 of 22
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Structure and Kinematics of the Broad-Line Region in Selected Changing-Look AGN
(2024-10-18)In this thesis, the results of three variability studies conducted on three individual active galactic nuclei (AGN) are presented. Each of these AGN belongs to the class of changing-look (CL) AGN, which are characterized ... -
Strong magnetic fields and unusual flows in sunspots
(2023-02-06)This thesis presents a study of sunspots, which are the most prominent features observed on the solar surface. Their structure is governed by the magnetic field. The umbra and penumbra of sunspots harbor different strengths ... -
Kationordnung und Grenzflächeneffekte in stark korrelierten Elektronensystemen
(2021-10-05)The work is about cation ordering and interface mechanism in strongly correlated electron systems -
The solar wind’s geomagnetic impact and its Sun--Earth evolution -- Predictive models for space weather and the Parker Solar Probe orbit
(2018-11-06)This thesis addresses two current topics in solar wind research and space weather. The first study is dedicated to the solar wind's impact on geomagnetic activity and the second study to the estimation of the solar wind ... -
Slender Ca II H fibrils observed by SUNRISE/SuFI
(2018-04-24)This thesis is devoted to analyzing the morphological and oscillatory properties of slender \caiih{} fibrils (SCFs) in the lower solar chromosphere. The aim of this study is to deepen our understanding of the physical ... -
Normal and counter Evershed flows in the penumbra of sunspots: HINODE observations and MHD simulations
(2018-04-23)Sunspot penumbrae harbor a distinctive gas outflow in the photosphere, known as the Evershed flow, whose origin has been an open question since its discovery in 1909. More recently, the existence of counter Evershed flows ... -
Analysis of historical solar observations and long-term changes in solar irradiance
(2017-10-25)The Sun is the main external driver of Earth's climate. Various mechanisms of the solar influence on climate have been proposed. The debate is ongoing, but variation in the radiative flux of the Sun is among the main ... -
Untersuchungen zum Lumineszenzverhalten des Aluminiumnitrids und der Aufbau einer Kurzzeit-Lumineszenz-Spektroskopie-Apparatur
(2017-07-07)This thesis consists of three different parts. In the first part it gives the reader an overview of the published results describing near band-edge as well as defect related luminescence in aluminium nitride, also presenting ... -
On the stability of massive stars
(2017-01-16)On the basis of the equations for stellar structure together with an equation of state, stellar models may be constructed. Using these stellar models, the effects of different parameters on the evolution and internal ... -
Hydrogen absorption property of nanocrystalline-magnesium films
(2016-11-07)The purpose of this study is to investigate hydrogen absorption properties of grain boundary rich pure magnesium film. X-ray diffraction (XRD) measurements has been carried out to estimate microstructures, texture, lattice ... -
Untersuchung der elektrischen Hyperfeinwechselwirkung in M<sub>n+1</sub>AX<sub>n</sub>-Phasen mittels der gestörten γ-γ-Winkelkorrelation
(2014-05-19)Mn+1AXn phases are thermodynamically stable nanolaminated ternary carbides and nitrides showing both metallic and ceramic properties. The letter M stands for an early transition metal, the letter A represents an A-element ... -
A Top Quark Mass Measurement Using the R32 Stabilized Variable with the ATLAS Detector
(2012-08-31)This thesis presents one of the first measurements of the top quark mass at the ATLAS experiment, one of the four large experiments located along the LHC. First discovered in 1995 at the Tevatron experiments CDF and D0, ... -
Die großräumige Umgebung von QSO/Seyfertgalaxien bei nahen und kosmologischen Rotverschiebungen
(2011-12-06)The goal of this thesis is to study the properties of galaxies in the environment of a quasar as a function of the characteristics of this central quasar. In addition, the galaxies in the ... -
Signatur von Stossfronten in verschmelzenden und aktiven Galaxien. Optische/UV- und Roentgenbeobachtungen
(2010-08-16)Merging galaxy system Markarian 266 (also NGC 5256) is a double nucleus system. This system lies at a distance of 115 Mpc. The two nuclei are thought to comprise a low-ionization nuclear ... -
X-ray Diagnostics of Accretion Plasmas in Selected Soft Polars
(2009-09-10)Accretion processes occur during diverse stages of stellar evolution and on diverse scales, as for example in star formation, in active galactic nuclei, or in close binaries with a compact ... -
Molekulardynamische Untersuchungen zur Binnendynamik kollabierender Blasen
(2009-06-23)This work deals with the numerical simulation of cavitation- and sonoluminescence-bubbles, as well as laser-induced bubbles. The interior of the bubble is simulated by molecular ... -
The star formation activity from the centers to the outskirts in intermediate redshift clusters
(2008-06-12)In the local universe, the relative fractions of galaxy types differs in galaxy clusters in comparison to the field. Observations at higher redshift provide evidence that cluster galaxies ... -
Exploring the formation histories of galaxies - globular clusters and beyond
(2008-06-09)One of the most struggling questions in todays astronomy is the question for the formation processes and evolutionary histories of galaxies. In order to decide between different scenarious ... -
The Stochastic Intergalactic Attenution and its Impact on High-Redshift Galaxies
(2007-09-25)The effect of the absorption in the intergalactic medium due to neutral hydrogen randomly distributed along the line-of-sight -- in the form of Lyman-$\alpha$ absorbers -- on the photometric ... -
Physical processes of the CO2 hydrate formation and decomposition at conditions relevant to Mars
(2005-06-27)This thesis is concerned with the formation and decomposition kinetics, as well as with the microstructure of CO2 hydrate at conditions relevant to those on the Martian surface and in the ...