Faculties of University Bonn: Search
Now showing items 51-60 of 75
Dense Cores in Galactic Cirrus Clouds
(2005)
In this thesis I study the formation and evolution of dense cores in cirrus clouds. Cirrus clouds are diffuse and translucent molecular clouds widely spread within the galaxy. Dense cores in molecular clouds are the locations ...
The Low-Resolution DRAO Survey of Polarized Emission at 1.4 GHz
(2005)
This thesis deals with the realization and analysis of a new polarization survey of the northern sky at a frequency of 1.4 GHz. Survey observations were carried out using the DRAO 26-m telescope and are absolutely calibrated. ...
Measuring Radio Emission from Cosmic Ray Air Showers with a Digital Radio Telescope
(2006)
The earth is continously bombarded by highly energetic particles, the cosmic radiation. Even 90 years after their discovery the origin and acceleration of the highest energy particles is still unknown. Air showers from ...
Grand-Design Warps in Galactic Disks
(2006)
Warping, a bending of the disk, is present in all disk galaxies. It is hence a phenomenon that should not be missed to be explained in theories of galactic evolution and formation. Warps usually occur at radii where the ...
Cosmological Parameters from Second- and Third-Order Cosmic Shear Statistics
(2006)
The weak gravitational lensing effect caused by the large-scale structure of the matter in the Universe (cosmic shear) is a powerful tool to study the matter distribution on very large scales. Cosmic shear surveys provide ...
Investigations of Intraday Variable Blazar Cores and the Connected Interstellar Medium
(2006)
The work presented here is an attempt to shed further light upon the phenomenon of short-term radio variations (Intraday Variability, IDV) often observed in compact blazar cores. Three different new observational approaches ...
The Initial Conditions of High Mass Star-Formation
(2006)
Studies in the field of star formation have led to a good understanding of low mass star-formation. However there are both theoretical and observational challenges that hinder a similar understanding of high mass star-formation. ...
3D-Stadtmodellierung auf heterogenen Ausgangsmodellen mittels evolutionärer Algorithmen
(2007)
Die vorliegende Arbeit beschreibt ein neuartiges Verfahrens zur flexiblen und effizienten 3D-Stadtmodellierung im Kontext der Verfügbarmachung von 3D-Stadtmodellen. Ausgangspunkt ist die Heterogenität existierender und ...
Modellierung der dreidimensionalen Dichteverteilung des geokoronalen Neutralwasserstoffes auf Basis von TWINS Ly-Alpha-Intensitätsmessungen
(2006)
Die dreidimensionale Dichteverteilung des geokoronalen Neutralwasserstoffes der äußeren Exosphäre der Erde sowie deren zeitliche Dynamik sind nach wie vor Gegenstand der Hochatmosphärenforschung. Insbesondere die verschiedenen ...
Beobachtungen der unmittelbaren Umgebung von Supermassiven Schwarzen Löochern Millimeter-VLBI von AGN
(2006)
Mittels globaler Radiointerferometrie (Very-Long Baseline Interferometry: VLBI) ist es möglich, die unmittelbare Umgebung von Supermassiven Schwarzen Löchern zu beobachten. Die hohe Beobachtungsfrequenz von 86 GHz erlaubt ...