The Faculty of Mathematics and Natural Sciences: Search
Now showing items 251-260 of 404
Pulsar Discoveries and their Exploitation
(2016-12-22)
Pulsars are the rapidly-rotating, highly-magnetized, neutron star remnants of the supernova explosions of massive stars. Pulsars have been used in a wide variety of studies of astronomy and physics. Of the >2500 pulsars ...
Exploring the environment of high Rotation Measure Active Galactic Nuclei through wide-band radio spectropolarimetry observations
(2016-12-21)
In this Thesis I present an observational study of a sample of radio AGN sources. I study their radio polarization properties in a wide frequency range by observing with the 100-m Effelsberg telescope and the Very Large ...
The Radio Continuum Halos of the Edge-on Galaxies NGC 891 and NGC 4565
(2016-10-13)
The halos of spiral galaxies are complex entities consisting of multiple matter components, generally including neutral and ionized gas phases, cosmic rays (CRs), dust, as well as extraplanar stars. The detection of ...
Some Aspects in Cosmological Perturbation Theory and ƒ (R) Gravity
(2016-09-08)
General Relativity, the currently accepted theory of gravity, has not been thoroughly tested on very large scales. Therefore, alternative or extended models provide a viable alternative to Einstein’s theory. In this thesis ...
Linearly polarised photon beams at the BGO-OD experiment at ELSA
(2016-11-04)
The BGO-OD experiment, located at the electron stretcher facility ELSA in Bonn, is constructed for the study of meson photo-production reactions off the nucleon. The two main detector parts of the experimental setup are a ...
Intensitäts- und Energieerhöhung an ELSA
(2015-12-04)
An der Elektronen-Stretcher-Anlage ELSA am Physikalischen Institut der Universität Bonn werden im Zuge des Sonderforschungsbereichs SFB/TR 16 “Elektromagnetische Anregung subnuklearer Systeme” Experimente zur Untersuchung ...
Investigating Anisotropies in the Local Universe with Type Ia Supernovae from the Nearby Supernova Factory
(2015-12-10)
The dipole anisotropy of the cosmic microwave background temperature is two orders of magnitude larger than its other multipole components, which is attributed to the Doppler shift due to the motion of our Local Group of ...
A μ-biomimetic uncooled infrared psensor based on the infrared receptors of Melanophila acuminata
(2016-01-05)
The pyrophilous beetle Melanophila acuminata possesses an organ sensitive to IR radiation. It employs a photomechanic detection principle: A liquid filled pressure chamber is heated by absorbing the radiation. The ...
Automated Source Extraction for the Next Generation of Neutral Hydrogen Surveys
(2015-12-23)
This thesis is a first step to develop the necessary tools to automatically extract and parameterize sources from future HI surveys with ASKAP, WSRT/Apertif, and SKA.
The current approach to large-scale HI surveys, ...
The current approach to large-scale HI surveys, ...
Determining the Neutrino Mass Hierarchy with the Precision IceCube Next Generation Upgrade (PINGU)
(2015-10-15)
In this thesis, the development of a fast effective simulation for the planned PINGU experiment at the geographic South Pole is described, which will make a precision measurement of the atmospheric neutrino flux at low GeV ...