Auflistung Alle Publikationen nach Schlagwort "Radioastronomie"
Anzeige der Dokumente 1-10 von 10
-
Akusto-optische Signalverarbeitung mit dem Material Rutil
(Univ. Köln, 2006)In der Radioastronomie und in der Atmosphärenforschung erlauben moderne Heterodyn-Empfangssysteme die Beobachtung von Atom- und Molekülübergangslinien mit ZF-Bandbreiten von bis zu 4 GHz. Zur Abdeckung dieser großen ... -
Broadband IF circuits for superconductor isolator superconductor (SIS) mixers for the Heterodyne Instrument for the far infrared on the Herschel Space Observatory and for sideband separating mixers
(Univ. Köln, 2007)This thesis describes the development and manufacturing of the IF circuits for two different heterodyne receivers used for sub-mm radio astronomy. The first project is the broadband 4-8 GHz IF circuitry for the mixer units ... -
Development of ultrathin niobium nitride and niobium titanium nitride films for THz hot-electron bolometers
(Univ. Köln, 2005)The main focus of this work is the development of ultrathin NbN and NbTiN films. A reproducible and reliable deposition process for ultrathin NbN and NbTiN films for the use in phonon-cooled HEB devices was established. ... -
Masses of small bodies - mass estimation of small solar system bodies using radio science data from close flybys
(Univ. Köln, 2010)The Radio Science technique enables to estimate the mass and other gravitational parameters of a solar system body from spacecraft observations very precisely. It uses the radio link between ground station and spacecraft. ... -
Multi-telescope studies of neutron stars
(Univ. Köln, 2009)Neutron stars are unique stellar remnants with extreme properties, as their density and magnetic field. Their study can be the key to a number of unanswered problems in fundamental physics and astronomy, ranging from stellar ... -
On the influence of local inhomogeneities on cosmological observables - from galaxies to the microwave background
(Univ. Bielefeld, 2007)Despite the good consistency of the cosmological standard model with the bulk of present observations, a number of unanticipated features have recently been detected within large-angle data of the Cosmic Microwave Background. ... -
Periodic variability in active galactic nuclei
(Univ. Köln, 2008)In this doctoral thesis, multi-frequency very long baseline interferometry observations together with multi-frequency total flux-density variability data of compact relativistic jets in active galactic nuclei are presented ... -
Photonische Lokaloszillatoren für Anwendungen in der Terahertz-Radioastronomie
(Univ. Duisburg, 2006)Photonic Local Oscillators (PLOs) operating at optical wavelengths around 1550 nm have a major importance especially for radio astronomic THz Antenna arrays like the "Atacama Large Millimeter/Submillimeter Array" (ALMA) ... -
Properties of quasistellar objects and their progenitors in the radio and mm wavelength regimes in the context of ULIRG-to-QSO evolution
(Univ. Köln, 2010)The thesis at hand presents the results of a study of galaxies with active galactic nuclei (AGN) carried out in the radio and mm wavelength regimes at low and high angular resolutions. The studied objects cover a broad ... -
Superconducting hot electron bolometers on silicon nitride membranes for terahertz waveguide mixers
(Univ. Köln, 2004)The topic of this work is the development of Hot Electron Bolometer (HEB) mixers on freestanding membrane substrates for terahertz high resolution heterodyne receiver systems. The radio astronomy in the THz frequency ...