Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Ronneberger, Dirk Prof. Dr."
Now showing items 1-20 of 34
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Struktureigenschaften und molekulare Dynamik flüssiger Ethylenglykol-Oligomere und ihrer Mischungen mit Wasser
(2007-08-14)The dynamics of chain isomerization in melts of ethylene glycol oligomers with molar masses between 62 and 600 g/mol are studied by means of broadband ultrasonic absorption measurements in ... -
Akustische Beeinflussung einer Instabilität in Kanälen mit überströmten Resonatoren
(2006-09-01)The sound-flow interaction in an acoustically lined section of an otherwise rigid duct is investigated. Turbulent fluctuations or imposed oscillations of the flow at the inlet of the lined ... -
Ultraschallspektrometrie zum dynamischen Verhalten von Domänen in peptidhaltigen Lipidmembranen
(2005-08-05)In this thesis the influence of peptides on lipid membranes in vicinity of the main phase transition is investigated using ultrasonic spectrometry. For these experiments unilamellar vesicles ... -
Strukturbildung und Turbulenz
(2005-06-24)This work makes a contribution to the understanding of turbulent convection flows by numerically studying Rayleigh-Bénard convection in a fluid layer heated from below between two rigid ... -
Synchronisation chaotisch fluktuierender Halbleiterlaser
(2005-05-04)In this thesis the experimental and numerical synchronization of two optically coupled semiconductor lasers are presented. Of main interest is the synchronization of the well-known low ... -
Modenstruktur und adaptive Regelung der Strahl-Kanten-Strömung
(2005-02-14)The stabilization of the plane laminar jet-edge-flow is studied with the general objective to gain some gerneral experience with flow control. The convective instability of the jet combined ... -
Anregbarkeit der Kelvin-Helmholz-Instabilität in der freien Scherströmung hinter einer scharfen Kante
(2004-11-29)The generation and compensation of instability waves in the detached free shear layer behind the trailing edge of a splitterplate that separated to regions with different flow velocities, ... -
Breitbandige Ultraschallabsorptionsspektroskopie an wässrigen Kohlenhydrat-Lösungen
(2004-07-29)This thesis investigates conformational kinetics of disaccharides in aqueous solutions. For this purpose, ultrasonic attenuation spectra of disaccharides in water have been measured in a ... -
The significance of coherent flow structures for the turbulent mixing in wall-bounded flows
(2004-07-28)For the identification and characterisation of coherent flow structures in turbulent boundary layers and for the examination of the interaction processes between these structures, a flat ... -
Cavitation and shock wave effects on biological systems
(2004-02-26)This thesis investigates the effects of cavitation and shock waves on systems of biological or medical relevance. Its main focus lies on high-speed optical observations of cavitation bubble ... -
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 ... -
Untersuchung von Einzel- und Mehrblasensystemen in akustischen Resonatoren
(2003-12-16)Acoustically driven bubbles in a liquid perform volume oscillations and translational motion. In standing sound fields the bubbles form complex spatio-temporal structures (acoustic ... -
Breitbandige Ultraschallabsorptionsspektroskopie an wässrigen ionischen Tensid-Lösungen im Frequenzbereich von 100kHz bis 2GHz
(2003-08-12)Liquids play an important role in animated nature, especially in physical chemistry and biology. On molecular level the macroscopic physical characteristics are to be understood about liquids ... -
Diffraction of Metastable Rare-Gas Atoms from Nanostructured Transmission Gratings
(2003-05-14)Rare-gas atoms are diffracted from nanostructured silicon nitride transmission gratings. From the relative intensities of the diffraction maxima the strength of the van der Waals potential ... -
Active cancellation of 3D Tollmien-Schlichting waves in the presence of sound and vibrations.
(2002-12-13)In order to delay the laminar-turbulent transition in a boundary layer flow, the cancellation of 2D- and 3D instability waves by artificially excited counter-disturbances is investigated. ... -
Investigation of transition scenarios in boundary-layer flows
(2002-04-05)Laminar-turbulent transition mechanisms triggered by crossflow instability in three-dimensional, accelerated boundary-layer flows are investigated us- ing numerical methods of stability analysis. The investigations are ... -
Zeitlich modulierte Statistik der periodisch gestörten turbulenten Kanalströmung
(2002-03-25)The turbulent channel flow is subjected to a temporal change of the boundary conditions, either by periodic variation of a longitudinal wall speed or, alternatively, by periodic variation ... -
Amplituden- und phasenaufgelöste Polariton-Pulspropagation in GaAs bei niedrigen und mittleren Elektron-Loch-Plasmadichten
(2002-03-01)High resolution amplitude and phase measurements with interferometric crosscorrelation are reported on polariton pulse progapation through ultrapure Galliumarsenide. The measurement technique and various pump and probe ...