Faculties of University Bonn: Browsing Fakultäten der Universität Bonn by Author "Urbach, Carsten"
Now showing items 1-18 of 18
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Advanced Image Reconstruction Methods for Ultra-High Field MRI
Schwarz, Jolanda M. (2020-07-07)Magnetic resonance imaging (MRI) has become a very powerful and flexible medical imaging technique, that allows an unrivaled insight into human anatomy and physiology. For a wide range of possible applications, acquisition ... -
Analyse komplexer dynamischer Systeme durch Charakterisierung retardierter, gerichteter und gewichteter Interaktionen
Dickten, Henning (2017-11-27)Die Erforschung der Dynamik ausgedehnter komplexer Systeme stellt seit jeher eine der großen Herausforderungen in verschiedenen Bereichen der Wissenschaft dar, von Physik, über Informatik, Biologie, Geowissenschaften und ... -
K-K and π-K Scattering Lengths at Maximal Isospin from Lattice QCD
Helmes, Christopher (2019-08-02)The current work presents calculations of the elastic scattering length <em>a</em><sub>0</sub> for systems of two Kaons and one pion and one Kaon, respectively. The values for <em>a</em><sub>0</sub> have been obtained from ... -
The Fluctuating Gap Model
Cao, Xiaobin (2011-02-10)The quasi-one-dimensional systems exhibit some unusual phenomenon, such as the Peierls instability, the pseudogap phenomena and the absence of a Fermi-Dirac distribution function line shape in the photoemission spectroscopy. ... -
Hadron-Hadron Interactions from Nf = 2+1+1 Lattice QCD: The ρ-resonance
Werner, Markus Alexander Oliver (2020-01-07)In this work the calculation of the <em>ρ</em> resonance's decay parameters with <em>N<sub>f</sub> = 2+1+1</em> flavour lattice QCD is presented. The calculation is performed based on gauge configuration ensembles produced ... -
The Hubbard Model on the Honeycomb Lattice with Hybrid Monte Carlo
Ostmeyer, Johann (2021-11-09)We take advantage of recent improvements in the grand canonical Hybrid Monte Carlo (HMC) algorithm, to perform a precision study of the single-particle gap in the hexagonal Hubbard model, with on-site electron-electron ... -
Imaging Meningiomas: The Road to the First Medical Application of the Novel Magnetic Resonance Rheology
Theilenberg, Sebastian (2017-04-25)In this thesis the first application of Magnetic Resonance Rheology (MRR) to patients with known brain lesions was presented.<br /> MRR is a novel approach to image the mechanical properties of brain tissue in vivo. It ... -
Lorentzkraftbildgebung: MR-basierte Darstellung Neuronaler Aktivität in Echtzeit
Bindl, Jakob (2019-02-12)In dieser Arbeit wurde eine neue Methode zur Darstellung neuronaler Aktivität in Echtzeit vorgestellt. Dabei wird die Lorentzkraft, die auf die elektrischen Ladungsträger aktiver Nervenzellen im Magnetfeld eines MR-Tomographen ... -
Magnetic Resonance Rheology on Phantoms and Human Brains
Kofahl, Anna-Lisa (2017-07-05)In this thesis first systematic measurements on phantoms and human brains using Magnetic Resonance Rheology (MRR) are presented and means to evaluate the acquired data are investigated.<br /> MRR is a novel technique ... -
MR-Phasenbilder ultraschallinduzierter Verschiebungsfelder an Brustläsionen
Wild, Judith Charlotte (2017-09-15)In dieser Arbeit wurde eine Methode erforscht, die die Uktraschalstrahlungskraft mit der MRT kombiniert.<br /> Durch die Schallstrahlungskraft werden im Gewebe Verschiebungen hervorgerufen. Diese lieferten einen Kontrast ... -
Properties of pseudoscalar flavor singlet mesons from lattice QCD
Ottnad, Konstantin (2014-02-18)The central topic of this work are masses and mixing parameters of the η-η' system, which are investigated within the framework of Wilson twisted mass lattice QCD, using gauge configurations provided by the European Twisted ... -
Quark-mass dependence of pion scattering amplitudes
Niehus, Malwin Leonard Berengar (2022-07-11)We analyze lattice-QCD data of the ππ → ππ P wave obtained at unphysical-high pion masses with the inverse-amplitude method at next-to-leading order and at next-to-next-to-leading order. We then extrapolate to the ... -
Rheologie im Kopf
Ulucay, Deniz (2015-02-26)In dieser Arbeit wird eine Methode präsentiert, welche die ortsaufgelöste Untersuchung viskoelastischer Eigenschaften von Hirngewebe ermöglicht.<br /> Es werden drei Prototypen und deren elektropneumatische Ansteuerung ... -
Simulation of Bone Remodeling Process around Dental Implant During the Healing Period
Çelik, Salih (2021-07-05)This interdisciplinary thesis deals with the numerical investigation of bone remodeling around dental implants during the healing period with regard to biomechanical aspects. The aim of the study was to develop algorithms ... -
Spin and Flavour dependent Interactions within a Quark Model for Baryons
Ronniger, Michael (2013-06-14)Within the framework of a relativistic covariant quark model the effects of two novel quark interactions on the light-flavoured baryon mass spectra as well as on a multitude of observables, such as electroweak form factors, ... -
Synchronization phenomena in complex networks of pulse-coupled oscillators: self-generated changes between randomness and order
Rothkegel, Alexander (2014-03-19)Complex network comprised of interconnected oscillatory systems are investigated in various contexts in the natural sciences. It is an important goal to understand in which way synchronization phenomena in such networks ... -
Three Pion Scattering at Maximal Isospin from Lattice QCD at Physical Mass
Ueding, Martin (2021-01-07)In this work the scattering of two pions in $I = 2$ and three pions in $I = 3$ is analyzed with lattice QCD. The process is computed on three Wilson clover twisted mass ensembles generated by the ETMC with total momentum ... -
Unusually warm winter seasons may compromise the performance of current phenology models: Predicting bloom dates in young apple trees with PhenoFlex
Fernandez, Eduardo; Schiffers, Katja; Urbach, Carsten; Luedeling, Eike (2022-07-15)Phenology models are crucial tools for assessing climate change impacts in forestry, ecology and agriculture. Such models are typically calibrated with observational or experimental data and validated with a set of independent ...