Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 17 of 17 for “"Kernresonanz"”.
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Ein- und zweidimensionale Hadamard-Kernresonanz-Spektroskopie
The goal of this thesis was to develop new methods in the field of stochastic nuclear magnetic resonance (NMR). Based on an optimized implementation of the stochastic technique, it was possible to extend the detectable bandwidth to a maximum value of 300.000 - 400.000 Hz, so that a series of new …
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Deuteronen-Kernresonanz-Untersuchungen an flüssigkristallinen Polymeren : Kollektive Bewegungen, Direktordynamik und viskoelastische Eigenschaften
… Haupt-Seitenketten-Polymeren werden Deuterium-Kernresonanz (NMR)-Untersuchungen zur molekularen Dynamik durchgeführt. Besonderes Interesse gilt dabei der Dynamik in der nematischen Phase dieser flüssigkristallinen Systeme. Die Analyse von Carr-Purcell-Meiboom-Gill (CPMG)-Experimenten zeigt, …
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Deuteronen-Kernresonanz-Untersuchungen der viskoelastischen Eigenschaften von nematischen Flüssigkristallen mit zwei mesogenen Gruppen
… von Dimeren in der nematischen Phase mit Kernresonanz-(NMR)-Methoden untersucht. <br>Durch die Kombination dreier unterschiedlicher NMR-Experimente, der Messung der transversalen Kernspinrelaxation im Carr-Purcell-Meiboom-Gill-(CPMG)-Experiment, NMR bei langsamer Probenrotation senkrecht …
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Warten auf die Transkription: Die humanen Elongationsfaktoren NELF und DSIF
… RRM-Domäne von NELF E wurde mittels magnetischer Kernresonanz (NMR) bestimmt (PDB: 2BZ2) und besteht aus einem viersträngigen Faltblatt mit zwei alpha-Helices, die gegen eine Seite des Faltblattes packen. An der RNA-Bindung sind die zentralen beta-Stränge mit den beiden aromatischen Resten Tyr43 …
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Fluid dynamics of single levitated drops by fast NMR techniques
Liquid-liquid extraction processes are often found in industrial applications when a bulk phase needs to be purified from dissolved components. The strategy of extraction consists of dissolving the impurities into a second, carrier phase, with optimal extraction performance being guaranteed by …
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Anwendungen der NMR-MOUSE in Prozesstechnik, Materialforschung und Medizin
With the use of the NMR-MOUSE (Nuclear Magnetic Resonance – Mobile Universal Surface Explorer), a small, mobile magnetic resonance sensor, by which the information typically contained in one pixel of an NMR image, information can be collected either in situ or ex situ. This dissertation reveals new …
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Halogen-, Azid- und Koordinationsverbindungen des Phosphors
… und [(C6F5)NP(N3)3]2 dargestellt werden. Durch Kernresonanz- und Schwingungsspektroskopie konnte gezeigt werden, daß [PhNP(N3)3]2 sowohl in Lösung als auch im Festkörper als dimere Verbindung zweier monomerer PhNP(N3)3-Einheiten vorliegt, während das analoge Pentafluorphenylderivat durch die …
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Structure property relationships in polyolefins
Changes in the amount of the rigid, semi-rigid, and soft fractions, chain dynamics, and domain thickness of isotactic polypropylene (iPP) were investigated as a function of temperature, storage temperature, storage time, draw ratio, drawing temperature, drawing rate, ethylene propylene rubber …
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NMR von rotatorischer und translatorischer Dynamik
The dissertation describes detection methods for different dynamical phenomena. Rotational as well as translational motion is studied using similar theoretical approaches. A new method for the analysis of rotational dynamics is described that allows the computation of angular displacement …
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Mobile NMR for rock porosity and permeability
Three different mobile Nuclear Magnetic Resonance (NMR) core-scanners were used to measure porosity and permeability of water-saturated drill cores and core plugs in a non-destructive way. In addition to their use in the laboratory, the small and light-weight devices are conveniently shipped, e.g. …
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NMR-Bildgebung an fallenden Filmen und reaktiven Gelkugeln
In this work the advanced features of NMR imaging (magnetic resonance imaging, MRI) were used to investigate two different systems. The first system was a fluid film running down a vertical plate. The second system was a sphere made from alginate gel in which an enzymatical driven reaction from …
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Vergleich zweier MRT-Kontrastmittel mit unterschiedlicher T1-Relaxivität zur Gefäßdarstellung bei Patienten mit abdominellen Aortenaneurysmen
The aim of this tripartite work is the comparison of different paramagnetic contrast agents in the examination of the infrarenal arterial vascular tree in magnetic resonance imaging (MRI) at 1.5 T in a group of patients with infrarenal aortic aneurysms. The two gadolinium-based contrast agents used …
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Xenon NMR with spectroscopic, spatial, and temporal resolution
129Xe NMR has found many applications in material sciences and medicine because of two useful properties of Xenon atoms for NMR: the sensitivity to their environment due to their highly polarizable electron cloud, which results in a wide range of chemical shifts, and the ability of being …
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A low-field NMR tool for soil moisture
Due to the increasing need in hydrology for techniques which could measure partial saturation of soils in a non-invasive way, the development of a low-field NMR sensor has been undertaken in this dissertation. Based on prior designs of low-field NMR instruments like the NMR-MOUSE and the well …
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Nuclear magnetic resonance as a tool for on-line catalytic reaction monitoring
Nuclear Magnetic Resonance (NMR) has become a well-established method in many different areas of research. The scope of the disciplines involved is extremely broad ad is still expanding, encompassing chemical, petrochemical, biological and medical research, plant physiology, aerospace engineering, …
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Science and history explored by nuclear magnetic resonance
Nuclear Magnetic Resonance was chosen as the main tool for investigating different biological and chemical systems, as it is unique in providing the information details about the morphology and molecular structures and conformations by which the fundamental properties of these biological and …
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Entwicklung und Charakterisierung von mikrostrukturierten Planarspulen für Kernspinresonanz-Anwendungen
Systems based on nuclear magnetic resonance have become indispensable to analyse non-metallic specimen. Magnetic resonance imaging methods can resolve a specimen structure with a micrometer-scale resolution. A major part of the current systems uses magnetic fields of several Teslas. This allows the …