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 13 of 13 for “"CPMG"”.
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Entwicklung von hochauflösenden T2-Messverfahren zur Bestimmung von dreidimensionalen Dosisverteilungen mit Hilfe der MR-Gel-Dosimetrie und deren Anwendung in der Strahlentherapie
… der Gel-Dosimetrie (Carr-Purcell-Meiboom-Gill, (CPMG)) verglichen. Mit einer modifizierten TSE-Sequenz konnte die Messzeit um einen Faktor 7 gegenüber CPMG reduziert werden. Mit TGSE wurde die Messzeit gegenüber CPMG um einen Faktor 5 reduziert verkürzt. Es konnten dabei Dosisfehler von 4,0 …
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Deuteronen-Kernresonanz-Untersuchungen an flüssigkristallinen Polymeren : Kollektive Bewegungen, Direktordynamik und viskoelastische Eigenschaften
… Die Analyse von Carr-Purcell-Meiboom-Gill (CPMG)-Experimenten zeigt, dass die transversale Deuterium-NMR-Relaxation der Polymere in dieser Phase von langsamen kollektiven Bewegungen dominiert wird. Das beobachtete Dispersionsgesetz der CPMG-Relaxationszeiten ist charakteristisch für …
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Deuteronen-Kernresonanz-Untersuchungen der viskoelastischen Eigenschaften von nematischen Flüssigkristallen mit zwei mesogenen Gruppen
… Kernspinrelaxation im Carr-Purcell-Meiboom-Gill-(CPMG)-Experiment, NMR bei langsamer Probenrotation senkrecht zum Magnetfeld und Rheo-NMR mit Kegel-Platte-Geometrie, gelingt es fünf der acht viskoelastischen Parameter einer nematischen Phase zu bestimmen. <br>Die NMR-Untersuchungen mit Hilfe des …
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Order phenomena in polymer crystallization
… Experiments: An improved NMR pulse sequence (MSE-CPMG) which consists of a combination of a magic sandwich echo (MSE) and a modified Carr-Purcell sequence (CPMG), has been used. The MSE allows the measurement of the free induction decay (fid) without signal loss from fast decaying signal of …
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Multigrid Algorithms for Massively Parallel Machines
… the <em>Chopped Parallel Multigrid</em> (<em>CPMG</em>) algorithm, reduces the computational work on the coarse grids of the multigrid hierarchy, while keeping the convergence rate per cycle almost the same. The reduction in the computational work reduces the average parallel execution time …
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Characterizing Conformational Dynamics and Catalytic Activity of Enzymes by Hydrogen-Deuterium Exchange Mass Spectrometry
… analysis, including techniques such as CPMG 2D NMR and X-ray crystallography. Herein is the study of two proteins: TEM-1 -lactamase, the most common enzyme responsible for the hydrolysis of antibiotics in gram-negative bacteria, and yeast alcohol dehydrogenase (YADH), responsible for …
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Applying Solid-state NMR Methods to the Study of Organic Shale Rocks
… with the standard Carr-Purcell-Meiboom-Gill (CPMG) method on low-field equipment, with the rapid T_2 signal decay of these components limiting access to decay information. The work presented within this thesis focusses on the development of NMR methods for improving the characterization of the …
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Dynamically Corrected Quantum Control: A Geometrical Framework
… square wave functions, such as Hahn spin echo or CPMG, have been developed to dynamically correcting the noise effects. However, implementing these ideal pulses with high fidelity is a challenging task in real experiments. In this thesis, we provide a new and simple method to explore the entire …
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Mechanistic Studies of Salt Effects on Bimolecular Electron-Transfer Reactions of Pentaamine Ruthenium Pyridyl Complexes Studied by 19F NMR Line-Broadening and T2 Spin-Echo Techniques
… both <sup>19</sup>F NMR line-broadening and CPMG T<sub>2</sub> spin-echo relaxation techniques in H<sub>2</sub>O and D<sub>2</sub>O. Over the equimolar reactants concentration range of 0.10 mM – 8.00 mM there was a definite “self-salting” rate increase arising from the increased solution …
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Developing Magnetic Resonance Based Analytics to Support Continuous Bioprocess
… at bench-scale is shown through simple one-shot CPMG experiments. Lastly, this study presents the first use of magnetic resonance imaging (MRI) velocimetry to study the flow field inside an ambr15® microscale bioreactor. MRI provides a non-invasive method for the highly accurate visualisation of …
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New experimental and theoretical tools for studying protein systems with elements of structural disorder
… proteins. Two new NMR pulse sequences, PD-CPMG and CP-HISQC, have been developed. Both experiments are well suited for studying intrinsically disordered proteins (IDPs) or intrinsically disordered regions (IDRs) under physiological conditions. These two experiments produce higher precision …
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Slice-selective parallel transmit magnetic resonance imaging at 7T
… and refocusing pulses, they better satisfy the CPMG conditions. This improves hippocampal T2-weighted image homogeneity compared to CP mode and existing dynamic RF shim optimisations. SAR constraints remain a practical limitation, particularly for our Nova 8Tx32Rx head coil lacking full VOP …
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Developing the spin qubit of the tin-vacancy center in diamond for quantum networks
Quantum technologies working towards quantum computation and quantum communication have made tremendous progress over the past few years, highlighted by the 2019 "quantum supremacy" achievement demonstrating that quantum computers can realize calculations intractable to classical computers [5]. …