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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 20 of 54 for “"Pulse Sequences"”.
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Development of novel NMR pulse sequences
… structures of orgamc molecules in solution using pulse FT NMR, heteronuclear pulse sequence experiments to probe carbon-13 (13C) and proton (1H) spin systems are invaluable. The one-dimensional insensitive nucleus detected PENDANT experiment finds popular use for structure determination via …
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Analog Computation With Random Pulse Sequences
Made available in DSpace on 2014-12-08T22:24:22Z (GMT). No. of bitstreams: 1 6812072.pdf: 2717183 bytes, checksum: 055fb1595f1ee0a381d34366dd538019 (MD5) Previous issue date: 1968
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Development of Optimised Pulse Sequences for Magnetic Resonance Imaging of Tumour Metabolism
Development of efficient pulse sequences for hyperpolarised 13C imaging: Dynamic nuclear spin polarization of 13C-labeled cell substrates has enabled dynamic measurements of tissue metabolism in vivo using 13C MRSI. The principal limitation of the technique is the short lifetime of the …
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Development of pulse sequences for hyperpolarized 13C magnetic resonance spectroscopic imaging of tumour metabolism
… the imaging time and the number of excitation pulses that can be used. A single-shot 3D imaging sequence has been developed and it is shown in this thesis to generate 13C MR images in tumour-bearing mice injected with hyperpolarized [1-13C]pyruvate. The pulse sequence acquires a …
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Novel Simulation to Avoid Bias In Measurement of Hyperpolarized Pyruvate: Demonstrated In Phantom and In Vivo
… strategy can be avoided by using optimized pulse sequences. To validate these predictions, a phantom system was developed that allows controllable chemical conversion of hyperpolarized pyruvate into lactate with a variability less than 20%. Using this phantom system, studies showed that …
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MAS NMR of Nuclei with Spin S=1/2 in Polycrystalline Powders: Experiments and Numerical Simulations
… keeping the advantages of MAS, is the use of pulse sequences that reintroduce ("recouple") anisotropic dipolar coupling interactions. To access the spin-system parameters encoded in the lineshapes of MAS NMR spectra an iterative fitting approach is applied. These procedures make numerically …
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Development of Magnetic Resonance Spectroscopic Imaging Methods to Assess Tumour Metabolism
… of 1H detection, polarization transfer pulse sequences for full and partial transfer of polarization were developed. The possible sensitivity improvement with those MRSI pulse sequences was evaluated in experiments and simulations using hyperpolarized [1-13C]pyruvate, [2-13C]pyruvate, …
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Novel Chemically Selective Rapid Magnetic Resonance Imaging Techniques and the Clinical Applications
… by the development of novel imaging methods (pulse sequences), as well as by exploring the everyday clinical and research applications of these new methods. This dissertation focuses on two novel chemically selective imaging methods for the generation of high quality fat-only or water-only …
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Applying Solid-state NMR Methods to the Study of Organic Shale Rocks
… of the project is aimed at the optimization of pulse sequences which are appropriate for the investigation of shales under static (non-spinning) conditions and low magnetic fields. Various multiple-pulse sequences were explored and combined to develop new methods for identifying and quantifying …
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OCRA : a low-cost, open-source FPGA-based MRI console capable of real-time control
… played out by the MRI console, known as the pulse sequence, in real time, a feature unique to this console. For hard- ware, OCRA uses the Red Pitaya, a commercially available Zync SoC board with a dual-core ARM CPU and Xilinx FPGA. The functionality of the console has been demonstrated on the …
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The development and applications of Fourier transformed relaxation measurements in nuclear magnetic resonance (NMR)
… decay after the inversion recovery or spin echo pulse sequences, the different frequency components can be resolved and their individual relaxation times can be measured. This method has great advantages over the conventional method of analysis for multiple component decays which are very common …
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Investigations on resource-limited quantum control through NMR pulses
… We apply these ideas to strongly modulating NMR pulse sequences and study the effects of increasing resources on the fidelity and curvature.
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Investigation of Slow Dynamics in Proteins: NMR Pulse Sequence Development and Application in Triosephosphate Isomerase
… focus on the developing new dynamics detection pulse sequences based on previous Centerband-Only Detection of Exchange (CODEX) experiment and applying CODEX experiments to an enzyme system, triosephosphate isomerase (TIM), for studying the function of the millisecond dynamics in catalysis. Two …
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Electromagnetically induced transparency by NMR
… how the EIT effect can be used to store light pulses in an atomic system by coupling the light to the atomic system. One of the most elegant predictions of EIT theory is that the quantum phase of the dark state of the system remains unchanged even with a coupling between the dark state and …
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Structure determination of proteins and protein aggregates by magic-angle spinning solid-state NMR
… of AS fibrils will require combining new pulse sequences with advanced isotopic labeling schemes, and novel structure calculation methods. The techniques developed in this study will be useful in the study of other protein aggregates, as well as membrane proteins and complexes, for which …
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Depletion, quantum jumps, and temperature measurements of ⁸⁸Sr⁺ ions in a linear Paul Trap
… blue-broadening, we set up blue and red laser pulse sequences. This allowed us to observe a red spectrum with secular sidebands and calculate an ion temperature of 6.8 +4.4 / -2.2 mK.
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Tuning the coherent electron-nuclear interaction in a semiconductor quantum dot
… resonance spectroscopy and dynamical decoupling pulse sequences. Further, by selecting the mean-field nuclear polarization, the strength of the electro-nuclear interaction can be controllably varied. This in turn enables the activation rate of collective nuclear excitations – and thus the …
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Dynamics and NMR implementation of controlled-NOT gates for quantum computing
… of magnetization) by applying a selective RF pulse of constant power and variable duration. From this collection of spectra, the effective Hamiltonian of the spin system was derived and found to contain an internal Hamiltonian. In a spin system with weak coupling, the internal Hamiltonian …
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