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Pore-scale petrophysical models for the simulation and combined interpretation of nuclear magnetic resonance and wide-band electromagnetic measurements of saturated rocksToumelin, Emmanuel. January 1900 (has links) (PDF)
Thesis (Ph. D.)--University of Texas at Austin, 2006. / Vita. Includes bibliographical references.
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NMR study of GaAs at high temperatureHan, Weimin, 1960- 22 January 1992 (has links)
Graduation date: 1992
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Liquid Crystal State NMR Quantum Computing - Characterization, Control and CertificationTrottier, Denis-Alexandre January 2013 (has links)
Quantum computers offer the possibility of solving some problems more efficiently than their classical counterparts. The current forerunner in the experimental demonstration of quantum algorithms is Nuclear Magnetic Resonance (NMR). Known for its implementations at liquid state, NMR quantum computing consists of computing on nuclear spins. In the liquid crystal state, dipolar couplings are available, offering an increased clock frequency and a faster recycling of algorithms. Here investigated is the cost at which this comes, namely, a more complicated internal Hamiltonian, making the system harder to characterize and harder to control. In this thesis I present new methods for characterizing the Hamiltonian of dipolar coupled spin systems, and I report experimental results of characterizing an oriented 6-spin system. I then present methods and results concerning the quantum optimal control of this same spin system. Finally, I present experiments and simulations regarding the certification of computational quantum gates implemented in that same dipolar coupled spin system.
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Solid-State NMR Investigations of 67Zn and 27Al Nuclei in Zinc-Amino Acid Complexes, Zinc-Insulin Hexamers, and Aluminum-Centered DyesMroue, Kamal January 2010 (has links)
Modern solid-state nuclear magnetic resonance (NMR) methodologies are applied to investigate two spin-5/2 nuclei, Zn-67 and Al-27, in different coordination environments in order to characterize the magnitudes and orientations of their electric field gradient (EFG) and nuclear magnetic shielding tensors. The advantages of using high (21.1 T) applied magnetic fields for detecting Zn-67 directly at ambient temperatures, using the quadrupolar Carr-Purcell Meiboom-Gill (QCPMG) pulse sequence and the stepped-frequency technique, are demonstrated by the successful investigation of the different zinc sites in several zinc-amino acid coordination compounds, and in the more complex polymorphs of the zinc-insulin hexamers. In all systems, the high-field Zn-67 NMR spectra are dominated only by the quadrupolar interaction.
The first two Zn-67 NMR spectra of pentacoordinated zinc sites are reported and analyzed.
The experimental results are corroborated by ab initio and density functional theory (DFT) calculations of the Zn-67 NMR parameters in order to gain better understanding of the zinc local electronic environments.
Solid-state Al-27 NMR is applied to study three commercial aluminum-phthalocyanine dyes. Solid-state Al-27 NMR experiments, including multiple-quantum magic-angle-spinning (MQMAS) and quadrupolar Carr-Purcell Meiboom-Gill (QCPMG),
are employed at multiple high magnetic field
strengths (11.7, 14.1 and 21.1 T) to determine the composition and number of aluminum distinct sites in these dyes. The quadrupolar parameters for each Al-27 site are determined from spectral simulations, with quadrupolar coupling constants ranging from 5.40 to 10.0 MHz and asymmetry parameters ranging from 0.10 to 0.50, and compare well with the results of quantum chemical calculations of these tensors. The
largest Al-27 chemical shielding anisotropy (CSA), with a span of 120 ppm, observed directly in a solid
material is also reported. The combination of MQMAS and computational chemistry are used to interpret the presence of
multiple aluminum sites in two of the three samples.
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Solid-State NMR Investigations of 67Zn and 27Al Nuclei in Zinc-Amino Acid Complexes, Zinc-Insulin Hexamers, and Aluminum-Centered DyesMroue, Kamal January 2010 (has links)
Modern solid-state nuclear magnetic resonance (NMR) methodologies are applied to investigate two spin-5/2 nuclei, Zn-67 and Al-27, in different coordination environments in order to characterize the magnitudes and orientations of their electric field gradient (EFG) and nuclear magnetic shielding tensors. The advantages of using high (21.1 T) applied magnetic fields for detecting Zn-67 directly at ambient temperatures, using the quadrupolar Carr-Purcell Meiboom-Gill (QCPMG) pulse sequence and the stepped-frequency technique, are demonstrated by the successful investigation of the different zinc sites in several zinc-amino acid coordination compounds, and in the more complex polymorphs of the zinc-insulin hexamers. In all systems, the high-field Zn-67 NMR spectra are dominated only by the quadrupolar interaction.
The first two Zn-67 NMR spectra of pentacoordinated zinc sites are reported and analyzed.
The experimental results are corroborated by ab initio and density functional theory (DFT) calculations of the Zn-67 NMR parameters in order to gain better understanding of the zinc local electronic environments.
Solid-state Al-27 NMR is applied to study three commercial aluminum-phthalocyanine dyes. Solid-state Al-27 NMR experiments, including multiple-quantum magic-angle-spinning (MQMAS) and quadrupolar Carr-Purcell Meiboom-Gill (QCPMG),
are employed at multiple high magnetic field
strengths (11.7, 14.1 and 21.1 T) to determine the composition and number of aluminum distinct sites in these dyes. The quadrupolar parameters for each Al-27 site are determined from spectral simulations, with quadrupolar coupling constants ranging from 5.40 to 10.0 MHz and asymmetry parameters ranging from 0.10 to 0.50, and compare well with the results of quantum chemical calculations of these tensors. The
largest Al-27 chemical shielding anisotropy (CSA), with a span of 120 ppm, observed directly in a solid
material is also reported. The combination of MQMAS and computational chemistry are used to interpret the presence of
multiple aluminum sites in two of the three samples.
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Liquid State Nuclear Magnetic Resonance Spectroscopic Investigation of Phosphorus Metabolism during Germination of Sesamum indicum SeedChuang, Wei-gang 05 November 2010 (has links)
none
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The 13C, 1H Nuclear Magnetic Resonance Relaxation Studies of Dynamics of Amino Acids and ProteinsHuang, Sheng-shiung 13 August 2008 (has links)
"none"
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NMR characterization of changes in the apparent diffusion coefficient of water following transient cerebral ischemiaSilva, Matthew S. January 2002 (has links)
Thesis (Ph. D.)--Worcester Polytechnic Institute. / Keywords: NMR; diffusion coefficient; cerebral ischemia; diffusion weighted imaging. Includes bibliographical references.
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O17 spin-lattice relaxation solid state NMR studies of pure and doped icesGroves, Ronald William. January 2002 (has links)
Thesis (Ph. D.)--Ohio State University, 2002. / Title from first page of PDF file. Document formatted into pages; contains xx, 128 p.; also contains graphics. Includes abstract and vita. Co-advisors: Charles H. Pennington and James V. Coe, Dept. of Chemistry. Includes bibliographical references (p. 124-128).
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NMR analysis of bovine tRNA Trp /Gong, Qingguo. January 2002 (has links)
Thesis (Ph. D.)--Hong Kong University of Science and Technology, 2002. / Includes bibliographical references (leaves 105-123). Also available in electronic version. Access restricted to campus users.
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