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Showing 1 to 20 of 182 for “"relaxation times"”.
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Measurements of Nuclear Spin Relaxation Times
Made available in DSpace on 2014-12-05T19:36:43Z (GMT). No. of bitstreams: 1 0023402.pdf: 3537078 bytes, checksum: d1f9626033076fe985729f7e3ee5c0dd (MD5) Previous issue date: 1957
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Transverse Relaxation Times of Major Brain Metabolites in Gulf War Illness
… changes in metabolite concentrations and T2 relaxation times in GWI. This protocol generated reproducible MRS results, with small inter- and intrasubject variability, on normal controls in the basal ganglia region using single voxel spectroscopy. The second aim of this thesis was to compare …
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Studies of the effects of molecular encounters on N.M.R. spin-lattice relaxation times
… on nuclear magnetic resonance spin-lattice relaxation times, with particular reference to mesitylene in mixtures with cyclohexane and TMS. The purpose of the work was to establish the best theoretical description of T1 and assess whether a recently identified mechanism (buffeting), that …
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The Use of Driven Equilibrium Conditions in the Measurement of NMR Relaxation Times
The further development of the use of NMR relaxation times in chemical, biological and medical research has perhaps been curtailed by the length of time these measurements often take. The DESPOT (Driven Equilibrium Single Pulse Observation of T1) method has been developed, which reduces the time …
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Anisotropic Spin-Lattice Relaxation Times of Trivalent Rare-Earth Ions Inanhydrous Lanthanum-Trichloride
Made available in DSpace on 2015-05-12T21:41:34Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6604241.PDF: 5144692 bytes, checksum: 9d12b7894724c82f96ac0babb4ee2a7a (MD5) Previous issue date: 1965
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Anisotropic spin-lattice relaxation times of trivalent rare earth ions in anhydrous lanthanum trichloride
… and angular dependence oft,he spin-lattice relaxation time Tl have been made for cerium, praseodymium, neodymium, samarium, terbium, and erbium , in single crystals of anhydrous lanthanum tric~loride. The experiments were performed on samples cqntaining ~ 2 at.% rpre earth doping using …
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Measurement of wall relaxation times of polarized 3He in bulk liquid 4He for the Neutron Electric Dipole Moment experiment
… Since depolarized 3He will produce a background, relaxation of the polarized 3He, characterized by the probability of depolarization per bounce, Pd , was measured for materials that will be in contact with polarized 3He. Depolarization probabilities were determined from measurements of the …
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Measurement of Wall Relaxation Times of Polarized Helium-3 in Bulk Liquid Helium-4 for the Neutron Electric Dipole Moment Experiment
The relaxation rates extrapolated from the observed values of Pd for d-TPB, coated Torlon, and coated BeCu in the nEDM apparatus were found to be consistent with design goals.
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The effects of polymer-controlled hydration on nuclear magnetic resonance parameters
… transition temperature (Tn,), the spin-lattice relaxation times and the spin-spin relaxation times were investigated as the membrane was dehydrated. Both Avg and Tn, are hydration dependent but no systematic change in the relaxation times was noted as a function of the water content of the …
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Sensitivity-enhanced nuclear magnetic resonance of biological solids
… with the electronic and nuclear spin-lattice relaxation times. Many biological systems, especially membrane proteins, have relatively short nuclear relaxation times even at 10 K. DNP experiments on fd bacteriophage and purple membrane show that significant sensitivity enhancements can still be …
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Spin coherence and optical properties of alkali-metal atoms in solid parahydrogen
… spectra, optical pumping,and longitudinal relaxation of spins in the ground state. We find a large variation in the magnitude of the ground state spin polarization from one alkali species to another; however, all the species exhibit similar longitudinal relaxation times on the order of 1 s. …
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The development and applications of Fourier transformed relaxation measurements in nuclear magnetic resonance (NMR)
… to measure the spin-lattice and spin-spin relaxation times of the various components of a multi-component spectrum. By Fourier transforming the free induction decay after the inversion recovery or spin echo pulse sequences, the different frequency components can be resolved and their …
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Magnetic resonance investigations of pH in microemulsions
… reverse micelles of the microemulsion using MR relaxation times. T_2 relaxation times of water in the CTAB and Triton-X microemulsions were found to change with pH, however, T_1 relaxation times remained unaffected. This behaviour was attributed to acid-catalysed exchange between protons of …
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Liposome Encapsulated Manganese Chloride as a Liver Specific Contrast Agent for Magnetic Resonance Imaging
… and proton nuclear magnetic resonance (NMR) relaxation were used in experiments to study the blood clearance, liver uptake and vesicle break down. The results showed that the Mn$\sp{2+}$ must be released from the vesicle and transferred to some extent to hepatocytes in order to bring about …
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A comparison of muscle damage, soreness, morphology, T2 changes and running performance following an ultramarathon race
… has focused on changes in transverse (T2) relaxation times after exercise. Given that inflammation and oedema are proposed as reasons for the changes in T2 times, there may be changes in morphological measurements such as muscle volume and peak cross sectional area. Few studies have …
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Thermodynamics of disordered C1-xCux and Si1-xAux near the metal-insulator transition
Measurements of the electron-phonon relaxation time are carried out, using both a direct and indirect method, in three dimensional films of Cl-xCUx and Si1-xAUx in the temperature range 0.3K-4K. The electron-phonon resistance and thermal boundary resistance are also measured. The directly measured …
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13C-nuclear-magnetic-resonance of carbon monoxide on platinum: Study of a highly dispersed catalyst
… Nuclear Magnetic Resonance lines, spin-lattice relaxation times Tl and spin-spin relaxation times T2 of CO chemisorbed on the surface layer of small particles of Pt metal have been observed by the method of spin echoes as a function of magnetic field, temperature, CO coverage and Pt dispersion. …
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Molecular dynamics analysis of spectral characteristics of phonon heat conduction in silicon
… Temperature and phonon frequency dependent relaxation times are extracted from the MD simulations and used to generate a detailed picture of phonon transport. It is found that longitudinal acoustic phonons have the highest contribution to thermal conductivity and that the phonon mean free …
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