Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Charles H. Pennington"'
Publikováno v:
Chemical Physics. 315:1-7
This paper gives results from NMR experiments measuring the dynamics of proton motion in various ice samples. Specifically, we measure 17 O spin-lattice relaxation rates ( T 1 ) for pure ice, and for HCl and KOH-doped ices. For pure ice, a plot of Ln
Publikováno v:
Journal of Magnetic Resonance. 170:252-256
Inadequate signal-to-noise ratio is a major factor limiting applications of magnetic resonance microscopy. The “Diffusion Enhancement of Signal and Resolution” (DESIRE) scheme promises potential sensitivity enhancements of between one and three o
Publikováno v:
Progress in Nuclear Magnetic Resonance Spectroscopy. 42:69-93
Autor:
Charles H. Pennington
Publikováno v:
Concepts in Magnetic Resonance. :71-79
The prospects for and practical requirements of the “diffusion enhancement of signal and resolution” (DESIRE) scheme proposed by Lauterbur as a method to enhance the sensitivity, spatial resolution, and contrast in magnetic resonance (MR) microsc
Publikováno v:
Concepts in Magnetic Resonance. 15:189-200
Magnetic resonance imaging (MRI) microscopy requires very strong gradients (>10 T/m) that can be rapidly switched between positive and negative gradient fields. A gradient power supply is presented that is capable of pulsing a custom built triaxial m
Publikováno v:
Journal of Magnetic Resonance. 158:178-182
The technique of magnetic resonance imaging microscopy holds promise of bringing the full capabilities of NMR to arbitrarily specified positions within spatially inhomogeneous systems, including biological cells, yet the possibilities are limited by
Publikováno v:
Review of Scientific Instruments. 71:2908-2913
Microcoil nuclear magnetic resonance (NMR), using receiver coils of diameters of order 100 μm, is increasingly employed to observe very small (∼0.3 nl) samples with high sensitivity. However, many experimental aspects of microcoil NMR differ great
Publikováno v:
Physical Review Letters. 83:3924-3927
We report spin-echo double resonance NMR measurements of {sup 17}O- {sup 63} Cu indirect (electron-mediated) nuclear spin-spin coupling between Cu and O atoms in the CuO{sub 2} planes of YBa{sub 2}Cu {sub 3}O{sub 7} . The magnitude of the measured co
Autor:
Charles H. Pennington, J. A. Martindale, L. Hults, J. L. Smith, O. M. Vyaselev, V. A. Nandor, R. W. Groves
Publikováno v:
Physical Review B. 60:6907-6915
We report measurements of ${}^{17}\mathrm{O}$ and ${}^{89}\mathrm{Y}$ NMR Knight shift and ${(T}_{1}{T)}^{\ensuremath{-}1}$ for temperatures ranging from ${T}_{c}$ up to 700 K. The contrasting behaviors of ${}^{17}\mathrm{O},$ ${}^{89}\mathrm{Y},$ an
Publikováno v:
Journal of Solid State Chemistry. 143:254-259
The known mineral rodalquilarite, H{sub 3}Fe{sub 2}(TeO{sub 3}){sub 4}Cl, was obtained as high quality single crystals via hydrothermal reactions. This material crystallizes in the triclinic space group P{bar 1}, with cell constants of a = 5.103(2) {