Results 221 to 230 of about 123,565 (254)

Low-Field and Field-Cycling NMR and MRI of Cartilage

2016
Low-field experiments possess the double advantage of providing stronger relaxation contrast and feasibility of studies with small-scale, mobile scanners. Ex vivo measurements deliver high-resolution profiles that are suitable for correlating experimental parameters with corresponding magnetic resonance imaging experiments of lower spatial resolution ...
Siegfried Stapf, Carlos Mattea, Erik Rössler   +2 more
openaire   +1 more source

NMR Spectroscopy for Chemical Analysis at Low Magnetic Fields

2011
This chapter addresses the limits of low-field NMR spectroscopy for chemical analysis and will answer the question of whether high-resolution NMR spectroscopy for chemical analysis of solutions can be achieved with magnetic fields much lower than 0.1 T without losing the chemical information which at high field is derived from the chemical shift and ...
Glöggler, S., Blümich, B., Appelt, S.
openaire   +3 more sources

Quantitative Analysis of Low-Field NMR Signals in the Time Domain

Analytical Chemistry, 2001
Two novel methods are described for direct quantitative analysis of NMR free induction decay (FID) signals. The methods use adaptations of the generalized rank annihilation method (GRAM) and the direct exponential curve resolution algorithm (DECRA). With FID-GRAM, the Hankel matrix of the sample signal is compared with that of a reference mixture to ...
Nordon, A., Gemperline, P.J., McGill, C.A., Littlejohn, D.   +3 more
openaire   +4 more sources

Proton Low‐Field NMR Measurements on Crackers

Journal of Food Science, 1994
ABSTRACT We have shown that the signal obtained for crackers (3.5% water content) by low resolution NMR method using the CPMG sequence, described the relaxation of the protons of fat. For water content up to 7.1% the water signal is not seen by a CPMG sequence, the water has therefore a very short spin‐spin relaxation time (T2 < 0 ...
PASCAL DESBOIS, DENIS LE BOTLAN
openaire   +1 more source

Low field NMR investigations of methyl tunnelling

Physica B: Condensed Matter, 1994
Abstract Low-field dipole-dipole-driven NMR has been used to measure the ground state methyl tunnelling frequencies in dimethylmalonic acid ( ν t = 337 ± 3 kHz), 3-hexanone ( ν t = 210 ± 10 kHz) and 4-heptanone ( ν t = 495 ± 3 kHz).
P.M. Debenham, A.J. Horsewill, I.B.I. Tomsah, S. Clough   +3 more
openaire   +1 more source

Low Field NMR Water Cut Metering

Canadian International Petroleum Conference, 2002
Abstract We have developed a new on line water cut meter using low field Nuclear Magnetic Resonance (NMR) technology. This instrument is designed for use on heavy oil systems where conventional instruments experience difficulties.
Ian Wright, Lastockin David, Allsopp Kevin, Evers-Dakers Maureen, Kantzas Apostolos   +4 more
openaire   +1 more source

ChemInform Abstract: NMR at Low Magnetic Fields

ChemInform, 2009
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
Bernhard Bluemich, Federico Casanova, Stephan Appelt   +2 more
openaire   +1 more source

A low field NMR imager for clinical use

Journal of Physics E: Scientific Instruments, 1987
The essential design features of a vertical field 0.08 T, 3.4 MHz NMR proton imager are described. The machine was constructed in-house following successful clinical trials with a prototype 1.7 MHz imager. Based on a four-coil air-cored resistive electromagnet, the machine acquires single-slice 128*128 pixel images in about 4 min using an interleaved ...
T W Redpath, J M S Hutchison, L M Eastwood, R D Selbie, G Johnson, R A Jones, J R Mallard   +6 more
openaire   +1 more source

Evaluation of Composites Miscibility by Low Field NMR

International Journal of Polymeric Materials, 2007
Solid state nuclear magnetic resonance (NMR) is a powerful technique to analyze polymer composites. The use of proton relaxation data to evaluate the dispersity of the dispersion phase in the composite and its homogeneity are very wide. In this work PVC/silica composites were prepared using different ratios to obtain a new material to be used in ...
Maria Inês B. Tavares, Otávio Ferreira, Mônica Preto, Eduardo Miguez, Igor L. Soares, Edemilson P. da Silva   +5 more
openaire   +1 more source

Low-field NMR

Journal of Magnetic Resonance (1969), 1986
Deborah J Kerwood, Philip H Bolton
openaire   +1 more source