Results 271 to 280 of about 184,530 (301)

Application of low field NMR T2 measurements to clathrate hydrates

Journal of Magnetic Resonance, 2009
Low field (2 MHz) Nuclear Magnetic Resonance (NMR) proton spin-spin relaxation time (T(2)) distribution measurements were employed to investigate tetrahydrofuran (THF)-deuterium oxide (D(2)O) clathrate hydrate formation and dissociation processes. In particular, T(2) distributions were obtained at the point of hydrate phase transition as a function of ...
Shuqiang, Gao, Walter G, Chapman, Waylon, House   +2 more
openaire   +2 more sources

Porosity Distributions in Carbonate Reservoirs Using Low-Field NMR

Journal of Canadian Petroleum Technology, 2002
Abstract Alberta contains significant deposits of oil and gas in carbonate formations. Carbonates tend to have fairly tight matrix structures, resulting in low primary porosity and permeability. Laboratory characterization of carbonate properties is a slow and tedious process, however, core data is often collected ...
A. Mai, A. Kantzas
openaire   +1 more source

Sensitivity enhancement and low-field spin relaxation in singlet NMR

Physical Chemistry Chemical Physics, 2012
The singlet states of nuclear spin-1/2 pairs often display extended lifetimes that can be an order of magnitude longer than conventional relaxation times. We show that, in favourable circumstances, acquisition of the NMR signal during an extended multiple spin-echo train, followed by suitable data processing, enhances the signal-to-noise ratio of ...
Bocan, Jiri, Pileio, Giuseppe, Levitt, Malcolm H.   +2 more
openaire   +3 more sources

Improved determination of FID signal parameters in low-field NMR

Journal of Magnetic Resonance, 2010
In this work, novel methods are suggested for assessing signal parameters of the free induction decay (FID) in nuclear magnetic resonance (NMR) experiments. The FID signal was recorded in a microtesla field and analysed to determine its relaxation time, amplitude, Larmor frequency and phase.
Dabek, Juhani, Nieminen, Jaakko O., Vesanen, Panu T., Sepponen, Raimo, Ilmoniemi, Risto, J.   +5 more
openaire   +4 more sources

Low-field NMR

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

A novel method for semi-quantitative analysis of hydration degree of cement by 1H low-field NMR

Cement and Concrete Research, 2021
Zhenping Sun, Jingbin Yang, Yanliang Ji   +2 more
exaly  

A comparative evaluation of low-field and high-field NMR untargeted analysis: Authentication of virgin coconut oil adulterated with refined coconut oil as a case study

Analytica Chimica Acta, 2023
Fenfen Tang, Cameron Rich, Emmanuel Hatzakis   +2 more
exaly  

Applications of Low-Field NMR to Food Science

2006
Publisher Summary This chapter presents the developments in low-field nuclear magnetic resonance (NMR) that have the potential of revolutionizing quality control in the food sector. This includes new NMR devices such as ex situ NMR probes, on-line sensors, new ultrafast analytical methods, and multidimensional approaches to relaxometry and ...
openaire   +1 more source

Process and reaction monitoring by low-field NMR spectroscopy

Progress in Nuclear Magnetic Resonance Spectroscopy, 2012
Dalitz, F., Cudaj, M., Maiwald, M., Guthausen, G.   +3 more
openaire   +3 more sources

A Low-field-NMR Capillary Rheometer

2009
Dirk Mertens, Edme H. Hardy, Bernhard Hochstein, Gisela Guthausen   +3 more
openaire   +1 more source