scholarly journals Characterization of unsaturated porous media by high-field and low-field NMR relaxometry

2009 ◽  
Vol 45 (8) ◽  
Author(s):  
L. R. Stingaciu ◽  
A. Pohlmeier ◽  
P. Blümler ◽  
L. Weihermüller ◽  
D. van Dusschoten ◽  
...  
Keyword(s):  
Porous Media ◽  
High Field ◽  
Unsaturated Porous Media ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Low Field Nmr

scholarly journals How wide is the window opened by high-resolution relaxometry on the internal dynamics of proteins in solution?

2021 ◽  
Vol 75 (2-3) ◽  
pp. 119-131
Author(s):  
Albert A. Smith ◽  
Nicolas Bolik-Coulon ◽  
Matthias Ernst ◽  
Beat H. Meier ◽  
Fabien Ferrage
Keyword(s):  
Nuclear Magnetic Resonance ◽  
High Resolution ◽  
High Field ◽  
Rotational Diffusion ◽  
Relaxation Data ◽  
Internal Dynamics ◽  
Nmr Relaxometry ◽  
Analysis Of Dynamics

AbstractThe dynamics of molecules in solution is usually quantified by the determination of timescale-specific amplitudes of motions. High-resolution nuclear magnetic resonance (NMR) relaxometry experiments—where the sample is transferred to low fields for longitudinal (T1) relaxation, and back to high field for detection with residue-specific resolution—seeks to increase the ability to distinguish the contributions from motion on timescales slower than a few nanoseconds. However, tumbling of a molecule in solution masks some of these motions. Therefore, we investigate to what extent relaxometry improves timescale resolution, using the “detector” analysis of dynamics. Here, we demonstrate improvements in the characterization of internal dynamics of methyl-bearing side chains by carbon-13 relaxometry in the small protein ubiquitin. We show that relaxometry data leads to better information about nanosecond motions as compared to high-field relaxation data only. Our calculations show that gains from relaxometry are greater with increasing correlation time of rotational diffusion.

Characterization of Porosity and Pore Size Distribution Changes in Human Compact Bone by Low-Field NMR

2000 ◽  
Author(s):  
Qingwen Ni ◽  
J. Derwin King ◽  
Xiaodu Wang
Keyword(s):  
Mechanical Strength ◽  
Compact Bone ◽  
Biomechanical Properties ◽  
Spongy Bone ◽  
Comprehensive Review ◽  
Low Field ◽  
Human Compact Bone ◽  
Direct Sensing ◽  
Low Field Nmr

Abstract Previous studies have shown that the overall porosity of bone has a significant effect on the mechanical strength of bone. In a comprehensive review on porosity of bone, Martin [1] described that small changes in porosity would lead to significant changes in the stiffness and strength of both compact and spongy bone. In a recently study, McCalden [2], reported that the porosity of bone has a significant effect to absorb energy during fracture. Since changes in numbers and sizes of these natural cavities are directly related to the remodeling processes and biomechanical properties of bone, a direct sensing technique to detect such changes in bone has been long wanted.

Characterization of the Initial Hydration Process of Ordinary Portland Cement Based on Low-Field NMR

2018 ◽  
Vol 50 (1-3) ◽  
pp. 187-198
Author(s):  
Jin-hua Huo ◽  
Zhi-gang Peng ◽  
Zhongbin Ye ◽  
Qian Feng ◽  
Yong Zheng ◽  
...  
Keyword(s):  
Portland Cement ◽  
Ordinary Portland Cement ◽  
Hydration Process ◽  
Low Field ◽  
Low Field Nmr

Capillary Trapping of CO 2 in Sandstone Using Low Field NMR Relaxometry

2019 ◽  
Vol 55 (12) ◽  
pp. 10466-10478 ◽  
Author(s):  
Paul R. J. Connolly ◽  
Sarah J. Vogt ◽  
Mohamed Mahmoud ◽  
Christopher N. Y. Ng ◽  
Eric F. May ◽  
...  
Keyword(s):  
Capillary Trapping ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Low Field Nmr

In-situ heavy oil viscosity prediction at high temperatures using low-field NMR relaxometry and nonlinear least squares

Fuel ◽  
2020 ◽  
Vol 260 ◽  
pp. 116328 ◽  
Author(s):  
Strahinja Markovic ◽  
Jonathan L. Bryan ◽  
Aman Turakhanov ◽  
Alexey Cheremisin ◽  
Sudarshan A. Mehta ◽  
...  
Keyword(s):  
Least Squares ◽  
High Temperatures ◽  
Heavy Oil ◽  
Nonlinear Least Squares ◽  
Oil Viscosity ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Viscosity Prediction ◽  
Low Field Nmr

scholarly journals Qualification of automated low-field NMR relaxometry for quality control of polymers in a production setting

2007 ◽  
Vol 26 (8) ◽  
pp. 1015-1024 ◽  
Author(s):  
Sarah C. Chinn ◽  
Angela Cook-Tendulkar ◽  
Robert Maxwell ◽  
Hilary Wheeler ◽  
Mark Wilson ◽  
...  
Keyword(s):  
Quality Control ◽  
Low Field ◽  
Nmr Relaxometry ◽  
Low Field Nmr
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