Effect of magnetic field and iron content on NMR proton relaxation of liver, spleen and brain tissues

2014 ◽  
Vol 10 (2) ◽  
pp. 144-152 ◽  
Author(s):  
Aline Hocq ◽  
Michel Luhmer ◽  
Sven Saussez ◽  
Stéphane Louryan ◽  
Pierre Gillis ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Iron Content ◽  
Proton Relaxation ◽  
Nmr Proton Relaxation ◽  
Brain Tissues

High magnetic field NMR investigation of the spin density wave phase of TMTSF2PF6

2002 ◽  
Vol 12 (9) ◽  
pp. 389-389
Author(s):  
W. G. Clark ◽  
F. Zamborsky ◽  
B. Alavi ◽  
P. Vonlanthen ◽  
W. Moulton ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Spin Density ◽  
Density Wave ◽  
Spin Density Wave ◽  
Proton Relaxation ◽  
High Magnetic Fields ◽  
Organic Conductor ◽  
First Order ◽  
The Magnetic Field ◽  
Very High

We report proton NMR measurements of the effect of very high magnetic fields up to 44.7 T (1.9 GHz) on the spin density wave (SDW) transition of the organic conductor TMTSF2PF6. Up to 1.8 GHz, no effect of critical slowing close to the transition is seen on the proton relaxation rate (1/T1), which is determined by the SDW fluctuations associated with the phase transition at the NMR frequency. Thus, the correlation time for such fluctuations is less than $1O^{-10}$s. A possible explanation for the absence of longer correlation times is that the transition is weakly first order, so that the full critical divergence is never achieved. The measurements also show a dependence of the transition temperature on the orientation of the magnetic field and a quadratic dependence on its magnitude that agrees with earlier transport measurements at lower fields. The UCLA part of this work was supported by NSF Grant DMR-0072524.

Rapid Monitoring of Graphene Exfoliation Using NMR Proton Relaxation

Nanoscale ◽  
2021 ◽  
Author(s):  
Sofia Marchesini ◽  
Piers Turner ◽  
Keith Paton ◽  
Benjamen P Reed ◽  
Andrew John Pollard
Keyword(s):  
Particle Size ◽  
Quality Control ◽  
Quality Assurance ◽  
Industrial Scale ◽  
Proton Relaxation ◽  
Rapid Monitoring ◽  
Nmr Proton Relaxation

Graphene is now being produced on an industrial scale and there is a pressing need for rapid in-line measurements of particle size for Quality Assurance and Quality Control (QA/QC). Standardised...

Al-0.90%Fe Alloy Sectional Solidified in a Gradient Magnetic Field

2011 ◽  
Vol 299-300 ◽  
pp. 220-223
Author(s):  
Jian Feng Zhang ◽  
Qi Xian Ba ◽  
Jian Zhong Cui
Keyword(s):  
Magnetic Field ◽  
Quantum Mechanics ◽  
Iron Content ◽  
Hypoeutectic Alloy ◽  
Gradient Magnetic Field ◽  
Morphology And Structure ◽  
Physical Essence

The effect of DC gradient magnetic field and the sectional solidification on the structure of Al-Fe hypoeutectic alloy was investigated. The experiment results showed that the morphology and structure of the sample were homogenous, when it was bulk solidified without magnetic field. When the sample was sectionally solidified without magnetic field, the upper part had less iron content, bigger dendritic trunk and less interdendritic precipitate. When the sample was sectionally solidified in the gradient magnetic field, the above-mentioned differences between the upper and lower part were more prominent. The physical essence of the experiments was analyzed with quantum mechanics and solidification theory.

Bewegungen der CH3-Gruppen in Methyl-Naphthalin-Kristallen

1972 ◽  
Vol 27 (1) ◽  
pp. 42-50 ◽  
Author(s):  
J. U. Von Schütz ◽  
H. C. Wolf
Keyword(s):  
Magnetic Field ◽  
Relaxation Time ◽  
Activation Energies ◽  
Rotational Barrier ◽  
Proton Relaxation ◽  
Methyl Groups ◽  
Hindered Rotation ◽  
Proton Relaxation Time ◽  
Methyl Naphthalene ◽  
The Magnetic Field

Abstract The longitudinal proton relaxation time T1 in methyl naphthalene crystals, differing in the arrangement and number of the substituted CH3 groups, was measured as a function of the temperature above 77 °K and the magnetic field between 0.9 and 20 kOe. The results can be described by hindered rotation of the methyl groups with the jumping times and activation energies strongly dependent on the group arrangement. In the β-position the rotational barrier of 0.8 kcal/mol is predominantly determined by the infermolecular interaction, whereas in the case of the a-position and for adjacent CH3’s the hindering potential of 2.4 kcal/mol arises largely from the intramolecular term.

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