Influence of internal motion on the carbon-13 relaxation times of methyl carbons

1972 ◽  
Vol 76 (22) ◽  
pp. 3213-3216 ◽  
Author(s):  
James R. Lyerla ◽  
David M. Grant
Keyword(s):  
Relaxation Times ◽  
Internal Motion

An emerging technology: Nuclear magnetic resonance microscopy

1988 ◽  
Vol 46 ◽  
pp. 1000-1001
Author(s):  
M.J. Hennessy ◽  
E. Kwok
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Relaxation Times ◽  
Basic Research ◽  
Local Environment ◽  
Magnetic Resonance Images ◽  
Nmr Microscopy ◽  
Mri Scans ◽  
Temperature Relaxation ◽  
Nuclear Magnetic

Much progress in nuclear magnetic resonance microscope has been made in the last few years as a result of improved instrumentation and techniques being made available through basic research in magnetic resonance imaging (MRI) technologies for medicine. Nuclear magnetic resonance (NMR) was first observed in the hydrogen nucleus in water by Bloch, Purcell and Pound over 40 years ago. Today, in medicine, virtually all commercial MRI scans are made of water bound in tissue. This is also true for NMR microscopy, which has focussed mainly on biological applications. The reason water is the favored molecule for NMR is because water is,the most abundant molecule in biology. It is also the most NMR sensitive having the largest nuclear magnetic moment and having reasonable room temperature relaxation times (from 10 ms to 3 sec). The contrast seen in magnetic resonance images is due mostly to distribution of water relaxation times in sample which are extremely sensitive to the local environment.

On relaxation times

1999 ◽  
Vol 169 (10) ◽  
pp. 1163
Author(s):  
V.L. Vaks ◽  
V.V. Mityugov
Keyword(s):  
Relaxation Times

Dielectric Relaxation Studies of Silver Nanoparticles dispersed Liquid Crystal

2015 ◽  
Vol 8 (3) ◽  
pp. 2176-2188 ◽  
Author(s):  
Keisham Nanao Singh
Keyword(s):  
Activation Energy ◽  
Silver Nanoparticles ◽  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Relaxation Process ◽  
Relaxation Times ◽  
Low Frequency ◽  
Bulk Liquid ◽  
Molecular Rearrangement ◽  
Relaxation Studies

This article reports on the Dielectric Relaxation Studies of two Liquid Crystalline compounds - 7O.4 and 7O.6 - doped with dodecanethiol capped Silver Nanoparticles. The liquid crystal molecules are aligned homeotropically using CTAB. The low frequency relaxation process occurring above 1 MHz is fitted to Cole-Cole formula using the software Dielectric Spectra fit. The effect of the Silver Nanoparticles on the molecular dipole dynamics are discussed in terms of the fitted relaxation times, Cole-Cole distribution parameter and activation energy. The study indicate a local molecular rearrangement of the liquid crystal molecules without affecting the order of the bulk liquid crystal molecules but these local molecules surrounding the Silver Nanoparticles do not contribute to the relaxation process in the studied frequency range. The observed effect on activation energy suggests a change in interaction between the nanoparticles/liquid crystal molecules.

Relaxation times of normal breast tissues

1994 ◽  
Vol 35 (3) ◽  
pp. 258-261 ◽  
Author(s):  
Kirsti Dean ◽  
M. -L. Majurin ◽  
M. Komu
Keyword(s):  
Relaxation Times ◽  
Normal Breast ◽  
Breast Tissues

Apparitions and Atmosphères (1958–61)

2017 ◽  
Author(s):  
Benjamin R. Levy
Keyword(s):  
Electronic Music ◽  
Internal Motion ◽  
Orchestral Works ◽  
Compositional Technique

This chapter examines Ligeti’s breakthrough orchestral works Apparitions and Atmosphères. These successful compositions translate some of the ideas developed in the electronic music studio into orchestral writing, in particular, techniques for organizing rhythm and for handling sound masses to create a static surface with a sense of internal motion. In interviews Ligeti claimed to have attempted to move in this direction while still in Hungary with the unfinished pieces Víziók and Sötét és Világos. A comparison of the extant sketches for these works shows the degree to which his experiences in the electronic studio resulted in a refinement of compositional technique, nuanced textures, and original orchestration.

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