Relevant bibliographies by topics / Transverse relaxation (T2)

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Transverse relaxation (T2)'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Transverse relaxation (T2)"

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Olivieri, Alejandro C. "Illustrating transverse (T2) NMR relaxation with a microcomputer." Concepts in Magnetic Resonance 9, no. 5 (1997): 337–46. http://dx.doi.org/10.1002/(sici)1099-0534(1997)9:5<337::aid-cmr3>3.0.co;2-#.

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Cheng, H. A., R. A. Robergs, J. P. Letellier, A. Caprihan, M. V. Icenogle, and L. J. Haseler. "Changes in muscle proton transverse relaxation times and acidosis during exercise and recovery." Journal of Applied Physiology 79, no. 4 (1995): 1370–78. http://dx.doi.org/10.1152/jappl.1995.79.4.1370.

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We studied changes in muscle proton (1H) transverse relaxation times (T2) by magnetic resonance imaging during exercise and compared these changes with alterations in muscle metabolism measured by phosphorus-31 magnetic resonance spectroscopy (31P-MRS). Eleven subjects completed two trials of intermittent incremental forearm wrist flexion exercise requiring 30 contractions/min for 5 min, 7 min of recovery between stages, and 5-N load increments/stage. Between stages of the first trial, T2 images of muscle 1H were obtained. Muscle T2 increased from 27.3 +/- 1.1 (SD) ms at rest to 35.8 +/- 3.6 m
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Sun, Ximei, Avraam I. Isayev, Tirtha R. Joshi, and Ernst von Meerwall. "Molecular Mobility of Unfilled and Carbon-Black-Filled Isoprene Rubber: Proton NMR Transverse Relaxation and Diffusion." Rubber Chemistry and Technology 80, no. 5 (2007): 854–72. http://dx.doi.org/10.5254/1.3539421.

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Abstract In an effort to understand the effect of ultrasound on the devulcanization of gum and filled isoprene rubber vulcanizates, solid state NMR 1H transverse relaxation (T2) was employed to analyze rubber molecular mobility. The T2 relaxation decay of the unfilled and the black filled IR was successfully described by a two-component model. The short T2 component arose from the chemically crosslinked (gel) and physically entangled (heavy sol) network. The long T2 decay came from the unentangled sol and dangling network chain ends. Vulcanization decreased the molecular mobility; however, ult
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Tei, M., H. Takai, K. Mizoguchi, and K. Kume. "Cu NQR Study on Transverse Relaxation Rate below T c in YBa2Cu3O7." Zeitschrift für Naturforschung A 45, no. 3-4 (1990): 429–32. http://dx.doi.org/10.1515/zna-1990-3-437.

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Abstract The transverse relaxation rate T2-1 was measured in YBa2Cu3O7 from 4.2 to 100 K in zero magnetic field. It showed a sudden drop just below T c down to 1/3 of that above Tc . A cusp-shaped sharp peak of T2-1 was found at 35 K for Cu(2) (plane) site, but not for Cu(l) (chain) site. Except the peak, all the behavior can be interpreted by the model of Pennington et al. that the origin of T2-1 at 100 K is mainly the local field fluctuation by the Cu d-electron and secondly the indirect nuclear spin-spin coupling via superexchange interaction between Cu-ions. Below Tc the former is sup-pres
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Saab, George, R. Terry Thompson, and Greg D. Marsh. "Effects of exercise on muscle transverse relaxation determined by MR imaging and in vivo relaxometry." Journal of Applied Physiology 88, no. 1 (2000): 226–33. http://dx.doi.org/10.1152/jappl.2000.88.1.226.

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The purpose of this study was to determine the effects of intense exercise on the proton transverse (T2) relaxation of human skeletal muscle. The flexor digitorium profundus muscles of 12 male subjects were studied by using magnetic resonance imaging (MRI; 6 echoes, 18-ms echo time) and in vivo magnetic resonance relaxometry (1,000 echoes, 1.2-ms echo time), before and after an intense handgrip exercise. MRI of resting muscle produced a single T2 value of 32 ms that increased by 19% ( P &lt; 0.05) with exercise. In vivo relaxometry showed at least three T2 components (&gt;5 ms) for all subject
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Grashei, Martin, Christian Hundshammer, Frits H. A. van Heijster, Geoffrey J. Topping, and Franz Schilling. "pH Dependence of T2 for Hyperpolarizable 13C-Labelled Small Molecules Enables Spatially Resolved pH Measurement by Magnetic Resonance Imaging." Pharmaceuticals 14, no. 4 (2021): 327. http://dx.doi.org/10.3390/ph14040327.

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Hyperpolarized 13C magnetic resonance imaging often uses spin-echo-based pulse sequences that are sensitive to the transverse relaxation time T2. In this context, local T2-changes might introduce a quantification bias to imaging biomarkers. Here, we investigated the pH dependence of the apparent transverse relaxation time constant (denoted here as T2) of six 13C-labelled molecules. We obtained minimum and maximum T2 values within pH 1–13 at 14.1 T: [1-13C]acetate (T2,min = 2.1 s; T2,max = 27.7 s), [1-13C]alanine (T2,min = 0.6 s; T2,max = 10.6 s), [1,4-13C2]fumarate (T2,min = 3.0 s; T2,max = 18
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Ronczka, M., and M. Müller-Petke. "Optimization of CPMG sequences to measure NMR transverse relaxation time <i>T</i><sub>2</sub> in borehole applications." Geoscientific Instrumentation, Methods and Data Systems 1, no. 2 (2012): 197–208. http://dx.doi.org/10.5194/gi-1-197-2012.

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Abstract. Nuclear Magnetic Resonance (NMR) can provide key information such as porosity and permeability for hydrological characterization of geological material. In particular the NMR transverse relaxation time T2 is used to estimate permeability since it reflects a pore-size dependent relaxation process. The measurement sequence (CPMG) usually consists of several thousands of electromagnetic pulses to densely record the relaxation process and to avoid relaxation processes that are due to diffusion. These pulses are equidistantly spaced by a time constant tE. In NMR borehole applications the
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Patibandla, Sridhar, Bhargava Kanchibotla, Sandipan Pramanik, Supriyo Bandyopadhyay, and Marc Cahay. "Spin Relaxation Mechanisms in the Organic Semiconductor Alq3." International Journal of Nanotechnology and Molecular Computation 1, no. 4 (2009): 20–38. http://dx.doi.org/10.4018/jnmc.2009120902.

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We have measured the longitudinal (T1) and transverse (T2) spin relaxation times in the organic semiconductor tris(8-hydroxyquinolinolato aluminum)—also known as Alq3—at different temperatures. These measurements shed some light on the spin relaxation mechanisms in the organic. The two most likely mechanisms affecting T1 are hyperfine interactions between carrier and nuclear spins, and the Elliott-Yafet mode. On the other hand, the dominant mechanism affecting T2 of delocalized electrons in Alq3 remains uncertain, but for localized electrons (bound to defect or impurity sites), the dominant me
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Lin, Xiaoqing, Haolin Zhan, Hong Li, Yuqing Huang, and Zhong Chen. "NMR Relaxation Measurements on Complex Samples Based on Real-Time Pure Shift Techniques." Molecules 25, no. 3 (2020): 473. http://dx.doi.org/10.3390/molecules25030473.

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Longitudinal spin-lattice relaxation (T1) and transverse spin-spin relaxation (T2) reveal valuable information for studying molecular dynamics in NMR applications. Accurate relaxation measurements from conventional 1D proton spectra are generally subject to challenges of spectral congestion caused by J coupling splittings and spectral line broadenings due to magnetic field inhomogeneity. Here, we present an NMR relaxation method based on real-time pure shift techniques to overcome these two challenges and achieve accurate measurements of T1 and T2 relaxation times from complex samples that con
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Ronczka, M., and M. Müller-Petke. "Optimization of CPMG sequences for NMR borehole measurements." Geoscientific Instrumentation, Methods and Data Systems Discussions 2, no. 2 (2012): 507–38. http://dx.doi.org/10.5194/gid-2-507-2012.

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Abstract. Nuklear Magnetic Resonance (NMR) can provide key information such as porosity and permeability for hydrological characterization of geological material. Especially the NMR transverse relaxation time T2 is used to estimate permeability since it reflects a pore-size dependent relaxation process. The measurement sequence (CPMG) usually used consists of several thousands of electromagnetic pulses to densely record the relaxation process. These pulses are equidistantly spaced by a time constant τ. In NMR borehole applications the use of CPMG sequences for measuring the transverse relaxati
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Dissertations / Theses on the topic "Transverse relaxation (T2)"

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Winisdorffer, Guillaume. "Caractérisation de la microstructure spatiale de la pomme en lien avec ses propriétés mécaniques par des méthodes quantitatives d'IRM." Nantes, 2014. http://archive.bu.univ-nantes.fr/pollux/show.action?id=de877516-31c3-4c88-8773-b1d421c58ea2.

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Les propriétés mécaniques du péricarpe de la pomme dépendent d'une multitude de facteurs. Sont impliqués la matière sèche, répartie entre fraction insoluble (parois) et fraction soluble, l'état de l'eau et sa répartition au sein de la cellule, la fraction d'air entre les cellules, et leur taille et organisation. L'état de l'eau et sa répartition n'ont été que peu étudiés et l'IRM quantitative est un outil de choix pour réaliser ces mesures de façon non-destructive. Nous avons de façon originale exploité le signal IRM multi-exponentiel de relaxation du fruit pour en extraire le signal de différ
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Sorin, Clément. "Subcellular modification and nutrient remobilization during Brassica napus leaf senescence : effects of abiotic stresses." Thesis, Rennes 1, 2014. http://www.theses.fr/2014REN1S145/document.

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Brassica napus est une des cultures oléagineuse majeure dans le monde. En raison de sa faible efficacité d’utilisation de l’azote (NUE) comparée aux autres grandes cultures, la gestion de cette ressource présente un objectif écologique et économique majeur pour cette culture. La remobilisation des nutriments des organes sources vers les organes puits est une composante de la NUE qui se déroule durant la sénescence et qui est associée aux processus de recyclages métaboliques et à des modifications de la structure foliaire. L’objectif de cette thèse était de comprendre et de quantifier ces modif
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Conference papers on the topic "Transverse relaxation (T2)"

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Alam, M. M., K. Katika, and I. L. Fabricius. "Wettability of Quartz Surface As Observed By NMR Transverse Relaxation Time (T2)." In 75th EAGE Conference and Exhibition incorporating SPE EUROPEC 2013. EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20130794.

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Hursan, Gabor, Wei Shao, Ron Balliet, and Yasir Farooq. "Eliminating Diffusion Effects from NMR Logging Data for Enhanced Carbonate Pore Typing." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206233-ms.

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Abstract Transverse relaxation (T2) times measured by multi-frequency, multi-gradient nuclear magnetic resonance (NMR) logging tools are affected by diffusion-induced enhanced relaxation which reduces the sensitivity to pore size in slow-relaxing formations such as macroporous carbonates and complicates the integration with zero-gradient core NMR data. We propose a solution for eliminating the diffusion-related uncertainties using intrinsic T2 distributions, obtained by a new inversion-forward modeling-inversion (IFMI) method, for carbonate pore typing applications. The NMR logs presented in t
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Alam, M. Monzurul, Konstantina Katika, and Ida Lykke Fabricius. "Effect of dissolved ions on bound water on water wet mineral surfaces as indicated by NMR transverse relaxation time (T2)." In SEG Technical Program Expanded Abstracts 2013. Society of Exploration Geophysicists, 2013. http://dx.doi.org/10.1190/segam2013-1357.1.

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Gu, Yunfeng, Zhonghua Ni, Minhua Chen, Kedong Bi, and Yunfei Chen. "The Phonon Thermal Conductivity of a Single-Layer Graphene From Complete Phonon Dispersion Relations." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39645.

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In this paper, the phonon scattering mechanisms of a single layer graphene are investigated based on the complete phonon dispersion relations. According to the selection rules that a phonon scattering process should obey the energy and momentum conservation conditions, the relaxation rates of combing and splitting Umklapp processes can be calculated by integrating the intersection lines between different phonon mode surfaces in the phonon dispersion relation space. The dependence of the relaxation rates on the wave vector directions is presented with a three dimensional surfaces over the first
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Ji, Yunkai, Jian Hou, Yongge Liu, and Qingjun Du. "Study on Formation and Dissociation of Methane Hydrate in Sandstone Using Low-Field Nuclear Magnetic Resonance Technology." In ASME 2020 39th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/omae2020-19316.

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Abstract Natural gas hydrate, as an unconventional resource, has been attracting increasing attention. Understanding the characteristics of methane hydrate formation and dissociation in porous media is important for developing gas hydrate-bearing reservoirs. This work discusses the use of low-field nuclear magnetic resonance (LF-NMR) technology to investigate the formation and dissociation of methane hydrate in the sandstone. In this work, an experimental assembly wherein methane hydrate can form and dissociate, is used to conduct LF-NMR measurements. LF-NMR, as a noninvasive measurement techn
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