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Relevant bibliographies by topics / Transverse and Longitudinal Relaxation Methods

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Journal articles

Academic literature on the topic 'Transverse and Longitudinal Relaxation Methods'

Author: Grafiati

Published: 6 September 2023

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Journal articles on the topic "Transverse and Longitudinal Relaxation Methods"

1

TODICA, M. "NMR OBSERVATION OF THE SPIN-LATTICE AND SPIN-SPIN RELAXATION IN SOME POLIBUTADIENES WITH DIFFERENT VINYL CONTENTS." International Journal of Modern Physics B 19, no. 13 (2005): 2167–74. http://dx.doi.org/10.1142/s0217979205029705.

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Some polybutadienes with different vinyl contents were observed by NMR methods in order to disclose the influence of the microstructure of the polymeric chains on the relaxation of the longitudinal and transverse magnetization. The relaxation process is correlated with the dynamic properties of the polymeric chains. The residual dipolar interaction determined by the rigidity of the polymeric chains is observed by the pseudo-solid echo method and is associated with the vinyl contents of the samples.

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2

Chance, Brent H., and Don E. Bray. "Nondestructive Monitoring of Stress Relaxation in Welded Steel Plates." Journal of Pressure Vessel Technology 124, no. 3 (2002): 343–48. http://dx.doi.org/10.1115/1.1491581.

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This study investigates transverse stress relaxation in welded steel plates. Two different methods of stress measurement were used; strain gages and critically refracted longitudinal LCR waves. The material investigated was ASTM 1008/1010 steel. T-shaped slots were cut from each edge of each specimen in order to provide a uniaxial tension stress field in the area of investigation. After the plates were stress-relieved by annealing, the transverse slots were then welded and allowed to cool. Strain gages were applied to the bridge area joining the middle of the plate and oriented parallel to the

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3

Wei, Mengmeng, Wenbin Yu, Min Zhou, Wei Huang, Yuanxing Liu, and Xinye Xu. "Three techniques for measuring the transverse relaxation time of cesium atoms." AIP Advances 13, no. 3 (2023): 035327. http://dx.doi.org/10.1063/5.0140593.

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The transverse relaxation time ( T2) is an important indicator to determine the fundamental sensitivity limit of alkali-metal atomic magnetometers. We propose a method based on the principle of longitudinal field modulation that obtains T2 by scanning the transverse static magnetic field. The previous technique of extracting T2 from the linewidth of the modulation frequency and the traditional magnetic-resonance-broadening-fitting method are also described. The T2 measurements of Cesium (Cs) atoms are carried out through these three methods, whose operating environments are applicable to diffe

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4

Monaretto, Tatiana, Tiago Bueno Moraes, and Luiz Alberto Colnago. "Recent 1D and 2D TD–NMR Pulse Sequences for Plant Science." Plants 10, no. 5 (2021): 833. http://dx.doi.org/10.3390/plants10050833.

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Time domain nuclear magnetic resonance (TD–NMR) has been widely applied in plant science in the last four decades. Several TD–NMR instruments and methods have been developed for laboratory, green-house, and field studies. This mini-review focuses on the recent TD–NMR pulse sequences applied in plant science. One of the sequences measures the transverse relaxation time (T2) with minimal sample heating, using a lower refocusing flip angle and consequently lower specific absorption rate than that of conventional CPMG. Other sequences are based on a continuous wave free precession (CWFP) regime us

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5

TODICA, M. "COMPARATIVE OBSERVATION OF THE NMR SPIN-LATTICE AND SPIN-SPIN RELAXATION IN MOLTEN AND CROSS-LINKED POLIBUTADIENE." International Journal of Modern Physics B 19, no. 10 (2005): 1771–81. http://dx.doi.org/10.1142/s0217979205029353.

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The molten and cross-linked polybutadiene were observed by NMR methods in order to disclose the influence of the presence of the temporary and permanent junctions between the polymeric chains on the relaxation of the longitudinal and transverse magnetization. The residual dipolar interaction determined by the entanglements of the polymeric chains is observed by the pseudo-solid echo method and is associated with the existence of the temporary network.

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6

Chen, Jianfei, Jingyu Chu, Wenchun Jiang, et al. "Experimental and Numerical Simulation to Study the Reduction of Welding Residual Stress by Ultrasonic Impact Treatment." Materials 13, no. 4 (2020): 837. http://dx.doi.org/10.3390/ma13040837.

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In this study, the effects of ultrasonic impact treatment (UIT) on the residual stress in a repair welding joint are investigated by experimental and finite element methods. A three-dimensional numerical analysis approach including a thermomechanical-coupled welding simulation and dynamic elastic-plastic UIT simulation is developed, which has been validated by X-ray diffraction measurement and indentation strain method. The results show that longitudinal residual stresses basically turned into the small tensile stress state from the large tensile stress state, and transverse residual stresses

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7

Haribabu, Viswanathan, Palani Sharmiladevi, Najim Akhtar, Abubacker Sulaiman Farook, Koyeli Girigoswami, and Agnishwar Girigoswami. "Label Free Ultrasmall Fluoromagnetic Ferrite-clusters for Targeted Cancer Imaging and Drug Delivery." Current Drug Delivery 16, no. 3 (2019): 233–41. http://dx.doi.org/10.2174/1567201816666181119112410.

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Objective: The label free ultrasmall fluorescent ferrite clusters have been engineered in a controlled fashion which was stabilized by serum protein and functionalized by folic acid for the application of targeted multimodal optical and Magnetic Resonance (MR) cancer imaging. Methods: The ultra-small manganese ferrite nanoclusters (PMNCs) with a diameter of 4 nm have a commendable effect on the longitudinal (T1) and transverse (T2) relaxation in MR imaging that was evident from the phantom and animal MRI. Results: The calculated longitudinal molar relaxivity of nanoclusters was found to be 6.9

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8

Uddin, Md Nasir, R. Marc Lebel, Peter Seres, Gregg Blevins, and Alan H. Wilman. "Spin echo transverse relaxation and atrophy in multiple sclerosis deep gray matter: A two-year longitudinal study." Multiple Sclerosis Journal 22, no. 9 (2016): 1133–43. http://dx.doi.org/10.1177/1352458515614091.

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Background: Deep gray matter (DGM) is affected in relapsing–remitting multiple sclerosis (RRMS) and may be studied using short-term longitudinal MRI. Objective: To investigate two-year changes in spin-echo transverse relaxation rate (R2) and atrophy in DGM, and its relationship with disease severity in RRMS patients. Methods: Twenty six RRMS patients and 26 matched controls were imaged at 4.7 T. Multiecho spin-echo R2 maps and atrophy measurements were obtained in DGM at baseline and two-year follow-up. Differences between MRI measures and correlations to disease severity were examined. Result

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9

Zhang, Yapeng, Jingjing Cheng, and Wenzhong Liu. "Characterization and Relaxation Properties of a Series of Monodispersed Magnetic Nanoparticles." Sensors 19, no. 15 (2019): 3396. http://dx.doi.org/10.3390/s19153396.

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Magnetic iron oxide nanoparticles are relatively advanced nanomaterials, and are widely used in biology, physics and medicine, especially as contrast agents for magnetic resonance imaging. Characterization of the properties of magnetic nanoparticles plays an important role in the application of magnetic particles. As a contrast agent, the relaxation rate directly affects image enhancement. We characterized a series of monodispersed magnetic nanoparticles using different methods and measured their relaxation rates using a 0.47 T low-field Nuclear Magnetic Resonance instrument. Generally speakin

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10

Wernersson, Sven, Göran Carlström, Andreas Jakobsson та Mikael Akke. "Rapid measurement of heteronuclear transverse relaxation rates using non-uniformly sampled <i>R</i><sub>1<i>ρ</i></sub> accordion experiments". Magnetic Resonance 2, № 2 (2021): 571–87. http://dx.doi.org/10.5194/mr-2-571-2021.

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Abstract. Multidimensional, heteronuclear NMR relaxation methods are used extensively to characterize the dynamics of biological macromolecules. Acquisition of relaxation datasets on proteins typically requires significant measurement time, often several days. Accordion spectroscopy offers a powerful means to shorten relaxation rate measurements by encoding the “relaxation dimension” into the indirect evolution period in multidimensional experiments. Time savings can also be achieved by non-uniform sampling (NUS) of multidimensional NMR data, which is used increasingly to improve spectral reso

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