Relevant bibliographies by topics / CPMG echoes

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  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'CPMG echoes'

Author: Grafiati
Published: 25 May 2024
Last updated: 31 July 2025

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Journal articles on the topic "CPMG echoes"

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Malone, M. W., and K. L. Sauer. "Homonuclear Dipolar Coupling and CPMG Spin-Echoes in NQR." Applied Magnetic Resonance 43, no. 4 (2012): 541–46. http://dx.doi.org/10.1007/s00723-012-0324-y.

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Oshio, Koichi, and Ferenc A. Jolesz. "Fast MRI by creating multiple spin echoes in a CPMG sequence." Magnetic Resonance in Medicine 30, no. 2 (1993): 251–54. http://dx.doi.org/10.1002/mrm.1910300216.

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Grebenkov, D. S. "Multiexponential attenuation of the CPMG spin echoes due to a geometrical confinement." Journal of Magnetic Resonance 180, no. 1 (2006): 118–26. http://dx.doi.org/10.1016/j.jmr.2006.01.014.

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Dittmer, Jens, and Geoffrey Bodenhausen. "Quenching Echo Modulations in NMR Spectroscopy." ChemPhysChem 7, no. 4 (2006): 831–36. https://doi.org/10.1002/cphc.200500403.

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In NMR spectroscopy, homonuclear scalar couplings normally lead to modulations of spin echoes that tend to interfere with the accurate determination of transverse relaxation rates by Carr–Purcell–Meiboom–Gill (CPMG) multiple refocusing experiments. Surprisingly, the echo modulations are largely cancelled when the refocusing pulses applied to the coupling partner deviate slightly from ideal π rotations due to tilted effective radio-frequency (RF) fields, even at offsets that are much smaller than the radio-frequency amplitude. Experiments and simulations illustrate these effects for two-spin IS
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Zaripov, Ruslan, Evgeniya Vavilova, Iskander Khairuzhdinov, et al. "Tuning the spin coherence time of Cu(II)−(bis)oxamato and Cu(II)−(bis)oxamidato complexes by advanced ESR pulse protocols." Beilstein Journal of Nanotechnology 8 (April 27, 2017): 943–55. http://dx.doi.org/10.3762/bjnano.8.96.

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We have investigated with the pulsed ESR technique at X- and Q-band frequencies the coherence and relaxation of Cu spins S = 1/2 in single crystals of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opba)] (1%) in the host lattice of [n-Bu4N]2[Ni(opba)] (99%, opba = o-phenylenebis(oxamato)) and of diamagnetically diluted mononuclear [n-Bu4N]2[Cu(opbon-Pr2)] (1%) in the host lattice of [n-Bu4N]2[Ni(opbon-Pr2)] (99%, opbon-Pr2 = o-phenylenebis(N(propyl)oxamidato)). For that we have measured the electron spin dephasing time T m at different temperatures with the two-pulse primary echo and with t
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Freed, Denise E., Ulrich M. Scheven, and Martin D. Hürlimann. "Split 180° sequences." Diffusion Fundamentals 10 (December 15, 2009). http://dx.doi.org/10.62721/diffusion-fundamentals.10.439.

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In applications of NMR in inhomogeneous fields, sequences based on the Carr-Purcell-Meiboom-Gill (CPMG) sequence play a central role. The standard CPMG sequence consists of an initial 90° excitation pulse, followed by a long string of 180° refocusing pulses. This creates a series of echoes that decay with characteristic relaxation time T2eff. Here we present a modified sequence, the Split-180° sequence that specifically takes advantage of grossly inhomogeneous fields. In its simplest implementation, the 180° refocusing pulse of the CPMG sequence is split into two separate pulses. This sequence
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Ayalur-Karunakaran, Santhosh, and Siegfried Stapf. "Poly (dimethyl siloxane) films in porous media." Diffusion Fundamentals 10 (December 15, 2009). http://dx.doi.org/10.62721/diffusion-fundamentals.10.436.

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Poly (Dimethyl siloxane) thin films were prepared by solvent evaporation method in porous alumina hosts. The thickness of these layers ranged from multilayer to sub-monolayer. Different NMR methods (FFC relaxometry, transverse relaxation, 1H Double quantum NMR) were applied to study the dynamics and order in these thin films. We found that dynamic restrictions and order increased with decreasing layer size. The increase of a short component of T2 from CPMG curves was attributed to the thawing of the adsorbed chains as seen in the decrease of the short component from Hahn echoes.
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Mao, Kanmi, Jennifer L. Rapp, Jerzy W. Wiench, and Marek Pruski. "Characterization of Nanostructured Organic-Inorganic Hybrid Materials Using Advanced Solid-State NMR Spectroscopy." MRS Proceedings 1184 (2009). http://dx.doi.org/10.1557/proc-1184-hh07-01.

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AbstractWe demonstrate the applications of several novel techniques in solid-state nuclear magnetic resonance spectroscopy (SSNMR) to the structural studies of mesoporous organic-inorganic hybrid catalytic materials. Most of these latest capabilities of solid-state NMR were made possible by combining fast magic angle spinning (at ≥ 40 kHz) with new multiple RF pulse sequences. Remarkable gains in sensitivity have been achieved in heteronuclear correlation (HETCOR) spectroscopy through the detection of high-λ (1H) rather than low-λ (e.g., 13C, 15N) nuclei. This so-called indirect detection tech
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Dissertations / Theses on the topic "CPMG echoes"

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Laurent, Guillaume. "Increasing solid-state NMR sensitivity : instrumentation, fast acquisitions and signal processing." Electronic Thesis or Diss., Sorbonne université, 2020. http://www.theses.fr/2020SORUS183.

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La Résonance Magnétique Nucléaire (RMN) en phase solide souffre d’une faible sensibilité, malgré les récentes améliorations. Les approches instrumentales, d’acquisition rapide et de traitement du signal ont été examinées afin de remédier à ce défaut le plus efficacement possible. Premièrement, les microbobines (bobine en rotation à l’angle magique, MACS) ont été placées dans un rotor et couplées inductivement à la bobine de la sonde standard. Un gain en temps de ~ 5 a été obtenu sur des microquantités avec une masse m ~ 100-200 µg. Deuxièmement, le temps d’acquisition a été diminué grâce aux é
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Whitaker, Chastity Diane Shaffer. "Evaluation of Hahn, CPMG, and combined spin echo analysis at 8 Tesla MRI." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1092788422.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xxvi, 265 p. : ill. (some col.). Advisor: Petra Schmalbrock, Department of Radiology. Includes bibliographical references (p. 244-265).
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Walder, Brennan J. "Separating, correlating, and exploiting anisotropic lineshapes for NMR structure determination in solids." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429846088.

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Tongning, Robert-christopher. "Ralentir le déphasage des états de superposition atomiques dans un cristal de Tm3+ : YAG." Phd thesis, Université Paris Sud - Paris XI, 2014. http://tel.archives-ouvertes.fr/tel-01011160.

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Ce travail se place dans le contexte des recherches sur les mémoires quantiques pour la lumière. L'information quantique est stockée dans un état de superposition atomique, dont la durée de vie détermine le temps maximum de stockage.On s'intéresse particulièrement aux matériaux capables de capturer la lumière par excitation résonnante d'une raie d'absorption, puis de conserver l'information quantique dans un état de superposition du fondamental électronique.Dans Tm3+:YAG, l'information est enregistrée dans un état de spin nucléaire. Cependant le champ magnétique qui lève la dégénérescence nucl
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Bussandri, Mattia Santiago. "Trenes de ecos libres de oscilaciones en RMN de sistemas de espines-1/2 con acoplamiento espín-espín indirecto." Bachelor's thesis, 2017. http://hdl.handle.net/11086/5827.

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Tesis (Lic. en Física)--Universidad Nacional de Córdoba, Facultad de Matemática, Astronomía, Física y Computación, 2017.<br>Las secuencias multipulsos se utilizan a diario desde los comienzos de la Resonancia Magnética Nuclear. Quizás la más popular de las secuencias, conocida como CPMG por las iniciales de sus creadores, produce un tren de ecos de espín utilizada normalmente para refocalizar las inhomogeneidades del campo magnético externo. Aplicado a muestras con espines desacoplados, la secuencia produce un tren de ecos modulados por un decaimiento exponencial, o multiexponencial, dependien
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Book chapters on the topic "CPMG echoes"

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"Fundamentals of Borehole NMR Data Processing and Inversion." In Practical NMR for Oil and Gas Exploration. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/9781782622253-00245.

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Borehole NMR tools usually acquire basic Carr–Purcell–Meiboom–Gill (CPMG) echo trains consisting of several hundred to a few thousand echoes. Echo train data should be converted to a 1D distribution (T1 and T2), 2D distribution (D–T2 and T1–T2) or 3D distribution (T1–D–T2) through Inverse Laplace Transformation (ILT) to further obtain petrophysical parameters and identify the fluid properties of the reservoir. Meanwhile, data compression is normally employed in multidimensional (2D and 3D) NMR inversion procedures to avoid huge memory usage and slow computational speeds. Furthermore, highly re
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"Fundamentals of NMR Physics." In Practical NMR for Oil and Gas Exploration. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/9781782622253-00057.

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The physical principles on which downhole NMR is based are complex. The magnetic resonance phenomena and the pulse sequences, for example, are related to quantum mechanics. NMR logging measurements and NMR log interpretation, however, may be understood with the knowledge of a few basic NMR concepts. These concepts include nuclear magnetism, polarization, T1 relaxation time, T2 relaxation time, pulse tipping, free induction decay, spin echoes, and CPMG and inverse-recovery pulse sequences for one-, two-, and three-dimensional NMR measurements. This chapter is devoted to a discussion of these co
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Conference papers on the topic "CPMG echoes"

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Wang Quanmin, Chen Bin, Guo Gang, and Huang Kedi. "Simulation of UWB echoes from ground based on CPML-FDTD." In 2010 3rd IEEE International Conference on Computer Science and Information Technology (ICCSIT 2010). IEEE, 2010. http://dx.doi.org/10.1109/iccsit.2010.5564658.

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Xie, Z. Harry, Thomas Gentzis, and Humberto Carvajal-Ortiz. "MEASURING KEROGEN, SOLID ORGANICS, AND OIL PRODUCTION POTENTIALS OF UNCONVENTIONAL SOURCE ROCKS USING SOLID TYPE 20-MHZ NMR TECHNIQUES." In 2021 SPWLA 62nd Annual Logging Symposium Online. Society of Petrophysicists and Well Log Analysts, 2021. http://dx.doi.org/10.30632/spwla-2021-0094.

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It is well known that the NMR relaxation time T2 is proportional to the molecular mobility of water or hydrocarbons in rocks. In unconventional tight rocks, water and hydrocarbons are trapped in small pores of nanometer sizes, and their molecular mobility is severely restricted, causing the NMR T2 to be much shorter than that of conventional cases where pore sizes are in micrometer ranges. There are demands for advanced NMR techniques to study those solid-like bound hydrocarbons. In the meantime, it is of great interest for petrophysicists and geochemists to understand kerogen models in order
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Luo, Gang, Sihui Luo, Lizhi Xiao, et al. "NMR Logging Data Processing Using Deep Learning." In 2023 SPWLA 64th Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2023. http://dx.doi.org/10.30632/spwla-2023-0026.

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Nuclear magnetic resonance (NMR) is a powerful tool in biomedical, chemical analysis, the oil industry, and other scientific fields. It provides information on molecular structure for the analysis of molecular dynamics and interactions. In recent years, deep learning (DL) has attracted great interest in various research fields because of the availability of high-performance computing. The employment of DL methods to effectively address shortcomings in NMR data processing is a new research field, such as signal reconstruction, MRI reconstruction, and peak picking of protein spectra. In general,
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Ni, Qingwen, and Shuo Chen. "Assessing the Effect of Matrix Metalloproteinase-9 on the Growth of Mice Teeth." In ASME 2011 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2011. http://dx.doi.org/10.1115/sbc2011-53708.

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Dentin and bone are formed when odontoblasts and osteoblasts synthesize and secrete collagen type I-rich extracellular matrix that mineralizes in a highly controlled manner. A wide spectrum of mouse and human disorders affecting tooth and bone biomineralization shows that dentin and bone formation are under strict genetic control. Although the controlling mechanisms of dentinogenesis and osteogenesis require further study, a large body of evidence points to the importance of the matrix metalloproteinases (MMPs) participate in a wide variety of extracellular matrix degradation. Detailed knowled
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