Bibliografias temáticas / Ultra-Low-Field NMR

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Literatura científica selecionada sobre o tema "Ultra-Low-Field NMR"

Autor: Grafiati

Publicado: 14 de março de 2023

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Artigos de revistas sobre o assunto "Ultra-Low-Field NMR"

Rachineni, Kavitha, Veera Mohana Rao Kakita e Ramakrishna V. Hosur. "Ultra-high resolution in low field tabletop NMR spectrometers". RSC Adv. 7, n.º 77 (2017): 49102–4. http://dx.doi.org/10.1039/c7ra09594e.

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An approach for resolution enhancement is proposed, for data acquired on low field tabletop NMR spectrometers by employing processing-based (generalized indirect covariance) advancements in pure shift NMR.

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Demachi, K., S. Kawagoe, S. Ariyoshi e S. Tanaka. "Ultra-Low Field SQUID-NMR using LN2 Cooled Cu Polarizing Field coil". Journal of Physics: Conference Series 871 (julho de 2017): 012076. http://dx.doi.org/10.1088/1742-6596/871/1/012076.

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Sims, James R., Josef B. Schillig, Charles A. Swenson, David L. Gardner, Andrei N. Matlashov e Curtt N. Ammerman. "Low-Noise Pulsed Pre-Polarization Magnet Systems for Ultra-Low Field NMR". IEEE Transactions on Applied Superconductivity 20, n.º 3 (junho de 2010): 752–55. http://dx.doi.org/10.1109/tasc.2010.2040613.

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George Kurian, K. K., P. K. Madhu e G. Rajalakshmi. "Solid-state NMR signals at zero-to-ultra-low-field". Journal of Magnetic Resonance Open 10-11 (junho de 2022): 100049. http://dx.doi.org/10.1016/j.jmro.2022.100049.

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Jin, Y. R., N. Wang, S. Li, Y. Tian, Y. F. Ren, Y. L. Wu, H. Deng et al. "The Effect of Low Frequency External Field Disturbance on the SQUID Based Ultra-Low Field NMR Measurements". IEEE Transactions on Applied Superconductivity 21, n.º 3 (junho de 2011): 518–21. http://dx.doi.org/10.1109/tasc.2010.2096551.

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Shim, Jeong Hyun, Seong-Joo Lee, Kwon-Kyu Yu, Seong-Min Hwang e Kiwoong Kim. "Strong pulsed excitations using circularly polarized fields for ultra-low field NMR". Journal of Magnetic Resonance 239 (fevereiro de 2014): 87–90. http://dx.doi.org/10.1016/j.jmr.2013.12.007.

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Ganssle, Paul J., Hyun D. Shin, Scott J. Seltzer, Vikram S. Bajaj, Micah P. Ledbetter, Dmitry Budker, Svenja Knappe, John Kitching e Alexander Pines. "Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer". Angewandte Chemie 126, n.º 37 (31 de julho de 2014): 9924–28. http://dx.doi.org/10.1002/ange.201403416.

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Ganssle, Paul J., Hyun D. Shin, Scott J. Seltzer, Vikram S. Bajaj, Micah P. Ledbetter, Dmitry Budker, Svenja Knappe, John Kitching e Alexander Pines. "Ultra-Low-Field NMR Relaxation and Diffusion Measurements Using an Optical Magnetometer". Angewandte Chemie International Edition 53, n.º 37 (31 de julho de 2014): 9766–70. http://dx.doi.org/10.1002/anie.201403416.

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Kiryutin, Alexey S., Ivan V. Zhukov, Fabien Ferrage, Geoffrey Bodenhausen, Alexandra V. Yurkovskaya e Konstantin L. Ivanov. "Sequential assignment of NMR spectra of peptides at natural isotopic abundance with zero- and ultra-low-field total correlation spectroscopy (ZULF-TOCSY)". Physical Chemistry Chemical Physics 23, n.º 16 (2021): 9715–20. http://dx.doi.org/10.1039/d0cp06337a.

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A novel method dubbed ZULF-TOCSY results from the combination of Zero and Ultra-Low Field (ZULF) with high-field, high-resolution NMR, leading to a generalization of the concept of total correlation spectroscopy (TOCSY).

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Tsunaki, S., M. Yamamoto, J. Hatta, Y. Hatsukade e S. Tanaka. "Development of contaminant detection system based on ultra-low field SQUID-NMR/MRI". Journal of Physics: Conference Series 507, n.º 4 (12 de maio de 2014): 042044. http://dx.doi.org/10.1088/1742-6596/507/4/042044.

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Teses / dissertações sobre o assunto "Ultra-Low-Field NMR"

Vigilante, Antonio. "Advances in Atomic Magnetometry for Ultra-Low-Field NMR and MRI". Doctoral thesis, Università di Siena, 2019. http://hdl.handle.net/11365/1087368.

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In this thesis the candidate proposes some technical and fundamental advances for NMR and MRI measurements in the ultra-low field (ULF) regime executed with optical-atomic-magnetometers (OAMs). This regime corresponds to field intensities such to make the nuclei precess at frequencies as low as tens/hundreds Hz. A self-optimized compensation system reduces the magnetic disturbances so to make the magnetometer suited to detect those ULF signals in an unshielded environment. The magnetometer is exploited as a high-sensitivity non-inductive sensor for ULF-NMR signal detection. Besides application in ULF-NMR spectroscopy, the simultaneous analysis of nuclear and atomic precession is used in a novel hybrid setup, which enables the detection of diluted magnetic contaminants. As predominant result an inhomogeneous-magnetic-dressing based (IDEA) technique has been devised enabling the first in-situ ULF-MRI detection by OAMs with sub-millimetric resolution.

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Zampetoulas, Vasileios. "Fast field-cycling NMR relaxometry on biological samples extended to ultra-low magnetic fields". Thesis, University of Aberdeen, 2018. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=237833.

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Laage, Ségolène. "High-resolution solid-state NMR for proteins". Lyon, Ecole normale supérieure, 2010. http://www.theses.fr/2010ENSL0583.

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La RMN a récemment prouvé son potentiel en biologie structurale. Cette thèse décrit les méthodes que nous avons développées pour l’étude de protéines par RMN du solide à haute résolution. Après une présentation des récents progrès du domaine, nous présentons les améliorations liées à l’utilisation de la rotation à l’angle magique à très haute vitesse, notamment les techniques de découplage hétéronucléaire et de polarisation croisée à basse puissance, appliquées aux cas de la Superoxide Dismutase (SOD) et de la protéine GB1. Nous détaillons ensuite les perspectives émergeant dans l’utilisation des couplages J, avec trois nouvelles séquences. La J-CHHC renseigne sur les distances entre protons, le bloc S3E améliore résolution et sensibilité en effectuant du découplage J, et l’INADEQUATE-S3E combine transfert de polarisation par couplage J et découplage J. Nous donnons enfin des perspectives de mesure de longues distances par l’exploitation des propriétés paramagnétiques de la Cu(II) SOD
Solid-state NMR recently proved its potential for structural biology. This thesis details metods we developed for high resolution NMR of nanocrystalline proteins. After an introductory presentation of the recent advances in solid-state NMR of bio-systems, we present the improvements we proposed in the ultra-fast magic-angle spinning regime, notably low-field heteronuclear decoupling and low-field cross-polarization. We demonstrate them with the study of the Superoxide Dismutase (SOD) and the protein GB1. We then focus on the perspectives arising for J-couplings in proteins by presenting three new sequences. The J-CHHC sequence probes 1H-1H distances encoded in 13C-13C correlation experiments. The S3E block improves resolution and sensitivity by performing J-decoupling, and the INADEQUATE-S3E combines J-based transfer of polarization and J-decoupling. We finally give perspectives to probe long-range structural constraints with data exploiting the paramagnetic properties of Cu(II)-SOD

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Capítulos de livros sobre o assunto "Ultra-Low-Field NMR"

Körber, Rainer, Martin Burghoff e Lutz Trahms. "Neuronal Current Imaging with Ultra-Low-Field NMR Techniques". In Magnetoencephalography, 973–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-33045-2_47.

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Austin, Robert, Michelle Espy, Andrei Matlashov, Henrik Sandin, Larry Schultz, Algis Urbaitis e Petr Volegov. "MagViz: A Bottled Liquids Scanner Using Ultra-Low Field NMR Relaxometry". In NATO Science for Peace and Security Series B: Physics and Biophysics, 99–110. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-7265-6_9.

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Kraus, Robert H., Michelle A. Espy, Per E. Magnelind e Petr L. Volegov. "Fundamental Principles of NMR and MRI at ULF". In Ultra-Low Field Nuclear Magnetic Resonance, 1–46. Oxford University Press, 2014. http://dx.doi.org/10.1093/med/9780199796434.003.0001.

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Bevilacqua, G., V. Biancalana, Y. Dancheva e L. Moi. "Optical Atomic Magnetometry for Ultra-Low-Field NMR Detection". In Annual Reports on NMR Spectroscopy, 103–48. Elsevier, 2013. http://dx.doi.org/10.1016/b978-0-12-404716-7.00003-1.

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Trabalhos de conferências sobre o assunto "Ultra-Low-Field NMR"

Belfi, J., G. Bevilacqua, V. Biancalana, S. Cartaleva, Y. Dancheva, K. Khanbekyan e L. Moi. "Application of a differential optical atomic magnetometer to ultra-low field NMR detection". In 11th European Quantum Electronics Conference (CLEO/EQEC). IEEE, 2009. http://dx.doi.org/10.1109/cleoe-eqec.2009.5192128.

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Takeda, Shun, e Hiroshi Kumagai. "Improvement of spin-exchange optical pumping of xenon-129 using in situ NMR measurement in ultra-low magnetic field". In Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues XVI, editado por Daniel L. Farkas, Dan V. Nicolau e Robert C. Leif. SPIE, 2018. http://dx.doi.org/10.1117/12.2288669.

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Yuan, Chengdong, Wanfen Pu, Mikhail A. Varfolomeev, Tao Tan e Shuai Zhao. "Trapped Oil in Low-Permeability Zone Unswept by Water Flooding Under Permeability Heterogeneity Can be Mobilized by Ultra-Low Interfacial Tension: EOR Mechanism of Dilute Surfactant Flooding Proved by Low field NMR Core Flooding and Two-Parallel Core Flooding Experiments". In SPE Gas & Oil Technology Showcase and Conference. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/198638-ms.

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Abbott, William W., Alan Zucconi e A. Aldo Faisal. "Large-field study of ultra low-cost, non-invasive task level BMI". In 2013 6th International IEEE/EMBS Conference on Neural Engineering (NER). IEEE, 2013. http://dx.doi.org/10.1109/ner.2013.6695880.

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Quintanilla, Zach, Rod Russell e Mukul Sharma. "A New Experimental Method for Measuring Improved Oil Recovery in Shales". In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206016-ms.

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Abstract Improved Oil Recovery, IOR, in shales is a topic of growing interest due to the low oil recovery observed in shales. Evaluating different IOR chemicals at the lab scale has proved difficult and time consuming due to their ultra-low permeability and low porosity. Conventional core procedures (such as core floods) are often not practical to use with such samples since they take too long. In this study, we introduce a new laboratory method for measuring the oil recovery in a huff-and-puff IOR process in shales. In huff-and-puff IOR, a treatment additive and a gas are typically injected in combination into the reservoir. Oil production is initiated after a shut-in period. Our experimental protocol starts by saturating preserved shales with oil by exposing them to the reservoir oil under pressure for an extended time. To speed up this process the preserved shale sample is crushed and sieved to 5-10 mesh. The pressure vessels are then loaded with these oil-saturated 5-10 mesh shale particles and the desired IOR fluid is injected into the pressure vessel. The vessel is rotated to ensure full contact with the shale. The samples are heated to ensure that the fluid is at reservoir pressure and temperature. Several tests were done to ensure that the fluid temperature and pressure inside the vessels were at the desired conditions throughout the 72-hour test period. T2 NMR scans were carried out before and after treatment to determine the amount of incremental oil recovery from the treatment. In tests where the two fluid phases were indistinguishable, deuterium was used in the treatment fluid in lieu of water. Excellent reproducible results were obtained with this method. This new method has been used to test a number of different treatment fluids, gases and solvents under a variety of conditions. The test can be completed in a matter of a few days as compared to several weeks that would be required for a core flood. Several tests can be run simultaneously, further speeding up the process. The results of the laboratory tests can be scaled to the field by using suitable surface-to-volume ratios in the lab and comparing them to the field. With this new method we have a fast and robust method for conducting these huff-and-puff experiments in a repeatable, and precise manner. This allows us to quickly evaluate different IOR fluids for a particular shale-fluid system at reservoir conditions.

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Huang, Mingming, Zhedian Zhang, Weiwei Shao, Yan Xiong, Yan Liu, Fulin Lei e Yunhan Xiao. "Comparative Study of Syngas Mild Combustion Characteristics in Swirl Diffusion and Coflow Diffusion Staged Combustor". In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95349.

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MILD combustion is a promising combustion technology for the future gas turbine combustor due to its high combustion efficiency, low exhaust emissions and enhanced combustion stability. It utilizes the concept of exhaust gas recirculation to achieve combustion at reduced temperature and flat thermal field. To examine the role of gas recirculation level on MILD combustion performance, a laboratory-scale axially staged combustor constituted of gas generation zone, mixing zone and MILD combustion zone is presented. To realize ultra-low NOx emissions for syngas characterized by high flame temperature, it is necessary to select an appropriate combustion mode for the gas generation zone. This study compared combustion performance and gas/fuel/air mixing feature between two configurations, gas generation zone of which are based on swirl diffusion combustion and coflow diffusion combustion, respectively. The results are compared on flow field with numerical simulation, and global flame signatures and exhaust emissions with experiment. Both numerical simulation and experiment are performed at equivalence ratio of 0.4, heat load of 24.4 kW, using 10 MJ/Nm3 syngas as the fuel at atmospheric pressure and normal temperature fuel and air. More uniform oxidizer, lower flame temperature and less NOx production are observed in coflow diffusion staged combustion. MILD combustion zone is beneficial for the reduction of NOx and oxidation of CO exit from the gas generation zone.

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Al Hinai, Adnan Saif, Mohamed Fathy Abdelazim, Mohammed H. Al Aamri e Ahmed Mahfoudh Al Wahaibi. "Petro-Phyiscal Evaluation Methods of Complex Clastic Deep Tight Gas Reservoirs to Improve Hydraulic Stimulation Efficiency". In SPE Conference at Oman Petroleum & Energy Show. SPE, 2022. http://dx.doi.org/10.2118/200048-ms.

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Abstract In most cases calstic deep tight gas reservoirs contain considerable hydrocarbon reserves but the ultra-low permeability and the poor inter-connection between the pores may dramatically reduce the recovery for economical gas production. In such cases, hydraulic stimulation techniques can be beneficial to improve the connectivity between the pore spaces and provide a larger conductive channel to allow communication between the reservoir and the well bore. Prior to the fracturing design it is imperative to understand the borehole and the reservoir environment. Hence, the application of petro-physical evaluation. The main objectives of this paper is to discuss the petro-physical evaluation; conventional and advanced methods to understand fracture initiation and propagation behaviors that are essential to plan, design and execute an effective hydraulic fracture treatment program. A large range of wireline logging tools are available today, and several provide sophisticated interpretations of the formation; including details of formation lithology, fluid type, porosity, fluid content and stress regime, etc. In this paper, integrated interpretation has been conducted from both open and cased hole wireline logging. With the aim of assessing the rock mechanics, formation pressures, cement bond, well bore integrity and other reservoir properties to establish a prominent fracturing zone in Barik and Miqrat tight gas reservoirs. Post fracture analysis such as radioactive tracers has been demonstrated, production logging and noise log are studied and linked with the amount of proppant placed in the selected fracturing intervals to assess the stimulation efficiency. Cement bond log evaluations showed good zonal isolation across the 4.5" tubing in the studied wells, notably in Barik and Miqrat reservoirs. However, poor to intermediate cement was observed across the overlap section between 9 5/8" and 4.5". In which was not a stimulation obstacle. Saturation and electrical parameters were derived from Archie's equation and Special Core Analysis (SCAL), respectively. The interpretation revealed that Barik and Middle Miqrat formations are relatively conclusive in some fields and not in others. Mainly due to the high saturation of the trapped gas due to the tightness of the reservoir. Moreover, based on the saturation log analysis, porosity controlled hydrocarbon saturation profile and created a challenge in determining the top of water bearing interval. Non-resistivity based saturation estimates, such as pulsed neutron and dielectric logs did not offer benefit in fluid typing. Well test showed different results as compared with the anticipated water and gas rates. Gas inflow was observed in all tested wells. In addition, some wells not-necessarily located in the extreme flanks of the field, showed high water influx. Irreducible water saturation derived from NMR and/or capillary pressure data helped to identify moveable water in Barik but not in Lower Miqrat formation due to presences of bitumen and vugs. Selective completion strategy for hydraulic stimulation proved to be successful by screening the reservoir intervals thru the use of a combination of petrophysical and cased hole production analysis. Allowing hydraulic fracturing execution to achieve up 90% of the desired proppant placement. Knowledge of in-situ stresses (magnitudes & directions) is critical to understand hydraulic fracture initiation & propagation behaviors. The initiation and propagation behaviors are essential to plan, design and execute an effective hydraulic fracture treatment program. Open hole and cased hole logging are key practices for evaluating fracture behavior. It provides the grounds to optimize for future wells for stimulation.

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Gavrielatos, Ilias, Ram S. Mohan e Ovadia Shoham. "Separation of Oil and Water Emulsions: Is Heating Good Enough?" In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210004-ms.

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Abstract Surfactants and nanoparticles (NP) frequently act as stabilizers for oil and water emulsions. There is a need to investigate whether such NP stabilized emulsions (also known as Pickering emulsions) require different treatment for break-up, as compared to the well-known method to separate surfactant stabilized emulsions, i.e., heating. Thus, the main objectives of this work were to identify emulsions resistant to heating and develop a process able to accelerate the separation kinetics of such ultra-tight emulsions. Extensive experimental investigations on the stability of different types of oil and water emulsions under various temperature and brine salinity conditions were carried out using a state-of-the-art Portable Dispersion Characterization Rig (P-DCR). The batch separator was equipped with a high-resolution, surveillance camera to monitor emulsion separation kinetics. Commercial grade mineral oil and synthesized brines with various salinities were used as the test fluids. Silica nanoparticles of different wettability and surfactants with different HLB values were deployed as the stabilizing agents for the produced emulsions. It was found that the elevated temperature effects dominate the separation kinetics of the studied emulsions, as compared to any brine salinity effects, especially at higher temperatures, namely, 60°C and 80°C. Moreover, the effects of high temperatures and brine salinities on the separation kinetics were much more significant for the emulsions stabilized by surfactants than for NP stabilized emulsions. Perhaps more importantly, neither high temperature nor high brine salinity had any remarkable effects on the separation kinetics of the emulsions stabilized by hydrophobic NP. It was also shown that the hydrophobic NP dominate the stability mechanism for dual emulsifier fluid systems, such as emulsions stabilized by both hydrophobic NP (R974) and a surfactant of low HLB value (Span 80). A novel oil-water emulsion break-up process was developed to enhance the kinetics of the separation, irrespective of the underlying emulsion stability mechanisms, namely, surfactant, NP or both. The performance of this separation process was superior to heating, which is the conventional method applied to separate oil-field emulsions. Finally, it is envisioned that the newly developed process may be applied in the field as an in-line separation system for tight oil-field emulsions.

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