Готові списки джерел за темами / Field Cycling NMR

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Добірка наукової літератури з теми "Field Cycling NMR"

Автор: Grafiati

Опубліковано: 5 березня 2024

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Статті в журналах з теми "Field Cycling NMR"

Kimmich, Rainer, and Esteban Anoardo. "Field-cycling NMR relaxometry." Progress in Nuclear Magnetic Resonance Spectroscopy 44, no. 3-4 (July 2004): 257–320. http://dx.doi.org/10.1016/j.pnmrs.2004.03.002.

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Kresse, B., A. F. Privalov, and F. Fujara. "NMR field-cycling at ultralow magnetic fields." Solid State Nuclear Magnetic Resonance 40, no. 4 (November 2011): 134–37. http://dx.doi.org/10.1016/j.ssnmr.2011.10.002.

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Blanz, M., T. J. Rayner, and J. A. S. Smith. "A fast field-cycling NMR/NQR spectrometer." Measurement Science and Technology 4, no. 1 (January 1, 1993): 48–59. http://dx.doi.org/10.1088/0957-0233/4/1/009.

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Anoardo, E., G. Galli, and G. Ferrante. "Fast-field-cycling NMR: Applications and instrumentation." Applied Magnetic Resonance 20, no. 3 (April 2001): 365–404. http://dx.doi.org/10.1007/bf03162287.

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Miesel, K., K. L. Ivanov, A. V. Yurkovskaya, and H. M. Vieth. "Coherence transfer during field-cycling NMR experiments." Chemical Physics Letters 425, no. 1-3 (July 2006): 71–76. http://dx.doi.org/10.1016/j.cplett.2006.05.025.

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Schauer, G., W. Nusser, M. Blanz, and R. Kimmich. "NMR field cycling with a superconducting magnet." Journal of Physics E: Scientific Instruments 20, no. 1 (January 1987): 43–46. http://dx.doi.org/10.1088/0022-3735/20/1/007.

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Pine, Kerrin J., Gareth R. Davies, and David J. Lurie. "Field-cycling NMR relaxometry with spatial selection." Magnetic Resonance in Medicine 63, no. 6 (April 23, 2010): 1698–702. http://dx.doi.org/10.1002/mrm.22346.

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NOACK, F., ST BECKER, and J. STRUPPE. "ChemInform Abstract: Applications of Field-Cycling NMR." ChemInform 28, no. 44 (August 3, 2010): no. http://dx.doi.org/10.1002/chin.199744350.

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Bielecki, A., D. B. Zax, A. M. Thayer, J. M. Millar, and A. Pines. "Time Domain Zero Field NMR and NQR." Zeitschrift für Naturforschung A 41, no. 1-2 (February 1, 1986): 440–44. http://dx.doi.org/10.1515/zna-1986-1-286.

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Анотація:

Field cycling methods are described for the time domain measurement of nuclear quadrupolar and dipolar spectra in zero applied field. Since these techniques do not involve irradiation in zero field, they offer significant advantages in terms of resolution, sensitivity at low frequency, and the accessible range of spin lattice relaxation times. Sample data are shown which illustrate the high sensitivity and resolution attainable. Comparison is made to other field cycling methods, and an outline of basic instrumental requirements is given.

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Zhukov, Ivan V., Alexey S. Kiryutin, Alexandra V. Yurkovskaya, Yuri A. Grishin, Hans-Martin Vieth, and Konstantin L. Ivanov. "Field-cycling NMR experiments in an ultra-wide magnetic field range: relaxation and coherent polarization transfer." Physical Chemistry Chemical Physics 20, no. 18 (2018): 12396–405. http://dx.doi.org/10.1039/c7cp08529j.

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Дисертації з теми "Field Cycling NMR"

Pine, Kerrin J. "Localized fast field-cycling NMR relaxometry." Thesis, University of Aberdeen, 2014. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=215228.

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Conventional MRI relies on a strong fixed magnetic field B0 which is stable during the imaging process. By contrast, field-cycling MRI switches the strength of B0 up or down during an experiment. In this way, field-cycling provides access to endogenous information not accessible to standard MRI, such as enhanced T1 relaxation at certain NMR frequencies due to interactions between hydrogen and nitrogen nuclei in proteins. However, biomedical research of T1 dispersion is limited by the unavailability of equipment and rapid software methods. Strategies are presented to address these deficiencies. A removable electromagnet was designed and implemented for use with a 59-mT vertical-field, permanent-magnet based imager. The resistive magnet locally offsets the primary field over a small projected region to enable field-cycling relaxometry on an otherwise-conventional imager. Radiofrequency coils were constructed to suit the electromagnet’s configuration. T1 dispersion measurements were demonstrated for, separately, the finger joints and forearm of a human volunteer. Prior to this work, producing graphs of T1 dispersion from a volume of interest required lengthy T1 mapping at each field strength step. A new pulse sequence combining SR/IR T1 determination with field-cycling and point-resolved spectroscopy localization enables the measurement of dispersion curves of a volume selected from a pilot image. Its advantages include less partial voluming than whole-sample relaxometry, as well as better SNR and faster acquisition times than image-based techniques. The sequence’s sensitivity is sufficient to reveal distinctive ‘quadrupole dips’ in dispersion curves. To the author’s knowledge, it is the first pulse sequence to enable the relationship between T1 and field strength to be examined in times which are feasible for clinical investigations. Used together as presented in this thesis, the hardware and software developed represent a step towards field-cycling being used to reveal useful diagnostic information inaccessible to conventional MRI.

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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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Miesel, Karsten [Verfasser]. "Field cycling NMR experiments with hyperpolarized multi-spin-systems / Karsten Miesel." Berlin : Freie Universität Berlin, 2008. http://d-nb.info/1023401371/34.

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Wu, Weimin. "Field-cycling NMR investigations of nuclear spin relaxation and proton tunnelling." Thesis, University of Nottingham, 2006. http://eprints.nottingham.ac.uk/10155/.

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A current-switched superconducting field-cycling NMR spectrometer has been designed and built for studying the role of quantum tunnelling in molecular dynamics. The instrument is designed for work in the solid state with sample temperatures extending from 4K up to 300K. The maximum field-switching rate is 10Ts-1. Among the samples studied in this thesis is the nuclear spin-relaxation and proton tunnelling. Concerted double proton transfer in the hydrogen bonds of carboxylic acid dimers is well established as the model system for translational quantum tunnelling. The model system has been chosen to illustrate the smooth quantum-to-classical transition and at all temperatures the proton transfer is characterised by a single correlation time. Quadrupolar interactions introduce an additional relaxation to the proton spin polarisation. The enhanced relaxation of the proton spin appears as a dip in the proton magnetisation curve. This technique is employed to measure the quadrupolar transition frequency of 14N and 35Cl and determine the structure of heroin hydrochloride. The introduction of a second spin species has a significant effect on the spin-lattice relaxation. Compared with homonuclear systems, the spectral density acquires additional components characterised by the sum and difference Larmor frequencies of the two nuclei. Further, instead of a single relaxation time, there are four elements of a relaxation matrix. Therefore, the magnetisation recovery becomes bi-exponential and the initial polarisation state of the second nucleus strongly affects the magnetisation recovery of the nucleus which is being observed. We shall report on the results of spin-lattice relaxation investigations on 1H-13C, 1H-19F systems. The role of heteronuclear interactions in spin-lattice relaxation and the newly developed methodology of field-cycling relaxometry will be discussed. This represents the first 13C field-cycling NMR experiment and the first to measure the field dependence of the off-diagonal element of the relaxation matrix.

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Noble, Daniel Leigh. "Field-cycling NMR investigations of proton tunnelling and nuclear spin relaxation." Thesis, University of Nottingham, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.438354.

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Freiman, Gabriel, Jean-Pierre Korb, Benjamin Nicot, and Patrice Ligneul. "Microscopic wettability of carbonate rocks: a proton field cycling NMR approach." Diffusion fundamentals 10 (2009) 25, S. 1-3, 2009. https://ul.qucosa.de/id/qucosa%3A14116.

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Nuclear Magnetic Relaxation Dispersion (NMRD) is strongly sensitive to the microscopic wettability of oil and brine bearing carbonate rocks. Exploring a very large range of low frequency enables isolating the typical NMRD dispersion features, 1/T1Surf, associated to the different processes of molecular surface dynamics. This allows a separation of the surface and bulk microdynamics of oil and water even for a biphasic saturation of petroleum rocks. Several surface dynamical parameters were determined and related to the concept of microscopic wettability of oil and water in porous media.

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Sun, Cheng. "Quantum dynamics and tunnelling of methyl rotors studied by field-cycling NMR." Thesis, University of Nottingham, 2009. http://eprints.nottingham.ac.uk/10751/.

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Quantum dynamics and tunnelling of methyl rotors has been studied using field-cycling nuclear magnetic resonance (NMR) spectrometer, in a variety of samples. The characteristic frequency of the tunnelling motion of methyl groups has been investigated using both low-field dipole-dipole driven experiments and tunnel resonance level-crossing experiments. The classical hopping and quantum tunnelling of methyl groups have been studied by making temperature-dependent and field-dependent measurements of the spin-lattice relaxation time T1. The spectral density functions of the dipolar interaction, mediated by the rotation of methyl groups, have been directly plotted, and the correlation times characteristic of the rotational motion have been determined. Electron spin resonance (ESR) tunnel resonance spectra have been studied in samples with unpaired electrons by making resonant contact between the methyl tunnelling reservoir and the electron spins. The phenomenon of dynamic proton polarisation (DNP) has also been investigated in these samples. Experiments demonstrating the cooling of methyl tunnelling reservoir and the diffusion of energy amongst tunnelling reservoirs are presented. In low-field dipole-dipole driven experiments, in order to avoid the tunnelling transition saturation problem, the sideband stirring radiofrequency (rf) irradiation technique has been utilised and the low-field NMR spectra have been observed with enhanced sideband peaks. The rf irradiation time-dependence of the low-field spectra has been investigated. The experimental data is supported by numerical simulations, using appropriate theoretical models.

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McGloin, C. J. "Hydrogen bond dynamics : an investigation using NMR field-cycling and QENS techniques." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298074.

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Volgmann, K., B. Kresse, A. F. Privalov, F. Fujara, and P. Heitjans. "7Li Field-Cycling NMR as Powerful Tool for Investigating Li Ion Conductors." Diffusion fundamentals 21 (2014) 25, S.1, 2014. https://ul.qucosa.de/id/qucosa%3A32435.

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Hofmann, Marius [Verfasser], and Ernst [Akademischer Betreuer] RößLer. "Field-Cycling NMR as a Tool of Molecular Rheology / Marius Hofmann ; Betreuer: Ernst Rößler." Bayreuth : Universität Bayreuth, 2016. http://d-nb.info/1116426382/34.

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Книги з теми "Field Cycling NMR"

Kimmich, Rainer, ed. Field-cycling NMR Relaxometry. Cambridge: Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/9781788012966.

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Canet, Daniel, David Lurie, Siegfried Stapf, Hans-Martin Vieth, and Duarte de Mesquita e Sousa. Field-Cycling NMR Relaxometry: Instrumentation, Model Theories and Applications. Royal Society of Chemistry, The, 2018.

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Частини книг з теми "Field Cycling NMR"

Kimmich, Rainer. "Field-Cycling NMR Relaxometry." In NMR, 138–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60582-6_15.

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Kimmich, Rainer. "Field-Cycling Relaxometry in Biosystems." In NMR, 149–58. Berlin, Heidelberg: Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/978-3-642-60582-6_16.

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Bengs, C. "Chapter 5. Manipulation of Singlet Order by Field-cycling." In New Developments in NMR, 113–27. Cambridge: Royal Society of Chemistry, 2020. http://dx.doi.org/10.1039/9781788019972-00113.

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Redfield, Alfred G. "Field-Cycling NMR Applied to Macromolecular Structure and Dynamics." In NMR as a Structural Tool for Macromolecules, 123–32. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4613-0387-9_10.

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Hofmann, M., M. Flämig, and E. A. Rössler. "Chapter 6. Dynamics of Polymer Systems Studied by NMR Field-cycling Relaxometry." In NMR Methods for Characterization of Synthetic and Natural Polymers, 101–29. Cambridge: Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/9781788016483-00101.

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Noack, F., and K. H. Schweikert. "Nuclear Spin Relaxation Mechanisms in Liquid Crystals Studied by Field Cycling NMR." In The Molecular Dynamics of Liquid Crystals, 233–55. Dordrecht: Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1168-3_10.

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Becker, St, K. H. Schweikert, and F. Noack. "Design and Construction of a 2.4 T Air-Cored Copper Magnet for Fast Field-Cycling NMR." In 25th Congress Ampere on Magnetic Resonance and Related Phenomena, 458–59. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-76072-3_238.

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Hore, P. J., J. A. Jones, and S. Wimperis. "Phase cycling and pulsed field gradients." In NMR: THE TOOLKIT. Oxford University Press, 2015. http://dx.doi.org/10.1093/hesc/9780198703426.003.0006.

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Introduction We have already encountered the concept of phase cycling: NMR experiments can be repeated several times with different pulse phases and the resulting signals added and subtracted in such a way as to cancel any unwanted contributions. For example, a two-step cycle...

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Noack, F., St Becker, and J. Struppe. "Applications of Field-Cycling NMR." In Annual Reports on NMR Spectroscopy, 1–36. Elsevier, 1996. http://dx.doi.org/10.1016/s0066-4103(08)60047-2.

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Conte, Pellegrino. "Applications of fast field cycling NMR relaxometry." In Annual Reports on NMR Spectroscopy, 141–88. Elsevier, 2021. http://dx.doi.org/10.1016/bs.arnmr.2021.05.001.

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Тези доповідей конференцій з теми "Field Cycling NMR"

Gao, Jun, Hyung T. Kwak, and Ahmad M. Al Harbi. "Wettability Evaluation by Fast Field Cycling NMR Relaxometry." In SPE Kingdom of Saudi Arabia Annual Technical Symposium and Exhibition. Society of Petroleum Engineers, 2018. http://dx.doi.org/10.2118/192254-ms.

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Pereira, Bruno, Duarte M. Sousa, and Antonio Roque. "Electromagnetic and thermal aspects of a Fast Field Cycling NMR equipment." In 2015 9th International Conference on Compatibility and Power Electronics (CPE). IEEE, 2015. http://dx.doi.org/10.1109/cpe.2015.7231109.

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Sousa, D. M. "Temperature Controller of the Sample of a Fast Field Cycling NMR Spectrometer." In 2007 International Conference on Power Engineering, Energy and Electrical Drives. IEEE, 2007. http://dx.doi.org/10.1109/powereng.2007.4380178.

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Sousa, Duarte M., Gil D. Marques, and Pedro J. Sebastiao. "Reducing the size of Fast Field Cycling NMR spectrometers based on the use of IGBTs." In 2009 IEEE International Conference on Industrial Technology - (ICIT). IEEE, 2009. http://dx.doi.org/10.1109/icit.2009.4939549.

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Kagawa, A., M. Negoro, K. Takeda, M. Kitagawa, and Alexander Lvovsky. "Magnetic-field cycling triplet-DNP∕NMR system for true quantum computation with hyperpolarized nuclear spins." In QUANTUM COMMUNICATION, MEASUREMENT AND COMPUTING (QCMC): Ninth International Conference on QCMC. AIP, 2009. http://dx.doi.org/10.1063/1.3131333.

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Badea, Codruţa, Andrea Bede, and Ioan Ardelean. "The effect of silica fume on early hydration of white Portland cement via fast field cycling-NMR relaxometry." In 11TH INTERNATIONAL CONFERENCE OF PROCESSES IN ISOTOPES AND MOLECULES (PIM 2017). Author(s), 2017. http://dx.doi.org/10.1063/1.5018283.

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Adil, Mukanov. "From Field Trial to Full-Scale Deployment of Pulse Waterflooding on Mature Oil Fields. Incremental Oil at No Cost." In ADIPEC. SPE, 2023. http://dx.doi.org/10.2118/216329-ms.

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Abstract Pulse or cyclic waterflooding is a well-known technique to optimize water injection schematics, that requires virtually neither capital nor operational expenditures. Therefore, it is very attractive for marginally mature oil fields to stabilize and even boost oil production with the aim of improving economics. So, the paper demonstrates successful case studies from the South-Turgai Basin in Kazakhstan. Pulse waterflooding was implemented by increasing the injection volumes of one group of injectors and choking or shutting down another, thereby, sending periodic pulses in a sandstone formation. The pulses created translate into a fast pressure drop in high permeability and a slow pressure drop in low layers, causing a pressure differential and fluid crossflow. So, it was designed for stratified heterogeneous reservoirs, where we couldn't properly displace oil from poor zones. The theory was put into practice in the KK field trial area, and unexpectedly, we achieved profound improvements in production performance. Thus, the next step was to upscale the activity on other sites. As a result of the first trial, more than 150 Mbbl of oil increment was obtained. That was promising, and the second field went through the same procedure. Pulse waterflooding was applied to the north and south parts, divided by the extensive gas cap of the A field. Most producers in both parts exhibit a clear trend of not only stabilization but also gradual growth. That was mainly reached due to an increase in fluid rates and no changes or event reduction in watercut. Previously, the average oil rate in the south had steadily declined at a 26% annual rate, but after that, it increased for the first time in 10 years. A similar picture is observed in the north, where a 22% annual decline turned into a rate stabilization and then increase. Eventually, the total oil increment is 21 400 tons or 166 Mbbl. Pulse waterflooding proved to be an efficient EOR technique. If wisely applied, waterflooding optimization by playing with rates of injection patterns can lead to considerable sweep efficiency and, in turn, recovery factor. Finally, the most critical aspect of this story is that 166 Mbbl of oil increment costs zero for the operating company. That becomes the best option in terms of economics and the extension of fields’ lives.

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Kostenko, Yevgen, Henning Almstedt, Konstantin Naumenko, Stefan Linn, and Alfred Scholz. "Robust Methods for Creep Fatigue Analysis of Power Plant Components Under Cyclic Transient Thermal Loading." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-95680.

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The aim of this paper is to apply robust mechanisms-based material laws to the analysis of typical high-temperature power plant components during an idealized start-up, hold time and shut-down sequence under a moderate temperature gradient. Among others a robust constitutive model is discussed, which is able to reflect inelastic deformation, hardening/recovery, softening and damage processes at high temperature. The model is applied for a creep analysis of advanced 9–12%CrMoV heat resistant steels and calibrated in particular case against experimental data for 10%CrMoV steel type. For a steam temperature profile transient heat transfer analysis of an idealized steam turbine component is performed providing the temperature field. From the subsequent structural analysis with the inelastic constitutive model local stress and strain state variations are obtained. As an outcome a multi-axial thermo-mechanical fatigue (TMF) loading loop for one or several loading cycles can be generated. They serve as input for a fatigue life assessment based on the generalized damage accumulation rule, whose results come close to reality. In addition, the accuracy of a simplified method which allows a rapid estimation of notch stresses and strains using a notch assessment rule (NAR) [1] based on Neuber approach is examined.

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Smyth, Robert J., and Derek K. Spitzmacher. "Case History of Repairing Cracking in the Seam Welds of 1950 Vintage Pipe Using the Steel Compression Reinforcement Technology." In 2002 4th International Pipeline Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ipc2002-27079.

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Platte Pipeline operates a 1500 km NPS 20” (508 mm) crude oil pipeline connecting Casper, Wyoming to Wood River, Illinois USA. The pipeline was constructed in the early 1950’s with low frequency electric resistance welded (ERW) and flash welded (FW) pipe. The Steel Compression Reinforcement Technology (PetroSleeve) was used to repair active ERW and FW seam cracking detected by an in-line inspection tool. All repairs were performed while the pipeline was in operation. Prior to undertaking the field rehabilitation program, engineering analysis and severe testing was performed to confirm that the steel compression reinforcement technology would arrest fatigue crack extension. Two significant defects were manufactured in the long seam of separate sections of 1950’s vintage line pipe that had been removed from service. The defects included a 50% through-wall manufactured crack and a 70% through-wall electrically discharged machined semi-elliptical slot anomaly. Compression sleeves were installed over both defects, and cycled 36,500 times with internal pressures ranging from 700 kPa to 8000 kPa. Following the cyclic pressuring, the crack and corrosion anomalies were metallurgically inspected. No crack extension or crack development was observed nor detected. At the conclusion of the engineering testing and analysis, it was accepted that the technology permanently restored the serviceability of the pipe by reducing stress levels and preventing crack growth. Platte Pipeline saved significant dollars by using this technology. The time and expenses associated with nitrogen purges and pipe cutouts were avoided. Also, Platte was able to maintain crude oil deliveries at near normal levels throughout the repair program. This paper reviews the engineering analysis, cyclic testing, and field installation practices associated with the Platte rehabilitation program.

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Pereira, João C. R., Jeroen Van Wittenberghe, Abílio Jesus, Philippe Thibaux, and António A. Fernandes. "Ultra-Low-Cycle Fatigue Behavior of Full-Scale Straight Pipes Under Alternating Bending." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63866.

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Ultra or extreme low-cycle fatigue of steels has been deserving increasing interest by the researchers since it corresponds to a fatigue domain not fully understood nor explored. It has been recognized that fatigue damage under extreme loading conditions is representative of several practical applications (e.g. seismic actions, accidental loads) and pipelines are a type of components that could undergo such extreme loading conditions. In addition, concerning the pipelines, reeling could also contribute to significant plastic cycles. ULCF damage corresponds to a transition damage behavior between the LCF and monotonic ductile damage. Therefore studies on ULCF usually needs to cover those bounding damage processes. ULCF testing exploring large-scale specimens is rare. The aim of this paper is to investigate the ultra-low-cycle fatigue of large-scale straight pipes subjected to cyclic pure bending tests which were performed under the framework of the ULCF European/RFCS project. In detail, two steel grades used on pipelines manufacturing were investigated, namely the X60 and X65 piping steels, respectively with the following nominal diameters of 16” (w.t. 9.5 mm) and 8 5/8” (w.t. 5.59 mm). A specifically developed testing setup was used to perform the cyclic bending of the straight pipes, combined with internal pressure, until the pipes collapse. The failure was preceded by local plastic instability (buckling), motivating the concentration of cyclic plastic deformation leading to macroscopic crack initiation and propagation. In addition to the full-scale tests, the plain material was investigated under monotonic and ULCF conditions using both smooth and notched specimens. In order to assess the stress/strain fields in the straight pipes, finite element models of the straight pipes were developed and simulations were performed under the experimental displacement histories. Nonlinear plasticity models with kinematic hardening, inputted on finite element simulations, were calibrated by means of small-scale data. Moreover, the test data of small-scale tests was used on the identification of damage models constants (e.g. Coffin-Manson), which in turn were applied to simulate the failure cycles of the tested straight pipes. The ASME B&PVC VIII Div.2 procedures were also used to compute the failure cycles for the straight pipes to allow an assessment of these existing procedures.

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