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Littérature scientifique sur le sujet « Proton and phosphorus Nuclear Magnetic Resonance »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Proton and phosphorus Nuclear Magnetic Resonance"

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Ghasemi, Mir Majid, and Manouchehr Bahrami. "MEMS NUCLEAR MAGNETIC RESONANCE MICROCOIL." Biomedical Engineering: Applications, Basis and Communications 29, no. 02 (2017): 1750009. http://dx.doi.org/10.4015/s1016237217500090.

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NMR is one of the important analytic tools which is used to obtain certain information such as metabolic concentrations in neural or muscular tissues. In some other important applications such as proton decoupling, it is necessary to design NMR transmitters/receivers capable of operating at multiple frequencies, while maintaining a good performance at each frequency. In this work, a new nuclear magnetic resonance (NMR) receiver microcoil based on MEMS technology is proposed. The designed structure uses MEMS microswitches with low contact resistance and NMR-based actuation mechanism. The proposed device can detect carbon (13C), proton (1H), and phosphorus (31p) nucleus with larmor frequencies of 96.36[Formula: see text]MHz, 383[Formula: see text]MHz, and 155.11[Formula: see text]MHz at 9 T magnetic field, respectively. The designed microcoil achieves three important goals: (1) Getting high SNR, high Q and high filling factor which are key parameters in NMR performance, by changing number of turns. (2) Turning into the array of microcoils to obtain better SNR. (3) Turning into two or three microcoils inside of each other for simultaneous detection. The MEMS microswitch in this paper uses static magnetic field of the NMR for its operation ([Formula: see text]T) which simplifies the switch mechanism. This switch is small (150[Formula: see text][Formula: see text]m[Formula: see text][Formula: see text][Formula: see text]50[Formula: see text][Formula: see text]m[Formula: see text][Formula: see text][Formula: see text]6[Formula: see text][Formula: see text]m), scattering parameters of 43.2[Formula: see text]db isolation and 0.0059 insertion loss and maximum displacement of 2.03[Formula: see text][Formula: see text]m due to the magnetostatic actuation. In this work, the models and investigations are conducted using finite element simulations in COMSOL Multiphysics. The switch scattering parameters are obtained by HFSS 12.0.
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Sugiyama, Hiroshi, Yasuhisa Senda, and Jun-ichi Ishiyama. "Proton, carbon, and phosphorus nuclear magnetic resonance and conformational studies on phosphate esters." Journal of the Chemical Society, Perkin Transactions 2, no. 3 (1987): 391. http://dx.doi.org/10.1039/p29870000391.

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Stuhrmann, Heinrich B. "Small-angle scattering and its interplay with crystallography, contrast variation in SAXS and SANS." Acta Crystallographica Section A Foundations of Crystallography 64, no. 1 (2007): 181–91. http://dx.doi.org/10.1107/s0108767307046569.

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Methods of contrast variation are tools that are essential in macromolecular structure research. Anomalous dispersion of X-ray diffraction is widely used in protein crystallography. Recent attempts to extend this method to native resonant labels like sulfur and phosphorus are promising. Substitution of hydrogen isotopes is central to biological applications of neutron scattering. Proton spin polarization considerably enhances an existing contrast prepared by isotopic substitution. Concepts and methods of nuclear magnetic resonance (NMR) become an important ingredient in neutron scattering from dynamically polarized targets.
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Khan, Shahid A., I. Jane Cox, Andrew V. Thillainayagam, Devinder S. Bansi, Howard C. Thomas, and Simon D. Taylor-Robinson. "Proton and phosphorus-31 nuclear magnetic resonance spectroscopy of human bile in hepatopancreaticobiliary cancer." European Journal of Gastroenterology & Hepatology 17, no. 7 (2005): 733–38. http://dx.doi.org/10.1097/00042737-200507000-00007.

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Rivera, Debra. "Emerging Role for 7T MRI and Metabolic Imaging for Pancreatic and Liver Cancer." Metabolites 12, no. 5 (2022): 409. http://dx.doi.org/10.3390/metabo12050409.

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Advances in magnet technologies have led to next generation 7T magnetic resonance scanners which can fit in the footprint and price point of conventional hospital scanners (1.5–3T). It is therefore worth asking if there is a role for 7T magnetic resonance imaging and spectroscopy for the treatment of solid tumor cancers. Herein, we survey the medical literature to evaluate the unmet clinical needs for patients with pancreatic and hepatic cancer, and the potential of ultra-high field proton imaging and phosphorus spectroscopy to fulfil those needs. We draw on clinical literature, preclinical data, nuclear magnetic resonance spectroscopic data of human derived samples, and the efforts to date with 7T imaging and phosphorus spectroscopy. At 7T, the imaging capabilities approach histological resolution. The spectral and spatial resolution enhancements at high field for phospholipid spectroscopy have the potential to reduce the number of exploratory surgeries due to tumor boundaries undefined at conventional field strengths. Phosphorus metabolic imaging at 7T magnetic field strength, is already a mainstay in preclinical models for molecular phenotyping, energetic status evaluation, dosimetry, and assessing treatment response for both pancreatic and liver cancers. Metabolic imaging of primary tumors and lymph nodes may provide powerful metrics to aid staging and treatment response. As tumor tissues contain extreme levels of phospholipid metabolites compared to the background signal, even spectroscopic volumes containing less than 50% tumor can be detected and/or monitored. Phosphorus spectroscopy allows non-invasive pH measurements, indicating hypoxia, as a predictor of patients likely to recur. We conclude that 7T multiparametric approaches that include metabolic imaging with phosphorus spectroscopy have the potential to meet the unmet needs of non-invasive location-specific treatment monitoring, lymph node staging, and the reduction in unnecessary surgeries for patients undergoing resections for pancreatic cancer. There is also potential for the use of 7T phosphorous spectra for the phenotyping of tumor subtypes and even early diagnosis (<2 mL). Whether or not 7T can be used for all patients within the next decade, the technology is likely to speed up the translation of new therapeutics.
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Brauer, Manfred, and Steven Locke. "Proton magnetic resonance imaging and phosphorus-31 magnetic resonance spectroscopy studies of bromobenzene-induced liver damage in the rat." Magnetic Resonance Imaging 10, no. 2 (1992): 257–67. http://dx.doi.org/10.1016/0730-725x(92)90485-i.

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van der Kemp, Wybe J. M., Bertine L. Stehouwer, Vincent O. Boer, Peter R. Luijten, Dennis W. J. Klomp, and Jannie P. Wijnen. "Proton and phosphorus magnetic resonance spectroscopy of the healthy human breast at 7 T." NMR in Biomedicine 30, no. 2 (2016): e3684. http://dx.doi.org/10.1002/nbm.3684.

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Yan, Yanan, and Bing Liang. "Flame-retardant behavior and mechanism of a DOPO-based phosphorus–nitrogen flame retardant in epoxy resin." High Performance Polymers 31, no. 8 (2018): 885–92. http://dx.doi.org/10.1177/0954008318805794.

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A novel flame-retardant additive, 6,6′,6″-((1,3,5-triazine-2,4,6 triyl) tris (azanediyl)) tris (dibenzo[c,e][1,2]oxaphosphinine 6-oxide) (DOPO-M), was synthesized from melamine and 9,10-dihy-dro-9-oxa-10-phosphaphenanthrene 10-oxide (DOPO). The structure of DOPO-M was characterized by Fourier transform infrared (FTIR) spectroscopy, proton (1H) and phosphorous (31P) nuclear magnetic resonance (NMR) spectroscopies, and electrospray ionization mass spectroscopy (ESI-MS). DOPO-M was blended into epoxy resin (EP) to prepare flame-retardant EPs. The flame-retardant and thermal properties of EPs cured with triethylenetetramine (TETA) were investigated by thermogravimetric analysis (TGA), the UL-94 test, and the limiting oxygen index (LOI) test. The results revealed that the epoxy thermosets exhibited excellent flame retardancy and passed the V-0 rating of the UL-94 test with an LOI of 29.3% when the phosphorus content was 2.57 wt%. The scanning electron microscopy (SEM) results showed that DOPO-M in the EP/TETA system obviously accelerated the formation of a stronger, phosphorus-rich sealing char layer to improve the flame-retardant properties of the matrix during combustion.
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Harrison, Philip G., and Thakor Kikabhai. "Proton and phosphorus-31 nuclear magnetic resonance study of zinc(II)O,O′-dialkyl dithiophosphates in solution." J. Chem. Soc., Dalton Trans., no. 4 (1987): 807–14. http://dx.doi.org/10.1039/dt9870000807.

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Théberge, Jean, Yousef Al-Semaan, J. Eric Jensen, et al. "Comparative study of proton and phosphorus magnetic resonance spectroscopy in schizophrenia at 4 Tesla." Psychiatry Research: Neuroimaging 132, no. 1 (2004): 33–39. http://dx.doi.org/10.1016/j.pscychresns.2004.08.001.

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Thèses sur le sujet "Proton and phosphorus Nuclear Magnetic Resonance"

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Potwarka, John J. "A proton decoupled phosphorus-31 nuclear magnetic resonance spectroscopy study of schizophrenia." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape10/PQDD_0019/MQ58006.pdf.

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SIOTTO, MICHELA BARBARA. "Study of the biodegradation in soil of new generation plactics." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2011. http://hdl.handle.net/10281/19950.

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The intense use of plastic contributes to increase the amount of municipal waste that are generally disposed in landfill. For some applications and sectors, an important alternative to the conventional plastic materials can be found in the use of the new generation materials: the biodegradable polymers. Their use can be an alternative to landfill disposal and can thus reduce the cost of waste management and the accumulation in the environment. The biodegradable polymers, in fact, are used by microorganisms as source of carbon and are converted by into carbon dioxide (or methane), water and mineral salts of any other element present (mineralization) plus new biomass. Generally, laboratory test methods developed for determining the biodegradability of polymeric material are based on the evaluation of the carbon dioxide production (respirometric test), but in order to completely describe the biodegradation process and to avoid an underestimation of the biodegradation percentage, it is very important to quantify and identify possible by-products and biomass production. The experimental work presents in this thesis concerned the study of the different aspects of the biodegradation of new generation plastics in soil. Particular attention was focused on the fate of the possible by-products of biodegradable polymers (the monomers) and on the determination of the biomass generated during the process. To summarize: 1) The effects of the soil pH on the mineralization of ten monomers, chosen between the most widely used for the synthesis of plastic materials, was evaluated by respirometric tests and the experimental data were used to validate a numerical model that can estimate the amount of carbon used by microorganism for biochemical synthesis. 2) The mineralization of a model polyester was investigated by respirometric tests in different soil mixtures in order to evaluate the effects of the initial soil pH and of the addition of organic matter. 3) The combustion of soil samples at 550 °C was used for determining the amount of organic matter and biomass in soil samples. The sensitivity of the method was evaluated by adding different low amounts of organic matter to a natural and a synthetic soil. 4) In order to describe the carbon balance during the biodegradation of the model polyester, biomass production and polyester residues in soil were estimated. Biomass and organic matter deriving by polyester biodegradation were studied by combustion of soil samples. Polyester residues were estimated by extractions in soxhlet of soil samples (with chloroform) and the extracts were characterized by 1H-NMR and 31P-NMR acquisitions and GPC.
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Meng, Jiqun J. "Line scan proton magnetic resonance spectroscopic imaging." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/36963.

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Kendall, Nigel Lincoln. "Nuclear magnetic resonance study of new polycyclic phosphorus compounds." Thesis, University of Newcastle Upon Tyne, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.481631.

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Wilkes, Philip John. "NMR of phosphorus-containing solids." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6666/.

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The purpose of this work has been the determination of structure in solids using the technique of solid-state nuclear magnetic resonance spectroscopy. High-resolution (^31) p NMR spectra have been obtained for a range of phosphate species. A number of techniques have been applied to these systems including cross-polarization, magic angle spinning, and high power proton decoupling. Characterisation using additional NMR techniques such as (^1) H cramps has been carried out wherever possible. The results obtained yield molecular and crystallographic information consistent with data from X-ray diffraction when known. Shielding tensor components were determined from static and/or spinning spectra wherever possible. The phosphate species studied include a series of precipitated calcium phosphates. A particular model for the structure of amorphous calcium phosphate is favoured in the light of (^31) p NMR measurements. One sample showed NMR evidence for changes in composition whilst in the solid state. The origins of (^31) p NMR line widths in high-resolution solid-state spectra have been considered in some detail. Variation of (^31) p NMR linewidth as function of spinning rate has been noted for a number phosphate compounds. Multiple pulse techniques have been applied on the phosphorus channel with pleasing improvements in spectral resolution. Five solid binary phosphorus sulphides have also been studied using phosphorus MAS NMR, and the results compared to solution state data wherever possible. A number of anomalies between solution and solid-state data have been noted and discussed.
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Florian, Catarina Ligia. "Proton nuclear magnetic resonance studies of human glioma cell lines." Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309218.

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Sitanggang, M. Linda. "Application of proton nuclear magnetic resonance in drug metabolism studies." Thesis, University of Bath, 1988. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380409.

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Clarke, William. "Human cardiac magnetic resonance spectroscopy." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:b75351dc-e4eb-4856-b901-4ba486ffe175.

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The status of the myocardial 'high energy phosphate' metabolism is a sensitive marker of the occurrence and progression of heart failure. Magnetic resonance spectroscopy enables non-invasive, direct and potentially quantitative measurements of the phosphate containing metabolites present in the human myocardium. This thesis is primarily concerned with the creation of measurement techniques for cardiac phosphorus magnetic resonance spectroscopy (<sup>31</sup>P-MRS) at the 7 tesla field strength. Chapter 1 provides an overview of the physical basis of magnetic resonance spectroscopy, the myocardial high energy phosphate metabolism, and the clinical relevance of the technique. Chapter 2 describes the advantage of 7 tesla scanners over lower field strengths. The radio frequency coil hardware is characterised experimentally. The multivoxel spectroscopy methods used throughout the thesis are described. Chapter 3 details the implementation of an open source spectroscopy fitting program. It is validated against previous closed-source implementations. The program's use is demonstrated in several clinical studies of heart failure, and to improve a previously implemented <sup>1</sup>H spectroscopy coil combination method. In Chapter 4 the measurement of inorganic phosphate in the presence of overlapping peaks is attempted. Suppression of overlapping peaks, originating from the blood, is tried using B<sub>o</sub> gradients, then saturation transfer. The myocardial pH of hypertrophic cardiomyopathy patients is measured. Chapter 5 describes the effect of creatine kinase catalysed chemical exchange on the <sup>31</sup>P-MRS spectrum. A survey of methods suitable for measuring creatine kinase kinetics at 7 tesla is made. Multi-parametric fitting of variable repetition time saturation transfer data is explored in simulation and experiment. Chapter 6 describes the re-implementation and extension, for dynamic measurements, of the triple repetition time saturation transfer method for two clinical studies at 3 tesla. The creatine kinase forward rate constant is measured in heart failure and healthy cohorts, at rest, and during cardiac stress. In Chapter 7 a Bloch-Siegert B<sub>1</sub> mapping sequence is implemented for <sup>31</sup>P-MRS. An optimal Bloch-Siegert method for X-nuclear spectroscopy is calculated. B<sub>1</sub>maps are validated in skeletal muscle and collected in 5 volunteer's hearts. Chapter 8 uses the Bloch-Siegert B<sub>1</sub> mapping sequence and the four angle saturation transfer method to implement creatine kinase rate measurement at 7 tesla. The first 3D localised creatine kinase rate measurements in the human myocardium are achieved in 10 volunteers.
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Princz, Eva J. "A proton nuclear magnetic resonance study of human tumor biopsy samples." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/6000.

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Vannini, Marianna <1986&gt. "Valorisation of organic waste: new developments from proton nuclear magnetic resonance characterization." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amsdottorato.unibo.it/6946/1/Vannini_Marianna_tesi.pdf.

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The last half-century has seen a continuing population and consumption growth, increasing the competition for land, water and energy. The solution can be found in the new sustainability theories, such as the industrial symbiosis and the zero waste objective. Reducing, reusing and recycling are challenges that the whole world have to consider. This is especially important for organic waste, whose reusing gives interesting results in terms of energy release. Before reusing, organic waste needs a deeper characterization. The non-destructive and non-invasive features of both Nuclear Magnetic Resonance (NMR) relaxometry and imaging (MRI) make them optimal candidates to reach such characterization. In this research, NMR techniques demonstrated to be innovative technologies, but an important work on the hardware and software of the NMR LAGIRN laboratory was initially done, creating new experimental procedures to analyse organic waste samples. The first results came from soil-organic matter interactions. Remediated soils properties were described in function of the organic carbon content, proving the importance of limiting the addition of further organic matter to not inhibit soil processes as nutrients transport. Moreover NMR relaxation times and the signal amplitude of a compost sample, over time, showed that the organic matter degradation of compost is a complex process that involves a number of degradation kinetics, as a function of the mix of waste. Local degradation processes were studied with enhanced quantitative relaxation technique that combines NMR and MRI. The development of this research has finally led to the study of waste before it becomes waste. Since a lot of food is lost when it is still edible, new NMR experiments studied the efficiency of conservation and valorisation processes: apple dehydration, meat preservation and bio-oils production. All these results proved the readiness of NMR for quality controls on a huge kind of organic residues and waste.
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Livres sur le sujet "Proton and phosphorus Nuclear Magnetic Resonance"

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1942-, Burt C. Tyler, ed. Phosphorus NMR in biology. CRC Press, 1987.

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Laboratory guide to proton NMR spectroscopy. Blackwell Scientific Publications, 1988.

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1933-, Tebby John C., ed. CRC handbook of phosphorus-31 nuclear magnetic resonance data. CRC Press, 1991.

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1935-, Verkade John G., and Quin Louis D. 1928-, eds. Phosphorus-31 NMR spectroscopy in stereochemical analysis. VCH Publishers, 1987.

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André, Lirette, and Liu Zengfu, eds. An atlas of chicken embryonic developemnt using proton nuclear magnetic resonance imaging. Nova Scotia Agricultural College, Dept. of Animal Science, 1992.

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Hollerton, J. C. (John C.), 1959-, ed. Essential practical NMR for organic chemistry. Wiley, 2011.

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Tho, Pham Quang, and Pham Quang Tho, eds. Proton and carbon NMR spectra of polymers. Penton Press, 1991.

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Tho, Pham Quang, and Pham Quang Tho, eds. Proton and carbon NMR spectra of polymers. 5th ed. Wiley, 2003.

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1928-, Quin Louis D., and Verkade John G. 1935-, eds. Phosphorus-31 NMR spectral properties in compound characterization and structural analysis. VCH, 1994.

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J, Pouchert Charles, Behnke Jacqlynn, and Aldrich Chemical Company, eds. The Aldrich library of ¹³C and ¹H FT NMR spectra. Aldrich Chemical Co., 1992.

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Chapitres de livres sur le sujet "Proton and phosphorus Nuclear Magnetic Resonance"

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Bendel, P. "Proton NMR Studies on DNA Structure." In Nuclear Magnetic Resonance. Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82609-2_4.

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Noodleman, L., J. L. Chen, D. A. Case, et al. "Isotropic Proton Hyperfine Coupling in High Potential [Fe4S4]3+ Models." In Nuclear Magnetic Resonance of Paramagnetic Macromolecules. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8573-6_16.

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Gupta, R. R., M. D. Lechner, and B. M. Mikhova. "General Introduction to Nuclear Magnetic Resonance (NMR)." In Chemical Shifts and Coupling Constants for Phosphorus-31. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41613-2_1.

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Gupta, R. R., M. D. Lechner, and B. M. Mikhova. "General Introduction to Nuclear Magnetic Resonance (NMR)." In Chemical Shifts and Coupling Constants for Phosphorus-31. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41599-9_1.

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Sauter, R., M. Schneider, K. Wicklow, and H. Kolem. "Techniques for Localisation and Signal Improvement in In Vivo Proton and Phosphorus MR Spectroscopy." In Magnetic Resonance Scanning and Epilepsy. Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2546-2_42.

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Di Vona, Maria Luisa, Emanuela Sgreccia, and Sebastiano Tosto. "Diffusion in Solid Proton Conductors: Theoretical Aspects and Nuclear Magnetic Resonance Analysis." In Solid State Proton Conductors. John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781119962502.ch3.

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Schaumann, Gabriele E. "Proton Nuclear Magnetic Resonance (NMR) Relaxometry in Soil Science." In Encyclopedia of Agrophysics. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-3585-1_223.

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Braunschweiger, Paul G., and Marvin A. Rich. "Application of Proton Nuclear Magnetic Resonance to Tumor Biology." In Cancer Biology and Therapeutics. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4757-9564-6_10.

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Yadav, L. D. S. "Proton Nuclear Magnetic Resonance (PMR or 1H NMR) Spectroscopy." In Organic Spectroscopy. Springer Netherlands, 2005. http://dx.doi.org/10.1007/978-1-4020-2575-4_5.

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Macedo, Anjos L., and José J. G. Moura. "1D and 2D Proton NMR Studies on [3Fe-4S] and [4Fe-4S] Ferredoxins Isolated from Desulfovibrio gigas." In Nuclear Magnetic Resonance of Paramagnetic Macromolecules. Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-015-8573-6_15.

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Actes de conférences sur le sujet "Proton and phosphorus Nuclear Magnetic Resonance"

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Morawitz, Falk. "Multilayered Narration in Electroacoustic Music Composition Using Nuclear Magnetic Resonance Data Sonification and Acousmatic Storytelling." In ICAD 2019: The 25th International Conference on Auditory Display. Department of Computer and Information Sciences, Northumbria University, 2019. http://dx.doi.org/10.21785/icad2019.052.

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Nuclear magnetic resonance (NMR) spectroscopy is an analytical tool to determine the structure of chemical compounds. Unlike other spectroscopic methods, signals recorded using NMR spectrometers are frequently in a range of zero to 20000 Hz, making direct playback possible. As each type of molecule has, based on its structural features, distinct and predictable features in its NMR spectra, NMR data sonification can be used to create auditory ‘fingerprints’ of molecules. This paper describes the methodology of NMR data sonification of the nuclei nitrogen, phosphorous, and oxygen and analyses the sonification products of DNA and protein NMR data. The paper introduces On the Extinction of a Species, an acousmatic music composition combining NMR data sonification and voice narration. Ideas developed in electroacoustic composition, such as acousmatic storytelling and sound-based narration are presented and investigated for their use in sonification-based creative works.
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Wang, Ji S., and Chun F. Xu. "New results on proton nuclear magnetic resonance of a-SiN:H films." In Shanghai - DL tentative, edited by Shixun Zhou and Yongling Wang. SPIE, 1991. http://dx.doi.org/10.1117/12.47337.

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Bryar, Traci R., and Rosemary J. Knight. "Detection Limits for Immiscible Liquid Organic Contaminants Using Proton Nuclear Magnetic Resonance." In Symposium on the Application of Geophysics to Engineering and Environmental Problems 2003. Environment and Engineering Geophysical Society, 2003. http://dx.doi.org/10.4133/1.2923242.

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R. Bryar, Traci, and Rosemary J. Knight. "Detection Limits For Immiscible Liquid Organic Contaminants Using Proton Nuclear Magnetic Resonance." In 16th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems. European Association of Geoscientists & Engineers, 2003. http://dx.doi.org/10.3997/2214-4609-pdb.190.pet02.

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Li, Yue-Rong, Gavin Pereira, Masoud Kasrai, and Peter R. Norton. "Studies on ZDDP Anti-Wear Films Formed Under the Different Conditions by XANES Spectroscopy, Atomic Force Microscopy and 31P NMR." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44218.

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Antiwear (AW) films, generated from a mineral base oil containing zinc dialkyl dithiophosphate (ZDDP) additive, were extensively studied. These films were formed at various conditions such as different temperatures, various loads and rubbing times. The surface morphology of these films was investigated using atomic force microscopy (AFM) and the surface roughness of these films has been calculated from the images. X-ray absorption near edge structure (XANES) spectroscopy has been used to characterize the chemistry of these films. The intensity of phosphorus K-edge was also used to monitor the thickness of these films. Phosphorus L-edge spectra show that these films have slightly variable chemical natures. 31P Nuclear magnetic resonance (31P NMR) was used to study the ZDDP components in the residue oils. The spectra show that the primary and secondary ZDDP decompose quite differently at the various conditions. Tribological characteristics of these AW films were probed by measuring the coefficients of friction and the wear scar width of the counter faces.
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Ni, Qingwen, and Todd Bredbenner. "Characterization of Human Cortical and Trabecular Bone Structural Change by NMR and Micro-CT." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80336.

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The techniques of low-field pulsed proton nuclear magnetic resonance (NMR) spin relaxation and Micro-CT are described for assessment of structural changes of human cortical and trabecular bone in vitro. The technique involves spin-spin relaxation measurement and inversion spin-spin spectral analysis methods for NMR. From NMR measurement, the CPMG T2 relaxation data can be inverted to T2 relaxation distribution and this distribution then can be transformed to a pore size distribution with the longer relaxation times corresponding to larger pores. In Micro-CT measurement, each trabecular bone specimen was individually scanned using a micro-computed tomography (micro-CT) system and 12 micron dimensionally-isotropic voxels were reconstructed. Due to the resolution limitation, Micro-CT measurement on cortical bone was not success, however, NMR measurement was success for both cortical and trabecular bones.
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Martin, Jacob, Austin Downey, and Sang Hee Won. "Compact Time Domain NMR Design for the Determination of Hydrogen Content in Gas Turbine Fuels." In ASME 2022 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/detc2022-90023.

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Abstract Low-resolution nuclear magnetic resonance is a tool that has been employed for many years as an effective method for analyzing complex materials in a non-destructive fashion. This work has been aimed at the development of a prototype compact NMR system with the potential to be utilized for simple and rapid in situ measurements of key properties of jet fuels. The compact system consists of a neodymium magnet configuration with a field strength of 0.645 T, custom printed circuit boards, and radio frequency electronics. It is driven by a National Instruments PXI chassis fitted with modules that control the excitation and detection of hydrogen proton resonance in various samples. The current system is suitable for transverse relaxation (T2) studies using the Carr-Purcell-Meiboom-Gill pulse sequence, as it can produce relaxation curves containing thousands of spin echoes. Determination of hydrogen content (mass %), which is strongly correlated to combustion properties of fuels, is the primary area of interest for this study. Utilizing an array of 16 reference samples, a direct correlation between initial signal amplitude and hydrogen density (kmol/m3) was established. This relationship, along with mass density measurements, was used to determine hydrogen content in six different jet fuels. The maximum error between measured and accepted values for the fuels was 0.7%.
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Daino, Michael M., and Satish G. Kandlikar. "Evaluation of Imaging Techniques Applied to Water Management Research in PEMFCs." In ASME 2009 7th International Conference on Nanochannels, Microchannels, and Minichannels. ASMEDC, 2009. http://dx.doi.org/10.1115/icnmm2009-82031.

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Water management in proton exchange membrane fuel cells (PEMFCs) is critical in efficient operation of fuel cells during normal operation as well as purge and start-up conditions. Insufficient membrane hydration impedes the flow of protons and an overabundance of water obstructs the flow of reactants in the gas diffusion layer (GDL) and in gas distribution channels. These two extremes of water content in PEMFCs significantly reduce performance and efficiency, causing material degradation and potential failure. Visualization and quantitative measurement of water content in PEMFCs lead to greater comprehension of water distribution and transport processes. A wide variety of imaging techniques have been employed in literature to reveal water distribution and transport processes on both macroscale and microscale. The presented techniques utilize visible, infrared, X-rays, fluorescence microscopy, nuclear magnetic resonance (NMR), and neutron radiography to visualize water, measure temperature distributions, and quantify water content. Each imaging technique has intrinsic advantages, disadvantages, and limitations for water detection and will be discussed. A critical evaluation of these techniques and their suitability for visualization of specific components of PEMFC are also discussed.
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Heo, Yunseon, and Henry A. Sodano. "Thermo-Responsive Shape Memory Self-Healing Polyurethanes and Composites With Continuous Carbon Fiber Reinforcement." In ASME 2015 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/smasis2015-8916.

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Thermally responsive self-healing polyurethanes (1DA1T, 1.5DA1T, and 2DA1H) with shape memory property were developed and the fully reversible Diels-Alder (DA) and retro Diels-Alder (rDA) reactions were employed for the healing mechanism. The transition temperatures of the DA and rDA reactions were confirmed through a differential scanning calorimetry and the molecular level of analysis on the reversibility and the repeatability between the DA and rDA reactions were completed though a variable temperature proton nuclear magnetic resonance at the reaction temperatures. Also, compact tension specimens were made to observe the healing efficiencies. These specimens were healed without the use of external forces to close the crack surfaces after testing for the repeatable healing ability with three cycles. As a result, the average first healing cycle efficiencies of 80%, 84%, and 96% for 1DA1T, 1.5DA1T and 2DA1H, respectively, were achieved and small drops for the second and third healing cycles were observed. Then, using two of the self-healing polyurethanes as resins, continuous carbon fiber fabric reinforced polymer matrix composites (C1.5DA1T and C2DA1H) were fabricated and short beam shear testing was conducted to determine the healing capability on the delamination. Accordingly, the first healing efficiencies of 88% and 85% were measured without any additional treatments on the fibers; however, an external pressure was applied during the composite healing process.
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Aguiar, Janaina I. S., Hamidreza Samouei, and Amir Mahmoudkhani. "Uncovering Mysteries of Waxphaltenes: Meticulous Experimental Studies of Field and Lab Deposits Unveil Nature of Wax-Asphaltene Intermolecular Interactions." In SPE International Conference on Oilfield Chemistry. SPE, 2021. http://dx.doi.org/10.2118/204315-ms.

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Abstract In recent years, the utilization of modern sampling tools provided access to the field deposits from several offshore and onshore wells producing asphaltenic crudes. Compositional analysis of field deposits revealed the presence of asphaltenes and wax as major fractions, while system conditions traditionally implied precipitation and deposition of asphaltenes only. Most of the previous studies on organic deposition have been conducted with the key assumption that aggregation and precipitation of wax and asphaltene occur independently. A few researchers investigated the solubility parameter's alteration, but they did not incorporate waxes found in the oilfield deposits. This study aims to investigate the nature of "waxphaltenes"; from intermolecular interactions between asphaltenes and wax in samples collected from fields and made in the laboratory. Asphaltenes samples were extracted and fully characterized by proton nuclear magnetic resonance (NMR) and Fourier-transform infrared spectroscopy (FTIR). Paraffin waxes were identified using gas chromatography (GC), differential scanning calorimetry (DSC), NMR, and FTIR. Precipitation tests of asphaltenes with n-heptane at high temperature were performed both in the presence and absence of wax; GC, NMR and FTIR techniques evaluated the precipitates and the material dispersed in solution. It was found that asphaltenes co-precipitated with waxes even at higher temperatures than the normal wax appearance temperature (WAT) of the crude oil or the model solutions and that long and medium size paraffin waxes had higher tendencies to coprecipitate with asphaltenes than either short chain or very long chain paraffin hydrocarbons. The results also indicated that the amount of wax that co-precipitates with asphaltenes was more related to asphaltene structure but is independent of the asphaltenes or wax content. Heteroatoms played an important role in the interactions between wax and asphaltenes during precipitation and separation.
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Rapports d'organisations sur le sujet "Proton and phosphorus Nuclear Magnetic Resonance"

1

Smith, R. E. Phosphorus-31 NMR (nuclear magnetic resonance) analysis of gold plating baths. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/5098253.

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Kong, Zueqian. Characterization of proton exchange membrane materials for fuel cells by solid state nuclear magnetic resonance. Office of Scientific and Technical Information (OSTI), 2010. http://dx.doi.org/10.2172/976274.

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Logan, Thomas P., and David A. Sartori. Proton Nuclear Magnetic Resonance Spectra of Sulfur Mustard and 2-Chloroethyl Ethyl Sulfide in Selected Solvents. Defense Technical Information Center, 2002. http://dx.doi.org/10.21236/ada411995.

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Doetschman, D. C., R. C. Mehlenbacher, and O. Ito. A study of coal extraction with electron paramagnetic resonance (EPR) and proton nuclear magnetic resonance relaxation techniques. Quarterly technical progress report, April 1, 1993--June 30, 1993. Office of Scientific and Technical Information (OSTI), 1993. http://dx.doi.org/10.2172/10180889.

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White, Thomas, Fernando Fondeur, Charles Coleman, David Diprete, Cecilia Diprete, and Brian Looney. Proton Nuclear Magnetic Resonance (H NMR) of Glycolate in Real Waste: Developing and Testing Analytical Methods for the Savannah River Site Liquid Waste System. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1784925.

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Yee, Sidney. Solution-State Proton Nuclear Magnetic Resonance (NMR) Spectroscopic Studies of the Active Site of Myoglobins in Various Ligated States: Models for Macromolecule-Substrate Binding and Advancement of Paramagnetic NMR Techniques. Portland State University Library, 2000. http://dx.doi.org/10.15760/etd.1252.

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Fernando, P. U. Ashvin Iresh, Gilbert Kosgei, Matthew Glasscott, Garrett George, Erik Alberts, and Lee Moores. Boronic acid functionalized ferrocene derivatives towards fluoride sensing. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/44762.

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In this technical report (TR), a robust, readily synthesized molecule with a ferrocene core appended with one or two boronic acid moieties was designed, synthesized, and used toward F- (free fluoride) detection. Through Lewis acid-base interactions, the boronic acid derivatives are capable of binding with F- in an aqueous solution via ligand exchange reaction and is specific to fluoride ion. Fluoride binding to ferrocene causes significant changes in fluorescence or electrochemical responses that can be monitored with field-portable instrumentation at concentrations below the WHO recommended limit. The F- binding interaction was further monitored via proton nuclear magnetic resonance spectroscopy (1H-NMR). In addition, fluorescent spectroscopy of the boronic acid moiety and electrochemical monitoring of the ferrocene moiety will allow detection and estimation of F- concentration precisely in a solution matrix. The current work shows lower detection limit (LOD) of ~15 μM (285 μg/L) which is below the WHO standards. Preliminary computational calculations showed the boronic acid moieties attached to the ferrocene core interacted with the fluoride ion. Also, the ionization diagrams indicate the amides and the boronic acid groups can be ionized forming strong ionic interactions with fluoride ions in addition to hydrogen bonding interactions.
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