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Littérature scientifique sur le sujet « Time domain NMR »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Time domain NMR"

Litvinov, Victor, et Yongfeng Men. « Time-domain NMR in polyolefin research ». Polymer 256 (septembre 2022) : 125205. http://dx.doi.org/10.1016/j.polymer.2022.125205.

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Todt, Harald, Wolfgang Burk, Gisela Guthausen, Andreas Guthausen, Andreas Kamlowski et Dieter Schmalbein. « Quality control with time-domain NMR ». European Journal of Lipid Science and Technology 103, n^o 12 (décembre 2001) : 835–40. http://dx.doi.org/10.1002/1438-9312(200112)103:12<835 ::aid-ejlt835>3.0.co;2-p.

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Bielecki, A., D. B. Zax, A. M. Thayer, J. M. Millar et A. Pines. « Time Domain Zero Field NMR and NQR ». Zeitschrift für Naturforschung A 41, n^o 1-2 (1 février 1986) : 440–44. http://dx.doi.org/10.1515/zna-1986-1-286.

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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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Le Botlan, D., F. Casseron et F. Lantier. « Polymorphism of sugars studied by time domain NMR ». Analusis 26, n^o 5 (juin 1998) : 198–204. http://dx.doi.org/10.1051/analusis:1998135.

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Romano, Rocco, Maria Teresa Santini et Pietro Luigi Indovina. « A Time-Domain Algorithm for NMR Spectral Normalization ». Journal of Magnetic Resonance 146, n^o 1 (septembre 2000) : 89–99. http://dx.doi.org/10.1006/jmre.2000.2102.

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Pedroso, João, João Camporez, Luciana Belpiede, Rafaela Pinto, José Cipolla-Neto et Jose Donato. « Evaluation of Hepatic Steatosis in Rodents by Time-Domain Nuclear Magnetic Resonance ». Diagnostics 9, n^o 4 (20 novembre 2019) : 198. http://dx.doi.org/10.3390/diagnostics9040198.

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Devices that analyze body composition of rodents by time-domain nuclear magnetic resonance (TD-NMR) are becoming popular in research centers that study metabolism. Theoretically, TD-NMR devices can also evaluate lipid content in isolated tissues. However, the accuracy of TD-NMR to determine hepatic steatosis in the liver of small laboratory animals has not been evaluated in detail. We observed that TD-NMR was able to detect increased lipid content in the liver of rats consuming high-fat diet (HFD) for 12 weeks and in genetically obese (Lepob/ob and Leprdb/db) mice. The lipid content determined by TD-NMR showed a positive correlation with triglyceride content measured by colorimetric assays. In contrast, TD-NMR did not detect hepatic steatosis in C57BL/6 mice consuming HFD for 4 or 12 weeks, despite their obesity and increased liver triglyceride content. These findings indicate that tissue mass and the severity of hepatic steatosis affect the sensitivity of TD-NMR to detect liver lipid content.

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Rodrigues, Elton J. R., Pedro J. O. Sebastião et Maria I. B. Tavares. « 1H time domain NMR real time monitoring of polyacrylamide hydrogels synthesis ». Polymer Testing 60 (juillet 2017) : 396–404. http://dx.doi.org/10.1016/j.polymertesting.2017.04.028.

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Rodrigues, Elton Jorge da Rocha, Maxwell de Paula Cavalcante et Maria Inês Bruno Tavares. « Time domain NMR evaluation of poly(vinyl alcohol) xerogels ». Polímeros 26, n^o 3 (8 août 2016) : 221–27. http://dx.doi.org/10.1590/0104-1428.2093.

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Witek, M., H. Peemoeller, J. Szymońska et B. Blicharska. « Investigation of Starch Hydration by 2D Time Domain NMR ». Acta Physica Polonica A 109, n^o 3 (mars 2006) : 359–64. http://dx.doi.org/10.12693/aphyspola.109.359.

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Coggins, Brian E., et Pei Zhou. « Sampling of the NMR time domain along concentric rings ». Journal of Magnetic Resonance 184, n^o 2 (février 2007) : 207–21. http://dx.doi.org/10.1016/j.jmr.2006.10.002.

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Thèses sur le sujet "Time domain NMR"

Urbańczyk, Mateusz, Wiktor Koźmiński et Krzysztof Kazimierczuk. « A combined sparse sampling of time-gradient domain for NMR diffusometry and relaxometry : A combined sparse sampling of time-gradient domain for NMR diffusometry and relaxometry ». Diffusion fundamentals 20 (2013) 105, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A13693.

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Marigheto, Niusa A. « Time-Domain NMR Studies of the Internal Quality of Horticultural Products ». Thesis, University of East Anglia, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485289.

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Nuclear Magnetic Resonance was used to investigate selected fruit with internal defects and at different stages of ripening. This was motivated by the need for an industrial NMR sensor of fruit and vegetable quality capable of operating at typical industrial conveyor speeds. Such a sensor requires the development of NMR protocols capable of determining fruit and vegetable quality in a single-shot manner. It also requires knowledge of which combination of NMR parameters is most sensitive to the quality factor of interest. In this thesis we therefore address this issue by exploring the off-line relationship between NMR parameters and fruit quality. We mainly focus on three areas: the detection of mealiness in apples, the single-shot measurement of Brix, and a single-shot measurement of oil in avocado. One dimensional techniques, measuring transverse relaxation times, were used as starting point. The correlation between mealiness and one dimensional was not observed at low fields. Therefore two-dimensional approaches were taken. The first of these was correlation spectroscopy, which showed that the of the water associated with the cell wall in mealy apples is much longer that that of fresh apples. This in principle could be used to classify apples. The differences between fresh and mealy apples observed with the second two-dimensional protocol, could ~ot be used to classify apples. However, when the technique was applied to avocado, it became clear that the difference between the diffusion coefficients of water and oil could be exploited for an on-line application. A fast pulse sequence was developed and the off-line measurements showed a good correlation between oil content and the echo ratio. A similar protocol was developed for the on-line measurement of Brix value in apple and strawberry.

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DIBBANTI, MURALI KRISHNA. « Study of polymer cross-link density by time domain NMR spectroscopy ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/83654.

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Elastomeric polymers are important materials for many applications due to their exceptional long-range elastic property obtained by cross-linking. The cross-linking is the process of creating three dimensional network structure in the polymer materials and induces elasticity. Hence, the precise characterization of the molecular weight (Mc) between cross-links or other topological constraints (i.e. entanglements, filler etc.) is essential for tuning the elastic response in polymer networks. There are several techniques available for polymer network cross-link density measurement, among them equilibrium swelling and nuclear magnetic resonance (NMR) spectroscopy are widely used. Particularly multiple–quantum (MQ) NMR spectroscopy technique is emerging as an excellent tool for network characterization in the molecular level for last three decades. The unique advantage of this technique over the equilibrium swelling is that it gives the cross-link density together with cross-link distribution, besides being a rapid and solvent free technique. MQ NMR can be applied on inexpensive low resolution instrument without compromising on the data quality, where chemical shift resolution is not necessary. Moreover, other NMR pulse sequences are available for characterizing other polymer properties such as bound rubber fraction in filled networks, polymer dynamics, segmental motions etc. In the present work, MQ proton NMR has been used to obtain the dipolar coupling constant and the cross-link density in different classes of elastomers (commercial formulation for tire industry, polyacrylate networks and shape memory ionic elastomers). The robustness of the cross-link density measurements obtained from equilibrium swelling method (both phenomenological and statistical models) is compared with MQ NMR results in formulation for tire application. Thiol probes have been applied to quantify ranking of sulfidic bridges as a function of curing time in the network. The Kraus, Lorenz and Parks correction for filler restriction on swelling has been validated from the MQ NMR results. Differently from the published papers, focused on the effect of different vulcanization conditions at the optimum curing time, here the kinetics of vulcanization is studied. In this way a detailed and comprehensive picture of the polymer network as function of curing time is provided. Particularly Baum-Pines NMR pulse sequence allows the measurement of weak dipolar coupling constants in sulfur cured natural rubber, carbon black (N234) filled polyisoprene, polybutadiene and polyisoprene/polybutadiene blend networks. The network degradation has been studied by measuring the cross-link density as a function of curing time. Furthermore the five pulse MQ sequences have been applied for measuring relatively strong dipolar coupling constants in thermally cured cross-linked polybutylacrylate networks. The cross-link density and bound rubber fraction around the ionic domains in a shape memory polymer network - (carboxylated nitrile butyl rubber (XNBR) - have been obtained by the combination of Baum-Pines and 5 pulse MQ NMR sequences. The combined approach of Baum-Pines and 5 pulse MQ NMR gives cross-link density, allowing the estimation of bound rubber fraction as well. The measured bound rubber fraction has been further validated by magic sandwich echo NMR experiments, standard approach in this field. Finally the vulcanization curves and temperature dependent mechanical properties have been studied by rubber processing analyzer (RPA), using time-temperature superposition principle. Therefore this study allows proposing time domain-NMR as an inexpensive, fast and solvent-free (green) technique readily available for quality control and day to day R&D purposes.

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Urbańczyk, Mateusz, Wiktor Koźmiński et Krzysztof Kazimierczuk. « A combined sparse sampling of time-gradient domain for NMR diffusometry and relaxometry ». Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183971.

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Musgrave, Christopher S. A. « Development of high energy laser target materials : synthesis of low density porous polymers, and characterisation using time domain nuclear magnetic resonace ». Thesis, University of St Andrews, 2014. http://hdl.handle.net/10023/7074.

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This work details the synthesis of low density porous polymers, and characterisation with an emphasis on Time Domain Nuclear Magnetic Resonance (TD-NMR). High energy laser physics utilises low density porous polymers to study astrophysical phenomena at high pressures and temperatures in the form of plasma. Low Z, low density Polymerised High Internal Phase Emulsions (PolyHIPE) and aerogels form a large part of these capabilities, however increasingly stringent laser target parameters are now required to develop new capabilities. For low density porous polymers, this demands greater control over properties such as pore size, density, composition (C[sub]nH[sub](>n)) and homogeneity through novel synthesis and characterisation. Microstructure inhomogeneity of styrene-co-divinyl benzene (S-co-DVB) polyHIPEs in conjunction with novel t-butyl styrene and para divinyl benzene polyHIPEs were investigated using ¹H spin-lattice (T₁) and spin-lock (T[sub](1ρ)) NMR relaxation experiments using TD-NMR. The strong relationship between ¹H spin-lattice relaxation times and Dynmaic Mechanical Analysis (DMA) data, and application of relaxation experiments at varied temperatures reveal that structural inhomogeneity is based on poor emulsion stability and clustering of DVB polymer affecting bulk molecular motion. Divinyl benzene (DVB) aerogels and a range of innovative C[sub]nH[sub](>n) aerogels such as poly-5-vinyl-2-norbornene were synthesised using free-radical, cationic or ring opening metathesis polymerisation techniques. A one-step synthesis of homogeneous density gradient DVB aerogels was developed for the first time, which is fundamental to be able to study plasma shock fronts. Characterisation using X-ray tomography revealed the homogeneous density gradient. Successful carbonisation of dichloroparaxylene (DCPX) aerogels has similar properties to resorcinol-formaldehyde (RF) aerogels, but is produced in significantly less time and shrinkage, presents as a candidate for future laser experiments. Correlation between NMR relaxation times to established techniques of DMA and mercury porosimetry was explored to determine the suitability of TD-NMR in characterisation of low density porous polymers.

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Nie, Shouliang [Verfasser], et M. [Akademischer Betreuer] Wilhelm. « Aging of Natural Rubber Studied via Fourier-Transform Rheology and Time-Domain NMR / Shouliang Nie ; Betreuer : M. Wilhelm ». Karlsruhe : KIT-Bibliothek, 2020. http://d-nb.info/1214301509/34.

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Brizi, Leonardo <1986&gt. « Time Domain and Spatially Resolved NMR : Advanced Applications to Porous Media of Interest to Environmental Sustainability and Human Healthcare ». Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amsdottorato.unibo.it/7271/1/brizi_leonardo_tesi.pdf.

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Time-domain and spatially resolved NMR techniques developed in the field of Magnetic Resonance for fluids in Porous Media have been successfully applied to study various porous systems of different nature and origin, containing hydrogenous fluids. The unifying principle of this work is showing how the NMR analyses performed with these techniques can be extended to a multiplicity of porous material and how these methods are able to investigate the structure of the pore space and other features in a non-destructive manner, on the intact sample, from the macroscopic scale to the nanometric one. In particular, NMR relaxometry has been applied to the study of coral skeleton modifications due to Ocean Acidification. Skeletal porosity over length scales spanning from tens of nanometers to tens of micrometers was evaluated, giving precious information about the capability of coral to acclimate under adverse conditions. Another application of relaxometry was about the study of water compartmentalization for monitoring viability and water compartmentalization of cell populations kept under stress conditions. Parallel experiments performed by MRI and NMR single-sided techniques were executed in order to test the efficiency of protectives and consolidants applied for preserving and restore carbonate building materials of interest to Cultural Heritage. The study confirmed that quantitative MRI and NMR profiles are excellent tools for evaluating the performance of protective compounds. On the same samples the 2D NMR techniques were settled and implemented, showing the great potentiality in order to detect the pore space structure and in particular the surface-to-volume ratio, the tortuosity and the connectivity of the medium. The results of this thesis demonstrate that the same experimental NMR procedures can be successfully applied to perform researches in important topics that deal with the Sustainability of Environment and Human Healthcare.

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Keller, Jonas Sebastian [Verfasser], et M. [Akademischer Betreuer] Wilhelm. « Molecular relaxation of partially deuterated polyisoprene model melts studied by rheology and $^1\textH}$/$^2\textH}$ time domain NMR / Jonas Sebastian Keller ; Betreuer : M. Wilhelm ». Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1238148441/34.

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Ungarato, Rafael Fernando De Santi 1988. « Influência da molhabilidade de rochas na recuperação avançada de petróleo : um estudo por RMN ». [s.n.], 2013. http://repositorio.unicamp.br/jspui/handle/REPOSIP/250155.

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Orientador: Edvaldo Sabadini
Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Química
Made available in DSpace on 2018-08-22T20:35:03Z (GMT). No. of bitstreams: 1 Ungarato_RafaelFernandoDeSanti_M.pdf: 3937275 bytes, checksum: bb5e422a60e0f90e98a552f1ea02db61 (MD5) Previous issue date: 2013
Resumo: O estudo de soluções para métodos especiais de recuperação de petróleo vem sendo amplamente utilizado, principalmente devido à grande quantidade de óleo remanescente nos reservatórios após as recuperações primária e secundária. Soluções consideradas de potencial recuperador devem possuir algumas características específicas como uma baixa tensão interfacial água/óleo e viscosidade moderada, de modo a melhorar a eficiência do petróleo varrido. Interações fluidos-rocha e óleo-rocha são determinantes no montante de óleo a ser recuperado, assim sendo, estudos com relação à molhabilidade das superfícies das rochas mostram-se fundamentais. Um método de análise largamente empregado e considerado como padrão para medidas de molhabilidade é o teste de Amott, porém, tal método apresenta grande tempo de análise e preparo de amostra. O presente trabalho analisa a molhabilidade de rochas utilizando-se a técnica de Ressonância Magnética Nuclear de Baixo Campo. Ela se baseia nos tempos de relaxação da magnetização das populações de água e óleo, livres ou ligadas na superfície da rocha, permitindo de maneira rápida, a determinação da quantidade de óleo removida. Nesse estudo foram analisadas amostras de arenito e carbonato, caracterizando-as comparativamente com relação ao tamanho e homogeneidade dos poros por dados de RMN. As rochas foram impregnadas com petróleo e deixadas em contato com diferentes soluções de surfactantes (não iônico e zwiteriônico), sendo possível a análise quanto à diferença de molhabilidade entre as mesmas. Com relação a essas soluções, foram utilizados diversos surfactantes, com diferenças quanto aos grupos funcionais, ao tamanho da cadeia hidrofóbica, a presença de uma ou duas dessas cadeias e em diferentes concentrações, sendo possível a obtenção de informações relacionadas à eficiência de extração de óleo para cada uma delas. Observou-se que a técnica utilizada apresentou excelentes resultados, permitindo diferenciar a capacidade de extração para cada solução estudada
Abstract: The study of solutions to enhance oil recovery has been widely used, mainly due to large amount of oil that remains in reservoirs after primary and secondary recoveries. Solutions with good potential to recovery must have some specific characteristics such as low water/oil interfacial tension and a moderate viscosity to improve the efficiency of the oil swept. The fluid-rock and oil-rock interactions are of great importance concerning the total oil recovered. Therefore, studies involving wettability of rock surfaces are essential. A traditional method of analysis, which is considered as standard to measures the wettability is the Amott test, however, this method spends too much time and sample preparation. This study analyzes rock wettability using the technique of Low Field Nuclear Magnetic Resonance (low-field NMR). This is based on the relaxation rates of the magnetization of water and/or oil molecules, free or bounded at the surface of the pores of the rock. The technique allows a quick determination of the amount of oil removed. In the present study, the size and pores homogeneity of sandstone and carbonate were analyzed using low field-NMR. The rocks were impregnated with oil and then left in contact with different solutions of surfactants (non-ionic and zwitterionic), being possible to analyze the differences in wettability among them. Several concentrations of surfactants, in which differences in their: functional groups, hydrophobic chain length and number of chains, were studied. The NMR technique revealed excellent results, providing information related to the efficiency of oil extraction for each studied solution
Mestrado
Físico-Química
Mestre em Química

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CRISENZA, TOMMASO ULISSE FILIPPO. « Thermoplastic elastomers from chlorinated polyethylene/nylon terpolyamide blends ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2012. http://hdl.handle.net/10281/28398.

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Blends of chlorinated polyethylene (CPE) and Nylon terpolyamide (PA) were prepared with different ratios. It is generally known that CPE has intrinsic properties of heat, oil and oxidation resistance, so the obtained materials are well suitable in the hose, pipe and seal industry. CPE was strengthened by a 6,6-6,12 co-polyamide with the glass transition temperature slightly above room temperature and a particularly low melting temperature, that allowed to obtain the blends by typical industrial processes of mixing, milling and injection molding. Mechanical and rheological properties were investigated both with tensile tests and dynamic mechanical analysis: the results showed that CPE and PA form phase separated systems with excellent compatibility as the strength and modulus were improved. The thermal and mechanical behavior of the blends is that typical of thermoplastic elastomers. The comparison of the FTIR spectra of the blends in respect of linear combination of those of the component polymers allowed the detection of differences attributed to the existence of interactions at the interface responsible of the enhanced mechanical properties. These results were corroborated by time-domain proton NMR experiments, with an improved method for the measurement of the hard/soft ratio in phase separated systems. With the aim to resolve the morphology of the blends, samples were studied with laser scanning confocal fluorescent microscopy (LSCFM). CPE rubber was homogeneously labeled with a fluorescent dye by solution treatment and then blended with PA in order to increase the contrast between phases in fluorescent microscopy. Scanning Electron Microscopy and Atomic Force Microscopy techniques were used to confirm the data collected with LSCFM. A continuous and interpenetrating structure of the two phases is finally revealed for the blend with the best mechanical properties.Blends with co-continuous structures may combine the properties of both components in a favorable way. For example, a co-continuous structure leads to the maximum contribution of the mechanical modulus from each component simultaneously. Synergistic effects have also been shown in mechanical properties. Constituting a stable co-continuous morphology just mixing two polymers it is not that easy, and even more difficult is to detect such microstructure within the bulk of the material. For these two reasons, cocontinuous polymer blends are an interesting and challenging research topic. In addition, these co-continuous structures offer promising opportunities for improving properties and creating tailor-made materials. For these reason, and also as very few examples of Thermoplastic elastomers based on Chlorinated polyethylene and Nylon are present in the literature, the project for this thesis came to life. This work is aimed at the achievement of a material with thermoplastic elastomeric mechanical and processing properties, for which the structure properties relationships would be completely understood and explained as due to synergistic interfacial interaction between phases and cocontinuous morphology within them.

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Livres sur le sujet "Time domain NMR"

Sullivan, John. The University. Sous la direction de Frederick D. Aquino et Benjamin J. King. Oxford University Press, 2018. http://dx.doi.org/10.1093/oxfordhb/9780198718284.013.27.

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What significance might John Henry Newman have for the university in the twenty-first century? This chapter focuses on four major contributions from Newman. First, he offers a picture of the task that should be at the heart of higher education, the cultivation of intellect. Second, he challenges the modern university to allow for and to facilitate the power of teachers to exercise a beneficent personal influence on their students. Third, at a time when there is a renewed salience of religion in the public domain, his advocacy of the role of religious faith in the university presents a stream of thinking that has to be constructively examined and weighed carefully, inviting neither automatic rejection nor acceptance. Finally, in the face of a range of pressures that threaten the ethos of the university, he provides a strongly counter-cultural source of ideals.

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Johnson, Alice. Middle-Class Life in Victorian Belfast. Liverpool University Press, 2020. http://dx.doi.org/10.3828/liverpool/9781789620313.001.0001.

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This book reconstructs the social world of upper middle-class Belfast during the time of the city’s greatest growth, between the 1830s and the 1880s. Using extensive primary material including personal correspondence, memoirs, diaries and newspapers, the author draws a rich portrait of Belfast society and explores both the public and inner lives of Victorian bourgeois families. Leading business families like the Corrys and the Workmans, alongside their professional counterparts, dominated Victorian Belfast’s civic affairs, taking pride in their locale and investing their time and money in improving it. This social group displayed a strong work ethic, a business-oriented attitude and religious commitment, and its female members led active lives in the domains of family, church and philanthropy. While the Belfast bourgeoisie had parallels with other British urban elites, they inhabited a unique place and time: ‘Linenopolis’ was the only industrial city in Ireland, a city that was neither fully Irish nor fully British, and at the very time that its industry boomed, an unusually violent form of sectarianism emerged. Middle-Class Life in Victorian Belfast provides a fresh examination of familiar themes such as civic activism, working lives, philanthropy, associational culture, evangelicalism, recreation, marriage and family life, and represents a substantial and important contribution to Irish social history.

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Radu, Roxana. Negotiating Internet Governance. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198833079.001.0001.

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What is at stake for how the Internet continues to evolve is the preservation of its integrity as a single network. In practice, its governance is neither centralized nor unitary; it is piecemeal and fragmented, with authoritative decision-making coming from different sources simultaneously: governments, businesses, international organizations, technical and academic experts, and civil society. Historically, the conditions for their interaction were rarely defined beyond basic technical coordination, due at first to the academic freedom granted to the researchers developing the network and, later on, to the sheer impossibility of controlling mushrooming Internet initiatives. Today, the search for global norms and rules for the Internet continues, be it for cybersecurity or artificial intelligence, amid processes fostering the supremacy of national approaches or the vitality of a pluralist environment with various stakeholders represented. This book provides an incisive analysis of the emergence and evolution of global Internet governance, unpacking the complexity of more than 300 governance arrangements, influential debates, and political negotiations over four decades. Highly accessible, this book breaks new ground through a wide empirical exploration and a new conceptual approach to governance enactment in global issue domains. A tripartite framework is employed for revealing power dynamics, relying on: (a) an extensive database of mechanisms of governance for the Internet at the global and regional level; (b) an in-depth analysis of the evolution of actors and priorities over time; and (c) a key set of dominant practices observed in the Internet governance communities. It explains continuity and change in Internet-related negotiations, opening up new directions for thinking and acting in this field.

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Chapitres de livres sur le sujet "Time domain NMR"

Andrew, E. Raymond. « Time Domain NMR and Magic Angle Spinning ». Dans The Time Domain in Surface and Structural Dynamics, 31–48. Dordrecht : Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2929-6_4.

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Griffin, R. G., K. Beshah, R. Ebelhäuser, T. H. Huang, E. T. Olejniczak, D. M. Rice, D. J. Siminovitch et R. J. Wittebort. « Deuterium NMR Studies of Dynamics in Solids ». Dans The Time Domain in Surface and Structural Dynamics, 81–105. Dordrecht : Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-2929-6_7.

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Engelsen, Søren B., et Frans W. J. van den Berg. « Quantitative Analysis of Time Domain NMR Relaxation Data ». Dans Modern Magnetic Resonance, 1–19. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-28275-6_21-1.

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Engelsen, Søren B., et Frans W. J. van den Berg. « Quantitative Analysis of Time Domain NMR Relaxation Data ». Dans Modern Magnetic Resonance, 1669–86. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-28388-3_21.

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Guthausen, G., et A. Kamlowski. « Developments in Time Domain and Single Sided NMR ». Dans Magnetic Resonance in Food Science, 46–56. Cambridge : Royal Society of Chemistry, 2009. http://dx.doi.org/10.1039/9781847559494-00046.

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Beer, R., et D. Ormondt. « Analysis of NMR Data Using Time Domain Fitting Procedures ». Dans In-Vivo Magnetic Resonance Spectroscopy I : Probeheads and Radiofrequency Pulses Spectrum Analysis, 201–48. Berlin, Heidelberg : Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-45697-8_7.

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Kittler, Wilfred, Sergei Obruchkov, Mark Hunter et Petrik Galvosas. « Chapter 6. Real Time PGSE NMR Through Direct Acquisition of Averaged Propagators in the Time Domain Using Pulsed Second Order Magnetic Fields ». Dans New Developments in NMR, 194–225. Cambridge : Royal Society of Chemistry, 2016. http://dx.doi.org/10.1039/9781782623779-00194.

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Narbayev, Bakdauren, et Yerlan Amanbek. « Finite Element Model for Wind Comfort Around a Tall Building : A Case Study of Tower of Qazaqstan ». Dans Computational Science and Its Applications – ICCSA 2022 Workshops, 540–53. Cham : Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-10542-5_37.

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AbstractPedestrian wind comfort plays an essential role in the urban environment. In our work, we consider a model obtained using Computational Fluid Dynamics (CFD) around a tall building. Our focus is the Tower of Qazaqstan or Abu Dhabi Plaza in Nur-Sultan city (Kazakhstan), which will be the tallest building in Central Asia with a height of 310.8 m. We investigated the effect of the wind velocity on pedestrians by solving the incompressible time-dependent Navier-Stokes equations in the deal.II library by the Finite Element Method (FEM) using the projection method. We present numerical simulation results for various scenarios. It has been found that the velocity profile can vary in the domain that creates different pedestrian comfort conditions including the exceeded category at places dedicated to pedestrian walking.

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Schmidt-Rohr, K., et H. W. Spiess. « Time-Domain Signals for Multidimensional Spectra ». Dans Multidimensional Solid-State NMR and Polymers, 319–40. Elsevier, 1994. http://dx.doi.org/10.1016/b978-0-08-092562-2.50015-1.

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van Duynhoven, J., A. Voda, M. Witek et H. Van As. « Time-Domain NMR Applied to Food Products ». Dans Annual Reports on NMR Spectroscopy, 145–97. Elsevier, 2010. http://dx.doi.org/10.1016/s0066-4103(10)69003-5.

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Actes de conférences sur le sujet "Time domain NMR"

Bordakov, G. A., et D. F. Allen. « New Enhanced NMR Time Domain Inversion for Unconventionals ». Dans 78th EAGE Conference and Exhibition 2016. Netherlands : EAGE Publications BV, 2016. http://dx.doi.org/10.3997/2214-4609.201600895.

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Mueller-Petke, M., et U. Yaramanci. « Noise Cancellation for Surface NMR - Application of Time and Frequency Domain Approaches ». Dans Near Surface 2011 - 17th EAGE European Meeting of Environmental and Engineering Geophysics. Netherlands : EAGE Publications BV, 2011. http://dx.doi.org/10.3997/2214-4609.20144391.

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Mueller-Petke, M., et U. Yaramanci. « Noise Cancellation for Surface NMR - Derivation of Time and Frequency Domain Approaches ». Dans Near Surface 2011 - 17th EAGE European Meeting of Environmental and Engineering Geophysics. Netherlands : EAGE Publications BV, 2011. http://dx.doi.org/10.3997/2214-4609.20144446.

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Mueller‐Petke, Mike, et Ugur Yaramanci. « Noise Cancellation for Surface NMR : A Comparison of Time and Frequency Domain Approaches ». Dans Symposium on the Application of Geophysics to Engineering and Environmental Problems 2011. Environment and Engineering Geophysical Society, 2011. http://dx.doi.org/10.4133/1.3614229.

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Wiesman, Zeev, Charles Linder et Maliheh Esfahanian. « Time Domain (TD) NMR Proton (1H) Mobility Sensor to Assess Oil Quality and Oxidation ». Dans 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/gidy7667.

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The induction phase is the first step of oxidation, after which initiation phase occurs and is characterized by 1H abstraction and increasing peroxide levels. Later, the propagation cascade phase is generated with significant chemical and structural modification of the oil's fatty acids, causing increased concentrations of aldehydes. The process is terminated by the formation of toxic polymerization end products. A rapid and efficient analytical method of the different steps of oil oxidation are herein describe. Using a TD 1H NMR sensor capable of measuring proton mobility, it is possible to follow the segmental motion of the 1H population in each of the oil's segments, as well as describing the proton relaxation signals generated from the magnetic field that can measure and characterize important chemical and physical properties of the tested sample. In our research group's recent work, we demonstrated the ability to quantitatively measure the rates of self-diffusion (D) as well as ILT T1 and T2 spectral fingerprints of heated oils to correlate these values with chemical and morphological changes during oxidation. To simplify and reduce the time required for characterizing oil quality and oxidation using a TD 1H NMR sensor the present study focused on the relationship between D and the thermal and air conditions for enhancing oil oxidation. An excellent (R2>0.95) correlation of D with oil oxidation's conventional colorimeter standard tests (e.g., PV, p-Anisidine and TOTOX) was shown. These results were obtained from a high temperature (80°C) oxidation study of a list of saturated, monounsaturated and polyunsaturated edible oils (linseed, soy, olive, coconut, butter, respectively). The study clearly showed that self-diffusion D values, reflecting the mobility of 1H protons, is an accurate and rapid (< 1 minute) marker/indicator for the oil's quality with emphasis on the oils oxidation status, that be measured and used in the oil industry.

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Martin, Jacob, Austin Downey et Sang Hee Won. « Compact Time Domain NMR Design for the Determination of Hydrogen Content in Gas Turbine Fuels ». Dans 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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Inoue, Masahiro, et Tomohito Negishi. « Analysis of Molecular Heterogeneity and Interfacial Chemical Interactions in Electrically Conductive Adhesives using Time-domain NMR Spectroscopy ». Dans 2018 IEEE CPMT Symposium Japan (ICSJ). IEEE, 2018. http://dx.doi.org/10.1109/icsj.2018.8602630.

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Funk, James, Michael Myers et Lori Hathon. « Correlated Inversion of Complex Dielectric Dispersion and NMR Measurements in Conventional Carbonates ». Dans SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210006-ms.

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Abstract Combinations of dielectric and NMR measurements are frequently used to improve saturation modeling in complex situations, often incorporating the concept of wettability. Due to the two methods' distinct tools and physical mechanisms, the interplay of the electrical and magnetic fields and their constitutive equations are generally not addressed. This is directly counter to the situation with the medical imaging modalities, magnetic resonance electrical properties tomography (MREPT) and magnetic resonance electrical impedance tomography (MREIT), where field-specific polarizations and relaxations are used to enhance the contrast. Both electrical and magnetic (EM) fields at the frequencies typically encountered in laboratory and logging environments impart molecular motions impacted by pore structure. In both instances, restricted motions are reflected in their individual responses' time or frequency domain. Using time-domain relaxations and variations in both EM fields, this work focuses on the practicality of using NMR and dielectric relaxation comparisons originally proposed by Bloembergen, Purcell, and Pound (BPP). Similar to the dipolar relaxation equivalence in the BPP model, we develop a relaxation time correlation assuming representative Maxwell-Wagner relaxations for the key pore components demonstrated by Myers. The distributions of dielectric relaxation times evident in carbonate dispersion curves from 1 – 300 MHz were quantified using the Havriliak-Negami (HN) model. The quantifications are then used to evaluate characteristic dielectric dispersions curves generated from a dielectric model introducing multiple pore systems in carbonates. The modeled distributions are spectrally mapped to the NMR T2 distributions based on Debye shielding distances correlated with the conductivity. The interplay of pore connectivity and surface and bulk diffusivity are modeled using a "two-fraction fast exchange model" by Brownstein and Tarr. Using dielectric and NMR experiments along with a combination of micro-CT and SEM imaging techniques, the NMR-based spectral distribution of dielectric relaxation times demonstrates that variable-length scales and fractal dimensions accessed through the dielectric dispersion measurements are more extensive than that implied by the standard reference to the "texture" of a carbonate sample. We also show that the modeled distributions are closely correlated with the conductivity and provide improved petrophysical insight for the frequently used Archie exponent combination (MN) associated with the water tortuosity.

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Haji, Abdullah, Ahmed Fateh et Ahmed Abouzaid. « Advanced Pore and Rock Type Characterization Using NMR T2 Gamma Inversion in Carbonate Reservoirs ». Dans International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-22480-ea.

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Abstract Carbonate reservoir complexity imposes some challenges in formation evaluation and characterization. Grain, pore, and throat size distributions play major roles in rock typing to understand static and dynamic behaviors of carbonate reservoirs. Special core analysis techniques, such as MICP and digital core imaging, revealed that the presence of different types of pore structures can be classified based on sizes as micro, meso and macro pores. This paper explores a unique inversion technique using nuclear magnetic resonance (NMR) data to deliver fast, accurate, and continuous pore typing across logged intervals. The traditional NMR data processing technique consists of sequential steps that ultimately convert echoes from time domain into T2 domain using an exponential inversion, also known as Laplace transform. NMR-gamma inversion (NMR-GI) workflow is a mathematical approach to process the NMR data using probabilistic functions. The gamma inversion function has a form of a bell curve with the base in the logarithmic x-axis. Unlike exponential inversion technique, this inversion produces multiple components. Each component is located at a particular time and it is labeled with a specific number, which reflects the T2 time stamp of each component. The individual area under each component is translated into porosity units. The application of gamma inversion in a T2 spectrum results in subcomponents via deconvolution of the original spectrum. The display of the components makes it easy to visually analyze and interpret the porosimetry for pore size distribution and group the components for pore typing. A deeper look into the different components of the T2 spectrums enlarges the NMR measurement portfolio by displaying the porosimetry and pore size distribution. The inverted T2 results from both logging while drilling (LWD) and wireline tools in different fields are consistent with the reservoir geological and petrophysical models. The added value of this technique can be tangible for geophysical and geological (G&G) applications as well as completion design optimization. The NMR-GI technique can be further utilized and calibrated to improve reservoir understanding and optimize advanced core analysis by providing a quick continuous carbonate pore and rock type log.

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Räntzsch, Volker, Mürüvvet Begüm Özen, Karl-Friedrich Ratzsch, Gisela Guthausen et Manfred Wilhelm. « Low-field RheoNMR : Newly developed combination of rheology and time domain (TD)-NMR to correlate mechanical properties with molecular dynamics in polymer melts ». Dans PROCEEDINGS OF PPS-32 : The 32nd International Conference of the Polymer Processing Society - Conference Papers. Author(s), 2017. http://dx.doi.org/10.1063/1.5016756.

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Rapports d'organisations sur le sujet "Time domain NMR"

Sela, Shlomo, et Michael McClelland. Investigation of a new mechanism of desiccation-stress tolerance in Salmonella. United States Department of Agriculture, janvier 2013. http://dx.doi.org/10.32747/2013.7598155.bard.

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Low-moisture foods (LMF) are increasingly involved in foodborne illness. While bacteria cannot grow in LMF due to the low water content, pathogens such as Salmonella can still survive in dry foods and pose health risks to consumer. We recently found that Salmonella secretes a proteinaceous compound during desiccation, which we identified as OsmY, an osmotic stress response protein of 177 amino acids. To elucidate the role of OsmY in conferring tolerance against desiccation and other stresses in Salmonella entericaserovarTyphimurium (STm), our specific objectives were: (1) Characterize the involvement of OsmY in desiccation tolerance; (2) Perform structure-function analysis of OsmY; (3) Study OsmY expression under various growth- and environmental conditions of relevance to agriculture; (4) Examine the involvement of OsmY in response to other stresses of relevance to agriculture; and (5) Elucidate regulatory pathways involved in controlling osmY expression. We demonstrated that an osmY-mutant strain is impaired in both desiccation tolerance (DT) and in long-term persistence during cold storage (LTP). Genetic complementation and addition of a recombinantOsmY (rOsmY) restored the mutant survival back to that of the wild type (wt). To analyze the function of specific domains we have generated a recombinantOsmY (rOsmY) protein. A dose-response DT study showed that rOsmY has the highest protection at a concentration of 0.5 nM. This effect was protein- specific as a comparable amount of bovine serum albumin, an unrelated protein, had a three-time lower protection level. Further characterization of OsmY revealed that the protein has a surfactant activity and is involved in swarming motility. OsmY was shown to facilitate biofilm formation during dehydration but not during bacterial growth under optimal growth conditions. This finding suggests that expression and secretion of OsmY under stress conditions was potentially associated with facilitating biofilm production. OsmY contains two conserved BON domains. To better understand the role of the BON sites in OsmY-mediated dehydration tolerance, we have generated two additional rOsmY constructs, lacking either BON1 or BON2 sites. BON1-minus (but not BON2) protein has decreased dehydration tolerance compared to intact rOsmY, suggesting that BON1 is required for maximal OsmY-mediated activity. Addition of BON1-peptide at concentration below 0.4 µM did not affect STm survival. Interestingly, a toxic effect of BON1 peptide was observed in concentration as low as 0.4 µM. Higher concentrations resulted in complete abrogation of the rOsmY effect, supporting the notion that BON-mediated interaction is essential for rOsmY activity. We performed extensive analysis of RNA expression of STm undergoing desiccation after exponential and stationary growth, identifying all categories of genes that are differentially expressed during this process. We also performed massively in-parallel screening of all genes in which mutation caused changes in fitness during drying, identifying over 400 such genes, which are now undergoing confirmation. As expected OsmY is one of these genes. In conclusion, this is the first study to identify that OsmY protein secreted during dehydration contributes to desiccation tolerance in Salmonella by facilitating dehydration- mediated biofilm formation. Expression of OsmY also enhances swarming motility, apparently through its surfactant activity. The BON1 domain is required for full OsmY activity, demonstrating a potential intervention to reduce pathogen survival in food processing. Expression and fitness screens have begun to elucidate the processes of desiccation, with the potential to uncover additional specific targets for efforts to mitigate pathogen survival in desiccation.

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Morrison, Mark, Joshuah Miron, Edward A. Bayer et Raphael Lamed. Molecular Analysis of Cellulosome Organization in Ruminococcus Albus and Fibrobacter Intestinalis for Optimization of Fiber Digestibility in Ruminants. United States Department of Agriculture, mars 2004. http://dx.doi.org/10.32747/2004.7586475.bard.

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Improving plant cell wall (fiber) degradation remains one of the highest priority research goals for all ruminant enterprises dependent on forages, hay, silage, or other fibrous byproducts as energy sources, because it governs the provision of energy-yielding nutrients to the host animal. Although the predominant species of microbes responsible for ruminal fiber degradation are culturable, the enzymology and genetics underpinning the process are poorly defined. In that context, there were two broad objectives for this proposal. The first objective was to identify the key cellulosomal components in Ruminococcus albus and to characterize their structural features as well as regulation of their expression, in response to polysaccharides and (or) P AA/PPA. The second objective was to evaluate the similarities in the structure and architecture of cellulosomal components between R. albus and other ruminal and non-ruminal cellulolytic bacteria. The cooperation among the investigators resulted in the identification of two glycoside hydrolases rate-limiting to cellulose degradation by Ruminococcus albus (Cel48A and CeI9B) and our demonstration that these enzymes possess a novel modular architecture specific to this bacterium (Devillard et al. 2004). We have now shown that the novel X-domains in Cel48A and Cel9B represent a new type of carbohydrate binding module, and the enzymes are not part of a ceiluiosome-like complex (CBM37, Xu et al. 2004). Both Cel48A and Cel9B are conditionally expressed in response to P AA/PPA, explaining why cellulose degradation in this bacterium is affected by the availability of these compounds, but additional studies have shown for the first time that neither PAA nor PPA influence xylan degradation by R. albus (Reveneau et al. 2003). Additionally, the R. albus genome sequencing project, led by the PI. Morrison, has supported our identification of many dockerin containing proteins. However, the identification of gene(s) encoding a scaffoldin has been more elusive, and recombinant proteins encoding candidate cohesin modules are now being used in Israel to verify the existence of dockerin-cohesin interactions and cellulosome production by R. albus. The Israeli partners have also conducted virtually all of the studies specific to the second Objective of the proposal. Comparative blotting studies have been conducted using specific antibodies prepare against purified recombinant cohesins and X-domains, derived from cellulosomal scaffoldins of R. flavefaciens 17, a Clostridium thermocellum mutant-preabsorbed antibody preparation, or against CbpC (fimbrial protein) of R. albus 8. The data also suggest that additional cellulolytic bacteria including Fibrobacter succinogenes S85, F. intestinalis DR7 and Butyrivibrio fibrisolvens Dl may also employ cellulosomal modules similar to those of R. flavefaciens 17. Collectively, our work during the grant period has shown that R. albus and other ruminal bacteria employ several novel mechanisms for their adhesion to plant surfaces, and produce both cellulosomal and non-cellulosomal forms of glycoside hydrolases underpinning plant fiber degradation. These improvements in our mechanistic understanding of bacterial adhesion and enzyme regulation now offers the potential to: i) optimize ruminal and hindgut conditions by dietary additives to maximize fiber degradation (e.g. by the addition of select enzymes or PAA/PPA); ii) identify plant-borne influences on adhesion and fiber-degradation, which might be overcome (or improved) by conventional breeding or transgenic plant technologies and; iii) engineer or select microbes with improved adhesion capabilities, cellulosome assembly and fiber degradation. The potential benefits associated with this research proposal are likely to be realized in the medium term (5-10 years).

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Droogan, Julian, Lise Waldek, Brian Ballsun-Stanton et Jade Hutchinson. Mapping a Social Media Ecosystem : Outlinking on Gab & ; Twitter Amongst the Australian Far-right Milieu. RESOLVE Network, septembre 2022. http://dx.doi.org/10.37805/remve2022.6.

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Attention to the internet and the online spaces in which violent extremists interact and spread content has increased over the past decades. More recently, that attention has shifted from understanding how groups like the self-proclaimed Islamic State use the internet to spread propaganda to understanding the broader internet environment and, specifically, far-right violent extremist activities within it. This focus on how far right violent extremist—including far-right racially and ethnically motivated violent extremists (REMVEs) within them—create, use, and exploit the online networks in which they exist to promote their hateful ideology and reach has largely focused on North America and Europe. However, in recent years, examinations of those online dynamics elsewhere, including in Australia, is increasing. Far right movements have been active in Australia for decades. While these movements are not necessarily extremist nor violent, understanding how violent far right extremists and REMVEs interact within or seek to exploit these broader communities is important in further understanding the tactics, reach, and impact of REMVEs in Australia. This is particularly important in the online space access to broader networks of individuals and ideas is increasingly expanding. Adding to a steadily expanding body of knowledge examining online activities and networks of both broader far right as well as violent extremist far right populations in Australia, this paper presents a data-driven examination of the online ecosystems in which identified Australian far-right violent extremists exist and interact,1 as mapped by user generated uniform resource locators (URL), or ‘links’, to internet locations gathered from two online social platforms—Twitter and Gab. This link-based analysis has been used in previous studies of online extremism to map the platforms and content shared in online spaces and provide further detail on the online ecosystems in which extremists interact. Data incorporating the links was automatically collected from Twitter and Gab posts from users existing within the online milieu in which those identified far right extremists were connected. The data was collected over three discrete one-month periods spanning 2019, the year in which an Australian far right violent extremist carried out the Christchurch attack. Networks of links expanding out from the Twitter and Gab accounts were mapped in two ways to explore the extent and nature of the online ecosystems in which these identified far right Australian violent extremists are connected, including: To map the extent and nature of these ecosystems (e.g., the extent to which other online platforms are used and connected to one another), the project mapped where the most highly engaged links connect out to (i.e., website domain names), and To explore the nature of content being spread within those ecosystems, what sorts of content is found at the end of the most highly engaged links. The most highly engaged hashtags from across this time are also presented for additional thematic analysis. The mapping of links illustrated the interconnectedness of a social media ecosystem consisting of multiple platforms that were identified as having different purposes and functions. Importantly, no links to explicitly violent or illegal activity were identified among the top-most highly engaged sites. The paper discusses the implications of the findings in light of this for future policy, practice, and research focused on understanding the online ecosystems in which identified REMVE actors are connected and the types of thematic content shared and additional implications in light of the types of non-violent content shared within them.

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