Bibliografias temáticas / Distribution of relaxation time

Literatura científica selecionada sobre o tema "Distribution of relaxation time"

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Publicado: 20 de julho de 2024

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Artigos de revistas sobre o assunto "Distribution of relaxation time"

Stephanovich, V. A., M. D. Glinchuk e B. Hilczer. "Relaxation time distribution function". Ferroelectrics 240, n.º 1 (janeiro de 2000): 1495–505. http://dx.doi.org/10.1080/00150190008227975.

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Sudo, Seiichi, Naoki Shinyashiki, Yusuke Kitsuki e Shin Yagihara. "Dielectric Relaxation Time and Relaxation Time Distribution of Alcohol−Water Mixtures". Journal of Physical Chemistry A 106, n.º 3 (janeiro de 2002): 458–64. http://dx.doi.org/10.1021/jp013117y.

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Al-Refaie, S. N., e H. S. B. Elayyan. "The relaxation time distribution in dielectrics". Journal of Materials Science Letters 11, n.º 14 (1992): 988–90. http://dx.doi.org/10.1007/bf00729902.

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Tarasov, Andrey, e Konstantin Titov. "Relaxation time distribution from time domain induced polarization measurements". Geophysical Journal International 170, n.º 1 (julho de 2007): 31–43. http://dx.doi.org/10.1111/j.1365-246x.2007.03376.x.

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Kim, Bog-gi, Jong-Jean Kim, Do-Hyun Kim e Hyun M. Jang. "Relaxation time distribution of deuterated dipole glass". Ferroelectrics 240, n.º 1 (janeiro de 2000): 1515–22. http://dx.doi.org/10.1080/00150190008227977.

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Friedrich, Christian, Richard J. Loy e Robert S. Anderssen. "Relaxation time spectrum molecular weight distribution relationships". Rheologica Acta 48, n.º 2 (30 de outubro de 2008): 151–62. http://dx.doi.org/10.1007/s00397-008-0314-z.

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Magyari, Miklós, e János Liszi. "Determination of Relaxation Time Distribution in Dielectrics". Zeitschrift für Physikalische Chemie 187, Part_1 (janeiro de 1994): 85–92. http://dx.doi.org/10.1524/zpch.1994.187.part_1.085.

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Floudas, G., G. Fytas e I. Alig. "Brillouin scattering from bulk polybutadiene: distribution of relaxation times versus single relaxation time approach". Polymer 32, n.º 13 (janeiro de 1991): 2307–11. http://dx.doi.org/10.1016/0032-3861(91)90065-q.

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Nicolai, Taco, Jean Christophe Gimel e Robert Johnsen. "Analysis of Relaxation Functions Characterized by a Broad Monomodal Relaxation Time Distribution". Journal de Physique II 6, n.º 5 (maio de 1996): 697–711. http://dx.doi.org/10.1051/jp2:1996206.

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Vasquez, Alexis, Oscar Sotolongo e Francois Brouers. "Cluster Size Distribution and Relaxation Long Time Tails". Journal of the Physical Society of Japan 66, n.º 8 (15 de agosto de 1997): 2324–27. http://dx.doi.org/10.1143/jpsj.66.2324.

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Teses / dissertações sobre o assunto "Distribution of relaxation time"

Muggli, Mark W. "Physical Aging and Characterization of Engineering Thermoplastics and Thermoplastic Modified Epoxies". Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/40509.

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In this work the relationship between physical properties, such as physical aging and relaxation time distributions, and chemical structure for a variety of polymeric systems were investigated. Although there is a vast amount of physical aging data for polymers, most of these studies do not attempt to correlate structure with physical aging. Therefore, a set of engineering thermoplastics was examined with the goal of relating certain of their characteristic molecular dimensions to their mechanical and volumetric physical aging attributes.Another series of polymeric materials, based on a poly(ether sulfone) backbone, and having various endgroups differing in size, was also studied to determine physical aging rates and relaxation time distributions. Furthermore, it was concluded that the density of the poly(ether sulfones) increased while the glass transition temperature decreased as the endgroup became smaller.Thermoplastic toughened epoxies were also examined to clarify the importance of covalent bonds between toughener and epoxy on physical aging, relaxation time distributions and fracture toughness. In these studies the covalently bonded tougheners differed from their non-reactive counterparts in the rates of volumetric physical aging at high temperatures for the difunctional epoxy. The solvent resistance of the reactive thermoplastic toughened tetrafunctional epoxy was higher than the non-reactive thermoplastic toughened system. The tetrafunctional epoxies with the reactive toughener also had higher toughener glass transition temperatures.
Ph. D.

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Kwan, Kermit S. Jr. "The Role of Penetrant Structure on the Transport and Mechanical Properties of a Thermoset Adhesive". Diss., Virginia Tech, 1998. http://hdl.handle.net/10919/30666.

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In this work the relationships between penetrant structure, its transport properties, and its effects on the mechanical properties of a polymer matrix were investigated. Although there is a vast amount of data on the diffusion of low molecular weight molecules into polymeric materials and on the mechanical properties of various polymer-penetrant systems, no attempts have been made to inter-relate the two properties with respect to the chemical structure of the diffusant. Therefore, two series of penetrants - n-alkanes and esters - were examined in this context, with the goal of correlating molecular size, shape, and chemical nature of the penetrant to its final transport and matrix mechanical properties. These correlations have been demonstrated to allow quantitative prediction of one property, given a reasonable set of data on the other parameters. A series of n-alkanes (C6-C17) and esters (C5-C17) have been used to separate the effects of penetrant size and shape, from those due to polymer-penetrant interactions, in the diffusion through a polyamide polymeric adhesive. These effects have been taken into account in order to yield a qualitative relationship that allows for prediction of diffusivity based upon penetrant structural information. Transport properties have been analyzed using mass uptake experiments as well as an in-situ FTIR-ATR technique to provide detailed kinetic as well as thermodynamic information on this process. The phenomenon of diffusion and its effects on the resulting dynamic mechanical response of a matrix polymeric adhesive have been studied in great detail using the method of reduced variables. The concept of a diffusion-time shift factor (log aDt) has been introduced to create doubly-reduced master curves, taking into account the effects of temperature and the variations in the polymer mechanical response due to the existence of a low molecular weight penetrant.
Ph. D.

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El, Bassiri Fatima-Ezzahra. "Étude de la réaction de réduction de l'oxygène : application de la spectroscopie d'impédance à un système innovant dérivé de Ca3Co4O9+δ". Electronic Thesis or Diss., Centrale Lille Institut, 2024. http://www.theses.fr/2024CLIL0003.

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Dans le contexte de transition énergétique vers la neutralité carbone à l’horizon 2050, les piles à combustible à oxyde solide (Solid Oxide Fuel Cells, SOFC) et l’Electrolyse à Haute Température (EHT) présentent un réel potentiel d’utilisation via l’hydrogène comme vecteur d’énergie. L’objectif de cette thèse est la compréhension des processus électrochimiques dans ces systèmes dans l'objectif d'améliorer leurs performances et leur durabilité. La technique retenue est la spectroscopie d’impédance pour l'étude de la réaction de réduction de l'oxygène. Cette réaction est complexe et fait intervenir plusieurs étapes : la diffusion de l'oxygène moléculaire, la dissociation de l'oxygène moléculaire à la surface de l'électrode, la diffusion des atomes d'oxygène ou partiellement ionisés à la surface du solide ou leur incorporation dans le solide, le transfert de charges, la diffusion des ions dans le solide... Alors que la diffusion gazeuse est un processus lent, la diffusion ionique dans le solide est rapide. L'étude fine des spectres d'impédance mesurés sur des cellules symétriques permet de définir les étapes qui limitent la réaction et d’identifier les orientations à prendre pour optimiser les systèmes. Cela suppose la mesure de données fiables. Le test de Kramers-Krönig permet de vérifier la qualité des données. A partir de ces données, il est possible de calculer la fonction de distribution des temps de relaxation caractéristiques des phénomènes impliqués au sein de la cellule mais le nombre de données étant fini, la résolution de l'équation associée à cette fonction n'est pas simple. L'objectif de cette thèse a tout d'abord été de définir une méthodologie pour le traitement rigoureux des données des spectres d'impédance mesurés sur des cellules symétriques constituées d'un électrolyte de cérine dopé au gadolinium sur lequel a été déposé une électrode modèle à base de Ca3Co4O9+δ, un matériau d'électrode innovant, étudié depuis plusieurs années à l'UCCS. Contrairement aux matériaux de l'état de l'art, les cobaltites de calcium ont l'avantage de ne pas contenir de terres rares et surtout de présenter un coefficient de dilatation du même ordre de grandeur que celui des électrolytes utilisés pour ces applications, laissant espérer des durabilités accrues. D'abord utilisé comme électrode modèle, la substitution du calcium par du strontium dans ce composé et son utilisation en composite avec la cérine ont permis d'atteindre les spécificités requises pour l'application : une résistance surfacique spécifique inférieure ou égale à 0,15 Ω.cm² à 700°C. L'étude a ensuite été étendue à la caractérisation de cellules complètes. Cette thèse a bénéficié d'un financement Région Hauts de France, Centrale Lille. Une partie des travaux a été menée dans le cadre du projet MODTESTER, un projet Eurostars Eureka financé par la BPI, et porté par la société Fiaxell, une PME Suisse, et dans le cadre du projet européen NOUVEAU qui porte sur la recherche de nouveaux matériaux d'électrodes et d’interconnecteurs durables et réutilisables pour l'électrolyse de l'eau à haute température
In the context of energy transition towards carbon neutrality by 2050, Solid Oxide Fuel Cells (SOFCs) and Solid Oxide Electrolysis Cells (SOECs) offer real potential for use via hydrogen as an energy carrier. The aim of this thesis is to understand the electrochemical processes in these systems, with a view to improving their performance and durability. The technique chosen is impedance spectroscopy to study the oxygen reduction reaction. This is a complex reaction involving several stages: diffusion of molecular oxygen, dissociation of molecular oxygen at the electrode surface, diffusion of oxygen or partially ionized atoms at the solid surface or their incorporation into the solid, charge transfer, diffusion of ions into the solid, etc. Whereas gaseous diffusion is a slow process, ionic diffusion in solids is rapid. The detailed study of impedance spectra measured on symmetrical cells enables us to define the steps that limit the reaction and identify the directions to take to optimize the systems. This requires the measurement of reliable data. The Kramers-Krönig test is used to check the quality of the data. From these data, it is possible to calculate the distribution function of the relaxation times characteristic of the phenomena involved within the cell, but as the number of data is finite, solving the equation associated with this function is not straightforward. The aim of this thesis was first to define a methodology for the rigorous processing of impedance spectra measured on symmetrical cells consisting of a gadolinium-doped ceria electrolyte on which a model electrode based on Ca3Co4O9+δ, an innovative electrode material studied for several years at UCCS, has been deposited. Unlike state-of-the-art materials, calcium cobaltites have the advantage of not containing rare earths and, above all, of presenting an expansion coefficient of the same order of magnitude as that of the electrolytes used for these applications, giving rise to the hope of increased durability. Initially used as a model electrode, the substitution of strontium for calcium in this compound and its use as a composite with ceria enabled the specific features required for the application to be achieved: a specific surface resistance of less than or equal to 0.15 Ω.cm² at 700°C. The study was then extended to the characterization of complete cells. This thesis was funded by the Hauts de France Region and Centrale Lille. Part of the work was carried out as part of the MODTESTER project, a BPI-funded Eurostars Eureka project led by Fiaxell, a Swiss SME, and as part of the European NOUVEAU project, which focuses on the search for new, sustainable and reusable electrode and interconnector materials for high-temperature water electrolysis

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Valivarthi, Mohan Varma, e Hema Chandra Babu Muthyala. "A Finite Element Time Relaxation Method". Thesis, Högskolan i Halmstad, Sektionen för Informationsvetenskap, Data– och Elektroteknik (IDE), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-17728.

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In our project we discuss a finite element time-relaxation method for high Reynolds number flows. The key idea consists of using local projections on polynomials defined on macro element of each pair of two elements sharing a face. We give the formulation for the scalar convection–diffusion equation and a numerical illustration.

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Pan, Ke. "A Systematic Methodology for Characterization and Prediction of Performance of Si-based Materials for Li-ion Batteries". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1578038345015173.

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Jouravleva, Svetlana. "Dielectric relaxation time spectroscopy for tissue characterisation". Thesis, Oxford Brookes University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364927.

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Worsley, Richard Edward. "Time-resolved relaxation processes in quantum wells". Thesis, University of Southampton, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295867.

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Persson, Erold. "Multicast Time Distribution". Thesis, Linköping University, Department of Electrical Engineering, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-2274.

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The Swedish National Testing and Research Institute is maintaining the Swedish realization of the world time scale UTC, called UTC(SP). One area of research and development for The Swedish National Laboratory of Time and Frequency is time synchronization and how UTC(SP) can be distributed in Sweden. Dissemination of time information by SP is in Sweden mainly performed via Internet using the Network Time Protocol (NTP) as well as via a modem dial up service and a speaking clock (Fröken Ur). In addition to these services, time information from the Global Positioning System (GPS) and from the long-wave transmitter DCF77 in Germany, is also available in Sweden.

This master’s thesis considers how different available commercial communication systems could be used for multicast time distribution. DECT, Bluetooth, Mobile Telecommunication and Radio Broadcasting are different techniques that are investigated. One application of Radio Broadcasting, DARC, was found to be interesting for a more detailed study. A theoretical description of how DARC could be used for national time distribution is accomplished and a practical implementation of a test system is developed to evaluate the possibilities to use DARC for multicast time distribution.

The tests of DARC and the radio broadcast system showed that these could be interesting techniques to distribute time with an accuracy of a couple of milliseconds. This quality level is not obtained today but would be possible with some alterations of the system.

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KUMAR, VINAYAK. "ANALOG SIMULATION TIME REDUCTION BASED ON VARIABLE TOLERANCE RELAXATION". University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1163019325.

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Swaminathan, Bhargav Prasanna. "Gestion prévisionnelle des réseaux actifs de distribution - relaxation convexe sous incertitude". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAT039/document.

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Les réseaux électriques subissent deux changements majeurs : le taux croissant de générateurs d’énergie distribuée (GED) intermittents et la dérégulation du système électrique. Les réseaux de distribution et leurs gestionnaires (GRD) sont plus particulièrement touchés. La planification, construction et exploitation des réseaux de la plupart des GRD doivent évoluer face à ces change- ments. Les réseaux actifs de distribution et la gestion intelligente de associée est une solution potentielle. Les GRD pourront ainsi adopter de nouveaux rôles, interagir avec de nouveaux acteurs et proposer de nouveaux services. Ils pourront aussi utiliser la flexibilité de manière optimale au travers, entre autres, d’outils intelligents pour la gestion prévisionnelle de leurs réseaux de moyenne tension (HTA). Développer ces outils est un défi, car les réseaux de distribution ont des spécificités techniques. Ces spécificités sont la présence d’éléments discrets comme les régleurs en charge et la reconfiguration, les flexibilités exogènes, la non-linéarité des calculs de répartition de charge, et l’incertitude liée aux prévisions des GED intermittents. Dans cette thèse, une analyse économique des flexibilités permet d’établir une référence commune pour une utilisation rentable et sans biais dans la gestion prévisionnelle. Des modèles linéaires des flexibilités sont développés en utilisant des reformulations mathématiques exactes. Le calcul de répartition de charge est “convexifié” à travers des reformulations. L’optimalité globale des solutions obtenues, avec ce modèle d’optimisation exact et convexe de gestion prévisionnelle, sont ainsi garanties. Les tests sur deux réseaux permettent d’en valider la performance. L’incertitude des prévisions de GED peut pourtant remettre en cause les solutions obtenues. Afin de résoudre ce problème, trois formulations différentes pour traiter cette incertitude sont développées. Leurs performances sont testées et comparées à travers des simulations. Une analyse permet d’identifier les formulations les plus adaptées pour la gestion prévisionnelle sous incertitude
Power systems are faced by the rising shares of distributed renewable energy sources (DRES) and the deregulation of the electricity system. Distribution networks and their operators (DSO) are particularly at the front-line. The passive operational practives of many DSOs today have to evolve to overcome these challenges. Active Distribution Networks (ADN), and Active Network Management (ANM) have been touted as a potential solution. In this context, DSOs will streamline investment and operational decisions, creating a cost-effective framework of operations. They will evolve and take up new roles and optimally use flexibility to perform, for example, short-term op- erational planning of their networks. However, the development of such methods poses particular challenges. They are related to the presence of discrete elements (OLTCs and reconfiguration), the use of exogenous (external) flexibilities in these networks, the non-linear nature of optimal power flow (OPF) calculations, and uncertainties present in forecasts. The work leading to this thesis deals with and overcomes these challenges. First, a short-term economic analysis is done to ascertain the utilisation costs of flexibilities. This provides a common reference for different flexibilities. Then, exact linear flexibility models are developed using mathematical reformulation techniques. The OPF equations in operational planning are then convexified using reformulation techniques as well. The mixed-integer convex optimisation model thus developed, called the novel OP formulation, is exact and can guarantee globally optimal solutions. Simulations on two test networks allow us to evaluate the performance of this formulation. The uncertainty in DRES forecasts is then handled via three different formulations developed in this thesis. The best performing formulations under uncertainty are determined via comparison framework developed to test their performance

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Livros sobre o assunto "Distribution of relaxation time"

Pritchett, Lant. Divergence, big time. Washington, D.C: World Bank, Office of the Vice President, Development Economics, 1995.

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Fallick, Brucer. Part-time work and industry growth. Luxembourg: LIS, 1998.

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Bourlakis, Constantine A. The distribution of market power over time. Edinburgh: University of Edinburgh, Department of Business Studies, 1991.

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Jouravleva, Svetlana. Dielectric relaxation time spectroscopy for tissue characterisation. Oxford: Oxford Brookes University, 2001.

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Everall, Gavin, e Jane Rolo. Again, a time machine: From distribution to archive. [London]: Book Works, 2012.

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Tanaka, Katsuto. Time series analysis: Nonstationary and noninvertible distribution theory. New York: Wiley, 1996.

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R, Hammons Kevin, e Dryden Flight Research Facility, eds. Real-time flight test data distribution and display. Edwards, Calif: National Aeronautics and Space Administration, Ames Research Center, Dryden Flight Research Facility, 1988.

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Verdick, Elizabeth. Calm-down time. Minneapolis: Free Spirit Pub., 2010.

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Capítulos de livros sobre o assunto "Distribution of relaxation time"

Ardi, Eliani, Toshio Tsuchiya e Shogo Inagaki. "Force Distribution and Relaxation Time in Clusters of Galaxies". In Numerical Astrophysics, 81–82. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4780-4_28.

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Fytas, G. "Broad Distribution of Relaxation Times in Dense Homogeneous Diblock Copolymers". In Structure and Dynamics of Strongly Interacting Colloids and Supramolecular Aggregates in Solution, 777–84. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2540-6_40.

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Abramov, P. A., S. S. Zhukov, Z. V. Bedran, B. P. Gorshunov e Konstantim A. Motovilov. "Analysis of Melanin Properties in Radio-Frequency Range Based on Distribution of Relaxation Times". In IFMBE Proceedings, 515–21. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92328-0_66.

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Gooch, Jan W. "Relaxation Time". In Encyclopedic Dictionary of Polymers, 622. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_9902.

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Layton, William J., e Leo G. Rebholz. "Time Relaxation Truncates Scales". In Approximate Deconvolution Models of Turbulence, 99–120. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24409-4_5.

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Li, Lu-Ping, Bradley Hack, Erdmann Seeliger e Pottumarthi V. Prasad. "MRI Mapping of the Blood Oxygenation Sensitive Parameter T2* in the Kidney: Basic Concept". In Methods in Molecular Biology, 171–85. New York, NY: Springer US, 2021. http://dx.doi.org/10.1007/978-1-0716-0978-1_10.

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AbstractThe role of hypoxia in renal disease and injury has long been suggested but much work still remains, especially as it relates to human translation. Invasive pO2 probes are feasible in animal models but not for human use. In addition, they only provide localized measurements. Histological methods can identify hypoxic tissue and provide a spatial distribution, but are invasive and allow only one-time point. Blood oxygenation level dependent (BOLD) MRI is a noninvasive method that can monitor relative oxygen availability across the kidney. It is based on the inherent differences in magnetic properties of oxygenated vs. deoxygenated hemoglobin. Presence of deoxyhemoglobin enhances the spin–spin relaxation rate measured using a gradient echo sequence, known as R2* (= 1/T2*). While the key interest of BOLD MRI is in the application to humans, use in preclinical models is necessary primarily to validate the measurement against invasive methods, to better understand physiology and pathophysiology, and to evaluate novel interventions. Application of MRI acquisitions in preclinical settings involves several challenges both in terms of logistics and data acquisition. This section will introduce the concept of BOLD MRI and provide some illustrative applications. The following sections will discuss the technical issues associated with data acquisition and analysis.This chapter is based upon work from the COST Action PARENCHIMA, a community-driven network funded by the European Cooperation in Science and Technology (COST) program of the European Union, which aims to improve the reproducibility and standardization of renal MRI biomarkers. This introduction chapter is complemented by two separate chapters describing the experimental procedure and data analysis.

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Abrahamsson, M. "Time Based Distribution". In Quick Response in the Supply Chain, 151–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-59997-2_14.

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Cocozza-Thivent, Christiane. "Hitting Time Distribution". In Markov Renewal and Piecewise Deterministic Processes, 63–77. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-70447-6_4.

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Torsello, Andrea, e Marcello Pelillo. "Continuous-Time Relaxation Labeling Processes". In Lecture Notes in Computer Science, 253–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-48432-9_18.

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Mikhailov, Alexander S., e Alexander Yu Loskutov. "Extinction and Long-Time Relaxation". In Foundations of Synergetics II, 153–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-97294-2_11.

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Trabalhos de conferências sobre o assunto "Distribution of relaxation time"

Mao, D., e A. Revil. "Examining the Relaxation Time Distribution Determined from Time-Domain Induced Polarization Method". In 3rd Asia Pacific Meeting on Near Surface Geoscience & Engineering. European Association of Geoscientists & Engineers, 2020. http://dx.doi.org/10.3997/2214-4609.202071079.

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Shao, Wei, Songhua Chen, Gabor Hursan e Shouxiang Ma. "Temperature Dependence of NMR Relaxation Time in Carbonate Reservoirs". In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206184-ms.

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Abstract NMR-based carbonate interpretation models are commonly calibrated using laboratory ambient core NMR measurements. For applying the core calibrated models to downhole NMR logging interpretation, the difference between the NMR responses measured at ambient and reservoir conditions needs to be evaluated. The temperature dependence of NMR relaxation time in high-quality carbonate reservoirs was investigated, and NMR temperature dependence models were determined using data analytic methods (Hursan et al, 2019). This paper focuses on temperature dependence of NMR relaxation time in low-quality carbonate formations. For more than 95% of the samples investigated, NMR relaxation time shows a positive correlation with temperature. The correlation is similar to that observed in high-quality carbonate rocks but slightly less significant. Temperature dependent correlations for predicting T2GM from a measured temperature to any other temperature are derived from high- and low-quality carbonate rocks independently first, then a unified T2GM correlation is derived including both the high- and low-quality carbonate reservoirs. Predicting T2 distribution from one temperature to other temperatures is achieved using dimension reduction approach involving principal component analysis (PCA) technique. It is found that the T2 distributions at any given temperature for both the high- and low-quality carbonate reservoirs can be predicted robustly from the T2 distributions at the ambient temperature by representing the T2 distributions with principal components (PCs) at the ambient temperature then using these PCs to predict the PCs at a different temperature. The optimal number of PC components depends on the multimodality of the T2 distribution. This work extends the validity range of a data analytic method that quantifies the temperature dependence of carbonate NMR properties. The new NMR temperature model enables the integration of NMR laboratory studies and dowhole measurements for advanced petrophysical analyses in a wide range of carbonate reservoirs.

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Husan, Gabor, Shouxiang Ma, Wei Shao e Songhua Chen. "TEMPERATURE CORRECTION MODELS FOR NMR RELAXATION TIME DISTRIBUTION IN CARBONATE ROCKS". In 2019 SPWLA 60th Annual Symposium. Society of Petrophysicists and Well Log Analysts, 2019. http://dx.doi.org/10.30632/t60als-2019_hh.

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Choi, Yoon-Seock. "Relaxation time distribution function g(τ) of the dipole glass DRADP-x". In Fundamental physics of ferroelectrics 2000. AIP, 2000. http://dx.doi.org/10.1063/1.1324463.

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Kibushi, Risako, Tomoyuki Hatakeyama, Shinji Nakagawa e Masaru Ishizuka. "A Parametric Study of the Impact of Energy Relaxation Time on Thermal Behavior of Power Si MOSFET in Electro-Thermal Analysis". In ASME 2015 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems collocated with the ASME 2015 13th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ipack2015-48802.

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This paper describes the effect of variation of energy relaxation time on temperature distribution of power Si MOSFET in electro-thermal analysis. In previous our studies, thermal properties of power Si MOSFET are evaluated using electro-thermal analysis. However, in our previous calculation, energy relaxation time has been assumed to be constant at 0.3 ps, which is widely used value in electro-thermal analysis. This is because energy relaxation time cannot be calculated by classical physics, and it is difficult to detect exact energy relaxation time. However, energy relaxation time is important for evaluating heat generation in electro-thermal analysis. One method to obtain energy relaxation time is Monte Carlo simulation. In this research, we performed Monte-Carlo simulation, and electrical field and lattice temperature dependencies of energy relaxation time were evaluated. Then, we performed electro-thermal analysis of power Si MOSFET with various energy relaxation times, and the effect of change of energy relaxation time on temperature distribution of power Si MOSFET in electro-thermal analysis was discussed. Energy relaxation time in the range of 0.1–1000 kV/cm of electrical field was evaluated in Monte Carlo simulation. The results of Monte-Carlo simulation showed that maximum energy relaxation time becomes about 0.6 ps, and minimum energy relaxation time is about 0.30 ps. Following the results, to investigate the effect of variation of energy relaxation time on temperature distribution of power Si MOSFET, we changed energy relaxation time in electro-thermal analysis, and thermal properties of power Si MOSFET was calculated. The results of electro-thermal analysis showed that energy relaxation time has an effect on temperature distribution of power Si MOSFET. Therefore, accurate energy relaxation time should be considered in electro-thermal analysis for appropriate temperature distribution of power Si MOSFET.

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Netreba, A. V., S. P. Radchenko e M. O. Razdabara. "Correlation reconstructed spine and time relaxation spatial distribution of atomic systems in MRI". In 2014 IEEE 34th International Conference on Electronics and Nanotechnology (ELNANO). IEEE, 2014. http://dx.doi.org/10.1109/elnano.2014.6873453.

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Funk, James, Michael Myers e Lori Hathon. "Correlated Inversion of Complex Dielectric Dispersion and NMR Measurements in Conventional Carbonates". In 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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Jung, Min Jae, Young-Nam Lee, Juhyun Song, Sang-Gug Lee e Kyung-Sik Choi. "Experimental Analysis of Measurement Time Reduction in Electrochemical Impedance Spectroscopy using the Distribution of Relaxation Times". In 2023 IEEE Energy Conversion Congress and Exposition (ECCE). IEEE, 2023. http://dx.doi.org/10.1109/ecce53617.2023.10362663.

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Castro, Alonso, Dan Zhang e K. B. Eisenthal. "Dynamics of Molecular Rotation at the Air/Water Interface by Time-Resolved Second Harmonic Generation". In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/up.1992.thc30.

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To investigate orientational relaxation of molecules at the air/liquid interfaces we have used the technique of second harmonic generation as the probe. The idea of the experiment is to use a polarized picosecond pump pulse to preferentially excite molecules of a given orientation at the interface and thereby disturb the equilibrium orientational distribution. The relaxation of the perturbed distribution is monitored by the second harmonic signal generated by a time-delayed second laser pulse at the interface. Such surface second harmonic signal continues to change as the ground and excited molecules undergo rotation towards their equilibrium distributions and as the excited molecules relax back to the ground state.

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Sayyad, S. B., S. B. Kolhe, S. S. Dubal, P. B. Undre, K. N. Shivalkar, P. T. Sonwane, G. M. Dharne, S. S. Patil, P. W. Khirade e S. C. Mehrotra. "Dielectric relaxation study of binary mixtures having shielded charge distribution with exposed charge distribution using time domain reflectometry". In 2008 International Conference on Recent Advances in Microwave Theory and Applications (MICROWAVE). IEEE, 2008. http://dx.doi.org/10.1109/amta.2008.4763118.

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Relatórios de organizações sobre o assunto "Distribution of relaxation time"

Mikkelsen, D. R. Current relaxation time scales in toroidal plasmas. Office of Scientific and Technical Information (OSTI), fevereiro de 1987. http://dx.doi.org/10.2172/6678994.

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Rosenberg, M., e Nicholas A. Krall. Collisional Relaxation of Non-Maxwellian Plasma Distribution in a Polywell (Tradename). Fort Belvoir, VA: Defense Technical Information Center, junho de 1992. http://dx.doi.org/10.21236/ada257651.

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Douglass, M., e C. Daboo. Time Zone Data Distribution Service. RFC Editor, março de 2016. http://dx.doi.org/10.17487/rfc7808.

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Bush, Stephen. TIME-SENSITIVE QUANTUM KEY DISTRIBUTION. Office of Scientific and Technical Information (OSTI), dezembro de 2021. http://dx.doi.org/10.2172/1870109.

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Iyer, Ananth V., e H. D. Ratliff. Location Issues in Guaranteed Time Distribution Systems. Fort Belvoir, VA: Defense Technical Information Center, agosto de 1987. http://dx.doi.org/10.21236/ada200724.

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Banks, H. T., Sava Dediu e Hoan K. Nguyen. Time Delay Systems with Distribution Dependent Dynamics. Fort Belvoir, VA: Defense Technical Information Center, maio de 2006. http://dx.doi.org/10.21236/ada447038.

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Goldstein, Allen. Time distribution alternatives for the smart grid workshop report. Gaithersburg, MD: National Institute of Standards and Technology, novembro de 2017. http://dx.doi.org/10.6028/nist.sp.1500-12.

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Clayton, Steven Michael. Spin relaxation and linear-in-electric-field frequency shift in an arbitrary, time-independent magnetic field. Office of Scientific and Technical Information (OSTI), dezembro de 2010. http://dx.doi.org/10.2172/1043544.

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Achdou, Yves, Jiequn Han, Jean-Michel Lasry, Pierre-Louis Lions e Benjamin Moll. Income and Wealth Distribution in Macroeconomics: A Continuous-Time Approach. Cambridge, MA: National Bureau of Economic Research, agosto de 2017. http://dx.doi.org/10.3386/w23732.

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Broderick, Robert Joseph, Jimmy Edward Quiroz, Abraham Ellis, Matthew J. Reno, Jeff Smith e Roger Dugan. Time series power flow analysis for distribution connected PV generation. Office of Scientific and Technical Information (OSTI), janeiro de 2013. http://dx.doi.org/10.2172/1088099.

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