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Dissertations / Theses on the topic 'Relaxation time'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Valivarthi, Mohan Varma, and 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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2

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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3

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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4

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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5

Beyea, Steven Donald. "Magnetic resonance imaging (MRI) and relaxation time mapping of concrete." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ65451.pdf.

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6

Ye, Yufeng 1971. "The study of long time relaxation behavior of metallocene polyethylene /." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=31081.

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The long time relaxation behavior of linear and long chain branched (LCB) metallocene polyethylene (mPE) is very important for understanding their flow properties. One linear and four LCB mPEs were studied in shear creep and recovery measurements. All the mPEs have similar molecular weight and molecular weight distribution but different levels of long chain branching. A technique was developed to eliminate the effect of non-ideal start-up at the beginning of creep experiment and the small residual stress that exists during the creep recovery period. It is found that the existence of long chain

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7

Nordin, Adrian, and Simon Nylén. "Real-time Snow Simulator using Iterative-relaxation and Boundary Handling." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-21788.

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Background Physics-based snow simulation in real time is an unexplored area, the reason being the difficulty introduced by the multitude of factors that affect the snow behaviour, such as cohesion, thermodynamics, and compression. Simulating snow in real time when considering these factors can become computationally demanding. However, the continued advancement of graphics processing units makes the exploration of real-time snow simulation attractive. Recently published research on real time physics-based snow simulation shows promising results in a parallel solution and will serve as motivati

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8

Shiu, Kai Pong. "Study of relaxation time of mechanically aligned polystyrene thin films /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202003%20SHIU.

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9

Yamamoto, Takashi. "Studies on long time relaxation of multi-arm star polymers." 京都大学 (Kyoto University), 2003. http://hdl.handle.net/2433/148862.

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10

Doran, Simon John. "An exploration of the role of relaxometry in quantitative magnetic resonance imaging." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308229.

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11

Schumacher, Kimberly Lydia. "Femtosecond time-resolved intersubband relaxation measurements in GaAs/AlGaAs quantum wells." Thesis, University of Cambridge, 1995. https://www.repository.cam.ac.uk/handle/1810/270439.

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12

Pon, Carlos (Carlos Roberto) Carleton University Dissertation Engineering Electronics. "Time warping - waveform relaxation (TW - WR) in a distributed simulation environment." Ottawa, 1995.

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13

Parsaeian, Azita. "Fluctuations in the Relaxation of Structural Glasses." Ohio University / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1257449080.

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14

Chang, Yung-Yeh. "A Time-efficient Method for Accurate T1 Mapping of The Human Brain." VCU Scholars Compass, 2011. http://scholarscompass.vcu.edu/etd/2626.

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The signal resulting from the IR-FSE sequence has been thoroughly analyzed in order to improve the accuracy of quantitative T1 mapping of the human brain. Several optimized post-processing algorithms have been studied and compared in terms of their T1 mapping accuracy. The modified multipoint two-parameter fitting method was found to produce less underestimation compared to the traditional multipoint three-parameter fitting method, and therefore, to result in a smaller T1 estimation error. Two correction methods were proposed to reduce the underestimation problem which is commonly seen in IR-F

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15

Hayes, Gary Robert. "Ultrafast relaxation processes in semiconductors studied by femtosecond time-resolved photoluminescence spectroscopy." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263051.

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16

Zybell, Sabine. "Relaxation dynamics in photoexcited semiconductor quantum wells studied by time-resolved photoluminiscence." Helmholtz-Zentrum Dresden - Rossendorf, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-197703.

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Gegenstand der vorliegenden Arbeit ist die Untersuchung der Photolumineszenzdynamik von Halbleiter-Quantentöpfen (Quantum Wells), die durch Anregung von Intraband-Übergängen mittels resonanter Laserpulse im mittleren Infrarot- und Terahertz-Spektralbereich verändert wird. Diese Zweifarbenexperimente wurden mit Hilfe eines optischen Aufbaus für zeitaufgelöste Photolumineszenzspektroskopie am Großgerät Freie-Elektronen Laser FELBE am Helmholtz-Zentrum Dresden-Rossendorf realisiert. Zeitlich verzögert zur gepulsten optischen Anregung über die Bandlücke wurden Intersubband- oder Intraexziton-Überg

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17

Zybell, Sabine. "Relaxation dynamics in photoexcited semiconductor quantum wells studied by time-resolved photoluminiscence." Helmholtz-Zentrum Dresden - Rossendorf, 2015. https://hzdr.qucosa.de/id/qucosa%3A22319.

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Gegenstand der vorliegenden Arbeit ist die Untersuchung der Photolumineszenzdynamik von Halbleiter-Quantentöpfen (Quantum Wells), die durch Anregung von Intraband-Übergängen mittels resonanter Laserpulse im mittleren Infrarot- und Terahertz-Spektralbereich verändert wird. Diese Zweifarbenexperimente wurden mit Hilfe eines optischen Aufbaus für zeitaufgelöste Photolumineszenzspektroskopie am Großgerät Freie-Elektronen Laser FELBE am Helmholtz-Zentrum Dresden-Rossendorf realisiert. Zeitlich verzögert zur gepulsten optischen Anregung über die Bandlücke wurden Intersubband- oder Intraexziton-Überg

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18

Zybell, Sabine. "Relaxation dynamics in photoexcited semiconductor quantum wells studied by time-resolved photoluminescence." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-187690.

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Gegenstand der vorliegenden Arbeit ist die Untersuchung der Photoluminenzenzdynamik von Halbleiter-Quantentöpfen (Quantum Wells), die durch Anregung von Intraband-Übergängen mittels resonanter Laserpulse im mittleren Infrarot- und Terahertz-Spektralbereich verändert wird. Diese Zweifarbenexperimente wurden mit Hilfe eines optischen Aufbaus für zeitaufgelöste Photolumineszenzspektroskopie am Großgerät Freie-Elektronen Laser FELBE am Helmholtz-Zentrum Dresden-Rossendorf realisiert. Zeitlich verzögert zur gepulsten optischen Anregung über die Bandlücke wurden Intersubband- oder Intraexziton-Überg

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19

Phillips, Paul Stewart. "Magnetic resonance line-shape and relaxation time studies of rotational diffusion in liquids." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25956.

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A new numerical analysis method, dispersion vs. absorption plots (DISPA), has been developed for ESR. This method may be used for semi-quantitative line-shape studies and is useful both as a diagnostic and analytical tool. In addition it provides a method of automatic phasing for magnetic resonance spectra. Numerous examples of its applications, both simulated and experimental are presented, with emphasis on spin-probe studies. The digital acquisition and processing methods used for these studies are also briefly discussed. ESR and NMR relaxation time studies of the bis(dialkyl-N-carbodithioa

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20

Turo, Diego. "A relaxation approach for time domain modelling of sound propagation in porous media." Thesis, University of Salford, 2011. http://usir.salford.ac.uk/26948/.

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In the present study a relaxation approach to modelling sound propagation in porous media has been developed. A frequency domain model has been formulated and is shown to allow an analytical transformation of the governing equations in the time domain. The model proposed is an extension of an earlier work by Wilson at al. (1997) and is based on the use of two relaxation times. The model presented requires a set of six measurable parameters, e.g. static flow resistivity, porosity, tortuosity, thermal permeability, viscous and thermal characteristic lengths. It will be shown that the model satis

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21

Tan, Xin. "Molecular reorientational relaxation and excited state dynamics probed by time-resolved fluorescence spectroscopy /." The Ohio State University, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486474078049178.

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22

Pandit, Rajib K. "Local Fluctuations in the Relaxation Rate in Glassy Systems." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1542389277929449.

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23

Sabesan, Vaidhyanathan. "Detection and Frequency Estimation of Nonlinear Systems using Step Relaxation Technique." University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1505203318448279.

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24

Mavimbela, Gcina A. "Time Reparametrization Symmetry and Spatial-Temporal Fluctuations in Glasses." Ohio University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1354211400.

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25

Huen, Isaac Kwong-Ping. "Assessment of placental and fetal oxygenation in normal and abnormal pregnancy using magnetic resonance imaging." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/assessment-of-placental-and-fetal-oxygenation-in-normal-and-abnormal-pregnancy-using-magnetic-resonance-imaging(8cd3f9a2-22cb-4c95-bee3-06b5c4bfc2d2).html.

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Fetal growth restriction (FGR) is a common pregnancy complication resulting in increased neonatal mortality and morbidity. The aetiology of fetal growth restriction is not fully understood, but abnormalities in placental development are, leading to abnormalities in placental structure which are thought to affect supply of oxygen to the fetus. The source of fetal hypoxia is unknown due to the difficulty in obtaining oxygenation data in the context of pregnancy using existing techniques. There is also an absence of data relating to oxygenation in FGR pregnancies. Oxygen-Enhanced MRI (OE-MRI) and

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26

Shah, Falak Dipak. "Time-dependent behavior of pretensioned stainless steel bars used for structural rehabilitation and retrofitting." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/53063.

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The objective of this study is to characterize the long-term behavior of an austenitic-ferritic stainless steel-based pretensioned system for strengthening reinforced concrete bridge pier caps in shear. Stress relaxation experiments were conducted on UNS S32101 stainless steel bars subjected to various initial stresses and temperatures within the low homologous temperature (LHT) regime. Data from these experiments were used to develop a viscoplastic constitutive model to describe the long-term time- and temperature-dependent behavior of the stainless steel bars. This mechanics-based approach i

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27

Gilbert, Valérie. "The effect of time-scale truncation and data errors on the linear relaxation spectrum." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1995. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/MQ37298.pdf.

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28

Dunn, DeRome Osmond. "Modeling cycle and time dependent creep/relaxation effects on fatigue lives of notched members." Diss., Virginia Polytechnic Institute and State University, 1991. http://hdl.handle.net/10919/54823.

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Mechanical cyclic variations in mean stress and strain amplitude is a well-known occurrence for metals even at room temperature. Many fatigue analysis procedures ignore these variations. Fatigue analysis which included both time and cycle dependent mechanical material behavior for metals at room temperature had not been previously studied except for the case of creep. An investigation studying transient mechanical effects on Ti-6Al-4V titanium and 7475-T651 Al alloys was done to determine how great an effect transients at room temperature would have on fatigue life under cyclic conditions. The

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29

Okubo, Gosuke. "The relationship between Aging and T1 relaxation time in deep gray matter: A voxel-based analysis." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225482.

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30

Goulkhah, Mohammad (Monty). "Waveform relaxation based hardware-in-the-loop simulation." Cigre Canada, 2014. http://hdl.handle.net/1993/31012.

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This thesis introduces an alternative potentially low cost solution for hardware-in-the-loop (HIL) simulation based on the waveform relaxation (WR) method. The WR tech-nique is extended so that, without the need for a real-time simulator, the behaviour of an actual piece of physical hardware can nevertheless be tested as though it were connected to a large external electrical network. This is achieved by simulating the external network on an off-line electromagnetic transients (EMT) simulation program, and utilizing iterative exchange of waveforms between the simulation and the hardware by mea

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31

Loskutov, Valentin. "Dependence of the relaxation time T 2 on a fluid flow velocity in a porous media." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183839.

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32

Loskutov, Valentin. "Dependence of the relaxation time T 2 on a fluid flow velocity in a porous media." Diffusion fundamentels 20 (2013) 94, S. 1-2, 2013. https://ul.qucosa.de/id/qucosa%3A13683.

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33

Bezant, Christopher David. "Application of THz pulses in semiconductor relaxation and biomedical imaging studies." Thesis, University of Nottingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325712.

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34

Iglesias, Oscar. "Time Dependent Processes in Magnetic Systems." Doctoral thesis, Universitat de Barcelona, 2002. http://hdl.handle.net/10803/662613.

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En este trabajo se presentan modelos para el estudio de los procesos de dependencia en el tiempo de las propiedades magnéticas de diferentes tipos de materiales magnéticos, básicamente sistemas de partículas pequeñas y capas delgadas con aplicación en el campo del almacenamiento magnético. A lo largo del mismo se han estudiado las distintas problemáticas asociadas al creciente aumento de la densidad de grabación en soportes magnéticos. En primer lugar se han considerado los efectos de tamaño finito y de superficie asociados a la reducción del tamaño de las partículas magnéticas a través de si

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35

Delsaute, Brice. "New approach for Monitoring and Modeling of the Creep and Shrinkage behaviour of Cement Pastes, Mortars and Concretes since Setting Time." Thesis, Paris Est, 2016. http://www.theses.fr/2016PESC1104/document.

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Lors de la construction de structure réalisée en plusieurs phases de bétonnage, les déformations du béton sont restreintes durant son durcissement. Quand le retrait est restreint, des contraintes de traction sont induites dans le matériau et un risque de fissuration est présent. Il est alors nécessaire de modéliser l’évolution des propriétés au jeune âge afin de prédire le comportement de la structure durant le jeune âge du béton. La difficulté réside dans le fait que la modélisation des propriétés du béton doit être basée sur des données expérimentales au jeune âge et que ces données doivent

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36

Shahabi, Sagedeh Sadat. "Non-invasive Monitoring of Degradation of Poly (lactide-co-glycolide) Hollow Fiber Channel for Recovery of Spinal Cord Injury Using Magnetic Resonance Imaging." Thesis, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23566.

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Spinal cord injury (SCI) leads to axonal damage and limits the ability of the brain to communicate with the rest of the body. Several bioengineered approaches have been developed for the recovery of SCI. Among these techniques, degradable guidance tubes have shown promising results. However, design of nerve guide tubes requires several design considerations and has been a significant challenge. To assess the efficacy of a prototypical implanted nerve guide tubes, it is essential to perform continuous monitoring. In this respect, magnetic resonance imaging (MRI) is one of the most reliable ima

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37

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

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38

Koirala, Sandhaya. "Localization dynamics of paraexcitons and their lattice relaxation at oxygen vacancies in cuprous oxide." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/189651.

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39

Jullian, Christelle Francoise. "Investigation of polarization switching over broad time and field domains in various ferroelectrics." Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/9853.

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Investigations of polarization switching over broad time and electric field domains, in various modified Pb-based perovskite ferroelectrics, were systematically performed by ferroelectric switching current transient and bipolar drive P-E responses. Studies were performed from E«Ec to E»Ec, where Ec is the coercive field These investigations have shown the presence of broad relaxation time distributions for the switching process, which can extend over several decades in order of magnitude in time, and where the distribution is strongly dependent on the applied electric field. By performing th

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40

Kubach, Miriam Rabea [Verfasser]. "Quantification of the longitudinal relaxation time for in vivo MRI : influence of magnetisation transfer / Miriam Rabea Kubach." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1025884574/34.

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41

Harvey, Pierre Dominique. "Applications of vibrational spectroscopy and NMR spin-lattice relaxation time measurements to organometallic and organic molecular crystals." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=73986.

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42

Carlin, Dominic Alexander. "An investigation into the importance of T2 relaxation and echo time choice for accurate metabolite biomarker quantification." Thesis, University of Birmingham, 2017. http://etheses.bham.ac.uk//id/eprint/7194/.

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Metabolite concentrations are fundamental biomarkers of disease. With increasing interest in personalised medicine, this work assessed the accuracy of non-invasive metabolite quantification with magnetic resonance spectroscopy (MRS) using a combination of simulations, phantom and in vivo data. No optimal echo time (TE) was found for measuring a range of key metabolites with quantification accuracy generally influenced more by data quality than TE choice. The T2 relaxation times of water and metabolites with MRS dominated by a singlet could be estimated using 2 TEs and were found to be signific

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43

Chen, Ping-Shun. "Cost minimization in multi−commodity multi−mode generalized networks with time windows." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4779.

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The purpose of this research is to develop a heuristic algorithm to minimize total costs in multi-commodity, multi-mode generalized networks with time windows problems. The proposed mathematical model incorporates features of the congestion of vehicle flows and time restriction of delivering commodities. The heuristic algorithm, HA, has two phases. Phase 1 provides lower and upper bounds based on Lagrangian relaxations with subgradient methods. Phase 2 applies two methods, early due date with overdue-date costs and total transportation costs, to search for an improved upper bound. Two applicat

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44

Hannila, I. (Ilkka). "T2 relaxation of articular cartilage:normal variation, repeatability and detection of patellar cartilage lesions." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526212043.

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Abstract Cartilage-related diseases such as osteoarthritis (OA) are a major cause of disability and decrease in the quality of life. Moreover OA causes a heavy economical burden on the social welfare and health care systems. Conventional magnetic resonance imaging (MRI) provides accurate noninvasive method of morphological evaluation of the articular cartilage. However, there are early degenerative changes in the articular cartilage that can be evaluated with modern quantitative MRI methods prior to the signs of cartilage loss. In this study, T2 relaxation time of the articular cartilage was f

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45

Galbraith, Martin Christopher Edward [Verfasser]. "Time-resolved spectroscopy with attosecond pulses and pulse trains: ultrafast relaxation in benzene cations / Martin Christopher Edward Galbraith." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1124465170/34.

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46

Glancy, Paul Michael. "Terahertz time domain spectroscopy (THz-TDS) of hydrated biomolecular polymers and monomers." Diss., UC access only, 2009. http://proquest.umi.com/pqdweb?index=153&did=1906549291&SrchMode=1&sid=1&Fmt=7&retrieveGroup=0&VType=PQD&VInst=PROD&RQT=309&VName=PQD&TS=1270496277&clientId=48051.

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Thesis (Ph. D.)--University of California, Riverside, 2009.<br>Vita. Includes abstract. Includes bibliographical references (leaves 148-155). Issued in print and online. Available via ProQuest Digital Dissertations.

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Raya, García del Olmo José María. "Voxel-based assessment of disease progression in articular cartilage with MRI follow-up examinations of the T2 relaxation time." Diss., lmu, 2009. http://nbn-resolving.de/urn:nbn:de:bvb:19-108411.

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48

Lau, Wai-ping, and 劉偉平. "Minimising the calculation time of the cluster program by choosing theminimum convergent cluster size and the best relaxation factor." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1999. http://hub.hku.hk/bib/B29760392.

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49

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

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50

KHARCHEVA, Anna. "Anomalous diffusion and nonlinear relaxation phenomena in stochastic models of interdisciplinary physics." Doctoral thesis, Università degli Studi di Palermo, 2020. http://hdl.handle.net/10447/430665.

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The study of nonlinear dynamical systems in the presence of both Gaussian and non-Gaussian noise sources is the topic of this research work. In particular, after shortly present new theoretical results for statistical characteristics in the framework of Markovian theory, we analyse four different physical systems in the presence of Levy noise source. (a) The residence time problem of a particle subject to a non-Gaussian noise source in arbitrary potential profile was analyzed and the exact analytical results for the statistical characteristics of the residence time for anomalous diffusion in t

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