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Dissertations / Theses on the topic 'Diffusion techniques'

Author: Grafiati

Published: 11 March 2023

Last updated: 31 July 2025

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1

Witwit, Abdul-Mehdi Rahim Mohammed. "Meshing techniques for TLM diffusion problems." Thesis, University of Hull, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296281.

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2

Williams, Catherine F. M. "Diffusion-weighted magnetic resonance imaging techniques." Thesis, University of Aberdeen, 1998. http://digitool.abdn.ac.uk/R?func=search-advanced-go&find_code1=WSN&request1=AAIU602003.

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The aim of this project was to compare and evaluate other, non-EPI, diffusion-weighted MRI (DWI) sequences, through imaging experiments, on a phantom and in vivo, (using a 0.95 T system) and computer simulations, and to develop improved DWI methodology which could be implemented on standard hardware. Pulsed gradient spin echo (PGSE) and diffusion-weighted STEAM are slow multiple shot sequences, with measurement times of several minutes. Both sequences are highly sensitive to patient motion, but motion artifact was virtually eliminated using navigator echo phase correction and EGG triggering wh

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3

Sekerci, Yadigar. "Some recent simulation techniques of diffusion bridge." Thesis, Växjö University, School of Mathematics and Systems Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:vxu:diva-5749.

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<p>We apply some recent numerical solutions to diffusion bridges written in Iacus (2008). One is an approximate scheme from Bladt and S{\o}rensen (2007), another one, from Beskos et al (2006), is an algorithm which is exact: no numerical error at given grid points!</p>

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4

Rogerson, Alexandria. "New techniques in diffusion-ordered NMR spectroscopy." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/new-techniques-in-diffusionordered-nmr-spectroscopy(aa3eaee0-984b-4434-b460-8c3118a7c3b2).html.

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The analysis of mixtures is a subject that spans several different analytical techniques. In NMR, a powerful technique for this analysis is Diffusion-Ordered NMR Spectroscopy (DOSY), in which signals from different chemical species can be distinguished by their different diffusion coefficients. DOSY NMR allows an analysis of mixture components and their interactions in a non-invasive way and is proving to be an accurate and time effective method for looking at mixtures.An in-depth analysis of DOSY NMR is presented using the commercial mixture “monoacetin”. The chemically cognate species in thi

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5

Clement, Meagan E. Couper David J. "Analysis techniques for diffusion tensor imaging data." Chapel Hill, N.C. : University of North Carolina at Chapel Hill, 2008. http://dc.lib.unc.edu/u?/etd,2010.

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Thesis (DrPH)--University of North Carolina at Chapel Hill, 2008.<br>Title from electronic title page (viewed Feb. 17, 2009). "... in partial fulfillment of the requirements for the degree of Doctorate of Public Health in the School of Public Health Department of Biostatistics." Discipline: Biostatistics; Department/School: Public Health.

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6

Mueller, Katherine Elisabeth. "Diffusion in polymers using quartz crystal microbalance techniques /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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7

Ferguson, R. C. "Numerical techniques for the drift-diffusion semiconductor equations." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362239.

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8

Bushby, Roger Stanley. "Joining aluminium-based composites using diffusion bonding techniques." Thesis, University of Bath, 1993. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.331934.

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9

Ismail, Furrukh. "Photovoltaic Process Development and innovative Techniques." Thesis, Högskolan Dalarna, Elektroteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:du-6453.

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Photovoltaic processing is one of the processes that have significance in semiconductor process line. It is complicated due to the no. of elements involved that directly or indirectly affect the processing and final yield. So mathematically or empirically we can’t say assertively about the results specially related with diffusion, antireflective coating and impurity poisoning. Here I have experimented and collected data on the mono-crystal silicon wafers with varying properties and outputs. Then by using neural network with available experimental data output required can be estimated which is

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10

Symeonidis, Kimon. "The Controlled Diffusion Solidification Process: Fundamentals and Principles." Worcester, Mass. : Worcester Polytechnic Institute, 2009. http://www.wpi.edu/Pubs/ETD/Available/etd-042909-102711/.

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11

Heinke, Lars, Despina Tzoulaki, Christian Chmelik, Florian Hibbe, and Jörg Kärger. "Assessing details of molecular motion in nanopores by combining different microscopic techniques." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-189565.

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12

Nguyen, Quyen. "Quantitative diffusion weighted imaging : techniques and applications to perinatal asphyxia." Thesis, University College London (University of London), 2001. http://discovery.ucl.ac.uk/1382401/.

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This thesis describes the results of a study to investigate early cerebral changes in a piglet model of perinatal asphyxia using quantitative diffusion-weighted imaging (DWI) and subsequent work to develop a robust DWI technique to enable similar studies to be performed in neonates. 31Phophorus magnetic resonance spectroscopy and quantitative diffusion and T2 imaging of the cerebrum were performed in a piglet model of perinatal asphyxia. A significant decline in the ratio of phosphocreatine to inorganic phosphate concentrations ([PCr]/[Pi]) was observed during the 48 hours following the transi

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13

Brihuega-Moreno, Oscar. "Development and optimisation of diffusion MRI techniques for articular cartilage." Thesis, University of Cambridge, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614690.

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14

Gopinathan, Navin. "Development of catalyst characterisation techniques." Thesis, University of Bath, 2013. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.571865.

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Standard catalyst characterisation techniques such as gas adsorption porosimetry and mercury porosimetry only account for some of the physical heterogeneity of the catalyst surface. They completely ignore the chemical heterogeneity present and in most cases consider pores present in the medium to be independent of each other. Thus, most results of characterisation (pore space descriptors such as BET surface area, BJH pore size distribution, mercury porosimetry surface area, etc.) are not accurate. This has been a major issue that remains to be resolved during the characterisation of fresh and

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15

Helander, Thomas. "Some applications of CALPHAD techniques to diffusion reactions in gradient materials." Doctoral thesis, Stockholm : Tekniska högsk, 1999. http://www.lib.kth.se/abs99/hela0604.pdf.

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16

Cheung, Man-hin Matthrew, and 張文騫. "Development of diffusion and functional magnetic resonance imaging techniques for neuroscience." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47147635.

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17

Bachmann, Sebastian. "Estimating Molecular Weights of Organometallics in Solution with Diffusion NMR Techniques." Doctoral thesis, Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://hdl.handle.net/11858/00-1735-0000-0023-3DF9-7.

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18

Morgan, Stephen P. "Continuous wave optical techniques for imaging through scattering media." Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319966.

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19

Heinke, Lars, Despina Tzoulaki, Christian Chmelik, Florian Hibbe, and Jörg Kärger. "Assessing details of molecular motion in nanopores by combining different microscopic techniques." Diffusion fundamentals 11 (2009) 30, S. 1-2, 2009. https://ul.qucosa.de/id/qucosa%3A13973.

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20

Chmelik, Christian, Pavel Kortunov, Sergey Vasenkov, et al. "Transport diffusivity in zeolites: possible reasons for misleading results of macroscopic techniques." Diffusion fundamentals 2 (2005) 86, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14421.

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21

Ries, Jonas. "Advanced Fluorescence Correlation Techniques to Study Membrane Dynamics." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1219846317196-73420.

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Fluorescence Correlation Spectroscopy (FCS) is a powerful tool to measure important physical quantities such as concentrations, diffusion coefficients, diffusion modes or binding parameters, both in solution and in membranes. However, it can suffer from severe artifacts, especially in non-ideal systems. Here we develop several novel implementations of FCS which overcome these limitations and facilitate accurate and quantitative determination of dynamic parameters in membranes. Two-focus FCS with camera-detection allows for accurate and calibration-free determination of diffusion coefficients.

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22

Dvoyashkin, Muslim, Aiping Wang, Hrishi Bhase, Sergey Vasenkov, and Clifford R. Bowers. "Single-file dynamics in nanotubular materials probed by a combination of hyperpolarized tracer exchange and diffusion NMR techniques." Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-183080.

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23

Bassett, John. "Assessing the Spatial Diffusivity of Sound Fields in Rooms using Ambisonic Techniques." Thesis, The University of Sydney, 2012. http://hdl.handle.net/2123/8255.

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This thesis explores the means of objectively measuring diffuse sound fields contained within music performance auditoria. Although the diffuse field is considered to be an important component of the reverberant sound field there is currently no widely accepted method for its measurement. A review of methods shows that attempts to characterize the field may be divided into those methods that seek to directly measure the state of the field and those that indirectly indicate the existence of the state. The primary focus of this thesis is the application of Ambisonic techniques to capture the spa

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24

Vanacore, Giovanni Maria. "INVESTIGATION OF Ge SURFACE DIFFUSION AND SiGe NANOSTRUCTURES BY SPECTRO-MICROSCOPY TECHNIQUES." Phd thesis, Ecole Polytechnique X, 2011. http://tel.archives-ouvertes.fr/tel-00725427.

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SiGe nanostructures on crystalline Si substrates with (001) orientation are among the most studied system in condensed matter physics and nanoscience. This interest has been mainly driven by the important potential applications in opto and nano-electronic devices thanks to the improvement of the optical and electronic properties compared to bulk systems. These features come essentially from the possibility of engineering the strain field within the nanostructures using the lattice mismatch of ~ 4 % between Ge and Si and from the spatial confinement, capable of modifying the electronic band str

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25

Woźniak, Mariusz. "CARACTÉRISATION D'AGRÉGATS DE NANOPARTICULES PAR DES TECHNIQUES DE DIFFUSION DE LA LUMIÈRE." Phd thesis, Aix-Marseille Université, 2012. http://tel.archives-ouvertes.fr/tel-00747711.

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Ce travail de thèse de doctorat propose et évalue différentes solutions pour caractériser, avec des outils optiques et électromagnétiques non intrusifs, les nanoparticules et agrégats observés dans différents systèmes physiques : suspensions colloïdales, aérosols et plasma poussiéreux. Deux types de modèles sont utilisés pour décrire la morphologie: d'agrégats fractals (p. ex. : suies issues de la combustion, de procédés plasma) et agrégats compacts (qualifiés de " Buckyballs " et observés dans des aérosols produits par séchage de nano suspensions). Nous utilisons différentes théories et modèl

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26

Ali-Romson, Farida. "Détermination de coefficients de diffusion par diverses techniques de spectroscopie de fluorescence." Vandoeuvre-les-Nancy, INPL, 1991. http://www.theses.fr/1991INPLA001.

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27

Mattea, Carlos. "Molecular dynamics in porous media studied by Nuclear Magnetic Resonance techniques." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:289-vts-55830.

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28

Ainte, Mohamed Iman. "NMR techniques for measuring transport phenomena in microporous materials." Thesis, University of Cambridge, 2017. https://www.repository.cam.ac.uk/handle/1810/270581.

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The primary aim of this thesis is to investigate and quantify the self-diffusion processes of gaseous molecules adsorbed in industrially relevant microporous zeolite materials using Pulsed Field Gradient Nuclear Magnetic Resonance (PFG NMR). The main body of this work involves the use of weakly adsorbing hydrocarbon gases (CH4, C2H6 and C3H¬8) adsorbed in a large pore β-zeolite structure. This thesis describes the development of a solely PFG NMR based technique for measuring the molecular displacements of these species at varying length-scales. This enabled the characterisation of self-diffusi

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29

Kaloun, Soulaimane. "Vieillissement d'un verre colloïdal : Variations sur les techniques de diffusion de la lumière." Université Louis Pasteur (Strasbourg) (1971-2008), 2005. http://www.theses.fr/2005STR13057.

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Les résultats obtenus au cours de ce travail relèvent de trois aspects fondamentaux de la phénoménologie des systèmes vitreux : le vieillissement, le rajeunissement et les effets mémoire. Nous avons développé des expériences originales de diffusion de la lumière qui utilisent des caméras CCD comme multidétecteurs. Ces techniques permettent d’effectuer en temps réel une moyenne d’ensemble de l’intensité diffusée. L’étude du vieillissement d’un verre colloïdal de Laponite a été effectuée en incorporant des particules sondes pour suivre leur dynamique sur des échelles micrométriques grandes devan

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30

Boutet, Jérôme. "Localisation d'inclusions fluorescentes dans les milieux diffusants à l'aide de techniques laser. Application au diagnostic médical in vivo." Thesis, Grenoble, 2012. http://www.theses.fr/2012GRENY009/document.

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La tomographie de fluorescence est une méthode d'imagerie préclinique et clinique permettant de localiser des traceurs fluorescents préalablement injectés ou naturellement présents dans un organisme vivant. Ce travail de thèse à consisté, dans un premier temps, à définir l'architecture et les conditions d'utilisation optimales d'un tomographe de fluorescence continu appliqué à l'observation de tissus de faible épaisseur. On s'est en particulier attaché à traiter le problème de l'observation de tissus hétérogènes et d'organes fortement absorbants. Dans un deuxième temps, pour observer des tissu

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31

Chatfield, Stuart R. "A study of pore structure of human dental enamel using radiotracer techniques." Thesis, University of Bristol, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389134.

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32

Chmelik, Christian, Lars Heinke, Arati Varma, Dhananjai B. Shah, Jörg Kärger, and Rajamani Krishna. "Loading dependence of diffusion in zeolites: combined benefits of microscopic measuring techniques and theoretical approaches." Diffusion fundamentals 6 (2007) 59, S. 1-2, 2007. https://ul.qucosa.de/id/qucosa%3A14238.

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33

Bourdin, Vincent, Stefano Brandani, Alfeno Gunadi, et al. "Diffusion of n-alkanes in MFI-type zeolites: a comparative study with different measuring techniques." Diffusion fundamentals 2 (2005) 83, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14420.

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34

Giacalone, Elisabetta. "Graph-based analysis of brain structural connectivity using different diffusion MRI reconstruction techniques." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Il cervello si può definire un network complesso in cui delle regioni sono interconnesse fra loro. L'imaging di risonanza magnetica pesato in diffusione (DWI) insieme alla trattografia, permettono di ricostruire i fasci di fibre assonali di sostanza bianca indagando la connettività strutturale tra le aree di sostanza grigia. Il "connettoma" risultante può essere analizzato e caratterizzato attraverso la graph theory. Il lavoro che ho sviluppato presso l'unità di RM funzionale del Policlinico S. Orsola-Malpighi, e il DIBINEM, Università di Bologna, si propone di ricostruire il connettoma tramit

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35

McGuckin, C. E. "The mathematical modelling of diffusion techniques associated with osmotic dehydration of apple slices." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329361.

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36

Thomas, David Lee. "Magnetic resonance imaging of diffusion and perfusion : techniques and applications to cerebral ischaemia." Thesis, University College London (University of London), 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.391829.

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37

Nzikou, Jean-Mathurin. "Étude des phénomènes de diffusion des solutés ioniques par techniques voltamétrique et conductimétrique." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL145N.

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Les phénomènes de transport constituent en eux seuls un vaste domaine d'étude qui se veut indispensable dans la compréhension des comportements des réacteurs électrochimiques et polyphasiques. Le but de ce travail a consisté à la mise en œuvre de deux différentes méthodes de détermination du coefficient de diffusion, qu'il a fallu ensuite confronter afin d'établir un quelconque lien entre elles ; nous avons de ce fait mis en œuvre la première méthode dite classique, largement utilisée en génie chimique. Elle décrit les phénomènes de manière très simple, mais demeure toutefois limitée car elle

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38

Lin, Xuelei. "Preconditioning techniques for all-at-once linear systems arising from advection diffusion equations." HKBU Institutional Repository, 2020. https://repository.hkbu.edu.hk/etd_oa/803.

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In this thesis, we mainly study preconditioning techniques for all-at-once linear systems arising from discretization of three types of time-dependent advection-diffusion equation: linear diffusion equation, constant-coefficients advection-diffusion equation, time-fractional sub-diffusion equation. The proposed preconditioners are used with Krylov subspace solvers. The preconditioner developed for linear diffusion equation is based on -circulant ap- proximation of temporal discretization. Diagonalizability, clustering of spectrum and identity-plus-low-rank decomposition are derived for the p

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39

Thambipillai, Vasumathy. "A study of the diffusion of mercury into cadmium telluride using mainly radioactive tracer techniques." Thesis, Coventry University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.278545.

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40

Thermitus, Marc-Antoine. "Nouvelles techniques d'identification de la diffusivité thermique par la méthode Flash." Lyon, INSA, 1997. http://www.theses.fr/1997ISAL0029.

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Ce travail porte sur l'identification de la diffusivité thermique des matériaux opaques et isotropes par la méthode flash. Dans une première approche, on exploite non seulement le thermogramme de la face arrière mais aussi celui de la face qui reçoit l'impulsion thermique. Le rapport des des deux thermogrammes offre l'avantage d’être indépendant de la diffusion radiale de la chaleur dans l’échantillon. La diffusivité peut alors être identifiée par la méthode des moments temporels partiels. Une autre manière de tenir compte des deux thermogrammes est de calculer le rapport de leurs transformées

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41

Lechner, Ruep Ekkehard, Goetz Schuck, and Klaus Langer. "Mechanism of proton conduction in solid-state protonic conductors: method and results from investigations by QENS techniques." Diffusion fundamentals 12 (2010) 3, 2010. https://ul.qucosa.de/id/qucosa%3A13865.

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42

Larsson, Henrik. "Internal oxidation processing : New alloys and new simulation techniques." Doctoral thesis, KTH, Materialvetenskap, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3715.

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Nitriding and oxidising treatments of alloys for toolingpurposes have been investigated both experimentally andtheoretically. Specimens prepared by a combination of differentprocessing steps are investigated by light-optical, scanningand transmission electron microscopy and hardness measurments.The bounds of carbon and nitrogen concentration profiles duringnitriding are obtained from simulations using the DICTRA code.As a result, a new processing route to produce oxide-dispersediron-base alloys with large volume fraction of carbides issuggested. On the theoretical side the methods based on the

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43

Jetin, Bruno. "La diffusion des innovations techniques et organisationnelles dans un pays à l'inflation élevée : l'exemple du Brésil." Paris 13, 1992. http://www.theses.fr/1992PA131014.

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Le bresil a connu au cours de la decennie 1980 une crise economique profonde qui se caracterise par une baisse de l'investissement productif, une hyperinflation rampante et une financiarisation de l7economie. Cette crise a genere une profonde incertitude et un retrecissement de l'horizon temporel des entreprises. Cette derniere evolution entre en contradiction avec les exigences du modele de la production de masse flexible, qui emerge dans les pays developpes, comme on peut le constater dans l'industrie automobile. En effet, ce nouveau paradigme socio-productif necessite de la part des entrepr

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44

Dvoyashkin, Muslim, Aiping Wang, Hrishi Bhase, Sergey Vasenkov, and Clifford R. Bowers. "Single-file dynamics in nanotubular materials probed by a combination of hyperpolarized tracer exchange and diffusion NMR techniques." Diffusion fundamentals 20 (2013) 49, S. 1-2, 2013. https://ul.qucosa.de/id/qucosa%3A13622.

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45

Habib, Dayane. "Diffusion de l'hélium-3 hyperpolarisé dans le tissu pulmonaire : évaluation par différentes techniques IRM." Phd thesis, Université Paris Sud - Paris XI, 2007. http://tel.archives-ouvertes.fr/tel-00435916.

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Ce travail présente une étude expérimentale sur l'effet de la diffusion restreinte de l'hélium-3 hyperpolarisé dans l'acinus pulmonaire effectuée à bas champ magnétique 0,1 T. Plusieurs fantômes avec différentes tailles et connections modélisant l'acinus humain sain et à un stade précoce de l'emphysème ont été réalisés selon le modèle de Kitaoka. L'atténuation du signal dévie par rapport au comportement prévu de décroissance exponentielle en G2, G étant l'intensité de gradient. Cette observation indique une certaine ambiguïté sur la possibilité de quantifier de façon absolue le coefficient de

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46

Ebada, Mohamed. "Multipath Routing for Wireless Sensor Networks: A Hybrid Between Source Routing and Diffusion Techniques." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19887.

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In this thesis, an investigation of the performance of multipath routing in Wireless Sensor Networks (WSN) is performed. The communication in the network under study is to take place from individual nodes to the sink node. The investigation involved multipath finding methods in WSN. Also, it involves investigating the weight assignment, traffic splitting and route selection methods for the different paths discovered by each node in the WSN. Also, a comparison between Hybrid Routing Protocol, Source Routing Protocol and Diffusion Routing Protocol is performed. A simple traffic routing algori

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47

Keshava, Murthy Krishna Nand. "Novel representation and low level computer vision techniques for manifold valued diffusion tensor MRI." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/42312.

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Diffusion tensor magnetic resonance imaging (DT-MRI) is a powerful non-invasive imaging modality whose processing, analysis and visualization has become a strong focus in medical imaging research. In this modality, the direction of the water diffusion is locally modeled by a Gaussian probability density function whose covariance matrix is a second order 3 X 3 symmetric positive definite matrix, also called the tensor here. The manifold-valued nature of the data as well as its high dimensionality makes the computational analysis of DT images complex. Very often, the data dimensionality is reduc

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48

Bruland, K. "British technology and Norwegian industrialization : The diffusion of textile techniques from 1845 to 1870." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375880.

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49

Clark, Christopher Alan. "Magnetic resonance techniques for measurement of water diffusion in the human central nervous system." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286293.

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50

Marquardt, Pascal [Verfasser], and Wilhelm [Akademischer Betreuer] Heinrichs. "Adaptive spectral least-squares techniques for reaction-diffusion equations / Pascal Marquardt ; Betreuer: Wilhelm Heinrichs." Duisburg, 2020. http://d-nb.info/1212362470/34.

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