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Dissertations / Theses on the topic 'Boundary triples'

Author: Grafiati

Published: 8 June 2024

Last updated: 31 July 2025

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1

Siv, Easeng. "Étude expérimentale mésoscopique de la migration des interfaces dans le cuivre polycristallin." Thesis, Sorbonne Paris Cité, 2019. http://www.theses.fr/2019USPCD031.

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Un polycristal est constitué par un agglomérat de monocristaux micrométriques accolés les uns aux autres. L’interface entre deux monocristaux tournés constitue un joint de grains (JdG). Les JdGs jouent un rôle important dans le comportement plastique des matériaux cristallins. Sous certaines conditions de traitement thermique (TT) ou de thermomécanique (TM), les JdGs peuvent migrer et font évoluer profondément les microstructures. Ces phénomènes anciens restent toutefois mal connus et il n’existe pas de modèle quantitatif décrivant la migration. Dans ce contexte, nous avons étudié expérimental

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2

Watkins, John D. "Enhancing triple phase boundary electrosynthesis." Thesis, University of Bath, 2011. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.547876.

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The first part of this thesis is concerned with the synthesis, characterisation and applications of surface functionalised carbon nanoparticles. Synthetic techniques are used to modify the existing surface architecture of carbon nanoparticles towards high surface area modified electrodes and pH sensing applications. Electrochemical and synthetic techniques have been used to study triple phase boundaries and enhance their properties towards a bulk synthetic technique, in which an electrolyte phase and redox probe phase are held separate. A salt matrix, ultrasound, high shear force and a carbon

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3

Clarke, D. S. "Problems in triple-deck boundary layer theory." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370406.

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4

Collins, Andrew. "Photo-electrochemical processes at the triple phase boundary." Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557818.

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The main aim and ultimate final goal of the work carried out in this thesis is a drive towards a feasible system for light harvesting, which is in short, using the Sun’s energy to create electricity or a fuel for our energy requirements here on Earth. This work will see an approach using the triple phase boundary afforded by a microdroplet array. Although light harvesting is an ambition which has seen decades of work and uncountable man-hours, approaching it from the angle of utilizing the triple phase boundary between two immiscible liquids and a solid electrode is a new, and novel concept. B

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5

Mohsen, Hassan. "Estimations uniformes pour des problèmes de transmission à changement de signe : Liens avec les triplets de frontière et la quantification de l’incertitude." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0227.

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Présentation du domaine: Il s'agit d'étudier des opérateurs différentiels sur des variétés riemanniennes singulières et leurs applications. Parmi les opérateurs les plus importants, on trouve les opérateurs de Laplace et de Dirac. Il y a beaucoup de connexions entre les deux types d'opérateurs, à cause de la formule de Lichnerowicz, un mathématicien français du dernier siècle. Pourtant, les opérateurs de Laplace ont été beaucoup plus étudiés que les opérateurs de Dirac. Les opérateurs de Dirac, aussi appelé opérateurs d'Atiyah--Singer, sont des opérateurs fondamentaux dans la géométrie riemann

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6

Soltanzadeh, Marjan. "Modeling Triple Phase Boundary (TPB) in Solid Oxide Fuel Cell (SOFC) Anode." Thesis, University of Ottawa (Canada), 2010. http://hdl.handle.net/10393/28843.

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The idea of having the triple phase boundary (TPB) is extensively used in the fuel cell literature, especially with respect to solid oxide fuel cells (SOFC). The TPB concept indicates that the hydrogen oxidation reaction and the oxygen reduction reaction, which produce electric current, can actually occur at special sites, called "triple phase boundaries" where the gaseous fuel phase, ion conducting phase: electrolyte, and electron conducting phase, come into contact. Recent study shows that despite the common assumption about TPB, it is not just a point, but a zone that consists of two lines.

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7

Wang, Chingfu. "Triple phase boundary engineering of electrodes for solid oxide fuel cells by inkjet printing." Thesis, University of Cambridge, 2014. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708301.

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8

Pabit, Edgardo L. "Grain boundary and triple junction chemistry of silicon carbide sintered with minimum additives for armor applications." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0012140.

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9

Zhou, Yijian. "Effects of grain boundary and triple line structures on carbide precipitation in type 304L stainless steel." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0019/MQ54131.pdf.

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10

Aljohani, Abdulrahman. "Applications of triple deck theory to study the flow over localised heating elements in boundary layers." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/applications-of-triple-deck-theory-to-study-the-flow-over-localised-heating-elements-in-boundary-layers(a3174ce1-f4db-47d8-b0a7-a712461a8211).html.

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In this thesis, we investigate flow past an array of micro-electro-mechanical-type (MEMS-type) heating elements placed on a flat surface, where MEMS devices have hump-shaped surfaces, using the triple deck theory. In this work we start by investigating the problem with a single heating element. MEMS devices can be used to control the fluid dynamics over the surface. Hence, we present a review of the boundary layer and the triple deck theories, followed by a literature review of the problem of flow past an array of MEMS devices. Next, we formulate our problem with the aid of the method of match

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11

Wicht, Stefan [Verfasser], Thomas Gutachter] Kiefhaber, Mike [Gutachter] Schutkowski, and Ralf [Gutachter] [Seidel. "Characterization of the boundary diffusion mechanism for the Helix-Coil transition in peptides by Triplet-Triplet energy transfer / Stefan Wicht ; Gutachter: Thomas Kiefhaber, Mike Schutkowski, Ralf Seidel." Halle (Saale) : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2019. http://nbn-resolving.de/urn:nbn:de:gbv:3:4-1981185920-140249.

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12

Wicht, Stefan [Verfasser], Thomas [Gutachter] Kiefhaber, Mike [Gutachter] Schutkowski, and Ralf [Gutachter] Seidel. "Characterization of the boundary diffusion mechanism for the Helix-Coil transition in peptides by Triplet-Triplet energy transfer / Stefan Wicht ; Gutachter: Thomas Kiefhaber, Mike Schutkowski, Ralf Seidel." Halle (Saale) : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2019. http://d-nb.info/1210730847/34.

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13

Ye, Haihui. "Microstructure and chemistry of grain-boundary films and triple-junction phases in liquid-phase sintered SiC ceramics." [S.l. : s.n.], 2002. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9831555.

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14

Ciochetto, David S. "Analysis of Three Dimensional Turbulent Shear Flow Experiments with Respect to Algebraic Modeling Parameters." Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36808.

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The extension of the theory for two dimensional turbulent boundary layers into three dimensional flows has met with limited success. The failure of the extended models is attributed to the anisotropy of the turbulence. This is seen by the turbulent shear stress angle lagging the flow gradient angle and by the behavior of the Reynolds shear stresses lagging that of the mean flow. Transport equations for the turbulent shear stresses were proposed to be included in a modeling effort capable of accounting for the lags seen in the flow. This study is aimed at developing algebraic relationships betw

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15

Sayet, Julien. "Effect of grain boundary nature and connectivity on the diffusion of hydrogen in heterogeneous materials : numerical study." Electronic Thesis or Diss., La Rochelle, 2023. http://www.theses.fr/2023LAROS005.

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Pour anticiper la fragilisation par l'hydrogène, il faut connaître l'effet des différentes échelles temporelles et spatiales sur les processus de diffusion et de piégeage dans la microstructure du matériau. Dans ce travail, nous examinons l'impact de différents types de jonctions triples (TJ) et de joints de grains (GB) et de leur connectivité sur la diffusion de l'hydrogène. Tout d'abord, nous proposons quatre algorithmes pour contrôler la distribution des fractions de TJ en fonction d'une fraction donnée de joints de grains aléatoires. Ensuite, à l'aide de la modélisation par éléments finis,

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16

Sibrant, Aurore. "Evolution of the Graciosa, S. Miguel and Santa Maria volcanic islands : implications for the Nubia-Eurasia plate boundary in the Azores." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112303/document.

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L’archipel des Açores dans l’océan Atlantique est édifiées sur un épais plateau océanique, à proximité de la jonction triple entre les plaques Nord-américaine (Na), Nubienne (Nu) et Eurasienne (Eu). La formation du plateau et l’origine du volcanisme ont été le plus souvent attribués à la présence d’une instabilité mantellique. Cependant, la répartition et la morphologie des édifices volcaniques semblent avoir été grandement influencés par la déformation régionale liée à la migration de la frontière de plaque (Eu/Nu). En effet, la frontière serait passée d’une faille transformante aujourd’hui i

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17

Stewart, Devin O. "Effects of Spacing and Geometry of Distributed Roughness Elements on a Two-Dimensional Turbulent Boundary Layer." Thesis, Virginia Tech, 2005. http://hdl.handle.net/10919/35481.

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This thesis is a study of the effects of distributed roughness elements on a two-dimensional turbulent boundary layer. Measurements were taken on a total of ten rough wall configurations: four involving Gaussian spikes, and six with circular cylindrical posts. Rough wall flows are particularly suited to study with Laser Doppler Velocimetry (LDV) due to the fact that measurements are required near a solid surface, as well has in highly turbulent fluid. The LDV system used in this study is a fine resolution (~50 micron), three-component, fiber optic system. All mean velocities, Reynolds stresses

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18

Wilhelm, Lukas. "A rigorous Landauer-Büttiker formula and its application to models of a quantum dot LED." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät II, 2013. http://dx.doi.org/10.18452/16690.

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Die vorliegende Arbeit behandelt die Modellierung einer Quantenpunkt-LED und die Berechnung des elektrischen Stromes und der Lichtproduktion im Landauer-Büttiker-Formalismus. Die Elektron-Photon-Wechselwirkung kann im Landauer-Büttiker-Formalismus behandelt werden, indem wir annehmen, dass jedes Elektron mit einem separaten Photonenfeld interagiert. Dies erlaubt es uns, ein Elektron zusammen mit seinem Photonenfeld als „einzelnes, nicht wechselwirkendes Teilchen“ im Sinne des Landauer-Büttiker-Formalismusses zu betrachten. Wir entwickeln ein Modell einer QP-LED, dessen Elektron-Photon-Wechse

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19

Ye, Haihui [Verfasser]. "Microstructure and chemistry of grain boundary films and triple junction phases in liquid phase sintered SiC ceramics / Institut für Nichtmetallische Anorganische Materialien der Universität Stuttgart ... Vorgelegt von Haihui Ye." Stuttgart : Max-Planck-Inst. für Metallforschung, 2002. http://d-nb.info/964301148/34.

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20

Parikh, Harshil R. "Microstructure Changes In Solid Oxide Fuel Cell Anodes After Operation, Observed Using Three-Dimensional Reconstruction And Microchemical Analysis." Case Western Reserve University School of Graduate Studies / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=case1417765534.

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21

Noël, Emeline. "Simulation numérique directe d’écoulements à l’aide d’une méthode de frontière immergée." Thesis, Rouen, INSA, 2012. http://www.theses.fr/2012ISAM0020/document.

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Les travaux menés, depuis plusieurs années, au CORIA ont abouti à la construction d’un outil numérique (ARCHER) permettant la simulation numérique directe d’écoulements diphasiques et notamment l’atomisation d’un jet liquide à haute vitesse. Ce type de simulation permet de capturer les phénomènes d’atomisation au voisinage de l’injecteur difficilement caractérisables par les outils expérimentaux actuels. Ces simulations requièrent des conditions d’injection délicates à évaluer a priori car elles dépendent des caractéristiques de l’écoulement au sein de l’injecteur. Or, certains jets présentent

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22

Crane, Samantha. "High resolution transmission electron microscopy analysis of the influence of grain boundary and triple grain junction crystallinity and chemistry on silicon carbide-based armor with small additions of aluminum, boron, and carbon." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010845.

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23

Scheel, Ramona. "Sustainable Business through Voluntary Disclosures: Motivations for Adopting Reporting Guidance, Boundaries and Assurance." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-135873.

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This paper explores the extent to which corporations currently increase the voluntary disclosures in triple bottom line (TBL) reports. Although research already has provided substantial contributions as to why and how firms apply TBL reporting, there remains limited understanding of the motivations for and against making voluntary disclosures. Drawing from literature in environmental management and accounting as well as international auditing, this work focuses on guidance, boundarysetting and external assurance for TBL reports. An inductive case study approach is applied to investigate the cr

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24

Scheel, Ramona. "Sustainable Business through Voluntary Disclosures: Motivations for Adopting Reporting Guidance, Boundaries and Assurance." Technische Universität Dresden, 2011. https://tud.qucosa.de/id/qucosa%3A27685.

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This paper explores the extent to which corporations currently increase the voluntary disclosures in triple bottom line (TBL) reports. Although research already has provided substantial contributions as to why and how firms apply TBL reporting, there remains limited understanding of the motivations for and against making voluntary disclosures. Drawing from literature in environmental management and accounting as well as international auditing, this work focuses on guidance, boundarysetting and external assurance for TBL reports. An inductive case study approach is applied to investigate the cr

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25

Ramasamy, Devaraj. "Extension of electrochemically active sites in SOFCs and SOECs." Doctoral thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/14813.

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Doutoramento em Nanociências e Nanotecnologia<br>Solid oxide fuel (SOFCs) and electrolyzer (SOECs) cells have been promoted as promising technologies for the stabilization of fuel supply and usage in future green energy systems. SOFCs are devices that produce electricity by the oxidation of hydrogen or hydrocarbon fuels with high efficiency. Conversely, SOECs can offer the reverse reaction, where synthetic fuels can be generated by the input of renewable electricity. Due to this similar but inverse nature of SOFCs and SOECs, these devices have traditionally been constructed from compara

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26

Lang, Christian. "Heterogene Interdiffusion von nanokristallinen Cu-Co-Au-Schichten." [S.l. : s.n.], 2001. http://webdoc.sub.gwdg.de/diss/2002/lang/lang.pdf.

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27

CHERMISI, MILENA. "Crystalline flow of planar partitions and a geometric approach for systems of PDEs." Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2006. http://hdl.handle.net/2108/202647.

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La presente tesi tratta due argomenti distinti. Il Capitolo 1 e il Capitolo 2 riguardano problemi di evoluzione di interfacce nel piano. Nel Capitolo 1 viene considerata l’evoluzione di un materiale policristallino con tre (o più) fasi, in presenza di un’anisotropia cristallina (pari) ϕo la cui linea di livello 1, Fϕ :={ϕo ≤1} (Frank diagram), è un poligono regolare di n lati. La funzione duale ϕ : R2 →R deﬁnita da ϕ(ξ) := sup{ξ·η : ϕo(η)≤1}´e anch’essa un’anisotropia cristallina e Wϕ := {ϕ ≤ 1} è detta Wulﬀ shape. In particolare, viene studiato il moto per curvatura cristallina di triodi elem

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28

Weichselbaum, Andreas. "Nanoscale Quantum Dynamics and Electrostatic Coupling." Ohio University / OhioLINK, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1091115085.

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29

Turtayeva, Zarina. "Genesis of AEMFC (anion exchange membrane fuel cell) at the lab scale : from PEMFC’s inks composition toward fuel cell bench tests in alkaline media." Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0285.

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Les piles à combustible à membrane échangeuse d'anions (AEMFC) ont récemment attiré l'attention en tant que piles à combustible alternatives à faible coût aux piles à combustible à membrane échangeuse de protons traditionnelles en raison de l'utilisation possible d'électrocatalyseurs non-nobles. Bien que l'AEMFC ressemble à la PEMFC, les problèmes de gestion de l'eau sont plus prégnants dans une AEMFC car l'ORR en milieu alcalin nécessite de l'eau, tandis qu'en même temps, de l'eau est produite en grande quantité du côté de l'anode. Pour mieux comprendre la gestion de l'eau dans ce type de pil

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30

Liao, Yu-yu, and 廖佑諭. "The Influence of Grain Boundary and Triple Junction on Plastic Deformation." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/31954568463689458781.

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碩士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>95<br>Deformation heterogeneity at the mesoscale plays a central role at understanding the Hall-Petch relationship, strain hardening, and recrystallization. This heterogeneity is not predicted by the classical theory of Taylor model in which the features of crystallographic texture are explained. In past, crystal plasticity finite-element (CPFEM) simulations were used in modeling polycrystalline plasticity by considering both compatibility of strain and stress at interfaces. However, the effects of the microstrcutre features, such as grain boundaries and triple

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31

Lo, Hui-Chun, and 羅慧君. "Existence of Triple Solutions for the Differential and Difference Boundary Value Problems." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/97490609968102743392.

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碩士<br>淡江大學<br>數學學系<br>88<br>We consider the existence of triple solutions for nth order ordinary differential equation : where and is fixed where is a nonnegative continuous function on . We also consider the (n, p) difference equation where and is a fixed integer satisfying We assume there exist a continuous functions and such that for By employing Leggett-Williams fixed point theorem for operators on a cone, existence criteria are developed for multiple (at least three) positive solutions of the boundary value

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32

Aramfard, Mohammad. "Influences of stress-driven grain boundary motion on microstructural evolution in nanocrystalline metals." 2015. http://hdl.handle.net/1993/30957.

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Nanocrystalline (NC) metals with averaged grain size smaller than 100 nm have shown promising mechanical properties such as higher hardness and toughness than conventional coarse-grained metals. Unlike conventional metals in which the deformation is controlled by dislocation activities, the microstructural evolution in NC metals is mainly dominated by grain rotation and stress-driven grain boundary motion (SDGBM) due to the high density of grain boundaries (GBs). SDGBM is thus among the most studied modes of microstructural evolution in NC materials with particular interests on their fundament

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33

Abbaspour, Gharamaleki Ali. "Micro-modeling and study of the impact of microstructure on the performance of solid oxide fuel cell electrodes." Phd thesis, 2010. http://hdl.handle.net/10048/1339.

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As the demand for green energy and fuel cells grows, more attention is drawn towards Solid Oxide Fuel Cells (SOFCs). Random and complex structure of composite electrodes and underlying electrochemical process has not been completely unveiled yet and further study is required to acquire more understanding. Modeling in this regard plays an important role as it pinpoints key parameters in optimum design of the cell without resorting to costly and uncertain experiments which might even lead to misinterpretations due to random nature of experimental data. The aim of this work is to develop a new ri

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34

Gaweł, Duncan Albert Wojciech. "The Development of a Coupled Physics and Kinetics Model to Computationally Predict the Powder to Power Performance of Solid Oxide Fuel Cell Anode Microstructures." Thesis, 2013. http://hdl.handle.net/1974/8399.

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A numerical model was developed to evaluate the performance of detailed solid oxide fuel cell (SOFC) anode microstructures obtained from experimental reconstruction techniques or generated from synthetic computational techniques. The model is also capable of identifying the linear triple phase boundary (TPB) reaction sites and evaluating the effective transport within the detailed structures, allowing a comparison between the structural properties and performance to be conducted. To simulate the cell performance, a novel numerical coupling technique was developed in OpenFOAM and validated. The

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35

Cordier, Antonie. "Radikale en gedifferensieerde universumgerigte pentekostalisme." 2000. http://hdl.handle.net/10500/17927.

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Text in Afrikaans<br>In hierdie navorsingstuk word 'n totaal nuwe Radikale en gedifferensieerde Universumgerigte aanloop tot die teologie, die peumato/ogie en veral die ou klassieke pentekosta/isme se eng partikularistiese en sogenaamde unieke elitistiese geestesdoopmodel krities teologies-filosofies ondersoek. Hoewel die moderner neopentekostalistiese oftewel charismatiese weergawe van klassieke pentekostalisme aandag kry om as kriterium van vergelyking le dien, val die hoofklem op klassieke pentekosta/isme. Uiteraard kom die verskillende Geesdoopmodelle pertinent aan die orde. En in die lig

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Roach, Lisa Aretha Nyala. "Temporal Variations in the Compliance of Gas Hydrate Formations." Thesis, 2012. http://hdl.handle.net/1807/44081.

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Seafloor compliance is a non-intrusive geophysical method sensitive to the shear modulus of the sediments below the seafloor. A compliance analysis requires the computation of the frequency dependent transfer function between the vertical stress, produced at the seafloor by the ultra low frequency passive source-infra-gravity waves, and the resulting displacement, related to velocity through the frequency. The displacement of the ocean floor is dependent on the elastic structure of the sediments and the compliance function is tuned to different depths, i.e., a change in the elastic parameters

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