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Teses / dissertações sobre o tema "OER reaction"

Autor: Grafiati

Publicado: 22 de fevereiro de 2025

Última modificação: 31 de julho de 2025

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1

Chen, Junsheng. "Ternary Metal Oxide/(Oxy)Hydroxide for Efficient Oxygen Evolution Reaction." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25536.

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Novel clean energy conversion and storage technologies, such as electrochemical water splitting and metal-air battery, play significant roles in the future clean energy society. Oxygen evolution reaction (OER), as the fundamental reaction of these technologies, is crucial for their practical application. However, OER process is sluggish since the complex reaction process (multi-electron and multi-intermediate involved reaction). Developing efficient and affordable OER electrocatalysts remains a great challenge. Recently, the multimetal incorporation strategy has aroused extensive research inte

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2

Mamtani, Kuldeep. "Carbon-based Materials for Oxygen Reduction Reaction (ORR) and Oxygen Evolution Reaction (OER) in Acidic Media." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu149376896628355.

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3

Wu, Qi-Long. "Defect Based Three-Dimensional Hierarchical Porous Carbons for Efficient Oxygen Reduction Reaction." Thesis, Griffith University, 2022. http://hdl.handle.net/10072/419073.

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The energy crisis and environmental pollution are the two major global issues caused by the excessive utilization of fossil fuels. In recent decades, developing renewable energy via electrocatalytic conversion technology has been considered as a feasible approach to replace fossil fuels. However, the scarcity and high price of commercial catalysts (e.g., Pt/C catalyst for oxygen reduction reaction (ORR) and hydrogen evolution reaction (HER); RuO2 for oxygen evolution reaction (OER)) seriously hinder the industrialization of the electrocatalytic technology. Therefore, it is highly urgent to dev

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4

Zou, Yu. "Supported Composite Electrocatalysts for Energy Conversion Applications." Thesis, Griffith University, 2022. http://hdl.handle.net/10072/417198.

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Increasing energy demand and environmental awareness have promoted the development of efficient and environment-friendly hydrogen technologies. Water electrolysis (2𝐻2𝑂→2𝐻2+𝑂2) is a promising way to store renewable electricity generated by solar or wind energy into chemical fuel in the form of H2. Water electrolysis is comprised of a hydrogen evolution reaction (HER) on the cathode and an oxygen evolution reaction (OER) on the anode. For both HER and OER, highly catalytic active electrocatalysts are required to lower the overpotentials and to speed up the sluggish kinetics. To date, noble meta

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5

Duan, Yan. "Understanding the oxygen evolution reaction (OER) for Co based transition metal oxides / hydroxides in alkaline electrolytes." Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS416.

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Le développement d'électrocatalyseurs efficaces pour la réaction de libération d'oxygène (OER) est important pour améliorer l'efficacité globale du processus d'électrolyse de l'eau. Les oxydes / hydroxydes de métaux de transition présentent une activité et une stabilité raisonnables lorsqu’utilisés dans un milieu alcalin. Ils ont le potentiel de remplacer les oxydes à base d'Ir et de Ru. Comprendre la réaction d’OER pour les oxydes / hydroxydes de métaux de transition dans les électrolytes alcalins aide à la conception d'électrocatalyseurs peu coûteux et très efficaces. Avec trois travaux diff

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6

Stevens, Michaela. "Fundamentals and Industrial Applications: Understanding First Row Transition Metal (Oxy)Hydroxides as Oxygen Evolution Reaction Catalysts." Thesis, University of Oregon, 2017. http://hdl.handle.net/1794/22633.

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Intermittent renewable energy sources, such as solar and wind, will only be viable if the electrical energy can be stored efficiently. It is possible to store electrical energy cleanly by splitting the water into oxygen (a clean byproduct) and hydrogen (an energy dense fuel) via water electrolysis. The efficiency of hydrogen production is limited, in part, by the high kinetic overpotential of the oxygen evolution reaction (OER). OER catalysts have been extensively studied for the last several decades. However, no new highly active catalyst has been developed in decades. One reason that breakt

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7

Al-Mamun, Mohammad. "Rational Design of Nanostructured Earth-Abundant Electrocatalysts for Energy Conversion Applications." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/365651.

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Electrocatalysis contributes to a huge extent in a large array of research fields and applications, including corrosion science, electroanalytical sensors, wastewater treatment, electro-organic synthesis and more importantly, energy conversion applications. Of the many electrocatalytic processes, the oxygen evolution reaction (OER) and triiodide reduction reaction (IRR) are of widespread importance in electrochemical cells and dye-sensitised solar cells (DSSCs). OER is a key half reaction in electrochemical water splitting, direct solar-to-electricity driven water splitting and metal-air batte

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8

Bernicke, Michael [Verfasser], Ralph [Akademischer Betreuer] Krähnert, Peter [Gutachter] Strasser, and Michael [Gutachter] Bron. "Mesoporous oxides as efficient catalysts for the electrocatalytic oxygen evolution reaction (OER) / Michael Bernicke ; Gutachter: Peter Strasser, Michael Bron ; Betreuer: Ralph Krähnert." Berlin : Technische Universität Berlin, 2016. http://d-nb.info/1156010195/34.

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9

Terry, Alexandre. "New mixed 3d metal-based oxyfluorinated materials as anodic catalysts for water splitting : from elaboration to mechanistic study." Electronic Thesis or Diss., Le Mans, 2024. https://cyberdoc-int.univ-lemans.fr/Theses/2024/2024LEMA1029.pdf.

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Si l'hydrogène est un vecteur énergétique prometteur pour le stockage durable de l'énergie, sa production doit reposer sur des technologies sans carbone. L’électrolyse de l’eau qui consiste à dissocier l'eau via un courant électrique issu d’énergies renouvelables est idéal pour produire un hydrogène vert. Toutefois, ce processus est entravé par une cinétique lente de la réaction OER (Oxygen Evolution Reaction, 2H2O ⇋ O2 + 4H+ + 4e-) à l'anode, nécessitant un apport d’énergie supplémentaire pour assurer un rendement énergétique satisfaisant. Ainsi, des catalyseurs, généralement des oxydes d'iri

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10

Kumar, Kavita. "Catalyseurs sans métaux nobles pour pile à combustible régénérative." Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT2284/document.

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Le dihydrogène (H2) se présente comme le futur vecteur énergétique pour une économie basée sur des ressources propres et respectueuses de l'environnement. Il est le combustible idéal de la pile à combustible régénérative constituée de deux entités : un électrolyseur pour sa production, et une pile à combustible pour sa conversion directe en énergie électrique. Ce système présente l'avantage d'être compact et autonome. Cependant, l'amélioration de l'activité catalytique des matériaux, leur stabilité et l'élimination de métaux nobles dans leur composition sont nécessaires. Des catalyseurs bifonc

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11

Barry, Marie Porterfield. "Lesson 17 Part 1: Reactions to the Modern World-Introduction and Impressionism." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/art-appreciation-oer/18.

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12

Yan, Xuecheng. "Carbon-based Porous Materials for Electrochemical Reactions." Thesis, Griffith University, 2016. http://hdl.handle.net/10072/366852.

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The exploration of highly active and durable cathodic oxygen reduction reaction (ORR) catalysts with economical production cost is still the bottleneck to realize the large-scale commercialization of some emerging technologies, such as fuel cells and metal-air batteries. At present, the composite that contains expensive platinum (Pt) particles dispersed on a porous carbon support (e.g., activated carbon (AC)) is the most efficient ORR catalyst. In a common sense, the AC itself normally shows very low activity for the ORR, so the Pt particles are vital. Imagine that if we remove all of the Pt

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13

Barry, Marie Porterfield. "Lesson 17 Part 2: Reactions to the Modern World-Post-Impressionism and Expressionism." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/art-appreciation-oer/19.

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This lessons covers the difference between impressionism and expressionism. Post-impressionism is represented through artworks by Vincent Van Gogh, Paul Gauguin, Paul Cèzanne, and Henri de Toulouse-Lautrec. Expressionism is represented through artworks by Edvard Munch, Henri Matisse, Ernst Ludwig Kirchner, and Vassily Kandinsky.

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14

Filimonenkov, Ivan. "Electrocatalyse de la réduction de l’oxygène et de l’oxydation de l’eau par des oxydes de métaux de transition : cas des pérovskites de Mn et Co." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAF072.

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L’étude de l'électrocatalyse des réactions de réduction de l'oxygène (RRO) et de dégagement de l'oxygène (RDO) est étroitement reliée au développement de matériaux cathodiques et anodiques pour les piles à combustible et les électrolyseurs. L’objectif de cette thèse est de développer et d’étudier des matériaux d’électrodes à base d’oxydes de Mn et de Co, actifs et stables, à la fois pour la RRO et la RDO. Les relations entre les caractéristiques électrochimiques des compositions pérovskite / carbone et les propriétés de leurs composants sont établies et étayées expérimentalement dans la thèse.

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15

Saveleva, Viktoriia. "Investigation of the anodes of PEM water electrolyzers by operando synchrotron-based photoemission spectroscopy." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF002/document.

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Le développement de catalyseurs de la réaction de dégagement de l’oxygène (OER) pour les électrolyseurs à membrane échangeuse de protons (PEM) dépend de la compréhension du mécanisme de cette réaction. Cette thèse est consacrée à l'application de la spectroscopie d’émission de photoélectrons induits par rayons X (XPS) et de la spectroscopie de structure près du front d'absorption de rayons X (NEXAFS) operando sous une pression proche de l'ambiante (NAP) dans le but d’étudier les mécanismes de la réaction d’oxydation de l’eau sur des anodes à base d’iridium et de ruthénium et leurs dégradation

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16

Gabe, Atsushi. "Understanding of Carbon Active Sites for Oxygen Reduction Reaction." Doctoral thesis, Universidad de Alicante, 2018. http://hdl.handle.net/10045/87127.

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Este trabajo de Tesis Doctoral se ha centrado en comprender el comportamiento de electrocatalizadores basados en materiales carbonosos para la reacción de reducción de oxígeno. Con el fin de profundizar en el conocimiento de la naturaleza de los sitios activos de catalizadores basados en materiales carbonosos para esta reacción, se han seleccionado o preparado muestras con diferentes composiciones, texturas porosas y estructuras. De estos resultados se han conseguido importantes avances en el conocimiento del papel que los sitios activos de catalizadores basados en materiales carbonosos desemp

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17

Yu, Kyle Kai-Hung. "Interfacial Electrochemistry of Copper and Spectro-Electrochemical Characterization of Oxygen Reduction Reaction." Thesis, University of North Texas, 2011. https://digital.library.unt.edu/ark:/67531/metadc103416/.

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The first part of this dissertation highlights the contents of the electrochemical characterization of Cu and its electroplating on Ru-based substrates. The growth of Ru native oxide does diminish the efficiency of Cu plating on Ru surface. However, the electrochemical formed irreversible Ru hydrate dioxide (RuOxHy) shows better coverage of Cu UPD. The conductive Ru oxides are directly plateable liner materials as potential diffusion barriers for the IC fabrication. The part II of this dissertation demonstrates the development of a new rapid corrosion screening methodology for effective charac

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18

Honorato, Ana Maria Borges. "Conductive Polymers Derived Heteroatom Doped Carbon Catalysts forOxygen Reduction Reaction." Case Western Reserve University School of Graduate Studies / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=case1607446593560503.

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19

ZAGO, STEFANO. "Fe-N-C electrocatalysts from waste biomass for the oxygen reduction reaction." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2967851.

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20

Zhang, Qiang. "Probing the Active Site of CNx Catalysts for the Oxygen Reduction Reaction in Acidic Media: A First-Principles Study." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1531312924087566.

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21

Thobeka, Adonisi. "Electrochemical characterization of platinum based catalysts for fuel cell applications." Thesis, University of the Western Cape, 2012. http://hdl.handle.net/11394/3812.

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Magister Scientiae - MSc<br>Fuel cells convert chemical energy from a fuel into electricity through chemical reaction with oxygen. This possesses some challenges like slow oxygen reduction reaction (ORR), overpotential, and methanol fuel cross over in a direct methanol fuel cell (DMFC). These challenges cause inefficiency and use of higher amounts of the expensive platinum catalyst.Several binary catalysts with better ORR activity have been reported. In this study we investigate the best catalyst with better ORR and MOR performances and lower over-potentials for PEMFC and DMFC applications b

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22

Henning, Sebastian, Laura Kühn, Juan Herranz, et al. "Effect of Acid Washing on the Oxygen Reduction Reaction Activity of Pt-Cu Aerogel Catalysts." Elsevier, 2018. https://www.sciencedirect.com/science/article/pii/S001346861730484X.

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Developing highly active and durable oxygen reduction reaction (ORR) catalysts is crucial to reduce the cost of polymer electrolyte fuel cells (PEFCs). To meet those requirements, unsupported Pt-Cu alloy nanochains (aerogels) were synthesized by a simple co-reduction route in aqueous solution and their structure was characterized by X-ray absorption spectroscopy and STEM-EDX. These catalysts exceeded the ORR activity of commercial Pt/C catalysts by more than 100 % in RDE experiments and met the US DOE targets, thereby qualifying as very promising materials. The behavior of Pt-Cu aerogels under

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23

Ryösä, Elin. "Mineral Reactions and Slag Formation During Reduction of Olivine Blast Furnace Pellets." Doctoral thesis, Uppsala universitet, Institutionen för geovetenskaper, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-9389.

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The present work focuses on mineral reactions and slag formation of LKAB olivine iron ore pellets (MPBO) subjected to reducing conditions in the LKAB experimental blast furnace (EBF). The emphasis is on olivine reactions with surrounding iron oxides. Many factors influence the olivine behaviour. The study was performed by use of micro methods; optical microscopy, micro probe analysis, micro Raman and Mössbuer spectroscopy and thremodynamic modeling. During manufacturing, in oxidising atmosphere at high temperature (1350°C), olivine alterations occur through slag formation and rim reactions wit

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24

Kashyap, V. "High-performance Pt-free oxygen reduction reaction electrocatalysts derived from carbon supported spinel cobalt ferrite and Co/Fe-nitrogen coordinated active centers for advanced energy applications." Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2019. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/4595.

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Although the metal oxides are capable of displaying interesting catalytic activity characteristics, the intrinsic activities of these types of systems are found to be largely depending on other parameters such as particle size, morphology, and how well the catalyst particles are dispersed on a conducting substrate and additionally the surface intermediates involved in the process. Herein, we have explored the close relation of particle size, dispersion characteristics of the active particles on a conducting carbon, substitution effect of other metals and controlled interplay of the surface int

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25

Cameron, Rory. "Bioleaching of low-grade nickel sulphide ore at elevated pH." Thesis, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19784.

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This thesis examines the bioleaching of six different Canadian nickel sulphide ores at pH levels above what is generally considered optimum (~ 2). The majority of work discussed in this thesis was conducted with a low-grade metamorphosed ultramafic nickel sulphide ore from Manitoba, Canada (Ore 3), which is not currently exploitable with conventional technologies. The ore contains 21% magnesium and 0.3% nickel. Nickel is the only significant metal value, and is present primarily as pentlandite. A substantial fraction of the magnesium is present as the serpentine mineral lizardite, making proce

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26

Perazzolo, Valentina. "NITROGEN, SULPHUR AND PLATINUM FUNCTIONAL MESOPOROUS CARBONS: SYNTHESIS, CHARACTERIZATION AND PERFORMANCE TOWARD OXYGEN REDUCTION REACTION." Doctoral thesis, Università degli studi di Padova, 2017. http://hdl.handle.net/11577/3424872.

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Proton Exchange Membrane (PEM) Fuel Cells are a promising technology for the clean energy production, especially in the automotive field. Actually, the main commercial catalysts employed in this system are based on Pt Nanoparticles supported on high surface area Carbon. The main issues associated to PEM Fuel Cells deal with the sluggish kinetic of oxygen reduction (ORR) at Platinum based electrode, with the low stability of both the carbon support and the metal phase, that tend respectively to oxidize and dissolve or diffuse and with the high cost due to rare and expensive Pt. In fact, nowaday

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27

Ghazali, Omer Muftah al [Verfasser]. "Development of new packed reactor using TiO2 pellet for drinking water treatment / Muftah Al-Ghazali Omer." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2012. http://nbn-resolving.de/urn:nbn:de:gbv:089-7237722237.

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28

Omer, Muftah Al-Ghazali [Verfasser]. "Development of new packed reactor using TiO2 pellet for drinking water treatment / Muftah Al-Ghazali Omer." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2012. http://d-nb.info/1029590176/34.

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29

Haider, Syed Kumail. "Oxygen carrier and reactor development for chemical looping processes and enhanced CO2 recovery." Thesis, Cranfield University, 2016. http://dspace.lib.cranfield.ac.uk/handle/1826/10014.

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This thesis’s main focus is a CO2 capture technology known as chemical looping combustion (CLC). The technology is a novel form of combustion and fuel processing that can be applied to gas, solid and liquid fuels. By using two interconnected fluidised-bed reactors, with a bed material capable of transferring oxygen from air to the fuel, a stream of almost pure CO2 can be produced. This stream is undiluted with nitrogen and is produced without any direct process efficiency loss from the overall combustion process. The heart of the process is the oxygen carrier bed material, which transfers oxyg

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30

Zhao, Chengyuan. "Effect of Temperature on Biogas Production in Anaerobic Treatment of Domestic Wastewater UASB System in Hammarby Sjöstadsverk." Thesis, KTH, VA-teknik, Vatten, Avlopp och Avfall, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95415.

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The upflow anaerobic sludge blanket (UASB) reactor is widely used around the world to treat variety of domestic andindustrial wastewater with three main advantages: production of biogas as renewable energy, no need of support structure for development of microorganisms and high rate treatment efficiency with low rate of biomass production. This study evaluates the effect of temperature on biogas production and CODtotal removal in Line 4-UASB system treating domestic wastewater in Hammarby Sjöstadsverk. Eight parameters were examined including the following: Influent and effluent temperature, p

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31

Pfeifer, Verena [Verfasser], Robert [Akademischer Betreuer] Schlögl, Robert [Gutachter] Schlögl, Peter [Gutachter] Strasser, and Hans-Peter [Gutachter] Steinrück. "Identification of reactive oxygen species in iridium-based OER catalysts by in situ photoemission and absorption spectroscopy / Verena Pfeifer ; Gutachter: Robert Schlögl, Peter Strasser, Hans-Peter Steinrück ; Betreuer: Robert Schlögl." Berlin : Technische Universität Berlin, 2017. http://d-nb.info/1156015952/34.

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32

Pietrasz, Patrick. "Investigation of the ORR at PEM Fuel Cell Electrodes: Catalysis, Pulse Voltammetry & High Temperature Applications." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1263335739.

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Thesis (Doctor of Philosophy)--Case Western Reserve University, 2010<br>Department of Chemical Engineering Title from PDF (viewed on 2010-05-25) Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center

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33

Briega-Martos, Valentín. "Unraveling the oxygen reduction reaction mechanism: occurrence of a bifurcation point before hydrogen peroxide formation." Doctoral thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10045/102311.

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En la presente tesis doctoral se realiza un estudio detallado sobre el mecanismo de la reacción de reducción de oxígeno (ORR) en electrodos monocristalinos de platino. Para ello, se han realizado medidas electroquímicas usando la configuración de electrodo rotatorio de menisco colgante (HMRDE) con superficies con distinta estructura superficial y variando condiciones de la disolución de trabajo como el pH, fuerza iónica o la ausencia o presencia de bromuros. La conclusión principal que se extra de estos experimentos es la posibilidad de la existencia de un punto de bifurcación en el mecanismo,

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34

PEZZOLATO, LORENZO. "Fe-N-C non-noble catalysts for applications in Fuel Cells and Metal Air Batteries." Doctoral thesis, Politecnico di Torino, 2020. http://hdl.handle.net/11583/2809320.

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35

Wermann, Silke. "Analytik von phenolischen Substanzen und Epoxiden in Materialien mit Lebensmittel- und/oder dermalem Kontakt." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1228839995955-73499.

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Ein Großteil der Lebensmittel wird in der heutigen Zeit vor allem aufgrund ihrer langen Haltbarkeit in Konservendosen verpackt. Zur Qualitätserhaltung des Lebensmittels werden Weißblechdosen im Innenbereich in der Regel mit einer Lackierung versehen. Lackrohstoffe sind dabei u. a. Phenol- und Epoxidharze, die als Basis- oder Vernetzerkomponente eingesetzt werden. Bei der Herstellung und Lagerung dieser Lebensmittel kann jedoch nicht ausgeschlossen werden, dass es zur Migration von Bestandteilen aus der Kunststoffinnenbeschichtung in das Füllgut kommt. Toxikologisch und somit auch analytisch si

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36

Ricker, Justin T. "Inhibition of OV2008 Cancer Cell Proliferation in the Presence of Oleoylethanolamide, JW480 and Chlorpyrifos-oxon." Kent State University Honors College / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1450797277.

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37

Ryabova, Anna. "Électrocatalyse de la réduction de l'oxygène et du peroxyde d'hydrogène sur les oxydes de manganèse." Thesis, Strasbourg, 2018. http://www.theses.fr/2018STRAF011/document.

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Les oxydes de manganèse présentent un grand intérêt en raison de leur activité catalytique pour l'ORR (la réaction de réduction de l’oxygène) en milieu alcalin et peuvent être utilisés comme matériaux sans métaux nobles pour la cathode dans les piles à combustible. La présente thèse est consacrée à l’étude de l’activité d'oxydes de manganèse pour l’ORR. Il a été montré que Mn2O3 avec structure bixbyite a une meilleure activité catalytique vers l'ORR en milieu alcalin que les autres oxydes de manganèse étudiés. L'activité spécifique de Mn2O3 est seulement 4 fois inférieure à celle de Pt à une s

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38

Chapala, Usha Kiran, and Sridhar Peteti. "Continuous Video Quality of Experience Modelling using Machine Learning Model Trees." Thesis, Blekinge Tekniska Högskola, Institutionen för datavetenskap, 1996. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17814.

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Adaptive video streaming is perpetually influenced by unpredictable network conditions, whichcauses playback interruptions like stalling, rebuffering and video bit rate fluctuations. Thisleads to potential degradation of end-user Quality of Experience (QoE) and may make userchurn from the service. Video QoE modelling that precisely predicts the end users QoE underthese unstable conditions is taken into consideration quickly. The root cause analysis for thesedegradations is required for the service provider. These sudden changes in trend are not visiblefrom monitoring the data from the underlyi

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Soustelle, Vincent. "Interactions entre déformation et percolation de magma ou de fluide dans le manteau à l'aplomb des zones de subduction." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20151/document.

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Ce travail apporte de nouvelles contraintes sur les interactions entre déformation et processus d'hydratation et de percolation de magma ou de fluides et leurs implications sur les propriétés sismiques dans le coin mantellique. Il se base sur l'analyse de péridotites à spinelle provenant du massif de Ronda (Espagne) et deux séries de xénolites issues de zones de subduction actives (Kamchatka, Papouasie-Nouvelle-Guinée). L'étude structurale, pétrologique et géochimique de ces échantillons montrent qu'ils ont subi une percolation réactive de magma ou de fluide synchrone d'une déformation de haut

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Kamarajugadda, Sai K. "Advanced Models for Predicting Performance of Polymer Electrolyte Membrane Fuel Cells." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1323758118.

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Hanana, Manel. "Fonctionnalisation de nanotubes de carbone par une approche non covalente pour l'électrocatalyse et l'optoélectronique." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASF005.

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La fabrication de matériaux hybrides, combinant sans les altérer les propriétés de leurs différents constituants, est au cœur de la recherche en nanosciences. Parmi les différents types de nanomatériaux envisagés à cette fin, les nanotubes de carbone sont des objets prometteurs en raison de leurs propriétés optiques, de conductivité et de leur fonctionnalisation, pour la catalyse, l’électronique et l’optoélectronique. Dans la première partie de cette thèse, des structures hybrides supramoléculaires à base de nanotubes de carbone multi-parois et de macrocycles (porphyrines, phtalocyanine ou cor

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Batalha, Nuno Miguel Rocha. "Optimization of the balance between activity and selectivity on a hydroisomerization catalyst." Thesis, Poitiers, 2012. http://www.theses.fr/2012POIT2268/document.

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Un des principaux défis lors de l'élaboration des catalyseurs adéquats pour le procédé de déparaffinage catalytique (hydroisomérisation) est de maximiser le rendement en isomères et l'activité du catalyseur, tout en maintenant une faible sélectivité en produits de craquage. En effet, des catalyseurs avec sélectivité de forme à base de zéolithes à taille de pore intermédiaire, par exemple Pt/ZSM-22, sont sélectives en isomères, tandis que les zéolithes à large pore sont plus actifs, mais moins sélectif. L'objectif principal de cette thèse était, alors, d’étudier et de développer un catalyseur à

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Odobasic, Dennis, and Marcel Mysliwiec. "Immunhistokemisk undersökning av slemhinnepemfigoid och orala lichenoida reaktioner med epitelsläpp - En pilotstudie." Thesis, Malmö universitet, Odontologiska fakulteten (OD), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-19749.

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Syfte: Är att ta reda på om man med hjälp av immunhistokemi (IHC) med infärgning avantikroppar mot laminin-5 och C3d kan särskilja mellan slemhinnepemfigoid (MMP) ochorala lichenoida reaktioner (OLR) med epitelsläpp. Vidare undersöks graden inflammation för MMP och OLR för att fastställa om det går att se ett samband mellan grad av inflammation och antikroppsinfärgning.Material och metod: En pilotstudie utfördes på 10 prover med diagnosen MMP respektive 9 prover med OLR, som hämtades från Malmö universitets biobank. Proverna genomgickrutinfärgning respektive antikroppsinfärgning mot laminin-5

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Pretorius, Rachelle Ann. "Body composition and systematic low-grade inflammation in children : the PLAY study / Rachelle A. Pretorius." Thesis, North-West University, 2006. http://hdl.handle.net/10394/1096.

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Background: Obesity-related diseases are arising as a major problem among children. inflammation has recently been identified to play an important role in the relationship between obesity.- as well as stunting-related diseases. Objectives: The aim of this study was to assess the association between serum tumour necrosis factor-alpha (TNF-α), interleukin-6 (IL-6) and C-reactive protein (CRP) concentrations and a variety of cardiometabolic and anthropometric indices of children in a township outside Potchefstroom, South Africa. Methods: Blood samples of 115 girls and 78 boys (mean age 15.6 ± 1.3

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Hovorka, Christopher Francis. "Influencing motor behavior through constraint of lower limb movement." Diss., Georgia Institute of Technology, 2015. http://hdl.handle.net/1853/54903.

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Limited knowledge of the neuromechanical response to use of an ankle foot orthosis-footwear combination (AFO-FC) has created a lack of consensus in understanding orthotic motion control as a therapeutic treatment. Lack of consensus may hinder the clinician’s ability to target the motion control needs of persons with movement impairment (e.g., peripheral nerve injury, stroke, etc.). Some evidence suggests a proportional relationship between joint motion and neuromuscular activity based on the notion that use of lower limb orthoses that constrain joint motion may invoke motor slacking and decrea

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Reis, Jonas Batista. "Estudo da atividade eletrocatalítica de óxidos nanoestruturados de Ru, Ir, Hf e La visando o estudo da reação de redução de oxigênio (RRO)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-09112015-160257/.

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Neste trabalho foi estudada a atividade eletrocatalítica dos eletrocatalisadores nanoestruturados de Ru, Ir, Hf ou La suportados em carbono Printex 6L frente à Reação de Redução de Oxigênio (RRO) em meio ácido. Inicialmente analisou-se a influência do Método de Impregnação e dos Precursores Poliméricos (MPP), também conhecido como Pechini para os eletrocatalisadores RuO2/C e IrO2/C. Ficou evidente neste estudo, que os materiais obtidos pelo MPP apresentaram uma maior eficiência de corrente para a eletrogeração de H2O2 quando comparado ao método da Impregnação. Na etapa seguinte, os eletrocatal

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Roederer, Jeanne. "Influence du potassium sur les mécanismes des différentes étapes de réduction de l'hématite (synthétique et naturelle) en wuestite saturée en fer." Nancy 1, 1986. http://www.theses.fr/1986NAN10018.

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Étude cinétique par thermogravimétrie dans CO-CO::(2) dans une large gamme de température, sur cristaux synthétiques et sur un minerai d'hématite à gangue siliceuse. Rôle de K sur la germination et la croissance de la magnétite interprété par la formation transitoire de KFE::(11)O::(17), dont l'épitaxie sur FE::(2)O::(3) est à priorité facile. Le dopage de K par BA montre que K intervient par sa taille et non par sa charge. Dans le cas du minerai, l'action de K est minimisée par la silice

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Gong, Minhui. "Etude des électrodes sur batterie zinc-air." Electronic Thesis or Diss., Université Paris sciences et lettres, 2021. http://www.theses.fr/2021UPSLC024.

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La batterie zinc-air devient une alternative potentielle à la batterie lithium-ion en raison de son avantage en termes de ressources, de sa densité d'énergie théorique élevée et de son faible potentiel de risque pour la sécurité. Ce travail met l'accent sur les problèmes conventionnels impliquant à la fois l'électrode à zinc et à air, visant à l'application.Pour l'électrode de zinc, deux configurations maison sont utilisées pour étudier la croissance des dendrites de zinc et l'évolution de l'hydrogène pendant le dépôt avec un électrolyte statique et en flux, respectivement. On trouve qu'une co

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Morcinková, Lenka. "Totální produktivní údržba (TPM) ve firemní praxi." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402516.

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Master’s thesis is concerned with maintenance management in manufacturing companies focusing on TPM. The first part of the thesis deals with the topic theoretically and proposes possible solution in company Siemens Electric Machines s.r.o. based on system analysis. The practical part then describes the current state of maintenance management and recommend various measures to improve autonomous, scheduled and reactive maintenance in this company.

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Cognard, Gwenn. "Electrocatalyseurs à base d’oxydes métalliques poreux pour pile à combustible à membrane échangeuse de protons." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI007.

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Les électrocatalyseurs conventionnels utilisés dans les piles à combustibles à membrane échangeuse de protons (PEMFC) sont composés de nanoparticules de platine supportées sur des noirs de carbone de forte surface spécifique. A la cathode de la PEMFC, siège de la réaction de réduction de l’oxygène (ORR), le potentiel électrochimique peut atteindre des valeurs élevées - notamment lors de phases arrêt-démarrage - engendrant des dégradations irréversibles du support carboné. Une solution « matériaux » consiste à remplacer ce dernier par des supports à base d’oxydes métalliques. Ceux-ci doivent êt

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