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Dissertations / Theses on the topic 'Orr'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Blanchard, Rémi. "Redox shuttle and positive electrode protection for Li-O2 systems." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAI098/document.

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Les travaux de cette thèse focalisent sur la résolution de deux problèmes majeurs des électrodes positives de systèmes Li-O2, dus à la nature du produit de décharge formé pendant la réaction de réduction de l'oxygène, en milieux Li+ : Lithium peroxyde (Li2O2). Le premier problème est lié au processus de formation de ce dernier (étapes successives de nucléation électrochimiques et de dismutation chimique d'un intermédiaire : le superoxide de lithium), qui conduit à la formation de très grosses particules de peroxyde lithium à la surface de l'électrode. Du fait de leurs taille et de leur résisti

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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

Pasqualeti, Aniélli Martini. "Eletrocatalisadores formados por nitretos, carbetos e óxidos metálicos para o eletrodo de oxigênio." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/75/75134/tde-14062017-102848/.

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O desenvolvimento de eletrocatalisadores eletricamente condutores com alta atividade para a reação de redução de oxigênio (ORR - Oxygen Reduction Reaction) e desprendimento de oxigênio (OER - Oxygen Evolution Reaction) é de extrema importância e interesse para dispositivos de eletro-conversão de energia, como as células a combustível e eletrolisadores, que operam tanto em meio alcalino quanto ácido. Em meio alcalino, é possível o uso de metais não nobres e, assim, são viáveis para o uso em larga escala. Em meio ácido, é necessário o uso de materiais estáveis, uma vez que eles são expostos a um

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4

Bost, Pouderon Cécile. "Dion Chrysostome : trois discours aux villes (Orr. 33-35) /." Salerno : Helios, 2006. http://catalogue.bnf.fr/ark:/12148/cb41025346c.

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5

Scorgie, Glen G. "A call for continuity : the theological contribution of James Orr." Thesis, University of St Andrews, 1986. http://hdl.handle.net/10023/2738.

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James Orr (1844-1913) was a Scottish theologian, apologist and polemicist. He was the leading United Presbyterian theologian at the time of the United Free Church of Scotland union of 1900, and beyond his own church and nation he came to exercise a significant influence in North America. This study is an examination of Orris theological contribution, what he believed and how he expressed it, in its historical setting Particular attention is paid to the convictions which undergirded and gave impetus to his activities. The study reveals that while Orr was far from unaffected by the intellectual

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6

Shanthini, Rajaratnam. "Degenerating Orr-Sommerfeld eigenmodes and development of three-dimensional perturbations." Doctoral thesis, Luleå tekniska universitet, 1990. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16792.

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Degeneracies of temporally damped Orr-Sommerfeld eigenmodes are studied primarily for plane Poiseuille flow. The discrete spectrum of the eigenmodes is shown to possess infinitely many degeneracies, each appearing at a certain combination of k (the modulus of resultant wavenumber) and α R (the streamwise wavenumber times the Reynolds number). The streamwise phase velocities of the degeneracies are close to about 2/3 of the centreline velocity, and their damping rates decrease with increasing Reynolds number. Interestingly, several degeneracies axe operative even at sub-transitional Reynolds nu

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7

Markiewicz, Shannon Colleen. "Nonparametric Inference Using Order Restricted Randomized Designs." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1221750077.

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8

Brudnicki, Adam. "Rozwój morfologiczno-czynnościowy przewodu pokarmowego kurcząt szczepionych in ovo prebiotykiem ORR." Rozprawa doktorska, [Nakł.aut.], 2012. http://dlibra.utp.edu.pl/Content/569.

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Celem rozprawy było określenie wpływu pojedynczej iniekcji in ovo prebiotyku ORR na rozwój morfologiczno-czynnościowy przewodu pokarmowego kurcząt w poszczególnych dniach eksperymentu przeprowadzonego w warunkach fermowych

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9

Hoelscher, David W. "Cultivating the Ecological Conscience: Smith, Orr, and Bowers on Ecological Education." Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc12133/.

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During the past two decades, one of the positive developments in academia has been the emergence of a sizable literature pertaining to ecological education-the theory and practice of preparing children and adults alike for ecologically responsible citizenship. Gregory A. Smith, David W. Orr, and C. A. Bowers are three of the more prolific writers in the field. Smith critiques modern primary and secondary education and argues for, and paints a picture of, an alternative "green pedagogy" that seeks to inculcate in students strong community and ecological values. Orr focuses on the social and

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10

Hoelscher, David Wayne Hargrove Eugene C. "Cultivating the ecological conscience Smith, Orr, and Bowers on ecological education /." [Denton, Tex.] : University of North Texas, 2009. http://digital.library.unt.edu/ark:/67531/metadc12133.

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11

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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12

Matsutsu, Molefi. "DFT insight into the oxygen reduction reaction (ORR) on the Pt₃Co(111) surface." Master's thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/22066.

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Proton exchange membrane fuel cells (PEMFC) are identified as future energy conversion devices, for application in portable and transportation devices. The preferred catalyst for the PEMFC is a Pt-catalyst. However, due to the slow oxygen reduction reaction (ORR) kinetics, high Pt loadings have to be used. The high Pt loadings lead to high costs of the PEMFC. Pt-Co alloys have been identified as catalysts having higher ORR activity higher than of a Pt-catalyst. Therefore, in the present study, the Density Functional Theory (DFT) technique is used to gain fundamental insight into the ORR on the

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13

Dentel, Patricia. "Traitement chirurgical du prolapsus rectal par les techniques d'Orr-Loygue et de Delorme : résultats à propos de 57 observations." Université Louis Pasteur (Strasbourg) (1971-2008), 1993. http://www.theses.fr/1993STR1M170.

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14

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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15

Shi, Zhangsheng. "Strain engineering of Co-N-C catalyst toward enhancing the HER and ORR electrocatalytic activities." Thesis, Queensland University of Technology, 2020. https://eprints.qut.edu.au/207078/8/Zhangsheng_Shi_Thesis.pdf.

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This thesis presents a comprehensive review of practical strategies to enhance the catalytic activity of M-N-C materials. The practical strategies can be extended to engineer external factors to break the linear scaling relationships and to further enhance the catalytic performances. In order to design the next-generation higher-performance catalysts, this project was a step forward in developing strain and heterostructure method to achieve a superior HER performance and a ORR performance beyond the limit.

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16

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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17

Hildon, Zoe Jane-Lara. "Resilience and quality of life at older ages : mixed methods analysis of the Boyd Orr Cohort." Thesis, Imperial College London, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503814.

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18

Eckardt, Markus [Verfasser]. "ORR activity and stability of Pt-based and Pt-free catalysts for PEMFC applications / Markus Eckardt." Ulm : Universität Ulm, 2020. http://d-nb.info/1203716257/34.

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19

Martin, Richard Michael. "Early nutritional infuences on later health : breastfeeding and cardiovascular disease risk : the Boyd Orr cohort study." Thesis, University of Bristol, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409433.

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20

Greenlee, Christine Lund Koch. "The Constantian orations : a contextual analysis of self-presentation in Libanius' 'Orr.' 59, 11, 61 and 31." Thesis, University of St Andrews, 2017. http://hdl.handle.net/10023/15923.

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A total of sixty-four orations survive from the hand of Libanius. Four of these speeches were delivered under the reign of Constantius II (AD 337-361) and thus form a distinct chronological cluster in the Libanian corpus. The Constantian orations include Or. 59 To Constantius II and Constans (AD 346-9), Or. 11 The Antiochikos (AD 356), Or. 61 Monody on Nicomedia (AD 358), and Or. 61 For the teachers (AD 360-1). This study adopts a diachronic approach and analyses the historical and literary context of each Constantian oration with a particular focus on Libanius' self- presentation. The study s

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21

Pernice, Jean-Laurent. "Principes et indications du traitement chirurgical du prolapsus rectal de l'adulte suivant la technique de Orr-Loygue." Montpellier 1, 1988. http://www.theses.fr/1988MON11162.

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22

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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23

Olson, Ted. "Book Review of Fiona Ritchie and Doug Orr: Wayfaring Strangers: The Musical Voyage from Scotland and Ulster to Appalachia." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etsu-works/1176.

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24

Augustin, Matthias [Verfasser], Jürgen [Akademischer Betreuer] Parisi, and Matthias [Akademischer Betreuer] Busse. "The electrocatalytic ORR activity of nanostructured manganese oxides in aprotic media / Matthias Augustin. Betreuer: Jürgen Parisi ; Matthias Busse." Oldenburg : BIS der Universität Oldenburg, 2015. http://d-nb.info/1076366414/34.

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25

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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26

Lahmann, Jan-Rainer [Verfasser]. "Eine Methode zur Einschließung von Eigenpaaren nichtselbstadjungierter Eigenwertprobleme und ihre Anwendung auf die Orr-Sommerfeld-Gleichung / Jan-Rainer Lahmann." Karlsruhe : KIT-Bibliothek, 1999. http://d-nb.info/1013829174/34.

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27

Orr, Miranda Ethel. "Mouse and stem cell models of frontotemporal dementia." Diss., Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/orr/OrrM0512.pdf.

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Alzheimer's disease (AD) is the most prevalent brain disease in the United States, and an escalating health concern. AD patient brains acquire hallmark protein aggregates, referred to as senile A beta plaques and neurofibrillary tangles (NFTs), that coincide with brain cell loss and dementia. A subset of AD patients carry mutant genes. Our understanding of AD largely relies on model systems that express these gene variants. Mice engineered to express AD-mutant human genes develop A beta plaques, but fail to develop the tau-containing NFTs or cell loss. Mutant tau variants are required to induc

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28

Orr, Kimberley R. "Bridges to Science: effects of a science outreach program on high school students' understanding of science concepts." Montana State University, 2012. http://etd.lib.montana.edu/etd/2012/orr/OrrK0812.pdf.

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Many of my students are not prepared for postsecondary education because they feel unprepared in terms of experience and knowledge. This project focused on evaluating the impact the Bridges to Science outreach program had on students' understanding of science concepts. Students' level of understanding, attitude and motivation, and thoughts about science careers were considered as well. This project also investigated the impact on classroom teachers' professionalism, on the program staffs' pedagogy, and on my own professionalism and involvement with the program. The Bridges to Science program o

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29

Gennaro, Elmer Mateus. "Análise da instabilidade hidrodinâmica de uma esteira assimétrica." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18148/tde-22042008-112415/.

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Em uma aeronave, dispositivos de hiper-sustentação à altos ângulos de ataque promovem a formação de esteiras. Tais esteiras influenciam o desempenho aerodinâmico. A esteira do eslate, por exemplo, afeta o ponto de transição do elemento principal da asa e é a fonte de ruído mais importante na estrutura do avião. Devido a geração de sustentação estas esteiras são assimétricas. Corpos imersos em escoamento cisalhante também produzem esteiras assimétricas, com importantes aplicações para a indústria petrolífera. Existem aspectos de tais escoamentos que precisam de investigação. Por exemplo, não há

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30

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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31

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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32

González-Gaitán, Carolina. "Electrochemically modified carbon materials for applications in electrocatalysis and biosensors." Doctoral thesis, Universidad de Alicante, 2016. http://hdl.handle.net/10045/64350.

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33

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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34

Gambu, Thobani G. "The mobility of oxygen containing species (OCS*) over Pt-based catalyst surfaces: Impact on the oxygen reduction reaction (ORR) activity." Doctoral thesis, Faculty of Engineering and the Built Environment, 2021. http://hdl.handle.net/11427/32705.

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The growing need to curb greenhouse gas emissions has made low-temperature proton exchange membrane fuel cells (PEMFCs) more attractive for automotive application. One of the major problems facing PEMFCs is the sluggish kinetics of the oxygen reduction reaction (ORR). To further enable wide-scale commercialisation of PEMFCs for automotive applications, major improvements in the ORR catalyst are therefore needed. An in depth understanding of the ORR mechanism over Pt surfaces can enable rational approaches in the search for more active ORR catalysts. The ORR occurs over multi-faceted Pt nanopar

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35

FERRARA, MARCELLO. "Elettrocatalizzatori nanostrutturati per l'attivazione di piccole molecole." Doctoral thesis, Università degli Studi di Trieste, 2022. http://hdl.handle.net/11368/3030041.

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Nell’era moderna la richiesta di elettricità è cresciuta lentamente ma inesorabilmente, mentre è divenuta la forma di energia più importante per il progresso scientifico. I sistemi di accumulo e conversione sono in particolare oggetto di molti studi, sin dalle prime ratifiche di accordi internazionali sulla crisi climatica (per primi i protocolli di Kyoto). Data la natura limitata e “sporca” dei combustibili fossili (la loro combustione non solo libera CO2, ma anche polveri sottili e gas acidi come ossidi di zolfo e azoto), la ricerca si sta concentrando in altre tecnologie, come ad esempio le

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36

Van, der Fort Zareer. "A numerical investigation of the linear hydrodynamic stability of Newtonian and weakly non-Newtonian channel flows as described by the Orr-Sommerfeld equation." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/4940.

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Includes abstract.<br>Includes bibliographical references (leaves 106-112).<br>The Orr-Sommerfeld equation describes the growth of infinitesimal disturbances to laminar solutions of the Newtonaian Navier-Stokes equations. In this dissertation we consides in part idealised flows between two parallel planes of infinite extent and a finite distance apart. They are referred to as closed channel flows.

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37

Gambu, Gorden Thobani. "A DFT study of the interaction of Ox with Pt nanorod edge sites : a model for the ORR activity on Pt nanoparticle edges." Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/20054.

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Proton exchange membrane fuel cells (PEMFCs) are an attractive energy conversion technology, this due to their high theoretical fuel utilization efficiencies compared to Carnot engines. However, due to potential losses, the operational efficiencies achieved in state-of-the-art PEMFCs are only between 45% and 55%. The slow kinetics of the oxygen reduction reaction (ORR) over a platinum based electrode accounts for ca. 70% of the potential losses. As a result of the sluggish ORR kinetics, high platinum loadings are required. The high cost of platinum has made it crucial to improve the ORR activi

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38

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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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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40

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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41

Baraniuk, Caroline Patricia. "'as native in my thought as any here' A revisionist Re-Reading of the Life and Works of James Orr: Poet, Patriot and Ulster Scot." Thesis, University of Glasgow, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500275.

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42

Shomroni, Orr [Verfasser], Stefan [Akademischer Betreuer] [Gutachter] Bonn, and Stephan [Gutachter] Waack. "Development of algorithms and next-generation sequencing data workflows for the analysis of gene regulatory networks / Orr Shomroni ; Gutachter: Stefan Bonn, Stephan Waack ; Betreuer: Stefan Bonn." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2017. http://d-nb.info/1129956350/34.

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43

Biz, Chiara. "Electronic and magnetic factors in the design of optimum catalysts for hydrogen fuel cells." Doctoral thesis, Universitat Jaume I, 2022. http://dx.doi.org/10.6035/14104.2022.709278.

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Fuel cells represent one of the most promising energy storage system nowadays. Nonetheless, several obstacles need to be overcome in order to commercially exploit this technology. One of them lies in the efficiency loss due to the overpotential of the oxygen reduction reaction (ORR). Thus, during the last decades, researchers have mainly focused on finding optimum solid catalyst(s) with the following profile: good ORR activity, good stability under the operating FC conditions, inexpensive, widely available and environmentally friendly. Magnetic catalysts, based on 3d-metals such as Pt-based al

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44

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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45

Isidoro, Roberta Alvarenga. "Desenvolvimento de eletrocatalisadores de PdM (M= Ni, Cu, Ag) para reação de redução de oxigênio em meio básico na ausência e presença de álcool." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/85/85134/tde-15022016-135848/.

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Eletrocatalisadores baseados em Pd/C, PdCu/C, PdNi/C e PdAg/C foram produzidos pelo método de micro-ondas para serem utilizados como cátodo na célula a combustível alcalina na ausência e presença de álcool. Este método se mostrou bastante efetivo para a produção dos materiais, uma vez que as partículas apresentaram boa dispersão no suporte de carbono e produziram eletrocatalisadores com tamanho de partícula em torno de 3,5 nm, de acordo com as análises de DRX e MET. A partir das voltametrias cíclicas observa-se que para os eletrocatalisadores de PdCu/C e PdNi/C quanto maior a quantidade de Cu

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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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47

Poux, Tiphaine. "Study of the oxygen reduction on perovskite-type oxides in alkaline media." Thesis, Strasbourg, 2014. http://www.theses.fr/2014STRAF001/document.

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La cinétique lente de la réduction de l’oxygène (ORR) est en grande partie responsable de la perte d’énergie de nombreux systèmes de conversion tels que les piles à combustible. Parmi les possibles catalyseurs de l’ORR, les oxydes de type pérovskite sont des candidats prometteurs en milieu alcalin. La présente thèse est consacrée à l’étude de l’activité, du mécanisme et de la stabilité de pérovskites à base de Co et Mn pour l’ORR. Grâce aux techniques d’électrode tournante à disque et disque-anneau (R(R)DE), les études de l’ORR et des transformations d’HO2- sur les couches minces de pérovskite

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Brandiele, Riccardo. "Synthesis and characterization of materials for PEM-FC, based on Pt alloyed nanoparticles supported on next generation mesoporous carbon." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3422707.

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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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Schaedel, Karin, and Tommy Söderberg. "Automatisk överföring av analog data från pappersenkäter till digital databas på Karolinska Universitetssjukhuset Huddinge." Thesis, KTH, Medicinteknik och hälsosystem, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277627.

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På Karolinska Universitetssjukhuset Huddinge har en stor mängd knäprotesoperationsenkäter staplats på hög under två år. Svaren från dessa ska konverteras till digitalt format så dessa kan lagras i databasen REDCap för att kunna utföra kvalitetskontroll och prospektiv uppföljning i flera år. För att spara arbetstid efterfrågades ett program som kunde läsa in enkätsvaren automatiskt. I detta projekt skapades ett program i MATLAB med målsättning att klara av att läsa enkätmarkeringar samt minst 70 % av personnumren. Dessa personnummer skulle sedan läggas in i ett Excel-ark

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Scibilia-Cocheril, Marie-Françoise. "Contribution a l'etude des jets parietaux." Paris 6, 1986. http://www.theses.fr/1986PA066539.

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Definition des caracteristiquees du jet parietal. Historique du sujet. Theorie de glauert permettant l'existence d'une solution semblable selon laquelle la forme des profils de vitesse dans chaque section du jet reste inchangee le long du jet. Etude de la stabilite lineaire et non lineaire. Resolution de l'equation d'orr-sommerfeld en theorie temporelle et en theorie spatiale. Etude experimentale: mesure des vitesses en presence d'un corps bidimensionnel ou tridimensionnel, mesures de temperature

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