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Tesi sul tema "Pt"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 25 luglio 2025

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1

Paulino, Marcia Elizangela. "\"Estudo da reação de eletro-oxidação de metanol sobre eletrodos monocristalinos de platina modificados com eletrodepósitos de cobre e estanho\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-12042007-094545/.

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Abstract (sommario):
A eletro-oxidação de metanol foi estudada em eletrodos de platina monocristalina de índices de Miller (100) e (111) modificados superficialmente com metais cobre e estanho nas condições de UPD (Underpotential Deposition) e OPD (Overpotential Deposition). Os experimentos foram conduzidos em EDRMP (Eletrodo de Disco Rotatório com Menisco Pendente) em conjunto com as técnicas eletroquímicas. Os depósitos de cobre foram realizados em condições de UPD e OPD enquanto que estanho em OPD, dada as limitações de rearranjo estrutural da superfície cristalográfica do eletrodo. As análises dos resultados i
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2

Макаренко, К. В. "Високочутливий газовий сенсор на основі тришарової плівки Pt/TiO2/Pt". Master's thesis, Сумський державний університет, 2020. https://essuir.sumdu.edu.ua/handle/123456789/82015.

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Мета роботи полягає у аналізі особливостей при розробці конструкції високочутливого напівпровідникового газового сенсору на основі тришарової плівки Pt/TiO2/Pt, у тому числі і на підкладці із гнучкого матеріалу, а також у вивченні його технічних характеристик, в тому числі при дії різних факторів. У роботі описані та проаналізовані особливості конструкції чутливого елементу напівпровідникового газового сенсора на основі тришарової плівки Pt/TiO2/Pt. Дана багатошарова плівкова система була отримана методом реактивного магнетронного розпилення
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3

Nxumalo, Silethelwe. "The Pt₈V ordering transformation in Pt 11 at. % V." Doctoral thesis, University of Cape Town, 2006. http://hdl.handle.net/11427/4958.

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Includes bibliographical references (leaves 121-125).<br>The Pt₈V ordering transformation in Pt 11 qt.% V alloys has been studied. The study included determining the thermodynamic stability of Pt₈V, the kinetics of Pt₈V ordering transformation and the strengthening due to the presence of the ordered phase. Transmission electron microscopy, using election diffraction and dark and bright field imaging, and X-ray diffraction were used for structural characterisation. Electrical resistivty was used to investigate the kinetics of Pt₈V ordered phase. Microhardness measurements were used to investiga
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4

Rufino, Élen Cristina Gonçalves. "Estudo da estabilidade de eletrocatalisadores Pt/C e Pt-RuOx/C." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/59/59138/tde-08082011-134145/.

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Neste trabalho, foram investigadas as modificações na estrutura e a estabilidade de eletrocatalisadores Pt/C e Pt-RuOx/C, preparados pela decomposição térmica de precursores poliméricos. Experimentos de varredura de potencial e experimentos com potencial fixo foram realizados com o objetivo de acelerar os mecanismos de degradação dos catalisadores. Para identificar e compreender os fatores que levaram a degradação dos catalisadores, foram realizados experimentos para determinação da área superficial eletroquimicamente ativa dos catalisadores, através da adsorção/oxidação de CO, análises dos ca
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5

Saouabe, Mohammed. "Influence du mode de préparation sur les propriétés de catalyseurs bimétalliques supportés : Pt-Ir, Pt-Re, Pt-Sn." Poitiers, 1992. http://www.theses.fr/1992POIT2320.

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Au cours de cette etude, nous avons compare les proprietes de catalyseurs bimetalliques de type reformage, prepares par des methodes classiques telles que la coimpregnation ou les impregnations successives, et une technique plus originale faisant appel a la formation d'un complexe ionique bimetallique a l'interieur de la porosite de l'alumine. L'ensemble des resultats obtenus sur les couples platine-iridium, platine-rhenium et platine-etain montrent que cette derniere methode de preparation conduit a une meilleure interaction entre les deux metaux sur une alumine de reformage. Cependant cette
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6

Fonfé, Benjamin. "Hydrogenation of tetralin over oxide supported Pt and Pt-Pd catalysts." kostenfrei, 2008. http://mediatum2.ub.tum.de/doc/669041/669041.pdf.

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7

Benlaharche, Tewfik. "Étude et modélisation thermodynamique du système Mo-Pt-Si." Thesis, Nancy 1, 2008. http://www.theses.fr/2008NAN10036/document.

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L’étude menée sur le système Mo-Pt-Si vise à contribuer à la connaissance d’alliages métalliques complexes destinés à des applications à hautes températures rencontrées dans les industries aéronautiques ou verrières. Sa description d’un point de vue thermodynamique est rendu difficile par son caractère réfractaire lié à la présence du molybdène d’une part et à sa complexité due au nombre élevé de ses constituants (3 éléments) d’autre part. Seule une approche du problème par une modélisation thermodynamique de type CALPHAD permet d’aboutir à un résultat significatif. Comme l’impose l’établissem
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8

Nascimento, José Henrique do. "Sistemas fotônicos PT-simétricos." Universidade Federal de Alagoas, 2018. http://www.repositorio.ufal.br/handle/riufal/3512.

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The spatial evolution of a pair of resonant Bragg modes through a medium characterized by a complex one-dimensional PT -symmetric periodic relative electric permittivity is thoroughly investigated. By using the two wave model, analytic solutions of Maxwell’s equations are derived in the nonparaxial regime in order to investigate the periodic energy exchange between the Bragg modes for the Hermitian optical lattices as well as for complex lattices and also to investigate the spatial evolution of the real part of the electric field that propagates through this medium. Three regimes defined by th
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9

Darlington, Michael James David. "The stability of single crystal Pt and Pt₃Ni surfaces during electro-oxidation." Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/2005579/.

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In an e�ort to gain a fundamental understanding of the link between catalyst surface structure, reactivity and stability, experiments have been performed on Pt(111), Pt3Ni(111) and Pt(100) single crystal electrode surfaces via a combina- tion of in-situ structural probes and electrochemical (cyclic voltammetry) mea- surements. Pt(111), which is the least active of the low index surface for the Oxygen Reduction Reaction (ORR), showed morphological changes after oxida- tion reduction cycles, with the formation of stable platinum adislands. The more active Pt(100) surface undergoes a drastic roug
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10

Silva, Pedro Gustavo de Sousa. "Dilemas de um Partido de Governo: Conflitos entre PT e Governo Lula (2003-2006)." Universidade Federal do CearÃ, 2011. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6081.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior<br>A vitÃria de Lula nas eleiÃÃes 2002 inaugurou um quadro completamente novo no cenÃrio polÃtico nacional. O PT e os tradicionais aliados (PC do B, PSB, CUT, UNE, MST, etc.) assumem pela primeira vez a tarefa de âser governoâ no Ãmbito federal. Embora o Partido fosse a principal forÃa polÃtica da gestÃo no Poder Executivo e no Congresso Nacional, a sigla despontou como um dos agentes que mais divergiram do governo Lula. De um lado, setores do PT cumprem o papel de protagonistas nas tensÃes com o governo. De outro lado, uma parte majo
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11

Antunes, Ettore Paredes. "Estudo da atividade eletrocatalítica de multicamadas metálicas de Ir/Pt e Cu/Pt eletrodepositadas sobre Pt(policristalina) para eletrooxidação de moléculas orgânicas pequenas." Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/6575.

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Made available in DSpace on 2016-06-02T20:36:49Z (GMT). No. of bitstreams: 1 5680.pdf: 7847035 bytes, checksum: 99b6945abbfe45fb028cce964b60c302 (MD5) Previous issue date: 2013-09-26<br>Financiadora de Estudos e Projetos<br>The search for alternative energy sources stead fossil fuel has driven the development of new energy generating devices. Among these, the Direct Alcohol Fuel Cells are a kind of device that directly convert chemical energy into electricity from short chain alcohols. However, it is necessary to develop electrodes with high catalytic activity. Several materials composed by
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12

Zulke, Alana Aragon. "Desenvolvimento de multicamadas metálicas do tipo Pt/Ir/Pt eletrodepositadas em titânio para eletrocatálise." Universidade Federal de São Carlos, 2012. https://repositorio.ufscar.br/handle/ufscar/6527.

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Made available in DSpace on 2016-06-02T20:36:38Z (GMT). No. of bitstreams: 1 4377.pdf: 4163228 bytes, checksum: c226cdaadadec6b48a2334a2446ba4e3 (MD5) Previous issue date: 2012-04-19<br>Universidade Federal de Sao Carlos<br>Regarding to the search for new energy sources, of renewable character, fuel cells fall into one of the most studied proposals on Electrochemistry. More specifically, the direct fuel cells (DAFCs) using short-chain alcohols as fuel, have attracted the attention of researchers over the past two decades. Problems related to the energy efficiency of Pt-based catalysts for us
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13

Великодний, Дмитро Володимирович, Дмитрий Владимирович Великодный, Dmytro Volodymyrovych Velykodnyi та ін. "Тензоефект у магнітооптичних властивостях плівкових систем Fe/Pt/П та [Fe/Pt][8]/П". Thesis, Сумський державний університет, 2013. http://essuir.sumdu.edu.ua/handle/123456789/43923.

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14

Murrugarra, Tomairo David Manuel. "Anillo de cobordismo MU*(pt)." Bachelor's thesis, Universidad Nacional Mayor de San Marcos, 2005. https://hdl.handle.net/20.500.12672/1254.

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El objetivo principal de la presente tesis es estudiar la estructura del anillo de Cobordismo Complejo MU*(pt). Milnor y Novikov fueron los primeros en mostrar que este es un anillo polinomial sobre generadores de grado par sobre Z. Este cálculo se realiza utilizando la sucesión espectral de Adams sobre una teoría de homología generalizada. La exposición de este teorema ocupa la parte final de este trabajo. En la primera parte se presenta el teorema de Adams sobre la convergencia de su sucesión espectral. En la segunda parte, se describe el espectro de Thom y la teoría de homología generalizad
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15

Curnick, Oliver J. "Ionomer-stabilised Pt and Pt-Ti bimetallic electrocatalysts for the proton exchange membrane fuel cell." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3732/.

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This work aims to address the need for more durable electrocatalysts with lower precious metal content for proton exchange membrane fuel cells (PEMFCs), through the development of novel electrocatalyst materials and preparation routes. In this work, 'Nafion-Pt/C' electrocatalysts have been derived from ionomer-stabilised Pt nanoparticles synthesised via a novel, wet-chemical route that offers unprecedented control over the formation of the Pt-ionomer interface, with a view towards maximising the utilisation of the electrocatalyst. Nafion-Pt/C electrocatalysts have been characterised using ex-s
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16

Scholes, Fiona Helen. "Far-infrared emission spectroscopy of C₆D₆ and CO on pt(111) and pt(110)." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621412.

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17

Matsutsu, Molefi. "Pt and Pt-Pd cluster interaction with graphene and TiO₂ based supports: A DFT study." Doctoral thesis, University of Cape Town, 2016. http://hdl.handle.net/11427/22922.

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Density functional theory (DFT) calculations have been performed to gain insight into the role of defects present on the surface of graphene and TiO₂ based supports on supported metal clusters. The clusters considered are a Pt₃₈ cluster and a bimetallic Pt₃₂Pd₆ alloy. The defects considered on graphene based supports are monovacancy defective graphene, OH and COOH functionalised graphene. The defects considered on TiO₂ based supports are a partially reduced TiO₂(110) surface with a surface oxygen bridge vacancy and hydroxylated TiO₂(110) surface with surface OH groups. The defect free graphene
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18

Atli, Halil Atilla. "Réactivité de surfaces d'alliages monocristallins Pt-Ni et Pt-Fe vis-à-vis de l'hydrogène." Lyon 1, 1992. http://www.theses.fr/1992LYO10104.

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La reactivite de surface d'alliages monocristallins -pt#5#0ni#5#0(111), pt#5#0ni#5#0(110) et pt#8#0fe#2#0(111)- vis-a-vis de l'hydrogene a ete etudiee sous basses pressions essentiellement par thermodesorption (tds) et mesure de variation de travail de sortie des electrons. Les travaux anterieurs ont montre que la premiere couche de surface se caracterise par une forte segregation de pt sur les faces denses (111), de ni sur la face ouverte (110). La composition et la structure de ces surfaces ont ete controlees par spectroscopie auger (aes) et diffraction d'electrons lents (leed). L'adsorption
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19

Roca, Lizarazu Maria. "Finding the Holocaust in metaphor : renegotiations of trauma in contemporary German- and Austrian-Jewish literature." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/95167/.

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This thesis investigates representations of the Holocaust and the Second World War across a range of German- and Austrian-Jewish writers who belong to the second or third generation born after the Holocaust. These writers relate to the events from the position of the “nonwitness” (Weissman 2004), and in the face of major shifts in Holocaust memory since the millennium: the disappearance of the survivor and eyewitness generation entails a transition from first-hand memories of the war period to an increasingly ritualised cultural memory of the events. This transformation intersects with larger
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20

Haberlah, Gesine. "Zwischen Autobiographie und Fiktion : neue literarische Schreibweisen bei Felicitas Hoppe, Charlotte Roche, Stephan Wackwitz und David Wagner." Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33440/.

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This thesis examines forms of autobiographical writing in the 21st century which are located at the intersection of autobiography and fiction. The literary sources selected question established genre boundaries, while also reflecting contemporary cultural discourses and creating particular images of their authors. My analysis investigates the new literary strategies emerging in Charlotte Roche’s Schoßgebete (2011), Stephan Wackwitz’s Ein unsichtbares Land (2003), Felicitas Hoppe’s Hoppe (2012) and David Wagner’s Leben (2012) in order to identify how texts such as these combine autobiography an
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21

Becker, Renate. "Die literarische Darstellung weiblicher Subjektivität in der westdeutschen Frauenliteratur der siebziger und achtziger Jahre." Thesis, University of Warwick, 1988. http://wrap.warwick.ac.uk/110021/.

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Although the emphasis of this thesis is on the literary representation of female subjectivity in contemporary women's writing in West Germany, the first chapter looks back on the history of women's emancipation in Germany from the early 19th century until today. Selected examples of women's writing will show how women - in their writing and often their lives - attempted to break out of the restrictions which existing male images of women and society as a whole had set up for them. Included in this chapter are the beginnings of women's movements and the struggle for political and social rights.
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22

Graves, S., S. Goel, F. Chen, et al. "Production and novel radiochemical separation of 194Au from Pt for use in multi-modality nanoparticles." Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-166428.

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Introduction Gold nanoparticles (AuNPs) have demonstrated their incredible versatility in applications such as in vitro and in vivo imaging, cancer therapy, and drug delivery.[1-3] These AuNPs come in many shapes including nanospheres, nanorods, nanoshells, and nanocages. Their versatility stems from the ability to construct or label a single AuNP with many functions. Many types of AuNPs are inherently flourescent, allowing for ex vivo utilization as well as small animal fluorescence imaging.[4] High atomic number and physical density allow for the possibility of using AuNPs as computed tomogr
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23

Zignani, Sabrina Campagna. "Estudo da estabilidade de catalisadores catódicos em célula eletroquímica." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-25082009-100339/.

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O objetivo do presente trabalho foi avaliar a estabilidade de eletrocatalisadores de Pt/C e ligas binárias de Pt-Co/C e Pt-Ni/C contendo 20% em massa de metal sobre carbono frente à reação de redução de oxigênio em células eletroquímicas. O trabalho experimental desenvolvido compreende várias etapas como preparação de catalisadores, tratamento térmico e preparação de eletrodos. O catalisador foi preparado pela redução de precursores com borohidreto de sódio, e suportado em carbono de alta área superficial (Vulcan XC-72, Cabot, 240m2g-1). O eletrodo da célula é um eletrodo de difusão de gás (ED
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24

More-Chevalier, Joris. "Etude de l’effet magnétoélectrique dans les hétérostructures de Pt/TbXDy1-XFe2/Pt/PbZrXTi1-XO3/Pt en couches minces déposées sur des substrats de siliciumsubstrats de silicium." Caen, 2015. http://www.theses.fr/2015CAEN2029.

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Ce travail de thèse porte sur l’étude de l’effet magnétoélectrique (ME) dans les matériaux composites TbxDy1-xFe2 (Terfenol-D)/Pt/Pb(ZrxTi1-x)O3 (PZT) en couches minces déposées sur substrats Pt/SiO2/Si. L’objectif est d’obtenir de bons coefficients de couplage magnétoélectrique permettant l’exploitation de ces composites dans des dispositifs microélectroniques. La première partie de ce travail porte sur l’étude des relations entre les propriétés structurales et les propriétés magnétiques des films de Terfenol-D. Il a notamment été montré qu’il est possible d’obtenir, dans différentes conditio
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25

Hilgers, Karsten. "Kernchemische Studien zur Entwicklung neuerer Produktionsverfahren für die therapierelevanten Radionuklide ¹⁴°Nd, ¹⁹¹Ir, ¹⁹¹Pt, ¹⁹³mPt und ¹⁹⁵Pt." Jülich : Forschungszentrum Jülich in der Helmholz-Gemeinschaft, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=97844213X.

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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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27

Breitwieser, Matthias, Matthias Klingele, Benjamin Britton, Steven Holdcroft, Roland Zengerle, and Simon Thiele. "Improved Pt-utilization efficiency of low Pt-loading PEM fuel cell electrodes using direct membrane deposition." Elsevier, 2015. https://publish.fid-move.qucosa.de/id/qucosa%3A72517.

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Direct membrane deposition was used to produce record platinum catalyst utilization efficiency polymer electrolyte membrane fuel cells. The novel membrane fabrication technique was applied to gas diffusion electrodes with low Pt-loadings of 0.102 and 0.029 mg/cm2. Under oxygen atmosphere and 300 kPaabs total pressure, 88 kW/gPt cathodic catalyst utilization efficiency with a symmetrical Pt-loading of 0.029 mg/cm2 on the anode and cathode side was achieved. This is 2.3 times higher than the Pt-utilization efficiency of a reference fuel cell prepared using a commercial Nafion N-211 membrane and
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28

Karima, Alilat. "Matériaux piézoélectriques pour applications transducteurs acoustiques de puissance : PIN-PT nanocéramiques et PMN-PT céramique texturées." Châtenay-Malabry, Ecole centrale de Paris, 2008. http://www.theses.fr/2008ECAP1097.

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Le cœur des transducteurs électro-acoustiques en détection sous-marine est une céramique piézoélectrique de structure Pérovskite ABO3. Dans le cas des dispositifs d’émission, le matériau piézoélectrique est soumis d’une part à un fort champ électrique alternatif et à des déformations élastiques élevées entraînant un échauffement qui peut induire une diminution irréversible de ces propriétés. L’objectif de cette thèse est de développer des matériaux piézoélectriques stables en température et sous fort champ électrique alternatif. Nous avons, dans un premier temps, étudié les propriétés non-liné
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Junior, Flávio Colmati. "Estudo de catalisadores de Pt-Sn para o ânodo da célula a combustível de membrana trocadora de prótons alimentada com etanol direto." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-27032008-084800/.

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Eletrocatalisadores de Pt-Sn suportados em carbono de elevada área superficial foram preparados por redução química de precursores metálicosm em solução usando como agente redutor o ácido fórmico. Esse método mostrou-se muito eficiente sendo possível obter tanto catalisadores com baixos teores de Sn (razão atômica Pt:Sn de 9:1) como com altos teores de Sn (razão atômica Pt:Sn de 1:3). Entretanto, apesar de ser o Sn reduzido e ancorado sobre o substrato de carbono apenas parte deste Sn é inserido na rede cristalina da Pt sendo necessário um tratamento térmico em atmosfera redutora para aumentar
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30

Millican-Slater, Adam. "Aspects of PT-symmetric quantum mechanics." Thesis, Durham University, 2004. http://etheses.dur.ac.uk/3125/.

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PT-symmetric quantum mechanics is an alternative to the usual hermitian quantum mechanics. We will start this thesis by taking an overview of the subject, seeing some of the elementary consequences of this different approach. The main part of the work will be an depth study of a specific Hamiltonian(diagram) This is a generalisation of the well understood harmonic oscillator with angular momentum. By making this generalisation we break the hermiticity of the problem. This leads to some intriguing results. We will be particularly interested in the merging of eigenvalues for M <1.We study the pr
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31

Tanjung, Michael. "PT. Telekomunikasi Indonesia: challenging year ahead." Master's thesis, NSBE - UNL, 2014. http://hdl.handle.net/10362/11714.

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32

Peräntie, J. (Jani). "Electric-field-induced dielectric and caloric effects in relaxor ferroelectrics." Doctoral thesis, Oulun yliopisto, 2014. http://urn.fi/urn:isbn:9789526204406.

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Abstract In this thesis, dielectric and thermal behaviours due to the application of an electric field were studied in relaxor ferroelectric (1−x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) and (1−x)Pb(Zn1/3Nb2/3)O3-xPbTiO3 (PZN-PT) systems of great technological importance. Special attention was given to the behaviour of the electric-field-induced phase transitions and electrocaloric effect, which are closely related to the existing and potential applications. Reactive sintering or columbite methods were used to fabricate polycrystalline PMN-PT ceramics with various compositions (x=0−0.3). In addition,
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33

Schimpf, Sabine. "Partielle Gasphasen-Hydrierung von 2-Butenal zu 2-Butenol an Pt/TiO2- und Pt-Sn/TiO2-Katalysatoren." Doctoral thesis, [S.l. : s.n.], 1999. http://deposit.ddb.de/cgi-bin/dokserv?idn=967371872.

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34

Klewe, Christoph [Verfasser]. "Static and non-equilibrium magnetic proximity effects in Pt/NiFe2O4 and Pt/Ni1 – xFex heterostructures / Christoph Klewe." Bielefeld : Universitätsbibliothek Bielefeld, 2016. http://d-nb.info/1084887142/34.

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35

Heße, Simon [Verfasser], and Hans Peter [Akademischer Betreuer] Oepen. "Magnetotransport in Co/Pt-Schichtsystemen und Charakterisierung einzelner Co/Pt-Nanoteilchen / Simon Heße. Betreuer: Hans Peter Oepen." Hamburg : Staats- und Universitätsbibliothek Hamburg, 2014. http://d-nb.info/1054421684/34.

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36

Gorchon, Jon. "Current and field induced magnetization reversal in Pt/Co/Pt and (Ga, Mn)(As, P) ferromagnetic films." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112143.

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La manipulation de l’état magnétique d’un système ferromagnétique présente un grand intérêt en raison de possibles applications technologiques. Comprendre les mécanismes fondamentaux qui contrôlent l’aimantation est donc particulièrement important. La compréhension de certains mécanismes peut également avoir un impact dans d’autres domaines de la physique. C’est le cas par exemple de la dynamique de déplacement de parois de domaines sous champ magnétique dans le régime de reptation (creep) qui peut être assimilé à celui d’une interface élastique et qui présente un caractère universel. Cette th
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37

Souza, Nyccolas Emanuel de. "Catalisadores 'PT' e 'PT"SN' modificados com 'SN''O IND.2' para a oxidação eletroquímica de etanol /." Araraquara [s.n.], 2011. http://hdl.handle.net/11449/92048.

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Orientador: Hebe de Las Mercedes Villullas<br>Banca: Antônio Carlos Dias Ângelo<br>Banca: Lucia Helena Mascaro<br>Resumo: Com o intuito de avaliar a influência da presença de óxido na resposta eletrocatalítica para a oxidação de etanol, foram preparados quatro materiais constituídos de partículas metálicas de Pt ou liga PtSn, suportados sobre SnO2 e carbono, ou diretamente sobre carbono (Pt-SnO2/C, Pt/C, PtSn/C e PtSn-SnO2/C). As nanopartículas metálicas e as nanopartículas de SnO2 foram preparadas inicialmente em estado coloidal, em processos de síntese realizados separadamente para garantir
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38

Mateus, João Henrique do Carmo. "PT Multimedia: spinning off PT Multimedia." Master's thesis, 2016. http://hdl.handle.net/10362/17267.

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The purpose of the present case – and accompanying Teaching Notes – is to better understand the spin-off of PT Multimédia, by Portugal Telecom, after receiving a Public Takeover Offer from Sonaecom, in 2006. The Government and the Competition Authority had never looked in a serious way at PT’s dominant position and the lack of room for competition in the TMT sector – PT was the owner of both the cable and copper networks, having access to privileged information from its competitors with control over the wholesale and retail businesses. In 2006, the company received a takeover offer from Sonaec
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39

Nowak, Lukáš. "Kontrola magnetické anizotropie v multivrstvách Pt/Co/Pt." Master's thesis, 2021. http://www.nusl.cz/ntk/nusl-448241.

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This thesis aims to explore the effect of in situ ion gun etching on magnetic proper- ties, such as perpendicular magnetic anisotropy, of Pt/Co/Pt multilayers. Perpendicular magnetic anisotropy is of interest due to its importance in spintronic application. Calibration spectroscopic ellipsometry measurements of Pt and Co layers to obtain sputter yields of respective magnetron targets were performed as a first step. After that, ten Pt/Co/Pt multilayers with different Co and top Pt layer thicknesses were prepared. Five of these samples were etched by the ion gun, mounted inside of the magnetron
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40

Yang, Jin-Cherng, and 楊金成. "Electrochemical Sensor Based on Pt/Nafion and Pt/Nafion/Pt Membrane Electrrodes for NO Sensing." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/02235195409838274068.

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碩士<br>國立臺灣大學<br>化學工程學系<br>85<br>The oxidation of nitric oxide(NO) at platinum membrane electrodes is discussed. The Pt/Nafion and Pt/Nafion/Pt membrane electrodes were prepared by the impregnation-reduction procedure. The electrochemical behaviors during the oxidation of nitric oxide at the platinum/solid polymer electrolyte interface, including the limiting current density, sensitivity, response time, aging, and redox characteristics, were studied. The NO oxidation limiting current is obs
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41

Li, Yang-Shyun, and 李仰薰. "The Perpendicular Anisotropy and Antiparallel Coupling in [Co/Pt], [Co0.3Fe0.7/Pt], and [Fe/Pt] Multilayers." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/96947657629245299344.

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碩士<br>國立中正大學<br>物理所<br>98<br>Ferromagnetic materials with perpendicular anisotropy, such as CoPt and FePt, which may have high thermal stability and the characteristic of reduction of the switching current in spin-transfer-torque devices, has become the most prosing candidate for the further application on random access memory. In this thesis, we fabricated [Co/Pt],[Co0.3Fe0.7/Pt],and [Fe/Pt] multilayered structure by DC and RF sputtering techniques and carried out detailed magnetic characterizations. The major results include:
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42

Wang, Yu-Fang, and 王毓芳. "Carbon Supported Pt and Pt-Ru Catalyst: Preparation and Catalysis." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/73764385535697823038.

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碩士<br>國立中正大學<br>化學工程研究所<br>85<br>Abstract The goals of this research were to prepare cabon supported Pt and Pt- Ru catalysts for methanol fuel cell and for oxidation of acetaldehyde. The oxidation reaction of acetaldehyde were carried out with a continous fix bed reactor at 40℃and 520psig. Both fresh and the reacted catalysts were characterized by CO chemisorption , fast Fourier transform infrared (FFT-IR) spectroscopy, temperature programmed reduction (TPR), atomic
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43

Kim, Seok koo 1973. "Platinum catalysts degradation by oxide-mediated platinum dissolution in PEMFCs (Proton Exchange Membrane Fuel Cells)." Thesis, 2011. http://hdl.handle.net/2152/28723.

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Proton exchange membrane fuel cells (PEMFCs) have attracted great attention due to their high power density, low-temperature operation and high energy conversion efficiency. However, the high cost of Pt catalysts and durability problems hinder their commercialization. So their cost must be lowered drastically and their durability must be extended. In an effort to overcome these problems, there have been intensive efforts to enhance the activity, durability and to lower the price of catalysts by alloying with other less expensive metals. In particular, the sluggish kinetics of ORR caused by Pt
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44

Buntrock, Valerie. "Understanding Pt•••Pt and Pt•••Au metallophilic interactions in single salt and double salt complexes using photophysical tools." Thesis, 2013. https://hdl.handle.net/2144/15251.

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Seven [Pt(tpy)X]Y (X=Cl, Y=Cl•2H2O, X=Cl, Y=Cl•DMSO, X=Cl, Y=PF6, X=Cl, Y=SbF6, X=Cl, Y=SbF6•CH3CN, X=Br, Y= Br•2H2O, and X=Br, Y=PF6) complexes were prepared and characterized. Structural analysis shows consistent patterns in Pt^...Pt interactions that vary slightly depending on the coordinating halogen, X, counteranion, Y, and lattice solvent. Diffuse reflectance was used to identify solid-state ^1MMLCT absorption bands, and the relationship between Pt-Pt distance and ^1MMLCT absorption energy will be discussed. Metallophilic Pt^...Au interactions in [Pt(tpy)X][AuX'2] (X=X'=CN, X=Cl, X'=C
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45

Vineeth, Mohanan P. "Spin Hall Effect Mediated Current Induced Magnetization Reversal in Perpendicularly Magnetized Pt/Co/Pt Based Systems." Thesis, 2016. http://etd.iisc.ac.in/handle/2005/3078.

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In the present thesis, magnetization reversal in both out-of-plane and in-plane magnetized thin lms and in devices fabricated out of those lms are explored. Pt/Co/Pt stacks with ultrathin Co layer were in-estimated initially for understanding their magnetic properties in this thesis. These perpendicular magnetized systems are good candidates for magnetic hard disc drives due to their large anisotropy, which may allow miniaturization of magnetic data storage devices. The spin Hall e ect mediated current-induced magnetization reversal in patterned Pt/Co/Pt devices were extensively investigated.
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46

Vineeth, Mohanan P. "Spin Hall Effect Mediated Current Induced Magnetization Reversal in Perpendicularly Magnetized Pt/Co/Pt Based Systems." Thesis, 2016. http://hdl.handle.net/2005/3078.

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Abstract (sommario):
In the present thesis, magnetization reversal in both out-of-plane and in-plane magnetized thin lms and in devices fabricated out of those lms are explored. Pt/Co/Pt stacks with ultrathin Co layer were in-estimated initially for understanding their magnetic properties in this thesis. These perpendicular magnetized systems are good candidates for magnetic hard disc drives due to their large anisotropy, which may allow miniaturization of magnetic data storage devices. The spin Hall e ect mediated current-induced magnetization reversal in patterned Pt/Co/Pt devices were extensively investigated.
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47

Jeong, Doo Seok [Verfasser]. "Resistive switching in Pt/TiO2/Pt / submitted by Doo Seok Jeong." 2008. http://d-nb.info/990714357/34.

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48

Lin, Jia-Horng, and 林嘉宏. "Hydroisomerization of n-heptane on Pt/BEA and Pt/MOR Catalysts." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/64477700152214965929.

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49

Glaner, Lizelle. "A study of the Ni-Pt-Ru and Co-Pt-Ru systems." Thesis, 2011. http://hdl.handle.net/10539/10537.

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The solidification projections and 1000°C isothermal sections of the Ni-Pt-Ru and Co-Pt-Ru systems were determined by characterising alloys of different using SEM and XRD on arc-melted as-cast and annealed samples. Hardness measurements were undertaken and the hardness indentations were also used to determine the preliminary toughness of the samples. The solidification projection of the Ni-Pt-Ru system showed that the (Ni,Pt) solvus retreats to the Pt corner in the ternary wherever (Ru) formed where it was not expected and a third phase appeared after heat treatment on a locus from ~Ni20: Pt3
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50

Jan, Kao Yu, and 高玉娟. "Study of Pt or Ir atoms and custers diffusion on Pt surfaces." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/98703201464765918748.

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碩士<br>國立臺灣師範大學<br>物理學系<br>96<br>study of Pt or Ir atoms and clusters diffusion on Pt surfaces Using the field ion microscope in ultra high vacuum, we observe directly the diffusion behavior of Pt or Ir atoms on Pt surfaces. After annealing at 135K, single Pt occupies at FCC site exclusively on Pt(111). This phenomenon is decided by the apex of the image triangle. By site mapping, we analyze how many steps Pt diffuses, and then put the mean square displacements into the Boltzmann distribution. The diffusion activation energy of Pt on Pt(111) is 0.33±0.01 eV. According to the frequency
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