Bibliografías temáticas / Pt

Literatura académica sobre el tema "Pt"

Autor: Grafiati
Publicado: 4 de junio de 2021
Última modificación: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Pt"

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Irikura, Karl K. "Polarizability of atomic Pt, Pt+, and Pt−". Journal of Chemical Physics 154, n.º 17 (7 de mayo de 2021): 174302. http://dx.doi.org/10.1063/5.0044996.

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Hwang, Gui-Sung y Rhim-Youl Lee. "Characteristics of Pt, Pt-Ru and Pt-CeO2Catalysts Supported on Carbon Nanotubes for Methanol Fuel Cell". Korean Journal of Materials Research 21, n.º 3 (27 de marzo de 2011): 138–43. http://dx.doi.org/10.3740/mrsk.2011.21.3.138.

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Chen, Sinn-wen y Shyh-jye Luo. "Interfacial Reactions in Pt/Ti, Pt/Zr, Pt/TiO2, and Pt/ZrO2Couples". Industrial & Engineering Chemistry Research 39, n.º 2 (febrero de 2000): 547–49. http://dx.doi.org/10.1021/ie990463h.

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Baddour, Frederick G., Stephanie R. Fiedler, Matthew P. Shores, Jeffrey W. Bacon, James A. Golen, Arnold L. Rheingold y Linda H. Doerrer. "Pt···Pt vs Pt···S Contacts Between Pt-Containing Heterobimetallic Lantern Complexes". Inorganic Chemistry 52, n.º 23 (19 de noviembre de 2013): 13562–75. http://dx.doi.org/10.1021/ic402075y.

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Sun, Shi-Gang y Yan Lin. "Kinetics of isopropanol oxidation on Pt(111), Pt(110), Pt(100), Pt(610) and Pt(211) single crystal electrodes -". Electrochimica Acta 44, n.º 6-7 (noviembre de 1998): 1153–62. http://dx.doi.org/10.1016/s0013-4686(98)00218-7.

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Ongrai, O., J. V. Pearce, G. Machin y S. J. Sweeney. "Comparative Study of Pt/Pd and Pt–Rh/Pt Thermocouples". International Journal of Thermophysics 31, n.º 8-9 (13 de julio de 2010): 1506–16. http://dx.doi.org/10.1007/s10765-010-0782-0.

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Forniés, Juan, Ana García, Julio Gómez, Elena Lalinde y M. Teresa Moreno. "Synthesis of Pt(II)−Pt(II) and Pt/Pd(II)−Pt(0) Monoalkynylphosphine Bridging Complexes". Organometallics 21, n.º 18 (septiembre de 2002): 3733–43. http://dx.doi.org/10.1021/om020374w.

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Ho, Patrick W. C., Firas Odai Hatem, Haider Abbas F. Almurib y T. Nandha Kumar. "Comparison between Pt/TiO2/Pt and Pt/TaOX/TaOY/Pt based bipolar resistive switching devices". Journal of Semiconductors 37, n.º 6 (junio de 2016): 064001. http://dx.doi.org/10.1088/1674-4926/37/6/064001.

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Feibelman, Peter J. y Thomas Michely. "Pt-dimer dissociation on Pt(111)". Surface Science 492, n.º 1-2 (octubre de 2001): L723—L728. http://dx.doi.org/10.1016/s0039-6028(01)01459-5.

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Sergeyev, D. y N. Zhanturina. "Simulation of Electrical Characteristics of Switching Nanostructures "Pt – TiO – Pt" and "Pt – NiO – Pt" with Memory". Radioengineering 28, n.º 4 (13 de diciembre de 2019): 714–20. http://dx.doi.org/10.13164/re.2019.0714.

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Tesis sobre el tema "Pt"

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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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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 indicaram que o grau de recobrimento dos metais sobre o suporte é menor que uma monocamada, cerca de 10% desta. Tais resultados comparados com a literatura indicam a formação de aglomerados, ilhas, em estruturas bi e tridimensionais no caso do cobre. Em estanho foi atingido maior grau de recobrimento. No entanto, comparando os resultados para estanho com o da literatura, este não se depositou na forma de adátomos, mas como hidróxido ou sulfato. Esta forma de interação do estanho com a platina é a responsável pela diminuição do potencial de oxidação do metanol sobre o substrato. Na eletro-oxidação do metanol os melhores resultados foram obtidos na presença de estanho, no entanto ressalta-se que neste caso a influência da rotação não foi significante e as medidas de cronoamperometria indicaram melhor atividade nesta situação com o eletrodo modificado.
Methanol oxidation reaction was studied with copper and tin modified single-crystal electrodes. This study was carried out using UPD and OPD techniques using the EDRMP configurations the results showed that the coverage degree of copper and tin on platinum single-crystal as less than one monolayer (_ 10% monolayer) and possible with the formation of islands in bi and tridimenision. The deposition of copper was not good to the methanol oxidation reaction, possible due to a higher solvatation by anions at the Cu sites, conducting to a blocking effect on the Pt neighboring atoms. The tin deposition have shown a higher activity for methanol oxidation reaction. This ascribed to the hydroxides formation at tin sites, which increase the kinetics of CO oxidation following the bifunctional mechanism.
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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 на постійному струмі. Також при виготовленні сенсору виготовлявся метод фотолітографії. При вимірюванні електрофізичних властивостей сенсору (реакція зміни електроопору на концентрацію газу) використовувався автоматизований комплекс, що складається з газової камери, системи керування та реєстрації сигналу. Потік та концентрація газу були керовані двома контролерами, які керуються через програмне забезпечення.
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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).
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 investigate the Pt₈V ordered phase and its effects on hardness.
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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 catalisadores por difração de raios X (DRX) e análises das soluções por espectrometria de massa com fonte de plasma indutivamente acoplado (ICP-MS).Foram avaliadas as modificações na estrutura e a estabilidade dos eletrocatalisadores Pt/C e Pt-RuOx/C quando submetidos a 2000 varreduras de potencial em diferentes intervalos (i) 0,05-0,5 V; (ii) 0,05-0,7 V e (iii) 0,05-0,9 V na presença e na ausência de metanol e também quando submetidos a um potencial fixo por várias horas. Foi observado, de maneira geral, um aumento no tamanho dos cristalitos, dissolução dos componentes metálicos e uma redução da área superficial eletroquimicamente ativa. Os resultados obtidos na primeira parte do trabalho também mostraram que a degradação dos catalisadores foi maior na presença de metanol e que condições de potencial cíclico aceleram os mecanismos de degradação quando comparadas a condições de potencial fixo. Após uma melhor compreensão dos mecanismos de degradação, a segunda parte do trabalho foi voltada para investigação da influência de modificações no método Pechini durante a síntese dos eletrocatalisadores Pt-RuOx/C na estrutura e estabilidade destes catalisadores. Para isto, os catalisadores foram submetidos a varreduras de potencial entre 0,05-0,6 V e experimentos com potencial fixo em 0,6 V na presença de metanol. Para avaliar a influência das modificações no método de preparo na eletroatividade dos catalisadores, foram realizados testes em uma DMFC utilizando uma MEA (Membrane Electrode Assemblies) formada por ânodo Pt-RuOx/C / membrana de Nafion® 117 / cátodo Pt/C comercial (E-TEK). O estudo da estabilidade mostrou que o catalisador cuja mistura composta pelas resinas e suporte de carbono foi submetida à rotação em um moinho de bolas antes do tratamento térmico se mostrou bem mais estável que os demais catalisadores (submetidos ao ultrassom). Já os catalisadores preparados com uma única resina contendo Pt e Ru e submetidos ao ultrassom antes do tratamento térmico, mostraram os melhores resultados nos experimentos em condições operacionais em célula a combustível unitária. A terceira e última parte deste trabalho teve por objetivo investigar os efeitos da utilização do carbono Black Pearls 2000 como suporte na estabilidade e eletroatividade de eletrocatalisadores Pt-RuOx/C. Testes em uma DMFC e varreduras de potencial na presença de metanol foram realizados e os resultados comparados com os obtidos para os catalisadores sintetizados com carbono Vulcan XC-72. Os catalisadores sintetizados com carbono Black Pearls 2000 apresentaram maior área superficial eletroquimicamente ativa que os catalisadores preparados com carbono Vulcan XC-72 pelo mesmo procedimento, indicando uma melhor dispersão das partículas metálicas sobre o suporte, uma vez que a quantidade de Pt nos catalisadores foi mantida constante. Esta melhor dispersão das nanopartículas metálicas sobre o suporte resultou em maiores valores de densidade de potência e densidade de corrente em célula a combustível unitária operando com metanol na fase líquida. Para dois dos três catalisadores, o desempenho foi superior ao catalisador comercial da E-TEK. A dissolução dos componentes metálicos e a redução da área superficial eletroquimicamente ativa foi menor para os catalisadores preparados com carbono Black Pearls 2000 e o tamanho de cristalito não variou após 2000 varreduras de potencial. Todos estes resultados mostram uma maior estabilidade dos catalisadores preparados com este suporte.
In this work, changes in the structure and stability of the Pt/C and Pt-RuOx/C catalysts, prepared by the thermal decomposition of polymeric precursors, were investigated. Potential scans and constant potential experiments were carried out, to accelerate catalyst degradation mechanisms. To comprehend the catalyst degradation, determination of the electrochemical active surface area by means of the method based on the CO-stripping voltammetry curve, catalysts analyses by X-ray diffraction (XRD), and solution analyses by inductively coupled plasma mass spectrometry (ICP-MS) were accomplished.The changes in the structure and stability of Pt/C and Pt-RuOx/C electrocatalysts subjected to 2000 potential scans at different potential ranges (0.05-0.5, 0.05-0.7, and 0.05-0.9 V) were monitored in sulfuric acid solution, in the absence and in the presence of methanol. The influence of application of a constant potential for a prolonged time period was also investigated. As a general behavior, there was increase in particle size, dissolution of catalyst components, and reduction in the electrochemically active surface area. Catalyst degradation was more pronounced in the presence of methanol, and the cyclic potential conditions revealed higher degradation rate compared to the rate observed in constant potential conditions. After a better comprehension of the degradation mechanisms, the second part of this work focused on monitoring the influence of modifications made to the Pechini method during the synthesis of Pt-RuOx/C electrocatalysts on the structure and stability of these catalysts after they were subjected to a large number of potential scans between 0.05 and 0.6 V and at constant potential of 0.6V vs. RHE for a prolonged time period in sulfuric acid 0.5 mol L-1 and in methanol 0.1 mol L-1 solution. DMFC tests were accomplished using membrane electrode assemblies (MEAs) prepared by hot-pressing a pretreated Nafion® 117 membrane together with the Pt-RuOx anode and an E-TEK cathode, in order to compare the catalytic activity of catalysts prepared by different methods. The stability study demonstrated that the catalyst whose resin/carbon support mixture was agitated in a balls mill before being subjected to heat-treatment was more stable than the other prepared catalysts (subjected to ultrasound). The catalysts prepared with the single resin consisting of Pt and Ru, subjected to ultrasound before heat-treatment, furnished the highest power density in the single fuel cell. The third and last part of this work aimed to investigate the effects of the use of Black Pearls 2000 carbon support on the stability and electroactivity of the Pt-RuOx/C catalysts. DMFC tests and potential scans in the presence of methanol were performed, and results were compared with those obtained for the catalysts synthesized with Vulcan XC-72 carbon. Catalysts synthesized with Black Pearls 2000 carbon presented larger electrochemically active surface area compared to catalysts prepared with Vulcan XC-72 carbon using the same procedure. This indicates better metallic particles dispersion on the support, since the amount of Pt was kept constant in the catalysts. This better dispersion of metallic particles on the carbon support resulted in higher power density and current density in the single fuel cell operating with methanol in the liquid phase. The performance of two of the three prepared catalysts was better than that of E-TEK commercial catalyst. The dissolution of the metallic components and the reduction in the electrochemically active surface area was smaller for catalysts prepared with Black Pearls 2000 carbon, and the crystallite size did not change after 2000 potential scans. All these results demonstrate the superior stability of the catalysts prepared with this support.
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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 interaction depend de differents parametres lors de l'impregnation et de l'activation des precurseurs metalliques. Elle est optimale lorsque le catalyseur seche est active par reduction en presence d'hydrogene dilue en montee lente de temperature. En revanche, une calcination prealable a 400c entraine une segregation des metaux. En consequence la formation de l'alliage est inhibee lors de la reduction; neanmoins le degre de reduction du second metal, lorsque celui-ci est difficilement reductible comme dans le cas du rhenium ou de l'etain, est augmente en presence de platine. Ce phenomene peut s'expliquer par une reduction partielle des oxydes de second metal par spillover d'hydrogene en presence de platine. Le chlore ajoute sous forme d'acide chlorhydrique inhibe fortement les interactions platine-rhenium alors que la formation de l'alliage platine-etain n'est pas sensible a cet element. Enfin la nature du complexe mixte et la teneur globale en metaux jouent egalement un role sur l'interaction entre le platine et le second metal
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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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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’établissement d’une modélisation d’un système ternaire, à savoir l’étude préalable des trois bordures binaires, le premier volet de ce travail a été consacré à l’étude des systèmes Pt-Si, Mo-Pt et Mo-Si. Parallèlement au travail d’optimisation, des mesures expérimentales réalisées dans le cadre de cette étude (radiocristallographie, analyse thermique, microsonde,….) ont permis de déterminer les équilibres entre phases, les enthalpies de formation des différents composés intermétalliques ainsi que les mécanismes structuraux responsables des grands domaines de stabilité observés pour certaines phases. La première approche du système ternaire Mo-Pt-Si, obtenue à partir de la banque de données intégrant les optimisations binaires, a permis de cibler et interpréter des expériences de contrôles des équilibres entre phases en condition isotherme et anisotherme. Un nouveau siliciure ternaire a ainsi été découvert et pris en compte dans le calcul. Enfin, à travers de nombreux exemples nous montrons la cohérence de la modélisation avec l’ensemble des données expérimentales
The study on the Mo-Pt-Si system contributes to the knowledge of complex metal alloy, which are intended for applications at high temperatures in the aerospace or glass industries. Its thermodynamic description is difficult because its refractory character related to the presence of the molybdenum and to its complexity due to the high number of the constituents (3 elements). Only an approach of problem by a modelling thermodynamics of CALPHAD type gives to a significant result. As imposes the establishment of a modelling of a ternary system by the study of three binary borders, the first part of this work was devoted to the study of Pt-Si, Mo-Pt and Mo-Si systems. Along with the optimization, an experimental measurements used in this study (X-ray, thermal analysis, microprobe,….) allowed to determine the equilibria phases, the enthalpies of formation of the various intermetallic compounds as well as the structural mechanisms responsible for large domains of stability observed for some phases. The first approach of the Mo-Pt-Si ternary system obtained from the database including the binary optimisations, allowed to interpret the experiments of controls of equilibria phases in isotherm and anisotherm conditions. A new ternary silicide was discovered and took into account in calculation. Finally, through many examples we show the agreement of the modelling with all experimental data
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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 the symmetry breaking point are discussed: below it, above it and at it. These regimes are determined by the existence of four complex eigenvalues below the symmetry breaking point, which collide and coalesce into a pair of complex doubly degenerate eigenvalues at the breaking point. Above the critical value each member of the pair bifurcates into a pair of complex values and now they have a nonzero real part. In the Hermitian case, it is demonstrated that a complete reciprocal energy transfer between the pair of Bragg modes, in a manner similiar to the Pendellösung effect known from X-ray diffraction by a crystal, takes place. When the optical lattice is complex, the dynamics of the energy transfer is completely different from the Hermitian case: below the symmetry breaking point there exist a very nonreciprocal beating-like oscillatory behavior of the energy transfer between the Bragg modes; above the symmetry breaking point the spatial evolution of the energy transfer grows unlimited but an oscillatory evolution still takes place; and at the symmetry breaking point the phenomenon of mode trapping does not occur in this nonparaxial regime (previously seen in PT -symmetric optical lattices in the paraxial regime). For the complex lattice, all these regimes share the common features: existence of a preferable mode for which the energy is transferred and a spatial evolution of this transfer in a nonreciprocal fashion, some of the characteristics very well known of PT -symmetric optical systems.
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A evolução espacial de um par de modos de Bragg ressonantes através de um meio descrito por uma permissividade elétrica relativa PT -simétrica é completamente investigada. Usando o modelo de duas ondas, soluções analíticas para as equações de Maxwell são derivadas no regime não-paraxial a fim de investigar a transferência de energia entre esses modos de Bragg para uma rede ótica Hermitiana bem como para uma rede ótica complexa e também estudar a evolução espacial da parte real do campo elétrico que se propaga através desse meio. Três regimes definidos pela quebra de simetria são discutidos: abaixo, acima e no ponto de quebra de simetria. Estes regimes são determinados pela existência de quatro autovalores complexos distintos abaixo da quebra de simetria, que colidem e coalescem num par de autovalores valores complexos duplamente degenerados no ponto de quebra de simetria. Acima do ponto de quebra, quatro autovalores complexos distintos voltam a existir e agora cada um possui uma parte real não-nula. No caso Hermitiano, é demonstrado que uma transferência de energia completamente recíproca entre o par de modos de Bragg, numa maneira similiar ao efeito Pendellösung conhecido da difração de raios X por cristais, ocorre. Quando a rede ótica é complexa, a dinâmica da transferência de energia é completamente diferente do caso Hermitiano: abaixo do ponto de quebra de simetria existe um comportamento oscilatório do tipo batimento muito não-recíproco para a transferência de energia entre os modos de Bragg; acima do ponto de quebra de simetria a evolução espacial da transferência de energia cresce ilimitadamente mas um evolução oscilatória ainda ocorre; no ponto de quebra o fenômeno do aprisionamento de modo não ocorre nesse regime não-paraxial (anteriormente visto em redes óticas PT -simétricas no regime paraxial). Para a rede ótica complexa, todos estes regimes compartilham características em comum: existência de um modo preferencial para o qual a energia é transferida e uma evolução espacial dessa transferência de maneira não-recíproca, algumas das características muito bem conhecidas de sistemas óticos PT simétricos.
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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 roughening of the surface during ox- idation/reduction cycles, which is due to the fact that the surface is unlikely to recrystallise into the more open (100) surface structure. In essence, although the Pt surfaces with a more open atomic geometry, e.g. (100) and (110), are more reactive than the close-packed (111) surface, they are intrinsically less stable. The bimetallic alloy Pt3Ni(111) surface has been shown to be over 10 times more ac- tive for the ORR than pure Pt(111) and exhibits a compositional oscillation at the surface which is formed of Pure Pt. Upon repetitive cycling the Pt3Ni(111) surface undergoes a similar morphological change to that of Pt(111), where the formation of adislands was seen in STM measurements. These adislands retain some of the active segregated surface structure, preserving the electronic modi�cation due to the Ni-rich subsurface. This leads to a stable surface that remains more active than the pure Pt(111) electrode after prolonged cycling of the potential into the region of oxidation/reduction. Perhaps the key insight that can be obtained from these experiments is that electrode activity towards the ORR is intrinsically linked to surface stability, i.e. the more active the surface, the less stable it is. This, in fact, may be a general e�ect in electrocatalysis.
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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
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 majoritÃria do Partido faz a defesa da gestÃo e segue as orientaÃÃes do Poder Executivo para as votaÃÃes no Congresso Nacional. Essa dinÃmica de conflitos entre PT e governo Lula (2003-2006) constitui meu objeto de estudo. Busco entender as razÃes dos conflitos entre esses agentes. A investigaÃÃo percorreu diversas fontes, dentre as quais se destacam: notÃcias veiculadas na imprensa (Folha de SÃo Paulo impresso e on-line), periÃdicos do PT e de suas tendÃncias, sites vinculados aos personagens e instituiÃÃes da pesquisa (PT e suas tendÃncias, parlamentares), documentos partidÃrios (resoluÃÃes, notas, manifestos), textos acadÃmicos referentes ao assunto, revistas, etc. No que diz respeito ao arcabouÃo teÃrico, conceitos como trade-off eleitoral, âlinha polÃticaâ e âcoalizÃo dominanteâ foram tomados como essenciais para a anÃlise do material empÃrico e elaboraÃÃo dos argumentos. Para alÃm da disputa entre projetos e perspectivas ideolÃgicas, os conflitos entre petistas e governo expressavam tambÃm os distintos parÃmetros de aÃÃo que orientavam os agentes polÃticos. A esquerda petista e o grupo dominante no PT pautaram a relaÃÃo com os dirigentes governamentais atravÃs de distintos parÃmetros.
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Libros sobre el tema "Pt"

1

Group, Yayasan Humpuss, ed. Menggali potensi membangun negeri: Humpuss mengabdi. [Jakarta: Yayasan Humpuss Group, 1994.

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Samosir, Osbin. Salus populi dari Tano Batak: Studi kebijakan pemerintah pusat atas konflik Indorayon (PT IIU/PT TPL) pada periode 1998-2003. [Jakarta]: Jala Permata, 2008.

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Rani, Ina Meutia y Ina Meutia Rani. Catatan sejarah 55 tahun =: History of Pelni and chronology of events in 55 years. Jakarta: Pelni, 2007.

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Utomo, Y. Priyo. 20 tahun Penerbit PT Gramedia Pustaka Utama, 1974-1994. [Jakarta]: Gramedia Pustaka Utama, 1994.

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Zaenuddin, Akhmad. Fenomena geologi semburan lumpur Sidoarjo. Bandung: Badan Geologi, Kementerian Energi dan Sumber Daya Mineral, 2010.

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Butler, Charlotte. Dare to do: The story of William Soeryadjaya and PT Astra International. Singapore: McGraw Hill, 2002.

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Bernfeld, G. J., A. J. Bird, R. I. Edwards, Hartmut Köpf, Petra Köpf-Maier, Christoph J. Raub, W. A. M. te Riele, Franz Simon y Walter Westwood. Pt Platinum. Editado por Gary J. K. Acres y Kurt Swars. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-662-10278-7.

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Belin, Esther, Yvette Cauchois, Christiane Sénémaud, Jean Blaise, Jean-François Wyart, Helmut Münzel y Joachim Wagner. Pt Platinum. Editado por Dieter Koschel y Joachim Wagner. Berlin, Heidelberg: Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-09377-1.

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Maurer, Tracy. PT Cruiser. Vero Beach, FL: Rourke Pub., 2008.

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André, Singer. O PT. São Paulo, SP: Publifolha, 2001.

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Capítulos de libros sobre el tema "Pt"

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Moritz, W. "5.8.21 Pt". En Physics of Solid Surfaces, 215–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47736-6_76.

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Lichtin, Alan. "Prolonged PT". En The Coagulation Consult, 51–56. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-9560-4_3.

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Gooch, Jan W. "Carlona Pt". En Encyclopedic Dictionary of Polymers, 120. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1975.

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Macintyre, J. E. "Pt Platinum". En Dictionary of Organometallic Compounds, 273–82. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-6847-6_40.

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Steiner, G. y C. Zimmerer. "Polythiophene (PT)". En Polymer Solids and Polymer Melts – Definitions and Physical Properties I, 1121–26. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32072-9_130.

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Ross, Robert B. "Platinum Pt". En Metallic Materials Specification Handbook, 269–70. Boston, MA: Springer US, 1992. http://dx.doi.org/10.1007/978-1-4615-3482-2_32.

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MacIntyre, Jane E. "Pt Platinum". En Dictionary of Organometallic Compounds, 186–94. Boston, MA: Springer US, 1996. http://dx.doi.org/10.1007/978-1-4899-6848-7_43.

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Nagy, Zoltán. "Pt—Platinum". En Electrochemical Synthesis of Inorganic Compounds, 384. Boston, MA: Springer US, 1985. http://dx.doi.org/10.1007/978-1-4899-0545-1_51.

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Macintyre, J. E., F. M. Daniel, D. J. Cardin, S. A. Cotton, R. J. Cross, A. G. Davies, R. S. Edmundson et al. "Pt Platinum". En Dictionary of Organometallic Compounds, 152–60. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4757-4966-3_44.

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Castroviejo, Ricardo. "Platinum (Pt)". En A Practical Guide to Ore Microscopy—Volume 1, 555–61. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-12654-3_94.

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Actas de conferencias sobre el tema "Pt"

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Калинин, И. А., И. В. Росляков y К. С. Напольский. "Рекристаллизация тонких пленок Pt и Pt-Rh". En XXVIII Российская конференция по электронной микроскопии и VI школа молодых учёных "Современные методы электронной, зондовой микроскопии и комплементарные методы в исследованиях наноструктур и наноматериалов". Crossref, 2020. http://dx.doi.org/10.37795/rcem.2020.69.70.049.

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Shafiei, M., J. Yu, M. Breedon, A. Moafi, Kourosh Kalantar-Zadeh, W. Wlodarski, R. B. Kaner y K. Galatsis. "Pt/MoO". En 2010 Ninth IEEE Sensors Conference (SENSORS 2010). IEEE, 2010. http://dx.doi.org/10.1109/icsens.2010.5690245.

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Ananthanarayan, Swamy, Miranda Sheh, Alice Chien, Halley Profita y Katie Siek. "Pt Viz". En CHI '13: CHI Conference on Human Factors in Computing Systems. New York, NY, USA: ACM, 2013. http://dx.doi.org/10.1145/2470654.2466161.

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Chan, Yee Seng, Hwee Tou Ng y Zhi Zhong. "NUS-PT". En the 4th International Workshop. Morristown, NJ, USA: Association for Computational Linguistics, 2007. http://dx.doi.org/10.3115/1621474.1621528.

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Gu, Yufei, Qingchuan Zhao, Yinqian Zhang y Zhiqiang Lin. "PT-CFI". En CODASPY '17: Seventh ACM Conference on Data and Application Security and Privacy. New York, NY, USA: ACM, 2017. http://dx.doi.org/10.1145/3029806.3029830.

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Tomotani, Miki, Hiroshi Ashida, Yasuyuki Goto y Seigen Otani. "Evaluation of Pt/PZT/Pt Capacitors Using SIMS". En ISTFA 1998. ASM International, 1998. http://dx.doi.org/10.31399/asm.cp.istfa1998p0185.

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Abstract Ferro-electric thin film materials have been used for nonvolatile random access memories(FRAM*). PZT(Pb(Ti,Zr)O3) is one of several promising materials for use as a FRAM capacitor in combination with a platinum film as an electrode. However the ferroelectric properties of this capacitor are degraded by commonly used LSI processes, such as a passivation/ insulator(CVD-SiO2) process. Recently, mechanisms of process degradation are being investigated**,***, but are not clearly understood yet. For example, to our knowledge the existence of hydrogen in the capacitor after an annealing in hydrogenous atmosphere has not yet been measured by analytical methods. As a result in this study, we measured electrical properties of Pt/PZT/Pt capacitors after a 7.6 torr N2-H2 annealing at various hydrogen partial pressures and temperatures. Then we measured composition profiles of these capacitors by Secondary Ion Mass Spectrometry(SIMS). We found that after the N2-H2 annealing, the non-volatile polarization(Pnv)(uC/cm2) of the capacitors rapidly decreased under the presence of hydrogen at lower temperatures. At the same time, SIMS profiles showed that hydrogen concentration increased in the PZT film, and oxygen concentration decreased in the upper Pt film. We considered that the increase of hydrogen in the PZT film causes the degradation of electric properties, and the decrease of oxygen in the Pt film makes the adhesion force between the upper platinum electrode and the PZT film weaker. Moreover we found that the degradation can be eliminated by annealing in oxygen at temperatures as high as 400 °C.
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Abunahla, Heba, Baker Mohammad, Anas Alazzam, Maguy Abi Jaoude, Mahmoud Al-Qutayri y Said F. Al-Sarawi. "Nonenzymatic Glucose Sensor Using MIM Pt/CuO/Pt". En 2018 30th International Conference on Microelectronics (ICM). IEEE, 2018. http://dx.doi.org/10.1109/icm.2018.8704078.

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Halawa, M. "Performance, Thermoelectric Homogeneity and Stability of Au/Pt and Pt-10 %Rh/Pt Thermocouples". En TEMPERATURE: Its Measurement and Control in Science and Industry; Volume VII; Eighth Temperature Symposium. AIP, 2003. http://dx.doi.org/10.1063/1.1627171.

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Tywoniuk, Konrad. "Nuclear effects in the Glauber-Gribov model". En High-pT physics at LHC. Trieste, Italy: Sissa Medialab, 2008. http://dx.doi.org/10.22323/1.045.0035.

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Ulery, Jason. "Three-Particle Azimuthal Correlations". En High-pT physics at LHC. Trieste, Italy: Sissa Medialab, 2008. http://dx.doi.org/10.22323/1.045.0036.

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Informes sobre el tema "Pt"

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Trahan, Corey, Jing-Ru Cheng y Amanda Hines. ERDC-PT : a multidimensional particle tracking model. Engineer Research and Development Center (U.S.), enero de 2023. http://dx.doi.org/10.21079/11681/48057.

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This report describes the technical engine details of the particle- and species-tracking software ERDC-PT. The development of ERDC-PT leveraged a legacy ERDC tracking model, “PT123,” developed by a civil works basic research project titled “Efficient Resolution of Complex Transport Phenomena Using Eulerian-Lagrangian Techniques” and in part by the System-Wide Water Resources Program. Given hydrodynamic velocities, ERDC-PT can track thousands of massless particles on 2D and 3D unstructured or converted structured meshes through distributed processing. At the time of this report, ERDC-PT supports triangular elements in 2D and tetrahedral elements in 3D. First-, second-, and fourth-order Runge-Kutta time integration methods are included in ERDC-PT to solve the ordinary differential equations describing the motion of particles. An element-by-element tracking algorithm is used for efficient particle tracking over the mesh. ERDC-PT tracks particles along the closed and free surface boundaries by velocity projection and stops tracking when a particle encounters the open boundary. In addition to passive particles, ERDC-PT can transport behavioral species, such as oyster larvae. This report is the first report of the series describing the technical details of the tracking engine. It details the governing equation and numerical approaching associated with ERDC-PT Version 1.0 contents.
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Cali, George J. y Nathan S. Lewis. Fabrication and Characterization of Pt and Pt-Ir Ultramicroelectrodes. Fort Belvoir, VA: Defense Technical Information Center, mayo de 1992. http://dx.doi.org/10.21236/ada251092.

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Lewis, Nathan S. Fabrication and Characterization of Pt and Pt-Ir Ultramicroelectrodes. Fort Belvoir, VA: Defense Technical Information Center, mayo de 1992. http://dx.doi.org/10.21236/ada251111.

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Smotkin, Eugine. Density Functional Theory Applied to Pt and Pt Alloy Clusters and Adsorbate. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 2001. http://dx.doi.org/10.21236/ada395193.

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Cam-Winget, N. y P. Sangster. PT-EAP: Posture Transport (PT) Protocol for Extensible Authentication Protocol (EAP) Tunnel Methods. RFC Editor, mayo de 2014. http://dx.doi.org/10.17487/rfc7171.

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Daughton, James M., Cathy Nordman, Dave Brownell y Dan Reed. PT Spin Dependent Tunneling Sensor. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 1999. http://dx.doi.org/10.21236/ada370287.

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Saxena, Avadh. PT-Symmetric Kagome Lattices and Localization. Office of Scientific and Technical Information (OSTI), junio de 2017. http://dx.doi.org/10.2172/1363733.

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Stephan, Elle Taylor y John Arnold Balog. Process Engineering Workshop PT-2 Machining. Office of Scientific and Technical Information (OSTI), abril de 2018. http://dx.doi.org/10.2172/1435545.

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Colletti, Lisa y Elmer Lujan. IAEA PT sample results and analysis. Office of Scientific and Technical Information (OSTI), agosto de 2023. http://dx.doi.org/10.2172/1994093.

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Tsirtsis, G. y P. Srisuresh. Network Address Translation - Protocol Translation (NAT-PT). RFC Editor, febrero de 2000. http://dx.doi.org/10.17487/rfc2766.

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