Submitted by Maicon Juliano Schmidt (maicons) on 2015-07-08T19:29:46Z No. of bitstreams: 1 Kelli Teixeira da Silva.pdf: 3210676 bytes, checksum: cf3cc015d7dee153e881609612499e63 (MD5) / Made available in DSpace on 2015-07-08T19:29:46Z (GMT). No. of bitstreams: 1 Kelli Teixeira da Silva.pdf: 3210676 bytes, checksum: cf3cc015d7dee153e881609612499e63 (MD5) Previous issue date: 2013-01-31 / Nenhuma / A presente dissertação intitulada "A qualificação profissional na área da deficiência visual do Instituto Benjamin Constant: uma análise na perspectiva dos professores" tem por objetivo conhecer e compreender as diretrizes político-pedagógicas que orientam a proposta de qualificação docente do Instituto Benjamin Constant/Rio de Janeiro na dimensão do Curso de Qualificação de Professores na Área da Deficiência da Visão; na perspectiva dos professores que nele trabalharam no contexto da edição do ano de 2012. A razão por escolher este curso e esses professores como colaboradores da pesquisa se deve, entre outros motivos, ao fato de que esse curso engloba em sua grade curricular todos os demais cursos de curta duração oferecidos pelo Instituto Benjamin Constant durante o ano. Além, é claro, da relevância social dos serviços prestados pelo IBC, no que diz respeito à deficiência visual. Pois, além de capacitar profissionais, o instituto atende um número expressivo de pessoas cegas e com baixa visão; possui uma escola; presta assessoria a escolas e instituições; realiza consultas oftalmológicas à população; reabilita; produz material especializado; impressos em Braille; publicações científicas. Um dos princípios teórico-metodológicos que fundamenta a presente pesquisa refere-se à perspectiva histórico-cultural. Significa compreender a pesquisa como relação dialógica entre sujeitos em que, o pesquisador e os atores colaboradores, juntos buscam construir sentidos para o fenômeno pesquisado. A partir desta perspectiva, mais do que simplesmente realizar uma análise do que foi dito ou percebido, buscou-se compreender o processo de formação que é realizado nesse contexto. O processo analítico partiu da análise de conteúdo e teve como fonte principal as entrevistas semiestruturadas e os documentos pesquisados. Esse processo foi concluído por meio da interpretação das evidências coletadas à luz dos marcos conceituais nos quais embaso este estudo. As considerações finais se expressam numa síntese interpretativa das três categorias analíticas que emergiram desse processo: Relação IBC/MEC; Diretrizes Político-Pedagógicas do CURSÃO e CURSÃO: Significados e expectativas. / The present dissertation titled “The institute Benjamin Constant: Analysis of the proposal for professional qualification in the field of Visual Impairment from the teacher’s perspective” has the objective get to know and comprehend the political pedagogy guidelines to the teaching qualification of the IBC (Benjamin Constant Institute)/Rio de Janeiro in the extension of the Teachers Qualification Course in the field of Visually Impairment, (acronym: CURSÃO); from the perspective of its teachers from the 2012 edition. The reason for choosing this course and these teachers as allies on the research is due to the course embracing in its curricular schedule all other short-duration courses offered by the Institute during the year, besides the social relevance of the IBC when relating the Visually Impaired People. Therefore, besides training professionals the Institute assists a large number of blind and visually impaired ones, it has a school; advises other schools and institutions; holds ophthalmology appointments to the population; rehabilitates; produces specialized material printed in Braille; scientific publications. One of the theoretical and methodological principles that basis the present research refers to the historical and cultural perspective. It means to understand the research as a dialogical relationship between subjects, where the researcher and the collaborators seek for purposes to the present study together. Beyond this perspective of what has been said and realized, we tried to comprehend the process of formation that is made in this context. The analytic process began on the content analysis and had as main source the semi-structured interviews and the documents found. This process concluded through the interpretation of the collected evidences under the concept landmarks in which I based this study. The final considerations are shown in an interpretative synthesis of the three analytic categories that appeared from this process: Relation IBC/Ministry of Education; Political Pedagogy Guidelines of the CURSÃO and CURSÃO: meanings and expectations.

Le « père de l'histoire whig » Thomas Babington Macaulay a été dès son vivant, et après sa mort, traduit dans nombre de pays, en Europe (Allemagne, France, Pays-Bas), comme hors des frontières européennes (Mexique). Incarnant à partir de la fin du XIXe siècle une histoire libérale progressiste et surtout non scientifique, attaquée par les historiens « professionnels », il n'en demeure pas moins très présent dans les manuels scolaires et universitaires jusqu'après la Seconde Guerre mondiale voire jusque dans les discours politiques contemporains. En 1931, puis en 1944, Herbert Butterfield tente de définir son interprétation de l'histoire. Ce dernier veut démontrer comment action politique et vision de l'histoire whigs incarnent un modèle, pragmatique, réformiste, à l'antithèse du modèle révolutionnaire français, qui explique l'exceptionnelle stabilité politique anglaise, britannique voire impériale du Royaume-Uni, depuis la Glorieuse Révolution. Dès lors les successeurs de Butterfield, en premier lieu J. G. A. Pocock et John Burrow, éclairent cette tradition libérale whig, devenue nationale, bientôt synonyme d'interprétation burkéenne de l'histoire. Pourtant, en s'appuyant sur le dialogue entre libéraux britanniques (whigs comme Millar, Mackintosh, utilitaristes comme les Mill, père et fils) et libéraux français (comme Constant, Guizot et Tocqueville), illustrant par ailleurs les riches échanges entre Royaume-Uni et France au XIXe siècle – avant que l’oeuvre de Macaulay ne soit que très épisodiquement traduite et commentée au XXe siècle en France –, et sur une étude minutieuse des écrits de Macaulay portant sur la Révolution française, cette thèse entend démontrer qu'au - delà de la division politique du parti whig lors de la période révolutionnaire, l'histoire whig de Macaulay incarne une pensée politique, une interprétation des révolutions anglaises et françaises et une philosophie libérale de l'histoire nouvelles rompant avec Hume et avec Burke. En mettant au coeur de l'histoire l'émancipation politique et religieuse des individus, Macaulay défend la démocratisation et la laïcisation des sociétés et illustre une histoire libérale post-Révolutionnaire, un nouveau paradigme whig, qui ne peuvent être qualifiés de conservateurs ni de contre-Révolutionnaires. / The "father of Whig History", Thomas Babington Macaulay, was, during his lifetime and after his death,translated in numerous European countries ( Germany, France, The Netherlands ) as well as outside Europe(Mexico). Embodying, from the end of the nineteenth century, a liberal, progressive and especially nonscientifichistory, denounced by "professional " historians, he remained no less highly present in school anduniversity textbooks up to the Second World War, and even in contemporary and current political speeches.In 1931, and then in 1944, Herbert Butterfield attempted to define his interprétation of history and sought todemonstrate how political action and historical vision embody a pragmatic and reformist model, theantithesis of the French revolutionary model, which explains the exceptional English, British, even imperial,political stability of Great Britain since the Glorious Revolution. Since then, Butterfield's successors, andfirst among them, J. G. A. Pocock and John Burrow, have been shedding light on this liberal, becomenational, whig tradition, soon to be synonymous with the Burkean interpretation of history. However, basedon the dialogue between British liberals ( Whigs such as Millar and Mackintosh, Utilitarians such as theMills, father and son ), and French liberals ( such as Constant, Guizot and Tocqueville), while illustrating inother respects the fruitful exchange between Great Britain and France during the nineteenth century - beforeMacaulay's work was only very episodically translated and commented on in the twentieth century in France- and on a thorough exploration of Macaulay's work on the French Revolution, this study intends todemonstate that beyond the political division of the Whig party during the revolutionary period, Macaulay'sWhig history sanctions a new line of political thought, a new interprétation of the English and FrenchRévolutions and liberal philosophy of history, breaking with Hume and Burke. By placing the political andreligious emancipation of individuals at the heart of history, Macaulay defended the democratization and thesecularization of society and illustrated a post-Revolutionary liberal history, a new Whig paradigm, thatcannot be called conservative nor counter- revolutionary.

Denna rapport är ett examensarbete på C-nivå som görs i sammarbete med teknikkonsulten Ramböll. Det vanligaste sättet att ventilera en byggnad idag är med så kallad CAV-ventilation (Constant Air Volume). Denna metod bygger på att ett luftflöde bestäms för rummet och upprätthålls med konstant flöde. En annan metod är så kallad VAV (Variable Air Volume) som bygger på att flödet varierar efter behovet. Anledningen till varför man väljer VAV istället för CAV är att med CAV finns det ofta en stor risk att man överventilerar ett rum eller byggnad, just på grund av att flödet är konstant. Problemet med VAV är att det är en högre investeringskostnad än för CAV så metoden lämpar sig bara där energibesparingen är så stor så den täcker mellanskillnaden i pris. Denna utredning visar i vilka typer av rum som det kan löna sig att installera VAV istället för det traditionella CAV-systemet. För att undersöka detta sker simuleringar av fiktiva modeller i programmet IDA Indoor Climate & Energy (IDA). IDA är ett simuleringsverktyg som används till att simulera den termiska komforten i byggnader samt byggnadens energianvändning. De olika rumstyperna som simuleras är: klassrummet, kontoret och mötesrummet. De olika fallen är utformade så att de liknar så som de ser ut i verkligheten både till geometri och nyttjandegrad. Om något av fallen visade sig vara en bra kandidat för att förse med VAV fortsätter utredningen med att fastställa hur stort bör flödet vara för att energibesparingen ska bli så stor så att det täcker investeringskostnaden. Den ekonomiska kalkyleringen sker både med en livscykelkostnadsanalys och med en enklare återbetalningstidskalkyl. Resultatet för simuleringarna visade att den enda rumstypen i denna utredning som var lönsam var mötesrummet. Klassrummet och kontoret visade sig båda ge en förlust. Detta var eftersom nyttjandegraden för dessa rum var så pass hög så att ventilationen med VAV var igång nästan lika mycket som för CAV. För mötesrummet var nyttjandegraden betydligt lägre vilket innebar att energibesparingen blev så pass hög att den täckte den höga investeringskostnaden. För mötesrummet gjordes sedan en flödesanalys som visade att rummets luftflöde bör vara dimensionerat för mellan omkring 20 – 30 personer för att vara en lönsam investering.

The objective of my thesis was to develop novel techniques and methods to probe the dielectric properties of biomembranes in air and their natural environment - liquid solution. The dielectric constant ε(r) of biomembranes is a parameter especially important in cell electrophysiology as it ultimately determines the ion membrane permeability, the membrane potential formation or the action potential propagation velocity, among others. However, no technique is able to provide this quantity with the required nanoscale spatial resolution and in electrolyte solution. AFM is an extremely versatile tool to investigate electric properties at the nanoscale, and hence constitutes a good candidate technique to approach the quantification of the nanoscale dielectric properties of biomembranes. Although a few AFM techniques exist, capable of investigating polarization properties, it remains difficult to extract quantitative values of εr from the measurements, especially in liquid environment. One reason for this is on the instrumental side, since for studies at the nanoscale very small quantities have to be measured, that can be easily overwhelmed by electronic noise as it maybe for example the case in current sensing based techniques. Electrostatic Force sensing techniques may in principle have an advantage here, since the used cantilevers for force detection are extremely sensitive and naturally, undesired nonlocal electrical signals from the cantilever are suppressed. Another important aspect is attributed to a lack of sufficiently precise quantitative models to relate measured force with the dielectric constant value of the sample. Indeed, for measurements on insulating substrates like mica or glass that are sometimes required for biological samples, still no quantitative model is available. Moreover, successful measurements of dielectric properties in liquid media, that is fundamental for the functionality of some biological samples, has not been shown until now. As consequence of the existing limitations for quantitative dielectric imaging the objectives of this work were to extend the quantitative capabilities of Electrostatic Force Microscopy to image the dielectric constant of biomembranes with nanoscale spatial resolution. In particular, the three objectives I addressed in the work are: 1. To evaluate the possibility to perform quantitative dielectric measurement on biomembranes on metallic substrates and in air with Electrostatic Force Microscopy that may offer higher precision with respect to current sensing techniques. 2. To extend the applicability of quantitative dielectric measurement to the case of thick insulating substrates in order to facilitate its use with biomembranes that cannot be prepared on metallic substrates. 3. To develop a setup for dielectric imaging in liquid environment based either on current detection or on the principles of electrostatic force microscopy. Finally to perform nanoscale dielectric measurements on bio-membranes in their natural liquid environment. How each of these objectives could be reached is detailed in my thesis. / El objetivo de mi tesis era desarrollar nuevas técnicas y métodos para medir las propiedades dieléctricas de biomembranas en aire y en su medio natural, es decir, en solución líquida. La constante dieléctrica (εr) de las biomembramas es un parámetro especialmente importante en la electrofisiología celular, ya que fundamentalmente determina la permeabilidad iónica de la membrana, la formación del potencial de membrana o la velocidad de propagación del potencial de acción, entre otros. El AFM es una herramienta extremadamente versátil para investigar propiedades eléctricas a nanoescala, y por ello constituye una buena técnica candidata para la cuantificación de las propiedades dieléctricas de las biomembranas a nanoescala. Aunque existen algunas técnicas basadas en el AFM capaces de investigar las propiedades de polarización, continúa siendo difícil extraer valores cuantitativos de εr de las medidas, especialmente en medio líquido. Una de las razones radica en la parte instrumental, ya que para los estudios en la nanoescala tienen que medirse cantidades muy pequeñas, y este proceso puede verse entorpecido por ruido electrónico como puede ser el caso, por ejemplo, en las técnicas basadas en la detección de corriente eléctrica. En principio, las técnicas de detección de fuerza electroestática disponen aquí de una ventaja, ya que las sondas utilizadas para la detección de la fuerza son extremadamente sensibles y naturalmente se suprimen señales eléctricas no locales y no deseadas. Otro aspecto importante se atribuye a la falta de modelos cuantitativos suficientemente precisos para relacionar la fuerza medida con el valor de la constante dieléctrica de la muestra. En realidad, para realizar medidas en sustratos aislantes como son la mica o el vidrio, que a veces son necesarios para muestras biológicas, todavía no se dispone de ningún modelo cuantitativo. Por otra parte, hasta ahora no se han publicado medidas de propiedades dieléctricas en medio líquido, que para algunas muestras biológicas es fundamental para mantener la funcionalidad. Como consecuencia de las limitaciones existentes de las medidas dieléctricas, el objetivo de este trabajo fue extender las capacidades cuantitativas de la Microscopía de Fuerzas Eletroestáticas para hacer imágenes dieléctricas de biomembranas con resolución espacial a nanoescala en substratos conductores, aislantes y en medio líquido.

The Henry's law constant is important in the gas-liquid mass transfer process. This study investigates the apparent dimensionless Henry's law constant, also known as the gas-liquid partition coefficient (K'H), of both hydrophilic (methanol, isopropanol and acetone) and hydrophobic (toluene and p-xylene) organic compounds. The K'H in deionized (DI) water, wastewater with a maximum total dissolved organic carbon (DOC) content of 700 mg/L, and DI water mixed with a maximum activated sludge suspended solid (SS) concentration of 40,000 mg/L, are measured by the single equilibrium technique (SET) at 288 K, 293 K, 298 K and 303 K. Experimental results indicate that the K'H of the three tested volatile organic compounds (VOCs) varies according to three situations. First, the K'H of the hydrophilic compounds in mixed liquor with the maximum suspended solid concentration is higher than that in DI water. The maximum rates of increase of K'H from KH in the SS range between 288 K and 303 K are 27.2% for methanol, 23.5% for isopropanol and 16.1% for acetone. Second, the K'H values for toluene and p-xylene are lower than those in DI water. Between 288 K and 303 K, the maximum reduce rate of K'H from KH in the SS range are 87.3% for toluene and 93.0% for p-xylene. Third, the K'H values of all of the test compounds in the wastewater are lower than those in DI water. The maximum rates of decrease of K'H from KH in the DOC concentration range between 288 K and 303 K are 1.2% for methanol, 1.1% for isopropanol, 1.7% for acetone, 14.3% for toluene and 20.1% for p-xylene. A model is presented to related K'H to wastewater DOC and concentration of SS in the activated sludge, using an organic carbon-water partition coefficient (KOC) and activated sludge-water partition coefficient (KSS) as model parameters. The model is verified, and model parameters for test compounds are estimated. Temperature variations of K'H can be regressed using van't Hoff's equation. The gas-water phase change enthalpy £GH'gw rises approximately linearly with increasing SS for hydrophobic toluene and p-xylene. K'H variation can be controlled by SS concentration and temperature in activated sludge system. The temperature effect of KOC and KSS are also observed. KOC and KSS decrease with as the temperature rises from 288 K to 303 K. The VOCs phase change enthalpy and entropy can be calculated using thermodynamic analysis. The partition of VOCs into the organic carbon phase releases energy, and thus prefers low temperatures. Lower temperatures and higher SS concentrations lead to lower K'H for hydrophobic VOCs, while higher SS concentrations result in higher K'H for hydrophilic VOCs. Organic-rich wastewater or low-biomass mixed liquor can successfully remove hydrophilic VOCs from contaminated air streams by bioscrubber. However, bioreactors scrubbed with high biomass-containing mixed liquor perform better than regular activated sludge concentration in removing hydrophobic VOCs. The experimental results thus support the design and operation of bioscrubber and suspended operable bioreactors.

Ce mémoire est consacré à l’analyse du mensonge chez Kant. Or, comme la Métaphysique des moeurs est subdivisée en deux volets, le premier portant sur le droit et le second sur la moralité proprement dite, nous nous sommes proposé d’envisager le mensonge selon ces deux points de vue, en commençant par le second. En nous appuyant sur les textes de Kant qui envisagent le mensonge comme faute morale, les Leçons d’éthique, la Fondation de la Métaphysique des Moeurs, la Doctrine de la Vertu, nous montrons que Kant condamne moralement le mensonge parce qu’en lui-même, le mensonge constitue la plus grave violation du devoir de l’homme envers lui-même : la sincérité. L’homme qui n’est pas sincère, c’est-à-dire qui dit délibérément le contraire de ce qu’il pense non seulement va à l’encontre de la finalité inhérente à la communication, mais aussi, par le mensonge, l’homme renonce à sa personnalité. En renonçant ainsi à sa personnalité, l’homme cesse d’être un homme véritable, c’est-à-dire celui en qui la pensée et le dit coïncident, il devient un semblant d’homme, c’est-à-dire celui qui délibérément dit le contraire de ce qu’il pense. En s’appuyant sur le texte de Kant qui envisage le mensonge au point de vue du droit, D’un prétendu droit de mentir par humanité, nous avons mis en évidence que l’argument central de Kant est de montrer que toute tentative de tolérer un droit de mentir rendrait la société impossible. C’est qu’un droit de mentir condamnerait à jamais l’humanité à l’état de nature, parce que la confiance qu’exige le contrat originel qui marque l’entrée dans l’état de droit n’aurait plus aucun sens. De même, un droit de mentir ruinerait tous les contrats, qui reposent, pour leur effectivité, sur la confiance. Au fond, un droit de mentir est contraire même au droit. Nous avons montré en conclusion de mémoire en quoi la position de Kant restait encore, de nos jours, actuelle. Une grande partie de ce mémoire a été réservée au texte polémique de 1796 D’un prétendu droit de mentir par humanité. Ayant montré en quoi consiste la position de Kant, contrairement à celle de Constant, nous avons analysé les nombreux commentaires qui ont été consacrés à ce texte polémique, qui opposa Kant et Benjamin Consstant, afin de montrer que l’interprétation de la position de Kant sur le mensonge varie selon qu’on revendique exclusivement sa philosophie morale ou sa philosophie du droit. / This essay is dedicated to the analysis of Kant’s thought on the notion of lying. As the Métaphysique des moeurs is divided in two parts, the first dealing with the second on morality, the essay treats the lie through these two angles. Based on Kant’s texts discussing the lie as a moral fault, i.e. the Leçons d’éthique, the Fondation de la Métaphysique des Moeurs and the Doctrine de la Vertu, one can note that Kant morally condemns lying mainly because it constitutes, in itself, the most serious violation of the human’s duty towards himself: sincerity. The individual who is not sincere, that is to say who deliberately says the opposite of what he thinks, not only goes against the inherent purpose of communication but also abandons his personality. In so doing, the human ceases to be a real human, that is to say where his thought and saying coincides, and becomes a semblance of human, namely someone who deliberately says the opposite of what he thinks. Referring to Kant’s treatment of lying from a legal point of view, i.e. D’un prétendu droit de mentir par humanité, one sees the idea that any attempt to tolerate a right to lie would make society impossible. Indeed, a right to lie would forever condemn humanity to a state of nature in that the confidence that is required in the original contract, marking the transition to a rule of law, would loss its meaning. In addition, a right to lie would ruin all contracts that rest, for their efficiency, on confidence. In other words, a right to lie is also contrary to law. The essay ends by showing how Kant’s position still holds meaning in the present world. A major part of this essay focuses on the controversial text of 1796, entitled D’un prétendu droit de mentir par humanité. While having shown of what consists Kant’s position, contrary to that of Constant, we analyzed many commentaries which were devoted to this polemical text, opposing Kant and Benjamin Constant, in order to show that the interpretation of the position of Kant on lying varies according to whether his moral philosophy or his philosophy of the right is exclusively mobilized.

Submitted by Renata Lopes (renatasil82@gmail.com) on 2016-05-11T14:55:39Z No. of bitstreams: 1 marcoantoniobarrosofaria.pdf: 1191287 bytes, checksum: 73d2d8e10c93a3c449aae74230b03ebf (MD5) / Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2016-06-20T20:55:11Z (GMT) No. of bitstreams: 1 marcoantoniobarrosofaria.pdf: 1191287 bytes, checksum: 73d2d8e10c93a3c449aae74230b03ebf (MD5) / Made available in DSpace on 2016-06-20T20:55:11Z (GMT). No. of bitstreams: 1 marcoantoniobarrosofaria.pdf: 1191287 bytes, checksum: 73d2d8e10c93a3c449aae74230b03ebf (MD5) Previous issue date: 2013-02-06 / CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / A presente tese versa sobre a questão do sentimento religioso na obra de Benjamin Constant de Rebecque. Defendemos que a teoria crítica formulada por esse autor a respeito da autonomia do fenômeno religioso se aproxima muito daquela teoria defendida por alguns autores pós e neokantianos, graças à aproximação do autor francês com alguns filósofos românticos e à própria leitura que Constant havia feito das obras kantianas. Pretendemos com esta tese descortinar, claro que modestamente, uma faceta ainda desconhecida de Constant de Rebecque no Brasil, ou seja, a de um filósofo da história e também da religião. Para isso, trataremos do período histórico e das ideias com as quais nosso pensador travou contato durante seu período de formação intelectual. / Cette thèse a pour sujet la question du sentiment religieux dans l'oeuvre deBenjamin Constant Rebecque. On croit que la théorie critique qu'il a formulé sur l'autonomie du phénomène religieux est très proche de la théorie défendue par certains auteurs post et neokantiens. Cela grâce à son approche avec quelques philosophes romantiques et voire à lecture que Constant avait fait de l'oeuvre de Kant. On envisage dans cette thèse de dévoiler une facette encore inconnue de Constant Rebecque au Brésil, celle d'un philosophe de l'histoire et de la religion. Pour cela, on discutera de la période historique et des idées que le philosophe a fait la connaissance au cours de sa formation intellectuelle.

Initiée par les travaux des lauréats du prix Nobel Krogh et Hill l’étude de l’adaptation du système cardiorespiratoire lors de la transition du repos à l’exercice représente un champ majeur en physiologie de l’exercice. En début d’effort, la consommation d’oxygène (VO2) doit rapidement s’adapter afin de minimiser le déficit en dioxygène (O2), les perturbations intracellulaires et par conséquent optimiser la performance. Pendant cette phase dite « cardiodynamique » le ventricule gauche (VG) doit rapidement augmenter l’apport en O2 aux muscles actifs. Le volume d’éjection systolique (VES) et les nombreux paramètres qui le conditionnent doivent aussi rapidement s’adapter malgré une réduction très importante de la durée de diastole. Comment le VG parvient-il à relever ce défi dans les premières minutes de l’exercice et comment ces différents paramètres interagissent ? L’objectif de ce travail de thèse est de répondre à ces questions en combinant l’utilisation des dernières avancées de l’échocardiographie en mode « Speckle Tracking » (STE), permettant d’apprécier finement la fonction myocardique régionale grâce à l’évaluation de la mécanique du VG, avec une approche originale caractérisée par des enregistrements à intervalles réguliers proches au cours de répétitions d’épreuves à charges constantes (épreuves dites « rectangulaires »). Une première partie va consister à décrire finement les cinétiques cardiaques chez le sujet jeune actif, alors qu’une deuxième partie s’attachera à évaluer l’impact de l’entraînement aérobie chez des cyclistes de très bon niveau rapportant de nombreuses années de pratique. Les résultats mettent en évidence que la fonction diastolique et ses mécanismes sous-jacents jouent un rôle clé dans l’adaptation du VES à l’exercice. En permettant l’augmentation de la vitesse de remplissage, la pression de remplissage et la relaxation favorisent l’adaptation du VES dans la première minute. L’adaptation de la vitesse de détorsion jusqu’à 120s prolonge l’adaptation de la vitesse de remplissage et permet le maintien du VES au-delà de la première minute. Par ailleurs, nos résultats indiquent que l’entraînement aérobie induit une adaptation du VES plus importante grâce à une amélioration de la vitesse et du débit de remplissage du VG. Ces améliorations sont le résultat d’une adaptation plus rapide et plus importante de la relaxation à la base et d’une adaptation plus importante de la vitesse de détorsion. Ce travail de thèse basé sur l’étude de la mécanique cardiaque à l’exercice d’intensité modérée a permis de montrer le rôle clé de la diastole, et plus particulièrement de la détorsion du VG, dans l’adaptation rapide du VES ainsi que son amélioration chez le sportif aérobie. En perspective, il serait intéressant d’étudier les cinétiques cardiaques à des intensités d’exercice supérieures ou dans des populations qui présentent des intolérances à l'effort. / Initiated by the pioneering works of Nobel laureates Krogh and Hill, the study of cardiorespiratory system adaptation from rest to dynamic exercise represents a major field in exercise physiology. Oxygen uptake (VO2) has to abruptly increase in order to optimize exercise performance and tolerance by minimizing oxygen deficit and intracellular perturbations. During this “cardiodynamic” phase the LV has to abruptly increase oxygen delivery to mitochondria of active muscles. The stroke volume (SV) and its underlying mechanisms have to rapidly increase despite an important reduction of LV diastolic time. How do LV mechanics address this challenge at the onset of exercise and how do these different factors interact? Therefore, the aim of the present thesis is to answer to these questions by combining the use of latest advances in speckle tracking echocardiography (STE), which allow accurate assessment of regional myocardial function by the evaluation of LV mechanics, with an original approach based on the repetition of five similar constant work-load exercises, each of them being used to record different parameters. The first part give an accurate description of LV kinetics in young healthy active males whereas the second part focus on the evaluation of endurance training effect in well-trained cyclists. Our result highlight the key role of diastolic function and its underlying mechanisms in SV adaptation to exercise. In the first 60s, LV filling pressure and relaxation promote increase of LV filling velocity and hence SV adaptation. Beyond the first 60s, peak untwisting rate continue to increase until 120s allowing for a further increase of LV filling velocity involving SV maintenance. Furthermore, our results indicate that endurance training involve more important adaptation of SV by the improvement of LV filling velocity and filling rate. These improvement are the result of faster and higher adaptation of relaxation at the base and untwisting rate. This thesis based on the assessment of cardiac mechanic at moderate intensity exercise show the key role of diastole and more specifically LV untwist in the fast adaptation of SV and its improvement with endurance training. It would be interesting to study cardiac kinetics in heavy exercise and in pathological population presenting exercise intolerance.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / This work has the main objective of assess the competitiveness of pork meat exports from Brazil and its most important competitors on the international market (Germany, United States, Denmark and Canada), from 1990 to 2012. To this end, the Constant Market Share (CMS) method was used, comprising three effects: world trade; destination; and competitiveness. In order to better capture the changes in exports during the time, five sub periods were chosen, 1990/1993, 1994/1998, 1999/2002, 2003/2008 and 2009/2012. The analysis has demonstrated that United States are the most competitive country during the analyzed period, followed by Brazil. Although United States are more competitive, the growth percentage from Brazil was higher, 4,449.53%, while United States had 2,055.96% of growth. For both countries, ninety percent of this growth occurred due to increasing competitiveness. Denmark was the second country in pork meat exports in 1990, while Brazil and United States were not even among the ten larger exporters. However, Denmark presented the lowest percentage growth and the main reason was the decline of the competitiveness, not showing any positive competitiveness effect in the sub periods. Despite of been less competitive than the United States and Brazil, Germany is by now the largest exporter, with 704.45% of growth. Competitiveness was key to this growth in the complete period, but the increase in the imports of its most important importers was more relevant than in the other analyzed countries. Canada was the only country were most part of the exports growth was due to world trade growth of this product. The country also outstands because of its negative growing tendency at its main trade markets, especially the United States, which has become one of the larger players of world pig farming. / Este trabalho tem como objetivo principal avaliar a competitividade das exportações de carne suína do Brasil e dos maiores competidores no mercado internacional (Alemanha, Estados Unidos, Dinamarca e Canadá), no período de 1990 a 2012. Para isso, utiliza-se como método o Constant Market Share (CMS), decomposto em três efeitos: comércio mundial; destino; e competitividade. Para captar melhor as mudanças nas exportações ao longo do tempo, foram definidos cinco subperíodos, 1990/1993, 1994/1998, 1999/2002, 2003/2008 e 2009/2012. A análise demonstrou que os Estados Unidos são o país mais competitivo no período analisado, seguido pelo Brasil. Apesar dos Estados Unidos serem mais competitivos, o crescimento percentual do Brasil foi maior, 4.449,53%, enquanto o dos Estados Unidos foi de 2.055,96%. Para ambos os países, mais de noventa por cento desse crescimento ocorreu devido ao aumento da competitividade. A Dinamarca era o segundo país que mais exportava carne suína em 1990, enquanto o Brasil e os Estados Unidos sequer estavam entre os dez maiores. No entanto, a Dinamarca apresentou o menor crescimento percentual e o principal motivo foi a queda da competitividade, não apresentando nenhum subperíodo com efeito competitividade positivo. Apesar de se mostrar menos competitiva que os Estados Unidos e o Brasil, a Alemanha é o atual maior exportador, com crescimento de 704,45%. A competitividade foi fundamental para esse crescimento no período todo, mas o aumento nas importações em seus principais mercados se mostrou mais relevante que nos outros países analisados. O Canadá foi o único país onde a maior parte do crescimento ocorreu devido ao crescimento do comércio mundial desse produto. O país se destaca também pela tendência negativa de crescimento nos seus principais mercados compradores, especialmente os Estados Unidos, por este ter se tornado um dos maiores players da suinocultura mundial.

High dielectric constant materials are of technological importance as they lead to the miniaturization of the electronic devices. For instance, in the case of memory devices based on capacitive components, such as static and dynamic random access memories, the dielectric constant will ultimately decide the level of miniaturization. In this context, the observation of anomalously high dielectric constant (>10) in the double perovskite Sr2SbMnO6 (SSM) over wide frequency (100 Hz1 MHz) and (190373 K) temperature range has attracted a great deal of attention. However, unfortunately their dielectric losses were also high which limit their use for possible capacitor and related applications. The dielectric loss however was known to decrease with decreasing crystallite size in electroceramics. Therefore, the present work has been focused on the synthesis of nanocrystalline SSM powders by moltensalt route. The characterization of the ceramics fabricated from these powders for their microstructural and dielectric properties. A cubic phase of SSM powder was obtained by calcining the as synthesized powders at 900°C/10h by using sulphate flux. The crystallite size was ~ 60 nm. The activation energy associated with the particle growth was found to be 95 ± 5 kJmol-1 . The ceramic sintered at 1075°C/16h exhibited high dielectric constant (>10at 1 kHz) with low loss (0.72 at 1 kHz) at room temperature. The results are interpreted in terms of a twolayer model with conducting grains partitioned from each other by poorly conducting grain boundaries. Using this model, we attributed the two electrical responses in impedance and modulus formalisms to the grain and grain boundary effects, respectively, while the detected Debyelike relaxation and large dielectric constant were explained in terms of MaxwellWagner relaxation.