1,530 research outputs found

    Italian Exile In Iowaland

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    Italian Exile In Iowaland

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    SCOLPIRE GLI EROI

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    Catalogo della mostra che riproponeva i maggiori monumenti risorgimentali italiani attraverso i loro bozzett

    Da poesia na ciencia : fundadores do Instituto Histórico e Geográfico do Paraná, uma história de suas idéias. Curitiba, 1900

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    Orientadora : Ana Maria de O. BurmesterAutor n√£o autorizou a divulga√ß√£o do arquivo digitalDisserta√ßao (mestrado) - Universidade Federal do Paran√°, Setor de Ciencias Humanas, Letras e ArtesInclui refer√™nciasResumo: Este trabalho procurou analisar, do ponto de vista de uma hist√≥ria das id√©ias, o percurso intelectual dos fundadores do Instituto Hist√≥rico e Geogr√°fico do Paran√°, na virada do s√©culo XIX para o XX em Curitiba, para recuperar, em um momento de celebra√ß√£o nacional, propostas de cria√ß√£o de uma identidade paranaense para um Estado com uma hist√≥ria oficial recente. Atrav√©s do conceito de configura√ß√£o, de Norbert Elias, procura recuperar as diferentes rela√ß√Ķes estabelecidas pelos fundadores no seio da sociedade curitibana, procurando apreender o surgimento de uma intelectualidade comprometida com os novos ideais republicanos. Atrav√©s do conceito de l√≠ngua, de S√©rgio Paulo Rouanet, procura pensar a circula√ß√£o de v√°rias correntes de pensamento pr√≥prias da √©poca, atrav√©s do exame dos peri√≥dicos e di√°rios da capital de cuja produ√ß√£o participaram os fundadores. Atrav√©s do conceito de inven√ß√£o das tradi√ß√Ķes, de Eric Hobsbawn, procura explicar a necessidade de se criar uma identidade para o povo paranaense. Por fim, procura mostrar como a interpenetra√ß√£o das v√°rias configura√ß√Ķes surgidas, em especial, na √ļltima d√©cada do s√©culo XIX, possibilitou o surgimento de um discurso que ganharia car√°ter oficial, com a funda√ß√£o do Instituto Hist√≥rico sendo um dos primeiros passos na cria√ß√£o do Movimento Paranista, que viria a dominar o cen√°rio paranaense da I Rep√ļblica

    Influence of chemically synthesized powder addition on K0.5Na0.5NbO3 ceramic's properties

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    A new strategy to produce lead-free K0.5Na0.5NbO3 (KNN) piezoceramics with reliable and improved piezoelectric performance is presented for the first time. KNN powders were synthesized using two distinct synthesis routes: a mechanochemical activation-assisted solid-state route (KNNSSR) and a sol-gel modified Pechini method (KNNchem). KNNchem powders were mixed with KNNSSR at different weight ratios (0, 3, 5, 10 and 20 wt%), and the mixtures were conventionally consolidated and sintered at 1130 degrees C for 2 h. It was found that KNNchem powders influence crystal phase, microstructure and piezoelectric properties of the sintered pellets. Gradually increasing KNNchem content promotes the conversion of the undesired phase present in KNNSSR into the stoichiometric one. It is also proved that the addition of KNNchem between 5 and 10 wt% improves piezoelectric properties, eventually leading to a d(33) piezoelectric charge constant value of 113-115 pC/N. These values are among the highest reported for undoped KNN ceramics obtained by conventional sintering

    Perturbation Theory for Metastable States of the Dirac Equation with Quadratic Vector Interaction

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    The spectral problem of the Dirac equation in an external quadratic vector potential is considered using the methods of the perturbation theory. The problem is singular and the perturbation series is asymptotic, so that the methods for dealing with divergent series must be used. Among these, the Distributional Borel Sum appears to be the most well suited tool to give answers and to describe the spectral properties of the system. A detailed investigation is made in one and in three space dimensions with a central potential. We present numerical results for the Dirac equation in one space dimension: these are obtained by determining the perturbation expansion and using the Pad\'e approximants for calculating the distributional Borel transform. A complete agreement is found with previous non-perturbative results obtained by the numerical solution of the singular boundary value problem and the determination of the density of the states from the continuous spectrum.Comment: 10 pages, 1 figur
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