1,130 research outputs found
A sinfonia do sagrado em Castro Alves: (Deus, Eros e mãe em Os escravos)
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão. Programa de Pós-Graduação em Literatura.No presente trabalho realiza-se uma leitura intertextual entre a Bíblia e Os escravos, coletânea de poemas de teor abolicionista do poeta romântico Antônio Frederico de Castro Alves (1847-1871), objetivando demonstrar que os textos poéticos arquitetam-se na desconstrução e reconstrução dos textos bíblicos. A leitura dos poemas centra-se nos personagens: Deus, Eros e Mãe, os quais conformam uma trindade poética/sagrada. A pesquisa divide-se em três movimentos: Prelúdios do sagrado no Romantismo, Tríade melódica e À guisa de coda: trindade poética. No primeiro efetuam-se algumas aproximações ao conceito do sagrado e aos Romantismos francês e brasileiro. O seguinte corresponde à leitura das composições, através das linhas melódicas: A dualidade de Deus, A ambivalência de Eros e O duplo calvário da Mãe escrava. E no último movimento amalgamam-se as inter-relações entre a trindade cristã e poética e os dramas bíblico e poético
Computational methods for 2D materials modelling
No full textMaterials with thickness ranging from a few nanometers to a single atomic layer present unprecedented opportunities to investigate new phases of matter constrained to the two-dimensional plane. Particle-particle Coulomb interaction is dramatically affected and shaped by the dimensionality reduction, driving well-established solid state theoretical approaches to their limit of applicability. Methodological developments in theoretical modelling and computational algorithms, in close interaction with experiments, led to the discovery of the extraordinary properties of two-dimensional materials, such as high carrier mobility, Dirac cone dispersion and bright exciton luminescence, and inspired new device design paradigms. This review aims to describe the computational techniques used to simulate and predict the optical, electronic and mechanical properties of two-dimensional materials, and to interpret experimental observations. In particular, we discuss in detail the particular challenges arising in the simulation of two-dimensional constrained fermions and quasiparticles, and we offer our perspective on the future directions in this field
Representing Roomates' Preferences with Symmetric Utilities
No full textIn the context of the stable roommates problem, it is shown that acyclicity of preferences is equivalent to the existence of symmetric utility functions, i.e. the utility of agent i when matched with j is the same as j 's utility when matched with i .
Bosonization and the many-body problem
No full textIn this thesis the method of bosonization of fermionic many-body systems in any number of dimensions is developed. After an introduction to the problem in chapter 1 and to the method of bosonization in chapter 2 (with its application to the non-interacting problem) the Fermi liquid behavior of interacting fermions in dimensions higher than one is discussed in chapter 3. In chapter 4 I rederive the well-known bosonization of the Tomonaga-Luttinger model in one dimension within the framework discussed in the preceding chapters. In chapter 5 I present the bosonization of elementary excitations of exactly solvable one dimensional systems with special emphasis on the Hubbard chain. Chapter 6 contains the conclusions.Made available in DSpace on 2011-05-07T13:04:33Z (GMT). No. of bitstreams: 2
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Vestígios do ser: uma análise comparativa entre Água Viva e Pedra do Sono
No full textDissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Comunicação e Expressão, Programa de Pós-Graduação em Literatura, Florianópolis, 2010Este trabalho apresenta uma leitura comparativa entre o romance Água viva, de Clarice Lispector, com alguns poemas de Pedra do sono, de João Cabral de Melo Neto, sob a perspectiva da existência pensada por alguns leitores de Martín Heidegger. Com base em Água viva e Pedra do sono, refletimos a problemática do Ser (Dasein), abordada pelo filósofo e repensada pelos escritores literários. Pensamos a existência do Dasein, a partir do que restou do Ser, presente nos textos literários, e na maneira como o "Ser" se dá entre os seres nas obras citadas. Portanto, lemos esses textos, amparando-nos na abordagem do Ser feita por Heidegger, e toda a discussão apresentada pelo filósofo e leitores de sua teoria, para compreender a escrita de Clarice Lispector e de João Cabral de Melo Neto. Convém lembrar que os textos literários desses autores não obedecem às leis do gênero a que remetem, e foram escritos em um período em que ocorreram profundas transformações na sociedade, por isso, são carregados de marcas históricas sociais. Buscamos, por intermédio desses textos literários, compreender a relação entre eles e a modernidade. Lispector e Cabral, dois autores distintos em bibliografia, inauguram linguagens: ele, um artesão da palavra e ela, uma autora que trabalha as possibilidades da linguagem, e dessa forma, aproximam-nos das coisas e do mundo. Em virtude disso, buscamos analisar as obras, a fim de, posteriormente, compará-las entre si, e com a teoria, levando em consideração o contexto e a história. Percebemos deste modo que Lispector e Cabral empregam as palavras não com o seu sentido original, mas tentam dar a essas palavras um sentido diferente, recriado imagens que nos levam a vivenciar outras sensações, estimuladas por essa linguagem com que nos deparamos
Optimal Monetary Rules: The Case of Brazil
No full textWithin a dynamic programming approach we derive an optimal rule for the central bank to attain it's inflation targeting goals. The short-run nominal interest rate is used as an instrument to achieve monetary objectives. The model is tested for the Brazilian economy and compared with results found for other countries. Evidence for the estimated feedback interest rule for the Central Bank suggests that the cost of reducing inflation in an open economy is lower than that of a closed economy.
Macroeconomic Coordination and Inflation Targeting in a Two-Country Model
No full textThis paper deals with a macroeconomic coordination and its stabilization within a new Keynesian framework. The dynamic treatment of a twocountry model is made by simulation, using the linear quadratic algorithm. We compare the optimal monetary policy rule for three types of equilibria: macroeconomic coordination, Nash and Stackelberg, using parameters that reflect the relative size and degree of openness of the economies. Under the strict inflation target, we obtain higher output and inflation volatilities due to each economy's reaction to the other country's policy. The only exception is the case of optimal macroeconomic coordination rules. This dynamic model finds that macroeconomic coordination policy is better than non-coordination rules, supporting the traditional result found in static models.
Monetary Policy Surprises and the Brazilian Term Structure of Interest Rates
No full textThis paper examines the information content of COPOM decisions to change or to leave unchanged monetary policy by estimating the responses of the term structure to changes in the target for interest rates on COPOM meeting days. Within an event-study approach the evidence suggests that market participants anticipate, at least partially, monetary policy actions. Furthermore, it is found that the introduction of the floating exchange and inflation-targeting regime has had a dampening effect on interest rate surprises along the term structure.
Credit Channel with Sovereign Credit Risk: an Empirical Test
No full textAccording to Bernanke and Gertler (1995), the Credit Channel amplifies the traditional monetary transmission and this amplification effect comes through the firm's external finance premium, which is a wedge between the expected return for the funds generated internally and the costs of funds raised externally to the firm. Traditionally, this wedge is the bank loan spread but we extend this concept to include the sovereign (country) credit risk and name it, Extended Credit Channel. Armed with this new concept and using a set up model, we estimate two econometric equations for the Brazilian economy after its inflation stabilization program . These two econometric equations measure: (1) the effects of the pure money channel (real interest rates and compulsory reserve requirements on demand deposits) and the extended credit channel (country credit risk and bank loan spread) on the economy's production, and (2) the impacts of the real interest rates, compulsory reserve requirements on demand deposits, and country credit risk on the bank loan spread. Both equations coefficients signs conform to the expected theoretical model. With the results of the estimated equation (1), we define a Product Loss Index Number to compare these two transmission channels (extended credit and pure monetary). This comparison shows that the extended credit channel is a relevant as the pure monetary channel.
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