Teorias f(R) de gravidade na formulação de Palatini

In this dissertation, after a brief review on the Einstein s General Relativity Theory and its application to the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological models, we present and discuss the alternative theories of gravity dubbed f(R) gravity. These theories come about when one substitute in the Einstein-Hilbert action the Ricci curvature R by some well behaved nonlinear function f(R). They provide an alternative way to explain the current cosmic acceleration with no need of invoking neither a dark energy component, nor the existence of extra spatial dimensions. In dealing with f(R) gravity, two different variational approaches may be followed, namely the metric and the Palatini formalisms, which lead to very different equations of motion. We briefly describe the metric formalism and then concentrate on the Palatini variational approach to the gravity action. We make a systematic and detailed derivation of the field equations for Palatini f(R) gravity, which generalize the Einsteins equations of General Relativity, and obtain also the generalized Friedmann equations, which can be used for cosmological tests. As an example, using recent compilations of type Ia Supernovae observations, we show how the f(R) = R − fi/Rn class of gravity theories explain the recent observed acceleration of the universe by placing reasonable constraints on the free parameters fi and n. We also examine the question as to whether Palatini f(R) gravity theories permit space-times in which causality, a fundamental issue in any physical theory [22], is violated. As is well known, in General Relativity there are solutions to the viii field equations that have causal anomalies in the form of closed time-like curves, the renowned Gödel model being the best known example of such a solution. Here we show that every perfect-fluid Gödel-type solution of Palatini f(R) gravity with density and pressure p that satisfy the weak energy condition + p 0 is necessarily isometric to the Gödel geometry, demonstrating, therefore, that these theories present causal anomalies in the form of closed time-like curves. This result extends a theorem on Gödel-type models to the framework of Palatini f(R) gravity theory. We derive an expression for a critical radius rc (beyond which causality is violated) for an arbitrary Palatini f(R) theory. The expression makes apparent that the violation of causality depends on the form of f(R) and on the matter content components. We concretely examine the Gödel-type perfect-fluid solutions in the f(R) = R−fi/Rn class of Palatini gravity theories, and show that for positive matter density and for fi and n in the range permitted by the observations, these theories do not admit the Gödel geometry as a perfect-fluid solution of its field equations. In this sense, f(R) gravity theory remedies the causal pathology in the form of closed timelike curves which is allowed in General Relativity. We also examine the violation of causality of Gödel-type by considering a single scalar field as the matter content. For this source, we show that Palatini f(R) gravity gives rise to a unique Gödeltype solution with no violation of causality. Finally, we show that by combining a perfect fluid plus a scalar field as sources of Gödel-type geometries, we obtain both solutions in the form of closed time-like curves, as well as solutions with no violation of causality

A geografia no currículo do ensino médio e no vestibular da UFRN: 2001-2007

This work examines the results of the selecting process to enter Universidade Federal do Rio Grande do Norte called Vestibular, in 2001, 2003, 2005 and 2007, in relation to the necessary knowledge presented by the candidates in the Geography area. It observes the contents in the discursive exams and its corresponding results discussing them from the official curriculum of the Secondary School, as it is stated in the official documents of Ministério da Educação(MEC): Parâmetros Curriculares Nacionais do Ensino Médio (PCNEM), Orientações Curriculares Nacionais para o Ensino Médio (OCNEM) e Orientações Educacionais Complementares aos Parâmetros Curriculares Nacionais (PCN+ do Ensino Médio). We aim to highlight what are the contents and background of the Geography curriculum according to the orientations of the official curriculum; discuss in what measure these contents are present in the questions and in the correct answers of the candidates as well as reflect upon what possibly is suggested by those results concerning the knowledge presented in the answers. In this investigation process, the history of the teaching in Brazil is taken up together with the statistical data about the Fundamental School and about Higher Education in the last years. Both map the scenario in which this research takes place as well as make knowledgeable some variables such as: cultural, economical, political and social structures. The discussion takes place between the curriculum and the teaching, Geography teaching and Secondary School in Brazil articulating these variables with the question of accessibility to Higher Education through the Vestibular . Despite the limitations of this research in terms of methodology and deepening of analysis, the results led us to important observations which can contribute to the understanding of that the students´ performance in the Geography examination has several outspreads. These must be thought with scientific exactness in order to avoid any rushed and careless explanations leading to conclusions that may have serious consequences for the teaching systems and the students

Desindustrialização no Brasil: teorias e evidências para o debate

This study aims to contribute with evidence to reinforce or not the thesis of a possible deindustrialization of the Brazilian economy, with emphasis on period after 1995. The debate began in the late 80s, however, recently the industry deceleration gained strength in discussions academic. Between the main theses in this debate is the new-development that believes in precocious deindustrialization caused primarily by overvaluation exchange rate. However, part of heterodoxy believes the industry downturn is more related to the rate of investment than the exchange rate. Nevertheless, according to the orthodox thesis the loss of competitiveness due to the high cost of production may have caused the de-industrialization in Brazil. On the other hand, part of Orthodoxy does not believe that the country is deindustrializing it, but is occurring convergence of Brazilian industry the world average. Thus, in an attempt to shed light on this debate, this study intends to identify the reasons for the deceleration of the Brazilian industry, emphasizing aspects underexplored in the literature and define whether or not the country suffers a process of deindustrialization. When analyzing various indicators, especially the quantum level we find strong indications that the deceleration of the Brazilian industry can be characterized as a deindustrialization, though still insufficient to qualify as precocious, given the loss of share in physical production in total output and the share of primary goods in the export basket

Identidades coletivas de estudiosos da linguagem no currículo lattes: docência, pertença social e capital cultural-acadêmico

The discussion involving the identity of social actors has taken place for some years, however, it has become significant for the discourse studies over the last years due to the fragmentation of postmodern actors. Understanding the identity as a symbolic concept that can aid in the detection of certain realities - a kind of mechanism / a magnifying glass (MERLUCCI, 1985) - you can check the linguistic materiality of the introductory text of the lattes resume as a adequate place for the formation of collective identities . The aim of this dissertation is to reflect, in a time of postmodernity, through the lattes introductory curriculum texts, the collective identities of the language researchers are portrayed in discursive and social practices based on the accumulation of cultural and academic capital. For analysis, surrounding the indisciplinary posture in Applied Linguistics (MOITA-LOPES, 2006), the descriptive / interpretive methodology was used (MAGALHÃES, 2001). Whereas the study method and the social theory, as state reasons of the research makes use of the Sociological Approach and Communicational Discourse, chain linked to the assumptions of Critical Discourse Analysis (PEDROSA, 2012a). The corpus is constituted of twenty-seven introductory texts from the lattes curriculum of language researchers, connected to three institutions of higher learning in Sergipe. After the collection, on the lattes platform, and the numbering of the curriculum in order to achieve the research objective, we performed the analysis based on three identity themes: teaching, social belonging (BAJOIT, 2006; DESCHAMPS; MOLINER, 2009) and the accumulation of academic-cultural capital (BOURDIEU, 2004; HEY, 2008). The data show that the texts of the lattes curriculum are based on hegemonic and ideological principals, referring to the accumulation of academic assets, the valuation of actors and the hierarchical positions, recognized and ratified by couples who socialize among themselves Right now, the research allows us to infer that, in postmodernity, some collective identity assumptions, contribute to the understanding of the academic reality, around the the lattes curriculum.

Saberes e perspectivas dos docentes em torno do currículo de uma escola pública rural do RN

Este trabajo tiene como objetivo analizar los saberes y las perspectivas docentes en torno al currículum de una escuela pública rural de Enseñanza Fundamental del Río Grande do Norte considerando, sobre todo, los debates sobre la Educación en el Campo en Souza (2006, 2007), Arroyo, Caldart y Molina (2004) y Fernandes (2002, 2004). La propuesta surge como alternativa para la elaboración de proposiciones curriculares para mejorar la calidad de la enseñanza en esas escuelas, según las características específicas de la educación escolar en contexto rural, en la expectativa de que esta sea un elemento para el desarrollo local y global de las comunidades rurales. La fundamentación teórica para responder a la investigación, se respalda en las consideraciones sobre los saberes docentes teniendo en cuenta las lecturas de Gauthier (1998), Tardif (2011), Pimenta (2009), Paulo Freire (1996), Nóvoa (2007, 2008) y las referencias sobre el currículum crítico y postcrítico discutidas en Giroux (1997), Silva (1999), Moreira (2008), Moreira y Candau (2003, 2010), Sacristán (2000) e Sacristán e Gómez (1998). La referencia empírica se constituye de una escuela pública de una comunidad rural en el municipio de São José de Mipibu-RN. Los sujetos sociales de la investigación son cuatro profesores(as) que trabajan en los años iniciales de la Enseñanza Fundamental. Se recurrió a la investigación etnográfica fundamentada en los estudios de Lüdke y André (1986), Sandín Estebán (2010) y Gil (2007), una vez que el análisis del cotidiano escolar, bajo el mirar etnográfico, a través de los procedimientos de la observación participante y de la entrevista semiestructurada, permite el contacto directo del investigador con el ambiente en estudio, registra el no documentado, y percibe la institución escolar como espacio cultural, caracterizando varios grados de acomodación, contestación y resistencia inmersos en una pluralidad de lenguajes y objetivos conflictivos. Las observaciones hechas en la clase y las enseñanzas de los profesores y profesoras permiten comprender que los saberes y perspectivas docentes, a partir de las experiencias del profesorado, lanzan expectativas socioprofesionales sobre la docencia e intensifican el papel fundamental del docente en la construcción de los saberes, de las prácticas y concepciones del mundo rural, de la escuela rural y de la función social de esta. Los hallazgos de la investigación con los profesores sobre el contexto rural apuntan para la necesidad en problematizar verdades socialmente construidas, bajo la orientación de una racionalidad que reconozca el espacio rural como productor de la existencia. A partir de los análisis construidos, se pudo reconocer la necesidad de una política de formación conceptual específica para el profesorado de las escuelas rurales, anclada en el concepto históricocultural del rural. También se reitera la urgencia permanente y continuada en revisar los procesos de formación, vividos en la escuela, que contemplen las peculiaridades de la enseñanza rural, en una visión contrahegemónica del urbanocentrismo, a partir de un análisis crítico sobre el marco legal de la Educación del Campo.

Currículo escolar e inclusão de estudantes com deficiência: diálogos com uma escola pública

This work of qualitative approach, has as its study object the school curriculum, resulting from the implementation of public policies for inclusion in the Brazilian educational field and of the teaching organization in State School Despertar. While we acknowledge advances in government discussions and proposals related to school inclusion in our country, it is still important to develop studies and interventions in the context of basic education focused on the curriculum. With methodological basis in collaborative-critical action research and contribution by Barbier, the survey was conducted in 2013, in a state school in the Natal - Rio Grande do Norte - school system, and aimed to analyze the curriculum of the State School Despertar, in particular issues related to the inclusion of students with disabilities in common teaching classes expressed in the school and in collective situations of continuing education with teachers and interpreter of Brazilian Sign Language (Libras). The school was previously chosen because it had already been locus of research in a study conducted by a professor at the Federal University of Rio Grande do Norte promoting the knowledge of their formative needs. The study subjects were 26 teachers in the early years and the end of elementary school and a Libras interpreter. The instruments were direct observation, semi-structured interviews, document analysis and a proposal for continuing education called Collaborative Group on School Inclusion (GCEI), established with the participating subjects and the other research collaborators. The analyzed data showed eight dialogues built with the State School Despertar, being basic the contributions of Goffman (1988) on stigma and of Forquin (1993) on school culture. As a theoretical framework, there were important contributions on School Curriculum (SACRISTÁN, 2000; 2007; APPLE, 2006; 2008), School Inclusion (BUENO, 2008), Continuing Education (NÓVOA, 2002; GATTI, 2003) and the existing studies on the dialogues between Curriculum and Special Education (MAGALHÃES, 2002; SILVA, 2008; 2010; OLIVEIRA, 2004; VIEIRA, 2012). The study highlighted the importance of extending the dialogue, the theoretical deepening of GCEI for the understanding of school curriculum and the specifics of any students, with or without disability. It will be necessary to revisit the school teaching practices that do not correspond to the students, for instance the formation of classes made in classrooms. It is also important to consider the organization of the school day and its interface with the pedagogical functions of each member of the school in building curriculum practices consistent with the diversity of modes and learning styles. Subliminal aspects of the curriculum should be reviewed, given its implications in the context of the classroom and management. However, significant changes identified in the practices of some teachers, such as the use of audio description, stimulus to the participation of students with disabilities and use of images, favored the development of other students, who benefit of more exciting and participatory classes. Based on the conducted research, we conclude on the importance of collectively discuss the conditions for / in schooling of different students and the (re)thinking of curriculum practices in the school as a whole, and therein lies a paradox because, on the one hand, it is not about minimizing the specific knowledge in dealing with the needs of students with disabilities, on the other, we are not interested in distancing these needs from those inherent in human nature, therefore peculiar to the other students. The questioning of our own practices is the challenge imposed, not to special education, or its target audience, but this is undoubtedly task of education.

Currículo escolar e inclusão de estudantes com deficiência: diálogos com uma escola pública

This work of qualitative approach, has as its study object the school curriculum, resulting from the implementation of public policies for inclusion in the Brazilian educational field and of the teaching organization in State School Despertar. While we acknowledge advances in government discussions and proposals related to school inclusion in our country, it is still important to develop studies and interventions in the context of basic education focused on the curriculum. With methodological basis in collaborative-critical action research and contribution by Barbier, the survey was conducted in 2013, in a state school in the Natal - Rio Grande do Norte - school system, and aimed to analyze the curriculum of the State School Despertar, in particular issues related to the inclusion of students with disabilities in common teaching classes expressed in the school and in collective situations of continuing education with teachers and interpreter of Brazilian Sign Language (Libras). The school was previously chosen because it had already been locus of research in a study conducted by a professor at the Federal University of Rio Grande do Norte promoting the knowledge of their formative needs. The study subjects were 26 teachers in the early years and the end of elementary school and a Libras interpreter. The instruments were direct observation, semi-structured interviews, document analysis and a proposal for continuing education called Collaborative Group on School Inclusion (GCEI), established with the participating subjects and the other research collaborators. The analyzed data showed eight dialogues built with the State School Despertar, being basic the contributions of Goffman (1988) on stigma and of Forquin (1993) on school culture. As a theoretical framework, there were important contributions on School Curriculum (SACRISTÁN, 2000; 2007; APPLE, 2006; 2008), School Inclusion (BUENO, 2008), Continuing Education (NÓVOA, 2002; GATTI, 2003) and the existing studies on the dialogues between Curriculum and Special Education (MAGALHÃES, 2002; SILVA, 2008; 2010; OLIVEIRA, 2004; VIEIRA, 2012). The study highlighted the importance of extending the dialogue, the theoretical deepening of GCEI for the understanding of school curriculum and the specifics of any students, with or without disability. It will be necessary to revisit the school teaching practices that do not correspond to the students, for instance the formation of classes made in classrooms. It is also important to consider the organization of the school day and its interface with the pedagogical functions of each member of the school in building curriculum practices consistent with the diversity of modes and learning styles. Subliminal aspects of the curriculum should be reviewed, given its implications in the context of the classroom and management. However, significant changes identified in the practices of some teachers, such as the use of audio description, stimulus to the participation of students with disabilities and use of images, favored the development of other students, who benefit of more exciting and participatory classes. Based on the conducted research, we conclude on the importance of collectively discuss the conditions for / in schooling of different students and the (re)thinking of curriculum practices in the school as a whole, and therein lies a paradox because, on the one hand, it is not about minimizing the specific knowledge in dealing with the needs of students with disabilities, on the other, we are not interested in distancing these needs from those inherent in human nature, therefore peculiar to the other students. The questioning of our own practices is the challenge imposed, not to special education, or its target audience, but this is undoubtedly task of education.