Um estudo sobre teorias de dimensões extras: modelos de branas geradas por campos escalares

In this work we study extra dimensional theories, taking emphasis in braneworld models generated by real scalar fields. Firstly, we revise the Randall-Sundrum models and we discuss about some thick braneworld scenarios already considered in the literature. We introduce a new thick brane model in order to address the Standard Model hierarchy problem. Furthermore, we show that there exists a class of scalar fields models which are very interesting for analytical studies of thick brane scenarios. Finally, we analyze the braneworld consistency conditions in the context of f(R) and Brans-Dicke gravities, where we show that it is possible to evade a no-go theorem regarding thick brane scenarios

Teorias de Spin-1: decomposição em helicidades, redução dimensional e imersão de calibre

We have studied the physical content of the following models: Maxwell, Proca, Self-Dual and Maxwell-Chern-Simons. One method we have used is the decomposition in the so called helicity variables, which can be done in the Lagrangian formalism. It leads to the correct counting of degrees of freedom without choosing a gauge condition. The method separates the propagating modes from the non-propagating ones. The Hamiltonian of the MCS and the AD is calculated. The second method used here is the analysis of the sign of the imaginary part of the residues of the two-point amplitude of the theory, showing that the models analyzed are free of ghosts. We also carry the dimensional reduction of the Maxwell-Chern-Simons and Self-Dual models from D = 2+1 to D = 1 + 1 dimensions. Next, we show that the dimensional reduction of those equivalent models also leads to equivalent models in D=1+1. Even more interesting is the fact, demonstrated here, that those reduced models can also be connected via gauge embedding. So the gauge embedding of the Self-Dual model into the Maxwell-Chern-Simons theory is preserved by the dimensional reduction

A construção da novidade: diálogos (im)pertinentes entre as teorias de Jean Piaget e Paulo Freire

Pós-graduação em Psicologia - FCLAS

A importância do mercado de capitais: considerações das teorias econômica e financeira

This paper attempts to analyze and highlight the importance of the capital market for growth and economic development of the country, sustainable business growth and growth of the assets of an individual, as an alternative investment and financing. Were also examined the barriers to further growth of this market and relevant criticism about this. The study is guided from analyzes of economic and financial theories, concepts and fundamental principles for understanding the functioning of financial markets, even more specific, empirical analysis of the efficiency of markets and the stock market, in the context of Brazilian reality

Teorias democráticas diante da nova gramática de organização da sociedade e da relação entre o Estado e a sociedade

This article is about the democratic theoretical conceptions reformulated in face of the new social rules in which actors showed up claiming repressed social repressed from the second half of the XX century. In this article an approach of the main contributions of the dimensions of the conception of democracy. As a result, we present that the institutional innovations that came from a process of institutionalism of democracy have built a participative and inclusive ideal of social groups that so far were apart from the decision process in politics.

Teorias dos sistemas, cultura e espaços rurais de reforma agrária

Fundamentals of Theoretical Ecology and the principles governing ecosystems are discussed in relation to the anthropological concept of culture. These principles have been formed along with the development of Ecology and the advancement of other sciences not necessarily biologically based, such as Mathematics and Physics. A deeper understanding of Ecology in interdisciplinary projects is important because it is both a holistic Science, encompassing several disciplines of the field of knowledge, as a Science, whose principles can be applied to any other science. Its origin and evolution differ from modern sciences that emerged from Renaissance, because, taking place at the turn of the nineteenth to the twentieth century, developing itself along with the theories of systemic thinking at the beginning of this century, Ecology inspired this new thinking, culminating with the emergence of General Systems Theory in search of a "transdisciplinar" unification proposed by today's New Science. By applying the System Theory to the analysis of the behaviors of the individual and of the group, it is possible to approach the Agrarian Reform in a more comprehensive way.

Significação e sentimentos dos alunos quando erram na matemática

A afetividade presente nas situações em que o erro ocorre na escola tem promovido significações negativas dos alunos em seu processo de aprendizagem. Embasada na teoria de Piaget, a presente pesquisa analisou o papel da afetividade nas significações sobre o erro de 15 alunos do 6º ano do Ensino Fundamental que frequentam uma sala de apoio por apresentarem dificuldades, sobretudo, na disciplina de matemática. A pesquisa caracterizou-se como qualitativa, e foi aplicada com base no método clínico crítico piagetiano. O plano para a coleta de dados foi distribuído em duas etapas: E1 - Observação das interações na sala de apoio; E2 - Realização de entrevista semiestruturada para identificação das significações dos alunos. Como resultado, obteve-se: de modo geral, os alunos relacionam o erro a situações de não respeito às regras e, especialmente, de desobediência ao professor. Nas significações referidas ao erro com a presença do professor, prevalecem sentimentos como a culpa e o desânimo; com relação aos colegas, não há muita diferença, já que o erro está relacionado a sentimentos como a culpa, raiva e desânimo. Com relação ao processo de aprendizagem, os alunos compreendem o erro como ação fora deste processo, demonstrando, em tais situações, pouco interesse, esforço e implicação.

Cognição e conceptualização do tempo: o processo da significação do tempo linguístico de alguns enunciados em língua portuguesa

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Desenvolvimento do sistema do capital e teorias de transição em Trotski e Mészáros

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)