Propostas e discussões para o ensino de astronomia nos 1º e 2º ciclos do nível fundamental e na educação de jovens e adultos

This work aims to propose and to discuss methodologies and practical activities for Astronomy teaching in the 1st and 2nd cycles of the primary education and in the adult education. The proposals presented here were applied to students from the metropolitan region of Natal (RN), including students of the called normal education (formerly magisterial education) and of the undergraduate formation in pedagogy at the Instituto de Formação Superior Presidente Kennedy , and also, in particular, to teachers and students of public municipal school Escola Municipal Djalma Maranhão at the district of Felipe Maranhão II, also analyzing some didactic books used by these institutions. Several elements which we confronted with during this didactic-pedagogical experience were systematized, indicating principles, contents, reflections and procedures related to Astronomy teaching to students of those levels of education. Doing this we aim to make such an experience accessible to those interested in developing a similar approach involving the themes treated here as well as other ones related to Astronomy for those levels of education. The resources and practices implemented here aim to contribute to the effective realization of an interdisciplinary and contextualized education according to orientations proposed by the Parâmetros Curriculares Nacionais (Brazilian National Curricular Guidelines). In order to guarantee a broad accessibility to what we propose in this work, we intend to make available in printed form and also in an Internet page the procedures, instruction materials and texts we developed

Conceitos e técnicas da mecânica estatística e termodinâmica aplicados ao estudo dos grafos aleatórios

This dissertation briefly presents the random graphs and the main quantities calculated from them. At the same time, basic thermodynamics quantities such as energy and temperature are associated with some of their characteristics. Approaches commonly used in Statistical Mechanics are employed and rules that describe a time evolution for the graphs are proposed in order to study their ergodicity and a possible thermal equilibrium between them

Setor escuro do universo: uma análise termodinâmica

Significant observational effort has been directed to unveiling the nature of the so-called dark energy. However, given the large number of theoretical possibilities, it is possible that this a task cannot be based only on observational data. In this thesis we investigate the dark energy via a thermodynamics approach, i.e., we discuss some thermodynamic properties of this energy component assuming a general time-dependent equation-of-state (EoS) parameter w(a) = w0 + waf(a), where w0 and wa are constants and f(a) may assume different forms. We show that very restrictive bounds can be placed on the w0 - wa space when current observational data are combined with the thermodynamic constraints derived. Moreover, we include a non-zero chemical potential μ and a varying EoS parameter of the type ω(a) = ω0 + F(a), therefore more general, in this thermodynamical description. We derive generalized expressions for the entropy density and chemical potential, noting that the dark energy temperature T and μ evolve in the same way in the course of the cosmic expansion. The positiveness of entropy S is used to impose thermodynamic bounds on the EoS parameter ω(a). In particular, we find that a phantom-like behavior ω(a) < −1 is allowed only when the chemical potential is a negative quantity (μ < 0). Thermodynamically speaking, a complete treatment has been proposed, when we address the interaction between matter and energy dark

Ensino da astronomia no Brasil: educação formal, informal, não formal e divulgação científica

Este artigo deriva de uma pesquisa mais ampla sobre a educação em astronomia e a formação de professores, e apresenta um panorama geral sobre o tema em âmbito nacional. Procuramos gerar uma classificação das instituições e outras iniciativas brasileiras dedicadas à astronomia, levando em conta os seus objetivos, tais como o ensino formal, informal, não-formal, bem como aqueles destinados à popularização dessa ciência. Comenta-se, em forma de um breve ensaio, a importância da atuação contextualizada destas instâncias no ensino da astronomia, levantando um desafio ainda a ser considerado, referente ao estudo das possíveis relações entre estes estabelecimentos e iniciativas, visando o avanço da educação em astronomia, em um movimento contrário à dispersão e pulverização de atividades locais e pontuais dos mesmos. Argumentamos que a pesquisa em ensino de astronomia tem potencial para exercer este papel integrador.

A montagem e a utilização de lunetas de baixo custo como experiência motivadora ao ensino de astronomia

This work reports on an experience of continual development courses for in-service teachers from some high schools of Bauru's (SP) region, for whom a specific workshop on assembling of refractor telescopes has been carried out in order to supplement their knowledge in astronomy. In the current article, the importance of the practice (or "knowing") in the context of their academic formation is discussed as well as some steps on the assembling of low cost refractor telescopes are described. The main results obtained from the participation of these teachers in the proposed activities are also presented.

Quilombolas e desenvolvimento sustentável: análise a partir da comunidade Capoeira dos Negros (Macaíba/RN)

Quilombo communities remaining are groups marked by insufficient public assistance and characterized by living in rural and conducting economic activities such as agriculture. The development on a sustainable basis is important to ensure strategies for economic growth and environmental preservation. This work aims to study the remaining Quilombo Capoeira Black community, located in the municipality of Macaíba, Rio Grande do Norte, considering the principles of sustainable development. Attempt to respond to what level such community can be considered sustainable from an analysis of their social practices. The methodological procedures used consisted of a literature review and documentary, questionnaires, conducting semi-structured interviews and direct observation. The final results show that the family farm has characteristics that approximate the principles of sustainable development, including the diversification of labor, food production with less environmental damage and strengthening the rural environment, and indicate that the main economic activities practiced in Capoeira dos Negros community are agriculture, manufacturing of cassava flour and brick manufacturing, which, in turn, are linked to negative environmental impacts, such as sedimentation pond, groundwater contamination, air pollution and soil erosion. What lead to the conclusion that the social practices of the community are not in line with the dimensions of sustainable development. It is hoped that the survey results provide subsidies for development and implementation of public policies

Termodinâmica de um gás de fótons no contexto de eletrodinâmicas não-lineares

The objective of this dissertation is the development of a general formalism to analyze the thermodynamical properties of a photon gas under the context of nonlinear electrodynamics (NLED). To this end it is obtained, through the systematic analysis of Maxwell s electromagnetism (EM) properties, the general dependence of the Lagrangian that describes this kind of theories. From this Lagrangian and in the background of classical field theory, we derive the general dispersion relation that photons must obey in terms of a background field and the NLED properties. It is important to note that, in order to achieve this result, an aproximation has been made in order to allow the separation of the total electromagnetic field into a strong background electromagnetic field and a perturbation. Once the dispersion relation is in hand, the usual Bose-Einstein statistical procedure is followed through which the thermodynamical properties, energy density and pressure relations are obtained. An important result of this work is the fact that equation of state remains identical to the one obtained under EM. Then, two examples are made where the thermodynamic properties are explicitly derived in the context of two NLED, Born-Infelds and a quadratic approximation. The choice of the first one is due to the vast appearance in literature and, the second one, because it is a first order approximation of a large class of NLED. Ultimately, both are chosen because of their simplicity. Finally, the results are compared to EM and interpreted, suggesting possible tests to verify the internal consistency of NLED and motivating further developement into the formalism s quantum case

Os 'troncos velhos' e os 'quilombinhos': memória genealógica, território e afirmação étnica em Boa Vista dos Negros (RN)

Durante a pesquisa visando à elaboração do relatório antropológico de Boa Vista dos Negros, comunidade quilombola do Seridó (RN), verificamos que o grupo conserva uma longa memória genealógica e que, apesar das mudanças ocorridas na organização econômica e social do grupo, as principais formas de solidariedade foram mantidas. Queremos, aqui, refletir sobre a importância da noção de família, a transmissão dos nomes e da memória genealógica na definição do território quilombola. Na ocasião, serão analisados como os elementos da cultura tradicional são ressignificados ao longo do processo de afirmação étnica

Os filhos de Tereza: narrativas e religiosidade na Boa Vista dos Negros/RN

CAVIGNAC, J. A. . Os filhos de Tereza: narrativas e religiosidade na Boa Vista dos Negros/RN. Tomo, São Cristovão, SE, n. 11, p. 77-102, jul./dez. 2007. Disponível em: . Acesso em: 16 mar. 2015.

ANALISE MORFOLOGICA DE 'SPINA MENTALIS' DE MANDIBULAS HUMANAS ADULTAS DE BRASILEIROS BRANCOS E NEGROS

This study was carried out to verify the morphology of the spina mentalis. We observed 275 human adult mandibles of both sexes and ethnic groups. An analysis of the results allows the following conclusions. The spina mentalis exists in 90.04% ±1.8 of the mandibles of Whites and Negroes. The typical form with four tubercles, as described by some authors, is rarely found. In most cases it is characterized by the presence of: two upper tubercles (27.27%±7.2), two superior tubercles and one inferior (24.72%±6.7), and one elongated median tubercle (24.0%±6.6); The forms and volumes of the tubercles are very irregular and seem not to depend on age, sex or ethnic group. The spina was absent in 9.8%±3.2 of the cases, especially in mandibles of White teethless individuals. An hypertrophic spina mentalis, generally formed at the expense of the upper tubercle, was observed in only 1.45%±0.5 of the cases.

Energía solar termodinámica en América Latina: los casos del Brasil, Chile y México

Incluye bibliografía

Pelos olhos do menino de engenho: os personagens negros na obra de José Lins do Rego

Pós-graduação em Ciências Sociais - FFC

Avaliação termodinâmica, termoeconômica e econômica da integração de sistemas de gaseificação da biomassa em uma usina sucroalcooleira

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Análise termodinâmica, termoeconômica e econômica de uma usina sucroalcooleira com processo de extração por difusão

Pós-graduação em Engenharia Mecânica - FEIS

Análise termodinâmica e termoeconômica do aproveitamento do gás natural em sistemas de cogeração de energia de usinas de açúcar e álcool

Pós-graduação em Engenharia Mecânica - FEIS