Acelaração do universo e criação gravitacional de matéria escura fria: novos modelos e testes observacionais

Recent astronomical observations (involving supernovae type Ia, cosmic background radiation anisotropy and galaxy clusters probes) have provided strong evidence that the observed universe is described by an accelerating, flat model whose space-time properties can be represented by the FriedmannRobertsonWalker (FRW) metric. However, the nature of the substance or mechanism behind the current cosmic acceleration remains unknown and its determination constitutes a challenging problem for modern cosmology. In the general relativistic description, an accelerat ing regime is usually obtained by assuming the existence of an exotic energy component endowed with negative pressure, called dark energy, which is usually represented by a cosmological constant ¤ associated to the vacuum energy density. All observational data available so far are in good agreement with the concordance cosmic ¤CDM model. Nevertheless, such models are plagued with several problems thereby inspiring many authors to propose alternative candidates in the relativistic context. In this thesis, a new kind of accelerating flat model with no dark energy and fully dominated by cold dark matter (CDM) is proposed. The number of CDM particles is not conserved and the present accelerating stage is a consequence of the negative pressure describing the irreversible process of gravitational particle creation. In order to have a transition from a decelerating to an accelerating regime at low redshifts, the matter creation rate proposed here depends on 2 parameters (y and ߯): the first one identifies a constant term of the order of H0 and the second one describes a time variation proportional to he Hubble parameter H(t). In this scenario, H0 does not need to be small in order to solve the age problem and the transition happens even if there is no matter creation during the radiation and part of the matter dominated phase (when the ß term is negligible). Like in flat ACDM scenarios, the dimming of distant type Ia supernovae can be fitted with just one free parameter, and the coincidence problem plaguing the models driven by the cosmological constant. ACDM is absent. The limits endowed with with the existence of the quasar APM 08279+5255, located at z = 3:91 and with an estimated ages between 2 and 3 Gyr are also investigated. In the simplest case (ß = 0), the model is compatible with the existence of the quasar for y > 0:56 whether the age of the quasar is 2.0 Gyr. For 3 Gyr the limit derived is y > 0:72. New limits for the formation redshift of the quasar are also established

Relações interétnicas em conflito entre makuxi e wapixana na terra indígena Raposa Serra do Sol

This dissertation present an analysis of the interethnic conflict between Makuxi and Wapixana at the current moment in the Maloca of the Adobe, Aboriginal Land Fox-Mountain range of the Sun, in the State of Roraima. The theoretical field was boarded in the Ethnology, pursuing situations in local history, with edges in ethno-history. The research elapsed of the deepening necessity on the social relations and aboriginal politics, for the intercultural professional exercise of educator, appealing the bibliographical survey and participant comment as method; not directive interviews, photographs, filmings and daily register in of field, as techniques carried through in the period of 2006 to 2007. Although to inhabit in the same area and to establish marriages between itself, individuals and groups express tensions, aggravated with the landmark and legal recognition of the area, which generated inter dispute and intraetnias, mainly with the intrusion of farmers, rizicultores and the form of governmental influence. A relation of rivalry, individual and collective was evidenced, suggesting the strengthenig and not it fractionly, of the fights external politics, interns and in way to the cultural diversity and social adversity

GÊNERO E RELAÇÕES DE PODER NO PENTECOSTALISMO: ESTUDO COMPARATIVO ENTRE A IGREJA DE CRISTO NO BRASIL E A COMUNIDADE EVANGÉLICA SARA NOSSA TERRA

Based on the empirical comparative study between two churches from Pentecostal guidance - both located in Parnamirim/RN - and supported on a dialogic interaction between my interlocutors and theoretical references, I proposed me to reflect about how this protestant segment represents and articulates questions such as gender and power relationships, and the daily impact of that in their followers life. In other words, this dissertation aims to understand the reason of the asymmetry attributed to male and female, especially in what concerns the distribution of ecclesiastic works and the authority given to male, as well as the implication of this reality in the reconfiguration of morality and religious praxis in daily life of individuals and involved groups. From this perspective, this work was divided in three chapters, in which I investigate the tension/relationship between faith and secularism, for from this question on concessions and/or prohibitions related to the limits and involvement of the followers with the world and with the very Pentecostal ethos arise. I also analyze here aspects concerning to both ecclesiastic hierarchy and power, with the objective of elucidating how it occurs, what kind of criteria and implications they consider as well as about the nature of the religious labor division between men and women and, finally, I try to understand how the conversion/adhesion of members is reflected in the redefinitions of gender and its relationship between the ecclesiastical and domestic spaces. The diligence and energy spent in this work is in the hope that its fruits can corroborate in the expansion of anthropological knowledge which, in this particular case, involves the Brazilian Pentecostal phenomenon

Geografia da dominação: um estudo sobre a organização espacial da terra do sal (Macau-RN)

This work aims to understand the spatial organization in the Town of Macau, State of Rio Grande do Norte, Brazil. This approach focus on bringing back the history of the town, the main personages responsible for the construction of this place, denominated "social agents", as well as its social processes and the spatial forms derived from them. As the personages and their practices were identified, it was found out the existence of a driving force for structuring, interlocking, and maintaining the actions carried out by the social agents during the time. Such actions were materialized in the urban space: "the social segregation". The social segregation takes place as a specific geography of domination. The outcome of those owning the best areas" and ways of accessibility in the urban space, varies from the enrichment by property valorization, because of the concentration of public investments of infrastructure, to the comfort of easily reaching all the daily needs related to the displacements in the urban space. In the latter case, such facility has contributed to improve life quality. While one takes advantage of the location in the urban space, others are negatively affected by the same process. This research identified the salina worker as the weakest element of this social structure, occupying the urban periphery of the town of Macau. Such area is characterized by the lack of services and urban equipment in opposition to the center of the town, the locus of elite. This way, it is established the most known segregation pattern: center x periphery, in which the space acts as a mechanism of segregation

Estudo da formulação de pré-misturas secas para a cimentação de poços em terra

An economical solution for cementing oil wells is the use of pre-prepared dry mixtures containing cement and additives. The mixtures may be formulated, prepared and transported to the well where is added water to be pumped.Using this method, becomes dispensable to prepare the cement mixes containing additives in the cementing operation, reducing the possibility of error. In this way, the aim of this work is to study formulations of cement slurries containing solid additives for primary cementing of oil wells onshore for typical depths of 400, 800 and 1,200 meters. The formulations are comprised of Special Class Portland cement, mineral additions and solids chemical additives.The formulated mixtures have density of 1.67 g / cm ³ (14.0 lb / gal). Their optimization were made through the analysis of the rheological parameters, fluid loss results, free water, thickening time, stability test and mechanical properties.The results showed that mixtures are in conformity the specifications for cementing oil wells onshore studied depths

Nesta terra, em se plantando tudo dá? Política de Soberania e Segurança Alimentar e Nutricional no meio rural paranaense, o caso do PAA

O tema proposto nesta tese vai ao encontro do atual debate em curso no Brasil e no mundo acerca de duas dimensões da cadeia agroalimentar: produção e consumo. Desse modo, as questões de como se dá essa relação frente às estratégias locais por diferentes atores, terá ênfase. Para isso, como campo empírico foram escolhidos três municípios localizados no território Centro-Sul do estado do Paraná: Irati, Inácio Martins e Fernandes Pinheiro que desde 2004 estão inseridos no Programa de Aquisição de Alimentos (PAA), mais especificamente na modalidade Compra com Doação Simultânea (CDS). A hipótese que embasa este estudo é de que o PAA poderá ser capaz de assumir um caráter estruturante - a partir do seu viés pedagógico, capacidade organizativa de produção, manutenção da diversidade ou resgate da policultura (e aqui se privilegia a agroecologia), bem como uma alternativa viável de acesso a um tipo de mercado (mercado institucional) -, não por altruísmo dos atores, mas por ser mais vantajoso ser parte integrante, do que estar à parte do processo, aliando a isso melhorias nas condições alimentares tanto das suas famílias, quanto das entidades receptoras. O objetivo principal foi analisar as relações sociais e as práticas alimentares de um grupo de agricultores(as) agroecológicos entre as responsáveis pelo recebimento dos alimentos doados buscando compreender se o PAA possibilita a Soberania e Segurança Alimentar e Nutricional (SSAN) de grupos sociais (como das famílias rurais) e das pessoas atendidas por estas entidades. A metodologia utilizada foi a de estudo de caso. Como procedimentos foram empregados entrevistas semi-estruturadas e aplicação de questionários como: Escala Brasileira de Insegurança Alimentar(EBIA) e Questionário de Frequência de Consumo Alimentar(QFCA). A amostra foi composta por agricultores(as)/ fornecedores(as) do PAA, nutricionistas e, coordenadora de uma das entidade dos seus produtos é, de fato, o que os mobiliza a continuar produzindo em maior diversidade e quantidade. Após a vivência dos(as) agricultores(as) /fornecedores de estarem inseridos no Programa foi possível para estes atores se sentirem parte do processo e, assim, repensar suas práticas de produção de alimentos, seja ela destinada ao autoconsumo, seja voltada à comercialização. Para além da discussão acerca da produção destinada ao autoconsumo, ficou claro o processo de recampesinização entre as famílias de agricultores(as). O processo de (re)conexão se apresenta de forma frágil, considerando, sobretudo, as considerações feitas pelas mediadoras. Trazer à tona o debate acerca da produção-consumo de alimentos, tanto na perspectiva de quem produz, como na de quem consome, e tomando por referência a operacionalização de políticas públicas, viabiliza a ampliação de debates e a concretização de ações mais contundentes numa perspectiva de minorar a situação de vulnerabilidade (social e alimentar) e de pobreza rural

"Eis que a semente caiu em boa terra": a avenida Cruz Cabugá no Recife-PE como campo religioso local

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

Concentração da posse da terra e o programa nacional de crédito fundiário - uma análise para o estado do Rio Grande do Norte, 2006 - 2012

O objetivo do trabalho é propor um estudo sobre a relação do Programa Nacional de Crédito Fundiário - PNCF, no estado do Rio Grande do Norte, e sua concentração fundiária. Ou seja, se o PNCF está sendo direcionado, para as microrregiões que apresentam maior índice de concentração, de acordo com o índice de Gini, e se as áreas adquiridas através do crédito fundiário estão emergindo nestas microrregiões. Para isto, o estudo levantou a hipótese de que o PNCF no estado do Rio Grande do Norte não está sendo conduzida, de modo a reduzir a concentração fundiária, dentre as microrregiões do estado. Ou seja, não existe correlação entre o índice de Gini, da concentração fundiária, e as áreas adquiridas através do programa. Além disso, o trabalho buscou realizar uma discussão da literatura sobre os programas de reforma agrária assistida pelo mercado. Apresentando os autores que são exaltadores do modelo e das suas potencialidades, atrelando as causas dos problemas levantados como sendo de ordem técnica e operacional, onde os principais autores desta linha são: Van Zyl, Kirsten & Binswanger, (1996), Deininger & Binswanger, (1999). Têm-se também a apresentação da posição dos autores adeptos as políticas fundiárias pautadas na dinâmica e liberação dos mercados de terras, mas que visam contribuir com estudos que permitam uma redução para o custo elevado e a sua incapacidade de abarcar a esfera social, em decorrência do pagamento á vista e a preço de mercado aos donos das terras, são eles: De Janvry & Sadoulet (2002), Gordillo (2002), Banerjee (1999), Jaramillo (1998) e Burki & Perry (1997). Todavia, apresentou-se a corrente de autores que ressalta a natureza socialmente agressiva da Reforma Agrária Assistida pelo Mercado (RAAM), sendo os seus principais contribuidores: El-Ghonemy (2001); Barros, Schwartzman & Sauer (2003); Borras Jr. (2006, 2003 e 2003a); Garoz et al. (2005); Sauer & Pereira (2006); Pereira (2005, 2006 e 2010); Sauer (2010); Lahiff, Borras Jr. & Kay (2007). Em sequência, o trabalho apresentou a transição e características dos programas de acesso à terra, no Brasil, a partir da década de 1990, bem como, alguns indicadores do PNCF, no Brasil e o estado do Rio Grande do Norte. Apresentou-se também os indicadores da concentração fundiária, no Brasil e no estado. Através dos dados do Censo Agropecuário de 2006 foi possível calcular o índice de Gini da distribuição fundiária nas microrregiões no estado do Rio Grande do Norte. Com os dados fornecidos pela Secretaria de Estado de Assuntos Fundiários e de Apoio à Reforma Agrária - SEARA mostrou-se a distribuição das linhas de crédito do PNCF e as áreas adquiridas, entre os anos de 2006 e 2012. Por fim, o valor do coeficiente de correlação simples (r) igual a (0,2865), que com base no teste bilateral da distribuição de t de Student chegou-se no resultado para T calculado no valor de (1,2333), que ao ser comparado com o valor de T crítico igual a (2,898), com 17 graus de liberdade, a um nível de significância de 1%, pode aceitar a hipótese de partida, ou seja, que o PNCF não estava sendo direcionado para diminuir a concentração fundiária no estado

Formação moral das crianças: construção de regras fundamentais aos valores do Movimento dos Trabalhadores Rurais Sem Terra (MST)

The acquiring process of morals on a person is one of the most important aspects of his Social Identity. The basis for his ethics and moral choices are built when he interacts with the world. A child that interacts with participants of Movimento Sem Terra (MST) movement that fights for the Land Reform and the transformation of the society may have the opportunities to acquire the culture, morals and ethics of this movement. Based on this understanding, this work intends to comprehend how children think and incorporate the rules that are the base of the values and principles of MST, considering the diversity of the situations, the limits and the possibilities to experience these values in their everyday life in the Movement. To understand how the process of cognitive construction of the rules takes place in a child, it is important to consider the theories of Jean Piaget. According to him, morals development follows a sequence: the anomie (0 to 2 years old), marked by the absence of rules; the heteronomy (2 to 6/7 years old), where takes place the adoption of rules due to exterior obedience, such as a relative, an institution or a movement; and the autonomy (from 6/7 years old on), in which rules are considered legitimate. All the children in this research have relatives working at MST. The research has two parts. We have first observed the behavior of three groups of children (beyond six years old) while they were involved on their normal activities (kindergarten) activities. On the second moment, we have interviewed 20 children (between 3 and 10 years old). We used flashcards containing scenes; we also told stories and asked moral questions involving the character s behavior. We have noticed the unilateral respect and extern coercion are between the definers of the moral decisions of a child. The empathy and the reduction of the egocentrism help seeing the situation of the point of view of other, although it doesn t mean that one is going to accept others point of view. In the taking decision of the child other factors are also considered such as the space of socialization (family, school). Though the children don t work or take part at MST activities, they have already opinions about involved people behaviors. The interaction with relatives and teachers is one of the most important aspects to encourage them elaborate moral understandings according to the ethics of this movement

A formação do professor em diferentes espaços socializadores: um olhar sobre os alunos do curso Pedagogia da Terra da UFRN

This work is an analysis about the teacher's formation starting from certain aspects of its culture. It is supposed that the teacher is constituted in an individual that acts starting from singular aspects, in an individual point of view, but at the same time it interacts with other individuals in an environment strongly marked by the culture. Those two dimensions are representatives of the socio-cultural characteristics and they can be seen in the perspective of the individual and collective identity. Based on those presuppositions we chose, as reference, four environment of formation: the family, the school, the work and the Movement of the Rural Workers Without-Soil/MST (MST: The without-soil-ones in Portuguese) observing as the teachers refers to those environment highlighting, mostly, the formative aspects stood out. The individuals researched are teachers involved in the education of settled communities, who are students of the Earth Pedagogy course of the Universidade Federal do Rio Grande do Norte/UFFRN. For our analyses, we used narrative texts, written by the teachers, as conclusion of the discipline History of the Brazilian Education in which they tell their life histories. The speeches show as the environments of reference influence in their world conceptions, attitudes and values that not just mix in an individual dimension, but also collective. The research make us reflect about the possibility to think on the educational action starting from that understanding of wide formation considering the present elements in the courses of teacher's life

Luta pela terra, luta pela palavra: história de vida e formação de duas educadoras populares do campo

This project has resulted from a reunion between me and two teachers with whom I had already worked, pedagogically counseling them during the execution of the Project of Youngsters and Adults Schooling at the Agrarian Reform Settlements in the State of Sergipe (PAJA/PRONERA) between 2002 and 2003. The matter that really motivated the research was related to the essential principle that guided the accomplishment of the PAJA s teachers education and professionalization: understanding their reality and knowing their needs, promoting the dialogue between scientific and common sense knowledge. Taking as a reference the fact that the teachers education is not restricted to the academic qualification, that is, that it is a part of the educational process, which, in turn, is a result of each one s personal background, dialectically individual and collective, the access to the teachers reality and needs was accomplished by studying their backgrounds, especially their school and professional career. They, inevitably, focused themselves on the country life s social and cultural context, that could be better understood by living together with the teachers during the twenty-seven days I stayed in the Golfo s settlement, located in the town named Pacatuba/SE. The approach to the teachers lives through their stories and the daily contact proved how much Science is still distant from the peasants routine, sometimes being presented to them as a finished product . That way, the dialog between those two categories and the expectation of the country life s social and cultural conditions, together with the education, in which teachers have an essential role, still remain as a challenge

Passivo ambiental e o setor de exploração de petróleo em terra: abordagem teórica e percepção institucional dos impactos ambientais gerados na atividade

The search for a sustainable development is result of the exhaustion of the natural resources of the planet that demands globalizated politics with practical of compatible economic development with the protection of the quality of life for the future generations. This work presents a study on the thematic on the environmental liabilities in the organizations with focus in the industry of the oil and the production of oil in land in the state of Rio Grande do Norte. Some types of environmental liabilities are presented, as well as, some estimates techniques. Moreover, this work presents surveys of some variable that stimulate the organizations to implant technologies of reduction of the impacts in the environment as: the environmental legislation, costs, the main impacts of the production of oil in land. On the basis of the bibliographical research and in the identified variable, it was carried a case study with state and municipal technician that act in the sectors of fiscalization (IBAMA-RN and IDEMA-RN) with the objective to deepen the discussion regarding the impacts of the industry of the oil, the effectiveness of the current law, the performance of the institutions the federal level and how to prevent impacts in the environment. It was observed that the environmental liabilities are a little spread subject in the organizations, perhaps to be unknown and of few theoretical referencees at the national level, regarding to the evaluation techniques. At the same time, absentee in the national politics that conducts the oil exploration

Efeito da inclinação do plano de terra para antenas de microfita multicamadas com elementos parasitas fractais

This work presents the analysis of an antenna of fractal microstrip of Koch with dielectric multilayers and inclinations in the ground plane, whose values of the angles are zero degree (without inclinations), three, seven and twelve degrees. This antenna consists of three dielectric layers arranged vertically on each other, using feeding microstrip line in patch 1, of the first layer, which will feed the remaining patches of the upper layers by electromagnetic coupling. The objective of this work is to analyze the effects caused by increase of the angle of inclination of the ground plane in some antenna parameters such as return loss, resonant frequency, bandwidth and radiation pattern. The presented results demonstrate that with the increase of the inclination angle it is possible to get antennas with characteristics multiband, with bigger bandwidth, and improving the impedance matching for each case analyzed, especially the larger angle

Otimização de um sistema de distribuição predial de água fria: estudo de caso

This dissertation presents a methodology to the optimization of a predial system of cold water distribution. It s about a study of a case applied to the Tropical Buzios Residential Condominium, located in the Búzio s Beach, Nísia Floresta city, the east coast of the Rio Grande do Norte state, twenty kilometers far from Natal. The design of cold water distribution networks according to Norm NBR 5626 of the ABNT - Brazilian Association of Techniques Norms, does not guarantee that the joined solution is the optimal solution of less cost. It s necessary the use of an optimization methodology, that supplies us, between all the possible solutions, the minimum cost solution. In the optimization process of the predial system of water distribution of the Tropical Búzios Condominium, is used Method Granados, that is an iterative algorithm of optimization, based on the Dynamic Programming, that supplies the minimum cost s network, in function of the piezometric quota of the reservoir. For the application of this Method in ramifies networks, is used a program of computer in C language. This process is divided in two stages: attainment of the previous solution and reduction of the piezometric quota of headboard. In the attainment of the previous solution, the minors possible diameters are used that guarantee the limit of maximum speed and the requirements of minimum pressures. The piezometric quota of headboard is raised to guarantee these requirements. In the second stage of the Granados Method, an iterative process is used and it objective is to reduce the quota of headboard gradually, considering the substitution of stretches of the network pipes for the subsequent diameters, considering a minimum addition of the network cost. The diameter change is made in the optimal stretch that presents the lesser Exchange Gradient. The process is locked up when the headboard quota of desired is reached. The optimized network s material costs are calculated, and is made the analysis of the same ones, through the comparison with the conventional network s costs

Olhar em terra de cego: a visualidade em Ensaio sobre a Cegueira

"Looking at earth from blind: travel in the visuality of the test on Blindness" is a literary Essay resulted from the experience of different points of view regarding the Essay on Blindness (1996), not only showing a Modern aesthetical tendency in dialog with the Baroque one, but also discussing subjects related to the History of Mentalities. The chapters are disposed as follows: The first one presents a short Excursus about the author and his work; the second one introduces the concept of Allegory exemplifying it with representative images of Romance; the third one presents tragic elements in dialog with the Bataille Eroticism in an Allegory of Feeling; the fourth one shows Stylistic Features used as a display mean of Comedy in Romance going towards the musicalness, being the features used to provoke laugh; the fifth and last one discusses about the study pertinence. To conclude, in favor of a Sight Education, the study considered authors such as: Ariès (1977), Bataille (2003), Bakhtin (2002, 2000, 1999), Benjamin (2000, 1996), Chauí (2005, 2000), Foucault (2006, 2005, 2004, 2002), Freud (1970), Hansen (2006), Lino (2004), Sartre (2005), Vovelle (1996)