1000 resultados para Matemática - Teses - Brasil


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Dissertação (mestrado)—Universidade de Brasília, Instituto de Ciências Exatas, Departamento de Matemática, Programa de Mestrado Profissional em Matemática em Rede Nacional, 2016.

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Tese (doutorado)—Universidade de Brasília, Faculdade de Educação, Programa de Pós-Graduação em Educação, 2016.

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Usando como base de informações a monografia sobre o grupo publicada pelo projeto Flora Ficológica do Estado de São Paulo (Programa BIOTA), o acervo depositado no Herbário Científico do Estado de São Paulo Maria Eneyda P. Kauffmann Fidalgo (SP), a Lista de Espécies da Flora do Brasil e artigos científicos, dissertações e teses (com descrições e ilustrações) temos: nove gêneros e 39 espécies de criptoficeas, sendo 16 espécies exclusivas para o Estado de São Paulo, todas registradas em ambientes de água doce. A carência de especialistas no Estado de São Paulo e no Brasil, além de problemas de estratégia amostral, necessidade de uso da microscopia eletrônica e ausência de estudos de biologia molecular, são fatores que devem ter subestimado o conhecimento taxonômico de Cryptophyceae no Estado.

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Esta dissertação estuda a problemática da conservação dos alçados da Rua Grande, localizada no Centro antigo da cidade de São Luís, capital do Estado do Maranhão, Brasil, a partir do crescimento urbano ocorrido principalmente a partir do século XIX à atualidade, com interferências devido às alterações do uso do solo. Iniciado com pesquisa in loco e nos departamentos de preservação do património arquitetónico do Município, Estado e Governo Federal, este estudo busca elaborar estratégias de intervenção adaptadas às necessidades locais, visando a participação da população, com cursos de educação patrimonial e consultas públicas. Esta proposta foi possível a partir da realização de diversas etapas de trabalho, partindo do enquadramento geral e histórico de São Luís, com foco específico na Rua Grande, discorrendo sobre a importância desta via ao desenvolvimento urbano da cidade. Desta forma, com vistas a possibilitar um melhor entendimento da morfologia urbana do Centro da cidade, analisou-se a malha delimitada pelo Anel Viário, importante via perimetral à zona central. Posteriormente, seguiu-se com a caracterização do acervo arquitetónico, com pesquisa acerca dos materiais e sistemas construtivos, permitindo o entendimento das diversas anomalias observadas a partir de análise laboratorial das amostras coletadas em algumas edificações. A elaboração de Cartas Temáticas permitiu um melhor entendimento de situações como uso do solo, gabarito, estilos arquitetónicos e dos estados de conservação e preservação, contando com o estudo da legislação local, o que permitiu, posteriormente, delinear-se as estratégias de intervenção. /SUMMARY: This dissertation examines the problems related to the conservation of the facades of the Grande street, located in the old city center of São Luis, capital of the northeastern state of Maranhão, Brazil, caused by the extensive urban growth that occurred from the XIX century to the current days, with numerous interferences due to changes in the building codes. The study began with a research in the federal, state and municipal departments of architectural heritage. The main objective was to suggest strategies of intervention adapted to the local needs, with community participation such as educational courses and public consultations. This proposal was made possible after completing several phases of work, starting with the general framing and historical background of São Luis, focusing on the Grande street, portraying the important role played by this street in the urban development of the city. Thus, with the intention of allowing a better understanding of the urban morphology in the city center, an analysis was made within the area limited by the road ring that surrounds the center. The study continued with the characterization of the architectural estate, with a research about the materials and construction systems, allowing the understanding of the several anomalies observed in the laboratorial analysis on the samples gathered from some buildings. The elaboration of the Thematic Charts allowed for a better understanding of the situation, such as land use, building codes, architectural styles and level of conservation and preservation, taking into account the local regulations, which made possible to set out some strategies of intervention.

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This study focus on the reconfiguration of educational management in Argentina, Brazil, Chile and Mexico, which was promoted by the new logic of social regulation and the new role attributed to the State, considering each country's own historicity. So, the cultural factors that interfere on the dynamics of the 90' school reform are analyzed. Aspects that show the homogeneity or heterogeneity of these reforms in the region, as well as local specificities that block out the concretization of the reform are underlined. It is shown that the historicity that characterizes the educational reform has taken, in each country, a form that can be called, in Mexico, conservative rupture; in Chile, conservative continuity; in Brazil, conservative renovation; and, in Argentina, interrupted rupture. Some conclusions about the impact of educational reform in the selected countries are recuperated through the analysis of 186 academic texts on the subject.

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This article analyses the emergence and development of social policies for children and adolescents attendance that are in line with the development process of the Brazilian social protection system, focusing on some of the main representations attributed to childhood, according to the historical and political periods. It seeks to present the notion of childhood instituted under the constitution of the Brazilian welfare state, in such a way as to place it within the broader context of the historical and political transformations that involved the emergence and consolidation of the social policies directed towards children and adolescents in Brazil in the 20th century and the beginning of the 21st.

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The purpose of this article is to develop some ideas that may contribute to the debate about the secondary education in Brazil, giving emphasis to the conditions existing in the educational institutions, the ongoing educational policies and the challenges posed by the social, economic and political reality of the country. It is also discussed the political, social and economic importance of the expansion and the compulsory character of secondary education as well as the school's culture dimension, in its relationship to the so-called knowledge society. Finally, the role of secondary education for the youth and the new demands it poses for teachers are presented, among some others aspects.

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This article takes the concepts of biopower and governmentality as the starting point for an analysis of certain recent Brazilian government documents about the introduction of Philosophy as a subject in secondary school. In the 1980s, this argument centered on Philosophy's so-called criticism and its potential for preparing citizens for a democratic society, was used by the movements aimed to restore democracy in Brazil. This argument appears to have been assimilated by the Brazilian government, because it is stated in the Guidelines and Bases of Education Law, secondary school students should demonstrate knowledge of philosophy necessary for the exercise of citizenship. The argument also appears in documents such as the PCN and PCN+ (National Curricular Parameters) and OCEM (Curriculum Guidelines for Secondary School) in their chapters on Philosophy. These documents are examined here in the light of governmentality, making explicit how Philosophy is equipped to train young people according to what is understood as a modern democratic society.

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Chemical research in Brazil has grown significantly in the past 20 years, largely thanks to the Brazilian S&T Development Program of the federal government (PADCT). However, the newly achieved levels of highly qualified manpower and research infra-structure require new research organization frameworks to make science, technology and innovation really useful and meaningful for the citizens. The current requirements for creating viable networks of academic and industry researchers are presented and discussed as well as some structural and procedural bottlenecks that have to be eliminated, to achieve maximum high-quality science, technology and relevant innovation output.

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Chemometric activities in Brazil are described according to three phases: before the existence of microcomputers in the 1970s, through the initial stages of microcomputer use in the 1980s and during the years of extensive microcomputer applications of the ´90s and into this century. Pioneering activities in both the university and industry are emphasized. Active research areas in chemometrics are cited including experimental design, pattern recognition and classification, curve resolution for complex systems and multivariate calibration. New trends in chemometrics, especially higher order methods for treating data, are emphasized.

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Quimica Nova and the Journal of the Brazilian Chemical Society are two examples of successful initiatives taken by the Brazilian Chemical Society (SBQ - Sociedade Brasileira de Química), and may serve as models for the scientific societies of developing countries. Pillars of the SBQ, these two periodicals are undeniable demonstrations that idealism, utopia and dignity are the essential ingredients for transforming dreams into reality. Few believed that the Brazilian chemical community would one day have, as it does today, two scientific research periodicals indexed in the principal international data banks.

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The copper and cadmium complexation properties in natural sediment suspensions of reservoirs of the Tietê River were studied using the solid membrane copper and cadmium ion-selective electrodes. The complexation and the average conditional stability constants were determined under equilibrium conditions at pH=6.00 ± 0.05 in a medium of 1.0 mol L-1 sodium nitrate, using the Scatchard method. The copper and cadmium electrodes presented Nernstian behavior from 1x10-6 to 1x10-3 mol L-1 of total metal concentration. Scatchard graphs suggest two classes of binding sites for both metals. A multivariate study was done to correlate the reservoirs and the variables: complexation properties, size, total organic carbon, volatile acid sulfide, E II and pH.

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The composition and biological activities of propolis, a resinous hive product collected by honeybees from various plant sources, depends on various factors such as season and vegetation of the area. The aim of this study was to evaluate the influence of the seasonal effect on the ethanolic extracts of Brazilian propolis (EEP) type 6 and type 12, collected during 6 months in terms of antibacterial activity and phenolic composition. The antimicrobial properties were evaluated by MIC and MBC on S. mutans Ingbritt 1600 and the profile of chemical composition by UV-visible spectrophotometry, HPLC-RF and GC-MS. The results demonstrated that the season in which propolis is collected influences its chemical composition, resulting in modifications in its antibacterial activity.

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The objective of this study was to evaluate the horizontal and vertical structures of tree community in regeneration in a fragment of a secondary riparian forest at approximately 30 years of age and to identify the most abundant species in each fragment of the forest to determine the sucessional stage. An area of 800 m² was subdivided into 16 samples of 10 x 5 m and all individuals with DBH ≥ 1 cm were sampled and identified for the following analyzes: horizontal parameters (DR, FR, DoR, IVC and IVI), vertical parameters (PSR and RNR) and mixed parameters, from of value of increased importance index (IVIa). The survey measured 689 individuals, belonging to 38 families, 74 genus and 109 species. The total density was 8,614 individuals/ha. The index of Shannon´s diversity was 3.99 and the index of Pielou´s equability was 0.85. Tibouchina pulchra, Psychotria suterella and Endlicheria paniculata obtained high values of IVIa. Guarea macrophylla, Gomidesia anacardiaefolia, Xylopia langsdorffiana and Endlicheria paniculata achieved high values of RNT, indicating adequate natural regeneration in the plot. The initial secondary and umbrophylous species showed the highest ecological importance in this fragment of the forest, with the highest values of sociologic position and importance index. Furthermore, the presence of late secondary species in all layers suggest that the studied fragment is in intermediate succession degree.