819 resultados para Mineração e beneficiamento de urânio
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Geografia - IGCE
Educação ambiental em resíduos sólidos nas unidades escolares municipais de Presidente Prudente – SP
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Pós-graduação em Geografia - FCT
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In soil surveys, several sampling systems can be used to define the most representative sites for sample collection and description of soil profiles. In recent years, the conditioned Latin hypercube sampling system has gained prominence for soil surveys. In Brazil, most of the soil maps are at small scales and in paper format, which hinders their refinement. The objectives of this work include: (i) to compare two sampling systems by conditioned Latin hypercube to map soil classes and soil properties; (II) to retrieve information from a detailed scale soil map of a pilot watershed for its refinement, comparing two data mining tools, and validation of the new soil map; and (III) to create and validate a soil map of a much larger and similar area from the extrapolation of information extracted from the existing soil map. Two sampling systems were created by conditioned Latin hypercube and by the cost-constrained conditioned Latin hypercube. At each prospection place, soil classification and measurement of the A horizon thickness were performed. Maps were generated and validated for each sampling system, comparing the efficiency of these methods. The conditioned Latin hypercube captured greater variability of soils and properties than the cost-constrained conditioned Latin hypercube, despite the former provided greater difficulty in field work. The conditioned Latin hypercube can capture greater soil variability and the cost-constrained conditioned Latin hypercube presents great potential for use in soil surveys, especially in areas of difficult access. From an existing detailed scale soil map of a pilot watershed, topographical information for each soil class was extracted from a Digital Elevation Model and its derivatives, by two data mining tools. Maps were generated using each tool. The more accurate of these tools was used for extrapolation of soil information for a much larger and similar area and the generated map was validated. It was possible to retrieve the existing soil map information and apply it on a larger area containing similar soil forming factors, at much low financial cost. The KnowledgeMiner tool for data mining, and ArcSIE, used to create the soil map, presented better results and enabled the use of existing soil map to extract soil information and its application in similar larger areas at reduced costs, which is especially important in development countries with limited financial resources for such activities, such as Brazil.
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Coffee seeds have limitations regarding to its conservation because of their sensitivity to desiccation and storage behavior. The establishment of a methodology for seed storage is difficult due to its deterioration. Deterioration can enhance the production of reactive oxygen species and cause lethal oxidative damage to plant tissues. The damage caused by harmful levels of free radicals can be softened by the action of endogenous or exogenous antioxidants. Recent research shows new antioxidative protection technologies, being cathodic protection a promising technique with relevant results in other recalcitrant species and even in other living organisms. Thus, the aim of this work was to verify the antioxidant effect of cathodic water in Coffea arabica L. seeds with the purpose of investigating a new technology to improve seed quality. The study was conducted at the Central Seed Laboratory, Department of Agriculture, at the Federal University of Lavras. Coffea arabica L. seeds were used. The study was conducted in two stages, in the first a preliminary analysis of the use of cathodic water was carried out in batches with different levels of quality. In the second it was evaluated the effect of light and of the imbibition period of the seeds in cathodic water. The seeds were immersed in distilled water and in cathodic water for eight distinct soaking periods, in absence and presence of light and then evaluated by physiological tests. It can be concluded that cathodic water can positively influence the physiological performance of the coffee seeds with poor quality, especially when embedded during periods between 4.5 to 7.5 hours in the absence of light.
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Despite tobacco being a culture propagated by seeds, there is little information concerning tests that allow the distinction of similar germination lots in different levels of vigor. The diversity of cultivars available in the market, and a few peculiarities of the species, such as uneven maturation of the flowers, fruits and seeds, small size and seed dormancy, are considered obstacles for obtaining lots of tobacco of high physiological potential. Thus, this research was developed with the objective of adapting feasibility and vigor tests for evaluating the physiological potential of tobacco seed lots. We used nine lots of tobacco seeds of cultivar CSC 447 and nine lots of seeds of cultivar BAT 2101, belonging to variety groups Virginia and Burley, respectively. Initially, germination test was conducted to characterize the profile of the lots. For determining the feasibility and vigor of the tobacco seeds, germination tests were conducted in distinct temperatures, controlled emergence conditions, electric conductivity, artificial aging and in tetrazolium. For determining the isoenzymatic marker for seed quality, analyses were conducted with enzymes catalase, esterase, malate dehydrogenase and alcohol dehydrogenase. In conclusion, the emergence tests at 25oC and artificial aging at 41oC for 72 hours, are efficient in discriminating the lots of tobacco seeds in different levels of vigor. The electric conductivity and germination tests in different temperatures have distinct responses in relation to the genotype of the tobacco seeds. The tetrazolium test using the methodology with pre-conditioning in 3.5% sodium hypochlorite solution and subsequent emersion in 1.0% tetrazolium solution for 18 hours is efficient for the quick evaluation of the feasibility of tobacco seeds. The analysis of the profiles of enzymes catalase, esterase, malate dehydrogenase and alcohol dehydrogenase is efficient as markers for tobacco seed quality.
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O presente Estudo procura examinar as alterações da estrutura de produção dos países da América do Sul, ocorridas a partir de meados da década dos 90, entre outros objetivos para avaliar se vem aumentando ou diminuindo o grau de heterogeneidade entre as suas economias, particularmente com relação ao Brasil, e examinar as possibilidades de complementaridade entre os parques produtivos dos países da Região, também sob o ponto de vista da economia brasileira. Os indicadores utilizados neste Estudo deixam flagrantes as grandes diferenças de tamanho e de estrutura produtiva do Brasil com os demais países da Região.O Brasil tem participação expressiva no valor agregado em praticamente todos os setores. Na Indústria de Transformação, a participação brasileira no total da Região atingiu 52% em 2005 (na comparação a preços constantes), tendo sido mais de duas vezes superior ao produto argentino e mais de 5 vezes superior ao venezuelano. Os únicos setores nos quais o Brasil apresenta participações um pouco menos significativas são nos de Transporte, Armazenagem e Comunicações, no setor de Mineração (no qual o valor agregado pelo Brasil é inferior, a preços constantes, ao da Venezuela) e no Comércio Atacadista. A importância de cada país nas exportações da América do Sul variou substancialmente segundo setores da economia, como reflexo das disparidades de desenvolvimento relativo e da base de recursos naturais de cada economia. O Brasil apresentou participação importante nas exportações regionais em praticamente todos os setores da economia. Nas indústrias metal-mecânicas a participação brasileira no total exportado passou de 69% em 1985 para 80% em 2005. Para a América do Sul, como um todo, observa-se uma redução da importância das exportações de produtos agrícolas e bens não duráveis, em contrapartida a um aumento expressivo do peso das exportações de bens do setor mineral. O perfil exportador do Brasil, ao contrário dos demais países, é marcado por uma participação importante de setores produtores de bens com maior valor agregado e cadeia produtiva mais longa.
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Pós-graduação em Ciência da Computação - IBILCE
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Pós-graduação em Desenvolvimento Humano e Tecnologias - IBRC
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Pós-graduação em Ciências Biológicas (Zoologia) - IBRC
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O presente relatório, O Investimento Estrangeiro Direto na América Latina e no Caribe, é a edição correspondente a 2016 da série anual publicada pela Unidade de Investimentos e Estratégias Empresariais da Divisão de Desenvolvimento Produtivo e Empresarial da Comissão Econômica para a América Latina e o Caribe (CEPAL).
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Pós-graduação em Ciência Florestal - FCA
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Pós-graduação em Geografia - IGCE