949 resultados para 1200
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Pós-graduação em Zootecnia - FMVZ
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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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Demand for potassium in Brazil is large and is constantly increasing, but only about 5% of all consumed potassium is produced in the country. This low domestic production implies high rate of potassium imports, leaving the country vulnerable in the event of any difficulty to import this product and currency fluctuations. The modified glauconite is a rock that has a high potential for potassium exploration, found in Minas Gerais state, its extraction is relatively cheap and the prospected rock volume is high. The difficulty for its use as a direct source of potassium is in its low solubility. Thus, the objective of this study was to perform a chemical and mineralogical characterization of the modified glauconite and evaluate the effectiveness of techniques and treatments in the potassium solubilization contained in the rock. For this study, it was used characterization techniques such as X-ray diffraction, scanning electron microscopy, diffraction by Synchrotron Light and chemical analysis of high and low power of potassium extraction. Also granulometric testing and thermal treatments with different forms of calcination were carried out. Overall, it was found that the modified glauconite is a compound of minerals, of the mica groups K-feldspar and quartz and calcination substantially alter the crystal structure of these minerals, increasing the potassium availability. While the natural solubility of glauconite modified be very low, rock calcination added with high fluxes of calcium and low magnesium content at 1200 °C led to potassium solubility increase in order of 100 times compared to that observed in the glauconite natural modified.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
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En este documento se analizan los cambios y continuidades ocurridos en materia de incorporación social en El Salvador, Guatemala y Nicaragua desde los años noventa. Para ello, se estudian las pensiones por vejez, los servicios de salud y las transferencias monetarias condicionadas (TMCs), especialmente, en sus relaciones con los servicios de salud. Interesa particularmente determinar los avances hacia una incorporación universal —la más efectiva para la redistribución del ingreso—, la cual tiene lugar cuando los programas sociales combinan coberturas amplias con beneficios robustos y altos grados de equidad. En el estudio se demuestra que ha habido mejoras significativas en términos de incorporación social, pero que ésta ha sido, en general, de carácter segmentado antes que universal. Persisten problemas significativos en materia de cobertura, suficiencia y equidad en salud y pensiones, mientras que las TMCs han tenido capacidades muy desiguales para influir positivamente en los otros sectores de política social. Con esta trayectoria como rasgo común, El Salvador ha dado pasos especialmente significativos para promover el universalismo en el sector salud, no así en pensiones.
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Pós-graduação em Ginecologia, Obstetrícia e Mastologia - FMB
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Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)