Lixiviation
Mostrando 13-24 de 26 artigos, teses e dissertações.
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13. Caracterização hidrogeológica do aquífero cauê, quadrilátero ferrífero, MG: Subsídios para a gestão dos recursos hídricos no quadrilátero ferrífero
The Cauê aquifer encompasses the geological unit that is the host of the Iron Quadrangle bodies of iron ore (Cauê formation). It has got significant hydrogeological potential, which is used for part of the water supply for Belo Horizontes metropolitan area, and has got a fundamental importance for the maintenance of the general environmental conditions of
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/12/2007
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14. Graphite Functionalized in Conditions of Friedel-Crafts Reaction mediated by Radiation of Microwave: New Material for Construction of Electrodes of Carbon Paste / Grafite funcionalizada em condições de Friedel-Crafts mediada por radiação de microondas: novo material para construção de eletrodos de pasta de carbono
Modification and/or functionalization of eletrodic materials have been investigated in order to improve the application of chemically modified electrode (CME) regards on their sensitivity, selectivity and reactivity comparing with unmodified substrate. However, the stability and reproducibility of these CME are one of the most important goals to achieve main
Publicado em: 2007
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15. Resposta espectral do capim-tanzânia à adubação nitrogenada e densidades de plantio / Spectral response of Tanzania grass to nitrogen fertilization and planting density
The use of variable nitrogen rate application is more efficient, avoiding losses by lixiviation. Assuming that it is possible to discriminate nitrogen rates by the spectral response of forage crops, it becomes necessary the knowledge of this variable effect on the forage spectral response. The goal of the present research was to evaluate the effect of four n
Publicado em: 2007
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16. ESTABILIDADE E DEFORMAÇÃO DE TALUDES DE SOLO SOB CARREGAMENTO SÍSMICO / STABILITY AND DEFORMATION OF SOIL SLOPES UNDER SEISMIC LOAD
The seismic stability of slopes has been a topic of considerable interest in geotechnical engineering for the past 40 years. During that period, the state of practice has moved from simples techniques to more complicated numerical procedures. The simplest approach is the pseudo-static analysis in which the earthquake load is simulated by an equivalent static
Publicado em: 2006
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17. AVALIAÇÃO E MODELIZAÇÃO DA DINÂMICA DE CARBONO E NITROGÊNIO EM SOLO COM O USO DE DEJETOS DE SUÍNOS / Evaluation and simulation of soil carbon and nitrogen dynamics with the use of pig manure
The managedment of the pig manure, in the slurry or solid form (deep bedding), and how it is applied to the soil, in the surface or incorporated, must affect the dynamics of the C and the N in the soil. The objectives of this work were: 1) to evaluate the dynamics of the C and the N in soil and to evaluate the N supply to maize which were applied pig manure
Publicado em: 2005
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18. Estudo da Aptidão ao Desaguamento e do Potencial de Lixiviação Em Diferentes Tipos de Lodos Produzidos na Estação de Tratamento de Águas Residuárias da Coqueria da Companhia Siderúrgica de Tubarão
The coke oven production in steel industry generates a solid waste denominated coke sludge or coke mud. The large production of this material presenting substances with high environmental toxicity, demands a consolidated management comprising the processes of thickening, stabilization, conditioning, dewatering, sanitization and final disposition. Literature
Publicado em: 2004
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19. Environmental vulnerability analysis of the main recommended pesticides for cotton, rice, coffee, sugar cane, citrus, corn and soybean production systems / Analise da vulnerabilidade ambiental aos principais pesticidas recomendados para os sistemas de produção de algodão, arroz, café, cana-de-açucar, citros, milho e soja
The utilization of pesticides in agriculture is a necessary practice to control pests, diseases or weeds to reach an excellent index of productivity and get attend the increasing necessity of food. Some of this pesticides applied, show dangerous physical-chemical proprieties to the environmental and health human. Many times it happen because we haven?t enoug
Publicado em: 2004
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20. Influência da calcinação sobre a remoção de ferro da caulinita e ilita e seus efeitos sobre a acidez
Samples of natural clay composed by kaolinite, illite, goethite and quartz, were calcinated and submitted to lixiviation with citrate and chloridric acid in order to remove iron. Investigation due to extraction consequences was carried cut by analyzing its acid properties using ammonia gas as probe in infrared spectrophotometry analysis. The sample that were
Química Nova. Publicado em: 2003-03
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21. Cementação sólida empregando granulado elabora a partir de carvão vegetal reciclado e ativador de CaCO3 ecologicamente correto.
The objective of this study was to evaluate the influence of the use of recycled active carbon material and calcium carbonate, in state of toxic barium carbonate, as te agent for chemical activation, responsible for the generation of Carbon Monoxide (CO) during the pack carburizing process. This new process are considered ecologically correct and environment
Publicado em: 2003
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22. Taxas de mineralização e de lixiviação do nitrogênio, e alterações da fertilidade de um latossolo vermelho-amarelo degradado e outro não-degradado fertilizados com biossólido e florestados com Eucalyptus grandis / Mineralization and leaching of nitrogen, and fertility modifications of a degraded and non-degraded red-yellow latosol, amended with biosolid and cultivated with Eucalyptus grandis
Este estudo teve como objetivo avaliar os efeitos da aplicação de biossólido sobre as taxas de mineralização e de lixiviação de N, as modificações de fertilidade do solo, a nutrição e o crescimento de povoamentos de Eucalyptus grandis plantados em um Latossolo Vermelho-Amarelo Distrófico não-degradado (sob cultivo mínimo) e outro degradado. O e
Publicado em: 2003
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23. Hydrous Tantalum Phosphates for Ion Exchange Purposes: A Systematic Study
This work describes two methods of preparation of hydrous tantalum phosphates and their characterization as ion exchangers. The hydrous metallic phosphate compounds were chemically and physically characterized by thermal gravimetric analysis, X-ray diffractometry and surface area measurements. By the first method, tantalum phosphate was prepared by alkaline
Materials Research. Publicado em: 2002-03
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24. Métodos para avaliação do potencial fisiológico de sementes de melão. / Methods for the physiological potential evaluation in melon seeds.
This research was conducted to study and select procedures for the controlled deterioration, accelerate aging, electrical conductivity and potassium lixiviation tests, to verify their sensitivity to identify different vigor levels of melon (Cucumis melo L.) seed lots. Five seed lots each from the hybrids AF-646 and AF-682 were used. In the first experimental
Publicado em: 2002