Chemistry Weathering
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Lignin-modified road marking paint: weathering aging studies
Abstract The accelerated artificial aging with ultraviolet radiation, viscosity, density, no-pick-up time, flexibility, and abrasion resistance of lignin-modified road marking paint were evaluated. The addition of lignin did not cause significant changes in the physical chemistry, flexibility and no-pick-time test compared to the precursor paint. The additio
REM, Int. Eng. J.. Publicado em: 2021-06
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2. Modeling and prediction of sulfuric acid digestion analyses data from PXRF spectrometry in tropical soils
ABSTRACT Sulfuric acid digestion analyses (SAD) provide useful information to environmental studies, in terms of the geochemical balance of nutrients, parent material uniformity, nutrient reserves for perennial crops, and mineralogical composition of the soil clay fraction. Yet, these analyses are costly, time consuming, and generate chemical waste. This wor
Sci. agric. (Piracicaba, Braz.). Publicado em: 04/11/2019
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3. Apatite multi-generations in the Três Estradas Carbonatite, Southern Brazil: physical and chemistry meaning and implications to phosphate ore quality
Abstract Carbonatites were recently discovered in Southern Brazil, which increased the interest to evaluate the economic potential of these uncommon rocks, especially the Três Estradas Carbonatite. Carbonates are the dominant minerals of fresh rock followed by apatite, but the weathering process makes apatite abundant. We focused on apatite from the carbona
Braz. J. Geol.. Publicado em: 01/07/2019
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4. Stratigraphy, petrography and tectonics of the manganese-bearing Buritirama Formation, Northern Carajás Domain, Amazon Craton
Abstract The Buritirama Formation (BF) occurs at the extreme north of the Carajás Province, close to the contact with the Bacajá domain, in the southeastern portion of the Amazon Craton (Brazil). The BF consists of a 40 km long, ca. 3 km wide NW-SE trending structure arranged in four imbricated thrusts that individualize three main stratigraphic units. The
Braz. J. Geol.. Publicado em: 15/04/2019
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5. Temporal Geobiotic Mapping: a conceptual mapping technique toward visualising geobiotic areas in cross-section
Geobiota are defined by taxic assemblages (i.e., biota) and their defining abiotic breaks, which are mapped in cross-section to reveal past and future biotic boundaries. We term this conceptual approach Temporal Geobiotic Mapping (TGM) and offer it as a conceptual approach for biogeography. TGM is based on geological cross-sectioning, which creates maps base
Rev. Bras. entomol.. Publicado em: 20/09/2013
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6. Aspectos da biogeoquímica dos rios Teles Pires e Cristalino - MT / Aspects of the biogeochemistry of Teles Pires and Cristalino rivers - MT
The Amazon basin occupies around 40% of the brazilian territory and contains more than 60% of the water resources of the country. Abundant and yet little exploited region water resources constitute a national treasure to which the nation can not turn its back. Besides changes in land use/cover, several hydroelectrical plants are planned for rivers in the reg
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/06/2012
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7. Relações solo-vegetação no Parque Nacional da Serra do Cipó, Espinhaço Meridional, Minas Gerais / Soil vegetation relationships in the National Park Serra do Cipó, in Espinhaço Meridional, Minas Gerais
The region of Serra do Rio Cipó, in the southern part of the Serra do Espinhaço, comprises large areas of Cerrado, Atlantic forest, forest islands and one of the richest high-altitude rocky vegetation in Brazil. The ecotonal character between the Cerrado and Atlantic Forest biomes, described in many studies of regional flora and fauna, is one of the factor
Publicado em: 2009
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8. InfluÃncia do nitrogÃnio na produÃÃo de substÃncias degradadoras do milonito por cladonia substellata (lÃquen)
As rochas sÃo colonizadas pelos liquens, que contribuem, junto com outros fatores ambientais, para o processo de formaÃÃo do solo. Os liquens tÃm a capacidade de adaptaÃÃo a ambientes das mais variadas caracterÃsticas, e assimilam nutrientes contidos na umidade atmosfÃrica, interagindo com os demais fatores do ecossistema. Neste contexto, a captaÃÃ
Publicado em: 2009
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9. Geologia, geometalurgia, controles e gênese dos depósitos de fósforo, terras raras e titânio do complexo carbonatítico Catalão i , GO
This work describes the geological and geometallurgical characteristics of the phosphate, titanium, niobium and rare-earth elements deposits in the northeast part of the Catalão I carbonatite complex, Central Brazil. The mineralization controls were determined for magmatic, metasomatic and weathering processes. The ore types were defined on the basis of geo
Publicado em: 2008