Results 31 to 40 of about 181,129 (246)

Hydrophysical Database for Brazilian Soils (HYBRAS) and Pedotransfer Functions for Water Retention

open access: yesVadose Zone Journal, Volume 17, Issue 1, Page 1-17, 2018., 2018
Core Ideas We propose a Hydrophysical Database for Brazilian Soils (HYBRAS). Data in HYBRAS comprise 445 soil profiles, with 1075 samples of Brazilian soils. We compared the accuracy of water retention estimates based on climate‐based PTFs. In general, the Brazilian PTFs performed better than the temperate models for HYBRAS.
Marta Vasconcelos Ottoni   +4 more
wiley   +1 more source

Estimating recharge rates with baseflow separation in the Ibicuí Watershed (South America)

open access: yesRevista Águas Subterrâneas, 2016
This study aims to estimate the groundwater recharge rates in the Ibicuí Watershed, in the state of Rio Grande do Sul, using baseflow separation method. The watershed’s main aquifer is the Guarani Aquifer System, in its confined areas (West) and outcrop (
Camila Dalla Porta Mattiuzi   +3 more
doaj   +1 more source

Massive Submandibular Sialolith: Complete Radiographic Registration and Biochemical Analysis through X‐Ray Diffraction

open access: yesCase Reports in Surgery, Volume 2014, Issue 1, 2014., 2014
Sialolithiasis is a pathologic condition that affects 60 million people per year, which is caused by the presence of calcified structures, named sialoliths, inside the salivary glands and their salivary ducts. Despite the large incidence of sialolithiasis, its etiology is still unknown.
Ademir Franco   +7 more
wiley   +1 more source

Petrografia, geoquímica e geocronologia das rochas do orógeno Rio Alegre, Mato Grosso: um registro de Crosta oceânica mesoproterozóica no SW do Cráton Amazônico

open access: yesGeologia USP. Série Científica, 2004
As rochas vulcano-sedimentares do orógeno do Rio Alegre ocorrem no SW do Cráton Amazônico e compreendem rochas vulcânicas máficas e ultramáficas, rochas sedimentares químicas, além de rochas intrusivas máficas a félsicas.
João Batista de Matos   +4 more
doaj   +1 more source

Molecular Characterization of TP53 Gene in Human Populations Exposed to Low‐Dose Ionizing Radiation

open access: yesBioMed Research International, Volume 2013, Issue 1, 2013., 2013
Ionizing radiation, such as that emitted by uranium, may cause mutations and consequently lead to neoplasia in human cells. The TP53 gene acts to maintain genomic integrity and constitutes an important biomarker of susceptibility. The present study investigated the main alterations observed in exons 4, 5, 6, 7, and 8 of the TP53 gene and adjacent ...
Igor Brasil-Costa   +9 more
wiley   +1 more source

Recursos minerais não-metálicos [PDF]

open access: yesEstudos Avançados, 1998
OS RECURSOS minerais não-metálicos, embora muito importantes para o atendimento das necessidades da população e para o comércio exterior, são pouco contemplados pelas ações governamentais e ignorados pelo público. Geralmente não-incluída no planejamento territorial, a mineração de não-metálicos no Brasil causa extensos impactos ambientais mal ...
openaire   +4 more sources

Mineralogia do solo [PDF]

open access: yes, 2011
A fase sólida dos solos é composta de uma fracção mineral e uma orgânica. Por sua vez, a fracção mineral divide-se em lotes de dimensões que apresentam diferenças em relação à mineralogia e ao comportamento químico.
Sampaio, Elsa
core  

Estimation of recharge of the Guarani Aquifer system based on the application of the water-table fluctuation method in the Ibicui River-RS

open access: yesRevista Águas Subterrâneas, 2017
The estimation of groundwater recharge is determinant for the sustainable groundwater management. The recharge can be estimated using different methods according to the characteristics of the studied area, the spatial and temporal scales and data ...
Flora Würth Simon   +3 more
doaj   +1 more source

Avaliação da hidratação de pastas cimentícias com elevados teores de adições minerais [PDF]

open access: yes, 2012
O uso de adições minerais é uma prática comum na produção de materiais cimentícios. No entanto, a possibilidade de substituir elevados teores de cimento Portland por adições minerais em betões torna pertinente e necessário o estudo da interacção química ...
Anjos, Marcos A. S.   +3 more
core  

The Stability of Manganese Oxides Under Laser Irradiation During Raman Analyses: II. Layer Structures

open access: yesJournal of Raman Spectroscopy, Volume 56, Issue 10, Page 1072-1088, October 2025.
Manganese oxides are important geomaterials with diverse technological applications. Here, we investigate the behaviour of the most common Mn oxides with layer structures under irradiation by a 532‐nm laser, with intensity ranging from 23 µW/µm2 to 36.8 mW/µm2.
Simone Bernardini   +4 more
wiley   +1 more source

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