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	Provedor de dados Chilean J. Agric. Res. (1) BABT (1) Autor Balocchi,Oscar (1) Borges,Jaqueline Aparecida Ribaski (1) Dec,Dorota (1) Dörner,José (1) Facin,Paulo Cesar (1) Heck,Richard John (1) Melo,Mário Sérgio de (1) Pires,Luiz Fernando (1) Mais... Palavra-chave Porous system (2) 3D analysis (1) Andisol (1) Image analysis (1) Mechanical strength (1) Micromorphology (1) Penetration resistance (1) Sandstone structure (1) Water content (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Journal article (1) Ano 2019 (1) 2011 (1) País Brazil (1) Chile (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última X-ray Microtomography to Quantify Morphological Sandstones Properties BABT Pires,Luiz Fernando; Melo,Mário Sérgio de; Borges,Jaqueline Aparecida Ribaski; Heck,Richard John; Facin,Paulo Cesar. Abstract The sandstones of the Furnas Formation in the State of Paraná, south of Brazil, are located in regions with great importance due to the natural heritage found in the rocky forms and associated flora and fauna. This paper presents a detailed analysis of the internal structure of diverse sandstones of the Furnas Formation. X-ray microtomography allowed 3D characterization of the number, pore size and shape distributions of the sandstones. Images with voxel size of 603 µm3 were utilized to evaluate the sandstone’s macroporosity. The main results obtained indicate that higher macroporosities were observed in coarser and some types of silicified sandstones. In general, fine sandstones were characterized by the largest number of pores. As a general... Tipo: Info:eu-repo/semantics/article Palavras-chave: Image analysis; Porous system; Sandstone structure; 3D analysis; Micromorphology. Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132019000100605 Temporal and spatial variability of structure dependent properties of a volcanic ash soil under pasture in southern Chile Chilean J. Agric. Res. Dec,Dorota; Dörner,José; Balocchi,Oscar. Prairies are a main source for livestock feeding in southern Chile. The aim of this research was to define how grazing events and natural wetting and drying cycles (WD) affect the spatial and temporal variability of the soil’s structural properties. The investigation was conducted in a Duric Hapludand, Valdivia Series. Penetration resistance (PR) and volumetric water content (WC), measured in situ, were used to prepare maps which show i) temporal (1383 to 3047 kPa for 46 to 16% WC) and spatial changes, and ii) grazing events as an important factor influencing spatial changes in PR (differences of 3421 kPa between max and min values). Grazing and WD cycles induced changes in the soil’s mechanical stability and pore functions, which indicate that... Tipo: Journal article Palavras-chave: Penetration resistance; Water content; Mechanical strength; Porous system; Andisol. Ano: 2011 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392011000200015 Registros recuperados: 2 Primeira ... 1 ... Última

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