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	Provedor de dados REA (2) Autor Cruvinel,Paulo E. (2) Balogun,Fatai A. (1) Beraldo,José M. G. (1) Scannavino Junior,Francisco de A. (1) Palavra-chave Agricultural automation (1) Compton tomography (1) Image processing (1) Macroporosity (1) Precision farming (1) Soil density and moisture (1) X-ray microtomography (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Info:eu-repo/semantics/other (1) Ano 2014 (1) 2006 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Application of x-ray computed tomography in the evaluation of soil porosity in soil management systems REA Beraldo,José M. G.; Scannavino Junior,Francisco de A.; Cruvinel,Paulo E.. The study aimed to evaluate a methodology to quantify the porosity of the soil using computed tomography in areas under no-tillage, conventional tillage and native forest. Three soil management systems were selected for the study: forest, conventional tillage and no-tillage. In each soil management system, undisturbed soil samples were collected in the surface layer (0.0 to 0.10 m). The tomographic images were obtained using a X-ray microtomography. After obtaining the images, they were processed, and a methodology was evaluated for image conversion into numerical values. The statistical method which provided the greatest accuracy was the percentile method. The methodology used to analyze the tomographic image allowed quantifying the porosity of the soil... Tipo: Info:eu-repo/semantics/other Palavras-chave: Precision farming; Image processing; X-ray microtomography; Macroporosity. Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162014000600012 Compton scattering tomography for agricultural measurements REA Cruvinel,Paulo E.; Balogun,Fatai A.. This paper presents a new approach in tomographic instrumentation for agriculture based on Compton scattering, which allows for the simultaneous measurements of density and moisture of soil samples. Compton tomography is a technique that can be used to obtain a spatial map of electronic density of samples. Quantitative results can be obtained by using a reconstruction algorithm that takes into account the absorption of incident and scattered radiation. Results show a coefficient of linear correlation better than 0.81, when comparison is made between soil density measurements based on this method and direct transmission tomography. For soil water contents, a coefficient of linear correlation better than 0.79 was found when compared with measurements... Tipo: Info:eu-repo/semantics/article Palavras-chave: Compton tomography; Soil density and moisture; Agricultural automation. Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162006000100017 Registros recuperados: 2 Primeira ... 1 ... Última

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