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Gap filling in time series: A new methodology applying spectral analysis and system identification. Repositório Alice
BULHOES, J. S.; ASSIS, A. O.; MARTINS, C. L.; FURRIEL, G. P.; SILVA, B. C. R.; RODRIGUES, L.; REIS, M. R. C.; CALHEIROS, D. F.; OLIVEIRA, M. D. de; CALIXTO, W. P..
The presence of gaps in time series makes the data analysis process difficult. Although there are several methods for filling such gaps, they do not present satisfactory results as the gap widens. The proposal of this paper is to present a new methodology that uses techniques of extraction of characteristics and identification of systems to fill the missing data. The proposed methodology was applied in time series of physical and chemical variables related to the water quality and behavior of the Paraguay River, and the effectiveness of the internal data forecast was proven.
Tipo: Artigo em anais de congresso (ALICE) Palavras-chave: Método de Análise; Spectral Analysis.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1084473
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Geoelectric method applied in correlation between physical characteristics and electrical properties of the soil. Repositório Alice
SILVA FILHO, A. M.; SILVA, C. L. B.; OLIVEIRA, M. A. A.; PIRES, T. G.; ALVES, A. J.; CALIXTO, W. P.; NARCISO, M. G..
This paper presents the study of the relationship between electrical properties and physical characteristics of the soil. Measures of apparent electrical resistivity of the soil were made for different types of soil, varying moisture content gradually while maintaining a constant compaction, and then varying the compaction and relating it to a constant humidity. Development of a correlation surface is proposed in order to identify granulometry of the soil from moisture and compaction measurements. For the study of spatial variability, two areas were chosen to allow the change of moisture content and compaction in order to verify the measurement capacity of apparent electrical resistivity of the soil as methodology to identify change in soil dynamics....
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Apparent electrical resistivity; Geoelectric prospecting; Water content; Soil compaction; Soil properties.
Ano: 2017 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1078731
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