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Correcting Sea Surface Temperature Spurious Effects in Salinity Retrieved From Spaceborne L-Band Radiometer Measurements ArchiMer
Boutin, Jacqueline; Vergely, Jean-luc; Dinnat, Emmanuel P.; Waldteufel, Philippe; D'Amico, Francesco; Reul, Nicolas; Supply, Alexandre; Thouvenin-masson, Clovis.
Earlier studies have pointed out systematic differences between sea surface salinity retrieved from L-band radiometric measurements and measured in situ, which depend on sea surface temperature (SST). We investigate how to cope with these differences given existing physically based radiative transfer models. In order to study differences coming from seawater dielectric constant parametrization, we consider the model of Somaraju and Trumpf (2006) (ST) which is built on sound physical bases and close to a single relaxation term Debye equation. While ST model uses fewer empirically adjusted parameters than other dielectric constant models currently used in salinity retrievals, ST dielectric constants are found close to those obtained using the Meissner and...
Tipo: Text Palavras-chave: Dielectric constant; L-band microwave radiometry; Sea surface salinity (SSS)..
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00657/76943/78203.pdf
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Electrical properties of maize kernels contaminated with aflatoxin CIGR Journal
Muga, Francis Collins; Workneh, Tilahun Seyoum; Marenya, Moses.
The purpose of this study was to investigate the effect of aflatoxin contamination on the dielectric constant of maize kernels. A factorial experiment comprising of three levels of moisture content (13.3, 15.3, and 16.4%), three frequencies (25, 50, and 100 kHz), and nine levels of aflatoxin contamination (0, 1.5, 2.6, 10, 50, 100, 150, 172, and 230 μg/kg) was used. The maize kernels were poured into a custom-built sample holder comprising a shielded parallel plate capacitor. An ISO-TECH LCR-821 meter was used to measure the capacitance, from which the dielectric constant was computed. The results indicated that moisture content and frequency significantly (p ≤ 0.05) affected the dielectric constant. The dielectric constant increased with increase in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Food Engineering; Postharvest technology Aflatoxin; Capacitance; Dielectric constant; Maize kernels.
Ano: 2018 URL: http://www.cigrjournal.org/index.php/Ejounral/article/view/4582
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