Densities, speeds of sound, and refractive indices of the binary nonane + triethylene glycol dimethyl ether (2,5,8,11-tetraoxadodecane or triglyme or TODD) have been measured at the temperatures 288.15 K, 293.15 K, 298.15 K, and 308.15 K and atmospheric pressure, over the entire composition range. Using these data, excess molar volumes and increments in speed of sound and refractive index have been calculated. Excess quantities and increments have been fitted to a variable-degree polynomial equation. The correlation parameters together with the standard deviations between the experimental and calculated values were derived.
Visou-se, neste trabalho, avaliar as propriedades físico-hídricas do solo sob diferentes sistemas de manejo, em comparação com o Cerrado nativo, em Santo Antônio de Goiás, GO, em áreas cultivadas desde o ano de 1993. As propriedades físico-hídricas foram avaliadas nas profundidades de 0-0,10 e 0,10-0,20 m do solo submetido aos sistemas de manejo: S1 (soja/feijão/arroz/milheto/feijão), S2 (soja/milheto/milho), S3 (milho + pastagem de braquiária - integração-lavoura-pecuária) e S4 (cerrado nativo). Utilizou-se, para comparar os resultados obtidos nos diversos sistemas de manejo do solo, o intervalo de confiança com nível de probabilidade de 5%. A área com pastagem de braquiária sob pastejo animal promoveu compactação do solo na camada superficial, verificada pela redução da macroporosidade, aumento da microporosidade e da densidade do solo.
Speed of sound, density, and isentropic compressibility have been measured over the entire composition
range at atmospheric pressure for the system methanol + tetraethylene glycol dimethyl ether (2,5,8,11,14-pentaoxapentadecane) at five temperatures from 293.15 K to 333.15 K. The values of these
magnitudes were fitted by a polynomial equation in mole fraction. The values of the densities and isentropic
compressibilities have been used to calculate excess molar volumes and isentropic compressibility
increments, respectively, for the mixing process. These results have been fitted to a variable-degree
polynomial equation to obtain the correlation parameters together with the root-mean-square deviations
between the experimental and calculated values.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.