Encontrados 6 documentos, a visualizar página 1 de 1
Optimal experimental design for estimating the kinetic parameters of processes ...
Cunha, Luís M; Oliveira, Fernanda A. R.The optimum experimental design for systems following the ®rst-order Arrhenius model under linearly increasing temperature pro®les was studied by determining the sampling conditions that lead to a minimum con®dence region of the model parameters. It was found that experiments should be started at the lowest possible temperature and, for each initial temperature, there is an optimal heating rate. This heating ra...
Effect of milk fat and total solids concentration on the kinetics of moisture u...
Machado, M. Fátima; Oliveira, Fernanda A. R.; Cunha, Luís M.When immersed in milk, breakfast cereal easily take up moisture, lose their brittle texture and become soggy. Earlier comparative analysis of the moisture sorption by breakfast cereal immersed in water and milk indicated that milk solids might play an important role on the sorption kinetics. In this work, the moisture uptake by ready-to-eat corn breakfast cereal immersed in milk solutions, reconstituted from wh...
Application of D-optimal design for determination of the influence of water con...
Frias, Jesus M.; Oliveira, Jorge C.; Cunha, Luís M.The kinetics of thermal degradation of ascorbic acid was studied in a Maltodextrin matrix at different temperatures between 7.5 and 140°C. Isothermal experiments were performed with samples earlier equilibrated in environments of known a, at 4°C enclosed in hermetically sealed vials, with water contents (w) between 0.17 and 168g water/g solids. Sampling times were selected according to an optimal experimental d...
Optimal experimental design for estimating the kinetic parameters of processes ...
Cunha, Luís M; Oliveira, Fernanda A. R.; Oliveira, Jorge C.The optimum experimental design for determining the kinetic parameters of the model resulting from the Weibull probability density junction was studied, by defining the sampling conditions that lead to a minimum confidence region of the estimates, for a number of observations equal to the number of parameters. It was found that for one single isothermal experiment the optimum sampling times corresponded always ...
Optimal experimental design for estimating the kinetic parameters of the Bigelo...
Cunha, Luís M.; Oliveira, Fernanda A. R.; Brandão, Teresa R.S.; Oliveira, Jorge C.The optimum experimental design for systems following the Bigelow model was studied by determining the sampling conditions that lead to a minimum confidence region for a number of observations equal to the number of parameters. For isothermal conditions, it was found that this corresponds to the sampling times when the fractional concentration of the decaying factor (ηi) is equal to e−1 and that the experiments...
Influence of large solid spherical particles on the residence time distribution...
Baptista, Paulo N.; Oliveira, Fernanda A. R.; Cunha, Luís M.; Oliveira, Jorge C.The effect of large solid particles on the residence time distribution of the fluid in two-phase flow was studied in a pilot scale continuous tubular system. The residence time distribution was characterized with four parameters: the normalized minimum and mean residence time, the normalized standard deviation and the skewness. The effect of particle concentration (1 and 3%) and particle diameter (diameters app...
| Financiadores do RCAAP | |||||||
|
|
|
|
|
|
||