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Development of a non-isothermal method for determination of diffusional parameters
Moreira, Lília A.; Oliveira, Fernanda A. R.; Silva, Teresa R.; Oliveira, Jorge C.A non-isothermal method for determination of diffusional parameters was developed. The dependence of diffusivity on temperature was described by an Arrhenius type equation, 'with the pre-exponential factor and the,activation energy as parameters. These parameters were obtained by optimization of the fit between experimental and theoretical values, using the Simplex method of minimization. Equilibrium conditions...
On the theoretical determination of optimal times for biomass production in bat...
Silva, Teresa R.; Malcata, F. XavierA model based on transient substrate and population balances coupled with Monod kinetics for growth has been formulated using several simplifying assumptions for batch cultures of cells which form biomass aggregates. The functional form of the analytical solution of this system of equations in its most generic aspect has been obtained and applied in the calculation of the time period corresponding to the maximu...
Prediction of pH Change in Processed Acidified Turnips
Moreira, Lília A.; Oliveira, Fernanda A. R.; Silva, Teresa R.The acetic acid uptake by turnips was studied during an acidification process in containers. The process was successfully described by a Fickian diffusion, using a correlation for the buffer effect. Diffusion coefficients (0.629 to 3.99 × 10-9 m2/sec) and partition coefficients (0.8 to 1.1) were obtained by optimization of the fit between experimental and theoretical values, using the simplex method. The partit...
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