Water concentration in solvent

To demonstrate the utility of a, plots of enzyme activity vs. contain similar shapes and optimal values for a variety of different solvents. - (However, for a given value, the activity for lipophilic solvent is higher than for polar solvent, as discussed above.) Inconsistent trends exist when enzyme activity is plotted against water concentration in solvent rather than In addition, a ,-activity profiles for enzyme preparations that differ only in matrix material have similar shapes and maxima. Exceptions to the commonality of fl ,-enzyme activity profiles include... 

The proposed model is a feed-forward GMDH-type network and has constructed using experimental data set from ref. (Goncalves et al., 2002). This data set is constituted of 25 points in four different concentrations of water in solvent In Table 6.1, the overall experimental compositions of the mixtures and in Table 6.2, experimental mass fractions of the components in alcohol and oil phase are shown. The data set is divided in two parts, 80% used as training and 20% used as testing data. Each point in training and test data is constituted of 13 values. The 4 mass fractions in overall compositions and water concentration in solvent are normalized and used as inputs of GMDH-type network (X, and other 8 values are used as desired outputs of network, 4 mass fractions in alcohol phase. .., Y ) and 4 mass fractions in oil phase (Z, ... 

In this work, we designed a GMDH model for diffeient water concentration in solvent from all point of data set. For a better comparison with NRTL and UNIQUAC models (Goncalves et al., 2002) that were presented for systems with different water concentration, one can design four GMDH models for systems with 5,8,12, and 18% aqueous ethanol. It is obvious that each GMDH model uses four inputs (X, that... 

---