Modeling Of Alcohol Fermentation In Brewing - Integrated Approch For Control Of Continuous Alcohol Fermentation
An integrated approach for the management of continuous beer fermentation with immobilized cells was developed. Experimental results for continuous fermentation were used for the development of dependencies for the calculation of real extract and ethanol at different degrees of fermentation and dilution rates. For this purpose, mathematical relationships describing the fermentation with high accuracy were used.
Modeling Of Alcohol Fermentation In Brewing - Some Practical Approaches
In the present work, a practical method for determination of the basic physicochemical parameters of beer real extract, alcohol and biomass concentration based on the amount of produced CO2 during the fermentation is investigated. The method was applied for determination of biomass concentration in immobilized preparations after its approbation with analytical data for beer fermentations with free cells. The kinetics parameters of the fermentation were determined with 3 of the most used kinetic models. The differences between beer fermentations with free and immobilized cells were investigated. The effect of yeasts immobilization on brewing process was defined.
A new method of near field analysis
The problem of the accurate determination of the total electromagnetic field produced by a current distribution on a circular disc type aperture is examined. For comparison of the near and Fresnel region solutions, an exact Maxwellian integral is used as the starting point. Aperture and space coordinates are separated by the use of Bessel function addition theorems, allowing the field to be expressed as a sum of terms containing radial and angular integrals. The radial integrals involve only the disc (aperture) distribution and coordinates while the angular integrals involve only the elevation angle. The distance from origin appears implicitly in the series coefficients. These integrals are suitable for high speed computations and have been evaluated for a number of cases. The results are compared with the small angle and general Fresnel formula values for various observation angles, distances from the aperture, and aperture distributions.