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Sergio Valentinotti

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Publications associées (11)

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Asymptotic Rejection of Nonvanishing Disturbances Despite Plant-Model Mismatch

Dominique Bonvin, Philippe Müllhaupt, Sergio Valentinotti

A direct adaptive control methodology for the rejection of unmeasured non-vanishing disturbances is proposed. The approach uses the framework of polynomial RST controllers and relies on the internal model principle with additional degrees of freedom provid ...

Wiley-Blackwell2012

Real-time update of calibration model for better monitoring of batch processes using spectroscopy

Urs von Stockar, Ian William Marison, Sergio Valentinotti, Henri Kornmann

In order to reduce the large calibration matrix usually required for calibrating multiwavelength optical sensors, a simple algorithm based on the addn. in process of new stds. is proposed. A small calibration model, based on 14 stds., is periodically updat ...

2004

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A partial least-squares calibration model, relating mid-IR spectral features with fructose, ethanol, acetate, gluconacetan, phosphate and ammonium concns. has been designed to monitor and control cultivations of Gluconacetobacter xylinus and prodn. of gluc ...

2004

Control of yeast fed-batch process through regulation of extracellular ethanol concentration

Urs von Stockar, Sergio Valentinotti, Christopher Cannizzaro

At high growth rates, the biomass yield of baker's yeast (Saccharomyces cerevisiae) decreases due to the prodn. of ethanol. For this reason, it is std. industrial practice to use a fed-batch process whereby the specific growth rate, m, is fixed at a level ...

Springer-Verlag2004

On-line biomass monitoring with scanning dielectric spectroscopy

Urs von Stockar, Ian William Marison, Sergio Valentinotti, Christopher Cannizzaro

Accurate online monitoring of biomass is an enduring problem. Of the various methods available, one of the more satisfactory is with dielec. spectroscopy (often referred to as capacitance monitoring). However, as this technique measures total -biovolume', ...

2003

Experimental versus simulated calibration mdels for in situ FTIR monitoring of bioprocesses

Urs von Stockar, Sergio Valentinotti, Martin Rhiel, Henri Kornmann

Over the past decade the interest for bioprocess monitoring using non-invasive IR spectroscopic sensors has increased considerably. This is mainly due to their rapid simultaneous multi-analyte detn. ability, in-situ sterilizability, and low need for mainte ...

2003

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A review, with refs. This contribution analyzes the position of biochem. engineering in general and bioprocess engineering particularly in the force fields between fundamental science and applications, and between academia and industry. By using culture te ...

2003

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Bacterial exopolysaccharides (EPS) have unique rheol. properties due to their high purity and regular structure. Thus, the food industry frequently uses EPS as thickening, gelling or stabilizing agents. The strain Gluconacetobacter xylinus I 2281 is capabl ...

2003

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Spectroscopic monitoring techniques have many advantages for bioprocess monitoring and control, including simultaneous multi-analyte detns., in-situ sterilizability, and low maintenance during operation. This study discusses the combined application of flu ...

2001

Optimal Control of Fed-Batch Fermenters

Dominique Bonvin, Urs von Stockar, Sergio Valentinotti, Christopher Cannizzaro, Martin Rhiel

Optimal control of fed-batch fermenters S. Valentinotti† C. Cannizzaro‡ M.Rhiel‡ U. Holmberg† U. von Stockar‡ D. Bonvin† †Institut d’Automatique, EPFL, 1015 Lausanne, Switzerland ‡Institut de Genie Chimique, EPFL, 1015 Lausanne, Switzerland Fermentors are ...

2000