Kinetic model identification and parameters estimation from TGA experiments

The presented work is a part of an ongoing research effort on the development of a general methodology for the determination of kinetic models of solid thermal decomposition under pyrolysis conditions with thermogravimetric analysis (TGA) devices. The goal is to determine a simple and robust kinetic model for a given solid with the minimum of TGA experiments. From the latter point of view, this work can be seen as the optimal design of TGA experiments for pyrolysis kinetic modelling. In this paper, a general procedure is presented and more precise results are given about the influence of the sensitivity matrix on the estimation of the kinetic parameters and about the important influence of the specific TGA runs used for parameter estimation on the precision of the fitted parameters. The first results are shown for simulated applications; in the final part, the presented results concern cellulose pyrolysis in a Setaram TGA device

Kinetic parameter estimation from TGA: Optimal design of TGA experiments

This work presents a general methodology to determine kinetic models of solid thermal decomposition with thermogravimetric analysis (TGA) instruments. The goal is to determine a simple and robust kinetic model for a given solid with the minimum of TGA experiments. From this last point of view, this work can be seen as an attempt to find the optimal design of TGA experiments for kinetic modelling. Two computation tools were developed. The first is a nonlinear parameter estimation procedure for identifying parameters in nonlinear dynamical models. The second tool computes the thermogravimetric experiment (here, the programmed temperature profile applied to the thermobalance) required in order to identify the best kinetic parameters, i.e. parameters with a higher statistical reliability. The combination of the two tools can be integrated in an iterative approach generally called sequential strategy. The application concerns the thermal degradation of cardboard in a Setaram TGA instrument and the results that are presented demonstrate the improvements in the kinetic parameter estimation process

Poetas andaluces y los contemporáneos (notas para un paralelo entre la generación de 1927 y los contemporáneos)

Tomo II ; págs. 59-8

En vísperas de la Independencia, dos ilustrados ligados al Virreinato del Perú: Baltasar Jaime Martínez Compañón y Bujanda (1738-1797) y Juan Francisco de la Bodega y Quadra (1744-1794)

Este artículo compara brevemente la vida y obras de dos hombres ilustrados, ligados al Virreinato del Perú, que secundaron las directrices reformistas de Carlos III: el Obispo de Trujillo, D. Baltasar Jaime Martínez Compañón y Bujanda (1738-1797) y el marino y explorador del Noroeste de América, D. Juan Francisco de la Bodega y Quadra (1744-1794)