A robust multi-model predictive controller for distributed parameter systems

12 páginas, 6 figurasIn this work a robust nonlinear model predictive controller for nonlinear convection–diffusion-reaction systems is presented. The controller makes use of a collection of reduced order approximations of the plant (models) reconstructed on-line by projection methods on proper orthogonal decomposition (POD) basis functions. The model selection and model update step is based on a sufficient condition that determines the maximum allowable process-model mismatch to guarantee stable control performance despite process uncertainty and disturbances. Proofs on the existence of a sequence of feasible approximations and control stability are given. Since plant approximations are built on-line based on actual measurements, the proposed controller can be interpreted as a multi-model nonlinear predictive control (MMPC). The performance of the MMPC strategy is illustrated by simulation experiments on a problem that involves reactant concentration control of a tubular reactor with recycle.This work has been also partially founded by the Spanish Ministry of Science and Innovation (SMART-QC, AGL2008-05267-C03-01), the FP7 CAFE project (KBBE-2007-1-212754), the Project PTDC/EQU-ESI/73458/2006 from the Portuguese Foundation for Science and Technology and PI grant 07/IN.1/I1838 by Science Foundation Ireland. Also, the authors acknowledge financial support received by a collaborative grant GRICES-CSIC.Peer reviewe

A robust multi-model predictive controller for distributed parameter systems

12 páginas, 6 figurasIn this work a robust nonlinear model predictive controller for nonlinear convection–diffusion-reaction systems is presented. The controller makes use of a collection of reduced order approximations of the plant (models) reconstructed on-line by projection methods on proper orthogonal decomposition (POD) basis functions. The model selection and model update step is based on a sufficient condition that determines the maximum allowable process-model mismatch to guarantee stable control performance despite process uncertainty and disturbances. Proofs on the existence of a sequence of feasible approximations and control stability are given. Since plant approximations are built on-line based on actual measurements, the proposed controller can be interpreted as a multi-model nonlinear predictive control (MMPC). The performance of the MMPC strategy is illustrated by simulation experiments on a problem that involves reactant concentration control of a tubular reactor with recycle.This work has been also partially founded by the Spanish Ministry of Science and Innovation (SMART-QC, AGL2008-05267-C03-01), the FP7 CAFE project (KBBE-2007-1-212754), the Project PTDC/EQU-ESI/73458/2006 from the Portuguese Foundation for Science and Technology and PI grant 07/IN.1/I1838 by Science Foundation Ireland. Also, the authors acknowledge financial support received by a collaborative grant GRICES-CSIC.Peer reviewe

Towards predictive models in food engineering: Parameter estimation dos and don'ts

1 póster.-- 29th EFFoST International Conference, 10-12 November 2015, Athens, GreeceRigorous, physics based, modeling is at the core of computer aided food process engineering. Models often require the values of some, typically unknown, parameters (thermo-physical properties, kinetic constants, etc). Therefore, parameter estimation from experimental data is critical to achieve desired model predictive properties. Unfortunately, it must be admitted that often experiment design and modeling are fully separated tasks: experiments are not designed for the purpose of modeling and models are usually derived without paying especial attention to available experimental data or experimentation capabilities. When, at some point, the parameter estimation problem is put on the table, modelers use available experimental data to ``manually'' tune the unknown parameters. This results in inaccurate parameter estimates, usually experiment dependent, with the implications this has in model validation. This work takes a new look into the parameter estimation problem in food process modeling. First the common pitfalls in parameter estimation are described. Second we present the theoretical background and the numerical techniques to define a parameter estimation protocol to iteratively improve model predictive capabilities. This protocol includes: reduced order modeling, structural and practical identifiability analyses, data fitting with global optimization methods and optimal experimental design. And, to finish, we illustrate the performance of the proposed protocol with an example related to the thermal processing of packaged foods. The model was experimentally validated in the IIM-CSIC pilot plantThe authors acknowledge financial support from the EU (Project SPECTRAFISH), Spanish Ministry of Science and Innovation (Project ISFORQUALITY) and CSIC (Project CONTROLA)Peer reviewe

A model for the biochemical degradation of inosine monophosphate in hake (Merluccius merluccius)

7 páginas, 3 tablas, 3 figuras, 1 apéndiceATP-derived products are typically used as early indicators of fish quality loss during storage. In this work, we explore different biochemical routes that are potentially relevant in contributing to nucleotide degradation in hake (Merluccius merluccius). A major motivation of this study is to get more insight on the biochemical degradation mechanisms of nucleotide catabolites in hake muscle at fish storage and transport conditions. This requires the identification of its relevant pathways. To that purpose, different degradation routes proposed in the literature are considered and a mathematical model for the degradation process is derived. First order kinetics are assumed for all the reactions and temperature dependence is taken into account through the Arrhenius equation. Unknown model parameters, namely activation energies and pre-exponential Arrhenius coefficients, are estimated via fitting to experimental data. From the estimation results, relevant routes are identified. The kinetic study is performed on sterile fish juice to avoid coupling with microbial degradation mechanisms or possible interferences of the food matrix that might hide biochemical interactions. The proposed scheme adequately describes biochemical changes in nucleotide catabolites under variable temperature profiles. It also reveals a pathway which at least seems relevant for nucleotide degradation in hakeThe authors acknowledge financial support from the Spanish Ministry of Science and Innovation (Projects ISFORQUALITY AGL2012-39951-C02-01, PIE 201230E042 and RESISTANCE DPI2014-54085-JIN)Peer reviewe

La cueva de El Pindal (Pimiango, Ribadedeva, Asturias) : revisión de los materiales conservados en el Museo Arqueológico de Asturias

En este artículo se presentan los materiales arqueológicos conservados en el Museo Arqueológico de Asturias procedentes de la cueva de El Pindal y que se documentaron durante la intervención realizada en la cavidad por Francisco Jordá en 1954. En su mayor parte, el conjunto está constituido por restos arqueozoológicos, fundamentalmente conchas de moluscos marinos, aunque también macromamíferos y restos industriales líticos. Su estudio nos ha permitido concluir que existió una ocupación de la cueva durante el Mesolítico, que ha sido confirmada por una datación radiocarbónica. Sin embargo, no se puede descartar una ocupación anterior, posiblemente a finales del Paleolítico superior.The present paper shows the archaeological materials deposited in the Asturias Archaeology Museum from El Pindal cave, that where recovered by Francisco Jordá in 1954 excavations. These mainly consist ofarchaeozoological remains, mostly marine mollusc shells, although remains of large mammals and lithic industry have also been documented. The study concludes that the cave was occupied during the Mesolithic period, which has now been confirmed by a radiocarbon dating. However, a previous occupation, maybe in the late Upper Palaeolithic, cannot be ruled out

Utilización de la plataforma "Intact" para el diseño de materiales didácticos que faciliten la construcción significativa compartida del conocimiento desde la asignatura del practicum de magisterio y educación social

Intact es una plataforma virtual producto del Proyecto multilateral Comenius (Nº 527932-LLP-1-2012-1-DE-COMENIUS-CMP) en el que participaron algunos de los profesores implicados en el presente proyecto de innovación. La filosofía de esta plataforma virtual era crear un espacio que permitiera a los docentes compartir materiales al estilo web 2.0. Como formadores de formadores, queremos dar continuidad a esta filosofía de trabajo basada en la cooperación empezando desde la base, es decir, desde la asignatura Prácticum III del plan de formación de maestros y educadores sociales. La propuesta no se centra en el uso de esta plataforma, -que de hecho ha sido sustituida por la plataforma Moodle de la UCM al adaptarse esta mejor esta plataforma a nuestras necesidades docentes- , sino potenciar el diálogo y el aprendizaje cooperativo como base para un aprendizaje significativo y crítico, garantía de una buena formación profesionalizante. Esta filosofía de trabajo cooperativo se ha querido desarrollar en tres líneas de acción: entre los estudiantes de prácticas, futuros profesores, esperando que esta filosofía “arraigue” en ellos y continúen fomentándola en el desarrollo de su ejercicio profesional; entre los mentores de prácticas (profesores de aula en los centros), confiando que estos se contagien – si no son todavía defensores de este enfoque-; y entre los estudiantes propiamente dichos (los de los centros de prácticas). El desarrollo práctico se ha centrado en la realización de reuniones, presenciales y virtuales y en el diseño y participación en foros cooperativos

Ethnic diversity in children's television: the case of Sofía the First

Miriam E. Aguasanta-Regalado – Universidad de Valencia - 0000-0003-2917-4111Juana M. Encarnación Cruz – Universidad Autónoma de Santo Domingo - 0000-0001-7542-3524Flor B. Fortuna Terrero – Universidad Autónoma de Santo Domingo - 0000-0002-7201-4749Ángel San Martín Alonso – Universidad de Valencia - 0000-0003-3565-4250Isabel M. Gallardo-Fernández – Universidad de Valencia - 0000-0001-7505-5469Recepción: 05.04.2022 | Aceptado: 18.04.2022Correspondencia a través de ORCID: Miriam E. Aguasanta-Regalado - 0000-0003-2917-4111Los medios de comunicación se han convertido en prescriptores sociales. Por ello es cada vez más importante examinar cómo estos dibujan y describen el contexto social, así como representan al otro. Problema de estudio: ¿cómo se construye la representación de la diversidad étnica en una serie infantil de televisión? Se hace uso del Análisis Crítico del Discurso como herramienta que permite examinar críticamente la imagen de la diversidad en el relato infantil. A la luz de la revisión se observa una mejora en la parte cuantitativa, presentando un mayor número de personajes de color. Se estima que la educación mediática es la estrategia idónea para desarrollar la capacidad de análisis crítico de los contenidos audiovisuales. Abstract: The media have become social prescribers. For this reason, it is increasingly important to examine how they draw and describe the social context, as well as how they represent the other. It is questioned how the representation of ethnic diversity is constructed in the television series? Critical Discourse Analysis is used as a tool that allows us to critically examine the image of diversity in children's stories. In light of the revision, an improvement is observed in the quantitative part, presenting a greater number of colored characters. It is estimated that media education would be the ideal strategy to develop the capacity for critical analysis of audiovisual content.Financiación: Ministerio de Educación Superior, Ciencia y Tecnología de la República Dominicana. Estudio de investigación asociado a un proyecto doctoral sobre la diversidad cultural en la televisión infantil

Diversidad étnica en la televisión infantil: el caso de La Princesa Sofía

The media have become social prescribers. For this reason, it is increasingly important to examine how they draw and describe the social context, as well as how they represent the other. It is questioned how the representation of ethnic diversity is constructed in the television series? Critical Discourse Analysis is used as a tool that allows us to critically examine the image of diversity in children's stories. In light of the revision, an improvement is observed in the quantitative part, presenting a greater number of colored characters. It is estimated that media education would be the ideal strategy to develop the capacity for critical analysis of audiovisual content. Los medios de comunicación se han convertido en prescriptores sociales. Por ello es cada vez más importante examinar cómo estos dibujan y describen el contexto social, así como representan al otro. Problema de estudio: ¿cómo se construye la representación de la diversidad étnica en una serie infantil de televisión? Se hace uso del Análisis Crítico del Discurso como herramienta que permite examinar críticamente la imagen de la diversidad en el relato infantil. A la luz de la revisión se observa una mejora en la parte cuantitativa, presentando un mayor número de personajes de color. Se estima que la educación mediática es la estrategia idónea para desarrollar la capacidad de análisis crítico de los contenidos audiovisuales