Volterra Model Based Predictive Control, application to a Pem Fue Cell

14th Nordic Process Control Workshop - Espoo, Finland Duration: 23 Aug 2007 → 25 Aug 2007This paper presents a non linear model predictive controller for a PEM fuel cell for which the starvation control is the main objective. A second order Volterra model for control is obtained using input/output data for which the power supplied by the fuel cell is considered as a measurable disturbance. The controller developed allows to solve the nonlinear objective function in a way that it can be actually implemented in fast systems like Fuel cells. The use of a nonlinear controller is justified while comparing the outcome obtained with a linear controller of the same class

Desarrollo y aplicaciones de un modelo de crecimiento para plantaciones de Pinus radiata D. Don en El Bierzo (León)

A dynamic growth model for Pinus radiata D. Don plantations in El Bierzo (Spain) was developed with data from two inventories of permanent plots, of between 7 and 36 years old, established by the University of León. In this model, stand conditions at any point in time are defined by three state variables (stand basal area, number of trees per hectare and dominant height).Themodel includes three transition functions derived by the generalized algebraic difference approach to enable projection of the state variables at any particular time. Once they are known, the number of trees in each diameter class is estimated with a distribution function, by recovery of the parameters of theWeibull function by use of the moments method. Finally, a generalized height-diameter function and a taper function allow estimation of total or merchantable stand volume. The model provides satisfactory predictions for a time interval of three years. Simulation of the growth of four stands under two silvicultural regimes and two different sites confirm that the estimates provided by the overall model adequately represent the effects of both stand density and site quality. Other applications for the model are analysed and discussed.Se ha desarrollado un modelo dinámico de crecimiento para plantaciones de Pinus radiata D. Don en El Bierzo (León) a partir de datos de dos inventarios de parcelas permanentes, de entre 7 y 36 años de edad, establecidas por la Universidad de León. En este modelo, las condiciones del rodal en un instante dado están definidas por tres variables de estado (área basimétrica, número de pies por hectárea y altura dominante). El modelo incluye tres funciones de transición obtenidas mediante la metodología de ecuaciones en diferencias algebraicas generalizadas que permite la proyección de las variables de estado a un determinado instante en el tiempo. Una vez conocidas las variables de estado, una función de distribución estima el número de pies en cada clase diamétrica mediante la metodología de recuperación de los parámetros de la función deWeibull usando el método de los momentos. Finalmente, una función de altura-diámetro generalizada y una función de perfil de tronco permiten la estimación del volumen total o comercial del rodal. El modelo proporciona predicciones satisfactorias para un intervalo de proyección de tres años. La simulación del crecimiento de cuatro rodales bajo dos regímenes selvícolas distintos y dos calidades de estación diferentes corrobora que las estimaciones proporcionadas por el modelo global representan adecuadamente los efectos de la densidad de la masa y la calidad de la estación. Finalmente se analizan y discuten otras aplicaciones del modelo elaborado

Structural insight into the TRIAP1/PRELI-like domain family of mitochondrial phospholipid transfer complexes

The composition of the mitochondrial membrane is important for its architecture and proper function. Mitochondria depend on a tightly regulated supply of phospholipid via intra-mitochondrial synthesis and by direct import from the endoplasmic reticulum. The Ups1/PRELI-like family together with its mitochondrial chaperones (TRIAP1/Mdm35) represent a unique heterodimeric lipid transfer system that is evolutionary conserved from yeast to man. Work presented here provides new atomic resolution insight into the function of a human member of this system. Crystal structures of free TRIAP1 and the TRIAP1–SLMO1 complex reveal how the PRELI domain is chaperoned during import into the intermembrane mitochondrial space. The structural resemblance of PRELI-like domain of SLMO1 with that of mammalian phoshatidylinositol transfer proteins (PITPs) suggest that they share similar lipid transfer mechanisms, in which access to a buried phospholipid-binding cavity is regulated by conformationally adaptable loops

Record of Cletocamptus sinaloensis (COPEPODA: HARPACTICOIDA: CANTHOCAMPTIDAE) from the caribbean coast of Colombia

Objetivos: Reportar el primer registro de C. sinaloensis para Colombia. Alcance. Presentar una breve descripción de este material para apoyar la identificación del nuevo material encontrado. Metodología: Se tomaron muestras de agua en Ciénaga Grande de Santa Marta Colombia utilizando un balde de 25 L. Las muestras se filtraron con una red estándar de zooplancton (malla con diámetro de poro de 45 μm) y se fijaron y conservaron en etanol al 70%. Los copépodos harpacticoides se separaron con un pincel. Las muestras disecadas y los apéndices se montaron en glicerina. Los apéndices disecados se fotografiaron usando una cámara digital Kodak Easy Share C140 adaptada a un microscopio compuesto con un aumento de 1000X. Resultados principales: Cletocamptus sinaloensis parece estar estrechamente relacionado con C. levis Gómez 2005, conocido en Brasil. La cercanía de estas especies se asumió en función de la forma general y el número de setas del palpo mandibular (un segmentado con tres setas), P2-P4 EXP3 y ENP2 con 5-5-4 y 3-3-2 elementos respectivamente, relación longitud: anchura de la rama caudal, y ornamentación del opérculo anal con dos filas de espínulas fuertes. Sin embargo, pueden separarse por 1) el complemento de armadura del exopodo antenal, 2) la longitud del lóbulo exopodal de la P5 de la hembra, 3) la longitud relativa del P3ENP, 4) el número de setas en la P6 de la hembra. Conclusiones: El espécimen de Colombia tiene las características diagnósticas de C. sinaloensis como se describió originalmente, pero muestra diferencias sutiles en la longitud de P1 ENP, en la forma del receptáculo seminal y en la longitud relativa de P6.Objectives: to report the first record of C. sinaloensis for Colombia. Scope: to present a brief description of this material in order to support the identification of the newly found material. Methodology: Water samples were taken at Ciénaga Grande de Santa Marta Colombia using a 25 L bucket. Samples were filtered with a standard zooplankton net (45 μm mesh) and fixed and preserved in 70% ethanol. Harpacticoid copepods were separated with a brush. Dissected specimens and appendages were mounted in glycerine. The dissected appendages were photographed using a Kodak Easy Share C140 digital camera adapted to a compound microscope at a magnification of 1000X. Main results: Cletocamptus sinaloensis seems to be closely related to C. levis Gómez 2005, known from Brazil. The closeness of these species was assumed based on the general shape and number of setae of the mandibular palp (one-segmented with three setae), P2-P4 EXP3 and ENP2 with 5-5-4 and 3-3-2 elements respectively, length: width ratio of the caudal rami, and ornamentation of the anal operculum with two rows of strong spinules. Nevertheless, they can be separated by 1) the armature complement of the antennal exopod, 2) length of the exopodal lobe of the female P5, 3) relative length of the P3ENP, 4) number of setae on the female P6. Conclusions: The specimen from Colombia bears the diagnostic features of C. sinaloensis as originally described, but shows subtle differences in the length of P1ENP, shape of seminal receptacle and relative length of P6

Modelado y control de un horno de yeso rotativo y continuo

XXI Jornadas de Automática 2000. 18/09/2000. SevillaEn este trabajo se describe el proceso de modelado que define el comportamiento de un horno de yeso rotativo y continuo. También se detalla la estrategia de control que mejor se adapta al sistema y se presentan los resultados obtenidos en las simulaciones.Ministerio de Ciencia y Tecnología IFD97-0383

Analyzing Modern Biomolecules: The Revolution of Nucleic-Acid Sequencing-Review

Recent developments have revolutionized the study of biomolecules. Among them are molecular markers, amplification and sequencing of nucleic acids. The latter is classified into three generations. The first allows to sequence small DNA fragments. The second one increases throughput, reducing turnaround and pricing, and is therefore more convenient to sequence full genomes and transcriptomes. The third generation is currently pushing technology to its limits, being able to sequence single molecules, without previous amplification, which was previously impossible. Besides, this represents a new revolution, allowing researchers to directly sequence RNA without previous retrotranscription. These technologies are having a significant impact on different areas, such as medicine, agronomy, ecology and biotechnology. Additionally, the study of biomolecules is revealing interesting evolutionary information. That includes deciphering what makes us human, including phenomena like non-coding RNA expansion. All this is redefining the concept of gene and transcript. Basic analyses and applications are now facilitated with new genome editing tools, such as CRISPR. All these developments, in general, and nucleic-acid sequencing, in particular, are opening a new exciting era of biomolecule analyses and applications, including personalized medicine, and diagnosis and prevention of diseases for humans and other animals

Balanço do monitoramento orbital das queimadas no Brasil em 2001.

Resumo dos resultados obtidos ao longo do ano de 2001, sobre o monitoramento das queimadas no Brasil, enviado para a campanha de controle e redução das queimadas na agricultura brasileira, realizada pelo Ministério da Agricultura, Pecuária e Abastecimento (MAPA). A campanha pretende estimular o uso de alternativas tecnológicas na agricultura que substituam as queimadas, em especial nas regiões Norte e Centro-Oeste, uma das áreas mais atingidas por essa prática. A dinâmica das queimadas revelou um crescimento significativo em 2001 com relação ao ano anterior e várias surpresas, tanto na sua repartição espacial, detalhadas neste trabalho.bitstream/CNPM/831/1/cot6_qmda_bal01.pd

Avoiding Interference in Planar Arrays through the Use of Artificial Neural Networks

[Abstract] This article implements an artificial neural network to find, through computer simulation, the excitations of a square planar array. The array is composed of 52 uniformly spaced subarrays, and has a quasi- in its radiation diagram. This simulation model includes the reduction of any signal interference in the shaped radiating zone after its position has been determined

Biotrickling filter modeling for styrene abatement. Part 2: Simulating a two-phase partitioning bioreactor

Peer ReviewedPostprint (author's final draft