Active disturbance rejection control of temperature of thermoelectric module

[EN] This article presents an active disturbance rejection approach for the control of the temperature in the cold face of a thermoelectric module fed by a type buck DC-DC converter. The dynamics of the module is seen as a disturbance of an unknown nature and varying in time, of the output voltage of the converter. Said disturbance is estimated by means of a generalized proportional integral type observer, which in combination with the controller allows to regulate the temperature on the cold face of the thermoelectric module to a desired constant value. The designed observer simultaneously estimates the step-down converter output voltage and the exogenous disturbance in an on-line cancellation scheme, known as active disturbance rejection control. For comparison purposes, a proportional integral type controller and a linear quadratic regulator are designed, based on an approximate linearization of the combined dynamic model of the buck converter and the module. The experimental results were obtained by means of an experimental prototype and allow to show the effectiveness of proposed control technique for this type of thermoelectric devices.[ES] Este artículo presenta una aproximación mediante rechazo activo de perturbaciones para controlar, de manera indirecta, la temperatura de la cara fría de un módulo termoeléctrico alimentado por un convertidor CD-CD tipo reductor. La dinámica del módulo, es vista como una perturbación de naturaleza desconocida y variante en el tiempo, del voltaje de salida del convertidor. Dicha perturbación es estimada mediante un observador de tipo proporcional integral generalizado, el cual en combinación con el controlador permite regular la temperatura en la cara fría del módulo termoeléctrico a un valor constante deseado. El observador diseñado estima de manera simultánea el voltaje de salida del convertidor reductor y la perturbación exógena en un esquema de cancelación en línea, conocido como control mediante rechazo activo de perturbaciones. Para propósitos de comparación, se diseñan un controlador de tipo proporcional integral y un regulador cuadrático lineal, sobre la base de una linealización aproximada del modelo dinámico combinado del convertidor reductor y del módulo. Los resultados  experimentales que se obtuvieron mediante un prototipo experimental, permiten mostrar la efectividad de la técnica de control propuesta para este tipo de dispositivos termoeléctricos.Este trabajo ha sido realizado gracias al apoyo de la Universidad Tecnológica de la Mixteca.Barahona-Avalos, JL.; Juárez-Abad, JA.; Galván-Cruz, GS.; Linares-Flores, J. (2021). Control mediante rechazo activo de perturbaciones de la temperatura de un módulo termoeléctrico. 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A Phase I/II Clinical Trial to evaluate the efficacy of baricitinib to prevent respiratory insufficiency progression in onco-hematological patients affected with COVID19: a structured summary of a study protocol for a randomised controlled trial

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E-Debitum: managing software energy debt

35th IEEE/ACM International Conference on Automated Software Engineering Workshops (ASEW ’20) - International Workshop on Sustainable Software Engineering (SUSTAIN-SE)This paper extends previous work on the concept of a new software energy metric: Energy Debt. This metric is a reflection on the implied cost, in terms of energy consumption over time, of choosing an energy flawed software implementation over a more robust and efficient, yet time consuming, approach. This paper presents the implementation a SonarQube tool called E-Debitum which calculates the energy debt of Android applications throughout their versions. This plugin uses a robust, well defined, and extendable smell catalogue based on current green software literature, with each smell defining the potential energy savings. To conclude, an experimental validation of E-Debitum was executed on 3 popular Android applications with various releases, showing how their energy debt fluctuated throughout releases.This work is financed by National Funds through the Portuguese funding agency, FCT -Fundação para a Ciência e a Tecnologia within project UIDB/50014/2020

Entrepreneurial Orientation and the Family Firm: Mapping the Field and Tracing a Path for Future Research

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The Sensitivity of HAWC to High-Mass Dark Matter Annihilations

The High Altitude Water Cherenkov (HAWC) observatory is a wide field-of-view detector sensitive to gamma rays of 100 GeV to a few hundred TeV. Located in central Mexico at 19 degrees North latitude and 4100 m above sea level, HAWC will observe gamma rays and cosmic rays with an array of water Cherenkov detectors. The full HAWC array is scheduled to be operational in Spring 2015. In this paper, we study the HAWC sensitivity to the gamma-ray signatures of high-mass (multi- TeV) dark matter annihilation. The HAWC observatory will be sensitive to diverse searches for dark matter annihilation, including annihilation from extended dark matter sources, the diffuse gamma-ray emission from dark matter annihilation, and gamma-ray emission from non-luminous dark matter subhalos. Here we consider the HAWC sensitivity to a subset of these sources, including dwarf galaxies, the M31 galaxy, the Virgo cluster, and the Galactic center. We simulate the HAWC response to gamma rays from these sources in several well-motivated dark matter annihilation channels. If no gamma-ray excess is observed, we show the limits HAWC can place on the dark matter cross-section from these sources. In particular, in the case of dark matter annihilation into gauge bosons, HAWC will be able to detect a narrow range of dark matter masses to cross-sections below thermal. HAWC should also be sensitive to non-thermal cross-sections for masses up to nearly 1000 TeV. The constraints placed by HAWC on the dark matter cross-section from known sources should be competitive with current limits in the mass range where HAWC has similar sensitivity. HAWC can additionally explore higher dark matter masses than are currently constrained.Comment: 15 pages, 4 figures, version to be published in PR

VAMOS: a Pathfinder for the HAWC Gamma-Ray Observatory

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Distinct expression patterns of the E3 ligase SIAH-1 and its partner Kid/KIF22 in normal tissues and in the breast tumoral processes

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Measurement of the t t-bar production cross section in the dilepton channel in pp collisions at sqrt(s) = 7 TeV

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Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV

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Combined search for the quarks of a sequential fourth generation

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