Biogas production from grape pomace: Thermodynamic model of the process and dynamic model of the power generation system

Recently, thermoelectric generators (TEGs) have emerged as a potential alternative for clean energy generation, due mainly to the technology innovation and the marked cost reduction of modules, as well as their distinctive advantages. In a TEG system, the electronic power conditioning system (PCS) plays a vital role in ensuring the effective power grid integration, since it is subject to requirements related not only to the variable thermal source itself but also to its effects on the grid operation. This paper proposes an enhanced structure of PCS for the grid integration of TEG arrays to maximize the energy capture from a variable heat source. The innovative topology employed consists of a Z-source inverter that allows the flexible, efficient and reliable generation of high quality electric power from the TEG array. A full detailed model is described and its control scheme is designed. The dynamic performance of the proposed systems is fully validated by computer simulation and experimental studies.Fil: Cáceres, Clara Ximena. Universidad Nacional de San Juan. Facultad de Ingeniería. Instituto de Energía Eléctrica; ArgentinaFil: Cáceres, R. E.. Universidad Nacional de San Juan. Facultad de Ingeniería. Instituto de Energía Eléctrica; ArgentinaFil: Hein, D.. Universitat Siegen; AlemaniaFil: Molina, Marcelo Gustavo. Universidad Nacional de San Juan. Facultad de Ingeniería. Instituto de Energía Eléctrica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - San Juan; ArgentinaFil: Pia, J .M.. Universidad Nacional de San Juan. Facultad de Ingeniería; Argentin

Geodesic Deviation Equation in Bianchi Cosmologies

We present the Geodesic Deviation Equation (GDE) for the Friedmann-Robertson-Walker(FRW) universe and we compare it with the equation for Bianchi type I model. We justify consider this cosmological model due to the recent importance the Bianchi Models have as alternative models in cosmology. The main property of these models, solutions of Einstein Field Equations (EFE) is that they are homogeneous as the FRW model but they are not isotropic. We can see this because they have a non-null Weyl tensor in the GDE.Comment: Submitted to Journal of Physics: Conference Series (JPCS), ERE200

On non-relativistic QQˉQ\bar Q potential via Wilson loop in Galilean space-time

We calculate the static Wilson loop from string/gauge correspondence to obtain the $Q\bar Q$ potential in non-relativistic quantum field theory, i.e. CFT with Galilean symmetry. We analyze the convexity conditions \cite{bachas} for $Q\bar Q$ potential in this theory, and obtain restrictions for the acceptable dynamical exponent $z$.Comment: 8 pages, 1 figure, revtex, accepted in MPL

Distanciamiento social ante la COVID-19: Simulación del aforo máximo de personas mediante PHP

Population confluence in internal or external areas considerably increases transmission of COVID-19, due to not respecting the social distancing established by the health system. The objective of this work was to make use of programming techniques, using the PHP language (hypertext preprocessor), for the development of an application that simulates the maximum capacity of people who can enter an internal or external area. The methodology allowed recognizing common internal and external areas, configurating to the development environment, coding, simulation proposing and executing of the simulator where a practical case and ten places were evaluated to determine its reliability. The simulator provided the maximum capacity of people who can enter an internal or external area, complying with the social distancing of 2 m. The results made it possible to know that the use of information technologies through programming techniques and the PHP language contributed to being a technological alternative for the fight against the spread of the virus.La confluencia poblacional en áreas internas o externas incrementa considerablemente la trasmisión de la COVID-19, por no respetar el distanciamiento social que establece el sistema de salud. El objetivo de este trabajo fue hacer uso de técnicas de programación, empleando el lenguaje PHP (preprocesador de hipertexto), para el desarrollo de una aplicación que simule el aforo máximo de personas que pueden ingresar a un área interna o externa. La metodología permitió el reconocimiento de áreas internas y externas comunes, configuración al entorno de desarrollo, codificación, propuesta de simulación y ejecución del simulador donde se ha evaluado un caso práctico y diez lugares para determinar su confiabilidad. El simulador brindó el aforo máximo de personas que pueden ingresar a un lugar de área interna o externa cumpliendo el distanciamiento social de 2 m. Los resultados permitieron conocer que el uso de las tecnologías de información a través de las técnicas de programación y el lenguaje PHP contribuyó en ser una alternativa tecnológica para la lucha contra la propagación del virus

Insights on the stellar mass-metallicity relation from the CALIFA survey

We use spatially and temporally resolved maps of stellar population properties of 300 galaxies from the CALIFA integral field survey to investigate how the stellar metallicity (Z*) relates to the total stellar mass (M*) and the local mass surface density ($\mu$*) in both spheroidal and disk dominated galaxies. The galaxies are shown to follow a clear stellar mass-metallicity relation (MZR) over the whole 10$^9$ to 10$^{12}$ M$_{\odot}$ range. This relation is steeper than the one derived from nebular abundances, which is similar to the flatter stellar MZR derived when we consider only young stars. We also find a strong relation between the local values of $\mu$* and Z* (the $\mu$ZR), betraying the influence of local factors in determining Z*. This shows that both local ($\mu$*-driven) and global (M*-driven) processes are important in determining the metallicity in galaxies. We find that the overall balance between local and global effects varies with the location within a galaxy. In disks, $\mu$* regulates Z*, producing a strong $\mu$ZR whose amplitude is modulated by M*. In spheroids it is M* who dominates the physics of star formation and chemical enrichment, with $\mu$* playing a minor, secondary role. These findings agree with our previous analysis of the star formation histories of CALIFA galaxies, which showed that mean stellar ages are mainly governed by surface density in galaxy disks and by total mass in spheroids.Comment: 6 pages, 3 figures, accepted for publication in ApJ

Estudio de áreas afectadas de inundación en las cuencas del Guadalquivir y Guadalete a partir de imágenes radar del satélite terrasar-x. REDIAM

Las intensas precipitaciones acaecidas en los meses invernales del presente año hidrológico 2009-2010 en toda la región andaluza, han propiciado se produzcan inundaciones en diferentes ámbitos de la región y más concretamente en ámbitos cercanos a las llanuras de inundación de diferentes cuencas hidrográficas. En este sentido es imprescindible estudiar el alcance de la lámina de agua producida por estas crecidas y desbordamientos proporcionando esta situación la mejor oportunidad de cartografiar este aspecto, obteniéndolo directamente y no en base a modelos de simulación. Con este fin se ha hecho uso de la Teledetección mediante la tecnología Radar para la adquisición de imágenes de varios ámbitos de interés, a partir de las cuales se ha obtenido la localización y caracterización de las áreas afectadas. El presente artículo describe los trabajos realizados para la obtención de cartografía de áreas afectadas de inundación en fases de emergencia en cinco ámbitos de la región andaluza, en donde el grado de afección ha sido especialmente relevante, concretamente en la Cuenca Guadalquivir (Andújar- Villa del Río; Alcolea-Córdoba; Palma del Río-Lora del Río; Alcolea del Río-Sevilla) y en la Cuenca del Guadalete.The intense precipitations happened in the winter months of the present hydrological year 2009-2010 in the whole Andalusian region, have propitiated water floods they take place in different environments of the region and more concretely in near environments to the flood plains of different river basins. In this sense it is indispensable to study the reach of the sheet of water taken place by these grown ones and overflows providing this situation the best opportunity to cartography this aspect, obtaining it directly and not based on simulation models. With this end the Remote Sensing by means of the technology Radar for the acquisition of images of several environments of interest, starting from which it has been obtained the localization and characterization of the affected areas. The present article describes the works carried out for the obtaining flood mapping affected areas in emergency phases in five environments of the Andalusian region where the affection degree has been specially excellent, concretely in the Guadalquivir Basin (Andújar-Villa del Río; Alcolea-Córdoba; Palma del Rio-Lora del Rio; Alcolea del Rio-Seville) and in the Guadalete Basin

Producción de ortofotos históricas para la generación de base de datos temáticas. Cartografía de usos y cobertura del suelo. REDIAM

Con objeto de dotar de una base de información multitemporal a la Infraestructura de Información Ambiental de Andalucía y en especial la cartografía de Usos y Coberturas Vegetales del Suelo, es necesario partir de la información histórica disponible y concretamente de los vuelos fotogramétricos históricos a partir de los cuales generar las Bases de Referencia Territoriales Históricas. Para ello, desde la Red de Información Ambiental de Andalucía (Rediam) se ha llevado a cabo la ortorrectificación de vuelos con cobertura completa regional: Vuelo americano de 1956; Vuelo Interministerial de 1977-78 (comúnmente denominado IRYDA) y Vuelo General de 1984-85. Este artículo describe el proceso y metodología desarrollados para la obtención de Bases de Referencia a partir de la ortorrectificación de varios vuelos de todo el ámbito regional, cuyo desarrollo tiene ciertas variaciones respecto al proceso fotogramétrico clásico debido a que se trata de documentación histórica. Los productos obtenidos se integran en el Catálogo de Información Ambiental para su aplicación directa en la obtención de cartografía temática y su difusión a través del Canal de la Red de Información Ambiental de Andalucía: Servicios OGC (WMS), Visor de Descargas de Imágenes del territorio,…Historical photogrammetric flights, which were used to generate historical reference maps, have been used in order to add multitemporal information to Infraestructure for Environment Information in Andalusia and especially to the cartography about land covers and uses. The Andalusian Environmental Information Network (Rediam) has carried out the orthorectification of whole regional coverage flights: the American flight (1956), the Inter-ministerial or IRYDA flight (1977-78) and the General Flight of Spain (1984-85). This paper describes the process and methodology developed to obtain reference maps from the orthorectification of different whole regional coverage flights. The process is different from the classic photogrammetric process given that historical documentation is used.The final products have been integrated in the Environmental Information Catalog for their straight application in the obtaining of thematic cartography and their diffusion through the Andalusian Environmental Information Network Channel: OGC Services (WMS), territorial information viewers,

New Supergravity Backgrounds Dual to N=1 SQCD-like Theories with N_f=2N_c

We present new supergravity backgrounds generated by N_c D5-branes, wrapping the S^2 of the resolved conifold, in the presence of N_f = 2 N_c smeared flavor D5-branes. The smearing allows us to take their backreaction on the geometry into account. We discuss the consistency, stability, and supersymmetry of these types of setups. We find near horizon geometries that we expect to be supergravity duals of SQCD-like theories with N_f= 2N_c. From these backgrounds we numerically extract rectangular Wilson loops and beta functions of the dual field theory for the regime where our approximations are valid.Comment: 22+24 pages, 17 figures, Figure 12 replace