Mild Velocity Dispersion Evolution of Spheroid-like Massive Galaxies since z~2

Making use of public spectra from Cimatti et al (2008), we measure for the first time the velocity dispersion of spheroid-like massive (M_star ~ 10^11 M_sun) galaxies at z ~ 1.6. By comparing with galaxies of similar stellar mass at lower redshifts, we find evidence for a mild evolution in velocity dispersion, decreasing from ~240 km/s at z ~ 1.6 down to ~180 km/s at z ~ 0. Such mild evolution contrasts with the strong change in size (a factor of ~4) found for these type of objects in the same cosmic time, and it is consistent with a progressive larger role, at lower redshift, of the dark matter halo in setting the velocity dispersion of these galaxies. We discuss the implications of our results within the context of different scenarios proposed for the evolution of these massive objects.Comment: 5 pages, 2 Figures. Accepted in ApJL. Minor changes from former submissio

Superdense massive galaxies in the Nearby Universe

Superdense massive galaxies (r_e~1 kpc; M~10^{11} Msun) were common in the early universe (z>1.5). Within some hierarchical merging scenarios, a non-negligible fraction (1-10%) of these galaxies is expected to survive since that epoch retaining their compactness and presenting old stellar populations in the present universe. Using the NYU Value-Added Galaxy Catalog from the SDSS Data Release 6 we find only a tiny fraction of galaxies (~0.03%) with r_e<1.5 kpc and M_*>8x10^{10} Msun in the local Universe (z<0.2). Surprinsingly, they are relatively young (~2 Gyr) and metal-rich ([Z/H]~0.2). The consequences of these findings within the current two competing size evolution scenarios for the most massive galaxies ("dry" mergers vs "puffing up" due to quasar activity) are discussed.Comment: Accepted for publication in ApJ Letters; 3 figure

Water management system

En este proyecto consideramos el uso racional de los recursos naturales, por lo que nuestra propuesta es contar con un sistema de gestión integral del agua que nos permita tener soluciones sostenibles como: (1) reducir el consumo de agua potable; (2) tratar y reutilizar las aguas grises para las cisternas de los inodoros; (3) el aprovechamiento de las aguas pluviales.In this project we considered the rational use of natural resources; therefore, our proposal is to have an integrated water management system that allows us to have sustainable solutions such us: (1) to reduce the consumption of drinking water; (2) to treat and to reuse the greywater for flushing the toilet; (3) rainwater exploitation.Primera edició

On the design of a planar phased array radar antenna architecture for space debris situational awareness

The Space Situational Awareness (SSA) program from the European Space Agency (ESA) protects Europe's citizens and their satellite-based services by detecting space hazards. ESA Ground Systems (GS) division is currently designing a phased array radar composed of thousands of radiating elements for future stages of the SSA program [1]. The radar shall guarantee the detection of most of the Low Earth Orbit (LEO) space debris, providing a general map of space junk. While range accuracy is mainly dictated by the radar waveform, the detection and tracking of small objects in LEO regimes is highly dependent on the angular accuracy achieved by the smart phased array antenna, demonstrating the important of the performance of this architecture

Aerial Robotic Solution for Detailed Inspection of Viaducts

The inspection of public infrastructure, such as viaducts and bridges, is crucial for their proper maintenance given the heavy use of many of them. Current inspection techniques are very costly and manual, requiring highly qualified personnel and involving many risks. This article presents a novel solution for the detailed inspection of viaducts using aerial robotic platforms. The system provides a highly automated visual inspection platform that does not rely on GPS and could even fly underneath the infrastructure. Unlike commercially available solutions, our system automatically references the inspection to a global coordinate system usable throughout the lifespan of the infrastructure. In addition, the system includes another aerial platform with a robotic arm to make contact inspections of detected defects, thus providing information that cannot be obtained only with images. Both aerial robotic platforms feature flexibility in the choice of camera or contact measurement sensors as the situation requires. The system was validated by performing inspection flights on real viaducts.Unión Europea H2020-2019-769066Unión Europea H2020-2020- 87154

GEODA-SARAS: Multi-Phased array planar antenna for satellite communications

Nowadays, earth stations have as a common feature the use of large reflector antenna for downloading data from satellites. Large reflectors have impairments such as mechanical complexity, low flexibility and high cost. Thus, the feasibility of other antenna technologies must be evaluated, such as conformal adaptive antennas based on multiple planar active arrays. In the scenery under study, the capability to track several satellites simultaneously, higher flexibility, lower production and maintenance cost, modularity and a more efficient use of the spectrum; are the most important advantage to boost up active antenna arrays over large dishes

Combination of time and spatial filtering to improve echo reduction in antenna measurements

Different research groups have been working during the last years in different echo reduction techniques applied to antenna measurements, based on spatial, modal or time filtering. Some applications where these methods are usually employed are: outdoor systems, for HF or VHF frequency systems or for small measurement systems where the anechoic material is only placed in front of the AUT. This paper analyzes the measurements of a dipole antenna (SD1900) using a StarLab system and the application of the different algorithms. It is observed that each of the algorithms is better for different situations, depending for instance on the angular value of the pattern. Finally, a combination of different methods in a smart way improve the results of the post processing with respect each independent method

Análisis de contenido cualitativo: la construcción de la imagen del partido Frente Farabundo Martí para la Liberación Nacional (FMLN) durante la campaña de las elecciones presidenciales 2018-2019 a través de las informaciones periodísticas de la sección “Nación” de La Prensa Gráfica, desarrollada del 2 de octubre de 2018 al 30 de enero de 2019.

Análisis de contenido cualitativo: La construcción de la imagen del partido Frente Farabundo Martí para la Liberación Nacional (FMLN) durante la campaña de las elecciones presidenciales 2018-2019 a través de las informaciones periodísticas de la sección Nación de La Prensa Gráfica desarrollada del 2 de octubre de 2018 al 30 de enero de 2019” es un trabajo investigativo desarrollado por estudiantes de la Licenciatura en Periodismo de la Universidad de El Salvador en el año 2020. En esta investigación se analiza el papel de manipulación e influencia de los medios de comunicación impresa durante los períodos electorales; en este caso, La Prensa Gráfica (LPG) y sus métodos de descrédito a través de sus redacciones informativas. Para ello se presenta una exploración del uso del discurso periodístico mediante instrumentos de análisis de contenido, aplicados a una muestra de noticias, que exponen como LPG hizo uso de recursos del lenguaje como tipos de párrafos, categorías gramaticales, fuentes informativas y recursos estilísticos para construir una imagen del partido de izquierda. Los resultados obtenidos demuestran como este medio de comunicación hegemónico configuró una imagen deplorable del FMLN y por consiguiente buscaba beneficiar a otro candidato en contienda por su afinidad empresarial

Effect of the inclusion of herbal phosphatidylcholine on palatability, digestibility and metabolisable energy of the diet in dogs

This study aimed to evaluate the palatability, nutrient digestibility, metabolisable energy (ME) and faecal characteristics of diets in dogs fed increasing levels of herbal phosphatidylcholine (herbal mix) versus an unsupplemented diet (with only 377 mg choline provided by 1 kg food) or choline chloride1 (2000 mg choline/kg food) in 40 adult dogs. In experiment 1, a palatability test was conducted to make two pairwise comparisons: 0 versus 200; and 0 versus 400 mg/kg herbal mix. In experiment 2, a digestibility test was performed to evaluate herbal mix at 0, 200, 400 and 800 mg/kg and 2000 mg choline provided by choline chloride. Results from experiment 1 indicated that the dogs preferred diets containing herbal mix to the unsupplemented diet (P&lt;0.05). In experiment 2, nutrient digestibility and faecal characteristics were not influenced by the treatment (P&lt;0.059). The inclusion of 400 mg/kg of herbal mix increased the ME (quadratic effect, P&lt;0.01). In conclusion, the results of this study indicate that the inclusion of a herbal mix rich in phosphatidylcholine (1.6%) and other methylated metabolites at 400 mg/kg can fully replace choline chloride in dog diets

Radiating element of GEODA-SARAS

This document shows the design of the radiating element of the conformal adaptive antenna of multiple planar arrays GEODA-SARAS. Operating from 2.05 to 2.3 GHz in the S-band with dual circular polarization in Tx and Rx, it is possible to track and communicate with several satellites because of its adaptive beam. The antenna is based on a set of similar triangular arrays which are divided in sub-arrays of five elements called cells