Construcción de un modelo de nodo híbrido de red inalámbrica WiMAX - Red Óptica Pasiva (PON)

Dentro del grupo de investigación de Banda Ancha, en el departamento de Telemática, se ha implementado un modelo que reproduce el comportamiento de una red E-PON (Ethernet Passive Optical Network). El objetivo de este PFC es incorporar un modelo de un nodo que integra la unidad en el extremo de acceso de la fibra óptica (Optical Network Unit), con una estación bace WiMAX (IEEE 802.11d/e). Las actividades comenzarán con el estudio de la herramienta. A continuación, se implementará el modelo del nodo híbrido, para finalmente realizar pruebas de verificación. La implementación se realizará con el potente software comercial OPNET

The Emergence of Native Podcasts in Journalism: Editorial Strategies and Business Opportunities in Latin America

This article analyses the state of the art of podcasting in the new digital landscape as well as the structures, editorial strategies, and business models of native podcasts launched in Latin America over the last few years. To this end, a multiple case study has been made to examine the way new digital outlets are using audio content. This qualitative research is made up of a variety of approaches, such as interviews, online surveys of podcasters, as well as the collection and analysis of secondary data. A specific aim of this comparative study was to include a sample of podcasts produced by thirteen emerging media platforms from eight countries registered in the directory of digital natives conducted by SembraMedia (https://www.sembramedia.org). This is a nonprofit organization dedicated to increasing the diversity and quality of Spanish language content by helping digital media entrepreneurs become more sustainable and successful. Results of this exploratory study reveal that native podcasting in Spanish is still expanding and that where the new media are small in scale, they are more oriented to the full exploitation of the narrative and innovative possibilities of this audio format and do not have responding to their target audiences’ needs as their main priority. These new media are finding different ways to become monetised (mainly content production for clients, sponsored content, sponsorship, consulting services, and advertising) and to make a profit

Improving the surface finish of concave and convex surfaces using a ball burnishing process

The ball burnishing process is done to improve the surface finish of workpieces that have been previously machined. In this article we present the results of tests performed with this process that was applied to workpieces with a convex or concave surface of two different materials: aluminum A92017 and steel G10380. An experiment to do the tests was designed. The results of measurements of surface roughness are presented in this paper as well. These results are compared to those measured in the workpieces before being burnished. After that conclusions are drawn about the improvement of surface roughness applied to the workpieces through the ball burnishing process. The main innovation of this paper is that we work with concave and convex geometries. We also obtain a table of recomended parameter values for the process

Estimation of specific cutting energy in an S235 alloy for multi-directional ultrasonic vibration-assisted machining using the Finite Element Method

The objective of this work is to analyze the influence of the vibration-assisted turning process on the machinability of S235 carbon steel. During the experiments using this vibrational machining process, the vibrational amplitude and frequency of the cutting tool were adjusted to drive the tool tip in an elliptical or linear motion in the feed direction. Furthermore, a finite element analysis was deployed to investigate the mechanical response for different vibration-assisted cutting conditions. The results show how the specific cutting energy and the material’s machinability behave when using different operational cutting parameters, such as vibration frequency and tool tip motion in the x-axis, y-axis, and elliptical (x-y plane) motion. Then, the specific cutting energy and material’s machinability are compared with a conventional turning process, which helps to validate the finite element method (FEM) for the vibration-assisted process. As a result of the operating parameters used, the vibration-assisted machining process leads to a machinability improvement of up to 18% in S235 carbon steel. In particular, higher vibration frequencies were shown to increase the material’s machinability due to the specific cutting energy decrease. Therefore, the finite element method can be used to predict the vibration-assisted cutting and the specific cutting energy, based on predefined cutting parameters.Peer ReviewedPostprint (published version

Electroplastic cutting influence on power consumption during drilling process

The aim of this study is to report the use of non-conventional material removal process technique. It was found that electropulses (EPs) assisted drilling process improves the material machinability based on the eletroplastic influence. The influence of EPs in drilling process is studied by combining different feed rates, drills diameters, and current densities in 7075 aluminium and 1045 carbon steel. The results show that the electrically assisted drilling process improves material machinability, decreases the specific cutting energy up to 27 % in aluminium and 17 % in steel.Peer ReviewedPreprin

Observation of radio galaxies with HAWC

The High Altitude Water Cherenkov (HAWC) Gamma-Ray Observatory is an extensive air shower array located in Puebla, Mexico. The closest radio galaxy within the HAWC field of view, M87, has been detected in very high energies. In this work we report upper limits on the TeV {\gamma}-ray flux of the radio galaxy M87. At a distance of 16 Mpc, M87 is a supergiant elliptical galaxy located in the Virgo Cluster that has been observed from radio wavelengths to TeV {\gamma}-rays. Although a single-zone synchrotron self-Compton model has been successfully used to explain the spectral energy distribution of this source up to a few GeV, the {\gamma}-ray spectrum at TeV has been interpreted within different theoretical models. We discuss the implications of these upper limits on the photo-hadronic interactions, as well as the number of neutrino events expected in the IceCube neutrino telescope.Comment: 8 pages, 1 figure, ICRC 201

La heroína de Segovia : narración histórica dedicada a ... S. A. R. la Infanta Doña María Isabel Francisca

Composición premiada en los Juegos Florales verificados en Segovia el día 21 de septiembre de 1902Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 201

El impacto del tamaño de los clubs deportivos en su financiación. Un análisis cuantitativo en la Comunitat Valenciana.

Dentro del subsector no de mercado de la Economía Social predominan las entidades asociativas que se caracterizan por la libre adhesión de miembros, el gobierno democrático y la carencia de ánimo de lucro. Los clubs deportivos son un subtipo específico de asociación que, debido a su elevada presencia y dispersión por el territorio, así como por su misión principal, producen un significativo impacto socioeconómico y numerosos efectos positivos en la sociedad. Sin embargo, muchas de estas organizaciones se hallan en situación de insuficiencia financiera, siendo la obtención de recursos el problema más común a la que se enfrentan sus gestores, por ello, la gestión de la financiación y el mantenimiento de un tamaño óptimo resultan cuestiones cruciales para el desarrollo de su actividad. Los cerca de 6.500 clubs deportivos activos presentes en la Comunitat Valenciana componen un universo poblacional con rasgos muy heterogéneos, donde una inmensa mayoría de entidades mantienen pequeñas dimensiones y, al mismo tiempo, hay presentes algunos clubs de tamaño mediano e incluso de gran envergadura. Esta tesis doctoral analiza el impacto que las dimensiones internas de los clubs deportivos ejercen sobre sus modelos organizativos y sus estructuras financieras, centrándose particularmente sobre la forma en que obtienen los ingresos necesarios para lograr crecer, mantenerse o incluso sobrevivir según su tamaño. La investigación se ha cimentado en un amplio trabajo empírico, cuya principal herramienta para la obtención de datos cuantitativos ha consistido en una encuesta de campo realizada sobre una muestra estadísticamente significativa y proporcionalmente distribuida respecto al universo conocido, compuesta por un total de 520 clubs deportivos valencianos. Además, se ha desarrollado un modelo propio para el análisis de la financiación estructurado en ocho categorías de ingresos estancas, que permite su adaptación a otros modelos teóricos existentes, así como también se ha diseñado un sistema propio de clasificación de los clubs por tamaño, dividiéndolos en cuatro segmentos dimensionales con base en dos variables: el número de socios y el presupuesto anual de estas entidades.Associations are the most numerous entities within the non-market subsector of the Social Economy, these entities are characterized for being non-profit, its democratic governance and its voluntary and free membership. Sports clubs are a specific subtype of association which, due to their high presence and dispersion throughout the territory, as well as their main mission, produce a significant socioeconomic impact and numerous positive effects on society. However, many of these organizations are in a financial insufficiency situation and obtaining resources is the most common problem faced by their boards, that is why income management and maintenance of an optimal size are crucial issues for the development of their activity. The nearly 6,500 active sports clubs present in the Valencian Community compose a population universe with very heterogeneous characteristics, where a vast majority of entities maintain small dimensions and, at the same time, there are some mediumsized and even large clubs. This doctoral thesis analyzes the impact that the internal dimensions of sports clubs have on their organizational models and financial structures, focusing particularly on the ways in which they gather the necessary resources to grow, maintain or even survive according to their size. The research has been based on an extensive empirical work, whose main tool for obtaining quantitative data has been a field survey conducted on a statistically significant sample, proportionally distributed according to the known population universe, consisting of a total of 520 Valencian sports clubs. In addition, an own model structured in eight income categories has been developed for the analysis of financing, which allows its adaptation to other existing theoretical models, as well as an own system for the classification of clubs by size, dividing them into four dimensional segments based on two variables: the number of members and the annual budget of these entities

Newsletter as a journalist product aiming at new readers. Study on editorial email newsletters launched by El País, El Español and El Independiente

En la era de la saturación informativa digital y de la dispersión de contenidos a través de las plataformas sociales, la newsletter es concebida por los medios de comunicación como una vía cada vez más relevante para poder conectar directamente con la audiencia y atraer a nuevos públicos más allá de las secciones informativas tradicionales, mediante la especialización y la personalización de los contenidos. Este artículo analiza, en primer lugar, las distintas tipologías de newsletters existentes en el panorama mediático internacional, tanto en los legacy media como en nuevas marcas periodísticas digitales surgidas en los últimos años (Quartz, Buzzfeed, Vox, The Skimm y Ozy); y, sobre todo, se detiene en la comparación pormenorizada de los contenidos, la estructura y los modelos de negocio de tres boletines de noticias de medios de comunicación españoles: uno tradicional (El País), otro nativo digital (El Español) y otro de nicho de información de política y economía (El Independiente). Los resultados señalan que España no es ni mucho menos ajena a la eclosión internacional que experimenta este producto periodístico y que la definición del modelo de newsletter que se persigue poner en marcha está directamente relacionado con el método de financiación de cada medio de comunicación.In the digital era of information saturation and dispersion of content through social platforms, newsletters are more and more regarded by media as a way to connect directly to audiences and to draw new publics beyond traditional sections of information by means of both specialization and personalization of content. This article first analyses different types of newsletters that are being produced in the international media landscape nowadays, not only the ones launched by legacy media but also by new digital journalism brands appeared in these last years (Quartz, Buzzfeed, Vox, The Skimm y Ozy). And secondly, and above all, this study focuses on a detailed comparison between contents, structure and business models of editorial newsletters published by three Spanish media: one legacy media (El País), on native digital (El Español) and another politics and economy niche one (El Independiente). Results show how Spain does not stay apart from the expansion of this product in media worldwide and how payment methods and financing possibilities turn out to be a key element that defines the model of newsletters media want to launch in each case.10.6035/2174-0992.2018.15.

Global solution of nematic liquid crystals models

We prove existence of a global weak solution for a nematic liquid crystal problem by means of a penalization method using a simplified Ericksen-Leslie model and a new compactness property for the gradient of the director field