147 research outputs found
AZCÁRATE MENÉNDEZ, Gumersindo: Minuta de un testamento. Edición de Gonzalo Capellán de Miguel. Madrid: Fundación Giner de los Ríos [Institución Libre de Enseñanza]-Fundación Sierra Pambley, 2017, 264 pp. ISBN: 978-84-946375-1-3.
No full text[ES] Reseña del libro Azcárate Menéndez, Gumersindo: Minuta de un testamento. Edición de Gonzalo Capellán de Miguel
Accessible Routes Integrating Data from Multiple Sources
No full text[Abstract]
Providing citizens with the ability to move around in an accessible way is a requirement for all cities today. However, modeling city infrastructures so that accessible routes can be computed is a challenge because it involves collecting information from multiple, large-scale and heterogeneous data sources. In this paper, we propose and validate the architecture of an information system that creates an accessibility data model for cities by ingesting data from different types of sources and provides an application that can be used by people with different abilities to compute accessible routes. The article describes the processes that allow building a network of pedestrian infrastructures from the OpenStreetMap information (i.e., sidewalks and pedestrian crossings), improving the network with information extracted obtained from mobile-sensed LiDAR data (i.e., ramps, steps, and pedestrian crossings), detecting obstacles using volunteered information collected from the hardware sensors of the mobile devices of the citizens (i.e., ramps and steps), and detecting accessibility problems with software sensors in social networks (i.e., Twitter). The information system is validated through its application in a case study in the city of Vigo (Spain).This work was supported in part by the project Friendly barrierLess AdapTable City (FLATCity) (Ministerio de Ciencia, innovación y Universidades/ERDF, EU) funded by the Spanish Agencia Estatal de Investigación (AEI, doi 10.13039/501100011033), and in part by the European Regional Development Fund (ERDF), under Grants TIN2016-77158-C4-1-R, TIN2016-77158-C4-2-R and TIN2016-77158-C4-3-R. This work was also supported in part by the project Massive Geospatial Data Storage and Processing for Intelligent and Sustainable Urban Transportation (MaGIST), funded by the Spanish Agencia Estatal de Investigación (AEI, doi 10.13039/501100011033) under grants PID2019-105221RB-C41, PID2019-105221RB-C43 and PID2019-105221RB-C44. The research of Miguel R. Luaces was also partially founded by: Xunta de Galicia/FEDER-UE GRC: ED431C 2017/58 and Xunta de Galicia/FEDER-UE, ConectaPeme, GEMA: IN852A 2018/14. Miguel R. Luaces also wishes to acknowledge the support received from the Centro de Investigación de Galicia “CITIC”, funded by Xunta de Galicia and the European Union (European Regional Development Fund- Galicia 2014-2020 Program), by grant ED431G 2019/01. Jesús Balado and Lucía Díaz-Vilariño would like to thank to the Xunta de Galicia given through human resources grants ED481B-2019-061 and ED481D 2019/020, respectivelyXunta de Galicia; ED431C 2017/58Xunta de Galicia; IN852A 2018/14Xunta de Galicia; ED481B-2019-061Xunta de Galicia; ED481D2019/020Xunta de Galicia; ED431G 2019/0
La accidentalidad de las formas de gobierno en perspectiva histórica. Recurso para el acuerdo político (1868-1978)
No full textDerivadas de Lie: Transformaciones infinitesimales
No full textTraballo Fin de Grao en Matemáticas. Curso 2019-2020[ES] El eje central de este trabajo es la construcción de procesos de derivación sobre variedades diferenciables que sean coherentes y de carácter general. Estudiaremos dos, uno
basado en la identificación de espacios tangentes a lo largo de las curvas integrales de un
campo de vectores mediante el flujo del campo de vectores (derivada de Lie), y otro que
usa la noción de transporte paralelo a lo largo de cualquier curva asociado a una conexión
dada para tal identificación (derivada covariante).
Introducimos la derivada de Lie para campos de tensores, el concepto de transformación infinitesimal y caracterizamos los campos de vectores que resultan ser una tal transformación. En el estudio de la derivada covariante analizamos la existencia de conexiones
distinguidas (conexión de Levi-Civita) y contruimos una correcta definición de carácter
general para la aceleración de una curva[EN] The main purpose of this work is the construction of two coherent and general derivation
processes over smooth manifolds. The first one is based on the identification of the tangent
spaces along the integral curves of a vector field by means of the associated flow (Lie
Derivative), while the second one uses the notion of parallel transport along arbitrary
curves induced by a connection for the identification (covariant derivative).
We introduce the Lie derivative of tensor fields, the concept of infinitesimal tranformation as well as their characterization. In the second part, after introducing the covariant
derivative, we analyze the existence of distinguished conections (Levi-Civita conection). As
an application, the acceleration of a curve is analyze
Caracterización de un nuevo sistema de asimilación de hierro mediante sideróforos en "Vibrio anguillarum"
No full textTwo Catechol Siderophores, Acinetobactin and Amonabactin, Are Simultaneously Produced by Aeromonas salmonicida subsp. salmonicida Sharing Part of the Biosynthetic Pathway
No full textThe iron uptake mechanisms based on siderophore synthesis used by the fish pathogen Aeromonas salmonicida subsp. salmonicida are still not completely understood, and the precise structure of the siderophore(s) is unknown. The analysis of genome sequences revealed that this bacterium possesses two gene clusters putatively involved in the synthesis of siderophores. One cluster is a candidate to encode the synthesis of acinetobactin, the siderophore of the human pathogen Acinetobacter baumannii, while the second cluster shows high similarity to the genes encoding amonabactin synthesis in Aeromonas hydrophila. Using a combination of genomic analysis, mutagenesis, biological assays, chemical purification, and structural determination procedures, here we demonstrate that most A. salmonicida subsp. salmonicida strains produce simultaneously the two siderophores, acinetobactin and amonabactin. Interestingly, the synthesis of both siderophores relies on a single copy of the genes encoding the synthesis of the catechol moiety (2,3-dihydroxybenzoic acid) and on one encoding a phosphopantetheinyl transferase. These genes are present only in the amonabactin cluster, and a single mutation in any of them abolishes production of both siderophores. We could also demonstrate that some strains, isolated from fish raised in seawater, produce only acinetobactin since they present a deletion in the amonabactin biosynthesis gene amoG. Our study represents the first evidence of simultaneous production of acinetobactin and amonabactin by a bacterial pathogen and reveals the plasticity of bacterial genomes and biosynthetic pathways. The fact that the same siderophore is produced by unrelated pathogens highlights the importance of these systems and their interchangeability between different bacteria.Fil: Balado, Miguel. Universidad de Santiago de Compostela; EspañaFil: Souto, Alba. Universidad da Coruña; EspañaFil: Vences, Ana. Universidad de Santiago de Compostela; EspañaFil: Careaga Quiroga, Valeria Pilar. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad da Coruña; EspañaFil: Valderrama, Katherine. Universidad da Coruña; EspañaFil: Segade, Yuri. Universidad da Coruña; EspañaFil: Rodríguez, Jaime. Universidad da Coruña; EspañaFil: Osorio, Carlos R.. Universidad de Santiago de Compostela; EspañaFil: Jiménez, Carlos. Universidad da Coruña; EspañaFil: Lemos, Manuel L.. Universidad de Santiago de Compostela; Españ
Explicit harmonic self-maps of complex projective spaces
No full textWe study -equivariant maps between complex projective spaces. For every with , we construct two explicit families
of uncountable many harmonic self-maps of , one given by
holomorphic maps and the other by maps that are neither holomorphic nor
antiholomorphic. We prove that each solution is equivariantly weakly stable and
explicitly compute the equivariant spectrum for some specific maps in both
families.Comment: 15 pages, 1 figure. v2: section 5 has been expande
Actitud de los universitarios canarios frente al consumo de drogas
No full textProfundizar en el tema de las drogas desde una perspectiva fisio-farmacológica y psicosocial, realizando un seguimiento de la problemática de la drogadicción en la sociedad actual, centrándonos en la sociedad canaria, y más concretamente, en la población universitaria. 400 universitarios tomados al azar de entre los alumnos matriculados, correspondientes a los primeros y últimos cursos de licenciatura. Se trata de una investigación descriptivo-experimental. Los parámetros analizados fueron: edad, sexo, clase social, creencias religiosas y rendimiento académico. Se partió de la base de que estos parámetros no ejercen una influencia diferenciadora tipificada. Se denominó grupo experimental al grupo de sujetos consumidores y grupo control a los no consumidores. Cuestionario elaborado para esta investigación con 51 ítems, de las cuales 15 correspondían a preguntas abiertas y 36 a preguntas cerradas, sobre datos personales, actitud frente a las drogas, ambiente familiar etc. El método estadístico empleado es el Chi cuadrado, trabajando a unos niveles de significación de 0.1 y de 0.05 ya que se quiso reducir al máximo la posibilidad de error. Como síntesis global de este trabajo cabe señalar, refiriéndonos al marco geográfico de las Islas, de las grandes posibilidades que ofrece su situación y también del carácter y temperamento del joven universitario canario, dispuesto a captar las innovaciones y pautas marcadas por nuestra sociedad occidental. Delinear el perfil del consumidor universitario canario, supondría investigar en raíces connotativas más profundas, pero no fué esta la finalidad de este trabajo; más bien pretendíamos realizar un trabajo previo para futuros estudios de carácter más concreto y específico.ES
Las marcas de automóvil en el mercado español: estudio de posicionamiento y análisis comparativo de Citroën y Mercedes-Benz
No full text[Resumen] El sector del automóvil es uno de los sectores más importantes para la economía de la mayoría de los países del mundo, incluído España. En este trabajo se expone una breve introducción sobre dicho sector y sobre su situación en España.
A continuación, se realiza una investigación para conocer la percepción de los consumidores españoles acerca de una serie de marcas de automóviles diferentes, y de esta manera, conocer su posicionamiento en el mercado; por otra parte, se realiza un análisis de comparación de medias entre dos marcas de vehículos, Citroën y Mercedes-Benz.
Los resultados obtenidos en los mapas de posicionamiento sugieren que los consumidores agrupan a las marcas de automóviles en tres grupos diferenciados (gama alta, media y baja). Además, los resultados demuestran en el análisis de comparación entre las marcas Citroën y Mercedes-Benz que las diferencias existentes entre ambas marcas para las variables de marketing analizadas son significativas.[Resumo] O sector do automóbil é un dos sectores máis importantes para a economía da maioría dos países do mundo, incluído España. Neste traballo exponse unha breve introducción sobre dito sector e sobre a súa situación en España.
A continuación, realízase unha investigación para coñecer a percepción dos consumidores españois acerca dunha serie de marcas de automóbiles diferentes, e desta manera, coñecer o seu posiocionamento no mercado; por outra parte, realízase unha análise de comparación de medias entre dúas marcas de vehículos, Citroën e Mercedes-Benz.
Os resultados obtidos nos mapas de posicionamento suxiren que os consumidores agrupan as marcas de automóviles en tres grupos diferenciados (gama alta, media e baixa). Ademais, os resultados demostran na análise de comparación entre as marcas Citroën e Mercedes-Benz que as diferencias existentes entre ambas marcas para as variables de marketing analizadas son significativas.[Abstract] Automobile industry is one of the most important industries for the economy of the countries, including Spain. This work expose a short introduction about this sector and about his situation in Spain.
Coming up next, there is an investigation to know the perception of spanish consumers about some differet automobile brands, to know their market positioning; otherwise, it is performed an analysis about average comparison between two automobile brands, Citroën and Mercedes-Benz.
The positioning maps results suggest that costumers group the automobile brands in three different groups (high, medium and low). Also, the results show in comparison analysis between Citroën and Mercedes-Benz that differences are significant.Traballo fin de grao (UDC.ECO). ADE. Curso 2014/201
INTA Thermal testing and Model Correlation for Mechanical Thermal Strap Test - ATHENA Instrument
No full textMiguel Fern ndez, INTAAlmudena Garc a Llases, ISDEFELaurent Bastide, ISDEFEJoaqu n Azcue, INTAManuel Reina, INTAAna Balado, INTAJavier G mez Elvira, INTAICES203: Thermal TestingThe 50th International Conference on Environmental Systems was held virtually on 12 July 2021 through 14 July 2021.Scientific missions to study the Hot Universe does use of X-ray spectrometry, which detectors are transition-edge sensor (TES) superconductor detectors operating at millikelvin. That goal could be reached with a cryostat refrigerated by cryocoolers up to 2K, and subKelvin refrigeration is part of the Focal Plane Assembly, where the TES are.
DCS (Detector Cooling System) is a demonstrator of such cryostats, designed to test the performance and the functionality of a cryogen free coolers chain. The DCS is composed by two main assemblies: Focal Plane Assembly (FPA) and a Dewar (the pressure vessel structure and radiative shields cooled by Pulse tube and Joule-Thompson coolers), which creates a 2K environment for the FPA, where an ADR cools the detectors. The radiation is managed by the intermediate cooled shields, while the conduction goes through two radial paths: mechanical straps and harness.
Each mechanical strap is formed by four links of composite materials (GFRP and CFRP), selected according to structural and thermal requirements. The material distribution is GFRP for high temperature stages (300K to 30K) and CFRP in low temperature stages (30K to 2K).
To verify the design, a dedicated thermo-mechanical test was performed, submitting the straps to temperature gradients and mechanical stress similar to the expected: two straps were tested at their temperature range (at 300K), while the cold end was at 30K. Straps under a tension of 6.000N applied at room temperature, according to the DCS design. Active thermal control, insulating shields and ancillary elements, were used to create the thermal environment, and Silicon-Diode thermal sensors used to measure the strategic spots. Strain gauge was used before the cool down to measure the deformation due to the tension and check any change due to temperature changes.
This paper describes the test set-up, thermal model done and the results of such correlation
- …
