Recursos de colección

Archivo Digital UPM (114.084 recursos)

This is an institutional repository providing access to the research output of the institution. Primarily contains thesis.

Tipo de documento = Artículo

Mostrando recursos 1 - 20 de 604

  1. Geometría y topología en Kahn

    Juárez Chicote, Antonio
    Geometría y topología en Kahn

  2. Eduardo Chillida: el principio de las cosas

    Juárez Chicote, Antonio
    Eduardo Chillida: el principio de las cosas

  3. Efecto de la gestión forestal en la cantidad de carbono del suelo mineral en una masa de Pinus pinaster Ait.

    Ruiz-Peinado, Ricardo; Bravo-Oviedo, Andrés; López Senespleda, Eduardo; Onrubia Fernández, Raquel; Rubio Cuadrado, Álvaro; Sastre López, Salvador; del Río Gaztelurrutia, Miren; Montero González, Gregorio
    El conocimiento del impacto de la gestión forestal sobre los diversos compartimentos de carbono existentes en una masa forestal es prioritario para la sostenibilidad del aprovechamiento y gestión de los sistemas forestales. Con la aplicación de tratamientos selvícolas hay una serie de transformaciones en la masa como la reducción de biomasa en pie, la modificación de la cantidad de residuos o la disminución de la incorporación de hojarasca, la alteración del microclima del suelo por mayor presencia de luz y su influencia en las condiciones de humedad y temperatura. Este cambio en las condiciones modifica el contenido de carbono en...

  4. 10 MeV proton irradiation effects on GaInP/GaAs/Ge concentrator solar cells and their component subcells

    Ochoa Gómez, Mario; Yaccuzzi, E.; Espinet González, Pilar; Barrera, M.; Barrigón Montañés, Enrique; Ibarra, M. L.; Contreras, Y.; López, E.; Alurralde, M.; Algora del Valle, Carlos; Godfrin, E. M.; Rey-Stolle Prado, Ignacio; Plá, J.
    In this paper, the experimental results of a 10 MeV proton irradiation on concentrator GaInP/GaAs/Ge lattice-matched triple-junction solar cells and their corresponding subcells are examined. Electro-optical characterization such as external quantum efficiency, light and dark I-V measurements, is performed together with theoretical device modeling in order to guide the analysis of the degradation behavior. The GaInP (on Ge) and Ge cell showed a power loss between beginning of life and end of life of about 4% while the GaInP/GaAs/Ge and GaAs solar cells exhibited the highest damage measured of 12% and 10%, respectively for an irradiation fluence equivalent to an...

  5. El arte de construir con agujeros. Reflexiones en torno a Robert Le Ricolais

    Juárez Chicote, Antonio
    El arte de construir con agujeros. Reflexiones en torno a Robert Le Ricolais

  6. A propósito de Robert Le Ricolais

    Juárez Chicote, Antonio
    A propósito de Robert Le Ricolais

  7. Sea Ranch y el Wood Power: una reivindicación de la cultura underdog

    Juanes Juanes, Blanca
    Sustituida por otros materiales surgidos de los sofisticados procesos de investigación que se llevaron a cabo en los Estados Unidos de posguerra, la madera se convierte, en el Sea Ranch, en la materia prima perfecta para indagar en un nuevo lenguaje. A la conexión que su procedencia renovable establece con el planteamiento proyectual, se añade la apuesta por lo matérico como respuesta a necesidades contemporáneas que sólo los nuevos sistemas parecen suplir. Lejos de actitudes estereotipadas o la defensa no argumentada de sus bondades, la madera se transforma en un vehículo de formalización de lo cotidiano a través de sucesivas...

  8. Analytical calculation of photovoltaic systems maximum power point (MPP) based on the operation point

    Cubas Cano, Javier; Pindado Carrion, Santiago; Sorribes Palmer, Félix
    This work proposes a new analytical model to extract the 1-Diode/2-Resistor solar cell/panel equivalent circuit parameters. The methodology is based on a reduced amount of experimentally measured information: short-circuit current, the slope of the I-V curve at that point, the open-circuit voltage, and the current and voltage levels, together with the slope of the I-V curve at the instantaneous operation point. This procedure is specially designed to analyze the performance of autonomous photovoltaic systems, which are most of the primary sources for spacecraft power. Results show good agreement with experimental data. Furthermore, this methodology allows for fast and accurate I-V curve maximum...

  9. On solar panels testing for small-size satellites. The UPMSAT-2 mission

    Roibas-Millan, Elena; Alonso-Moragón, Álvaro; Giménez-Mateos, Alejandro G.; Pindado Carrion, Santiago
    At present, the development of small-size satellites by universities, companies and research institutions have become a usual practice, which is spread rapidly. In this kind of projects the cost play a significant role. One of the main points are the Assembly, Integration and Test (AIT) plans, which carries out an associated cost for simulating the environmental conditions. For instance, in the power subsystems test and, in particular in the solar panels testing, the irradiance and temperature conditions might be the optimum so the performances of the system are next to real operational conditions. To reproduce the environmental conditions in terms...

  10. Collaborative mapping of emerging cities in developing countries: the León Emergente Project

    Romanillos Arroyo, Gustavo
    In the expanding constellation of collaborative map-making initiatives, a growing number of small local projects coexist along with more ambitious and global ones. In developing countries, their existence is not only compatible and complementary, but also necessary, since they meet different needs and pursue diverse and essential objectives, in addition to collecting and sharing geo-located data. In this context, this paper describes the León Emergente initiative, a collaborative living atlas for the city of León in Nicaragua. The results are presented through two main maps that illustrate, for the first time, the formal and informal economic activity of the city...

  11. Optical Hyperthermia Using Anti-Epidermal Growth Factor Receptor-Conjugated Gold Nanorods to Induce Cell Death in Glioblastoma Cell Lin

    Serrano Olmedo, Jose Javier; Ramos Gomez, Milagros
    Optical Hyperthermia Using Anti-Epidermal Growth Factor Receptor-Conjugated Gold Nanorods to Induce Cell Death in Glioblastoma Cell Lin

  12. Data publications correlate with citation impact

    Leitner, Florian; Bielza Lozoya, María Concepción; Hill, Sean L.; Larrañaga Múgica, Pedro María
    Neuroscience and molecular biology have been generating large atasets over the past years that are reshaping how research is being conducted.In their wake, open data sharing has been singled out as a major challenge for the future of research. We conducted a comparative study of citations of data publications in both fields, showing that the average publication tagged with a data-related term by the NCBI MeSH(MedicalSubjectHeadings) curators achieves a significantly larger citation impact than the average in either field. We introduce a new metric, the data article citation index(DAC-index), to identify the most prolific authors among those data-related publications.The study...

  13. A review of software project testing

    Calvo-Manzano Villalón, José Antonio; Cuevas Agustín, Gonzalo; San Feliu Gilabert, Tomás; Jiménez Puello, José de Jesús
    In this article a review of software projects based on a taxonomy project is established, allowing the development team or testing personnel to identify the tests to which the project must be subjected for validation. The taxonomy is focused on identifying software projects according to their technology. To establish the taxonomy, a development method comprised of 5 phases was applied.

  14. Wiring economy of pyramidal cells in the juvenile rat somatosensory cortex

    Antón Sánchez, Laura; Bielza Lozoya, María Concepción; Larrañaga Múgica, Pedro María; Felipe Oroquieta, Javier de
    Ever since Cajal hypothesized that the structure of neurons is designed in such a way as to save space, time and matter, numerous researchers have analyzed wiring properties at different scales of brain organization. Here we test the hypothesis that individual pyramidal cells, the most abundant type of neuron in the cerebral cortex, optimize brain connectivity in terms of wiring length. In this study, we analyze the neuronal wiring of complete basal arborizations of pyramidal neurons in layer II, III, IV, Va, Vb and VI of the hindlimb somatosensory cortical region of postnatal day 14 rats. For each cell, we...

  15. Automatic extraction and identification of users' responses in Facebook medical quizzes

    Rodríguez González, Alejandro; Menasalvas Ruiz, Ernestina; Mayer Pujadas, Miguel A.
    In the last few years the use of social media in medicine has grown exponentially, providing a new area of research based on the analysis and use of Web 2.0 capabilities. In addition, the use of social media in medical education is a subject of particular interest which has been addressed in several studies. One example of this application is the medical quizzes of The New England Journal of Medicine (NEJM) that regularly publishes a set of questions through their Facebook timeline.

  16. La escalera: un elemento antropológico y simbólico. Una investigación sobre las escaleras en el Templo de Long Chang (China)

    Wang, Weiqiao
    En la época de la producción en masa, la arquitectura está en camino a la producción rápida y la industrialización. El espacio de la escalera es uno de los elementos arquitectónicos que ha sido sacrificado. Al mismo tiempo, también perseguimos la textura y la calidad del espacio arquitectónico del patrimonio de nostalgia. El valor del patrimonio arquitectónico ha recibido una atención creciente, no sólo por su importancia histórica, sino también por su inspiración a la arquitectura contemporánea. A partir del patrimonio budista, el Templo Long Chang, el artículo trata de llegar a la conclusión de la inspiración para el diseño...

  17. Usability testing in mobile applications involving people with down syndrome: a literature review

    Cáliz Ramos, Doris Cruz; Martínez Normand, Loïc; Alamán Roldán, Xavier; Terán Villamarín, Carlos; Cáliz Ramos, Richarth Harold
    We present a review of research related to the usability testing of mobile applications including participants with Down syndrome. The purpose is to identify good usability testing practices and possible guidelines for this process when participants are people with this cognitive disability. These practices and guidelines should account for their specific impairments. We applied document analysis techniques to searches of scientific databases. The results were filtered considering how well they matched the research topic. We processed and reported the classified and summarized results. The main findings of this literature review is that mobile applications usability testing including people with Down...

  18. Labor de encaje. Piscina en Laracha, A Coruña. Carlos Quintáns, Antonio Raya y Cristóbal Crespo

    Baldellou, Miguel Ángel
    Labor de encaje. Piscina en Laracha, A Coruña. Carlos Quintáns, Antonio Raya y Cristóbal Crespo

  19. A general framework for static profiling of parametric resource usage

    López García, Pedro; Klemen, Maximiliano; Liqat, Umer; Hermenegildo, Manuel V.
    For some applications, standard resource analyses do not provide the information required. Such analyses estimate the total resource usage of a program (without executing it) as functions on input data sizes. However, some applications require knowing how such total resource usage is distributed over selected parts of a program. We propose a novel, general, and flexible framework for setting up cost equations/relations which can be instantiated for performing a wide range of resource usage analyses, including both static profiling and the inference of the standard notion of cost. We extend and generalize standard resource analysis techniques, so that the relations...

  20. Study of voltage fluctuations caused in a distribution grid by the connection of a wave energy converter and corrective actions based on reactive power compensation

    Rivas Medina, Alicia; Rocha Mendonca, Hugo; Martínez González, Sergio
    Renewable energies, in general, have considerably increased their penetration in electrical power systems. However, they are intermittent energy sources, and large amounts of this power could create problems for the proper operation of the electrical network. In this sense, this paper studies the effects of wave energy generation on the voltages in a distribution network, using the IEEE 34-bus test feeder. In addition, corrective actions based on reactive power compensation, such as reactive compensation from the grid-side converter of the wave energy converter and the use of a STATCOM, are presented. The results show that the use of the grid-side converter...

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