Recursos de colección

Archivo Digital UPM (121.743 recursos)

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

Estado = En Prensa

Mostrando recursos 1 - 10 de 10

  1. Crown Walls in Mass and Reinforced Concrete: The Way to Aesthetics in Maritime Works

    Negro Valdecantos, Vicente; Martín Antón, Mario; Campo Yagüe, José María del; López Gutiérrez, José Santos; Esteban Pérez, María Dolores
    Maritime works are characterized by their remarkable size, length, depth and extraordinarily great demand for natural or artificial materials. To this effect, despite functional designs or the ultimate limit state, a breakwater crown wall can increase the overall effectiveness of the structure in limiting wave overtopping. It will contribute to a reduction of volume of material required and hence the cost to achieve a given level of performance depending on the precautions to be taken on the basis of the critical discharges for functional safety (vehicles, pedestrian and buildings) and structural safety (embankment and revetment seawalls), amongst others. In many...

  2. Kondo temperature and Heavy Fermion behavior in Yb1−xYxCuAl series of alloys

    Rojas Pupo, Daniel; Gandra, F.G.; Medina, A.N.; Fernández Barquín, L.; Gómez Sal, J.C.
    We report, in the present article, a detailed study of the chemical substitution effects on the magnetic, electronic transport and thermal properties of the intermediate valence system YbCuAl (Yb 1-xYxCuAl series of alloys). A more complete characterization of this series of alloys is provided including the analysis of the thermal and electronic transport properties. It is worth noticing, that less attention has been paid to experimental evidences of the ?negative pressure? effects, within right side of the Doniach diagram, when the systems move away from the QCP. Thus, it is worthwhile to explore the region of higher hybridization states, when...

  3. Análisis térmico del instrumento TIRS (MEDA) del Rover de la misión MARS 2020 = Thermal analysis of TIRS instrument from the MARS 2020 mission rover

    Chamorro Moreno, Adrián
    Análisis térmico del instrumento TIRS (MEDA) del Rover de la misión MARS 2020

  4. Enabling an Anatomic View to Investigate Honeypot Systems: A Survey

    Fan, Wenjun; Du, Zhihui; Fernández Cambronero, David; Villagra González, Victor Abraham
    A honeypot is a type of security facility deliberately created to be probed, attacked and compromised. It is often used for protecting production systems by detecting and deflecting unauthorized accesses. It is also useful for investigating the behaviour of attackers, and in particular, unknown attacks. For the past 17 years much effort has been invested in the research and development of honeypot based techniques and tools and they have evolved to become an increasingly powerful means of defending against the creations of the blackhat community. In this paper, by studying multiple honeypot systems, the two essential elements of honeypots - the...

  5. Impact of extended contact co-firing on multicrystalline silicon solar cell parameters

    Peral Boiza, Ana; Dastgheib-Shirazi, Amir; Fano, Vanesa; Jimeno, Juan Carlos; Hahn, Giso; Cañizo Nadal, Carlos del
    During the temperature spike of the contact co-firing step in a solar cell process, it has been shown that the concentration of lifetime-killer dissolved metallic impurities increases, while adding an annealing after the spike getters most of the dissolved impurities towards the phosphorus emitter, where they are less detrimental. The contact co-firing temperature profile including the after-spike annealing has been called extended contact co-firing, and it has also been proposed as a means to decrease the emitter saturation current density of highly doped emitters, benefiting thus a wide range of materials in terms of detrimental impurity content. The aim of the present...

  6. Analysis of tether-mission concept for multiple flybys of moon Europa

    Sanmartín Losada, Juan Ramón; Charro, Mario; Garret, Henry B.; Sánchez Arriaga, Gonzalo; Sánchez Torres, Antonio
    All four giant planets, far from the Earth and sun and having deep gravitational wells, present propulsion and power mission issues, but they also have an ambient plasma and magnetic field that allows for a common mission concept. Electrodynamic tethers can provide propellantless drag for planetary capture and operation down the gravitational well, and they can generate power to use along with or be stored for inverting tether current. The design for an alternative to NASA’s proposed Europa mission is presented here. The operation requires the spacecraft to pass repeatedly near Jupiter, for greater plasma density and magnetic field, raising a radiation-dose issue that...

  7. Thermal shields for heat loss reduction in Siemens-type CVD reactors

    Ramos Cabal, Alba; Valdehita Torija, Javier; Zamorano Saavedra, Juan Carlos; Cañizo Nadal, Carlos del
    The use of thermal shields to reduce radiation heat loss in Siemens-type CVD reactors is analyzed, both theoretically and experimentally. The potential savings from the use of the thermal shields is first explored using a radiation heat model that takes emissivity variations with wavelength into account, which is important for materials that do not behave as grey bodies. The theoretical calculations confirm that materials with lower surface emissivity lead to higher radiation savings. Assuming that radiation heat loss is responsible for around 50% of the total power consumption, a reduction of 32.9% and 15.5% is obtained if thermal shields with constant emissivities...

  8. Interpretación de los datos de auscultación de presas por métodos no convencionales

    Toledo Municio, Miguel Angel; Salazar, Fernando; Moran Moya, Rafael; Morera González, León; Roa, Alfonso; Santillán Sánchez, David; Moran Moya, Rafael
    Las conferencias presentadas durante la Jornada Técnica sobre Avances en investigación aplicada en seguridad hidráulica de presas organizada por el Centro de Estudios Hidrográficos del CEDEX y la Universidad Politécnica de Madrid el mes de junio de 2013 versan sobre la mejora de la seguridad hidráulica de las presas, una materia de especial importancia en nuestro país (habida cuenta del elevado número de infraestructuras de regulación en servicio y de su antigüedad media) y constituye una tarea en la que tanto el CEDEX como la Universidad Politécnica de Madrid han trabajado activamente en los últimos años. Todo profesional familiarizado con...

  9. Cover cracking of reinforced concrete due to rebar corrosión induced by chloride penetration

    Gálvez Ruiz, Jaime; Guzmán Gutiérrez, Santiago; Fenaux, Michiel; Reyes Pozo, Encarnación; Moragues Terrades, Amparo
    Este artículo estudia el proceso de fisuración del hormigón por corrosión de la armadura. Se presenta un modelo de transporte de cloruros en el hormigón, que contempla la no-linealidad de los coeficientes de difusión, las isotermas de absorción y el fenómeno de convección. A partir de los resultados de penetración de cloruros, se establece la corrosión de la armadura con la consiguiente expansión radial. La fisuración del hormigón se estudia con un modelo de fisura embebida. Los dos modelos (iniciación y propagación) se incorporan en un programa de elementos finitos. El modelo se contrasta con resultados experimentales, obteniéndose un buen...

  10. Modelling uncertainty of flood quantile estimation at ungauged sites by Bayesian networks

    Santillán Sánchez, David; Mediero Orduña, Luis; Garrote de Marcos, Luis
    Prediction at ungauged sites is essential for water resources planning and management. Ungauged sites have no observations about the magnitude of floods, but some site and basin characteristics are known. Regression models relate physiographic and climatic basin characteristics to flood quantiles, which can be estimated from observed data at gauged sites. However, these models assume linear relationships between variables Prediction intervals are estimated by the variance of the residuals in the estimated model. Furthermore, the effect of the uncertainties in the explanatory variables on the dependent variable cannot be assessed. This paper presents a methodology to propagate the uncertainties that...

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