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  • Transition to a greener power sector: Four different scopes on energy security 

    Villafafila Robles, Roberto; Olivella Rosell, Pol; Rull Duran, Joan; Galceran Arellano, Samuel; Fuentes Ruiz, Sergio (Elsevier, 2020-06-01)
    Article
    Restricted access - publisher's policy
    Energy transitions have placed the power system in the center of the energy agenda, since electricity constitutes a bridge between renewable resources and the decarbonization of the global economy. Therefore, due to ...

  • LoRaMoto: a communication system to provide safety awareness among civilians after an earthquake 

    Pueyo Centelles, Roger; Meseguer Pallarès, Roc; Freitag, Fèlix; Navarro Moldes, Leandro; Ochoa, Sergio; Santos, Rodrigo (Elsevier, 2021-02)
    Article
    Restricted access - publisher's policy
    Civilians in areas hit by earthquakes become in particular concerned about the safety of family and friends. However, outages in communications networks following these events limit their capacity to get information. So, ...

  • Improved direct current control for grid connected multilevel inverters 

    Hofmann, Martin; Schaefer, Markus; Montesinos Miracle, Daniel; Ackva, Ansgar (Institute of Electrical and Electronics Engineers (IEEE), 2020-08-25)
    Article
    Restricted access - publisher's policy
    This paper presents a sensorless voltage detection method for direct current control in grid connected multilevel inverters. The direct current control is based on Scalar Hysteresis Controller (SHC). The SHC is a simplified ...

  • Hybrid nonlinear autoregressive neural network—Weibull statistical model applied to the supercritical extraction of lanolin from raw wool 

    Valverde Salamanca, Abel; Álvarez Flórez, Jesús Andrés; Recasens Baxarías, Francisco Javier (Springer, 2020-09-09)
    Article
    Restricted access - publisher's policy
    Supercritical extraction of lanolin from raw wool with modified CO2 (5% ethanol) at temperatures above the melting point of lanolin (T = 36–42 ºC) is difficult to model because of the multicomponent diffusion in the liquid ...

  • Principles of operation of grids of DC and AC subgrids interconnected by power converters 

    Gomis Bellmunt, Oriol; Sánchez Sánchez, Enric; Arévalo Soler, Josep; Prieto Araujo, Eduardo (Institute of Electrical and Electronics Engineers (IEEE), 2020-06-15)
    Article
    Restricted access - publisher's policy
    The concept of segmented AC power systems interconnected by means of HVDC is becoming more and more significant for many cases worldwide. Such systems are already existing and will become more complex with the increasing ...

  • Passivity-based analysis and performance enhancement of a vector controlled VSC connected to a weak AC Grid 

    Agbemuko, A. J.; Domínguez Garcia, José Luis; Gomis Bellmunt, Oriol; Harnefors, Lennart (Institute of Electrical and Electronics Engineers (IEEE), 2020-03-23)
    Article
    Open Access
    Despite attempts to increase the active power capability of vector-controlled voltage source converters (VSCs) connected to very weak grids, the interaction between the control dynamics and physical system is not completely ...

  • Evaluación de riesgos ocupacionales de los trabajadores de la minería española (2018) 

    Freijo Álvarez, Modesto; Sanmiquel Pera, Lluís; Montañá Puig, Juan; Romero Durán, David; Bergas Jané, Joan Gabriel (2020-10-01)
    Article
    Open Access
    El sector minero español puede clasificarse en dos tipos, minería energética y no energética. La actividad minera implica riesgos para la salud y seguridad en el trabajo.En este estudio se ha evaluado los ...

  • Impact of the ice thickness distribution discretization on the sea ice concentration variability in the NEMO3.6–LIM3 global ocean–sea ice model 

    Moreno Chamarro, Eduardo; Ortega Montilla, Pablo; Massonnet, François (Copernicus Publications, 2020-10-05)
    Article
    Open Access
    This study assesses the impact of different sea ice thickness distribution (ITD) discretizations on the sea ice concentration (SIC) variability in ocean stand-alone NEMO3.6–LIM3 simulations. Three ITD discretizations with ...

  • A low-cost multicomputer for teaching environments 

    Aliagas, Carles; García Famoso, Montserrat; Meseguer Pallarès, Roc; Millán Marco, Pere; Molina Clemente, Carlos Maria (2020-08)
    Article
    Open Access
    We propose a teaching resource that uses Hard Kernel boards to build an MPI server with 256 cores. Although this system has a relatively low performance, the aim is to provide access to hundreds of cores for carrying out ...

  • Damage detection and diagnosis for offshore wind foundations 

    Puruncajas Maza, Bryan; Vidal Seguí, Yolanda; Tutivén Gálvez, Christian (2020)
    Conference report
    Restricted access - publisher's policy
    Structural health monitoring for wind turbines (WT) in remote locations, as offshore, is crucial (Presencia and Shafiee, 2018). Offshore wind farms are increasingly realized in water depths beyond 30 meters, where lattice ...

  • Bounded queries to arbitrary sets 

    Lozano Bojados, Antoni (1991-09)
    External research report
    Open Access
    We prove that if P superA[k] = P superA[k+1] for some k and an arbitrary set A, then A is reducible to its complement under a relativized nondeterministic conjunctive reduction. This result shows the first known property ...

  • Finite-time stabilization of Chameleon hidden hyperchaotic flows 

    Reyhani, Arezoo; Mobayen, Saleh; Fekih, Afef; Pujol Vázquez, Gisela (2020)
    Conference report
    Restricted access - publisher's policy
    The Chameleon hidden chaotic system is a chaotic system with exciting and particular properties. One of its specific features is that by changing its constant parameters, the flow exhibits three classes of hidden attractors ...

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