Recent Submissions

  • Impact of a thermoelectric subcooler heat exchanger on a carbon dioxide transcritical refrigeration facility 

    Casi Satrústegui, Álvaro Upna Orcid; Aranguren Garacochea, Patricia Upna Orcid; Araiz Vega, Miguel Upna Orcid; Alegría Cía, Patricia; Astrain Ulibarrena, David Upna Orcid (Elsevier, 2022)   Artículo / Artikulua  OpenAccess
    To improve the performance of vapour compression refrigeration cycles, the inclusion of a thermoelectric subcooler for low-medium power units has been the focus of recent studies due to its robustness, compactness and ...
  • AC coupled amplifier with a resistance multiplier technique for ultra-low frequency operation 

    Martincorena Arraiza, Maite Upna Orcid; Cruz Blas, Carlos Aristóteles de la Upna Orcid; Carlosena García, Alfonso Upna Orcid; López Martín, Antonio Upna Orcid (Elsevier, 2022)   Artículo / Artikulua  OpenAccess
    This paper proposes a novel, tunable AC coupled capacitive feedback amplifier, exhibiting an ultra-low high pass corner frequency. This is accomplished by actively boosting the output resistive value of a MOS transistor ...
  • Along-the-path exponential integration for Floquet stability analysis of wind turbines 

    Ros Ganuza, Javier Upna Orcid; Olcoz Alonso, Álvaro; Plaza Puértolas, Aitor Upna Orcid (IOP Publishing, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Traditionally, stability assessment of wind turbines has been performed by eigenanalysis of the azimuthally-averaged linearized system after applying the Multi-Blade Coordinate (MBC) transformation. However, due to ...
  • A frequency reconfigurable compact planar inverted-F antenna for portable devices 

    Ghaffar, Adnan; Altaf, Ahsan; Aneja, Aayush; Li, Xue Jun; Khan, Salahuddin; Alibakhshikenari, Mohammad; Falcone Lanas, Francisco Javier Upna Orcid; Limiti, Ernesto (Hindawi, 2022)   Artículo / Artikulua  OpenAccess
    In this paper, a low-profile, compact size, inexpensive, and easily integrable frequency reconfigurable antenna system is proposed. The proposed antenna consists of an inverted-F shape antenna, capacitors, and switching ...
  • A compact CPW-fed ultra-wideband multi-input-multi-output (mimo) antenna for wireless communication networks 

    Ahmad, Sarosh; Khan, Shahid; Manzoor, Bilal; Soruri, Mohammad; Alibakhshikenari, Mohammad; Dalarsson, Mariana; Falcone Lanas, Francisco Javier Upna Orcid (IEEE, 2022)   Artículo / Artikulua  OpenAccess
    In this article, a compact coplanar waveguide (CPW) technique based ultra-wideband multiple-input-multiple-output (MIMO) antenna is proposed. The design is characterized by a broad impedance bandwidth starting from 3 GHz ...
  • Electromagnetic characterization of uhf-rfid fixed reader in healthcare centers related to the personal and labor health 

    Ramos, Victoria; Suarez, Oscar javier; Febles Santana, Víctor M.; Suarez Rodriguez, David samuel; Aguirre Gallego, Erik Upna Orcid; Miguel-Bilbao, Silvia de; Marina, Pablo; Rabassa Lopez Calleja, Luis Enrique; Celaya Echarri, Mikel; Falcone Lanas, Francisco Javier Upna Orcid; Hernandez Armas, Jose Ángel (IEEE, 2022)   Artículo / Artikulua  OpenAccess
    Hospitals and healthcare centers are experiencing a remarkable implementation of new systems based on wireless communications technologies. Many of these systems provide location services and identification of materials, ...
  • Self-referenced optical fiber sensor based on LSPR generated by gold and silver nanoparticles embedded in layer-by-layer nanostructured coatings 

    Martínez Hernández, María Elena Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Rivero Fuente, Pedro J. Upna Orcid; Sandúa Fernández, Xabier; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2022)   Artículo / Artikulua  OpenAccess
    In this work, an optical fiber sensor based on the localized surface plasmon resonance (LSPR) phenomenon has been designed for the detection of two different chemical species (mercury and hydrogen peroxide) by using ...
  • In situ synthesis of gold nanoparticles in layer-b y-layer polymeric coatings for the fabrication of optical fiber sensors 

    Martínez Hernández, María Elena Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Rivero Fuente, Pedro José; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2022)   Artículo / Artikulua  OpenAccess
    A new method is proposed to tune the interferometric response of wavelength-based optical fiber sensors. Using the nanoparticle in situ synthesis (ISS) technique, it is possible to synthesize gold nanoparticles (AuNPs) ...
  • Luminance calibration of a full sky HDR imaging system using sky scanner measurements 

    García Ruiz, Ignacio Upna Orcid; Sáenz Gamasa, Carlos Upna Orcid; Hernández Salueña, Begoña Upna Orcid; García Santos, Rafael Rogelio; Torres Escribano, José Luis Upna Orcid (Solar Energy Society, 2022)   Artículo / Artikulua  OpenAccess
    A full sky High Dynamic Range imaging system, based on a Single-Lens Reflex camera with a fisheye lens, has been constructed and calibrated with a sky scanner luminance meter. The method considers the geometrical, spectral, ...
  • A multi-object grasp technique for placement of objects in virtual reality 

    Fernández Ortega, Unai Javier; Elizondo Martinez, Sonia; Iriarte Cárdenas, Naroa; Morales, Rafael; Ortiz Nicolás, Amalia; Marichalar Baraibar, Sebastian Roberto; Ardaiz Villanueva, Óscar Upna Orcid; Marzo Pérez, Asier (MDPI, 2022)   Artículo / Artikulua  OpenAccess
    Some daily tasks involve grasping multiple objects in one hand and releasing them in a determined order, for example laying out a surgical table or distributing items on shelves. For training these tasks in Virtual Reality ...
  • Simulation model for wire harness design in the car production line optimization using the SimPy library 

    Guerrero, R.; Serrano Hernández, Adrián Upna Orcid; Pascual Cornago, Jose Antonio; Faulín Fajardo, Francisco Javier (MDPI, 2022)   Artículo / Artikulua  OpenAccess
    The automotive industry is one of the most important economic sectors in the world. At the beginning, vehicles only had mechanical components, so the use of an automotive wire harness was not indispensable. Cars today are ...
  • Mechanical sensitivity analysis of strain gauge configurations in the main shaft of wind turbines 

    Bacaicoa Díaz, Julen Upna Orcid; Iriarte Goñi, Xabier Upna Orcid; Aginaga García, Jokin Upna Orcid; Plaza Puértolas, Aitor Upna Orcid (IOP Publishing, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Wind turbines are reaching their remaining useful life, thus it is important to guarantee the well status of its components. A common way to check the status is to measure the loads on the Low Speed Shaft with strain gauges, ...
  • Lithium-ion battery model and experimental validation 

    Berrueta Irigoyen, Alberto Upna Orcid; Irigaray, Víctor; Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid (2015)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    A simple battery model is useful for: Sizing of the storage system for a particular application; Designing other elements connected to the battery; Managing the storage system operation. This poster consists on: Tests to ...
  • Hydrogen-lithium energy storage for a stand-alone microgrid 

    Berrueta Irigoyen, Alberto Upna Orcid; San Martín Biurrun, Idoia Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid (2016)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Sizing of the storage system for a stand-alone application: Satisfaction of technical requirements; Based on real data from an experimental microgrid; Long lifetime; Lowest price
  • Compensation of forecast error in large PV plants with battery storage: associated strategies 

    Marcos Álvarez, Javier Upna Orcid; Parra Laita, Íñigo de la Upna Orcid; Muñoz Escribano, Mikel Upna; García Solano, Miguel Upna Orcid; Marroyo Palomo, Luis Upna Orcid (2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    As penetration rates of utility-scale photovoltaics (PV) increases, large PV plants will participate in the daily wholesale electricity market in the same way that wind farms. Then, PV plant owner can receive some kind of ...
  • Integrating multiple stubs in stepped-impedance filter aiming for high selectivity 

    Sami, Abdul Upna; Gómez Laso, Miguel Ángel Upna Orcid; Lopetegui Beregaña, José María; Arnedo Gil, Israel; Calero Fernández, Ibai; Teberio Berdún, Fernando Upna Orcid; Martín Iglesias, Petronilo; Benito Pertusa, David Upna Orcid; Arregui Padilla, Iván Upna Orcid (IETWiley, 2022-05-24)   Artículo / Artikulua  OpenAccess
    A design technique to include multiple and fully-controlled transmission zeros (TZs) in the frequency response of rectangular waveguide commensurate-line stepped-impedance filters is presented in this letter. These bandpass ...
  • Gamification and a low-cost laboratory equipment aimed to boost vapor compresion refrigeration learning 

    Aranguren Garacochea, Patricia Upna Orcid; Sánchez García-Vacas, Daniel; Casi Satrústegui, Álvaro Upna Orcid; Araiz Vega, Miguel Upna Orcid; Catalán Ros, Leyre Upna Orcid (OmniaScience, 2022)   Artículo / Artikulua  OpenAccess
    The nowadays European educational framework boosts applying the learned theoretical concepts to real situations. Hence, practice sessions are key resources to present students direct applications of the theoretical concepts ...
  • Distributed opportunistic wireless mapping system towards smart city service provision 

    Villadangos Alonso, Jesús Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid; López Martín, Antonio Upna Orcid; Astrain Escola, José Javier Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2021)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    The knowledge of wireless signal distribution within an urban scenario can provide useful information to users as well as to enhance connectivity and device operation or to perform municipal logistics based on crowd density ...
  • Extension of restricted equivalence functions and similarity measures for type-2 fuzzy sets 

    Miguel Turullols, Laura de Upna Orcid; Santiago, Regivan; Wagner, Christian; Garibaldi, Jonathan M.; Takáč, Zdenko; Roldán López de Hierro, Antonio Francisco; Bustince Sola, Humberto Upna Orcid (IEEE, 2021)   Artículo / Artikulua
    In this work we generalize the notion of restricted equivalence function for type-2 fuzzy sets, leading to the notion of extended restricted equivalence functions. We also study how under suitable conditions, these new ...
  • Interval-valued aggregation functions based on moderate deviations applied to motor-imagery-based brain computer interface 

    Fumanal Idocin, Javier Upna Orcid; Takáč, Zdenko; Fernández Fernández, Francisco Javier Upna Orcid; Sanz Delgado, José Antonio; Goyena Baroja, Harkaitz; Lin, Chin-Teng; Wang, Yu-Kai; Bustince Sola, Humberto Upna Orcid (IEEE, 2021)   Artículo / Artikulua  OpenAccess
    In this work we develop moderate deviation functions to measure similarity and dissimilarity among a set of given interval-valued data to construct interval-valued aggregation functions, and we apply these functions in two ...

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