Now showing items 1-20 of 352

    • 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 ...
    • Network simulation in a TCP-enabled industrial internet of things environment - reproducibility issues for performance evaluation 

      Morató Osés, Daniel Upna Orcid; Pérez-Gómara, Carlos; Magaña Lizarrondo, Eduardo Upna Orcid; Izal Azcárate, Mikel Upna Orcid (IEEE, 2022)   Artículo / Artikulua  OpenAccess
      Network simulation is a tool used to analyse and predict the performance of Industrial Internet of Things deployments while dealing with the complexity of real testbeds. Large network deployments with complex protocols ...
    • High performance fiber laser resonator for dual band (C and L) sensing 

      Sánchez-González, Arturo; Pérez Herrera, Rosa Ana Upna Orcid; Roldán Varona, Pablo; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2022)   Artículo / Artikulua
      This work presents an experimental analysis and comparison of the performance of quasi-randomly distributed reflectors inscribed into a single-mode fiber as a sensing mirror both in C- and L-band. Single-wavelength emission ...
    • On some classes of nullnorms and h-pseudo homogeneity 

      Lima, Lucélia; Bedregal, Benjamin Upna Orcid; Rocha, Marcus; Castillo López, Aitor; Fernández Fernández, Francisco Javier Upna Orcid; Bustince Sola, Humberto Upna Orcid (Elsevier, 2022)   Artículo / Artikulua
      Nullnorms are aggregation functions which generalize t-norms and t-conorms. For each nullnorm there exists an annihilator element such that, below it, the function behaves like a t-conorm, and, above it, like a t-norm. ...
    • A comprehensive survey on 'circular polarized antennas' for existing and emerging wireless communication technologies 

      Nadeem, Iram; Alibakhshikenari, Mohammad; Babaeian, Fatemeh; Althuwayb, Ayman Abdulhadi; Virdee, Bal S.; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Khan, Salahuddin; Huynen, Isabelle; Falcone Lanas, Francisco Javier Upna Orcid; Denidni, Tayeb A.; Limiti, Ernesto (IOP Publishing, 2022)   Artículo / Artikulua  OpenAccess
      Circular polarized (CP) antennas are well suited for long-distance transmission attainment. In order to be adaptable for beyond 5G communication, a detailed and systematic investigation of their important conventional ...
    • 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, ...
    • Experimental demonstration of deeply subwavelength dielectric sensing with epsilon-near-zero (ENZ) waveguides 

      Beruete Díaz, Miguel Upna Orcid; Engheta, Nader; Pacheco-Peña, Víctor Upna Orcid (American Institute of Physics, 2022)   Artículo / Artikulua  OpenAccess
      In this Letter, an all metallic sensor based on ε-near-zero (ENZ) metamaterials is studied both numerically and experimentally when working at microwave frequencies. To emulate an ENZ medium, a sensor is made by using a ...
    • 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) ...
    • 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 ...
    • 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 ...
    • Fault detection of planetary gears based on signal space constellations 

      Martincorena Arraiza, Maite Upna Orcid; Cruz Blas, Carlos Aristóteles de la Upna Orcid; López Martín, Antonio Upna Orcid; Molina Vicuña, Cristian; Matías Maestro, Ignacio Upna Orcid (MDPI, 2022)   Artículo / Artikulua  OpenAccess
      A new method to process the vibration signal acquired by an accelerometer placed in a planetary gearbox housing is proposed, which is useful to detect potential faults. The method is based on the phenomenological model and ...
    • 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 ...
    • On the measurement of stability parameter over complex mountainous terrain 

      Cantero, Elena; Sanz, Javier; Borbón, Fernando; Paredes, Daniel; García, Almudena (Copernicus Publications, 2022)   Artículo / Artikulua  OpenAccess
      Atmospheric stability has a significant effect on wind shear and turbulence intensity, and these variables, in turn, have a direct impact on wind power production and loads on wind turbines. It is therefore important to ...
    • Network traffic analysis through node behaviour classification: a graph-based approach with temporal dissection and data-level preprocessing 

      Zola, Francesco; Segurola-Gil, L.; Bruse, Jan Lukas; Galar Idoate, Mikel Upna Orcid; Orduna Urrutia, Raúl Upna Orcid (Elsevier, 2022)   Artículo / Artikulua  OpenAccess
      Network traffic analysis is an important cybersecurity task, which helps to classify anomalous, potentially dangerous connections. In many cases, it is critical not only to detect individual malicious connections, but to ...
    • 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, ...
    • 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 ...
    • 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 ...
    • 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 ...
    • 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 ...