Recent Submissions

  • Wavelength converter using a highly Er-doped optical fiber ring laser 

    Pérez Herrera, Rosa Ana Upna; López-Amo Sáinz, Manuel Upna; Rodríguez, Luis; Ventura Rípodas, Daniel; López Higuera, José Miguel (IOP Publishing, 2018)   Artículo / Artikulua  OpenAccess
    This work presents an all-fiber wavelength converter based on a highly Er-doped fiber laser, which has been experimentally demonstrated. Frequencies from several kilohertz up to tens of gigahertz have been investigated. ...
  • Quantum antenna arrays: the role of quantum interference on direction-dependent photon statistics 

    Liberal Olleta, Íñigo Upna; Ederra Urzainqui, Íñigo Upna; Ziolkowski, Richard W. (American Physical Society, 2018)   Artículo / Artikulua  OpenAccess
    We investigate the role of quantum interference phenomena on the characteristics of the fields radiated by an array of quantum emitters. In analogy to, but distinct from, classical outcomes, we demonstrate that the array ...
  • Managing transportation externalities in the Pyrenees region: measuring the willingness-to-pay for road freight noise reduction using an experimental auction mechanism 

    Denant-Boemont, Laurent; Faulín Fajardo, Javier Upna; Hammiche, Sabrina; Serrano Hernández, Adrián Upna (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
    The estimation of the noise impact caused by road freight transportation is critical to have acknowledgment of the ambiance pollution caused by road traffic crossing geographical areas containing important natural resources. ...
  • Real-time imaging with frequency scanning array antenna for industrial inspection applications at W band 

    Larumbe Gonzalo, Belén Upna; Laviada, Jaime; Ibáñez Loinaz, Asier; Teniente Vallinas, Jorge Upna (Springer, 2018)   Artículo / Artikulua  OpenAccess
    A real-time imaging system based on a frequency scanning antenna for conveyor belt setups is presented in this paper. The frequency scanning antenna together with an inexpensive parabolic reflector operates at the W band ...
  • Computational study of geothermal thermoelectric generators with phase change heat exchangers 

    Catalán Ros, Leyre Upna; Araiz Vega, Miguel Upna; Aranguren Garacochea, Patricia Upna; Astrain Ulibarrena, David Upna (Elsevier, 2020)   Artículo / Artikulua
    The use of thermoelectric generators with phase change heat exchangers has demonstrated to be an interesting and environmentally friendly alternative to enhanced geothermal systems (EGS) in shallow hot dry rock fields ...
  • Prospects of autonomous volcanic monitoring stations: experimental investigation on thermoelectric generation from fumaroles 

    Catalán Ros, Leyre Upna; Araiz Vega, Miguel Upna; Padilla, Germán D.; Hernández, Pedro A.; Pérez, Nemesio M.; García de la Noceda, Celestino; Albert, José F.; Astrain Ulibarrena, David Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
    Fumaroles represent evidence of volcanic activity, emitting steam and volcanic gases at temperatures between 70 and 100 °C. Due to the well-known advantages of thermoelectricity, such as reliability, reduced maintenance ...
  • The importance of the assembly in thermoelectric generators 

    Araiz Vega, Miguel Upna; Catalán Ros, Leyre Upna; Herrero Mola, Óscar; Pérez Artieda, Miren Gurutze Upna; Rodríguez García, Antonio (IntechOpen, 2018)   Capítulo de libro / Liburuen kapitulua  OpenAccess
    Generally, in the optimization of thermoelectric generators, only the heat exchangers or the thermoelectric modules themselves are taken into account. However, the assembly of the generator as a whole is of vital importance ...
  • Experimental evidence of the viability of thermoelectric generators to power volcanic monitoring stations 

    Catalán Ros, Leyre Upna; Garacochea Sáenz, Amaia; Casi Satrústegui, Álvaro Upna; Araiz Vega, Miguel Upna; Aranguren Garacochea, Patricia Upna; Astrain Ulibarrena, David Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
    Although there is an important lack of commercial thermoelectric applications mainly due to their low efficiency, there exist some cases in which thermoelectric generators are the best option thanks to their well-known ...
  • Ultrathin sub-terahertz half-wave plate with high conversion efficiency based on zigzag metasurface 

    Moreno-Peñarrubia, Alexia; Kuznetsov, Sergei A.; Beruete Díaz, Miguel Upna (IEEE, 2020)   Artículo / Artikulua
    In this communication, an ultrathin transmissive half-wave plate (HWP) based on a bi-layered zigzag metasurface operating at the lower frequency edge of the terahertz (THz) spectrum is numerically and experimentally studied. ...
  • A decision tree based approach with sampling techniques to predict the survival status of poly-trauma patients 

    Sanz Delgado, José Antonio Upna; Fernández Fernández, Francisco Javier Upna; Bustince Sola, Humberto Upna; Gradin Purroy, Carlos; Belzunegui Otano, Tomás Upna (Atlantis Press, 2017)   Artículo / Artikulua  OpenAccess
    Survival prediction of poly-trauma patients measure the quality of emergency services by comparing their predictions with the real outcomes. The aim of this paper is to tackle this problem applying C4.5 since it achieves ...
  • Construction of capacities from overlap indexes 

    Sanz Delgado, José Antonio Upna; Galar Idoate, Mikel Upna; Mesiar, Radko; Bustince Sola, Humberto Upna; Fernández Fernández, Francisco Javier Upna (Springer, 2017)   Capítulo de libro / Liburuen kapitulua  OpenAccess
    In this chapter, we show how the concepts of overlap function and overlap index can be used to define fuzzy measures which depend on the specific data of each considered problem.
  • Quasi-distributed vibration sensing based on weak reflectors and STFT demodulation 

    Leandro González, Daniel Upna; Zhu, Mengshi; López-Amo Sáinz, Manuel Upna; Muruyama, Hideaki (IEEE, 2020)   Artículo / Artikulua
    In this work, a new system is proposed for quasi-distributed vibration sensing based on the Doppler effect. The setup employs an optical frequency domain reflectometer (OFDR) and an array of weak reflectors. The short-time ...
  • Simultaneous measurement of humidity and temperature based on a partially coated optical fiber long period grating 

    Urrutia Azcona, Aitor Upna; Goicoechea Fernández, Javier Upna; Ricchiuti, Amelia L.; Barrera, D.; Arregui San Martín, Francisco Javier Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
    A humidity and temperature optical fiber sensor based on a long-period grating (LPG), which can provide simultaneous response to both magnitudes, is proposed and demonstrated via experiments. Previously, the LPG was fully ...
  • Comprehensive analysis of photonic nanojets in 3D dielectric cuboids excited by surface plasmons 

    Pacheco Peña, Víctor Upna; Minin, Igor V.; Minin, Oleg V.; Beruete Díaz, Miguel Upna (Wiley, 2016)   Artículo / Artikulua  OpenAccess
    In this paper we study the excitation of photonic nanojets (PNJ) in 3D dielectric cuboids by surface plasmons at telecommunication wavelengths. The analysis is done using the effective refractive index approach. It is shown ...
  • Tripod-loop metasurfaces for terahertz-sensing applications: a comparison 

    Jáuregui-López, Irati Upna; Orazbayev, Bakhtiyar Upna; Pacheco-Peña, Víctor Upna; Beruete Díaz, Miguel Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
    The high electric field intensity achieved on the surface of sensors based on metasurfaces (metasensors) makes them an excellent alternative for sensing applications where the volume of the sample to be identified is tiny ...
  • Methodology to assess the impact of the introduction of new technologies in smart cities 

    Branchi, Pablo Emilio Upna; Fernández Valdivielso, Carlos Upna; Matías Maestro, Ignacio Upna (Federación de Asociaciones de Ingenieros Industriales de España, 2015)   Artículo / Artikulua
    Estamos frente a una revolución producto de los sistemas digitales y de comunicación, donde el papel de la tecnología continuará creciendo exponencialmente. Está calando profundamente en la sociedad, y tiene un alto impacto ...
  • Compact groove diamond antenna in gap waveguide technology with broadband circular polarization at millimeter waves 

    Pérez, Dayan; Torres-García, Alicia Upna; Ederra Urzainqui, Íñigo Upna; Beruete Díaz, Miguel Upna (IEEE, 2020)   Artículo / Artikulua
    In this paper, three compact antennas using the Ridge Gap Waveguide (RGW) technology working in the millimeter-wave band (60 GHz), with a high-purity and broadband circular polarization (CP) are numerically and experimentally ...
  • Design and empirical validation of a Bluetooth 5 fog computing based industrial CPS architecture for intelligent industry 4.0 shipyard workshops 

    Fraga Lamas, Paula; López Iturri, Peio Upna; Celaya Echarri, Mikel; Blanco Novoa, Óscar; Azpilicueta Fernández de las Heras, Leyre Upna; Varela Barbeito, José; Falcone Lanas, Francisco Javier Upna; Fernández Caramés, Tiago M. (IEEE, 2020)   Artículo / Artikulua  OpenAccess
    Navantia, one of largest European shipbuilders, is creating a fog computing based Industrial Cyber-Physical System (ICPS) for monitoring in real-time its pipe workshops in order to track pipes and keep their traceability. ...
  • A biased-randomized learnheuristic for solving the team orienteering problem with dynamic rewards 

    Reyes-Rubiano, Lorena Silvana; Juan, Ángel Alejandro; Bayliss, C.; Panadero, J.; Faulín Fajardo, Javier Upna; Copado, P. (Elsevier, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    In this paper we discuss the team orienteering problem (TOP) with dynamic inputs. In the static version of the TOP, a fixed reward is obtained after visiting each node. Hence, given a limited fleet of vehicles and a threshold ...
  • Low-voltage 0.81mW, 1-32 CMOS VGA with 5% bandwidth variations and -38dB DC rejection 

    López Martín, Antonio Upna; Rico-Aniles, Héctor Daniel; Ramírez-Angulo, Jaime; Rocha-Pérez, José Miguel; González Carvajal, Ramón (IEEE, 2020)   Artículo / Artikulua  OpenAccess
    A CMOS low-voltage amplifier with approximately constant bandwidth and DC rejection is introduced. The design is based on the cascade of a wide linear input range OTA, an op-amp and a servo-loop with extremely large time ...

View more