Now showing items 1-20 of 154

    • Aluminum coated fiber optic sensor for enhancing flow rate measurement 

      Rodríguez Rodríguez, Armando; Urroz Unzueta, José Carlos Upna Orcid; Diéguez Elizondo, Pedro Upna Orcid; Bravo Acha, Mikel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; López Rodríguez, José Javier Upna Orcid (SPIE, 2023)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A water flow and velocity aluminum-coated Fiber Bragg Grating sensor system for open channels was designed, simulated and tested. The sensing head was designed, ruggedized and customized to measure velocities at ...
    • Low-voltage CMOS bulk-driven buffer with bootstrapping technique for gain enhancement and THD-noise reduction 

      Cruz Blas, Carlos Aristóteles de la Upna Orcid; Carrillo, Juan M. (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this paper, a bootstrapping technique is applied to a bulk-driven voltage buffer for canceling the gate-source transconductance in order to improve the cell gain, the linearity and reduce the input-referred noise. The ...
    • Multipactor breakdown analysis of Ku-band meandered low-pass filter 

      Sami, Abdul Upna; Teberio Berdún, Fernando Upna Orcid; Arnedo Gil, Israel; Martín Iglesias,  Petronilo; Lopetegui Beregaña, José María; Gómez Laso, Miguel Ángel Upna Orcid; Arregui Padilla, Iván Upna Orcid (2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, a very compact rectangular waveguide low-pass filter with meandered topology based on commensurate lines for Ku-band satellite applications is analysed for high-power handling capabilities. The device consists ...
    • Control strategy for a droop-controlled grid-connected DFIG wind turbine 

      Oraá Iribarren, Iker; Samanes Pascual, Javier Upna Orcid; López Taberna, Jesús Upna Orcid; Gubía Villabona, Eugenio Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The application of droop control techniques without inner current control loops to doubly-fed induction generator (DFIG) based wind turbines does not allow to provide a stable response at all operating points in terms of ...
    • Comparison of a slotted SIW antenna covered with metasurface vs. a traditional array 

      Chocarro Álvarez, Javier; Pérez Escudero, José Manuel Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this article we compare two solutions to improve the radiation pattern of a slotted Substrate Integrated Waveguide (SIW) antenna: use of an E-plane array and covering it with a metasurface (MTS). To this aim, we compare ...
    • Filtro paso banda en tecnología groove gap waveguide con altura de pines reducida para facilitar su fabricación 

      Santiago Arriazu, David; Gómez Laso, Miguel Ángel Upna Orcid; Lopetegui Beregaña, José María; Arregui Padilla, Iván Upna Orcid (Universidad de Málaga, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this work, a novel topology of groove gap waveguide (GGW) technology is presented to facilitate the fabrication process by Computer Numerical Control (CNC) milling. GGW has been proposed as an interesting alternative ...
    • Alfalfa quality detection by means of VIS-NIR optical fiber reflection spectroscopy 

      Ruiz Zamarreño, Carlos Upna Orcid; Gracia Moisés, Ander; Vitoria Pascual, Ignacio Upna Orcid; Imas González, José Javier Upna Orcid; Castaño Egues, Lorena Yveth; Avedillo, A.; Matías Maestro, Ignacio Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      A first approach study for the classification of alfalfa (medicago sativa) quality has been performed by means of VIS-NIR optical fiber reflection spectroscopy. Reflection spectral data has been obtained from alfalfa samples ...
    • Long-range and high-resolution traffic monitoring based on pulse-compression DAS and advanced vehicle tracking algorithm 

      Corera Orzanco, Íñigo Upna Orcid; Piñeiro Ben, Enrique; Navallas Irujo, Javier; Sagüés García, Mikel Upna Orcid; Loayssa Lara, Alayn (Optica Publishing Group, 2022)   Contribución a congreso / Biltzarrerako ekarpena
      We demonstrate traffic monitoring over tens of kilometres of road using an enhanced distributed acoustic sensing system based on optical pulse compression and a novel transformed-domain-based processing scheme with enhanced ...
    • Bloch surface wave resonances generated with dielectric stack of high refractive index contrast deposited on a D-shaped optical fiber for sensing applications 

      Del Villar, Ignacio Upna Orcid; Kwietniewski, Norbert; Gonzalez-Valencia, Esteban; Burnat, Dariusz; Armas, Dayron; Pitula, Emil; Matías Maestro, Ignacio Upna Orcid; Chiavaioli, Francesco; Torres, Pedro; Smietana, Mateusz (Optica Publishing Group, 2022)   Contribución a congreso / Biltzarrerako ekarpena
      A 5-layer stack composed of TiO2 and Al2O3, two materials with a high refractive index contrast, was deposited on a D-shaped fiber to generate Bloch surface wave resonances with an improved figure of merit.
    • Quasi-distributed vibration analysis of a cantilever beam using OFDR and weak reflectors 

      Leandro González, Daniel Upna Orcid; Zhu, Mengshi; Wada, Daichi; Kasai, Tokio; Igawa, Hirotaka; López-Amo Sáinz, Manuel Upna Orcid; Murayama, Hideaki (Optica Publishing Group, 2022)   Contribución a congreso / Biltzarrerako ekarpena
      This work evaluates the performance of a quasi-distributed in-line velocimeter based on OFDR and weak reflectors to measure vibration every 10 cm, using a cantilever beam under free-end damping and during an impact-hammer test.
    • Compensation of phase-noise in pulse-compression phase-sensitive OTDR sensors 

      Piñeiro Ben, Enrique; Sagüés García, Mikel Upna Orcid; Eyal, Avishay; Loayssa Lara, Alayn (Optica Publishing Group, 2022)   Contribución a congreso / Biltzarrerako ekarpena
      We introduce a technique to compensate the performance impairments due to the laser phase noise in long-range pulse-compression DAS sensors. Experiments demonstrate the use of the longest duration pulse compression waveform ...
    • Narrowband and spectrally robust thermal emission from metallic thin films on top of epsilon-near-zero substrates 

      Navajas Hernández, David Upna; Pérez Escudero, José Manuel Upna Orcid; Liberal Olleta, Íñigo Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The absorption and emission of infrared radiation by ultra-thin metallic films is a key element in several thermal engineering applications such as heat and energy management, and thermal camouflage. However, ultra-thin ...
    • Noise in coherently radiating periodic structures beam forming networks 

      Biurrun Quel, Carlos Upna Orcid; Río Bocio, Carlos del Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Following the noise wave theory, beam forming networks based on Coherently Radiating Periodic Structures (CORPS-BFN) are analysed and proven to be capable of enhancing the Signal to Noise Ratio of the system by analogically ...
    • Development of a water flow and velocity optical fiber sensor for field testing 

      Rodríguez Rodríguez, Armando; Urroz Unzueta, José Carlos Upna Orcid; Diéguez Elizondo, Pedro Upna Orcid; Bravo Acha, Mikel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; López Rodríguez, José Javier Upna Orcid (Optica Publishing Group, 2022)   Contribución a congreso / Biltzarrerako ekarpena
      A water flow and velocity fiber optic sensor system was developed and tested. The sensing head was especially developed and ruggedized to measure velocities at different depths, in order to calculate the discharge in channels.
    • f-HybridMem: a consensual analysis via fuzzy consensus measures and penalty functions 

      Oliveira, Lizandro de Souza; Yamin, Adenauer; Reiser, Renata; Santos, Helida (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper considers the consensual analysis in decision-making (CDM) processes based on fuzzy logic (FL) and interval-valued fuzzy logic (IVFL), providing a CDM-strategy, by exploring the axiomatic properties of fuzzy ...
    • Generalization of QL-operators based on general overlap and general grouping functions 

      Botelho, Cecilia; Galvao, Alessandra; Santos, Helida; Pinheiro, Jocivania; Bedregal, Benjamin Upna Orcid; Yamin, Adenauer; Reiser, Renata (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Firstly, this work discusses the main conditions guarantying that general overlap (grouping) functions can be obtained from n-dimensional overlap (grouping) functions. Focusing on QL-implications, which are usually ...
    • Modelling and operation of 6-pulse thyristor rectifiers for supplying high power electrolyzers 

      Iribarren Zabalegui, Álvaro Upna; Barrios Rípodas, Ernesto Upna Orcid; Ibaiondo, Harkaitz; Sánchez Ruiz, Alain; Arza, Joseba; Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper presents a detailed analysis of a 6-pulse thyristor rectifier aimed at supplying high power electrolyzers. For this purpose, an analytical model of the three-phase controlled rectifier with AC-side inductance ...
    • Design alternatives for a submm-wave Fabry-Perot cavity antenna 

      Platero Rodrigo, Naiara; Iriarte Galarregui, Juan Carlos Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      This paper discusses different design alternatives for a high gain planar antenna at 240 GHz. The antenna is based on a Fabry-Perot configuration, where two different partial reflection surfaces (PRS) are considered: a ...
    • Compact pillbox reflector based on geodesic lens 

      Pérez Quintana, Dayan; Chen, Q.; Beruete Díaz, Miguel Upna Orcid; Quevedo-Teruel, O. (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      We propose a pillbox antenna in combination with a geodesic lens at 60 GHz. The antenna is implemented in a dual-layer parallel plate waveguide. The waves from a geodesic lens in a first layer, after being reflected by a ...
    • Integration of second-life batteries in residential microgrids and fast charging stations 

      San Martín Biurrun, Idoia Upna Orcid; Braco Sola, Elisa Upna; Martín Castilla, Álvaro; Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid (IEEE, 2022)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      The potential of batteries from electric vehicles to be given a second life in stationary applications could be starting to become a reality in few years. However, the technical and economic feasibility of such second-life ...