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Mostrando ítems 21-40 de 602

    • Enhanced behaviour of a passive thermoelectric generator with phase change heat exchangers and radiative cooling 

      Astrain Ulibarrena, David Upna Orcid; Jaramillo-Fernández, Juliana; Araiz Vega, Miguel Upna Orcid; Francone, Achille; Catalán Ros, Leyre Upna Orcid; Jacobo-Martín, Alejandra; Alegría Cía, Patricia; Sotomayor-Torres, Clivia M. (Elsevier, 2023)   Artículo / Artikulua  OpenAccess
      Heat exchangers are essential to optimize the efficiency of Thermoelectric Generators (TEGs), and heat pipes without fans have proven to be an advantageous design as it maintains the characteristic robustness of ...

    • On fuzzy implications derived from general overlap functions and their relation to other classes 

      Pinheiro, Jocivania; Santos, Helida; Pereira Dimuro, Graçaliz; Bedregal, Benjamin Upna Orcid; Santiago, Regivan; Fernández Fernández, Francisco Javier Upna Orcid; Bustince Sola, Humberto Upna Orcid (MDPI, 2023)   Artículo / Artikulua  OpenAccess
      There are distinct techniques to generate fuzzy implication functions. Despite most of them using the combination of associative aggregators and fuzzy negations, other connectives such as (general) overlap/grouping ...

    • Ultraviolet erythemal irradiance (UVER) under different sky conditions in Burgos, Spain: multilinear regression and artificial neural network models 

      García-Rodríguez, Sol; García-Rodríguez, Ana; Granados-López, D.; García Ruiz, Ignacio Upna Orcid; Alonso-Tristán, Cristina (MDPI, 2023)   Artículo / Artikulua  OpenAccess
      Different strategies for modeling Global Horizontal UltraViolet Erythemal irradiance (GHUVE) based on meteorological parameters measured in Burgos (Spain) have been developed. The experimental campaign ran from September ...

    • Moisture content estimation models of flour matrices in the 67-110 GHz frequency range using a nondestructive and contactless monitoring system 

      Quemada Mayoral, Carlos Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Gonzalo García, Ramón Upna Orcid; Iriarte Galarregui, Juan Carlos Upna Orcid (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      This work addresses the lack of moisture content estimation models for food products in the millimeter-wave frequency range and showcases the potential of this range for designing compact, cost-effective, and in-line food ...

    • A review of techniques to enhance an amplifier's performance using resistive local common mode feedback 

      Ramírez-Angulo, Jaime; López Martín, Antonio Upna Orcid; Carvajal, Ramón G.; Torralba, Antonio; Huerta-Chua, Jesús (MDPI, 2023)   Artículo / Artikulua  OpenAccess
      A review of some of the most common applications of the resistive local common mode feedback technique to enhance amplifier’s performance is presented. It is shown that this simple technique offers essential improvement ...

    • Combining radiative cooling and light trapping strategies for improved performance of PERC bifacial silicon solar cells 

      Urdiroz Urricelqui, Unai; Itoiz Goñi, Iñigo; Sevilla Moróder, Joaquín Upna Orcid; Andueza Unanua, Ángel María Upna Orcid (Elsevier, 2023)   Artículo / Artikulua  OpenAccess
      This work investigates the impact of combining light trapping and radiative cooling on bifacial solar panels. While several techniques have been proposed to enhance the efficiency of solar panels, their combination can ...

    • Resistance-capacitance thermal models as alternatives to finite-element numerical models in the simulation of thermoelectric modules for electric power generation 

      Martínez Echeverri, Álvaro Upna Orcid (Elsevier, 2023)   Artículo / Artikulua  OpenAccess
      This paper demonstrates that resistance–capacitance models provide equal results than models based on finiteelement software when predicting the performance of a thermoelectric module under transient-state conditions. Previous ...

    • Innovative approaches for organizing an inclusive optics and photonics conference in virtual format 

      Heras, Alba de las; Gómez-Varela, Ana Isabel; Tomás, María-Baralida; Pérez Herrera, Rosa Ana Upna Orcid; Sánchez, Luis Alberto; Gallazzi, Francesca; Santamaría, Beatriz; García Lechuga, Mario; Vinas María; Delgado Pinar, Martina; González Fernández, Verónica (MDPI, 2023)   Artículo / Artikulua  OpenAccess
      The COVID pandemic is forcing the renewal of scientific conferences, offering opportunities to introduce technological and inclusive developments. Our analysis focuses on the implementation of inclusive practices for female ...

    • Design of optical fiber Bragg grating-based sensors for flow measurement in pipes 

      Diéguez Elizondo, Pedro Upna Orcid; Rodríguez Rodríguez, Armando; Urroz Unzueta, José Carlos Upna Orcid; López Rodríguez, José Javier Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (Taylor & Francis, 2023)   Artículo / Artikulua  OpenAccess
      In this work, optical Fiber Bragg grating (FBG) sensors were used to measure water flow in pipes. Several types of coatings were incorporated into the design of the sensors to examine their effects on the elastic strain ...

    • All-fiber ellipsometer for nanoscale dielectric coatings 

      Imas González, José Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Del Villar, Ignacio Upna Orcid; Ozcariz Celaya, Aritz Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Albert, Jacques (Chinese Academy of Sciences, 2023)   Artículo / Artikulua  OpenAccess
      Multiple mode resonance shifts in tilted fiber Bragg gratings (TFBGs) are used to simultaneously measure the thickness and the refractive index of TiO2 thin films formed by Atomic Layer Deposition (ALD) on optical fibers. ...

    • Electrochemical lossy mode resonance for the detection of manganese ions 

      Domínguez Rodríguez, Ismel Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Del Villar, Ignacio Upna Orcid; Mozo, Juan D.; Simerova, Radka; Sezemsky, Petr; Stranak, Vitezslav; Śmietana, Mateusz; Matías Maestro, Ignacio Upna Orcid (Elsevier, 2023)   Artículo / Artikulua  OpenAccess
      In this work we propose electrochemical lossy mode resonance (eLMR) as a powerful method for the detection of manganese (Mn) ions. The sensor is based on a simple planar waveguide (sodasingle bondlime glass coverslip) ...

    • UV light detection with side polished CYTOP fiber 

      Ayechu Abendaño, Ada; Santano, Desiree Upna Orcid; López Vargas, Juan David; Matías Maestro, Ignacio Upna Orcid; Del Villar, Ignacio Upna Orcid (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      Cyclic transparent optical polymer (CYTOP) fiber, used mainly in strain detection and refractive index characterization of liquids, can be polished for the detection of ultraviolet (UV) light radiation. The study investigates ...

    • LMR-based optical sensor for ethylene detection at visible and mid-infrared regions 

      Gallego Martínez, Elieser Ernesto; Hualde Otamendi, Mikel; Ruiz Zamarreño, Carlos Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      Ethylene monitoring has long been a method of controlling the ripening of climacteric fruits, but it turns out that this gas is an important biomarker in biomedical applications. This work presents an optical gas sensor ...

    • Generalizing max pooling via (a, b)-grouping functions for convolutional neural networks 

      Rodríguez Martínez, Iosu Upna Orcid; Asmus, Tiago Upna Orcid; Pereira Dimuro, Graçaliz Upna Orcid; Herrera, Francisco; Takáč, Zdenko; Bustince Sola, Humberto Upna Orcid (Elsevier, 2023)   Artículo / Artikulua  OpenAccess
      Due to their high adaptability to varied settings and effective optimization algorithm, Convolutional Neural Networks (CNNs) have set the state-of-the-art on image processing jobs for the previous decade. CNNs work in a ...

    • Monitoring structural transformations in metamagnetic shape memory alloys by non-contact GMI technology 

      Beato López, Juan Jesús Upna Orcid; La Roca, Paulo Matías Upna; Algueta-Miguel, Jose M. Upna Orcid; Garayo Urabayen, Eneko Upna Orcid; Sánchez-Alarcos Gómez, Vicente Upna Orcid; Recarte Callado, Vicente Upna Orcid; Gómez Polo, Cristina Upna Orcid; Pérez de Landazábal Berganzo, José Ignacio Upna Orcid (IOP Publishing, 2023)   Artículo / Artikulua
      Different applications based on metamagnetic shape memory alloy (MSMA) require monitoring the evolution of the martensitic transformation (MT) to optimize the actuation mechanism. To avoid interaction with the active ...

    • Ammonia gas optical sensor based on lossy mode resonances 

      Armas, Dayron; Zubiate Orzanco, Pablo Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      This letter presents the fabrication and characterization of an ammonia (NH 3) gas optical sensor based on lossy mode resonances (LMRs). A chromium (III) oxide (Cr 2 O 3) thin film deposited onto a planar waveguide was ...

    • An enhanced approach to virtually increase quasi-stationarity regions within geometric channel models for vehicular communications 

      Rodríguez Corbo, Fidel Alejandro; Celaya Echarri, Mikel Upna Orcid; Shubair, Raed M.; Falcone Lanas, Francisco Javier Upna Orcid; Azpilicueta Fernández de las Heras, Leyre Upna Orcid (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      Vehicular communication channels are intrinsically non-stationary, as they present high mobility and abundant dynamic scatterers. Quasi-stationary regions can assess the degree of non-stationarity within a determined ...

    • Planar-waveguide-lmr-based sensors: engineering the depth of characteristic curves 

      Shrivastav, Anand M.; Del Villar, Ignacio Upna Orcid; Ascorbe Muruzabal, Joaquín Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      Lossy mode resonance (LMR)-based sensors have been proven as one of the exponentially growing research fields since the last decade. These sensors have demonstrated their capabilities in the detection of several physical, ...

    • Highly sensitive sensor for measuring material thermal expansion using a ring laser 

      Díaz Lucas, Silvia Upna Orcid; Fuentes Lorenzo, Omar Upna; Torres Betancourt, Angie Tatiana; Corres Sanz, Jesús María Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      A new thermal expansion sensor is presented in this letter. It combines an interferometric fiber sensor and an erbium-doped fiber ring laser as the light source. The sensor consists of a combination of single-mode, ...

    • Quantum antireflection temporal coatings: quantum state frequency shifting and inhibited thermal noise amplification 

      Liberal Olleta, Íñigo Upna Orcid; Vázquez Lozano, Juan Enrique; Pacheco-Peña, Víctor Upna Orcid (wiley, 2023)   Artículo / Artikulua  OpenAccess
      The quantum optical response of antireflection temporal coatings (ATCs), that is, matching temporal layers that suppress the generation of backward waves in temporal boundaries, is investigated. The results reveal that ...
      El Repositorio ha recibido la ayuda de la Fundación Española para la Ciencia y la Tecnología para la realización de actividades en el ámbito del fomento de la investigación científica de excelencia, en la Línea 2. Repositorios institucionales (convocatoria 2020-2021).
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