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    • Diagnostic and prognostic potential of multiparametric renal MRI in Kidney transplant patients 

      Echeverría Chasco, Rebeca; Martín Moreno, Paloma L.; Aramendía Vidaurreta, Verónica; García-Ruiz, Leyre; Mora-Gutiérrez, José María; Vidorreta Díaz de Cerio, Marta; Villanueva Larre, Arantxa Upna Orcid; Cano, David; Bastarrika, Gorka; García Fernández, Nuria; Fernández Seara, María A. (Wiley, 2024)   Artículo / Artikulua  OpenAccess
      Background: Multiparametric MRI provides assessment of functional and structural parameters in kidney allografts. Itoffers a non-invasive alternative to the current reference standard of kidney biopsy. Purpose: To evaluate ...

    • Generation of lossy mode resonances (LMR) using perovskite nanofilms 

      Armas, Dayron; Matías Maestro, Ignacio Upna Orcid; López-González, M. Carmen; Ruiz Zamarreño, Carlos Upna Orcid; Zubiate Orzanco, Pablo Upna Orcid; Del Villar, Ignacio Upna Orcid; Romero, Beatriz (Chinese Academy of Sciences, 2024)   Artículo / Artikulua  OpenAccess
      The results presented here show for the first time the experimental demonstration of the fabrication of lossy mode resonance (LMR) devices based on perovskite coatings deposited on planar waveguides. Perovskite thin films ...

    • Ultrahigh refractive index sensitivity with lossy mode resonance in a side-polished low-index polymer optical fiber 

      López Vargas, Juan David; Matías Maestro, Ignacio Upna Orcid; Werneck, Marcelo M.; Allil, Regina C.; Del Villar, Ignacio Upna Orcid (IEEE, 2024)   Artículo / Artikulua  OpenAccess
      This work presents a theoretical–experimental study of a refractive index (RI) sensor based on lossy mode resonances (LMRs) generated with a side-polished low-index polymer optical fiber. The theoretical part involves ...

    • Photoisomerization-induced LMR shift for UV radiation detection 

      Gallego Martínez, Elieser Ernesto; Ruiz Zamarreño, Carlos Upna Orcid; Matías Maestro, Ignacio Upna Orcid (Elsevier, 2024)   Artículo / Artikulua
      This work presents an optical sensor for ultraviolet radiation (UV) detection, based on the combined effects of Lossy Mode Resonance (LMR) in the mid infrared (MIR) spectral region and the photoisomerization of a polymeric ...

    • From fundamental materials chemistry to sensing applications: unravelling the water adsorption mechanism of a luminescent optical fibre sensor membrane 

      Cruz Quesada, Guillermo Upna Orcid; Rosales Reina, Beatriz; López Torres, Diego Upna Orcid; Reinoso, Santiago Upna Orcid; López Ramón, María Victoria; Arzamendi Manterola, María Cruz Upna Orcid; Elosúa Aguado, César Upna Orcid; Espinal Viguri, Maialen Upna Orcid; Garrido Segovia, Julián José Upna Orcid (Elsevier, 2024)   Artículo / Artikulua  OpenAccess
      This work provides insight into the correlation between the luminescent response of a water-vapour optical fibre sensor and the textural properties of its lanthanide-doped silica coating. To this end, a library of 16 silica ...

    • On the characterization of lithium-ion batteries under overtemperature and overcharge conditions: identification of abuse areas and experimental validation 

      Lalinde Sainz, Iñaki; Berrueta Irigoyen, Alberto Upna Orcid; Arza, Joseba; Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid (Elsevier, 2024)   Artículo / Artikulua  OpenAccess
      Although lithium-ion batteries have gained considerable popularity in renewable energy and electric vehicle applications, their safety still remains a concern under certain voltage, temperature, or state of charge conditions. ...

    • IIoT low-cost Zigbee-based WSN implementation for enhanced production efficiency in a solar protection curtains manufacturing workshop 

      Klaina, Hicham Upna; Picallo Guembe, Imanol Upna Orcid; López Iturri, Peio Upna Orcid; Biurrun, Aitor; Alejos, Ana; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Socorro Leránoz, Abián Bentor Upna Orcid; Falcone Lanas, Francisco Upna Orcid (MDPI, 2024)   Artículo / Artikulua  OpenAccess
      Nowadays, the Industry 4.0 concept and the Industrial Internet of Things (IIoT) are considered essential for the implementation of automated manufacturing processes across various industrial settings. In this regard, ...

    • Ag@Fe3O4-coated U-shaped plastic optical fiber sensor for H2S detection 

      López Vargas, Juan David; Dante, Alex; Allil, Regina C.; Del Villar, Ignacio Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Werneck, Marcelo M. (Elsevier, 2024)   Artículo / Artikulua
      This work presents the fabrication of U-shaped plastic optical fiber (POF) sensors for hydrogen sulfide (H2S) detection, coated with Fe3O4 nanoparticles synthetized using the Pulsed Laser Ablation in Liquid (PLAL) technique. ...

    • UAVradio: Radio link path loss estimation for UAVs 

      Aláez Gómez, Daniel; Celaya Echarri, Mikel; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Villadangos Alonso, Jesús Upna Orcid (Elsevier, 2024)   Artículo / Artikulua  OpenAccess
      The UAVRadio Python module is a comprehensive toolkit designed to facilitate the analysis and prediction of radio signal path loss in Unmanned Aerial Vehicle (UAV) communication scenarios. The module encompasses a range ...

    • Non-linear GMI decoding in 3D printed magnetic encoded systems 

      Beato López, Juan Jesús Upna Orcid; Algueta-Miguel, Jose M. Upna Orcid; Galarreta Rodríguez, Itziar; Garayo Urabayen, Eneko Upna Orcid; López Ortega, Alberto Upna Orcid; Gómez Polo, Cristina Upna Orcid; Pérez de Landazábal Berganzo, José Ignacio Upna Orcid (Elsevier, 2023)   Artículo / Artikulua  OpenAccess
      The nonlinear giant magnetoimpedance (GMI) effect was explored as a highly sensitive sensing technology in 3D-printed magnetic encoded systems. Magnetic nanoparticles with low (magnetite, Fe3O4) and high (Co ferrite, ...

    • Enhancement of the peak power handling capability in microstrip filters by employing smooth-profiled conductor strips 

      Ahmad, Jamil; Hussain, Jabir; Arregui Padilla, Iván Upna Orcid; Martin-Iglesias, Petronilo; Arnedo Gil, Israel; Gómez Laso, Miguel Ángel Upna Orcid; Lopetegui Beregaña, José María (2023)   Artículo / Artikulua  OpenAccess
      This paper presents a design methodology that significantly increases the peak power handling capability (PPHC) of microstrip filters. The PPHC is limited in microstrip technology by the corona effect: a physical phenomenon ...

    • Conductance-frequency droop control to ensure transient stability of inverter-based stand-alone microgrids 

      Erdocia Zabala, Ioseba Upna; Urtasun Erburu, Andoni Upna Orcid; Marroyo Palomo, Luis Upna Orcid (Elsevier, 2023)   Artículo / Artikulua  OpenAccess
      Currently, inverter-based stand-alone microgrids are gaining interest due to the advantages of obtaining energy from renewable sources. To manage the operation, these microgrids include storage systems connected in ...

    • Piezotronic, ZnO overlaid Bragg grating organic vapor sensors 

      López Torres, Diego Upna Orcid; Elosúa Aguado, César Upna Orcid; Pappas, Georgios A.; Konstantaki, María; Klini, Argyro; Lappas, Alexandros; Arregui San Martín, Francisco Javier Upna Orcid; Pissadakis, Stavros (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      We present a zinc oxide (ZnO) out-cladding, overlaid optical fiber Bragg grating sensor, for the detection of vapors of common alcohols and acetone at concentrations lower than 25 ppm while operating at room temperature ...

    • Defining and scoping participatory health informatics - an eDelphi study 

      Denecke, Kerstin; Rivera Romero, Octavio; Petersen, Carolyn; Benham-Hutchins, Marge; Cabrer, Miguel; Davies, Shauna; Grainger, Rebecca; Hussein, Rada; López-Campos, Guillermo; Martín-Sánchez, Fernando; Mckillop, Mollie; Merolli, Mark; Miron-Shatz, Talya; Trigo Vilaseca, Jesús Daniel Upna Orcid; Wright, Graham; Wynn, Rolf; Hullin, Carol; Gabarron, Elia (Georg Thieme Verlag, 2023)   Artículo / Artikulua  OpenAccess
      Background Health care has evolved to support the involvement of individuals in decision making by, for example, using mobile apps and wearables that may help empower people to actively participate in their treatment and ...

    • Evaluating noise in passive beam forming networks for multibeam applications 

      Biurrun Quel, Carlos Upna Orcid; Río Bocio, Carlos del Upna Orcid (Elsevier, 2023)   Artículo / Artikulua  OpenAccess
      In this work, we identify that the analysis in terms of noise of multibeam passive beam forming networks requires a proper formulation, in order not to overestimate the noise generated by the network. We show that the ...

    • Zero-loss switching in LLC resonant converters under discontinuous conduction mode: analysis and design methodology 

      Elizondo Martínez, David Upna Orcid; Barrios Rípodas, Ernesto Upna Orcid; Larequi, Íñigo; Ursúa Rubio, Alfredo Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      Many thriving applications where isolation is required, such as LED drivers, traction and EV fast charging, implement LLC resonant converters, particularly when voltage regulation is not required or an additional ...

    • Association of intrinsic capacity with incidence and mortality of cardiovascular disease: prospective study in UK Biobank 

      Ramírez Vélez, Robinson; Iriarte-Fernández, María; Santafé Rodrigo, Guzmán Upna Orcid; Malanda Trigueros, Armando Upna Orcid; Beard, John R.; García Hermoso, Antonio; Izquierdo Redín, Mikel (Wiley, 2023)   Artículo / Artikulua  OpenAccess
      Background: The World Health Organization proposed the concept of intrinsic capacity (IC; the composite of all the physical and mental capacities of the individual) as central for healthy ageing. However, little research ...

    • 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 ...

    • High sensitivity lossy-mode resonance refractometer using low refractive index PFA planar waveguide 

      Domínguez Rodríguez, Ismel Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Ascorbe Muruzabal, Joaquín Upna Orcid; Del Villar, Ignacio Upna Orcid (Elsevier, 2023)   Artículo / Artikulua  OpenAccess
      In this work a new strategy to improve the sensitivity of refractometers based on lossy-mode resonances has been proved. The proximity of the PFA (tetrafluoroethylene-perfluoro polymer) substrate refractive index to that ...

    • Deadbeat voltage control for a grid-forming power converter with LCL filter 

      Samanes Pascual, Javier Upna Orcid; Rosado Galparsoro, Leyre Upna Orcid; Gubía Villabona, Eugenio Upna Orcid; López Taberna, Jesús Upna Orcid; Pérez, Marcelo A. (IEEE, 2023)   Artículo / Artikulua  OpenAccess
      Grid-forming power converters are controlled as voltage sources to regulate the grid voltage and frequency. These converters can increase power system strength if they impose a voltage waveform resilient to grid transients. ...
      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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