Recent Submissions

  • Electronic controlled device for the analysis and design of photovoltaic systems 

    Sanchis Gúrpide, Pablo Upna Orcid; López Taberna, Jesús Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid; Marroyo Palomo, Luis Upna Orcid (IEEE, 2005)   Artículo / Artikulua  OpenAccess
    The characterization and design of photovoltaic systems is a difficult issue due to the variable operation atmospheric conditions. With this aim, simulators and measurement equipments have been proposed. However, most of ...
  • Boost DC-AC inverter: a new control strategy 

    Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid; Gubía Villabona, Eugenio Upna Orcid; Marroyo Palomo, Luis Upna Orcid (IEEE, 2005)   Artículo / Artikulua  OpenAccess
    Boost dc–ac inverter naturally generates in a single stage an ac voltage whose peak value can be lower or greater than the dc input voltage. The main drawback of this structure deals with its control. Boost inverter ...
  • Design methodology for the frequency shift method of islanding prevention and analysis of its detection capability 

    Sanchis Gúrpide, Pablo Upna Orcid; Marroyo Palomo, Luis Upna Orcid; Coloma, Javier (Wiley, 2005)   Artículo / Artikulua  OpenAccess
    Islanding protection is one of the most important sources of discrepancy in gridconnected photovoltaic systems. Even when islanding is not very likely to happen, regulations demand the photovoltaic inverters to implement ...
  • Electro-thermal modelling of a supercapacitor and experimental validation 

    Berrueta Irigoyen, Alberto Upna Orcid; San Martín Biurrun, Idoia Upna Orcid; Hernández, Andoni; Ursúa Rubio, Alfredo Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid (Elsevier, 2014)   Artículo / Artikulua  OpenAccess
    This paper reports on the electro-thermal modelling of a Maxwell supercapacitor (SC), model BMOD0083 with a rated capacitance of 83 F and rated voltage of 48 V. One electrical equivalent circuit was used to model the ...
  • Methodology for sizing stand-alone hybrid systems: a case study of a traffic control system 

    San Martín Biurrun, Idoia Upna Orcid; Berrueta Irigoyen, Alberto Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
    This paper proposes a methodology for sizing stand-alone hybrid photovoltaic-wind power generation systems. This methodology makes it possible to optimise the overall performance of the stand-alone system components, based ...
  • Hydrogen production from water electrolysis: current status and future trends 

    Ursúa Rubio, Alfredo Upna Orcid; Gandía Pascual, Luis Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid (IEEE, 2012)   Artículo / Artikulua  OpenAccess
    This paper reviews water electrolysis technologies for hydrogen production and also surveys the state of the art of water electrolysis integration with renewable energies. First, attention is paid to the thermodynamic and ...
  • Analytical design methodology for Litz-wired high-frequency power transformers 

    Barrios Rípodas, Ernesto Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid; Marroyo Palomo, Luis Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid (IEEE, 2015)   Artículo / Artikulua  OpenAccess
    In the last quarter of a century, high-frequency (HF) transformer design has been one of the major concerns to power electronics designers in order to increase converter power densities and efficiencies. Conventional design ...
  • Influence of the power supply on the energy efficiency of an alkaline water electrolyser 

    Ursúa Rubio, Alfredo Upna Orcid; Marroyo Palomo, Luis Upna Orcid; Gubía Villabona, Eugenio Upna Orcid; Gandía Pascual, Luis Upna Orcid; Diéguez Elizondo, Pedro Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid (Elsevier, 2009)   Artículo / Artikulua  OpenAccess
    Electric energy consumption represents the greatest part of the cost of the hydrogen produced by water electrolysis. An effort is being carried out to reduce this electric consumption and improve the global efficiency ...
  • On the testing, characterization, and evaluation of PV inverters and dynamic MPPT performance under real varying operating conditions 

    Sanchis Gúrpide, Pablo Upna Orcid; López Taberna, Jesús Upna Orcid; Ursúa Rubio, Alfredo Upna Orcid; Gubía Villabona, Eugenio Upna Orcid; Marroyo Palomo, Luis Upna Orcid (Wiley, 2007)   Artículo / Artikulua  OpenAccess
    The increasing number of photovoltaic inverters that are coming on to the PV marketstresses the need to carry out a dynamic characterization of these elements and theirmaximum power point tracking (MPPT) algorithms under ...
  • Ultrahigh sensitive detection of tau protein as Alzheimer's biomarker via microfluidics and nanofunctionalized optical fiber sensors 

    Chiavaioli, Francesco; Santano, Desiree Upna Orcid; Del Villar, Ignacio Upna Orcid; Socorro Leránoz, Abián Bentor Upna Orcid; Zhang, Xuejun; Li, Kaiwei; Santamaría Martínez, Enrique; Fernández Irigoyen, Joaquín Upna Orcid; Baldini, Francesco; Van den Hove, Daniel L. A.; Shi, Lei; Bi, Wei; Guo, Tuan; Giannetti, Ambra; Matías Maestro, Ignacio Upna Orcid (Wiley, 2022)   Artículo / Artikulua  OpenAccess
    Alzheimer’s disease (AD) is one of the most common neurodegenerative illnesses displaying the highest death rate in the elderly. However, the existing AD diagnostic system remains elusive due to lack of a technology that ...
  • Optomagnonics in dispersive media: magnon-photon coupling enhancement at the epsilon-near-zero frequency 

    Bittencourt, V.A.S.V.; Liberal Olleta, Íñigo Upna Orcid; Viola Kusminskiy, Silvia (American Physical Society, 2022)   Artículo / Artikulua  OpenAccess
    Reaching strong light-matter coupling in solid-state systems has long been pursued for the implementation of scalable quantum devices. Here, we put forward a system based on a magnetized epsilon-near-zero (ENZ) medium, and ...
  • Láseres de fibra óptica 

    Pérez Herrera, Rosa Ana Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (Versys, 2011)   Artículo / Artikulua  OpenAccess
    Desde su desarrollo en los años 60 hasta nuestros días, los láseres de fibra óptica han ido incrementando su importancia en diversos ámbitos de nuestra vida. Ya sea en la medicina, la electrónica de consumo o la industria, ...
  • Random DFB fiber laser for remote (200 km) sensor monitoring using hybrid WDM/TDM 

    Leandro González, Daniel Upna Orcid; Miguel Soto, Verónica de Upna Orcid; Pérez Herrera, Rosa Ana Upna Orcid; Bravo Acha, Mikel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2016)   Artículo / Artikulua  OpenAccess
    In this paper, a random distributed feedback fiber laser is proposed as a multiplexing scheme for ultralong range measurements (up to 200 km). Optical fiber sensors are time and wavelength multiplexed overcoming one of the ...
  • Simultaneous measurement of humidity and vibration based on a microwire sensor system using Fast Fourier Transform technique 

    Rota Rodrigo, Sergio Upna; López Aldaba, Aitor Upna; Pérez Herrera, Rosa Ana Upna Orcid; López Bautista, María del Carmen; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2016)   Artículo / Artikulua  OpenAccess
    This paper presents a new sensor system for vibration and relative humidity measurements based on its interaction with the evanescent field of a microwire. The interrogation of the sensing head is carried out by monitoring ...
  • Fiber optic sensor networks 

    Pérez Herrera, Rosa Ana Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (Elsevier, 2013)   Artículo / Artikulua  OpenAccess
    One of the main goals in fiber optic sensor technology is to multiplex together a high number of sensorsin the same network in order to share expensive terminal equipment and develop a system including multiple measuring ...
  • Low noise dual-wavelength erbium fiber laser in single-longitudinal-mode operation 

    Rota Rodrigo, Sergio Upna; Pérez Herrera, Rosa Ana Upna Orcid; Fernández Vallejo, Montserrat Upna; López-Amo Sáinz, Manuel Upna Orcid (Springer, 2012)   Artículo / Artikulua  OpenAccess
    A new stable dual-wavelength fiber-ring laser based on erbium-doped fiber amplification is reported. The laser is based on ring resonators and employs fiber Bragg gratings to select the operation wavelengths. The ...
  • Stabilization of dual-wavelength erbium doped ring fiber lasers by single-mode operation 

    Quintela, M. A.; Pérez Herrera, Rosa Ana Upna Orcid; Canales, Irene; Fernández Vallejo, Montserrat Upna; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2010)   Artículo / Artikulua  OpenAccess
    In this work, a novel single-longitudinal-mode (SLM) dual-wavelength laser configuration is proposed and demonstrated. This laser is based on ring resonators, and employs fiber Bragg gratings to select the operation ...
  • Experimental optimization in terms of power stability and output power of highly Er-doped fiber lasers with single and hybrid cavities 

    Pérez Herrera, Rosa Ana Upna Orcid; Chen, Shuying; Zhao, Weizhong; Sun, Tong; López-Amo Sáinz, Manuel Upna Orcid (Taylor & Francis, 2010)   Artículo / Artikulua  OpenAccess
    In this article, the output power stability of several different highly erbiumdoped fiber ring lasers, as a function of the laser parameters, is experimentally investigated. The study is focused on the optimization of ...
  • Advances in residential design related to the influence of geomagnetism 

    Glaria, Francisco; Arnedo Gil, Israel Upna Orcid; Sánchez Ostiz, Ana (MDPI, 2018)   Artículo / Artikulua  OpenAccess
    Since the origin of the Modern Movement, there has been a basic commitment to improving housing conditions and the well-being of occupants, especially given the prediction that 2/3 of humanity will reside in cities by 2050. ...
  • End-of-fiber signals strongly influence the first and second phases of the M wave in the vastus lateralis: implications for the study of muscle excitability 

    Rodríguez Falces, Javier Upna Orcid; Place, Nicolas (Frontiers Media, 2018)   Artículo / Artikulua  OpenAccess
    It has been recurrently observed that, for compound muscle action potentials (M wave) recorded over the innervation zone of the vastus lateralis, the descending portion of the first phase generally shows an 'inflection' ...

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