Now showing items 1-20 of 13981

    • Dual-mode soft-transition control for single-phase grid-connected photovoltaic inverters 

      Elizondo Martínez, David; Urtasun Erburu, Andoni Upna (IEEE, 2018)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Single-phase grid-connected inverters for photovoltaic power generation have been strongly analysed for improvement. Dual-mode control for two-stage inverters makes it possible to improve the efficiency by alternating ...
    • COVID-19 pandemic and economic scenarios for Ontario 

      Casares Polo, Miguel Upna; Gomme, Paul; Khan, Hashmat (2020)   Documento de trabajo / Lan gaiak  OpenAccess
      To study the efficacy of the public policy response to the COVID-19 pandemic, we develop a model of the rich interactions between epidemiology and socioeconomic choices. Preferences feature a 'fear of death' that lead ...
    • The costs of hyperinflation: Germany 1923 

      Galofré-Vilà, Gregori (2021)   Documento de trabajo / Lan gaiak  OpenAccess
      I study the link between monetary policy and populism by looking at the hyperinflation in Germany in 1923, one of the worst spells of inflation in history, and the Nazi electoral boost in 1933. Contrary to received wisdom, ...
    • Hybrid Raman‑erbium random fiber laser with a half open cavity assisted by artificially controlled backscattering fiber refectors 

      Pérez Herrera, Rosa Ana Upna; Roldán Varona, Pablo; Sañudo-Lasagabaster Ibáñez, Silvia; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna (Springer Nature, 2021)   Artículo / Artikulua  OpenAccess
      A hybrid Raman-erbium random fber laser with a half-open cavity assisted by chirped artifcially controlled backscattering fber refectors is presented. A combination of a 2.4 km-long dispersion compensating fber with two ...
    • Metageometries for polycyclic aromatic hydrocarbons detection at THz range in food systems 

      Jáuregui-López, Irati Upna; Insausti Barrenetxea, Kizkitza Upna; Beriain Apesteguía, María José Upna; Beruete Díaz, Miguel Upna (IEEE, 2021)   Artículo / Artikulua
      Polycyclic aromatic hydrocarbons, when present in food systems, have been shown to have a detrimental effect on human health, producing carcinogenic elements. So, the implementation of processes for their detection and ...
    • Pseudomonas savastanoi pv. mandevillae pv. nov., a clonal pathogen causing an emerging, devastating disease of the ornamental plant Mandevilla spp. 

      Caballo Ponce, Eloy; Pintado, Adrián; Moreno Pérez, Alba; Murillo Martínez, Jesús Upna; Smalla, Kornelia; Ramos, Cayo (APS Publications, 2021)   Artículo / Artikulua  OpenAccess
      Commercial production of the ornamental plant dipladenia (Mandevilla spp.) is threatened by dipladenia leaf and stem spot disease, caused by the bacterium Pseudomonas savastanoi. P. savastanoi includes four pathovars of ...
    • Pseudo-three-stage Miller op-amp with enhanced small-signal and large-signal performance 

      Paul, Anindita; Ramírez Angulo, Jaime; López Martín, Antonio Upna; González Carvajal, Ramón; Rocha-Pérez, José Miguel (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      A simple technique to implement highly power efficient class AB-AB Miller op-amps is presented in this paper. It uses a composite input stage with resistive local common mode feedback that provides class AB operation to ...
    • Subsampling OFDM-based ultrasonic data communication through metallic channels for monitoring of cargo containers 

      García Oya, José Ramón; Algueta-Miguel, Jose M. Upna; García Doblado, José; Muñoz Chavero, Fernando; Hidalgo Fort, Eduardo; Baena Lecuyer, Vicente; López Martín, Antonio Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      An enhanced ultrasonic communication system based on piezoelectric transducers for monitoring of goods in cargo containers is presented. The proposed system consists of several sensors placed inside the container, whose ...
    • 360 nW gate-driven ultra-low voltage CMOS linear transconductor with 1 MHz bandwidth and wide input range 

      Rico-Aniles, Héctor Daniel; Ramírez-Angulo, Jaime; López Martín, Antonio Upna; González Carvajal, Ramón (IEEE, 2020)   Artículo / Artikulua  OpenAccess
      A low voltage linear transconductor is introduced. The circuit is a pseudo differential architecture that operates with ±0.2V supplies and uses 900nA total biasing current. It employs a floating battery technique to achieve ...
    • Energy-efficient amplifiers based on quasi-floating gate techniques 

      López Martín, Antonio Upna; Garde Luque, María Pilar Upna; Algueta-Miguel, Jose M.; Beloso-Legarra, Javier; González Carvajal, Ramón; Ramírez-Angulo, Jaime (MDPI, 2021)   Artículo / Artikulua  OpenAccess
      Energy efficiency is a key requirement in the design of amplifiers for modern wireless applica-tions. The use of quasi-floating gate (QFG) transistors is a very convenient approach to achieve such energy efficiency. We ...
    • Super-gain-boosted AB-AB fully differential Miller op-amp with 156dB open-loop gain and 174MV/V MHZ pF/uW figure of merit in 130nm CMOS technology 

      Paul, Anindita; Ramírez-Angulo, Jaime; Díaz Sánchez, Alejandro; López Martín, Antonio Upna; González Carvajal, Ramón; Li, Frank X. (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      A fully differential Miller op-amp with a composite input stage using resistive local common-mode feedback and regulated cascode transistors is presented here. High gain pseudo-differential auxiliary amplifiers are used ...
    • Láseres de fibra óptica 

      Pérez Herrera, Rosa Ana Upna; López-Amo Sáinz, Manuel Upna (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, ...
    • Sensitivity optimization of a microstructured optical fiber ammonia gas sensor by means of tuning the thickness of a metal oxide nano-coating 

      López Torres, Diego Upna; López Aldaba, Aitor Upna; Elosúa Aguado, César Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna (IEEE, 2019)   Artículo / Artikulua  OpenAccess
      In this paper, the influence of the thickness of metallic-oxide coatings, ITO, and SnO2 on the sensitivity of a microstructured optical fiber Fabry–Pérot (FP) has been studied with the aim of developing ammonia gas fiber ...
    • Methods for analysis of specific DNA methylation status 

      Pajares Villandiego, María Josefa; Palanca Ballester, Cora; Urtasun Alonso, Raquel; Alemany Cosme, Ester; Lahoz, Agustín; Sandoval, Juan (Elevier, 2021)   Artículo / Artikulua
      Methylation of CpG dinucleotides plays a crucial role in the regulation of gene expression and therefore in the development of different pathologies. Aberrant methylation has been associated to the majority of the diseases, ...
    • Liquid level sensor based on dynamic Fabry–Perot interferometers in processed capillary fiber 

      Roldán Varona, Pablo; Pérez Herrera, Rosa Ana Upna; Rodríguez Cobo, L.; Reyes González, Luis; López-Amo Sáinz, Manuel Upna (Springer Nature, 2021)   Artículo / Artikulua  OpenAccess
      In this work, a novel optical fiber sensor capable of measuring both the liquid level and its refractive index is designed, manufactured and demonstrated through simulations and experimentally. For this, a silica capillary ...
    • Single longitudinal mode lasers by using artificially controlled backscattering erbium doped fibers 

      Pérez Herrera, Rosa Ana Upna; Roldán Varona, Pablo; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      In this work, we propose and experimentally demonstrate a new distributed short linear cavity ber laser. At one of the cavity ends, fabricated by a commercial femtosecond ber laser chirped pulse ampli er, an arti cially ...
    • Spatial-frequency multiplexing of high-sensitivity liquid level sensors based on multimode interference micro-fibers 

      Galarza Galarza, Marko Upna; Pérez Herrera, Rosa Ana Upna; Leandro González, Daniel Upna; Júdez Colorado, Aitor Upna; López-Amo Sáinz, Manuel Upna (Elsevier, 2020)   Artículo / Artikulua
      This paper shows a new fiber optic sensor multiplexed system for liquid level sensing. Biconical fibertapers converging at a 40 mm-long micro-fiber are used as transducers. The tapers are designed to providethe propagation ...
    • Random DFB fiber laser for remote (200 km) sensor monitoring using hybrid WDM/TDM 

      Leandro González, Daniel Upna; Miguel Soto, Verónica de Upna; Pérez Herrera, Rosa Ana Upna; Bravo Acha, Mikel Upna; López-Amo Sáinz, Manuel Upna (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; López Bautista, María del Carmen; López-Amo Sáinz, Manuel Upna (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; López-Amo Sáinz, Manuel Upna (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 ...