Now showing items 1-20 of 4668

    • Hybrid Raman‑erbium random fiber laser with a half open cavity assisted by artificially controlled backscattering fiber refectors 

      Pérez Herrera, Rosa Ana Upna Orcid; Roldán Varona, Pablo; Sañudo-Lasagabaster Ibáñez, Silvia; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna Orcid (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 ...
    • Energy-efficient amplifiers based on quasi-floating gate techniques 

      López Martín, Antonio Upna; Garde Luque, María Pilar Upna; Algueta-Miguel, Jose M. Upna; 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 ...
    • Silicon integrated subharmonic mixer on a photonic-crystal platform 

      Torres García, Alicia E. Upna Orcid; Pérez Escudero, José Manuel Upna Orcid; Teniente Vallinas, Jorge Upna Orcid; Gonzalo García, Ramón Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid (IEEE, 2021)   Artículo / Artikulua
      This paper presents a planar silicon integrated subharmonic mixer on top of a photonic-crystal platform. The local oscillator (LO) power is injected through a 2D photoniccrystal (PC) slab to a resonant cavity that effectively ...
    • 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 ...
    • Role for physical fitness in the association between age and cognitive function in older adults: a mediation analysis of the SABE colombia study 

      Pérez Sousa, Miguel A.; Pozo Cruz, Jesús del; Olivares, Pedro R.; Cano Gutiérrez, Carlos Alberto; Izquierdo Redín, Mikel; Ramírez Vélez, Robinson (MDPI, 2021)   Artículo / Artikulua  OpenAccess
      Objectives. We investigated the association between physical fitness and cognitive status. Further, we examined whether physical fitness mediates the association between cognitive functioning and aging. Design. Cross-sectional ...
    • Challenges of viticulture adaptation to global change: tackling the issue from the roots 

      Marín Ederra, Diana Upna Orcid; Armengol, J.; Carbonell-Bejerano, P.; Escalona, J. M.; Gramaje, D.; Hernández-Montes, E.; Intrigliolo, D. S.; Martinez-Zapater, J. M.; Medrano, H.; Mirás-Avalos, J. M.; Palomares-Rius, J. E.; Romero-Azorín, P.; Savé, R.; Santesteban García, Gonzaga Upna Orcid; Herralde, Felicidad de (Wiley, 2021)   Artículo / Artikulua  OpenAccess
      Viticulture is facing emerging challenges not only because of the effect of climate change on yield and composition of grapes, but also of a social demand for environmental-friendly agricultural management. Adaptation to ...
    • A narrative review of motor competence in children and adolescents: what we know and what we need to find out 

      Lopes, Luís; Santos, Rute; Coelho e Silva, Manuel; Draper, Catherine; Mota, Jorge; Jidovtseff, Boris; Ramírez Vélez, Robinson; Clark, Cain; Schmidt, Mirko; Morgan, Philip; Duncan, Michael; O’Brien, Wesley; Bentsen, Peter; D´Hondt, Eva; Houwen, Suzanne; Stratton, Gareth; Martelaer, Kristine De; Scheuer, Claude; Herrmann, Christian; García Hermoso, Antonio; Palmeira, António; Gerlach, Erin; Rosário, Rafaela; Issartel, Johann; Esteban Cornejo, Irene; Ruiz, Jonatan R.; Veldman, Sanne; Zhang, Zhiguang; Colella, Dario; Póvoas, Susana; Haibach-Beach, Pamela; Pereira, João; McGrane, Bronagh; Saraiva, João; Temple, Viviene; Silva, Pedro; Sigmund, Erik; Sousa-Sá, Eduarda; Adamakis, Manolis; Moreira, Carla; Utesch, Till; True, Larissa; Cheung, Peggy; Carcamo Oyarzun, Jaime; Charitou, Sophia; Chillón, Palma; Robazza, Claudio; Silva, Ana; Silva, Danilo; Lima, Rodrigo; Mourão-Carvalhal, Isabel; Khodaverdi, Zeinab; Zequinão, Marcela; Pereira, Beatriz; Prista, Antonio; Agostinis-Sobrinho, César (MDPI, 2021)   Artículo / Artikulua  OpenAccess
      Lack of physical activity is a global public health problem causing not only morbidity and premature mortality, but it is also a major economic burden worldwide. One of the cornerstones of a physically active lifestyle is ...
    • Comparative study of tribomechanical properties of HiPIMS with positive pulses DLC coatings on different tools steels 

      Claver Alba, Adrián; Jiménez-Piqué, Emilio; Palacio, José; Almandoz Sánchez, Eluxka Upna Orcid; Fernández de Ara, Jonathan; Fernández, Iván; Santiago, José A.; Barba Areso, Eneko; García Lorente, José Antonio Upna Orcid (MDPI, 2021)   Artículo / Artikulua  OpenAccess
      Diamond-like carbon (DLC) coatings are very interesting due to their extraordinary properties; their excellent wear resistance, very low friction coefficient, great hardness, high elastic modulus or biocompatibility can ...
    • Propagation models in vehicular communications 

      Rodríguez Corbo, Fidel Alejandro; Azpilicueta Fernández de las Heras, Leyre; Celaya Echarri, Mikel; Vázquez Alejos, Ana; Falcone Lanas, Francisco Javier (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      In the advent of becoming reality, the era of autonomous vehicles is closer than ever, and with it, the need for faster and reliable wireless connections. The propagation channel determines the performance limits of wireless ...
    • Mediación digital y memoria histórica: una mirada desde Navarra 

      Baraibar Echeverría, Álvaro Upna Orcid (Universidad del País Vasco / Euskal Herriko Unibertsitatea, 2021)   Artículo / Artikulua  OpenAccess
      El presente artículo pretende acercarse al papel que la mediación digital y las Humanidades Digitales tienen en la gestión del patrimonio de la memoria histórica en sus diferentes expresiones. La mirada parte de Navarra, ...
    • Completers and dropouts in a prevention programme for parents of adolescents with high-risk behaviours 

      López-Goñi, José Javier Upna Orcid; Arteaga Olleta, Alfonso Upna; Ituráin Jiménez de Bentrosa, Sonia Upna; Fernández-Montalvo, Javier Upna (Colegio Oficial de Psicólogos del Principado de AsturiasUniversidad de Oviedo, 2021)   Artículo / Artikulua  OpenAccess
      Altas y Abandonos en un Programa de Prevención para Padres de Adolescentes con Conductas de Riesgo. Antecedentes: los principales objetivos fueron determinar la tasa de retención/abandono en un programa de prevención ...
    • The other halves of fascist Italy: income inequality from dynamic social tables, 1900-1950 

      Gómez León, María; Gabbuti, Giacomo (2021)   Documento de trabajo / Lan gaiak  OpenAccess
      This paper documents new, yearly estimates of overall income inequality for Italy, from the first industrial 'take-off' to the eve of the ‘Economic Miracle’, contributing both to the comparative literature on the evolution ...
    • Provincial health inequalities in Spain since 1860 

      Galofré-Vilà, Gregori; Gómez León, María (2021)   Documento de trabajo / Lan gaiak  OpenAccess
      Using annual mortality rates at the provincial level for men and women, we construct a Gini index to estimate changes in regional health inequalities since 1860 in Spain. We find a long steady decline in health inequality ...
    • A lesson from history? The 1918 influenza pandemic and the rise of Italian fascism: a cross-city quantitative and historical text qualitative analysis 

      Galofré-Vilà, Gregori; Gómez León, María; Stuckler, David (2021)   Documento de trabajo / Lan gaiak  OpenAccess
      Objectives: Evidence linking past experiences of worsening health and support for radical political views has generated concerns about the consequences of the COVID-19 pandemic. The influenza pandemic that began in 1918 ...
    • Soil water retention and soil compaction assessment in a regional-scale strategy to improve climate change adaptation of agriculture in Navarre, Spain 

      Antón Sobejano, Rodrigo Upna; Ruiz Sagaseta de Ilurdoz, Alberto; Orcaray Echeverría, Luis Upna; Arricibita Videgain, Javier; Enrique Martín, Alberto Upna Orcid; Soto García, Isabel Sonsoles de Upna Orcid; Virto Quecedo, Íñigo Upna Orcid (MDPI, 2021)   Artículo / Artikulua  OpenAccess
      The aim of this study was to evaluate the effectiveness of the different agricultural management adaptive strategies considered in the framework of a regional climate change adaptation roadmap in Navarre (Spain), from ...
    • Decoupling of traditional burnings and grazing regimes alters plant diversity and dominant species competition in high-mountain grasslands 

      Múgica Azpilicueta, Leire Upna; Canals Tresserras, Rosa María Upna Orcid; San Emeterio Garciandía, Leticia Upna Orcid; Peralta de Andrés, Francisco Javier Upna Orcid (Elsevier, 2021)   Artículo / Artikulua  OpenAccess
      Over millennia, the combination of controlled burnings and extensive grazing has maintained mosaic landscapes and preserved mountain grasslands in southern Europe. In the last century, deep socio-economic changes have led ...
    • Multitarea en una encuesta online: prevalencia, predictores e impacto en la calidad de los datos 

      León, Carmen María; Aizpurua, Eva; Díaz de Rada Igúzquiza, Vidal (Centro de Investigaciones Sociológicas, 2021)   Artículo / Artikulua  OpenAccess
      Estudios recientes muestran la elevada prevalencia de encuestados que realizan actividades secundarias mientras responden cuestionarios. Debido a la escasez de estudios y al posible impacto de la multitarea en la calidad ...
    • Effectiveness of a telephone prevention programme on the recurrence of suicidal behaviour. One-year follow-up 

      López-Goñi, José Javier Upna Orcid; Goñi-Sarriés, Adriana (Elsevier, 2021)   Artículo / Artikulua  OpenAccess
      People who have attempted suicide are considered a risk population for repeating the behaviour. Therapeutic interventions, such as telephone follow-up programmes (TFPs), are promising but more evidence for its efficacy is ...
    • Single longitudinal mode lasers by using artificially controlled backscattering erbium doped fibers 

      Pérez Herrera, Rosa Ana Upna Orcid; Roldán Varona, Pablo; Rodríguez Cobo, L.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2021)   Artículo / Artikulua  OpenAccess
      In this work, we propose and experimentally demonstrate a new distributed short linear cavity fiber laser. At one of the cavity ends, fabricated by a commercial femtosecond fiber laser chirped pulse amplfier, an artificially ...
    • Liquid level sensor based on dynamic Fabry–Perot interferometers in processed capillary fiber 

      Roldán Varona, Pablo; Pérez Herrera, Rosa Ana Upna Orcid; Rodríguez Cobo, L.; Reyes González, Luis; López-Amo Sáinz, Manuel Upna Orcid (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 ...