Now showing items 1809-1828 of 1898

    • Ultra-compact planoconcave zoned metallic lens based on the fishnet metamaterial 

      Pacheco Peña, Víctor Upna; Orazbayev, Bakhtiyar Upna; Torres Landívar, Víctor Upna; Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna (AIP Publishing, 2013)   Artículo / Artikulua  OpenAccess
      A 1.5λ0 -thick planoconcave zoned lens based on the fishnet metamaterial is demonstrated experimentally at millimeter wavelengths. The zoning technique applied allows a volume reduction of 60% compared to a full fishnet ...
    • Ultra-long (290 km) remote interrogation sensor network based on a random distributed feedback fiber laser 

      Miguel Soto, Verónica de; Leandro González, Daniel Upna; López-Amo Sáinz, Manuel Upna (Optical Society of America, 2018)   Artículo / Artikulua  OpenAccess
      In this work, an interferometric sensor has been interrogated 290 km away from the monitoring station, reaching the longest distance in fiber optic sensing up to date. This has been attained by employing a double-pumped ...
    • Ultra-wide band corrugated profiled horn antenna design 

      Teniente Vallinas, Jorge Upna; Gonzalo García, Ramón Upna; Río Bocio, Carlos del Upna (IEEE, 2002)   Artículo / Artikulua  OpenAccess
      Nowadays, an increasing number of applications need stable radiation patterns with low sidelobes and low crosspolar levels in a very wide bandwidth. Gaussian Profiled Horn Antennas (GPHA’s) have demonstrated its feasibility ...
    • Ultra-wideband metamaterial filter based on electroinductive-wave coupling between microstrips 

      Navarro Cía, Miguel Upna; Carrasco, J.M.; Beruete Díaz, Miguel Upna; Falcone Lanas, Francisco Javier Upna (EMW Publishing, 2009)   Artículo / Artikulua  OpenAccess
      In this work, we analyse the frequency response of microstrip lines coupled by complementary split ring resonators (CSRRs) etched on the ground plane supporting electroinductive waves (EIWs). The single-particle ...
    • Ultrahigh-sensitivity sensors based on thin-film coated long period gratings with reduced diameter, in transition mode and near the dispersion turning point 

      Del Villar, Ignacio Upna (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
      The mode transition and the dispersion turning point have been explored for optimization of thin-film coated long period fiber gratings during the last years. In this work and additional parameter, the cladding diameter, ...
    • Ultzamako hizkeraren polimorfismo aizenaren inflexioan 

      Ibarra Murillo, Orreaga Upna (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 1995)   Artículo / Artikulua  OpenAccess
      El objetivo de este artículo es mostrar y analizar la variación sincrónica que surge en la inflexión nominal en una variedad del euskara, -la variedad alto-navarra de Lizaso-. Demostraremos que la variación fonética no se ...
    • Umbrales de representación y proporcionalidad 

      Urdánoz Ganuza, Jorge Upna (Centro de Investigaciones SociológicasREIS, 2008)   Artículo / Artikulua  OpenAccess
      ¿Cómo medir la proporcionalidad de los sistemas de representación proporcional (RP)? Esta cuestión se ha confundido con la de los denominados «umbrales de representación». En el artículo se repasa la historia del descubrimiento ...
    • Unbalanced interval-valued OWA operators 

      Miguel Turullols, Laura de Upna; Bustince Sola, Humberto Upna; Barrenechea Tartas, Edurne Upna; Pagola Barrio, Miguel Upna; Fernández Fernández, Francisco Javier Upna (Springer Berlin Heidelberg, 2016)   Artículo / Artikulua  OpenAccess
      In this work, we introduce a new class of functions defned on the interval-valued setting. These functions extend classical OWA operators but allow for diferent weighting vectors to handle the lower bounds and the ...
    • Uncertainties caused by source directivity in room-acoustic investigations 

      San Martín Murugarren, Ricardo Upna; Arana Burgui, Miguel Upna (Acoustical Society of America (ASA), 2008)   Artículo / Artikulua  OpenAccess
      Although deviations in the measurement of acoustic parameters should be lower than the subjectively perceivable change in the corresponding parameter measured, this study reflects that directionality of sound sources could ...
    • Uncertainty with ordinal likelihood information 

      Alcalde Unzu, Jorge Upna; Arlegi Pérez, Ricardo Upna; Ballester Oyarzun, Miguel Ángel Upna (Springer-Verlag, 2013)   Artículo / Artikulua  OpenAccess
      We present a model that is closely related to the so-called models of choice under complete uncertainty, in which the agent has no information about the probability of the outcomes. There are two approaches within the said ...
    • Understanding top management's decision-making on implementing project management systems: an exploratory study 

      Arraiza Irujo, Juan; Pérez Ezcurdia, Amaya Upna (Mechanical Engineering Faculty in Slavonski Brod, 2017)   Artículo / Artikulua  OpenAccess
      Top Management’s motivation to invest in improving their organisation’s Project Management processes and practices is arguably an important under-researched phenomenon. In this paper we present the results of an exploratory ...
    • Uniform convergent expansions of the Gauss hypergeometric function in terms of elementary functions 

      Ferreira, Chelo; López García, José Luis; Pérez Sinusía, Ester (Taylor & Francis, 2018)   Artículo / Artikulua
      We consider the hypergeometric function 2F1(a, b; c; z) for z ∈ C \ [1,∞). For Ra ≥ 0, we derive a convergent expansion of 2F1(a, b; c; z) in terms of the function (1 − z)−a and of rational functions of z that is uniformly ...
    • Uniform representation of the incomplete beta function in terms of elementary functions 

      Ferreira, Chelo; López García, José Luis; Pérez Sinusía, Ester (Kent State UniversityJohann Radon Institute (RICAM), 2018)   Artículo / Artikulua  OpenAccess
      We consider the incomplete beta function Bz(a, b) in the maximum domain of analyticity of its three variables: a, b, z ∈ C, −a /∈ N, z /∈ [1, ∞). For <b ≤ 1 we derive a convergent expansion of z−aBz(a, b) in terms of the ...
    • La universidad española en un mundo globalizado: los recursos 

      Sarabia Heydrich, Bernabé Upna; Miguel, Jesús M. de (Centro de Investigaciones SociológicasREIS, 2003)   Artículo / Artikulua  OpenAccess
      Este artículo constituye una primera investigación —en el siglo XXI— sobre la Universidad en España en comparación con los sistemas de educación postsecundaria de los países del mundo. Analiza los recursos universitarios y ...
    • Upper bounds on scattering processes and metamaterial-inspired structures that reach them 

      Ederra Urzainqui, Íñigo Upna; Liberal Olleta, Íñigo Upna; Gonzalo García, Ramón Upna; Ziolkowski, Richard W. (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      The physical limitations on time-harmonic scattering processes are investigated on the basis of the optical theorem. Previously derived least upper bounds on the total scattering and absorption cross-sections are obtained ...
    • Urgencias hospitalarias y extrahospitalarias en Navarra. Razones que las motivan 

      Pérez Ciordia, Ignacio Upna; Guillén Grima, Francisco Upna (Gobierno de Navarra, 2009)   Artículo / Artikulua  OpenAccess
      Fundamento. La demanda de asistencia sanitaria urgente está alcanzando cifras cercanas a la saturación del sistema. El objetivo del trabajo es describir el perfil del demandante de urgencias hospitalarias y extrahospitalarias ...
    • Use of Bacillus thuringiensis toxins for control of the cotton pest earias insulana (Boisd.) (Lepidoptera: Noctuidae) 

      Ibarguchi Mendía, M.ª Ángeles; Estela, Anna; Ferré, Juan; Caballero Murillo, Primitivo Upna (American Society for Microbiology, 2006)   Artículo / Artikulua  OpenAccess
      Thirteen of the most common lepidopteran-specific Cry proteins of Bacillus thuringiensis have been tested for their efficacy against newly hatched larvae of two populations of the spiny bollworm, Earias insulana. At a ...
    • Use of health services according to income before and after elimination of copayment in Germany and restriction of universal health coverage in Spain 

      Lostao Unzu, Lourdes Upna; Geyer, Siegfried; Albaladejo, Romana; Moreno Lostao, Almudena; Ronda, Elena; Regidor Poyatos, Enrique (BioMed Central, 2018)   Artículo / Artikulua  OpenAccess
      Background: In Germany copayment for medical consultation was eliminated in 2013, and in Spain universal health coverage was partly restricted in 2012. This study shows the relationship between income and the use of health ...
    • Use of meta-analysis to combine candidate gene association studies: application to study the relationship between the ESR PvuII polymorphism and sow litter size 

      Alfonso Ruiz, Leopoldo Upna (EDP Sciences, 2005)   Artículo / Artikulua  OpenAccess
      This article investigates the application of meta-analysis on livestock candidate gene effects. The PvuII polymorphism of the ESR gene is used as an example. The association among ESR PvuII alleles with the number of piglets ...
    • The use of two relations in L-fuzzy contexts 

      Alcalde, Cristina; Burusco Juandeaburre, Ana Upna; Fuentes González, Ramón Upna (Elsevier, 2015)   Artículo / Artikulua  OpenAccess
      In the analysis of relations among the elements of two sets it is usual to obtain different values depending on the point of view from which these relations are measured. The main goal of the paper is the modelization of ...