Now showing items 1-20 of 133

    • 119Sn Mössbauer spectroscopy for assessing the local stress and defect state towards the tuning of Ni-Mn-Sn alloys 

      Unzueta, Iraultza; López García, Javier Upna; Sánchez-Alarcos Gómez, Vicente Upna; Recarte Callado, Vicente Upna; Pérez de Landazábal Berganzo, José Ignacio Upna (AIP Publishing, 2017)   Artículo / Artikulua  OpenAccess
      The influence of defects and local stresses on the magnetic properties and martensitic transformation in Ni50Mn35Sn15 is studied at macroscopic and atomic scale levels. We show that both the structural and magnetic properties ...
    • Adsorption of rhodamine 6G and humic acids on composite bentonite-alginate in single and binary systems 

      Gomri, Fatima; Finqueneisel, Gisele; Zimny, Thierry; Korili, Sophia A. Upna; Gil Bravo, Antonio Upna; Boutahala, Mokhtar (Springer, 2018)   Artículo / Artikulua  OpenAccess
      In this work, the preparation, characterization, and sorption of rhodamine 6G and humic acids on a composite sodium alginate-bentonite were investigated. Their structure and morphology were analyzed by several techniques, ...
    • Adsorption recovery of Ag(I) and Au(III) from an electronics industry wastewater on a clay mineral composite 

      Rakhila, Youness; Elmchaouri, Abdellah; Mestari, Allal; Korili, Sophia A. Upna; Abouri, Meriem; Gil Bravo, Antonio Upna (University of Science and Technology BeijingSpringer, 2019)   Artículo / Artikulua  OpenAccess
      The aim of this work is to investigate the ability of an adsorbent of a clay mineral composite to remove and recover gold and silver ions from wastewater. The composite was prepared by mixing phosphogypsum (PG), obtained ...
    • Analysis of singular one-dimensional linear boundary value problems using two-point Taylor expansions 

      Ferreira González, Chelo Upna; López García, José Luis Upna; Pérez Sinusía, Ester Upna (University of Szeged (Hungría), 2020)   Artículo / Artikulua  OpenAccess
      We consider the second-order linear differential equation (x2 − 1)y'' + f (x)y′ + g(x)y = h(x) in the interval (−1, 1) with initial conditions or boundary conditions (Dirichlet, Neumann or mixed Dirichlet–Neumann). The ...
    • Application of eco-design and life cycle assessment standards for environmental impact reduction of an industrial product 

      Navajas León, Alberto Upna; Uriarte Elizaga, Leire; Gandía Pascual, Luis Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      Eco-design is included within the framework of the standard for “Environmental management systems—Guidelines for incorporating Eco-design” (ISO 14006:2011). Eco-design process, as defined in standard, has six steps: (i) ...
    • Application of industrial wastes from chemically treated aluminum saline slags as adsorbents 

      Gil Bravo, Antonio Upna; Arrieta Chango, Ekhine Upna; Vicente, Miguel Ángel; Korili, Sophia A. Upna (American Chemical Society, 2018)   Artículo / Artikulua  OpenAccess
      In this study, industrial wastes, which remain after aluminum extraction from saline slags, were used as adsorbents. The aluminum saline slags were treated under reflux with 2 mol/dm3 aqueous solutions of NaOH, H2SO4, and ...
    • Assigning numerical scores to linguistic expressions 

      Campión Arrastia, María Jesús Upna; Falcó Díaz de Cerio, Edurne Upna; García Lapresta, José; Induráin Eraso, Esteban Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      In this paper, we study different methods of scoring linguistic expressions defined on a finite set, in the search for a linear order that ranks all those possible expressions. Among them, particular attention is paid to ...
    • Asymptotic greediness of the Haar system in the spaces Lp[0 , 1] , 1< p< ∞ 

      Albiac Alesanco, Fernando José Upna; Ansorena, José L.; Berná, Pablo M. (Springer, 2019)   Artículo / Artikulua  OpenAccess
      Our aim in this paper is to attain a sharp asymptotic estimate for the greedy constant Cg[H(p), Lp] of the (normalized) Haar system H(p) in Lp[0 , 1] for 1 < p < ∞. We will show that the super-democracy constant of H(p) ...
    • An axiomatic approach to finite means 

      Campión Arrastia, María Jesús Upna; Candeal, Juan Carlos; García Catalán, Olga Raquel Upna; Giarlotta, Alfio; Induráin Eraso, Esteban Upna (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
      In this paper we analyze the notion of a finite mean from an axiomatic point of view. We discuss several axiomatic alternatives, with the aim of establishing a universal definition reconciling all of them and exploring ...
    • Bayesian inference in multivariate spatio-temporal areal models using INLA: analysis of gender-based violence in small areas 

      Vicente, G.; Goicoa Mangado, Tomás Upna; Ugarte Martínez, María Dolores Upna (Springer, 2020)   Artículo / Artikulua  OpenAccess
      Multivariate models for spatial count data are currently receiving attention in disease mapping to model two or more diseases jointly. They have been thoroughly studied from a theoretical point of view, but their use in ...
    • Binary relations coming from solutions of functional equations: orderings and fuzzy subsets 

      Campión Arrastia, María Jesús Upna; Miguel Turullols, Laura de Upna; García Catalán, Olga Raquel Upna; Induráin Eraso, Esteban Upna; Abrísqueta Usaola, Francisco Javier Upna (World Scientific Publishing Company, 2017)   Artículo / Artikulua  OpenAccess
      We analyze the main properties of binary relations, defined on a nonempty set, that arise in a natural way when dealing with real-valued functions that satisfy certain classical functional equations on two variables. We ...
    • Catalytic performance of bulk and Al₂O₃-supported molybdenum oxide for the production of biodiesel from oil with high free fatty acids content 

      Navajas León, Alberto Upna; Reyero Zaragoza, Inés Upna; Jiménez Barrera, Elena; Romero Sarria, Francisca; Llorca Piqué, Jordi; Gandía Pascual, Luis Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      Non-edible vegetable oils are characterized by high contents of free fatty acids (FFAs) that prevent from using the conventional basic catalysts for the production of biodiesel. In this work, solid acid catalysts are used ...
    • Characterization of two iron bullets from the royal ammunition factory of Eugi (Spain) 

      Zalakain Iriazabal, Iñaki Upna; Berlanga Labari, Carlos Upna; Álvarez Vega, Lucas; Rivero Fuente, Pedro Upna; Valencia Monreal, Javier; Rodríguez Trías, Rafael Upna (Technical Faculty, University of Belgrade, 2018)   Artículo / Artikulua  OpenAccess
      In this work, a comparative analysis of two iron bullets found in The Royal Ammunition Factory of Eugi in Navarra (Spain) was performed. Both bullets presented a spherical shape with a relatively good state of preservation, ...
    • Checking unimodality using isotonic regression: an application to breast cancer mortality rates 

      Rueda, C.; Ugarte Martínez, María Dolores Upna; Militino, Ana F. Upna (Springer, 2016)   Artículo / Artikulua  OpenAccess
      In some diseases it is well-known that a unimodal mortality pattern exists. A clear example in developed countries is breast cancer, where mortality increased sharply until the nineties and then decreased. This clear ...
    • Chemical and mechanical stability of air annealed cathodic arc evaporated CrAlON coatings 

      Almandoz Sánchez, Eluxka Upna; Fuentes, Gonzalo G.; Fernández Palacio, José; Martínez de Bujanda Carasusán, Javier; Rodríguez Trías, Rafael Upna (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
      This study reports the synthesis and characterization of ternary Cr-Al-O and quaternary Cr-Al-O-N coatings deposited by cathodic arc physical vapour deposition, for various nitrogen and oxygen mass flow ratios during the ...
    • CIELAB color paths during meat shelf life 

      Hernández Salueña, Begoña Upna; Sáenz Gamasa, Carlos Upna; Diñeiro Rubial, José Manuel Upna; Alberdi Odriozola, Coro Upna (Elsevier, 2019)   Artículo / Artikulua  OpenAccess
      Meat color evolution from freshly cut to beyond shelf life, up to 40% of metmyoglobin, has been theoretically modeled using the Kubelka-Munk theory and a set of measured reference reflectance spectra of deoxymyoglobin, ...
    • A combination of a vibrational electromagnetic energy harvester and a giant magnetoimpedance (GMI) sensor 

      Beato López, Juan Jesús Upna; Royo, Isaac Upna; Algueta-Miguel, Jose M. Upna; Gómez Polo, Cristina (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      An energy harvesting device combined with a giant magnetoimpedance (GMI) sensor is presented to analyze low frequency vibrating systems. An electromagnetic harvester based on magnetic levitation is proposed for the electric ...
    • A combination of Rosa canina extracts and gold complex favors apoptosis of Caco-2 cells by increasing oxidative stress and mitochondrial dysfunction 

      Mármol, Inés; Jiménez Moreno, Nerea Upna; Ancín Azpilicueta, Carmen Upna; Osada, Jesús; Cerrada, Elena; Rodríguez Yoldi, María Jesús (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      Given the alarming increase in colorectal cancer (CRC) worldwide, novel therapies are urgently needed. Plant-derived extracts have gained considerable interest in the last years due to their strong anticancer effect mediated ...
    • Comparative performance of coke oven gas, hydrogen and methane in a spark ignition engine 

      Ortiz Imedio, Rafael; Ortiz, A.; Urroz Unzueta, José Carlos Upna; Diéguez Elizondo, Pedro; Gorri, D.; Gandía Pascual, Luis Upna; Ortiz, I. (Elsevier, 2020)   Artículo / Artikulua
      In this study, coke oven gas (COG), a by-product of coke manufacture with a high volumetric percentage of H2 and CH4, has been identified as auxiliary support and promising energy source in stationary internal combustion ...
    • Comparative removal of emerging contaminants from aqueous solution by adsorption on an activated carbon 

      Gil Bravo, Antonio Upna; Taoufik, Nawal; García Mora, Ana María; Korili, Sophia A. Upna (Taylor & Francis, 2019)   Artículo / Artikulua  OpenAccess
      Batch sorption experiments were performed to study the adsorption of six emerging pollutants from aqueous solutions using a commercial granular activated carbon as adsorbent. Caffeine, clofibric acid, diclofenac, gallic ...