Now showing items 1-20 of 133

    • 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, ...
    • Study of the martensitic transition in Ni-Mn-Sn-Ti ferromagnetic shape memory alloys 

      Bonifacich, Federico Guillermo; Lambri, Osvaldo Agustín; Pérez de Landazábal Berganzo, José Ignacio Upna; Recarte Callado, Vicente Upna; Sánchez-Alarcos Gómez, Vicente Upna (Rede Latino-Americana de Materiais, 2018)   Artículo / Artikulua  OpenAccess
      In the present work, mechanical spectroscopy measurements as a function of temperature and strain have been performed in (at.%) Ni50Mn37Sn13-xTix (x=0, 0.5 and 2) ferromagnetic shape memory alloys in order both to study ...
    • Evolution of magnetic response as a function of annealing temperature in Fe-based alloys 

      Gargicevich, Damián; Bonifacich, Federico Guillermo; Lambri, Osvaldo Agustín; Pérez de Landazábal Berganzo, José Ignacio Upna; Recarte Callado, Vicente Upna (Rede Latino-Americana de Materiais, 2018)   Artículo / Artikulua  OpenAccess
      The magnetic response, coercive force and magnetic induction, in Fe-10at.% Si, Fe-6at.% Al-9at.% Si and Fe-4at.% Al-8at.% Ge alloys as a function of the annealing temperature was determined and correlated to the microstructural ...
    • Two-level resolution of relative risk of dengue disease in a hyperendemic city of Colombia 

      Adin Urtasun, Aritz Upna; Martínez Bello, Daniel Adyro; López Quílez, Antonio; Ugarte Martínez, María Dolores Upna (Public Library of Science, 2018)   Artículo / Artikulua  OpenAccess
      Risk maps of dengue disease offer to the public health officers a tool to model disease risk in space and time. We analyzed the geographical distribution of relative incidence risk of dengue disease in a high incidence ...
    • Influence of defects on the irreversible phase transition in the Fe-Pd doped with Co and Mn 

      Bonifacich, Federico Guillermo; Lambri, Osvaldo Agustín; Pérez de Landazábal Berganzo, José Ignacio Upna; Recarte Callado, Vicente Upna; Sánchez-Alarcos Gómez, Vicente Upna (Rede Latino-Americana de Materiais, 2018)   Artículo / Artikulua  OpenAccess
      The appearance of BCT martensite in Fe-Pd-based ferromagnetic shape memory alloys, which develops at lower temperatures than the thermoelastic martensitic transition, deteriorates the shape memory properties. In a previous ...
    • 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 ...
    • Highly sensitive SERS quantification of organophosphorous chemical warfare agents: a major step towards the real time sensing in the gas phase 

      Lafuente, Marta; Pellejero, Ismael Upna; Sebastián, Víctor; Urbiztondo, Miguel A.; Mallada, Reyes (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
      A surface-enhanced Raman scattering (SERS)-based sensor was developed for the label-free real-time gas phase detection of dimethyl methylphosphonate (DMMP); a surrogate molecule of the G-series nerve agents which are of ...
    • CrAlON CAE-PVD coatings for oxidation and wear protection of TZM alloys in FAST sintering applications 

      Almandoz Sánchez, Eluxka Upna; Fernández de Ara, Jonathan; Martínez de Bujanda Carasusán, Javier; Fernández Palacio, José; Rodríguez Trías, Rafael Upna (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
      In this work CrAlO and CrAlO/CrAlN multilayers deposited by cathodic arc evaporation are evaluated as protective films in metal and ceramic powder FAST sintering tool dies fabricated in titanium-zirconium-molybdenum allows ...
    • 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 ...
    • Zirconia-supported tungstophosphoric heteropolyacid as heterogeneous acid catalyst for biodiesel production 

      Alcañiz Monge, Juan; El Bakkali, Bouchra; Trautwein, Guido; Reinoso, Santiago Upna (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
      A series of materials based on the immobilization of the 12-tungstophosphoric heteropolyacid over zirconia supports have been prepared and applied as heterogeneous acid catalysts in the esterification of palmitic acid with ...
    • Direct analysis of aluminum alloys by CSigma laser-induced breakdown spectroscopy 

      Aragón Garbizu, Carlos Upna; Aguilera Andoaga, José Antonio Upna (Elsevier, 2018)   Artículo / Artikulua  OpenAccess
      We report the application of CSigma laser-induced breakdown spectroscopy (Cσ-LIBS) to quantitative analysis of aluminum alloys without sample preparation. Cσ-LIBS simplifies strongly the conventional calibration procedure ...
    • 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 ...
    • Kinetic analysis and CFD simulations of the photocatalytic production of hydrogen in silicone microreactors from water-ethanol mixtures 

      Castedo, Alejandra; Uriz Doray, Irantzu Upna; Soler, Lluís; Gandía Pascual, Luis; Llorca Piqué, Jordi (Elsevier, 2017)   Artículo / Artikulua  OpenAccess
      Silicone microreactors containing microchannels of 500 μm width in a single or triple stack configuration have been manufactured, coated with an Au/TiO2 photocatalyst and tested for the photocatalytic production of hydrogen ...
    • A simple approach to develop tailored mesoporosity in nanostructured heteropolysalts 

      Alcañiz Monge, Juan; Trautwein, Guido; El Bakkali, Bouchra; Reinoso, Santiago Upna (Wiley, 2017)   Artículo / Artikulua  OpenAccess
      In this study, we describe a very simple approach to the development of tailored mesoporosity in any nanostructured heteropolysalt with control over both the mesoporous volume and the pore size. This approach, which consists ...
    • Wettability control on microstructured polypropylene surfaces by means of O2 plasma 

      Lafuente, Marta; Martínez, Elena; Pellejero, Ismael Upna; Artal, María del Carmen; Pina, María del Pilar (Wiley, 2017)   Artículo / Artikulua  OpenAccess
      Durable and wear resistant polypropylene surfaces with static contact angle (SCA) above 140° have been fabricated using standard photolithographic process and O2 plasma etching followed by thermal annealing at 100 °C. This ...
    • Thermal degradation of type I collagen from bones 

      Lambri, M. L.; Giordano, E. D.; Bozzano, P. B.; Pérez de Landazábal Berganzo, José Ignacio Upna; Recarte Callado, Vicente Upna (Tech Science Press, 2016)   Artículo / Artikulua  OpenAccess
      The denaturation processes of collagen in the temperature range between 450 K and 670 K are revealed through studies performed on cow rib bones by means of mechanical spectroscopy, differential scanning calorimetry, ...
    • 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 ...
    • Real elements and p-nilpotence of finite groups 

      Ballester Bolinches, Adolfo; Esteban Romero, Ramón; Ezquerro Marín, Luis Miguel Upna (Aracne, 2016)   Artículo / Artikulua  OpenAccess
      Our first main result proves that every element of order 4 of a Sylow 2-subgroup S of a minimal non-2-nilpotent group G, is a real element of S. This allows to give a character-free proof of a theorem due to Isaacs and ...
    • Uniformly convergent expansions for the generalized hypergeometric functions p –1Fp and pFp 

      López García, José Luis Upna; Pagola Martínez, Pedro Jesús Upna; Karp, D. B. (Taylor & Francis, 2020)   Artículo / Artikulua
      We derive a convergent expansion of the generalized hypergeometric function p−1 F p in terms of the Bessel functions 0 F 1 that holds uniformly with respect to the argument in any horizontal strip of the complex plane. We ...
    • On the performances of trend and change-point detection methods for remote sensing data 

      Militino, Ana F. Upna; Moradi, Mohammad Mehdi; Ugarte Martínez, María Dolores Upna (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      Detecting change-points and trends are common tasks in the analysis of remote sensing data. Over the years, many different methods have been proposed for those purposes, including (modified) Mann-Kendall and Cox-Stuart ...