InaMat - Institute for Advanced Materials

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  • Dynamics of axially symmetric perturbed Hamiltonians in 1:1:1 resonance 

    Carrasco, Dante; Palacián Subiela, Jesús Francisco Upna; Vidal, Claudio; Vidarte, Jhon; Yanguas Sayas, Patricia Upna (Springer, 2018)   Artículo / Artikulua
    We study the dynamics of a family of perturbed three-degree-of-freedom Hamiltonian systems which are in 1:1:1 resonance. The perturbation consists of axially symmetric cubic and quartic arbitrary polynomials. Our analysis ...

  • Singular reduction of resonant Hamiltonians 

    Meyer, Kenneth Ray; Palacián Subiela, Jesús Francisco Upna; Yanguas Sayas, Patricia Upna (IOP PublishingLondon Mathematical Society, 2018)   Artículo / Artikulua
    We investigate the dynamics of resonant Hamiltonians with n degrees of freedom to which we attach a small perturbation. Our study is based on the geometric interpretation of singular reduction theory. The flow of the ...

  • Oscillatory motions in restricted N-body problems 

    Alvarez-Ramírez, Martha; Rodríguez García, Antonio Upna; Palacián Subiela, Jesús Francisco Upna; Yanguas Sayas, Patricia Upna (Elsevier, 2018)   Artículo / Artikulua
    We consider the planar restricted N-body problem where the N−1 primaries are assumed to be in a central configuration whereas the infinitesimal particle escapes to infinity in a parabolic orbit. We prove the existence of ...

  • 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
    We analyze the main properties of binary relations, defined o n 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 ...

  • 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 ...

  • Effect of the temperature in the mechanical properties of austenite, ferrite and sigma phases of duplex stainless steels using hardness, microhardness and nanoindentation techniques 

    Argandoña Salinas, Gorka; Palacio, José; Berlanga Labari, Carlos Upna; Biezma, María V.; Rivero Fuente, Pedro José Upna; Peña, Julio; Rodríguez Trías, Rafael Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    The aim of this work is to study the hardness of the ferrite, austenite and sigma phases of a UNS S32760 superduplex stainless steel submitted to different thermal treatments, thus leading to different percentages of the ...

  • Stochastic spatio-temporal models for analysing NDVI distribution of GIMMS NDVI3g images 

    Militino, Ana F. Upna; Ugarte Martínez, María Dolores Upna; Pérez Goya, Unai Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    The normalized difference vegetation index (NDVI) is an important indicator for evaluating vegetation change, monitoring land surface fluxes or predicting crop models. Due to the great availability of images provided by ...

  • Mid-infrared spectroscopy (MIR) for simultaneous determination of fat and protein content in meat of several animal species 

    Lozano Saiz, María; Rodríguez Ulibarri, Pablo Upna; Echeverría Morrás, Jesús Upna; Beruete Díaz, Miguel Upna; Sorolla Ayza, Mario Upna; Beriain Apesteguía, María José Upna (Springer, 2017)   Artículo / Artikulua
    The aim of this research was to study the application of MIR spectroscopy as an alternative to conventional methods to determine fat and protein content. Samples of the main species used to produce meat products were ...

  • Temporal evolution of brain cancer incidence in the municipalities of Navarre and the Basque Country, Spain 

    Ugarte Martínez, María Dolores Upna; Adin Urtasun, Aritz Upna; Goicoa Mangado, Tomás Upna; Casado, Itziar; Ardanaz, Eva; Larrañaga, Nerea (BioMed Central, 2015)   Artículo / Artikulua  OpenAccess
    Background: Brain cancer incidence rates in Spain are below the European’s average. However, there are two regions in the north of the country, Navarre and the Basque Country, ranked among the European regions with ...

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