Now showing items 1-20 of 53

    • Thrust actuator with passive restoration force for wide gap magnetic bearings 

      Royo, Isaac; Beato López, Juan Jesús; Castellano Aldave J. C.; Gómez Polo, Cristina (Elsevier, 2019)   Artículo / Artikulua
      Active thrust magnetic bearings provide an axial force to balance the moving parts of machines. However, most devices produce null or unbalancing passive forces. Furthermore, reported designs usually feature very small ...
    • Corrigendum to “Oscillatory motions in restricted N-body problems” [J. Differential Equations 265 (2018) 779–803] 

      Alvarez-Ramírez, Martha; García, Antonio Upna; Palacián Subiela, Jesús Francisco Upna; Yanguas Sayas, Patricia Upna (Elsevier, 2019)   Artículo / Artikulua
      At the beginning of paper [1] there is an error that spreads along the rest of the work and the conclusions are not correct in their present form. Precisely, in Section 2, page 783, there is a contradiction related to the ...
    • On co-orbital quasi-periodic motion in the three-body problem 

      Cors, Josep Maria; Palacián Subiela, Jesús Francisco Upna; Yanguas Sayas, Patricia Upna (Society for Industrial and Applied Mathematics (SIAM), 2019)   Artículo / Artikulua  OpenAccess
      Within the framework of the planar three-body problem we establish the existence of quasi-periodic motions and KAM 4-tori related to the co-orbital motion of two small moons about a large planet where the moons move in ...
    • Effects of a soft-core coulomb potential on the dynamics of a hydrogen atom near a metal surface 

      Iñarrea, Manuel; Lanchares, Víctor; Palacián Subiela, Jesús Francisco Upna; Pascual, Ana Isabel; Salas, José Pablo; Yanguas Sayas, Patricia Upna (Elsevier, 2019)   Artículo / Artikulua
      The goal of this paper is to investigate the effects that the replacement of the Coulomb potential by a soft-core Coulomb potential produces in the classical dynamics of a perturbed Rydberg hydrogen atom. As example, we ...
    • Periodic solutions, KAM tori and bifurcations in a cosmology-inspired potential 

      Palacián Subiela, Jesús Francisco Upna; Vidal, Claudio; Vidarte, Jhon; Yanguas Sayas, Patricia Upna (IOP Publishing, 2019)   Artículo / Artikulua
      A family of perturbed Hamiltonians H = 1/2 (x^2 + X^2) − 1/2 (y^2 + Y^2)+1/2 (z^2 + Z^2) + 2[ (x^4 + y^4 + z^4) + (x^2 y^2 + x^2 z^2 + y^2 z^2)] in 1: −1:1 resonance depending on two real parameters is considered. We ...
    • Experimental Stark widths and shifts of MnII spectral lines 

      Manrique Rosel, Javier; Aragón Garbizu, Carlos Upna; Aguilera Andoaga, José Antonio Upna (Oxford University Press, 2019)   Artículo / Artikulua  OpenAccess
      Stark widths and shifts of MnII lines with wavelengths in the range 2300-3500 Å have been measured by laser-induced breakdown spectroscopy. The use of fused glass samples with varying Mn concentrations has allowed minimization ...
    • IAOx induces the SUR phenotype and differential signalling from IAA under different types of nitrogen nutrition in Medicago truncatula roots 

      Buezo Bravo, Javier; Esteban Terradillos, Raquel; Cornejo Ibergallartu, Alfonso; López Gómez, Pedro; Marino, Daniel; Chamizo Ampudia, Alejandro; Gil Idoate, María José; Martínez Merino, Víctor; Morán Juez, José Fernando Upna (Elsevier, 2019)   Artículo / Artikulua
      Indole-3-acetaldoxime (IAOx) is a particularly relevant molecule as an intermediate in the pathway for tryptophan-dependent auxin biosynthesis. The role of IAOx in growth-signalling and root phenotype is poorly studied in ...
    • Photocatalytic degradation of trimethoprim on doped Ti-pillared montmorillonite 

      González, Beatriz; Trujillano, Raquel; Vicente, Miguel A.; Rives Vicente; Korili, Sophia A.; Gil Bravo, Antonio Upna (Elsevier, 2019)   Artículo / Artikulua
      Montmorillonite pillared with titanium and doped with Cr3+ or Fe3+ has been tested for the photo-degradation of the antibiotic trimethoprim (trimethoxybenzyl-2,4-pyrimidinediamine) under different conditions, namely, in ...
    • Effective degradation of methylene blue in aqueous solution using Pd-supported Cu-doped Ti-pillared montmorillonite catalyst 

      Joseph, Annu; Vellayan, Kannan; González, Beatriz; Vicente, Miguel A.; Gil Bravo, Antonio Upna (Elsevier, 2019)   Artículo / Artikulua
      The effluents from the textile, paper and food industries contain organic dyes that are strongly colored and reveal harmful effect on living systems. In order to reduce water pollution, the degradation of dye into non toxic ...
    • Singular reduction of resonant Hamiltonians 

      Meyer, Kenneth Ray; Palacián Subiela, Jesús Francisco Upna; Yanguas Sayas, Patricia Upna (IOP PublishingLondon Mathematical Society, 2018)   Artículo / Artikulua  OpenAccess
      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 ...
    • Tailoring the structural and magnetic properties of Co-Zn nanosized ferrites for hyperthermia applications 

      Gómez Polo, Cristina; Recarte Callado, Vicente Upna; Cervera Gabalda, Laura María; Beato López, Juan Jesús; López García, Javier; Rodríguez Velamazán, José Alberto; Ugarte Martínez, María Dolores Upna; Mendonça, E. C.; Duque, J. G. S. (Elsevier, 2018)   Artículo / Artikulua
      A comparative study of the magnetic properties (magnetic moment, magnetocrystalline anisotropy) and hyperthermia response in Co-Zn spinel nanoparticles is presented. The CoxZn1-xFe2O4 nanoparticles (x = 1, 0.5, 0.4, 0.3, ...
    • Micrometric non-contact position magnetoimpedance sensor 

      Beato López, Juan Jesús; Royo, Isaac; Gómez Polo, Cristina (Elsevier, 2018)   Artículo / Artikulua
      In this work a sensitive micrometric non-contact position sensor based on the Giant MagnetoImpedance effect (GMI) is analyzed. A nearly zero magnetostrictive CoFeSiBCr wire was employed as sensor nucleus. The sensing ...
    • Hydrophobic and corrosion behavior of sol-gel hybrid coatings based on the combination of TiO2 NPs and fluorinated chains for aluminum alloys protection 

      Rivero Fuente, Pedro Upna; Maeztu Redin, Juan Deyo; Berlanga Labari, Carlos Upna; Miguel, Adrián; Palacio, José; Rodríguez Trías, Rafael Upna (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      In this work, layers of a sol-gel hybrid matrix doped with metal oxide nanoparticles (TiO2 NPs) have been deposited on flat samples of AA6061-T6 aluminum alloy using the dip-coating technique, with the aim of obtaining ...
    • Orness measurements for lattice m-dimensional interval-valued OWA operators 

      Miguel Turullols, Laura de Upna; Paternain Dallo, Daniel Upna; Lizasoain Iriso, María Inmaculada Upna; Ochoa Lezaun, Gustavo Upna; Bustince Sola, Humberto Upna (Elsevier, 2018)   Artículo / Artikulua
      Ordered weighted average (OWA) operators are commonly used to aggregate information in multiple situations, such as decision making problems or image processing tasks. The great variety of weights that can be chosen to ...
    • Normalization through invariants in n-dimensional Kepler problems 

      Meyer, Kenneth Ray; Palacián Subiela, Jesús Francisco Upna; Yanguas Sayas, Patricia Upna (Pleiades Publishing, 2018)   Artículo / Artikulua  OpenAccess
      We present a procedure for the normalization of perturbed Keplerian problems in n dimensions based on Moser regularization of the Kepler problem and the invariants associated to the reduction process. The approach allows ...
    • 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.; 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, ...
    • Especificidades ion–macromolécula observadas con diversas sales y clara de huevo cocida 

      Fernández-d'Arlas Bidegáin, Borja (Universidad del País Vasco, 2018)   Artículo / Artikulua  OpenAccess
      En este artículo se presentan los resultados de unos sencillos ensayos de solubilidad de la clara de huevo cocido en medios tanto básico como ácido en presencia de distintas sales tales como haluros sódicos y varios cloruros ...
    • Geometrical aggregation of finite fuzzy sets 

      Campión Arrastia, María Jesús Upna; García Catalán, Olga Raquel Upna; Indurain Eraso, Esteban; Lizasoain Iriso, María Inmaculada Upna; Raventós Pujol, Armajac; Valero, Óscar (Elsevier, 2018)   Artículo / Artikulua
      A fuzzy set on a finite universe can be interpreted as a vector in a unit cube. This gives rise to a huge variety of approaches in order to aggregate finite fuzzy sets or to modify a given one. We analyze several geometrical ...
    • Functionalized electrospun fibers for the design of novel hydrophobic and anticorrosive surfaces 

      Rivero Fuente, Pedro Upna; Yurrita Silanes, David; Berlanga Labari, Carlos Upna; Palacio, José; Rodríguez Trías, Rafael Upna (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      In this work, a novel coating was deposited on aluminum alloy samples by using a combination of electrospinning and chemical vapor deposition (CVD-silanization) techniques in order to create a functionalized film with an ...
    • The use of two-point Taylor expansions in singular one-dimensional boundary value problems I 

      Ferreira, Chelo; López García, José Luis; Pérez Sinusía, Ester (Elsevier, 2018)   Artículo / Artikulua
      We consider the second-order linear differential equation (x + 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 ...