Now showing items 1-9 of 9

    • Bioavailability of heavy metals in soils amended with sewage sludge 

      Morera Luzán, María Teresa Upna; Echeverría Morrás, Jesús Upna; Garrido Segovia, Julián José Upna (Agricultural Institute of Canada, 2002)   Artículo / Artikulua  OpenAccess
      The recycling of sewage sludge to agricultural land results in the slow accumulation of potentially toxic heavy metals in soils. A greenhouse experiment was conducted to determine the bioavailability of Cu, Ni, Pb and ...
    • Effect of Cu substitution on the magnetic and magnetic induction heating response of CdFe₂O₄ spinel ferrite 

      Ghasemi, R.; Echeverría Morrás, Jesús Upna; Pérez de Landazábal Berganzo, José Ignacio Upna; Beato López, Juan Jesús Upna; Naseri, M.; Gómez Polo, Cristina (Elsevier, 2020)   Artículo / Artikulua
      In this work, a comparative study of the effect of Cu on the structural, magnetic and magnetic induction heating response in CdFe2O4 spinel is presented. The ceramic nanoparticles (Cu1−xCdxFe2O4; 0 ≤ x ≤ 1) were synthesized ...
    • Estrategias del alumnado de Educación Secundaria para estimar la densidad 

      Napal Fraile, María Upna; Echeverría Morrás, Jesús Upna; Zulet González, Amaia Upna; Santos Cervera, Leyre; Ibarra Murillo, Julia Upna (Universitat Autònoma de BarcelonaUniversitat de València, 2018)   Artículo / Artikulua  OpenAccess
      La densidad, o concentración de materia, es un concepto muy relevante pero que genera muchas dificultades de comprensión. Para medir la competencia en la estimación de la densidad del alumnado de la ESO, se pasó un ...
    • Fiber optic sensors based on hybrid phenyl-silica xerogel films to detect n-hexane: determination of the isosteric enthalpy of adsorption 

      Echeverría Morrás, Jesús Upna; Calleja, Ignacio; Moriones Jiménez, Paula Upna; Garrido Segovia, Julián José Upna (Beilstein-Institut, 2017)   Artículo / Artikulua  OpenAccess
      We investigated the response of three fiber optic sensing elements prepared at pH 10 from phenyltriethoxysilane (PhTEOS) and tetraethylsilane (TEOS) mixtures with 30, 40, and 50% PhTEOS in the silicon precursor mixture. ...
    • 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  OpenAccess
      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 ...
    • Mobility of heavy metals in soils amended with sewage sludge 

      Morera Luzán, María Teresa Upna; Echeverría Morrás, Jesús Upna; Garrido Segovia, Julián José Upna (Agricultural Institute of Canada, 2001)   Artículo / Artikulua  OpenAccess
      Sewage sludges added to arable land can improve soil fertility and physical properties. However, the concentrations of heavy metals commonly found in sludges limits their application to soil. The purpose of this paper is ...
    • Phenyl siloxane hybrid xerogels: structure and porous texture 

      Moriones Jiménez, Paula Upna; Echeverría Morrás, Jesús Upna; Parra, Bernardo; Garrido Segovia, Julián José Upna (Springer US, 2019)   Artículo / Artikulua  OpenAccess
      The aim of this research is to investigate the effect of phenyltriethoxysilane (PhTEOS) and tetraethoxysilane (TEOS) molar ratios as silicon precursors on the structure and porous texture of xerogels. We have prepared ...
    • Síntesis y caracterización de xerogeles silíceos híbridos (RTEOS/TEOS; R=P, Ph). Separación y purificación de gases mediante cromatografía 

      Moriones Jiménez, Paula Upna (2016)   Tesis doctoral / Doktoretza tesia  OpenAccess
      Esta investigación aborda la síntesis de materiales híbridos mediante proceso sol-gel utilizando diferentes condiciones de síntesis como el pH, temperatura y proporción precursor-disolvente obteniendo una amplia variedad ...
    • Strategies for fabrication of hydrogen peroxide sensors based on electrostatic self-assembly (ESA) method 

      Del Villar, Ignacio Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Echeverría Morrás, Jesús Upna; Claus, Richard O. (Elsevier, 2004)   Artículo / Artikulua  OpenAccess
      An optical fiber sensor has been fabricated for detection of 5 M–0.1mM concentrations of hydrogen peroxide with a linear response. The deposition method used is electrostatic self-assembly (ESA) of polymer cationic and ...