Now showing items 1-20 of 23

    • Thumbnail

      A rational fraction polynomials model to study vertical dynamic wheel-rail interaction 

      Correa García, Nekane; García Vadillo, Ernesto; Santamaría Manrique, Javier; Gómez López, Josu (Elsevier, 2012-04)
      This paper presents a model designed to study vertical interactions between wheel and rail when the wheel moves over a rail welding. The model focuses on the spatial domain, and is drawn up in a simple fashion from track ...
    • Thumbnail

      Ab initio calculation of low-energy collective charge-density excitations in MgB2 

      Silkin, Viatcheslav M.; Balassis, A.; Echenique Landiribar, Pedro Miguel; Tchoulkov Savkin, Evgueni Vladimirovich (American Physical Society, 2009-08)
      We present ab initio time-dependent density-functional theory calculation results for low-energy collective electron excitations in MgB2. The existence of a long-lived collective excitation corresponding to coherent charge ...
    • Thumbnail

      Adaptive coatings based on polyaniline for direct 2D observation of diffusion processes in microfluidic systems 

      Florea, Larisa; Martin Mayor, Alain; Bou-Ali, M. Mounir; Meagher, Kate; Diamond, Dermot; Tutar, Mustafa; Benito López, Fernando (Elsevier, 2016-08)
      [EN] Therefore the understanding and proper evaluation of the flow and mixing behaviour at microscale becomes a very important issue. In this study, the diffusion behaviour of two reacting solutions of HCI and NaOH were ...
    • Thumbnail

      Biomolecule storage on non-modified thermoplastic microfluidic chip by ink-jet printing of ionogels 

      Tijero, María; Díez Ahedo, Ruth; Benito López, Fernando; Basabe Desmonts, Lourdes; Castro López, Vanessa; Valero, Ana (American Institute of Physics (AIP), 2015)
      [EN] This paper reports an innovative technique for reagents storage in microfluidic devices by means of a one-step UV-photoprintable ionogel-based microarray on non-modified polymeric substrates. Although the ionogel and ...
    • Thumbnail

      Dynamic optimization of track components to minimize rail corrugation 

      Oyarzabal de Celis, Olatz; Gómez López, Josu; Santamaría Manrique, Javier; García Vadillo, Ernesto (Elsevier, 2009-01)
      In this paper, the influence on corrugation of the most significant track parameters has been examined. After this parametric study, the optimization of the track parameters to minimize the undulatory wear growth has been ...
    • Thumbnail

      Energy loss of charged particles moving parallel to a magnesium surface 

      Vergniory, Maia G.; Silkin, Viatcheslav M.; García de Gurtubay Galligo, Idoia; Pitarke De La Torre, José María (American Physical Society, 2008-10)
      We present it ab initio calculations of the electronic energy loss of charged particles moving outside a magnesium surface, from a realistic description of the one-electron band structure and a full treatment of the dynamical ...
    • Thumbnail

      Exact-exchange Kohn-Sham potential, surface energy, and work function of jellium slabs 

      Horowitz, Claudio M.; Proetto, C. R.; Pitarke De La Torre, José María (American Physical Society, 2008-08)
      Exact-exchange self-consistent calculations of the Kohn-Sham potential, surface energy, and work function of jellium slabs are reported in the framework of the optimized effective potential (OEP) scheme of density functional ...
    • Thumbnail

      Exchange-Correlation Hole of a Generalized Gradient Approximation for Solids and Surfaces 

      Constantin, Lucian A.; Perdew, John P.; Pitarke De La Torre, José María (American Physical Society, 2009-02)
      We propose a generalized gradient approximation (GGA) for the angle- and system-averaged exchange-correlation hole of a many-electron system. This hole, which satisfies known exact constraints, recovers the Perdew-Burke-Ernzerhof ...
    • Thumbnail

      First-principles calculations of hot-electron lifetimes in metals 

      Campillo Santos, Igor; Silkin, Viatcheslav M.; Pitarke De La Torre, José María; Tchoulkov Savkin, Evgueni Vladimirovich; Rubio Secades, Angel; Echenique Landiribar, Pedro Miguel (American Physical Society, 2000)
      First-principles calculations' of the inelastic lifetime of low-energy electrons in Al, Mg, Be, and Cu are reported. Quasiparticle damping rates are evaluated from the: knowledge of the electron self-energy, which we compute ...
    • Thumbnail

      Fluidic flow delay by ionogel passive pumps in microfluidic paper-based analytical devices 

      Akyazi, Tugce; Sáez Castaño, Janire; Elizalde, Jorge; Benito López, Fernando (Elsevier, 2016-10-05)
      [EN] A new concept for fluid flow manipulation in microfluidic paper-based analytical devices (m-PADs) is presented by introducing ionogel materials as passive pumps. m-PADs were fabricated using a new doubleside contact ...
    • Thumbnail

      Low‑cost origami fabrication of 3D self‑aligned hybrid microfluidic structures 

      Sáez Castaño, Janire; Basabe Desmonts, Lourdes; Benito López, Fernando (Springer, 2016-08)
      [EN] 3D microfluidic device fabrication methods are normally quite expensive and tedious. In this paper, we present an easy and cheap alternative wherein thin cyclic olefin polymer (COP) sheets and pressure sensitive ...
    • Thumbnail

      Manipulation of domain wall dynamics in amorphous microwires through the magnetoelastic anisotropy 

      Zhukov Egorova, Arkady Pavlovich; Blanco Aranguren, Juan María; Ipatov, Mihail; Chizhik, Alexander; Zhukova Zhukova, Valentina (Springer, 2012-04)
      We studied the effect of magnetoelastic anisotropy on domain wall (DW) dynamics and remagnetization process of magnetically bistable Fe-Co-rich microwires with metallic nucleus diameters (from 1.4 to 22 mu m). We manipulated ...
    • Thumbnail

      Microcantilever arrays functionalised with spiropyran photoactive moieties as systems to measure photo-induced surface stress changes 

      Grogan, Catherine; Florea, Larisa; Koprivica, Slavica; Scarmagnani, Silvia; O’Neill, Luke; Lyng, Fiona; Pedreschi, Fran; Benito López, Fernando; Raiteri, Roberto (Elsevier, 2016-12)
      [EN] Herein we investigate the feasibility of detecting photo-induced surface stress changes using the deflection response of cantilevers. For this purpose, silicon microcantilevers have been functionalised with spiropyran ...
    • Thumbnail

      Nanostructured giant magneto-impedance multilayers deposited onto flexible substrates for low pressure sensing 

      Fernández Martín, Eduardo; Kourliandskaia, Galina; García Arribas, Alfredo; Svalov, Andrey (Springer, 2012-04)
      Nanostructured FeNi-based multilayers are very suitable for use as magnetic sensors using the giant magneto-impedance effect. New fields of application can be opened with these materials deposited onto flexible substrates. ...
    • Thumbnail

      Nonlinear magnetic vortex dynamics in a circular nanodot excited by spin-polarized current 

      Gusliyenko, Kostyantyn; Sukhostavets, Oksana; Berkov, Dmitry V. (Springer International Publishing, 2014-08-08)
      We investigate analytically and numerically nonlinear vortex spin torque oscillator dynamics in a circular magnetic nanodot induced by a spin-polarized current perpendicular to the dot plane. We use a generalized nonlinear ...
    • Thumbnail

      On the study of train-track dynamic interactions caused by rail welds on discrete supported rails 

      Correa García, Nekane; García Vadillo, Ernesto; Santamaría Manrique, Javier; Gómez López, Josu (Elsevier, 2014-06-15)
      The paper studies the influence of rail weld dip on wheel-rail contact dynamics, with particular reference to freight trains where it is important to increase the operating speed and also the load transported. This has ...
    • Thumbnail

      On-demand generation and removal of alginate biocompatible microvalves for flow control in microfluidics 

      Sáez Castaño, Janire; Etxebarria Elezgarai, Jaione; Antoñana Díez, Marta; Benito López, Fernando (Elsevier, 2016-10-29)
      [EN] This paper describes, for the first time, the use of alginate hydrogels as miniaturised microvalves within microfluidic devices. These biocompatible and biodegradable microvalves are generated in situ and on demand, ...
    • Thumbnail

      Position-dependent exact-exchange energy for slabs and semi-infinite jellium 

      Horowitz, Claudio M.; Constantin, Lucian A.; Proetto, C. R.; Pitarke De La Torre, José María (American Physical Society, 2009-12)
      The position-dependent exact-exchange energy per particle epsilon(x)(z) (defined as the interaction between a given electron at z and its exact-exchange hole) at metal surfaces is investigated, by using either jellium slabs ...
    • Thumbnail

      Pumped double quantum dot with spin-orbit coupling 

      Khomitsky, Denis; Sherman, Evgeny (Springer, 2011-03)
      We study driven by an external electric field quantum orbital and spin dynamics of electron in a one-dimensional double quantum dot with spin-orbit coupling. Two types of external perturbation are considered: a periodic ...
    • Thumbnail

      Role of occupied d bands in the dynamics of excited electrons and holes in Ag 

      García Lekue, A.; Pitarke De La Torre, José María; Tchoulkov Savkin, Evgueni Vladimirovich; Liebsch, A.; Echenique Landiribar, Pedro Miguel (American Physical Society, 2003)
      The role that occupied d bands play in the inelastic lifetime of bulk and surface states in Ag is investigated from the knowledge of the quasiparticle self-energy. In the case of bulk electrons, sp bands are taken to be ...