BackBrowsing Artículos by Subject "PHYSICS, CONDENSED MATTER"
Now showing items 1-20 of 23
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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 ... -
Ab initio calculation of low-energy collective charge-density excitations in MgB2
(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 ... -
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 ... -
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 ... -
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 ... -
Energy loss of charged particles moving parallel to a magnesium surface
García Vergniory, Maia; 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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
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 ... -
Manipulation of domain wall dynamics in amorphous microwires through the magnetoelastic anisotropy
Zhukov Egorova, Arkady Pavlovich; Blanco Aranguren, Juan María ; ; ; 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 ... -
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 ... -
Nanostructured giant magneto-impedance multilayers deposited onto flexible substrates for low pressure sensing
(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. ... -
Nonlinear magnetic vortex dynamics in a circular nanodot excited by spin-polarized current
(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 ... -
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 ... -
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, ... -
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 ... -
Pumped double quantum dot with spin-orbit coupling
(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 ... -
Role of occupied d bands in the dynamics of excited electrons and holes in Ag
; Pitarke de la Torre, José María; ; ; (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 ...