Person: Brito López, Ricardo
Universidad Complutense de Madrid
Faculty / Institute
Estructura de la Materia, Física Térmica y Electrónica
Now showing 1 - 4 of 4
- PublicationEnskog kinetic theory for a model of a confined quasi-two-dimensional granular fluid(Amer Physical Soc, 2018-11-07) Garzó, Vicente; Brito López, Ricardo; Soto, RodrigoThe Navier-Stokes transport coefficients for a model of a confined quasi-two-dimensional granular gas of smooth inelastic hard spheres are derived from the Enskog kinetic equation. A normal solution to this kinetic equation is obtained via the Chapman-Enskog method for states close to the local homogeneous state. The analysis is performed to first order in spatial gradients, allowing the identification of the Navier-Stokes transport coefficients associated with the heat and momentum fluxes. The transport coefficients are determined from the solution to a set of coupled linear integral equations analogous to those for elastic collisions. These integral equations are solved by using the leading terms in a Sonine polynomial expansion. The results are particularized to the relevant state with stationary temperature, where explicit expressions for the Navier-Stokes transport coefficients are given in terms of the coefficient of restitution and the solid volume fraction. The present work extends to moderate densities previous results [Brey et al. Phys. Rev. E 91, 052201 (2015)] derived for low-density granular gases.
- PublicationTechnological research in the EU is less efficient than the world average. EU research policy risks Europeans' future(ELSEVIER SCIENCE BV, 2018-08) Rodríguez Navarro, Alonso; Brito López, RicardoWe have studied the efficiency of research in the EU by a percentile-based citation approach that analyzes the distribution of country papers among the world papers. Going up in the citation scale, the frequency of papers from efficient countries increases while the frequency from inefficient countries decreases. In the percentile-based approach, this trend, which is uniform at any citation level, is measured by the e(p) index that equals the P-top 1%/P-top 10% ratio. By using the ep index we demonstrate that EU research on fast-evolving technological topics is less efficient than the world average and that the EU is far from being able to compete with the most advanced countries. The ep index also shows that the USA is well ahead of the EU in both fast- and slow-evolving technologies, which suggests that the advantage of the USA over the EU in innovation is due to low research efficiency in the EU. In accord with some previous studies, our results show that the European Commission's ongoing claims about the excellence of EU research are based on a wrong diagnosis. The EU must focus its research policy on the improvement of its inefficient research. Otherwise, the future of Europeans is at risk. (C) 2018 Elsevier Ltd. All rights reserved.
- PublicationDesarrollo de material docente para la ejecución de prácticas de laboratorio virtuales mediante la creación de medios audiovisuales(2021-09-30) Rincón Cañibano, Cristina; Izquierdo Gil, Amparo; Valeriani, Chantal; García Fernández, Loreto; Brito López, Ricardo; Relaño Pérez, Armando; Diez Pastor, Guillermo; Barragán García, Vicenta María; Sanmartino Rodriguez, Julio; Díaz de Gregorio, Iván; Khayet Souhaimi, MohamedSe han desarrollado 4 videos audiovisuales ene español y en inglés, de 4 prácticas experimentales del Laboratorio de Física II de Termodinámica, del Grado de Física de la UCM.