The interest of science shops for universities: The case of the UC3M-INAECU Science Shop

This paper has been presented at Open Science International Staff Week celebrated in Getafe (Madrid) - November 6-8, 2019

Adsorbate surface diffusion: The role of incoherent tunneling in light particle motion

The role of incoherent tunneling in the diffusion of light atoms on surfaces is investigated. With this purpose, a Chudley-Elliot master equation constrained to nearest neighbors is considered within the Grabert-Weiss approach to quantum diffusion in periodic lattices. This model is applied to recent measurements of atomic H and D on Pt(111), rendering friction coefficients that are in the range of those available in the literature for other species of adsorbates. A simple extension of the model has also been considered to evaluate the relationship between coverage and tunneling, and therefore the feasibility of the approach. An increase of the tunneling rate has been observed as the surface coverage decreases.Comment: 7 pages, 2 figures; important reorganization of the work (including title changes

Phonon lineshapes in atom-surface scattering

Phonon lineshapes in atom-surface scattering are obtained from a simple stochastic model based on the so-called Caldeira-Leggett Hamiltonian. In this single-bath model, the excited phonon resulting from a creation or annihilation event is coupled to a thermal bath consisting of an infinite number of harmonic oscillators, namely the bath phonons. The diagonalization of the corresponding Hamiltonian leads to a renormalization of the phonon frequencies in terms of the phonon friction or damping coefficient. Moreover, when there are adsorbates on the surface, this single-bath model can be extended to a two-bath model accounting for the effect induced by the adsorbates on the phonon lineshapes as well as their corresponding lineshapes.Comment: 14 pages, 2 figure

Quantum Markovian activated surface diffusion of interacting adsorbates

A quantum Markovian activated atom-surface diffusion model with interacting adsorbates is proposed for the intermediate scattering function, which is shown to be complex-valued and factorizable into a classical-like and a quantum-mechanical factor. Applications to the diffusion of Na atoms on flat (weakly corrugated) and corrugated-Cu(001) surfaces at different coverages and surface temperatures are analyzed. Quantum effects are relevant to diffusion at low surface temperatures and coverages even for relatively heavy particles, such as Na atoms, where transport by tunneling is absent.Comment: 6 pages, 4 figure

Ionosphere/Plasmasphere sounding with ground and space-based GNSS observations

Applying a methodology developed and tested in previous studies, the contribution from the ionospheric and plasmaspheric regions to the total electron content (measured by ground receivers) is analyzed. The method is based in the electron density profiles retrieved from radio occultations observed with low Earth orbit satellites, combined with an accurate empirical modeling of the topside-ionosphere electron density. The results of a climatological study of the fractional electron content from the ionospheric region are presented for a year of low solar activity. It is shown that a simple parametric model can be used to reproduce the electron content variations in the ionosphere and the plasmasphere between sunrise and midday, the period of the day showing the largest electron content variability.Peer ReviewedPostprint (author's final draft

Stochastic theory of lineshape broadening in quasielastic He atom scattering with interacting adsorbates

The activated surface diffusion of interacting adsorbates is described in terms of the so-called interacting single adsorbate approximation, which is applied to the diffusion of Na atoms on Cu(001) for coverages up to 20% in quasielastic He atom scattering experiments. This approximation essentially consists of solving the standard Langevin equation with two noise sources and frictions: a Gaussian white noise accounting for the friction with the substrate, and a white shot noise characterized by a collisional friction simulating the adsorbate-adsorbate collisions. The broadenings undergone by the quasielastic peak are found to be in very good agreement with the experimental data reported at two surface temperatures 200 and 300 K.Comment: 6 pages, 3 figure

¿Existe relación entre los perfiles de investigación de los IPs y la calificación de sus propuestas de investigación? El caso de ciencias sociales

El objetivo del presente estudio es determinar y comparar las características de la actividad científica contenida en el curriculum vitae (CV) de los investigadores principales de las propuestas de investigación del Plan Nacional de I+D+I 2004-2007, calificadas como excelentes o cuestionables por la Agencia Nacional de Evaluación y Prospectiva (ANEP) en el área Ciencias Sociales. Se ha trabajado con un total de 149 propuestas de investigación que se distribuyen en: 62 propuestas de investigación excelentes y 87 cuestionables. Entre los resultados hay que destacar, el 10% del total de las propuestas solicitadas obtuvieron calificación excelente y el 13% cuestionable. En lo que se refiere a los datos del CV se han analizado el 83% de los CV de investigadores de propuestas excelentes y el 77% de los CV de los investigadores de propuestas cuestionables. La utilización de esta fuente ha permitido identificar y categorizar el perfil científico de los investigadores analizados en función de la investigación pública competitiva y con empresas que ha tenido financiación, la movilidad internacional, la formación de investigadores y la producción científica. Tanto las propuestas de investigación como los CV se han clasificado según la subárea de Ciencias Sociales-ANEP en la que fueron evaluadas.Abstract: The present study aims at determining and comparing the characteristics of scientific activity described in the curricula vitae (CV) of the head researchers appearing in Social Sciences proposals for projects under the Spanish National R&D+I Plan, 2004-2007. In all, 149 proposals were studied: 62 were classified as excellent and 87 as questionable by the National Evaluation and Foresight Agency (Spanish initials, ANEP), accounting respectively for 10% and 13% of all submitted proposals. In the case of the researchers’ CVs, 83% of excellent proposals and 77% of questionable ones were studied. The advantage of using curricula as the source of the raw data was that the scientific profile of the researchers analysed could be identified and classified on the basis of funded research, international mobility, researcher training and scientific production. Both the research proposals and the CVs have been classified according to the of Social Sciences-ANEP sub area in which they were evaluated.PublicadoPublicad

Bibliometric and Altmetric Analysis of Three Social Science Disciplines

This article analyses scientific publications of international prestige in three social science disciplines (communication, economics, and sociology) to identify possible productionpatterns. Emphasis is placed on the study of impact and visibility, both through bibliometric and altmetric indicators to determine similarities and differences and to establish possible inter-variable relationships. The use of measures such as the presence in social media for the study of the visibility of documents is discussed. A total of 112,300 papers published from 2013 to 2015 in the three disciplines analyzed was retrieved from the Social Science Citation Index (SSCI). Economics accounted for the largest number and was observed to have a "stable" and consolidated output profile. Collaboration, impact, and visibility were found to be inter-related in the three fields. The proportion of papers with mentions in the social media was high (around 50%) in communication and sociology, suggesting a relationship between the object of study and the medium for disseminating the findings. Tweets were the most common type of mentions. While the correlation between academic impact (citation/doc) and mentions in blog posts and tweets was observed to be low, the percentage of papers cited (78 to 96%) and the mean number of citations per paper were greater among those with than those without mentions in the social media (especially those mentioned in Google+, MSM, videos, and Wikipedia). The proportion of open access (OA) papers with mentions in the social media was higher than the percentage of open access papers as a whole in two of the threedisciplines

A generalized Chudley-Elliott vibration-jump model in activated atom surface diffusion

Here the authors provide a generalized Chudley-Elliott expression for activated atom surface diffusion which takes into account the coupling between both low-frequency vibrational motion (namely, the frustrated translational modes) and diffusion. This expression is derived within the Gaussian approximation framework for the intermediate scattering function at low coverage. Moreover, inelastic contributions (arising from creation and annihilation processes) to the full width at half maximum of the quasi-elastic peak are also obtained.Comment: (5 pages, 2 figures; revised version

Bibliometric and Altmetric Analysis of Three Social Science Disciplines

This article analyses scientific publications of international prestige in three social science disciplines (communication, economics, and sociology) to identify possible production patterns. Emphasis is placed on the study of impact and visibility, both through bibliometric and altmetric indicators to determine similarities and differences and to establish possible inter-variable relationships. The use of measures such as the presence in social media for the study of the visibility of documents is discussed. A total of 112,300 papers published from 2013 to 2015 in the three disciplines analyzed was retrieved from the Social Science Citation Index (SSCI). Economics accounted for the largest number and was observed to have a “stable” and consolidated output profile. Collaboration, impact, and visibility were found to be inter-related in the three fields. The proportion of papers with mentions in the social media was high (around 50%) in communication and sociology, suggesting a relationship between the object of study and the medium for disseminating the findings. Tweets were the most common type of mentions. While the correlation between academic impact (citation/doc) and mentions in blog posts and tweets was observed to be low, the percentage of papers cited (78 to 96%) and the mean number of citations per paper were greater among those with than those without mentions in the social media (especially those mentioned in Google+, MSM, videos, and Wikipedia). The proportion of open access (OA) papers with mentions in the social media was higher than the percentage of open access papers as a whole in two of the three disciplines