1,720,982 research outputs found
Approches numériques pour les interfaces élastiques en milieu aléatoire
No full textWe discuss the universal dynamics of elastic interfaces in quenched random media. We focus on the relation between the rough geometry and collective transport properties in driven steady-states. Specially devised numerical algorithms allow us to analyze the equilibrium, creep, and depinning regimes of motion in minimal models. The relevance of our results for understanding domain wall experiments is outlined.Nous discutons les principaux résultats obtenus sur les propriétés universelles de la dynamique des interfaces élastiques en milieu aléatoire. Une attention particulière sera dédiée à la relation entre la géométrie rugueuse de lʼinterface en mouvement et ses proprietés de transport collectif. Les approches numériques développées permettent de décrire les propriétés dʼéquilibre, la dynamique de reptation et la transition de dépiégeage de lʼinterface. Nous discutons aussi la pertinence de nos résultats dans les expériences sur la dynamique des parois.Fil: Ferrero, Ezequiel E.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); ArgentinaFil: Bustingorry, Sebastian. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); ArgentinaFil: Kolton, Alejandro Benedykt. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); ArgentinaFil: Rosso, Alberto. Centre National de la Recherche Scientifique; Francia. Universite Paris Sud; Franci
Critical behavior and out-of-equilibrium dynamics of a two-dimensional Ising model with dynamic couplings
Full text linkWe study the critical behavior and the out-of-equilibrium dynamics of a two-dimensional Ising model with non-static interactions. In our model, bonds are dynamically changing according to a majority rule depending on the set of closest neighbors of each spin pair, which prevents the system from ordering in a full ferromagnetic or antiferromagnetic state. Using a parallel-tempering Monte Carlo algorithm, we find that the model undergoes a continuous phase transition at finite temperature, which belongs to the Ising universality class. The properties of the bond structure and the ground-state entropy are also studied. Finally, we analyze the out-of-equilibrium dynamics which displays typical glassy characteristicsat a temperature well below the critical one.Fil: Pinto, Oscar Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro de Investigaciones y Transferencia de Santiago del Estero; ArgentinaFil: Romá, Federico José. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico San Luis. Instituto de Física Aplicada; ArgentinaFil: Bustingorry, Sebastian. Comision Nacional de Energia Atomica. Gerencia D/area Invest y Aplicaciones No Nucleares. Gerencia de Fisica (cab). Grupo de Teoria de Solidos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
Multiscaling analysis of ferroelectric domain wall roughness
Full text linkUsing multiscaling analysis, we compare the characteristic roughening of ferroelectric domain walls in Pb(Zr0.2Ti0.8)O3 thin films with numerical simulations of weakly pinned one-dimensional interfaces. Although at length scales up to LMA ≥ 5 μm the ferroelectric domain walls behave similarly to the numerical interfaces, showing a simple monoaffine scaling (with a well-defined roughness exponent ζ), we demonstrate more complex scaling at higher length scales, making the walls globally multiaffine (varying ζ at different observation length scales). The dominant contributions to this multiaffine scaling appear to be very localized variations in the disorder potential, possibly related to dislocation defects present in the substrate.Fil: Guyonnet, J.. Universidad de Ginebra; SuizaFil: Agoritsas, E.. Universidad de Ginebra; SuizaFil: Bustingorry, Sebastian. Comisión Nacional de Energía Atómica. Gerencia del Area de Investigación y Aplicaciones No Nucleares. Gerencia de Física (Centro Atómico Bariloche); Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Giamarchi, T.. Universidad de Ginebra; SuizaFil: Paruch, P.. Universidad de Ginebra; Suiz
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Women in physics in Argentina: A comparative statistical analysis
Full text linkMotivados por la necesidad de contar con información detallada sobre la situación actual de las mujeres físicas en Argentina, se desarrolló un estudio estadístico focalizado en la disciplina Física de la Carrera del Investigador Científico (CIC) del CONICET. Se relevaron datos de la composición por género de las categorías de investigador y se analizó su evolución en los últimos 20 años. Los resultados obtenidos permiten evaluar el llamado techo de cristal y su dinámica, mostrando que parte de su origen reside en las desigualdades observadas en el proceso de promoción entre categorías. Un análisis del crecimiento del número de investigadores por género a lo largo de este período muestra que la fracción de mujeres proyectada es aproximadamente 30 %. Este resultado indica que no se alcanzará la equidad esperada a menos que se articulen mecanismos que aumenten la razón de ingresos de mujeres a la CIC. Los resultados obtenidos se comparan con el conjunto de investigadores en la Gran Área de Ciencias Exactas y Naturales y con el total de investigadores en CONICET.Urged by the need of detailed information concerning the current situation of women in Physics in Argentina, we performed a statistical study focused on the Physics discipline within the hierarchical structure of researchers with permanent positions at CONICET. We analyzed gender composition data of the different career stages and studied its evolution in the past 20 years. The obtained results reveal the well-known glass ceiling and its dynamics, unveiling its relationship with differences arisen during the promotion process in the researchers' career. The analysis of evolution of the percentage of women in Physics shows that its projection would not surpass 30%. This result indicates that gender balance will not be reached unless novel mechanisms are proposed, actively promoting the incorporation of women as researchers. The results presented for Physics are also compared with others disciplines in Natural and Exact Sciences and the full population of researchers in all areas working in CONICET.Fil: Bustingorry, Sebastian. Comisión Nacional de Energía Atómica. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología. - Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Unidad Ejecutora Instituto de Nanociencia y Nanotecnología; ArgentinaFil: Moro, Esteban Gonzalo. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Laguna, Maria Fabiana. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro; Argentin
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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