1,720,958 research outputs found
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
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
Mechanical properties of olivine glass from MD simulations
No full textLa mise en évidence de l'apparition d'une phase amorphe de composition Mg2SiO4 aux joints de grains d'échantillons d'olivine polycristalline déformés motive aujourd'hui plusieurs études du comportement mécanique du verre silicaté de composition olivine.Dans le cadre de ces travaux de thèse, nous proposons une étude par simulations numériques à l'échelle atomique des propriétés mécaniques de verre de composition Mg2SiO4. Plus spécifiquement, les travaux présentés correspondent à des essais de cisaillement réalisés par statique ou dynamique moléculaire. Au cours d'un essai de cisaillement, la courbe contrainte déformation fait apparaître de nombreuses chutes de contrainte caractéristique du développement d'une activité plastique au sein du volume de l'échantillon simulé. Nous montrons ainsi que la déformation plastique du verre fait intervenir des événements plastiques correspondant à des réarrangements atomiques locaux qui se localisent au sein de domaines appelés Shear Transformation Zones (STZ). Pour le verre de composition Mg2SiO4, les STZ présentent une taille de quelques angströms, faisant intervenir une dizaine d'atomes. La modélisation de ces STZ par des inclusions sphériques d'Eshelby nous permet en plus d'associer à ces réarrangements atomiques un tenseur de transformation plastique moyen qui traduit le caractère déviatorique des réarrangements.Les simulations de dynamique moléculaire montrent de plus que la contrainte d'écoulement du verre est fonction de la vitesse de sollicitation et de la température de l'essai. Ainsi, nous montrons que l'écoulement plastique du verre opère à plus basse contrainte pour des températures d'essais élevées ce qui traduit le caractère thermiquement activé des événements plastiques. Nos simulations de dynamique moléculaire nous conduisent alors à proposer une loi d'écoulement bâtie sur un comportement de type Herschel-Buckley modifié pour tenir compte du caractère thermiquement activé des STZ. L'extrapolation du comportement mécanique du verre hors de l'échelle de temps caractéristique de la dynamique moléculaire nous permet enfin de confronter nos prédictions aux données expérimentales recueillies récemment à partir d'essais de relaxation ou de nano-indentation réalisés sur des films amorphes de composition olivineThe identification of the appearance of an amorphous phase with the composition Mg2SiO4 at the grain boundaries of deformed polycrystalline olivine samples currently motivates several studies on the mechanical behavior of silicate glass with olivine composition.In the context of this thesis work, we propose a study using numerical simulations at the atomic scale to investigate the mechanical properties of Mg2SiO4 glass. More specifically, the presented work corresponds to shear tests conducted through static or molecular dynamics simulations. During a shear test, the stress-strain curve reveals numerous stress drops characteristic of the development of plastic activity within the simulated sample volume. We thus demonstrate that the plastic deformation of the glass involves plastic events corresponding to local atomic rearrangements localized within regions called Shear Transformation Zones (STZ). For Mg2SiO4 glass, these STZ have a size on the order of few angstroms, involving a tens of atoms. Modeling these STZ with Eshelby spherical inclusions allows us to associate a mean plastic transformation tensor with these atomic rearrangements, reflecting their deviatoric character.Furthermore, molecular dynamics simulations show that the glass flow stress depends on the loading rate and the test temperature. Therefore, we show that plastic flow in the glass occurs at a lower stress for elevated test temperatures, indicating the thermally activated nature of plastic events. Our molecular dynamics simulations lead us to propose a flow law based on a modified Herschel-Bulkley behavior to account for the thermally activated nature of STZ. Finally, extrapolating the mechanical behavior of the glass beyond the characteristic time scale of molecular dynamics allows us to compare our predictions to experimental data recently obtained from relaxation tests or nano-indentation performed on amorphous films with olivine composition
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Modélisation du comportement mécanique de verres d'olivine par dynamique moléculaire
No full textThe identification of the appearance of an amorphous phase with the composition Mg2SiO4 at the grain boundaries of deformed polycrystalline olivine samples currently motivates several studies on the mechanical behavior of silicate glass with olivine composition.In the context of this thesis work, we propose a study using numerical simulations at the atomic scale to investigate the mechanical properties of Mg2SiO4 glass. More specifically, the presented work corresponds to shear tests conducted through static or molecular dynamics simulations. During a shear test, the stress-strain curve reveals numerous stress drops characteristic of the development of plastic activity within the simulated sample volume. We thus demonstrate that the plastic deformation of the glass involves plastic events corresponding to local atomic rearrangements localized within regions called Shear Transformation Zones (STZ). For Mg2SiO4 glass, these STZ have a size on the order of few angstroms, involving a tens of atoms. Modeling these STZ with Eshelby spherical inclusions allows us to associate a mean plastic transformation tensor with these atomic rearrangements, reflecting their deviatoric character.Furthermore, molecular dynamics simulations show that the glass flow stress depends on the loading rate and the test temperature. Therefore, we show that plastic flow in the glass occurs at a lower stress for elevated test temperatures, indicating the thermally activated nature of plastic events. Our molecular dynamics simulations lead us to propose a flow law based on a modified Herschel-Bulkley behavior to account for the thermally activated nature of STZ. Finally, extrapolating the mechanical behavior of the glass beyond the characteristic time scale of molecular dynamics allows us to compare our predictions to experimental data recently obtained from relaxation tests or nano-indentation performed on amorphous films with olivine composition.La mise en évidence de l'apparition d'une phase amorphe de composition Mg2SiO4 aux joints de grains d'échantillons d'olivine polycristalline déformés motive aujourd'hui plusieurs études du comportement mécanique du verre silicaté de composition olivine.Dans le cadre de ces travaux de thèse, nous proposons une étude par simulations numériques à l'échelle atomique des propriétés mécaniques de verre de composition Mg2SiO4. Plus spécifiquement, les travaux présentés correspondent à des essais de cisaillement réalisés par statique ou dynamique moléculaire. Au cours d'un essai de cisaillement, la courbe contrainte déformation fait apparaître de nombreuses chutes de contrainte caractéristique du développement d'une activité plastique au sein du volume de l'échantillon simulé. Nous montrons ainsi que la déformation plastique du verre fait intervenir des événements plastiques correspondant à des réarrangements atomiques locaux qui se localisent au sein de domaines appelés Shear Transformation Zones (STZ). Pour le verre de composition Mg2SiO4, les STZ présentent une taille de quelques angströms, faisant intervenir une dizaine d'atomes. La modélisation de ces STZ par des inclusions sphériques d'Eshelby nous permet en plus d'associer à ces réarrangements atomiques un tenseur de transformation plastique moyen qui traduit le caractère déviatorique des réarrangements.Les simulations de dynamique moléculaire montrent de plus que la contrainte d'écoulement du verre est fonction de la vitesse de sollicitation et de la température de l'essai. Ainsi, nous montrons que l'écoulement plastique du verre opère à plus basse contrainte pour des températures d'essais élevées ce qui traduit le caractère thermiquement activé des événements plastiques. Nos simulations de dynamique moléculaire nous conduisent alors à proposer une loi d'écoulement bâtie sur un comportement de type Herschel-Buckley modifié pour tenir compte du caractère thermiquement activé des STZ. L'extrapolation du comportement mécanique du verre hors de l'échelle de temps caractéristique de la dynamique moléculaire nous permet enfin de confronter nos prédictions aux données expérimentales recueillies récemment à partir d'essais de relaxation ou de nano-indentation réalisés sur des films amorphes de composition olivin
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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