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
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
Solid hybrid electrolytes development based on ionic liquids immobilized on metal oxide nanoparticles for lithium batteries
No full textLes liquides ioniques (LIs) possèdent des propriétés uniques prometteuses pour l'amélioration de la sécurité des batteries du fait de leur grande stabilité thermique et de leur volatilité négligeable. Par ailleurs, ils sont dotés d'une conductivité ionique élevée (10-3 S/cm à 10-2 S/cm à température ambiante) et d'une large fenêtre de stabilité électrochimique (jusqu'à 6 V dans le cas des sels de pipéridinium et de pyrrolidinium). Cependant, la dissolution d'un sel [Li+][X-] dans un liquide ionique [A+][X-] conduit à un électrolyte liquide ionique ayant une viscosité accrue, une conductivité plus faible et, par conséquent, entrave son utilisation en tant qu'électrolyte. Ce manuscrit présente le développement de matériaux hybrides organique–inorganique à partir de liquides ioniques immobilisés sur des nanoparticules d'oxydes métalliques. L'électrolyte solide (sans solvant) obtenu permet de réduire le risque de fuite et d'incendie. Par ailleurs, les conductivités atteintes sont comparables à celles des systèmes polymères rapportés dans la littérature. Nous avons concentré nos recherches autour d'un panel de liquides ioniques dérivés de sels d'imidazolium et de leur greffage sur des nanoparticules de silice et d'oxyde de zirconium(IV). Nous rapportons ici un nouvel électrolyte préparé en deux étapes à partir de la coordination d'un sel d'imidazolium fonctionnalisé par un acide carboxylique. Après optimisation de la teneur en sel de lithium, une conductivité ionique stable entre 80 °C et 25 °C est obtenue (respectivement de 0,6 x 10-4 S/cm à 0,15 x 10-4 S/cm). D'autre part, l'impact de la structure chimique des liquides ioniques sur les propriétés de transport ionique est abordé. Entre autres, l'influence de la longueur des chaînes carbonées, de la fonction d'ancrage, de la nature et de la structure du support a été étudiée. La compréhension de ce transport a mobilisé l'analyse des électrolytes par spectroscopie d'impédance électrochimique et par RMN à l'état solide. Enfin, des tests d'intégration en demi-cellules concluent ce manuscritIonic liquids (ILs) have attractive unique properties for safer batteries, including important thermal stability and negligible volatility. In addition, they have a high ionic conductivity (10-3 to 10-2 S/cm at room temperature) and a wide electrochemical stability window (up to 6 V in the case of piperidinium and pyrrolidinium salts). However, the dissolution of a [Li+][X-] salt in the ionic liquid [A+][X-] leads to an ionic liquid electrolyte (ILE) with increased viscosity, lower conductivity, and as a result, hinders its use as an electrolyte.This manuscript describes the development of hybrid organic–inorganic materials based on ionic liquids immobilized on the surface of metal oxide nanoparticles. A solid electrolyte thus obtained (solvent-free) reduces the risk of batteries ignition as well as electrolyte leakage. In addition, the reached conductivities are comparable to those of the polymer systems reported in the literature. We focused our research on a panel of ionic liquids derived from imidazolium salts and their grafting on silica and zirconium(IV) oxide nanoparticles. We report herein a new electrolyte prepared from the coordination of carboxylic acid functionalized imidazolium salt. After optimization of the lithium salt content, a stable ionic conductivity is obtained between 80 °C and 25 °C (respectively from 0,6 x 10-4 S/cm to 0,15 x 10-4 S/cm). Furthermore, the impact of the chemical structure of the ionic liquid on the lithium ions transport is discussed. Among others, the influence of the carbon chains length, the anchoring function, the nature, and the structure of the support was studied. This research has involved electrolytes analysis by electrochemical impedance spectroscopy and solid-state NMR. Finally, integration tests in half-cell models conclude this manuscrip
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Développement d'électrolytes hybrides solides à partir de liquides ioniques immobilisés sur nanoparticules d'oxydes métalliques pour les batteries au lithium
No full textIonic liquids (ILs) have attractive unique properties for safer batteries, including important thermal stability and negligible volatility. In addition, they have a high ionic conductivity (10-3 to 10-2 S/cm at room temperature) and a wide electrochemical stability window (up to 6 V in the case of piperidinium and pyrrolidinium salts). However, the dissolution of a [Li+][X-] salt in the ionic liquid [A+][X-] leads to an ionic liquid electrolyte (ILE) with increased viscosity, lower conductivity, and as a result, hinders its use as an electrolyte.This manuscript describes the development of hybrid organic–inorganic materials based on ionic liquids immobilized on the surface of metal oxide nanoparticles. A solid electrolyte thus obtained (solvent-free) reduces the risk of batteries ignition as well as electrolyte leakage. In addition, the reached conductivities are comparable to those of the polymer systems reported in the literature. We focused our research on a panel of ionic liquids derived from imidazolium salts and their grafting on silica and zirconium(IV) oxide nanoparticles. We report herein a new electrolyte prepared from the coordination of carboxylic acid functionalized imidazolium salt. After optimization of the lithium salt content, a stable ionic conductivity is obtained between 80 °C and 25 °C (respectively from 0,6 x 10-4 S/cm to 0,15 x 10-4 S/cm). Furthermore, the impact of the chemical structure of the ionic liquid on the lithium ions transport is discussed. Among others, the influence of the carbon chains length, the anchoring function, the nature, and the structure of the support was studied. This research has involved electrolytes analysis by electrochemical impedance spectroscopy and solid-state NMR. Finally, integration tests in half-cell models conclude this manuscriptLes liquides ioniques (LIs) possèdent des propriétés uniques prometteuses pour l'amélioration de la sécurité des batteries du fait de leur grande stabilité thermique et de leur volatilité négligeable. Par ailleurs, ils sont dotés d'une conductivité ionique élevée (10-3 S/cm à 10-2 S/cm à température ambiante) et d'une large fenêtre de stabilité électrochimique (jusqu'à 6 V dans le cas des sels de pipéridinium et de pyrrolidinium). Cependant, la dissolution d'un sel [Li+][X-] dans un liquide ionique [A+][X-] conduit à un électrolyte liquide ionique ayant une viscosité accrue, une conductivité plus faible et, par conséquent, entrave son utilisation en tant qu'électrolyte. Ce manuscrit présente le développement de matériaux hybrides organique–inorganique à partir de liquides ioniques immobilisés sur des nanoparticules d'oxydes métalliques. L'électrolyte solide (sans solvant) obtenu permet de réduire le risque de fuite et d'incendie. Par ailleurs, les conductivités atteintes sont comparables à celles des systèmes polymères rapportés dans la littérature. Nous avons concentré nos recherches autour d'un panel de liquides ioniques dérivés de sels d'imidazolium et de leur greffage sur des nanoparticules de silice et d'oxyde de zirconium(IV). Nous rapportons ici un nouvel électrolyte préparé en deux étapes à partir de la coordination d'un sel d'imidazolium fonctionnalisé par un acide carboxylique. Après optimisation de la teneur en sel de lithium, une conductivité ionique stable entre 80 °C et 25 °C est obtenue (respectivement de 0,6 x 10-4 S/cm à 0,15 x 10-4 S/cm). D'autre part, l'impact de la structure chimique des liquides ioniques sur les propriétés de transport ionique est abordé. Entre autres, l'influence de la longueur des chaînes carbonées, de la fonction d'ancrage, de la nature et de la structure du support a été étudiée. La compréhension de ce transport a mobilisé l'analyse des électrolytes par spectroscopie d'impédance électrochimique et par RMN à l'état solide. Enfin, des tests d'intégration en demi-cellules concluent ce manuscri
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