1,720,956 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Towards new porous materials for the capture of interior odors
No full textLa pollution de l’air intérieur est celle à laquelle les êtres humains sont les plus exposés, passant environ 90% de leur temps en environnement intérieur (habitation, lieux de travail, véhicule...). A l’origine de cette pollution, le dégagement de Composés Organiques Volatils (COVs) conduisant, lors d’une exposition forte et/ou prolongée, à des effets sanitaires et/ou gênes olfactives.Les Metal-Organic Frameworks (MOFs) apparaissent comme des solides poreux très prometteurs pour leur capture. En effet, leur haut degré de modularité permet de façonner à dessein leur structure cristalline et leur composition chimique en fonction de l’application cible. Cette thèse vise à déterminer des propriétés physico-chimiques clés et nécessaires aux MOFs pour une adsorption efficace de COVs, en particulier ceux présents dans l’habitacle des véhicules. L’étude menée a impliqué la mise en place de deux protocoles analytiques expérimentaux, le premier permettant une sélection de matériaux qui seront analysés de manière plus approfondie par le deuxième protocole, ainsi qu’une étude théorique pour la modélisation des interactions COV-MOF. Grâce à l’ensemble de ces outils, les performances d’une dizaine de MOFs ont été évaluées pour l’adsorption de trois COVs différents et ce dans des conditions variées : corps purs, mélange de COVs, variabilité dans leurs concentrations, matériaux poreux seuls ou combinés, présence d’humidité, essais statiques ou dynamiques. Des propriétés clés ont ainsi pu être identifiées comme favorables à l’adsorption des COVs (espaceur aromatique, acidité de Lewis, acidité de Bronsted...).The impact of indoor air pollution is the most pronounced among humans, since about 90% of the time is spent indoors (home, workplace, vehicle ...). The origin of this pollution is partly due to the release of Volatile Organic Compounds (VOCs) that induces various health issues or olfactory discomfort when they are breathed in high concentration or during a prolonged period. Metal-Organic Frameworks (MOFs) appear as very promising materials for their capture. Indeed, their high degree of modularity allows to design the adequate structure and composition according to the targeted application.This Ph.D. project aims at studying the key physico-chemical properties required for MOFs to efficiently adsorb VOCs originating especially from car passenger compartment. The study involved the set-up of two analytical experimental protocols. The first one allowing a selection of materials that are further in-depth analyses by the second one, and coupled with a theoretical study for VOC-MOF interactions modeling. The performance of a series of ten MOFs was therefore evaluated against three typical VOCs under various conditions: pure component, mixture, humidity conditions, under dynamic and static states. Key parameters of the MOFs were thus identified for the efficient capture of VOCs (aromatic spacer, Lewis’s acidity, Bronsted acidity...)
Vers de nouveaux matériaux poreux pour l’adsorption d’odeurs de l'air habitacle
No full textThe impact of indoor air pollution is the most pronounced among humans, since about 90% of the time is spent indoors (home, workplace, vehicle ...). The origin of this pollution is partly due to the release of Volatile Organic Compounds (VOCs) that induces various health issues or olfactory discomfort when they are breathed in high concentration or during a prolonged period. Metal-Organic Frameworks (MOFs) appear as very promising materials for their capture. Indeed, their high degree of modularity allows to design the adequate structure and composition according to the targeted application.This Ph.D. project aims at studying the key physico-chemical properties required for MOFs to efficiently adsorb VOCs originating especially from car passenger compartment. The study involved the set-up of two analytical experimental protocols. The first one allowing a selection of materials that are further in-depth analyses by the second one, and coupled with a theoretical study for VOC-MOF interactions modeling. The performance of a series of ten MOFs was therefore evaluated against three typical VOCs under various conditions: pure component, mixture, humidity conditions, under dynamic and static states. Key parameters of the MOFs were thus identified for the efficient capture of VOCs (aromatic spacer, Lewis’s acidity, Bronsted acidity...).La pollution de l’air intérieur est celle à laquelle les êtres humains sont les plus exposés, passant environ 90% de leur temps en environnement intérieur (habitation, lieux de travail, véhicule...). A l’origine de cette pollution, le dégagement de Composés Organiques Volatils (COVs) conduisant, lors d’une exposition forte et/ou prolongée, à des effets sanitaires et/ou gênes olfactives.Les Metal-Organic Frameworks (MOFs) apparaissent comme des solides poreux très prometteurs pour leur capture. En effet, leur haut degré de modularité permet de façonner à dessein leur structure cristalline et leur composition chimique en fonction de l’application cible. Cette thèse vise à déterminer des propriétés physico-chimiques clés et nécessaires aux MOFs pour une adsorption efficace de COVs, en particulier ceux présents dans l’habitacle des véhicules. L’étude menée a impliqué la mise en place de deux protocoles analytiques expérimentaux, le premier permettant une sélection de matériaux qui seront analysés de manière plus approfondie par le deuxième protocole, ainsi qu’une étude théorique pour la modélisation des interactions COV-MOF. Grâce à l’ensemble de ces outils, les performances d’une dizaine de MOFs ont été évaluées pour l’adsorption de trois COVs différents et ce dans des conditions variées : corps purs, mélange de COVs, variabilité dans leurs concentrations, matériaux poreux seuls ou combinés, présence d’humidité, essais statiques ou dynamiques. Des propriétés clés ont ainsi pu être identifiées comme favorables à l’adsorption des COVs (espaceur aromatique, acidité de Lewis, acidité de Bronsted...)
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