1,720,964 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
Study and 3D texturing of optical glasses by femtosecond laser for infrared applications
No full textDe nombreuses recherches sont aujourd'hui menées afin de miniaturiser et simplifier les caméras infrarouges dans le but de les intégrer à de petits porteurs tels que des micro drones. L'objectif est de fonctionnaliser des composants habituellement inutilisables en conception optique tels que les filtres ainsi que de mieux corriger les aberrations optiques. Dans ce cadre, la texturation par laser femtoseconde permet de créer des gradients d'indice de réfraction à l'intérieur de la matière. La flexibilité de la technique pourrait permettre la fabrication de composants optiques non-conventionnels. Dans ce contexte, nous avons étudié la méthode de la texturation par laser femtoseconde afin de créer des lentilles à gradient d'indice dans quatre matériaux spécifiques et dans le but de simplifier des caméras infrarouges. Trois types de lentilles à gradient d'indice ont été modélisées : une lentille boule à gradient d'indice sphérique permettant de corriger les aberrations optiques, une lentille plate à gradient d'indice de petit diamètre permettant de simplifier une caméra dans le LWIR et une lentille de Fresnel plate à gradient d'indice permettant de simplifier une caméra cryogénique dans le MWIR. Les lentilles plates ont ensuite été fabriquées et partiellement caractérisées. Cette étude a ainsi permis de montrer la capacité de la texturation par laser femtoseconde à fabriquer des optiques à gradient d'indice.Miniaturizing and simplifying infrared optical systems is a research area of great interest nowadays in order to integrate them into small carriers such as micro-UAVs. The objective is to functionalize components usually unusable in optical design such as filters and to better correct optical aberrations. In this context, femtosecond laser writing allows to create a gradient index inside the material. The flexibility of the technique could allow the fabrication of unconventional optical components. In this context, we have studied the femtosecond laser writing method to create gradient index lenses in four specific materials for the purpose of simplifying infrared cameras. Three types of gradient index lenses were modeled: a spherical gradient index ball lens to correct optical aberrations, a small diameter gradient index flat lens to simplify a camera in the LWIR, and a gradient index flat Fresnel lens to simplify a cryogenic camera in the MWIR. The flat lenses were then fabricated and partially characterized. This study has shown the ability of femtosecond laser texturing to fabricate gradient index optics
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
Etude et texturation 3D de lames optiques par laser femtoseconde pour des applications infrarouges
No full textMiniaturizing and simplifying infrared optical systems is a research area of great interest nowadays in order to integrate them into small carriers such as micro-UAVs. The objective is to functionalize components usually unusable in optical design such as filters and to better correct optical aberrations. In this context, femtosecond laser writing allows to create a gradient index inside the material. The flexibility of the technique could allow the fabrication of unconventional optical components. In this context, we have studied the femtosecond laser writing method to create gradient index lenses in four specific materials for the purpose of simplifying infrared cameras. Three types of gradient index lenses were modeled: a spherical gradient index ball lens to correct optical aberrations, a small diameter gradient index flat lens to simplify a camera in the LWIR, and a gradient index flat Fresnel lens to simplify a cryogenic camera in the MWIR. The flat lenses were then fabricated and partially characterized. This study has shown the ability of femtosecond laser texturing to fabricate gradient index optics.De nombreuses recherches sont aujourd'hui menées afin de miniaturiser et simplifier les caméras infrarouges dans le but de les intégrer à de petits porteurs tels que des micro drones. L'objectif est de fonctionnaliser des composants habituellement inutilisables en conception optique tels que les filtres ainsi que de mieux corriger les aberrations optiques. Dans ce cadre, la texturation par laser femtoseconde permet de créer des gradients d'indice de réfraction à l'intérieur de la matière. La flexibilité de la technique pourrait permettre la fabrication de composants optiques non-conventionnels. Dans ce contexte, nous avons étudié la méthode de la texturation par laser femtoseconde afin de créer des lentilles à gradient d'indice dans quatre matériaux spécifiques et dans le but de simplifier des caméras infrarouges. Trois types de lentilles à gradient d'indice ont été modélisées : une lentille boule à gradient d'indice sphérique permettant de corriger les aberrations optiques, une lentille plate à gradient d'indice de petit diamètre permettant de simplifier une caméra dans le LWIR et une lentille de Fresnel plate à gradient d'indice permettant de simplifier une caméra cryogénique dans le MWIR. Les lentilles plates ont ensuite été fabriquées et partiellement caractérisées. Cette étude a ainsi permis de montrer la capacité de la texturation par laser femtoseconde à fabriquer des optiques à gradient d'indice
Etude et texturation 3D de lames optiques par laser femtoseconde pour des applications infrarouges
No full textMiniaturizing and simplifying infrared optical systems is a research area of great interest nowadays in order to integrate them into small carriers such as micro-UAVs. The objective is to functionalize components usually unusable in optical design such as filters and to better correct optical aberrations. In this context, femtosecond laser writing allows to create a gradient index inside the material. The flexibility of the technique could allow the fabrication of unconventional optical components. In this context, we have studied the femtosecond laser writing method to create gradient index lenses in four specific materials for the purpose of simplifying infrared cameras. Three types of gradient index lenses were modeled: a spherical gradient index ball lens to correct optical aberrations, a small diameter gradient index flat lens to simplify a camera in the LWIR, and a gradient index flat Fresnel lens to simplify a cryogenic camera in the MWIR. The flat lenses were then fabricated and partially characterized. This study has shown the ability of femtosecond laser texturing to fabricate gradient index optics.De nombreuses recherches sont aujourd'hui menées afin de miniaturiser et simplifier les caméras infrarouges dans le but de les intégrer à de petits porteurs tels que des micro drones. L'objectif est de fonctionnaliser des composants habituellement inutilisables en conception optique tels que les filtres ainsi que de mieux corriger les aberrations optiques. Dans ce cadre, la texturation par laser femtoseconde permet de créer des gradients d'indice de réfraction à l'intérieur de la matière. La flexibilité de la technique pourrait permettre la fabrication de composants optiques non-conventionnels. Dans ce contexte, nous avons étudié la méthode de la texturation par laser femtoseconde afin de créer des lentilles à gradient d'indice dans quatre matériaux spécifiques et dans le but de simplifier des caméras infrarouges. Trois types de lentilles à gradient d'indice ont été modélisées : une lentille boule à gradient d'indice sphérique permettant de corriger les aberrations optiques, une lentille plate à gradient d'indice de petit diamètre permettant de simplifier une caméra dans le LWIR et une lentille de Fresnel plate à gradient d'indice permettant de simplifier une caméra cryogénique dans le MWIR. Les lentilles plates ont ensuite été fabriquées et partiellement caractérisées. Cette étude a ainsi permis de montrer la capacité de la texturation par laser femtoseconde à fabriquer des optiques à gradient d'indice
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
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