1,720,956 research outputs found
SPACE Labelling Tool
No full textThe SPectrogram Analysis and Cataloguing Environment (SPACE) tool is an
interactive python tool designed to label radio emission features of
interest in a time-frequency map (called "dynamic spectrum"). The
program uses Matplotlib's Polygon Selector widget to allow a user to
select and edit an undefined number of vertices on top of the dynamic
spectrum before closing the shape (polygon). Multiple polygons may be
drawn on any spectrum, and the feature name along with the coordinates
for each polygon vertex are saved into a ".json" file as per the
"Time-Frequency Catalogue" (TFCat) format along with other data such as
the feature id, observer name, and data units.</p
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
Generation and localization of radio sources of Jovian plasma emissions from 3D geometric simulations of Juno mission observation statistics
No full textDans la magnétosphère de Jupiter, l'instabilité maser-cyclotron, très bien étudiée, produit dans les régions polaires où le plasma est peu dense et magnétisé, le rayonnement radio auroral à des fréquences de quelques kHz à 40 MHz. D'autres émissions radio, beaucoup moins étudiées, sont produites dans les régions équatoriales, plus denses, à des fréquences inférieures à quelques centaines de kHz. Des mécanismes impliquant la conversion d'ondes électrostatiques ont été proposés pour générer ces émissions dites "plasma", mais aucun n'a fait consensus. Cette thèse porte sur l'étude des émissions plasma joviennes. Son but est d'identifier les mécanismes d'émission, les conditions physiques dans lesquelles ils opèrent, et d'en déduire la localisation des sources. Pour cela, j'ai tiré parti de la couverture spatiale unique des observations des instruments radio, plasma et champ magnétique de la sonde Juno, en orbite polaire autour de Jupiter depuis 2016, avec des périastres à très basse altitude au-dessus des pôles (<10000 km). J'ai contribué à l'étalonnage des observations radio, au développement d'un outil de catalogage (SPACE), et à la construction d'une base de données des deux types d'émissions plasma joviennes (appelées nKOM et nLF) et de leurs distributions statistiques dans le plan latitude-fréquence. J'ai alors développé depuis zéro un code géométrique 3D (LsPRESSO) capable de modéliser l'occurrence en temps-fréquence d'émissions plasma planétaires, à partir desquelles on peut prédire les distributions statistiques des émissions observées par Juno, en s'appuyant sur les paramètres physiques mesurés de l'environnement jovien. L'étude paramétrique des simulations de LsPRESSO et la classification des observations à partir des mesures locales de leur "mode" de propagation par Juno, m'ont alors permis de répondre à la problématique posée en apportant de nouvelles contraintes sur la génération et localisation des sources des émissions plasma joviennes. Ces résultats offrent de nouvelles perspectives d'études sur la dynamique magnétosphérique et les méthodes utilisées sont applicables aux autres magnétosphères planétaires qui produisent des émissions analogues. Enfin, je présente une courte étude complémentaire consistant en l'analyse visuelle des observations radio de Cassini-RPWS qui m'a permis de localiser les sources des émissions aurorales hectométriques, générées par l'instabilité maser-cyclotron, dans le côté soir de la magnétosphère de Jupiter.In Jupiter's magnetosphere, the well-studied maser-cyclotron instability produces auroral radio radiation at frequencies of a few kHz to 40 MHz in the polar regions, where the plasma is thin and magnetized. Other radio emissions, much less studied, are produced in the denser equatorial regions, at frequencies of less than a few hundred kHz. Mechanisms involving the conversion of electrostatic waves have been proposed to generate these so-called “plasma” emissions, but no consensus has been established. This thesis focuses on the study of Jovian plasma emissions. Its aim is to identify the emission mechanisms, the physical conditions under which they operate, and to deduce the location of the sources. To this end, I have exploited the unique spatial coverage of observations from the radio, plasma and magnetic field instruments of the Juno probe, which has been in polar orbit around Jupiter since 2016, with periastrons at very low altitudes above the poles (<10000 km). I contributed to the calibration of radio observations, the development of a cataloguing tool (SPACE), and the construction of a database of the two types of Jovian plasma emissions (called nKOM and nLF) and their statistical distributions in the latitude-frequency plane.I then developed from scratch a 3D geometric code (LsPRESSO) capable of modeling the time-frequency occurrence of planetary plasma emissions, from which we can predict the statistical distributions of emissions observed by Juno, based on measured physical parameters of the Jovian environment. The parametric study of LsPRESSO simulations and the classification of observations based on local measurements of their propagation “mode” by Juno, enabled me to address the problem posed by providing new constraints on the generation and localization of sources of Jovian plasma emissions. These results opened up new perspectives on magnetospheric dynamics, and the methods used are applicable to other planetary magnetospheres producing similar emissions. Finally, I present a brief complementary study consisting in the visual analysis of Cassini-RPWS radio observations, which enabled me to locate the sources of hectometric auroral emissions, generated by the maser-cyclotron instability, in the evening side of Jupiter's magnetosphere
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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