1,720,962 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
Dune morphodynamics in shallow waters and sediment transport : the Creïzic bank
No full textLes dunes et bancs sous-marins sont des corps sédimentaires omniprésents, notamment en plateforme interne. Comprendre leur morphodynamique, et les transferts sédimentaires associés, est donc crucial pour appréhender la dynamique sédimentaire en zone côtière. Néanmoins, mesurer les transferts sédimentaires relève encore du défi scientifique, du fait de la grande variabilité spatiale et temporelle du transport pour des forçages hydrodynamiques instationnaires. Cette thèse s’appuie sur un jeu de mesures in situ(bathymétrie, hydrodynamique, acoustique active et passive), pour étudier le comportement d’un banc et des dunes surimposées, le banc du Creïzic. Localisé dans une zone peu profonde du golfe du Morbihan, il comprend dans sa partie centrale des grandes dunes dynamiques, et est composé de sable coquiller très grossier. Le seul forçage est le courant de marée, intense, instationnaire et variable. L’étude morphodynamique pluriannuelle souligne la présence permanente d’une structure longitudinale parallèle au banc. Les dunes orthogonales au banc migrent d’environ 10 m/an dans le sens du jusant. Le volume du banc est constant. L’étude mensuelle montre en outre une recirculation de sédiments à une extrémité du banc, par le mouvement de dunes de faible hauteur, en accord avec la gyre tidale présente sur le banc au flot. Par ailleurs, une méthode exploratoire innovante d’estimation du transport par charriage a été mise en oeuvre,consistant à acquérir des données d’acoustique passive depuis une vedette dérivant sur le banc. Les données inversées montrent une bonne corrélation avec le flux estimé à partir de formulations empiriques (cisaillement) sur les zones de dunes.Sand dunes and submarine banks are ubiquitous,especially on the internal platform. Understandingtheir morphodynamics, and the associated sedimentfluxes (internal and external), is therefore crucial forunderstanding sediment dynamics in coastal areas.However, the measurement of sediment fluxes is stilla scientific challenge, due to the large spatial andtemporal variability of transport, for unsteadyhydrodynamic forcings. For this PhD thesis, a set ofin situ measurements (bathymetry, hydrodynamic,active and passive acoustic) was acquired andanalyzed in order to study the behavior of asubmarine bank and of the superimposed dunes, theCreïzic bank. Located in a shallow area of the Gulf ofMorbihan, it is overlaid in its central part by large anddynamic dunes. It is composed of very coarse shellsediments. The forcing is the tidal current, intense,unsteady and variable.The multi-year morphodynamic study revealed thepermanent occurrence of a longitudinal structureparallel to the bank. Orthogonal sand dunes migrateabout 10 m/year in the direction of the ebb current.The volume of the bank is steady. The monthly studyshows sediment recirculation through low-heightdunes migration over the northern edge of the bank,in line with the tidal gyre that occurs on the bankduring the flow. An innovative exploratory approachwas also implemented to estimate bedload transport.It consist in acquiring passive acoustic data from adrifting boat over the bank with a hydrophone.Inverted data show reliable correlation withestimated fluxes from empirical formulae (shearvelocity) over the dune zones
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
Morphodynamique des dunes en eau peu profonde et transport sédimentaire : le banc du Creïzic (Golfe du Morbihan)
No full textSand dunes and submarine banks are ubiquitous,especially on the internal platform. Understandingtheir morphodynamics, and the associated sedimentfluxes (internal and external), is therefore crucial forunderstanding sediment dynamics in coastal areas.However, the measurement of sediment fluxes is stilla scientific challenge, due to the large spatial andtemporal variability of transport, for unsteadyhydrodynamic forcings. For this PhD thesis, a set ofin situ measurements (bathymetry, hydrodynamic,active and passive acoustic) was acquired andanalyzed in order to study the behavior of asubmarine bank and of the superimposed dunes, theCreïzic bank. Located in a shallow area of the Gulf ofMorbihan, it is overlaid in its central part by large anddynamic dunes. It is composed of very coarse shellsediments. The forcing is the tidal current, intense,unsteady and variable.The multi-year morphodynamic study revealed thepermanent occurrence of a longitudinal structureparallel to the bank. Orthogonal sand dunes migrateabout 10 m/year in the direction of the ebb current.The volume of the bank is steady. The monthly studyshows sediment recirculation through low-heightdunes migration over the northern edge of the bank,in line with the tidal gyre that occurs on the bankduring the flow. An innovative exploratory approachwas also implemented to estimate bedload transport.It consist in acquiring passive acoustic data from adrifting boat over the bank with a hydrophone.Inverted data show reliable correlation withestimated fluxes from empirical formulae (shearvelocity) over the dune zones.Les dunes et bancs sous-marins sont des corps sédimentaires omniprésents, notamment en plateforme interne. Comprendre leur morphodynamique, et les transferts sédimentaires associés, est donc crucial pour appréhender la dynamique sédimentaire en zone côtière. Néanmoins, mesurer les transferts sédimentaires relève encore du défi scientifique, du fait de la grande variabilité spatiale et temporelle du transport pour des forçages hydrodynamiques instationnaires. Cette thèse s’appuie sur un jeu de mesures in situ(bathymétrie, hydrodynamique, acoustique active et passive), pour étudier le comportement d’un banc et des dunes surimposées, le banc du Creïzic. Localisé dans une zone peu profonde du golfe du Morbihan, il comprend dans sa partie centrale des grandes dunes dynamiques, et est composé de sable coquiller très grossier. Le seul forçage est le courant de marée, intense, instationnaire et variable. L’étude morphodynamique pluriannuelle souligne la présence permanente d’une structure longitudinale parallèle au banc. Les dunes orthogonales au banc migrent d’environ 10 m/an dans le sens du jusant. Le volume du banc est constant. L’étude mensuelle montre en outre une recirculation de sédiments à une extrémité du banc, par le mouvement de dunes de faible hauteur, en accord avec la gyre tidale présente sur le banc au flot. Par ailleurs, une méthode exploratoire innovante d’estimation du transport par charriage a été mise en oeuvre,consistant à acquérir des données d’acoustique passive depuis une vedette dérivant sur le banc. Les données inversées montrent une bonne corrélation avec le flux estimé à partir de formulations empiriques (cisaillement) sur les zones de dunes
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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