1,721,016 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
Structural and petrophysical characterizations of a geothermal system in a subduction volcanic setting : Guadeloupe archipelago
No full textLa zone de Vieux-Habitants rassemble les indices permettant de supposer la présence d’un système hydrothermal de haute température. Les données géophysiques acquises pour la prospection de ce système ne suffisent pas à sa compréhension qui nécessite l’analyse d’analogues. Pour proposer un modèle de système géothermique de cette zone, une analyse multiscalaire de la déformation fragile et une caractérisation des propriétés pétrophysiques des formations volcaniques ont été ménées sur trois paléo systèmes. L’analyse des populations de fractures montre que leur organisation n’est pas régie par une seule loi mathématique. Les faciès volcano-sédimentaires sont peu déformés ou de manière très localisée contrairement aux laves dont les densités de fracturation sont fortes. L’analyse de la distribution des faciès hydrothermalisés par rapport à ces structures indique qu’à l’échelle kilométrique, certaines intersections de failles contrôlent le drainage des fluides et localisent les zones d’altération hydrothermale prononcée. Les faciès sont divisés en grands groupes en fonction de leur nature et de leur degré d’altération. Ils montrent une grande variabilité des propriétés pétrophysiques. A l’état sain, les laves d’une part et les faciès pyroclastiques et de coulées de débris d’autre part, constituent deux groupes bien distincts. L’altération hydrothermale induit une restructuration totale du squelette matriciel et du réseau poreux. Elle permet une forte atténuation du signal magnétique et le développement d’un groupe ayant des propriétés réservoirs intermédiaires en diminuant les propriétés réservoirs des dépôts volcano-sédimentaires et en améliorant celles des laves. Le modèle de réservoir ainsi disponible conjugue des éléments structuraux et des hétérogénéités lithologiques permettant le transfert rapide des fluides, alors que les propriétés matricielles d’origines primaire et secondaire vont plutôt contrôler les propriétés de stockage de fluide et de chaleur.The Vieux-Habitants area gathers indicators allowing to suppose a high-temperature hydrothermal system. The interpretation of geophysical data acquired for the exploration of this system requires the analysis of analogues. Several hydrothermal paleo-systems were studied in order to propose a conceptual model of a geothermal system for the Vieux-Habitants area. Studies of these analogues are based on a multi-scale study of the brittle deformation and a petrophysical characterization of the different volcanic rocks. The organization of fractures indicates the occurrence of a characteristic scale for each level of observation. Volcano-sedimentary units are far less deformed compared to highly fractured lavas. The brittle deformation in volcano-sedimentary deposits is highly localized in fractured corridors. Some fault intersections control major fluid flow at the kilometer scale. Moreover, the most hydrothermalized rocks are localized in the vicinity of these intersections. Volcanic rocks are divided according to their mechanism of formation (lava, debris flow…) and their degree of alteration. They exhibit strong heterogeneities of petrophysical properties. Fresh rocks are separated in two distinct groups, on one side lavas and on the other side debris flows and pyroclastic deposits. Hydrothermal alteration produces mineralogical replacements involving a complete reorganization of both the matrix skeleton and the pore network. It is marked by a removal of magnetic signal, an increase of porosity and permeability in lavas and a decrease of these properties in debris flows and pyroclastic deposits. Therefore, hydrothermalized rocks form a group with intermediate reservoir properties between the two groups of fresh rocks. The reservoir model combines both structural components and lithological heterogeneities that allow an efficient fluid transfer, whereas the matrix properties of primary and secondary origins will rather control the fluid and heat storage properties
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
Basement reservoirs in extensive setting : Genesis, geometries and fluid circulations : Examples of the intracontinental Albert Lake rift (Uganda) and the Ifni proximal margin (Morocco)
No full textCette étude vise à caractériser selon une approche multi-échelles et multi-techniques les propriétés structurales et pétrophysiques de deux analogues de surface de réservoirs de socle développés en contexte extensif. Cette démarche permet de proposer un modèle conceptuel de réservoir de socle à hydrocarbures pour chacun de ces systèmes étudiés. Ces modèles contribuent à améliorer la compréhension de ces systèmes pétroliers, depuis la zone de maturation jusqu’aux zones de stockage dans le socle. Cette étude représente une base pour les guides de prospection de ces réservoirs à hydrocarbures. Ce travail met en avant la distribution multi-échelles sur plus de dix ordres de grandeur de l’ensemble des éléments qui composent le réservoir, depuis l’échelle pluri- kilométrique des structures tectoniques majeures jusqu’à l’échelle infra-millimétrique de la microporosité secondaire des zones fracturées et altérées. L’étude de ces analogues met en évidence la nécessité pour ces réservoirs d’être affectés par plusieurs familles directionnelles de failles et fractures, fortement connectées. Les zones de failles majeures compartimentent le réservoir en délimitant un ensemble de blocs structuraux. Leurs intersections représentent des zones de drainage entre et au sein même de ces blocs structuraux. Les zones favorables de stockage correspondent aux zones endommagées des zones de failles, ainsi qu’aux niveaux altérés au toit du socle, développés par altération supergène lors de phases d’exhumation anté-rift. Les caractéristiques des réservoirs de socle résultent finalement de la longue évolution géodynamique de ce type de formations jusqu’à la phase de rifting et d’enfouissement du réservoirThis work aims to characterize with a multi-scale and multi-method approach the effects of both brittle deformation and weathering processes on the structural and petrophysical properties of two surface analogue case studies developed in extensive setting. This approach allows us to build a conceptual hydrocarbon basement reservoir model for both studied systems. These geological models enhance the understanding of those non-conventional petroleum systems from the maturation zone to storage in the basement. Moreover, this study can also provide information for exploration guides for those hydrocarbon reservoirs. This study points out the multi-scale distribution of all the features constituting the reservoir, over ten orders of magnitude from the pluri-kilometric scale of the major tectonics structures to the infra-millimetric scale of the secondary micro-porosity of fractured and weathered basements units. Major fault zones allow the “compartmentalization” of the reservoir by dividing it into several structural blocks. The analysis of these fault zones highlights the necessity for the basement reservoirs to be characterized by a highly connected fault and fracture system, where structure intersections represent the main fluid drainage areas between and within the reservoir’s structural blocks. The suitable fluid storage areas in these reservoirs correspond to the damage zone of the fault structures developed during the tectonic evolution of the basement and the weathered units of the basement roof developed during pre-rift exhumation phases. This study highlights therefore that basement reservoir properties are the result of the long geodynamic evolution of these rock
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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