1,720,954 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
Carbonates microporeux : influence de l'architecture du milieu poreux et de la mouillabilité sur les écoulements diphasiques dans les réservoirs pétroliers
No full textAu Moyen-Orient se concentrent, aujourd'hui, 60% des réserves connues en hydrocarbures. Deux tiers de ces dernières sont localisées dans des lithologies carbonatées à composante mircoporeuse d'âge Crétacé. Cette étude a pour but d'améliorer la compréhension du comportement de fluides polyphasés (eau, huile, gaz) dans de tels systèmes. Deux principaux facteurs définissent généralement les qualités d'un milieu poreux face à ses propriétés de roche réservoir: sa morphologie (la topologie du milieux poreux) et les conditions physicochimiques de surface (la mouillabilité, liée aux fluides présents). Afin d'identifier l'influence respective de chacun de ces deux paramètres une approche expérimentale et dynamique a été utilisée et comparée à une étude basée sur la reconstitution du réseau mircoporeux par mictrotomographie synchrotron. Du point de vue industriel, des artéfacts générés soit par la technique d'acquisition, soit par l'influence des conditions de forage, soit par les procédures censées restaurer l'état originel des roches avant imbibition par les hydrocarbures ont été mis en évidence. Ces artefacts pourraient avoir une incidence sur l'évaluation des réserves
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
Micritic limestones of the Middle East: influence of wettability, pore network and experimental technique on drainage capillary pressure curve
No full textPrimary drainage capillary pressure curves are often used to assess the distribution of initial water saturation versus elevation above the FWL in oil reservoirs. This paper focuses on 1) the comparison between oil/water centrifuge tests and mercury injection 2) the effect of wettability alterations due to drilling fluids and laboratory procedures on the oil/water drainage Pc curve 3) relationship between wettability and pore structure. Outcrop low permeability microporous limestones, representative of three different sedimentary facies of the Shuaiba formation in the Middle East have been used for this study. Companion samples were used to assess the influence of the different treatments. Porosity, permeability, X-ray tomography, probe permeametry, and NMR T2 curves were used to ensure that companion samples were very similar. For each facies, the following first drainage capillary pressure curves were compared: • Oil/water at strongly water-wet conditions with refined oil • Oil/water with reservoir oils • Oil/water with reservoir oil after aging with reservoir oil and cleaning • Oil/water with refined oil after flush with oil base mud filtrate and cleaning • Mercury injection For each treatment, wettability tests were also performed to measure the prevailing wettability during the drainage process. The main results are: • Large discrepancies are observed between water/oil and mercury injection Pc curves, particularly in microporous facies. Discrepancies are very significant over the full saturation range. Suggestions based on the very low pore sizes of these microporous rocks are proposed to scale these results to reservoir conditions. • Severe oil-base mud invasion may result in dramatic overestimates of the initial water saturation from first drainage Pc, even after core cleaning. • “Irreducible” water saturation is a poor criterion for rock-typing in carbonates. • Wettability variations within a carbonate reservoir might also be attributed to the topological differences between facies. • The efficiency of cleaning processes in carbonates is dependent on the interplay between the macroporosity and the microporosity, for the same reservoir oil and for the same suite of solvents
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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