1,720,955 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
Depositional history of the Trinity-Tiger Shoals region : a transgressed delta complex of the middle Holocene Mississippi Delta
Get PDFThe Holocene Mississippi River Delta is arguably the world’s most thoroughly researched deltaic system. However, much of this research has occurred predominantly within the present-day subaerial delta, whereas comparatively little research has been attempted downdip within the offshore, more difficult-to-reach parts. This study advances our understanding of the Holocene delta by examining deltaic sediments within the Trinity-Tiger Shoals Complex region, located ~ 30 – 40 km offshore of central Louisiana. Specifically, this study addresses two questions. Which delta complex prograded into this offshore region? Do the overlying transgressive deposits reflect that predicted by the prevailing transgressive depositional systems model? To answer these questions, this study uses an integrated data set consisting of ~ 1,350 km of high-resolution subbottom sonar profiles and various sedimentological data gleaned from 60 vibracores, including 22 AMS radiocarbon dates. Results from this study depict an intricate stacking arrangement of 12 distinct depositional units. Near the base of the stratigraphic framework above antecedent topography are the remnants of a middle Holocene Mississippi Delta complex. Prodelta and delta-front facies along with the partially-preserved southwest trending distributary system that fed these depositional environments are recognized. Furthermore, analysis of the regressive component reveals an offsetting, overlapping, and stacked arrangement of four delta lobes and one subdelta. Five AMS radiocarbon dates (~ 4,820 yr BP to 5,980 yr BP) measured from these regressive sediments confirm a Maringouin Delta Complex origin. A ~ 4,000 yr hiatus ensued following the abandonment of the Maringouin Delta Complex, as indicated by 17 AMS radiocarbon dates measured from the overlying transgressive component. During this hiatus, erosional shoreface retreat produced a prominent ravinement surface along the entire top boundary of the Maringouin Delta. It was not until ~ 1,000 yr BP that significant amounts of sediments began migrating into the study area from the east, which have remained, at least for the time being, mostly preserved. Among these recent post-Maringouin depositional units are a detached down-drift subaqueous delta related to the Lafourche Delta Complex as well as the most-recent sandy deposits of Trinity Shoal and an unnamed shoal. This new understanding of post-Maringouin deposition is considered incompatible with the prevailing transgressive depositional systems model, particularly stage 3 of that model
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
Long-term subsidence and compaction rates: a new model for the Michoud area, south Louisiana
Get PDFThis study examined the stratigraphic record of the Michoud area in East New Orleans, Louisiana to address questions concerning the magnitude of, and processes leading to land-surface subsidence. The hypotheses under review are based on recent geodetic studies, which challenge the widely held position that modern subsidence is primarily a function of shallow sediment compaction. Testing these hypotheses involved constructing a structural cross section of the Michoud area using well logs, chronostratigraphic data, and fault picks, so as to evaluate differential motion along specific faults through time. Employing ages and corrected depths for three key subsurface horizons, long-term (Middle Miocene to Present) time-averaged subsidence rates were calculated: rates range from -0.140 to -0.177 m/kyrs (-0.140 to -0.177 mm/yr). Long-term subsidence rates are incompatible with those derived from geodetic studies: geodetically derived subsidence rates (-14.2 to -23.0 mm/yr) for the Michoud area are two orders of magnitude greater than long-term subsidence rates. Considering the scale of resolution of respective techniques, caution is advised when comparing respective subsidence rates. Nevertheless, the new subsurface, structural model for the Michoud area suggests reactivation of local faults, including any recent movement of the Michoud Fault, is a transient phenomenon that is likely related to rapid Quaternary sediment loading. It is reasonable to compare mean long-term compaction rates, which is a component of total subsidence, derived from this research to geodetically derived compaction rates of pre-Holocene strata. Using a standard decompaction technique, mean long-term compaction rates for strata residing above the Middle Miocene Bigenerina Humblei horizon were calculated: rates range from -0.0704 to -0.0914 m/kyrs (-0.0704 to -0.0914 mm/yr), which are two orders of magnitude less than geodetically derived, pre-Holocene strata compaction rates (-4.6 mm/yr). The findings of this research, particularly the discrepancy between mean long-term compaction rates derived in this study and pre-Holocene compaction rates derived geodetically, raises questions into the interpretations and/or accuracy of the geodetic data for the Michoud area, and therefore, the subsidence rates determined from such data
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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