1,720,995 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
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
Evaluation of the potential interaction between microplastic distribution and biodiversity richness along the coast of the Western Ionian Sea
No full textThe presence of microplastic particles (MPs) in the Mediterranean Sea has been widely reported, but their ecological risk in the marine ecosystem have not been completely addressed. With this purpose, the MPs distribution in the coastline waters of the Western Ionian Sea were investigated for the first time. Considered a hot spot of biodiversity and important resting and nesting sites for birds, this area is heavily interested by anthropogenic pressure. Simultaneous visual census of several marine species and manta trawl sampling were performed during a cruise carried out in 2017, to provide an assessment of biodiversity richness and MPs presence. Species richness, Shannon index, and evenness were computed to determine the biodiversity of the studied area. MPs collected were isolated and characterized by shape, size, color, and chemical composition. All data from field surveys were analyzed in Quantum GIS platform. Kernel density estimation was overlapped with marine litter densities to obtain a preliminary risk assessment. In total, 380 sightings were recorded for a total of 17 species: five species of Odontocetes and twelve species belonged to different taxa such as birds and marine turtles. The highest values of biodiversity in terms of species richness and Shannon index were observed in the Gulf of Noto and the Gulf of Augusta, located in the southern part of the studied area. Taking into account the MPs distribution, the highest concentrations of MPs were found in the waters facing Syracuse and the Gulf of Augusta, with an average abundance of 0.10 ± 0.06 items/m2. The overlap between the hotspots of biodiversity and MPs occurrence represents a preliminary contribution to the risk assessment of marine organisms’ exposure to microplastics and may contribute to the identification of sensitive areas where mitigation actions to tackling the plastic pollution are needed
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
Preliminary evaluation of microplastic ingestion and phthalates load in Mediterranean Lanternfish (Myctophum punctatum)
No full textMyctophids plays a key role in trophic webs from the continental slope and pelagic waters
linking the zooplankton to top predators, such as cetaceans. They feed mainly on copepods,
euphausiids, amphipods, and decapods during upward nightly migration into the epipelagic
zone where floating plastic debris is described to accumulate. As a consequence of their
vertical migration, these fish may reflect the ingestion of microplastics (MPs) along the water
column and be exposed to load of hazardous chemicals such as Phthalates esters (PAEs)
leached from these particles. Within the Plastic Busters MPAs project, 20 specimens of
Myctophum punctatum have been collected using a plankton net during a sampling campaign
carried out in the North-Western Mediterranean Sea during summer 2018. Fish were properly
processed to evaluate the potential relationship between the ingestion of MPs and the levels
of chemicals released from the ingested particles. The gastrointestinal tract of each organism
was chemically digested using KOH and filtered through a glass-fiber membrane. Levels
of four different PAEs (DIBP, DBP, DEHP and BBzP) were evaluated in the fish muscle,
as plastic tracers. MPs isolated were characterized by size, shape, colour, and chemical
composition by FTIR spectroscopy. The presence of MPs confirms the hazard associated
with the debris ingestion for this species and its transfer throughout the marine trophic web.
The chemical analysis revealed for the first time the levels of PAEs in the muscle tissue of
Mediterranean lanternfish, confirming their bioavailability for these organisms. Being these
toxic chemicals used as plasticizers, their presence could be due to the leaching of these
compounds from floating plastics debris ingested during the feeding activity. The results
provide data on an ecologically valuable and poorly investigated species, emphasizing the
challenges between the plastic debris accumulation and the associated risks to wildlife
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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