1,720,961 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
Results of selective removal of the black bullhead (Ameiurus melas) in two different lentic system
Get PDFIn the sake of better understanding of the mechanisms that drive interactions between
invasive species and their ecosystems, results of selective removal of the black bullhead
(Ameiurus melas) in two different lentic systems were compared. Ponjavica Nature Park has
characteristical watercourse of the plains with very slow flow and the coastal remains of
wetlands. Markovačko reservoir was built for the needs of the irrigation system of the
nearby agricultural land. Both systems suffer dominance of the black bullhead,
characterized as a species of "globally high risk". Combining results of the mass removal,
the effects on the native fish populations have been empirically demonstrated and
quantified. Black bullhead selective removal in Ponjavica lasted from August - October
2018, April - September 2019, with 20,145 black bullhead individuals removed. It showed
decreased abundance of bleak (Alburnus alburnus) 2.3 times, while the abundances of
roach (Rutilus rutilus) and European perch (Perca fluviatilis) remained almost unchanged. A
significant increase in abundance was recorded in rudd (Scardinius erythrophthalmus) (5.3
times). The abundances of topmouth gudgeon (Pseudorasbora parva), pumpkinseed
(Lepomis gibbosus), and Prussian carp (Carassius gibelio) increased 25.5, 4.9, and 4.2 times,
respectively. The mass removal of black bullhead on Markovačko Lake lasted from August -
October 2020, April - September 2021, and 15,921 black bullhead specimens were
removed. When the post removal state from Markovačko lake was determined, two species
appeared in the sample for the first time: European perch and chub (Squalius cephalus). The
abundance of bleak increased 3 times, abundance of Prussian carp reduced 8 and black
bullhead 16 times. The abundance of roach decreased 11, rudd 10, pike-perch (Sander
lucioperca) 4 and freshwater bream (Abramis brama) 2 times. The abundances of
pumpkinseed increased 10, Monkey goby (Neogobius fluviatilis) 3 and topmouth gudgeon
2.5 times. The results showed that the fyke nets can be most effectively and selectively
applied to control the abundance of black bullhead, because simplicity and nonharmfulness
to other species. It is not possible to completely remove this species from the
ecosystem, but reduce the negative impact by suppression (removal programs) and
containment of existing state is crucial
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
Intestinal content analyses of pumpkinseed Lepomis gibbosus (Linnaeus, 1785) in five small reservoirs – central Serbia.
No full textLepomis gibbosus (pumpkinseed) was first recorded as a non-native fish in Serbia in the
1930s in the Tisza River. The species currently inhabits almost the entire region of the Black
Sea basin in Serbia, but has no economic value. The current range of the pumpkinseed
covers more than 50% of the total Serbian area and is also naturalised in Serbian waters.
The pumpkinseed feeds on bottom fauna, small fish, fish roe and juvenile fish, which
together with competition for habitat and spawning sites can have a negative impact on
native species. The most common prey of younger specimens is zooplankton, while adult
specimens feed on larger organisms such as larvae and pupae of insects, molluscs or
crustaceans. The composition of the prey varies seasonally and depends on the
composition of the community. The main objective of the study was to analyse the
differences in the feeding habits of pumpkinseed in five reservoirs.
Samples were collected from five reservoirs in central Serbia (<200 asl, Markovačko,
Topola, Vlaški Do, Jatagan, Kudreč) using standard electrofishing equipment. All sampled
reservoirs had mud substrate, except Jatagan Reservoir, which had gravel substrate. The
sampled fish were identified on site based on morphological characteristics using
identification keys. The sampled fish were measured using total body length and weight.
The total sample consisted of 354 pumpkinseed individuals whose body weight ranged
from 3.66–9.52 g and body length from 6.01–8.41 cm. The number of individuals with
intestinal content was 282, while the number of individuals with empty stomachs was 72.
The following macroinvertebrate taxa were identified during the examination of the gut
contents: aquatic insects (Chironomidae, Chironomidae-pupae, Diptera, Ceratopogonidae,
Trichoptera, Ephemeroptera, Odonata, Heteroptera, Coleoptera), Gammaridae, Mollusca,
Bivalvia, Gastropoda, Nematoda. Undetermined terrestrial insects were also recorded. Most
prey were found in the Kudreč Reservoir, and the greatest diversity was in the Topola
Reservoir. Jatagan Reservoir had the lowest number of prey items, which may be due to
the substrate type. The high number of aquatic insect taxa could be explained by the small
surface area of the reservoir and the presence of aquatic vegetation.Book of Abstracts: Joint ESENIAS and DIAS Scientific Conference and 12th ESENIAS Workshop: Globalisation and invasive alien species in the Black Sea and Mediterranean regions – management challenges and regional cooperation; 2023 Oct 11-14; Varna, Bulgaria. Sofia: Institute of Biodiversity and Ecosystem Research, Bulgarian Academy of Sciences (IBER-BAS); 2023. p. 91
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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