1,721,053 research outputs found
Micromesistius poutassou (blue whiting) abundance and biomass data in Bay of Biscay estimated from acoustic surveys (2000-2012)
No full textAcoustic and pelagic trawl data were collected during various pelagic surveys carried out by IFREMER in May between 2000 and 2012 (except 2001), on the eastern continental shelf of the Bay of Biscay (Pelgas series). The acoustic data were collected with a Simrad EK60 echosounder operating at 38 kHz (beam angle at -3 dB: 7°, pulse length set to 1.024 ms). The echosounder transducer was mounted on the vessel keel, at 6 m below the sea surface. The sampling design were parallel transects spaced 12 nm apart which were orientated perpendicular to the coast line from 20 m to about 200 m bottom depth. The nominal sailing speed was 10 knots and 3 knots on average during fishing operations. The scrutinising (species identification) of acoustic data was done by first characterising acoustic schools by type and then linking these types with the species composition of specific trawl hauls. The data set contains nautical area backscattering values, biomass and abundance estimates for blue whiting for one nautical mile long transect lines. Further information on the survey design, scrutinising and biomass estimation can be found in Doray et al. 2012
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
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
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
Bay of Biscay sound scattering layers : acoustic characterization, specific composition and spatial distribution
No full textDes données acoustiques sont collectées en continu lors de campagnes écosystémiques pour détecter les bancs de poissons d’espèces commerciales et en quantifier l’abondance. Ces données multifréquences contiennent également des informations sur des agrégations de cibles plus petites qui se présentent sous forme de couches diffusantes. Il existe une grande diversité de couches diffusantes dont l’aspect sur les échogrammes, la réponse fréquentielle et la composition spécifique varient. L'objectif de cette thèse est de définir les types de couches diffusantes rencontrées lors de la campagne PELGAS, de décrire leurs distributions spatiales à méso-échelle, de les comparer à celles des autres compartiments de l'écosystème, et d'examiner la composition taxonomique des couches diffusantes résonantes à fine échelle. Une méthode de classification non supervisée des échos appliquée aux données PELGAS permet de définir des « paysages acoustiques » structurés spatialement. Ces paysages acoustiques sont dominés par des réflecteurs porteurs de bulles de gaz résonnant aux fréquences halieutiques et ne sont corrélés à aucun compartiment de l'écosystème pélagique issus de PELGAS2013. La composition biologique de couches diffusantes denses est étudiée à fine échelle en combinant par des approches directe et inverse les résultats de leur échantillonnage acoustique et biologique. Les résultats montrent que la réponse acoustique des couches diffusantes denses est dominée par celle de bulles de gaz incluses dans des larves de poissons (e.g. Sardina pilchardus}), et dans des organismes micronectoniques, qui sont peu ou pas échantillonnés avec les outils de collecte biologique.Fisheries acoustic data are continuously collected during ecosystemic surveys to detect fish schools of commercial species and to quantify the fish abundance. These multifrequency data also contain information about smaller target aggregations producing ubiquitous Sound Scattering Layers (SSLs) on the echograms, with quite diverse shape, frequency responses and taxonomic compositions. In this work, we focus on the SSLs observed in spring in the Bay of Biscay during the PELGAS surveys. The objectives are: i) to classify SSLs, ii) to describe their spatial meso-scale distribution, iii) to investigate their relationships with other ecosystem components, and iv) to investigate the taxonomic composition of resonant SSLs at fine scale. A Multiple Correspondence Analysis based method for non supervised echoes classification is applied to PELGAS multifrequency data to define constrasted and spatially structured “acoustic landscapes”. Acoustic landscapes are dominated by frequency responses of gas-bearing organisms, whose gas inclusion might resonate at the fisheries acoustic frequencies. No correlation is found between the spatial distributions of acoustic landscapes and those of other pelagic ecosystem components indices. The biological composition of resonant SSLs is investigated by jointly applying forward and inverse approaches to fine scale acoustic and biological data collected in the same dense SSL. Results suggest that the dense SSLs may be comprised of fish larvae (e.g. Sardina pilchardus) and larger micronektonic gas-bearing organims that are so far very poorly sampled by non-acoustic devices
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
