1,720,979 research outputs found
On a female of Tremoctopus sp. (Octopoda: Tremoctopodidae) caught in the Sardinian Sea
No full textMorphometric and biologic data on a maturing female of Tremoctopus sp. (Octopoda:
Tremoctopodidae) from the Sardinian Sea are provided. Potential fecundity and oocytes size values,
reported for the first time in the western Mediterranean Sea, have suggested a possible different
reproductive investment between the two basins of the Mediterranea
On a female of Tremoctopus sp. (Octopoda: Tremoctopodidae) caught in the Sardinian Sea = Su una femmina di Tremoctopus sp. (Octopoda: Tremoctopodidae) catturata nel mare di Sardegna
No full textMorphometric and biologic data on a maturing female of Tremoctopus sp. (Octopoda: Tremoctopodidae) from the Sardinian Sea are provided. Potential fecundity and oocytes size values, reported for the first time in the western Mediterranean Sea, have suggested a possible different reproductive investment between the two basins of the Mediterranean
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
Life history parameters of the small Mediterranean-endemic skate, Raja polystigma Regan 1923, from Sardinian seas
No full textThe life history parameters of the speckled skate, Raja polystigma were investigated through the vertebral centra analysis. A total of 183 specimens (97 females, ranging from 11.5 to 59 cm in TL and 87 males with TL among 11.8 and 52.1 cm) were caught during experimental (MED.I.T.S.) and commercial trawl surveys in the period 2012-2013. The vertebrae centra extracted from a subsample of at least 10 individuals, belonging to different size classes, were employed to state which technique among the EDTA decalcification process, the analysis of unstained centra and two staining methods (Alizarin Red and Silver Nitrate), allowed a better band enhancement. The unstained centra and those treated with Alizarin red provided a better band visibility, so these techniques were applied to the entire sample. The annuli counts were carried out by two different readers and repeated two times for both treatments. The obtained readings showed a good reproducibility with both techniques, even though band counts executed on stained centra (PA = 86.8, %Cv = 7.0, IAPE = 5.177) seemed slightly more accurate than those made on unstained samples (PA = 86.6, %Cv = 7.9, IAPE = 5.96). These differences were stastically proved through the Kolmogorov-Smirnov test (p < 0.005). The von Bertalanffy Growth Functions were determined for both stained and unstained samples (respectively Linf = 75.93, s.e. = 7.29; k = 0.10, s.e. = 0.02; t0 = -2.29, s.e. = 0.25; Linf = 74.97, s.e. = 7.35; k = 0.10, s.e. = 0.02; t0 = -2.16, s.e. = 0.24). Given these results is recommended to apply the Alizarin red staining methods for future age estimations, through vertebral centra, of the speckled skate, before trying other more expensive and less time-efficient techniques
Reproductive biology of the blackmouth catshark Galeus melastomus Rafinesque, 1810, in Sardinian seas (central-western Mediterranean)
No full textA total of 1207 specimens (717 females and 490 males) of the Blackmouth catshark Galeus melastomus (Chondrichthyes: Carcharhiniformes) were collected in Sardinian waters at depths from 120 and 1600 m. A detailed macroscopic and histological description of the maturity stages was reported fir both sexes. Mature individuals were found during the entire year suggesting continuous mating and spawning. Females matured at higher size than males and both sexes showed a late maturity (females L50=45 cm TL; males L50=42.4 cm TL)
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