1,721,047 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
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
Feeding habits of the Blackbelly rockfish, Helicolenus dactylopterus (Osteichthyes, Scorpaeniformes) in the Sardinian Channel.
No full textPrediction of carotid intima–media thickness in obese patients with low prevalence of comorbidities by serum copper bioavailability
No full textBackground and Aim: Western societies, with growing prevalence, suffer from various
metabolic diseases like obesity and hepatic steatosis, better defined as non-alcoholic fatty
liver disease, or cardiovascular (CV) diseases that are strictly linked to each other. The association of their occurrence with the altered homeostasis of metals is an intriguing issue.
Copper in particular was identified as key player in various metabolic derangements. On
these bases, we aimed at investigating the possible association of serum copper levels with
an indicator of early CV risk as the intima–media thickness (IMT) of carotid artery and its
predictive value in a selected population of obese patients.
Methods: We performed a cross-sectional study recruiting 100 obese patients characterized by a low prevalence of comorbidities. Ultrasound investigation for hepatic steatosis
and IMT evaluation were performed. Serum samples were collected and then analyzed
through atomic absorption spectrometry to evaluate their copper content. Possible
correlations between copper bioavailability and biochemical, clinical, and anthropometric
characteristics of patients were sought.
Results: Age negatively predicted copper serum levels of patients (P = 0.009). However,
the most interesting finding is the negative prediction of IMT by the copper serum levels
(t = !2.23, P = 0.028, least absolute deviations regression). Factor analysis confirmed
the aforementioned inverse correlation and highlighted the strong inverse correlation
between smoking and copper serum levels.
Conclusion: Our data show that an altered copper bioavailability predicts early atherosclerosis as main CV risk in obese patients with hepatic steatosis detected by ultrasound, shedding some light in this pathological scenario
A Service Network Design Problem for Freight Transportation in Port Cities
No full textThis paper investigates a service network design problem, which is motivated by the case of freight transportation in a port city. We describe the novel features of this problem, which are based on the possible (but still unexploited) knowledge on the composition of the disaggregated loads in containers and semitrailers entering the port. In this problem, the transportation requests of these loads are highly customized and have different delivery costs. We must determine the paths of vehicles and loads, which result in costs paid by carriers and customers, as well as external costs for the city itself. The resulting network design problem is faced from the holistic viewpoint of a possible mobility manager, which must minimize the overall system costs. We present a mixed integer linear programming model (MILP) for this problem. Since it is very difficult to solve by standard MILP solvers, we present a Tabu Search algorithm exploiting the specific problem features. The computational experiments show to what extent this problem can be tackled by a general purpose mixed-integer programming solver and the Tabu Search algorithm
Considerations on recent findings of Fistularia commersonii Rüppell, 1838 off Sardinian coasts (Central-western Mediterranean)
No full textFifteen specimens of Fistularia commersonii (Syngnathiformes: Fistulariidae) were captured off Sardinian coasts from September 2007 to January 2008. Although reproductive data cannot confirm this species as a resident in these waters, the results presented indicate a sudden and significant diffusion of this Lessepsian migrant also in the western part of the Mediterranean Sea
On the morphometric relationship between beaks and body size in Histioteuthis bonnellii (Férussac, 1835)
No full textSix measurements of 109 beaks (59 males and 50 females) of Histioteuthis bonnellii
(Cephalopoda: Histioteuthidae) caught in the south Sardinian waters were interrelated with the size
(ML) of the specimens. In both sexes, respectively for upper and lower beaks, the lateral wall and the
hood grew faster than other parts (e.g. the rostrum). The analysis of covariance showed different beaks
in the two sexes (p<0.05
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