1,721,004 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
Damages induced by an over-the-row harvester in ten cultivars in a high-density olive orchard
No full textThe damages induced by an over-the-row harvester were studied in 10 olive cultivars in a high-density orchard (1,250 trees ha-1) planted in 2011 in Central Italy. ‘Maurino’, ‘Sargano di Fermo’, ‘Ascolana tenera’, ‘Rosciola’, ‘Piantone di Mogliano’, ‘Piantone di Falerone’, ‘Arbequina’, ‘Tosca®’, ‘Don Carlo®’ and ‘FS17®’ were harvested by a tow-behind machine in 3 consecutive years (2015, 2016 and 2017). Trees were pruned with an initial conical shape since planting, removing long branches perpendicularly to the row to create a continuous hedgerow system finally. The canopy height ranged from 2.88±0.32 m to 3.3±0.20 m, and the transversal diameter (perpendicular to the row) from 1.78±0.24 m to 2.4±0.20 m in 2016 and 2018, respectively. The damages (hurts and breakings) were monitored in 20 homogeneous trees per cultivar at the end of the harvest. ‘Maurino’ and ‘Arbequina’ were averagely less damaged than the other studied cultivars, whereas ‘FS17®’ showed more hurt and breakings. The growth of the canopy during the three years increased the susceptibility to limb breakage of most part of the cultivars. Results are discussed to identify most and least damaged cultivars and to detect architectural predictors to classify them according to their susceptibility to damage. This study supplies useful information on the adaptability of local, national, and international olive cultivars to high density plantations and their suitability and specific needs for over-the-row mechanical harvest
Purification of vitellogenin from liver and serum of Silurus glanis collected in Campotto valleys (Italy). Preliminary report.
No full textA simple and rapid technique for vitellogenin separation and quantification, and its application to Silurus glanis are described. The method seems to be effective in vitellogenin quantification and could be applied to all species for whom a vitellogenin standard is at present not available. Obtained data in Silurus seems to indicate a slight alteration of endocrine milieu of the fish, confirming previous results in carps
"Thermo-mechanical design of the core of PEC Fast Reactor" (in Italian) - CNEN-DRV Report VT.CC.00065, Bologna (I), Apr. 1978
No full textThe document (in Italian) deals with thermomechanical design of the core of a fast breeder reactor. The reactor is PEC (Prova Elementi di Combustible) in construction at the Brasimone center in Italy (close to Bologna). The topic is the mechanical deformation of fuel bundle caused by differential swelling. Irradiation is different in different parts of the core causing heterogeneous swelling. This induces loads on fuel elements and on the entire core. Design should be such to accommodate for those loads. The design of core constraints constitute the content of the document
Preliminary work on vitellogenin purification from serum of Caretta caretta collected at the WWF Seaturtle Rescue Center of Lampedusa, Sicily (Italy).
No full textThe presence of vitellogenin in male is a useful marker of endocrine disruption in oviparous vertebrates such as seaturtles and its quantification helps to evaluate the habitats’ quality.
Considering the lack of commercial systems for vitellogenin analysis and the lack of specific standards for seaturtles we focused the work on the definition of a reliable method for vitellogenin purification and quantification in Caretta caretta.
Heparinized blood (2 cc) samples were collected, after morphological measurement, from individuals of Caretta caretta hospitalized at the WWF Seaturtle Rescue Center Lampedusa, Sicily (Italy) and obtained plasma was stored frozen at –20°C till analysis.
For VTG purification 100 ml of each serum’s samples was used. The VTG purification was obtained by precipitation while its quantification was performed by spectrophotometric method, using standard staining and protocol (“DC protein assay”, BIORAD).
VTG levels are in agreement with subjects gender. The marker was detected in all animals, even if in male turtles the levels were very low.
Overall, there seems to be no risk for reproductive health of seaturtles from Sicily
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