1,720,957 research outputs found
Situation de la pisciculture en Italie
No full textAu cours des deux années 1988-1989, une étude sur l'état de l'aquaculture italienne a été effectuée pour établir quelles sont les principales orientations, les capacités de production et les problématiques qui s'y rapportent. Les informations utiles ont été obtenues auprès des Collectivités locales, des Chambres de Commerce, des Associations professionnelles, des commerçants en gros. Des visites ont également été faites sur place auprès des éleveurs. 1 005 élevages ont été recensés sur le territoire italien: 560 pour la truite, 193 pour le poisson chat, 135 pour l'anguille 50 pour les espèces ichtyiques euryhalines (sea bass and sea bream), 30 pour la carpe, 20 pour le carassin dorè et 15 élevages d'autres espèces d'eau douce. Les élevages de truite et d'anguille sont essentiellement concentrés dans les régions situées au nord, notamment la Vénétie et la Lombardie. L'Emilie-Romagne est de loin en téte dans l'élevage du poisson-chat et du carassin dorè avec respectivement 163 et 15 élevages. La répartition de la production par région reflète en grande partie celle des élevages. La quantité produite chaque année s'élève a 30 000 tonnes de salmonidés, 2 500 tonnes d'anguilles, 2 300 tonnes de poissons-chats, 650 tonnes d'espèces euryhalines et 190 tonnes de carassins dorés. Les informations acquises montrent aussi l'importance considérable que revêtent actuellement les espèces de repeuplement (Salmonidés et Cyprinidés)
Characterization of a quatyernary liquid system improving the biovailability of poorly water soluble drugs
No full textThe aim of this work is the characterization of the quaternary system composed of water, triacetin (oil), ethanol (alcohol), and Tween 80
(surfactant), as its results enable the enhancement of the bioavailability of nimesulide, a poorly water soluble nonsteroidal antiinflammatory
drug widely employed in the pharmaceutical field. Particular attention is devoted to the surfactant-free ternary system, as it proved able to
solubilize nimesulide as well, and the absence of a surfactant is desirable in order to keep the preparation as tolerable as possible. Both
bulk and interfacial properties of this system are investigated, and a mathematical model to calculate the interface composition of a threecomponent
two-phase system is developed. This model is based on Gibbs’ theory on interfaces, which considers an arbitrary mathematical
dividing surface so that the two phases continue uniformly up to it, although interface regions have no sharply defined boundaries. We find
that both the quaternary and the ternary systems investigated show a miscibility lacuna and that, in the surfactant-free ternary system, an
increase of the ethanol weight fraction is reflected as an impoverishment of the ethanol interfacial molar fraction.
2003 Elsevier Inc. All rights reserved
Characterization of a quaternary liquid system improving the bioavailability of poorly water soluble drugs
No full textThe aim of this work is the characterization of the quaternary system composed of water, triacetin (oil), ethanol (alcohol), and Tween 80
(surfactant), as its results enable the enhancement of the bioavailability of nimesulide, a poorly water soluble nonsteroidal antiinflammatory
drug widely employed in the pharmaceutical field. Particular attention is devoted to the surfactant-free ternary system, as it proved able to
solubilize nimesulide as well, and the absence of a surfactant is desirable in order to keep the preparation as tolerable as possible. Both
bulk and interfacial properties of this system are investigated, and a mathematical model to calculate the interface composition of a threecomponent
two-phase system is developed. This model is based on Gibbs’ theory on interfaces, which considers an arbitrary mathematical
dividing surface so that the two phases continue uniformly up to it, although interface regions have no sharply defined boundaries. We find
that both the quaternary and the ternary systems investigated show a miscibility lacuna and that, in the surfactant-free ternary system, an
increase of the ethanol weight fraction is reflected as an impoverishment of the ethanol interfacial molar fraction
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
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