1,720,985 research outputs found
Poteri locali e amministrazione periferica dello Stato
No full textIl contributo esamina l'evoluzione e l'articolazione del sistema di amministrazione periferica statale e i suoi rapporti con le autonomie territorial
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
Processo di valorizzazione dei sottoprodotti dell’industria enologica tramite recupero di sostanze antiossidanti: studi preliminari su un sistema modello
No full textAppropriate 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
Recovery of phenols from grape skin: preliminary studies on model system
No full textAgro-industrial by-products are the main sources of special wastes. In the Mediterranean area these wastes are mainly related to cereals, grapes and olives transformations; in fact, in 2004, the Italian production was 22,1 millions Tons, 8 millions Tons and 4,7 million Tons, respectively. In particular, the Italian wine industry shows a large production of vinasse (1 millions Tons) that is today used to produce bioethanol. However these wastes still contain over than 30000 Tons of polyphenols, characteristic phenolic compounds of vegetables, which could be recovered as high added value chemicals. Biophenols are known for their bioactivities and antioxidant properties useful in several fields such as cosmetics, cosmetoceutic, nutraceutic and food industry. A new approach of Integrated process of waste Valorisation, including the recovery of the phenolic fraction, would lead to a more sustainable process from the environmental and the economical point of view.
Preliminary process of a selective recovery of biophenols from grape skin using an adsorption/desorption patented technology was performed on a model system of oenocyanin, a natural extract of red grape skins mainly constituted of phenols, solubilised in water up to a concentration close to its solubility (co-pigmentation) limit (54 g/l), in order to simulate an aquose extract of vinasse or a liquid residue from wine/ethanol production. This technology was already gotten in ready for the recovery of biophenols from olive oil milling waste water during an European Project FAIR CT 97 3039 “Natural antioxidants from olive milling process”. The technology, hereby described, was proved to be effective, scalable, relatively cheap and flexible.
The adsorption step was performed with anionic exchange resins and the consequent recovery of the total phenols and anthocyanosides from the model system was >90%. The desorption step was instead performed in solutions containing different percentage of water in ethanol, all added with 1% of concentrated HCl. With all the extracting solution tested the desorption yield were good, 40-50% for anthocyanosides, 70-85% for phenols. Using acidic ethanol:water 40:60 as extraction solvent we obtained the higher overall yield > 80%. The extraction solvent can be then used in order to enrich the phenolic mix in antocyanosydes.
These preliminary results demonstrate that the extraction technology based on polymeric resins could be a feasible tool in order to build up an integrated valorisation process environmentally and economically sustainable
Processi tecnologici per la valorizzazione integrata degli scarti dell’industria olearia
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