1,720,997 research outputs found
Completamento delle conoscenze naturalistiche di base: sviluppi delle conoscenze sulle “emergenze” della flora vascolare italiana.
No full textTherophytic vegetation on carbonate soils of central Tyrrhenian Italy: synecology and syntaxonomy
No full textSulla presenza di Spirodela polyrrhyza (L.) Schleid. ed Eichhornia crassipes (Mart.) Solms nelle acque interne dell’Agro Pontino (Lazio).
No full textSpirodela polurrhiza (L.) Schleid. and Eichhornia crassipes (Mart.) Solms in Agro Pontino fresh waters Lazio).
The Authors report on the discovery in some stations of Agro Pontino area (South-West of Lazio) of two intersting aquatic plants, Spirodela polyrrhiza and Eichhornia crassipes, whose distribution in this area wasn't well known till now. Both of them are including in the floristic composition of Lemno-Spirodeletum polyrhizae, a new association for this area belonging to Lemnetea minoris class. Some interesting phytogeographical problems are also discussed in order to clarify the S. polyrrhiza and Salvinia natans role in the regional vegetation
Stato delle conoscenze floristiche del Lazio.
No full textThis paper provided an update on the floristic knowledge of the Lazio region by using the categories adopted in the "Carta delle conoscenze floristiche d'Italia" of 1978 (Inform. Bot. Ital). The data are provided on a cartographic base
Phytoclimatic characterization of Quercus frainetto Ten. stands in peninsular Italy
No full textThe floristic differentiation of the deciduous Quercus frainetto forests along the climatic gradients of Apennine Italy has been studied. The ecological amplitude of this oak, and the bioclimatological relationships here assessed, suggest potentiality for the growth of Q. frainetto-rich communities as broad zonal vegetation belt, ranging from NW to SE along the W side of peninsular Italy. Strong floristical and ecological similarities to the balcanic stands are described. The status of real vegetation belt for the Italian Quercion frainetto s.l. is here emphasized
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
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