1,721,065 research outputs found
Atti del convegno "Cambiamento climatico: analisi ed impatti su specie ed ecosistemi vegetali". Gruppo di Ecologia della Società Botanica Italiana
No full textIl volume comprende gli atti del convegno "Cambiamento climatico: analisi ed impatti su specie ed ecosistemi vegetali", organizzato il 18 Aprile 2012 presso l'Università dell'Insubria (Varese) dal Gruppo di Ecologia della Società Botanica Italiana. Nel volume sono riportati i riassunti di tutte le presentazioni, sia orali che poster, e dei riassunti estesi. I lavori si riferiscono ai più recenti risultati della ricerca scientifica italiana sugli impatti del cambiamento climatico su specie ed ecosistemi vegetali
Non-native species distribution along the elevation gradient in the western Italian Alps
Full text linkIn this work the occurrence of non-native species was recorded along the elevation gradient in the Alps, in order to establish their distribution pattern, their current altitudinal limits and to elucidate which species are presumably adapted to higher elevations. Plots were located along the course of rivers in five valleys from 100 to 2100 m a.s.l. Sixty-eight non-natives were recorded in the study area. The proportion of invasives was found to be much higher in the study area then in the whole administrative region. The number of non-natives per plot decreased strongly with increasing elevation. The great majority (94%) of the non-native species grows at the lowest elevations, while only 6% survive up to 1500 m and none was found above this limit. Results were interpreted considering the factors driving the invasion process (disturbance, the native communities' resistance to invasion, propagule pressure, climatic conditions) and plant traits with particular respect to preadaptation to the harsh climate, which increases progressively with elevation. Results confirm that the Alps are not immune from invasion, at least up to medium elevation
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
Hydrogen bonding, protonation and twisting in the singlet excited state of some 2-(4-aminophenyl)pyridooxa-, -thia-, and -imidazoles
No full textProprietà chimico-fisiche delle soluzioni di tensioattivi gemini bipiridinici di nuova sintesi.
No full textThermodynamic Study of of Some Potassium 4-((Alkylcarbonyl)-Amino)-Benzoate and 2-Hydroxybenzoate, and 3-((Alkylcarbonyl)-Amino)4-Hydroxybenzoate Aqueous Micellar Solutions
No full textRoot morphometric analysis and soil AM inoculum potential evaluation in three different herbaceous communities (NW Appennines, Italy)
No full text- …
