1,720,997 research outputs found
Il rimboschimento sperimentale. Evoluzione nel tempo di rimboschimenti artificiali e naturali dopo il passaggio del fuoco in popolamenti di conifere del piano subalpino
No full textAssetto strutturale e qualità dei fusti in cedui di faggio in conversione nel Parco Nazionale del Gran Sasso-Monti della Laga (AP)
No full textIn three sites correspondent to different steps of the conversion process (abandoned coppice, stands with first and second thinning) we have measured forest structure and assessed timber quality of stems. The vertical structure is very similar in the three sites, but stem damages increase with the number of thinnings. Current management does not seem suitable to guarantee both timber supply (mainly fuelwood) and nature conservation
Le dinamiche del paesaggio forestale: evoluzione temporale del bosco di neoformazione sui pascoli di Corte Pogallo - Parco Nazionale della Val Grande (VB)
Full text linkThe aim of the present study was to investigate forest expansion, dynamics
and recolonization of former crop lands, fallows and hayfields in a mountainous area (Corte Pogallo - 777 m
s.l.m.) located within Val Grande National Park (VB - Italy). The site has been characterized by mountainous
forests for ages, until the beginning of XXth century, when a timbering company was settled there. The whole
area has been hardly deforested until the 1960, when the settlement has been completely abandoned. By
matching historical (1954, 2000) aerial photographs with several test plots on the ground, the dynamic evolution
of the area at the study site was analyzed using a multi-scale sampling method. To assess the stand
structure, two transects were established starting from the crop fields (occurring at the valley floor) up to the
beech coppice stand (occurring along the mountain slope). A mixed composition of pioneer forest species
and fruit trees was found at the ecotone, while pioneer species became more and more dominant along the
slope up to the beech coppice stand (the former forest margin before abandonment). Using a GIS software,
pinpoint sample data and historical aerial photographs were combined and compared. Maps of land-use
change revealed that forests have recolonized about 71% of the former crop area since the last fifty years
(1954-2000)
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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