1,720,962 research outputs found
Strategie di gestione degli alberi monumentali: considerazioni tecniche sul caso di studio dell’oleastro di Luras (Sardegna)
No full textAgro-biodiversity decrease and relations with landscape ecology in the Asinara National Park (Sardinia, Italy)
No full textIn the last few decades, a remarkable losses of biodiversity has occurred in Europe, in part caused
by ecological effects of changes in agricultural systems production. This changes affect the character of landscapes and the availability of genetic resources. Further loss of species could accelerate the
changes in ecosystem processes, but it is not clear how these changes, as compared to direct effects of the other forms of environmental change, influences diversity loss and alteration of the ecosystem
functions. The marginal agricultural areas are particularly affected by diffuse habitats alterations. In these
cases, Agro-ecology analysis allows to distinguish between land cover and land use, supporting the
description of the interrelations between agro-biodiversity and landscape types. Often, different levels of biodiversity match different landscape expressions.
The aim of the study is to verify the sustainability of agricultural models activities oriented to the
improvement of agro-biodiversity levels, as connected with habitat and species conservation within
protected natural areas in the study case of the Asinara National Park (Sardinia, Italy). The functional agricultural land use in protected areas must be also representative of the culture and the knowledge of
the rural traditional context
Asinara landscape history
No full textHumans first settled on Asinara island in the Neolithic Age. Over the centuries (from the Roman Age to the Kingdom of Aragon) because of its geographic position, the island became a base for sheltering vessels in bad weather conditions and for protecting the Sardinian mainland from attacks by pirates and conquerors.
After the XVII century, some Sardinian shepherds and Ligurian fishermen established themselves in a few settlements. Grazing became the most important land use all over the island. In 1885, the Italian Kingdom evicted the few families left living on the island and transformed Asinara into an agricultural penal colony and lazaret. Change in Island use began: 400 convicts and prison guards shaped 230 hectares from semi-natural and natural cover to cultivated areas. Agricultural products were destined for use in the penal colony and as animal food. This continued until about 1980 when the agricultural colony became a maximum security prison; all agricultural activities gradually decreased until they completely disappeared as prisoners could no longer work the land.
In 1999 Asinara become a National Park. The most important heritage of agricultural activities is the considerable presence of freed livestock. Today the natural pasture is the last practice connected to agricultural traditions
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
Local landscape dynamics in a traditional cork-oak agro-forest system (Sardinia)
No full textTheAlta Galluraregion contributed to the development of Italian cork industry that since the nineteenth century has driven the improvement of a multi-functional model based on the breeding of beef cattle into the cork oak forests.The study case is a cork-oak agro-forest farm extended to 212 hectares, with a quantity of livestock close to 0.1 LU ha-1. It were collected data from the farm registry (business records of the last 70 years) and by photo-interpretation of images related to 1955 (GAI), 1977 (CGR), 2006 (Terra Italy) and 2013 (AGEA)
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
- …
