1,721,002 research outputs found
Geospatial and visual modeling for exploring sediment source areas across the Sele River landscape, Italy
No full textThis study uses the revised universal soil loss equation (RUSLE)
and Geographic Information System technology to map erosion-prone areas in the Sele basin (Campania-Basilicata regions, southern Italy).
Current land use/cover, soil erodibility and climate factors were evaluated to determine their effects on average annual soil loss. Geospatial technologies were applied to generate RUSLE factors and erosion map.
Long-term soil losses were 53 Mg ha–1 per year averaged over an area of 2500 km2 and more than 30% of the Sele basin was subjected to soil losses higher than 20 Mg ha–1 per year. Data available in the study area allowed to estimate soil losses, but the absence of direct sediment measurements prevents an accurate evaluation of the model performance.
Nevertheless, the results are similar to the ones from other studies, and provide useful preliminary information for landscape management and restoration
The GeoCaF project: proposal of a geosites network at Campi Flegrei (southern Italy).
No full textCampi Flegrei is a 75-km2 volcanic area located to the west of Naples, Italy. Declared a regional park in 1997, this area combines fascinating geology with its unique long natural history, unique customs and outstanding ancient Greek and Roman civilization. Campi Flegrei comprises a substantial number of sites that are remarkable in terms of their scientific quality, rarity, aesthetic appeal and educational value, most of which are valuable for their geological heritage, although their interest to scientists and the general public may also be archaeological, ecological, historical or cultural. The Campi Flegrei volcanic fields also represent one of the highest volcanic risk areas in the world. However, this fact is not fully appreciated by the inhabitants of the towns located within the area. All of these features make Campi Flegrei a very suitable area to be designated a volcanological Geopark, which would help to promote knowledge of the importance of active volcanoes in this area. A new detailed geological survey of the area has allowed us to identify many sites that are of high pedagogical and educational value. Using this survey as a starting point, we draw particular attention to seven geosites, namely, Cuma, Averno, Monte Nuovo, Solfatara, Piperno, Monte di Procida and Procida (GeoCaF network). All of these sites are also of lively archaeological and historical interest, as testified to by the numerous ancient documents collected and investigated during the research. Each geosite satisfies the criteria adopted for the most recent Italian geosites, i. e. representativeness, scientific interest, rarity, landscape value, educational value, accessibility, preservation and vulnerability. We therefore hypothesize a Campi Flegrei Geopark that includes these seven geosites, which are linked by roads and, occasionally, by collapsed tunnels that were dug in Roman times for military purposes. This geopark could represent a step forward in terms of the promotion of the geological heritage of this area by increasing the awareness of locals and visitors to future volcanic risks
Metodologie per la definizione della pericolosità nelle aree di vulcanismo attivo in Campania e implicazioni sulla pianificazione territoriale. Tesi di Dottorato - dott. Alberico Ines
No full textHazard and risk assessment in a complex multi-source volcanic area: the example of the Campania region, Italy
No full textIn order to zone the territory of Campania Region (southern Italy) with regard to the hazard related to future explosive activity of Somma-Vesuvio, Campi Flegrei and Ischia island, we drew a multi-source hazard map for tephra and pyroclastic flows. This map, which merges the areas possibly endangered by the three volcanic sources takes into account a large set of tephra fall and pyroclastic flow events occurred in the last 10 ka. In detail, for fall products at Campi Flegrei and Somma-Vesuvio we used the dispersal of past eruption products as deduced by fields surveys and their recurrence over the whole area. For pyroclastic flows the field data were integrated with VEI=4 simulated events; about 100 simulations sourcing from different points of the area were performed, considering the different probability of vent opening. The spatial recurrence of products of both past eruptions and simulated events was used to assign a weight to the area endangered by the single volcanic sources. The sum of these weights in the areas exposed to the activity of two sources and/or to different kinds of products was used to draw a hazard map, which highlights the spatial trend and the extent of the single equivalent classes at a regional scale. A multi-source risk map was developed for the same areas as the graphic result of the product of volcanic hazard and exposure, assessed in detail from a dasymetric map. The resulting multi-source hazard and risk maps are essential tools for communication between scientists, local authorities and the public and may prove highly practical for long-term regional-scale mitigation planning
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
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
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