1,721,193 research outputs found
A peculiar stratified slope deposit in the Val Grande di Palanfrè (Southern Maritime Alps)
No full textGeomorphic evolution of the seaword escarpment in the NE Ligurian Alps(Italy)
No full textSummary. Morphologically, the NE Ligurian Alps is an asymmetric ridge very close to the
Ligurian Sea, with a gentle flank in the interior (Adriatic flank) and a steep flank facing the
nearby sea (Ligurian flank). As such, the NE Ligurian Alps represent a seaward escarpment.
The asymmetry of the two opposite escarpment flanks were quantified in terms of slope and
general morphology. Several morphometric characteristic of the seaward Ligurian flank
drainage network were analyzed. In particular, among the five Ligurian rivers that drain the
escarpment on the seaward flank, (i) the convex shape of the Sansobbia and the Cerusa uppermost
divides, together with (ii) field evidence of the high regressive power of their channels,
(iii) the highest grade of hierarchical anomaly in the organization of their ordered channels
and (iv) the highest values of drainage density all indicate that these two rivers are withdrawing
and the escarpment is retreating at the expense of the inland Adriatic flank. The different
azimuthal patterns of the channels on both flanks of the escarpment, together with a different
rock erodibility, makes the escarpment evolve in two ways at the head of the Sansobbia
(SW) and Cerusa (NE) rivers. In the SW sector, the presence of weak rocks and large portions
of the Adriatic rivers flowing parallel to the escarpment edge are causing a retreat via
fluvial captures that, with time, will lower the edge and reduce the escarpment asymmetry.
This is evidenced by the presence, within the Sansobbia basin, of windgaps and a high concentration
of nearly-flat surfaces, once part of the gentler Adriatic flank and now remnants
of a paleo-landscape pinched along the steeper Ligurian flank. In the NE sector, where no
evident windgaps or paleo-surfaces were found, harder rocks and azimuth channels perpendicular
to the edge slow the retreating processes thus preserving the escarpment asymmetry
for a longer time
Drainage network geometry versus tectonics in the Argentera Massif (French–Italian Alps)
No full textThe Argentera Massif (French-Italian Alps), with its uniform lithology, was selected to evaluate how known Plio-Pleistocene tectonics have conditioned the drainage network geometry. The drainage network was automatically derived and ordered from a 10 m-resolution DEM. On hillshade images, alignments of morphological features were identified. The Massif was subdivided into 22 domains of 50 km(2) within which the directions of every river channel segment and the direction of the aligned morphological features were compared and contrasted with the strike of tectonic structures measured in the field. Results suggest that the Argentera drainage system is variously controlled by recent tectonics, depending on the Massif sector taken into account. In the NW sector, the vertical uplift is less because the strain has been accommodated in an oblique direction along a lateral thrust. In the SE sector, strain in a predominantly vertical direction along a frontal thrust has resulted in a major vertical displacement. Accordingly, the NW sector is characterized by (i) a strong geometric relationship between the main tectonic structures and the directions of river channels, (ii) longitudinal main rivers bordering the Massif, and (iii) a general trellis pattern within the domains.
In the SE sector, the prolonged uplift has forced an original longitudinal drainage system to develop as a transverse system. This change has occurred by means of fluvial captures that have been identified by the presence of windgaps, fluvial elbows and knickpoints. At the domain scale, intense uplift of the SE sector has prompted the drainage pattern to evolve as a dendritic type with no clear influence of structure in the channel orientations. (c) 2007 Elsevier B.V All rights reserved
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
External communication on legal compliance by Italian waste treatment companies
No full textNumerous studies discuss the role of environmental reporting to communicate legislative compliance, but few papers focus on the waste treatment sector, where clear communication is crucial for companies to legitimize management strategies. To fill this gap, an explorative study focusing on solid waste treatment by Italian companies registered with the European Environmental Management and Audit Scheme was conducted. The aim of the research is to discover if and how these companies inform external stakeholders about compliance with environmental legislation in (1) assessing environmental aspects, (2) planning environmental objectives, and (3) monitoring environmental performance. Forty-nine Italian companies were selected, and their Environmental Statements were analyzed. The results prove that environmental reporting of Italian companies frequently includes an explicit reference to legislative compliance in planning environmental objectives; however, rarely legal compliance is assumed as criterion to assess environmental aspects and to monitor environmental performance. Comparing these results with other recent studies, some conflicting findings emerge: the risks derived by the lack of explicit information on legal compliance in environmental reporting are discussed, and recommendations to assure transparency and credibility of reporting are underlined. Final propositions and future perspectives for practitioners and scientists conclude the paper, which contributes to the debate about the adequacy of external communication of environmental management systems in waste treatment sector
Climatologia e idrologia nel bacino del Torrente Roglio (Val d'Era-Toscana) in relazione ai processi morfogenetici in atto
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