1,721,059 research outputs found
Tectonically-related fluid circulation in the San Casciano dei Bagni - Sarteano area (M. Cetona Ridge - Southern Tuscany): a coupled structural and geochemical investigation.
No full textThe aim of this investigation is to examine the relationship between springs and structural setting of Mt. Cetona Ridge. This area represents an important regional morpho-tectonic feature oriented NNW-SSE, separated from the geothermal area of Monte Amiata to the West by the Radicofani Neogene Basin, while bound to the East by Valdichiana Neogene-Quaternary Basin. This Ridge is constituted by the Tuscan Nappe and the overthrusted S.Fiora Unit. A new detailed field mapping and structural study allowed recognising a polyphase structural setting defined by four plicative
followed by three extensional and transtensional phases.
Coupled to the structural investigation, 13 spring water samples were collected in the area in May and in August 2005. Groundwater ranges from cold, low mineralized calcium-bicarbonate to warm, highly mineralised, calcium sulphate. Results are in general agreement with previous studies
indicating the recharge area in the Cetona relief and a circulation in a highly fractured, quasicontinuous reservoir constituted by the Mesozoic limestone and the underlying Burano anhydrite
formation. Nevertheless, geochemical modelling indicates that the high variability in the hydrochemical and isotopic composition cannot be explained by simple binary mixing between two groundwater types nor by a geochemical evolution involving gypsum dissolution and calcite precipitation. Outflows are closely related to the structural setting of the area and hydrochemistry allows discriminating different fluids associated with specific hydrogeological circuits. The interpretation of the structural setting for Mt. Cetona Ridge was obtained by fieldwork studies integrating geochemical data of both thermal and cold springs. Results of this investigation allow to propose for this area a new tectonic evolution and fluid circulation model
Tectonically related fluid circulation in the San Casciano-Sarteano area (M. Cetona ridge, Southern Tuscany): a coupled structural and geochemical investigation
No full text
Deep seated gravitational slope deformation effects on Quaternary deposits in the Western Alps (NW Italy )
Full text linkDeep-seated gravitational slope deformations (DSGSDs) are well-known to affect the landscape and the morphology
of Alpine valleys. In contrast, little is known on their influence on Quaternary deposits. This paper, focused on the Western Italian
Alps, aims to fill this gap. Eight case studies, identified after a long term field experience, are presented, representative of different
geological settings. To fully define their distinctive features, such sites have been characterized using various methods: geological
surveys, geophysics and geomatic techniques.
DSGSD proved to influence the sediment deposition primarily with the continuous supply of centimetric/decimetric angular clasts.
This have different consequences on sediments, depending on their features, in some cases deeply modifying their typical facies
(i.e., glacial, colluvial and lacustrine sediments), whilst in other cases their influence is less evident (i.e., debris, avalanche and
torrential deposits). This paper can be a useful tool when dealing with DSGSD-related deposits, helping avoid misinterpretations
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
PRESERVATION OF QUATERNARY SEDIMENTS IN DSGSD ENVIRONMENTS: THE MONT FALLÈRE CASE STUDY (AOSTA VALLEY, NW ITALY)
Full text linkDeep seated gravitational slope deformations (DSGSD) in the Western Alps, which usually affect glacial valleys, produce strong deformation in both bedrock and Quaternary cover, generally favouring erosion. This research, which examines a DSGSD along the Mont Fallère southern slope in the Aosta Valley, suggests that DSGSD can also locally favour the formation and preservation of the Quaternary stratigraphic successionns for the following reasons: - the development of transversal elongated depressions, which are essentially connected with the onset of gravitational structures (trenches, minor scarps, and counterscarps) and filled by differentiated Quaternary successions; - the occurrence of closed depressions along the slope, which originate from the gradual evolution of gravitational structures (trenches or minor scarps and associated counterscarps) and are occupied by lakes that are progressively filled by lacustrine and palustrine sequences; - the occurrence of wide, flat, irregular surfaces that are characterized by lower erosional phenomena with respect to the surrounding steep slopes and preserve various Quaternary stratigraphic successions; - the development of rounded reliefs and associated wide depressions, both of which exhibit topographic surfaces that hang over torrential incisions that are located along the main fractures; this morphology favours the preservation of glacial, outwash, lacustrine and palustrine sediments; - wide colluvial and debris cover that buries and partially preserves older Quaternary sediments; - the local occurrence of a travertine cover and carbonatie-cemented sediments, which preserve the older Quaternary sediments. These morphological conditions are favourable to prehistoric human settlements, resulting in archaeological mountain sites that also provide a chronological reference for the evolution of DSGSD
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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