1,720,978 research outputs found
Valorizzazione geoturistica del patrimonio sotterraneo naturale della Basilicata: una proposta di connessione interregionale
No full textGeochemical characterization of clastic sediments sheds light on energy sources and on alleged anthropogenic impacts in cave ecosystems
Full text linkCaves are usually oligotrophic ecosystems, where the organic matter represents a limiting factor to the hypogeal community and sediments are often a significant energy source. With a view to identifying the energy input influencing the ecological processes occurring in caves, as well as the potential alteration sources of the natural equilibriums, geochemical features of several typologies of clastic sediments from the Pertosa-Auletta Cave (Italy) were investigated. The collected sediments, analyzed for a number of chemical (organic matter, Al, B, Ba, Ca, Cd, Co, Cr, Cu, Fe, K, Li, Mg, Mn, Mo, Na, Ni, P, Pb, S, Si, Sr, Ti, V, Zn concentrations) and mineralogical (quartz, calcite, dolomite, clay minerals) characteristics, showed a different composition. Overall, their origin is supposed to be allochthonous, related to the important fluviokarst activities interesting the cave in the past, whereas the abundance of calcitic and dolomitic compounds can be autochthonous, being the carbonate the main host rock. The highest concentrations of organic matter, together with C, Cu, Mo, N, P, Pb, S and Zn, highlighted in one sample composed mainly of bats guano, revealed an important bioavailable energy input as well as a pollutant accumulation, mainly of anthropogenic origin
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
La Basilicata: una regione piccola con un enorme patrimonio carsico
Full text linkIn questo lavoro si descrivono le principali aree carsiche e grotte presenti in Basilicata. Si sottolinea
l’importanza scientifica delle cavità, messa in luce da svariati lavori effettuati negli ultimi dieci anni, ma anche
la valenza culturale delle cavità rupestri che la Regione vanta. L’intento è quello di risvegliare l’interesse per
questi luoghi, per certi versi ancora sconosciuti, e ripristinare delle spedizioni sistematiche per arricchire la
conoscenza del territorio lucano in maniera da poter contribuire ad una miglior tutela e salvaguardia del
patrimonio carsico
Relazioni tra assetto morfostrutturale e carsismo ipogeo dei Monti Alburni (Campania): risultati preliminari
No full textMorphometric analysis of karst features of the Alburni Mts, southern Apennines, Italy
No full textWith more than 250 caves, the Alburni Mts represent one of the most important karst areas of southern Italy. The backbone of this ridge is constituted of Mesozoic-Cenozoic limestone with limited outcrops of Miocene siliciclastic formations and internal shale units, often trapped in elongated downthrown structures. NW-SE- and NE-SW-trending faults
with a clear morphological expression are responsible for the genesis of a squared framework of flat-topped ridges and flat-bottomed valleys at the top of the massif. In an approximate way, the Alburni Mts can be described as a roughly
NW-SE-trending monocline, dipping toward the SW, covering an area of about 350 km2. The fault system has partially disrupted an ancient flat landscape, as testified by the widespread fragments of the Southern Apennines late Pliocene - early Pleistocene summit palaeosurface. This work aims at understanding the role played by tectonic structures on karst development based upon a morphometric analysis. We also try to constrain the age of the karst phenomena using the relationships among morpholineaments, land surfaces, and other morphotectonic markers. New data, besides confirming the role of the map-scale faults as a controlling factor of the surface and hypogean karst development, also highlight the strong influence of the small-scale faults and pervasive jointing. Further, the presence of different levels of hypogean karst
seems to trace the arrangement in several orders of land surfaces, thus suggesting a discontinuous lowering of the (relative) erosion base level due to a multi-phase tectonic uplift
Morphostructural analysis of the Alburni carbonate massif, southern Italy: first results and remarks about the seismo-tectonic hazard
No full textOur work aims to reconstruct the morpho-evolutionary history of the Alburni Mts, an impressive, significantly
karstified, carbonate massif of the Campania segment of the southern Italian Apennines (Fig. 1), and to define
the seismo-tectonic hazard deriving by its dense Quaternary fault networks. To this scope, a morphostructural
analysis has been carried out to map morpholineaments, land surfaces, and other morphotectonic markers.
Further, structural data about fault and fracture systems have been collected from both surface and subsurface
survey, using in the latter case the extended net of explored karst caves. The Alburni Mts represent in fact the
major karst area of southern Italy, including 243 underground caves. The study area is located inside the
National Park of Cilento and Vallo di Diano and is bordered by two major rivers such as the Calore and Tanagro
rivers, along which there are many villages and small towns. This area has been repeatedly affected in the last
centuries by the effects of the activity of a regional, partly blind, NW-SE-striking fault system responsible for
several huge earthquakes.
From a morphostructural viewpoint, The Alburni Mts constitute a quite simple NW-SE-trending monocline,
dipping toward SW. The massif covers an area of about 250 km2 crossed by several sets of faults, often showing
a clear morphological expression, responsible for the genesis of a squared framework of flat-topped ridges and
flat-bottomed valleys at the top of the massif. Its geological backbone is made of a thick succession of Mesozoic
and Cenozoic limestones, partly referred to a back-reef environment, locally covered by Miocene terrigenous
units. Such unit derives from the deformation of the African-Apulian palaeodomain of the Campania-Lucania
Platform (D’Argenio et al., 1975; Patacca and Scandone, 2007). Cretaceous to Oligocene deep-sea internal units
have been also trapped in some extensional troughs at the top of the massif, after their regional thrusting on the
African palaeomargin units
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
- …
