1,721,115 research outputs found
Pennetta M., Nappi R., Sica M., Stanislao C. e Donadio C.
No full textRiassunto
Il riconoscimento e l’interpretazione di elementi tettonici, litostratigrafici e geomorfologici, antichi o recenti, nonché di strutture geoarcheologiche in quanto geoindicatori, sono utili per ricostruire l’evoluzione dei vari morfotipi costieri, di cui si analizzano alcuni casi studio. I recenti studi dell’ambiente marino costiero della Campania hanno aggiornato il quadro geomorfologico e sedimentario. La suddivisione in principali ambienti (spiaggia emersa e sommersa, falesia e piede di falesia) ha permesso di raggruppare aree con processi simili, attivi o meno, e correlare le forme alle zone emerse. Va studiata anche la fascia dunare, poiché riveste un ruolo basilare nell’equilibrio ambientale del sistema di spiaggia. Gli effetti dell’erosione si riflettono pure sulla vegetazione, che mostra un forte stato di stress. I processi erosivi sono messi in relazione con le pressioni antropiche che hanno agito nel tempo in modo diretto o meno, innescando o accelerando fenomeni che riducono la resilienza del sistema naturale.
Abstract
Recognition and interpretation of tectonic, lithostratigraphic and geomorphic elements, ancient or recent, and geoarchaeological structures, represent useful geoindicators to reconstruct coastal dynamics. The recent coastal geological mapping of Campania provided a new reading of the coastland. In this way, the surveys update the whole geomorphologic and sedimentologic framework. Sea cliff and cliff base, emerged and submerged beach should be surveyed, with the aim to group waterscapes with same processes and correlate their shapes. Also the coastal dune should be studied, as it plays a key role in the balance of a littoral for its positive effect on beach system. Among factors contributing to coastal erosion, the anthropogenic pressure acts a reduction of resilience of natural syste
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
Canali da rip currents nella spiaggia sommersa presso la foce del Fiume Sele (Golfo di Salerno, Italia) .
No full textThe GIS-based analysis and comparison of submerged beach's volumes and morphologies detected during two different bathymetric surveys at the mouth of Sele River, allowed detecting the presence of channels and lens-shape sandy bodies. They are seaward stretched, placed at the right angles to the shoreline, and can be a reasonably interpreted as rip current channels. Rip currents are fast, narrow currents fl owing seaward through the surf zone, within topographically constrained channels incised on the seabed. These currents cut the submerged sandbars system that, probably were originally continuous and parallel to the shorelines. The resulting features are small transverse sandbars. Among other things, rip currents are responsible for the continuous morphological changes of the subaerial beach and of the typical rhythmic shoreline, with alternating embayments separated by horns. The embayments are located in correspondence of rip channels, while the cups laid out at the bars edges, on which the incident waves break. The rip currents erosion on the seabed extended over subaerial beach, causing erosion processes on the dune and discontinuity in the dune system. Such embayments contribute to the coastal erosion hazard by causing 'hotspots' of erosion. Moreover, rip currents give coast signifi cant hazard to swimmers. It has been identifi ed, fi nally, an increase in volumes of sediment moved along the coast in the coastal stretch to the left mouth of Sele River; this morphosedimentary arrangement can be justifi ed as result of longshore sediment transport from NW to SE
Sviluppo e sperimentazione di un sistema di monitoraggio centralizzato per flotte di veicoli
No full textRip cannel patterns on the beach near the mouth of Sele River (Southern Italy)
No full textThe analysis of long-term measurements carried out on the coast of Sele River, located on the western margin of southern Italy, showed a rather articulated morphology of the submerged beach. Along it several channels perpendicular to the shoreline were found, which affecting the original bars parallel to the shore, thus they have shrunk dramatically. These channels are developed mainly between 0 and 5 meters deep and, according to the sedimentological characters, play a significant role in the seaward transport of sediments removed from the bottom. More specifically, the bars are constituted by fine and relatively unsorted sands, while the channels are characterized by the presence of sandy and sorted sediments. The increased size of the sediment in the channels as well as its better selection correlates well to the high hydrodynamic energy of flowing water in the channels probably modeled by rip currents. The presence of these currents has been confirmed by some bathymetric surveys.
The rip currents are also responsible for the morphological changes of the emerged beach and of the typical rhythmic shoreline, with alternating embayments separated by cusps. The embayments are located in correspondence of the head of rip channels, while the cusps laid out at the bars edges, on which the incident waves break. The rip currents erosion on the seabed extended over the inner portion of the emerged beach, causing erosion processes on the dune and discontinuity in the dune system. Such discontinuities promote the genesis of blowouts and parabolic dunes on the beach, that can be the first sign of severe erosion of the coastal system, which is already quite evident in the investigated coastline
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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