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New data on a cave along the coast of Polignano a Mare (Apulia) by means of geological, geophysical and speleological researches
No full textLessons learned from occurrence of sinkholes related to man-made cavities in a town of southern Italy
No full textThe presence of man-made cavities below the historical parts of towns is a common feature in large portions of Italy. Different typologies of anthropogenic cavities have been excavated in different epochs for many purposes, including research and collection of potable water, establishment of underground working sites for olive oil production, worship sites, etc. Underground quarries are probably the most diffuse typology of subterranean cavities, especially the largest ones. Originally located at the outskirts of towns, quarries are increasingly found in built up areas due to urban expansion that has characterized the last century.
This paper describes the recent occurrence of sinkholes related to underground quarries in the town of Altamura, in the Murge plateau of inland Apulia, where since 2006 a number of sinkholes have formed above subterranean calcarenite quarries, the local rock mostly used for building purposes. These quarries developed below ground because the calcarenite is generally located covered by clays (ranging in thickness from a few to 15 meters). Their abandonment, and the progressive weathering of the rock, has caused failures in the underground quarries. Eventually, such instabilities propagated upward until reaching the surface, and producing sinkholes
La voragine di “San Procopio”a Barletta: analisi preliminari, rilievi speleologici e geofisici per la mappatura della pericolosità geomorfologica
No full textTra la sera del 2 maggio e le prime ore del
3 maggio 2010, in località San Procopio
in agro di Barletta, si verificava uno
sprofondamento di importanti dimensioni.
La voragine, di forma all’incirca circolare,
di diametro pari a circa 32 m e superficie
netta di 800 m2 circa, interessava svariati alberi
d’ulivo, un traliccio Enel e interrompeva
la strada comunale Via Vecchia Minervino. Ai
margini dello sprofondamento, profondo dai
5 ai 12 m, si intravedevano strutture cunicolari
di chiara origine antropica riconducibili
a gallerie sotterranee per l’estrazione della
calcarenite quale materiale da costruzione
(localmente detta “tufo” calcareo), dall’interno
delle quali i dissesti si erano propagati
alla superficie, determinando la formazione
della voragine
Le cave sotterranee di Altamura. Fasi operative per la mappatura e per il supporto alle attività di bonific
Get PDFLa presenza di cave sotterranee sotto aree
urbanizzate comporta un’evidente situazione
di rischio potenziale per le infrastrutture
e abitazioni sovrastanti, che si
manifesta sotto forma di sprofondamenti conseguenti
a fenomeni di dissesto degli ambienti
ipogei. Ad Altamura, dal 2006 si sono verificati
numerosi casi di sinkholes, a seguito dei quali
sono state avviate attività di esplorazione e rilievo
speleologico, integrate da studi geologici
e indagini geofisiche, in grado di fornire un
importante supporto alle operazioni di bonifica
attualmente in corso. Il presente contributo riassume
brevemente tali operazioni, evidenziando
il ruolo delle indagini speleologiche per la
corretta conoscenza del territorio
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Grotta della Rondinella a Polignano a Mare: un progetto di ricerca della Federazione Speleologica Pugliese
No full textGrotta della Rondinella (PU 71) è una tra le cavità più note
e suggestive della fascia costiera di Polignano a Mare, in
provincia di Bari. Essa presenta un doppio ingresso: da
terra, attraverso uno sprofondamento (sinkhole) e da mare
con un ampio portale che conduce a una bella spiaggia
in ciottoli. Sebbene inserita in un contesto certamente ad
alta vocazione turistica, la cavità, al pari delle molte altre
distribuite lungo la costa, non è mai stata adeguatamente
tutelata, per cui è di frequente oggetto di degrado, specialmente
durante la affollata stagione estiva. Grazie ad un finanziamento
privato, è stato avviato un progetto di ricerca
multi-disciplinare della Federazione Speleologica Pugliese,
comprendente un nuovo rilievo della cavità, indagini a
carattere geologico-strutturale e di geomorfologia ipogea,
analisi petrografiche e mineralogiche, indagini geofisiche
indirizzate alla verifica di eventuali prosecuzioni degli ambienti
ipogei. Inoltre, è stato messo in opera il monitoraggio
micro-climatico della cavità, e sono stati condotti studi
di carattere biospeleologico, con particolare riguardo ai
chirotteri, presenti con una piccola colonia nella grotta.
L’insieme dei dati così raccolti costituisce indubbiamente
un’importante banca dati su un singolo ambiente ipogeo,
raramente disponibile in Puglia
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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