Search results for "grafi"
showing 10 items of 5213 documents
Boulevard Barbès: conflitto urbano e conflitto mediatico
2020
Questo studio esplora alcune modalità attraverso le quali il conflitto urbano può essere "preparato" e "percepito" attraverso la costruzione mediatica (strategie discorsive e retoriche), seppure non apertamente. A partire da una ricerca sul campo effettuata a Parigi, nel quartiere Barbès (una delle Zone di Sicurezza Prioritarie francesi), in occasione della vittoria della nazionale di calcio algerina durante i mondiali del 2014, lo studio si concentra sul modo in cui tifosi e residenti da un lato e polizia dall'altro costruiscono multistratificate retoriche del conflitto. Abbinando anche l'analisi di testi online (testate giornalistiche e blog) viene studiata la discrasia tra mediatizzazion…
Barbès, Parigi: conflitto urbano e conflitto mediatico
2020
Il capitolo propone una riflessione sul conflitto urbano da una prospettiva geografica, a partire da un caso studio rilevato nel 2014 nel quartiere Barbès a Parigi, dove, in occasione della qualificazione agli ottavi di finale della nazionale algerina ai Mondiali di calcio disputati in Brasile, molti tifosi si ritrovarono per festeggiare il risultato nel corso di un’intera notte. L’evento, giudicato a rischio dalle autorità, fece scattare un grande spiegamento delle forze dell’ordine. Si trovarono così contrapposte due dialettiche, potenzialmente conflittuali. Non si arrivò allo scontro e, per usare i termini di Barthes, i due “discorsi cittadini” si collocarono su due piani non collidenti.…
The Commodification Dilemma: Tourism Pressure and Heritage Conservation in Barcelona
2022
In recent years, the proliferation of tourists in the urban environment has generated several issues in the functioning of cities. As urban tourism has historically been linked to cultural and architectural attractions, this increased tourism pressure has involved and often compromised the common heritage uses. Therefore, many cases saw the implementation of measures that, if on the one hand reduced tourist flows, on the other also drastically restricted the access for residents and totally altered the sense of place in the community. This article explores this topic by applying a Critical Discourse Analysis methodology to the dispute that took place in Barcelona regarding the restricted ac…
Geochemical constraints on basalt petrogenesis in the Strait of Sicily Rift Zone (Italy): Insights into the importance of short lengthscale mantle he…
2020
Igneous activity from the late Miocene to historic time (most recently 1891 CE) in the Strait of Sicily has created two volcanic islands (Pantelleria and Linosa) and several seamounts. These volcanoes are dominated by transitional (ol + hy-normative) to alkaline (ne-normative) basaltic lavas and scoriae; volcanic felsic rocks (peralkaline trachyte-rhyolite) crop out only on Pantelleria. Although most likely erupted through continental crust, basalts demonstrate no evidence of crustal contamination and are geochemically similar to oceanic island basalts (OIB). Despite their isotopic similarities, there are considerable compositional differences with respect to major and trace element geochem…
Petrology and geochemistry of submarine volcanism in the Sicily Channel Rift
2006
Submarine magmatism in the Sicily Channel Rift began in the early Pliocene and lasted until almost 200 yr ago. We present here petrological and geochemical data on volcanic rocks dredged from Graham and Nameless banks and Pantelleria seamounts in the Pelagian sector of the Sicily Channel Rift. Petrological evidence suggests that the ascent of magmas to the surface was relatively rapid, probably through channels superimposed over the major tectonic discontinuities of the Rift. Major and trace element data indicate an ocean island basalt affinity for Graham and Nameless bank alkaline lavas and a depleted tholeiitic signature for one Pantelleria seamount, which had a shallower mantle source. S…
An Overview of the Hypogene Caves of Sicily
2017
Karst in Sicily develops in both Messinian gypsum and Mesozoic or Tertiary limestone rocks. Caves are also found in the basalts of Mount Etna. Except for some rare cases, until recently most caves developed in limestone were considered to be of epigenetic origin. The discovery of gypsum in some of these caves, and especially detailed morphological studies, have allowed defining a hypogenic origin for a dozen of caves up to now. In some of these, the hypogenic evidences are very clear, while others remain in doubt because of the widespread presence of well-developed condensation-corrosion morphologies not necessarily related to hydrothermal fluids. This paper reports the present knowledge of…
L'impact méconnu des chauves-souris et du guano dans l'évolution morphologique tardive des cavernes
2016
The little known impact of bats and bat guano in the late stages of cave morphogenesis. Bats are considered as symbolic caves inhabitants. The colonies, sometimes huge, may occupy caves through long periods. Large guano deposits were accumulated. Some have been mined for phosphates, either by hand or at the industrial scale. Bats impact is triple: breathing releases CO2, urine is corrosive, and guano mineralization releases acids (carbonic, nitric, sulfuric, and phosphoric). Such aggressive compounds have an effect on carbonate rock and flowstones, either by direct ground corrosion at the contact of the guano, or by condensation-corrosion on walls and ceilings. The speleogenetic impact of t…
Millstones as indicators of relative sea-level changes in northern Sicily and southern Calabria coastlines, Italy
2011
Abstract New data are presented for late Holocene relative sea-level changes in two coastal sites of Sicily and Calabria, southern Italy. Reconstructions are based on precise measurements of submerged archaeological remains that are valuable indicators of past sea-level position. The archaeological remains are millstone quarries carved on sandstone coastal rocks and nowadays partially submerged which, to the authors’ knowledge, are used for the first time as sea-level markers. Millstones of similar typology are located on the coast of Capo d’Orlando (northern Sicily) and Capo dell’Armi (southern Calabria). When the archeologically-based sea-level position is compared with the shoreline elev…
Il Beato Agostino Novello nelle arti decorative e nella cultura artistica dei secoli XIV-XIX tra Toscana e Sicilia
2012
L'articolo studia l’iconografia del Beato Agostino Novello nelle arti decorative e nella cultura artistica dei secoli XIV-XIX tra Toscana e Sicilia. Si tratta di un Beato agostiniano sulle cui origini, verosimilmente siciliane, sono state tramandate nei secoli scarse e discordanti notizie.
Contribution of HVSR measures for seismic microzonation studies
2018
The HVSR method applied to seismic noise can be a very useful technique to map the site effects of the territory, to identify the thickness of the soft covering and so the depth of the seismic bedrock. The case of the urban area of Oliveri is presented. Because of its high seismic hazard this area has been subject of first level seismic microzonation. The town lies on a large coastal plain made of mixed fluvial/marine sediments, overlapping a deformed substrate. In order to identify points on the area probably suffering of relevant site effects and to define a preliminary Vs subsurface model, 23 HVSR measurements were performed. A clustering technique of continuous signals has been used to …