0000000000534702
AUTHOR
M. Carapezza
La logica e il mito del linguaggio perfetto
L'articolo sostiene che il sogno di una "linguaggio perfett", inteso come un mezzo di espressione universale e semanticamente trasparente sia strettamente connesso al mito della razionalità istantanea. Il linguaggio logicamente perfetto sarebbe infatti un linguaggio nel quale tutte le relazioni logiche divengono immediatamente visibili, e la questa linguaggio, possa pensare per noi (frege, 1884). nella prima parte dell'articolo si ricostruisce la storia di questo tipo di linguaggio perfetto da Leibniz e Wittgenstein. nella seconda parte si mostra come tale linguaggio non possa esistere sulla base di recenti risultati in logica e computer science. We argue that the dream of a ‘perfect langua…
Geochemical surveillance of the Solfatara of Pozzuoli (Phlegraean Fields) during 1983
Geochemical surveillance of the Phlegraean Fields area has been intensified since 1983, in response to the increased uplift rate (brady-seismic activity). Fumarolic gases from Solfatara (Pozzuoli) were sampled and analyzed monthly. A Reducing Capacity (RC) monitoring unit was installed at Soffione, the most active fumarole in the Solfatara system. The preliminary analysis of the RC temporal variations suggest they are consistent with the rate of the seismic energy release. The composition of fumarolic gases indicates that the equilibrium temperature and pressure are higher than those of sampling. The observed variations in CH4 content are explained as an increase of pressure (from 1982 to t…
CO2 and H2S concentrations in the atmosphere at the Solfatara of Pozzuoli
The CO2 and H2S concentration in the Solfatara atmosphere has been measured. The concentrations of both gases are higher neraby the more active areas and decrease away from them. A sharp horizontal and vertical gradient of the CO2 content has been recognized.
Noi, e non i gatti, ci facciamo immagini dei fatti
L'articolo discute la teoria dell'immagine del tractatus logico-philosophicus di Wittgenstein, a partire dall'immagine dello specchio adottando un punto di vista interpretativa debolmente "resolute".
Fluid geochemistry of the San Vicente geothermal field (El Salvador)
The volcano Chichontepeque (San Vicente) is one of the nine recent volcanoes making up the El Salvador sector of the WNW-ESE-trending active Central American volcanic belt. Thermal activity is at present reduced to a few thermal springs and fumaroles. The most important manifestations (Agua Agria and Los Infernillos Ciegos) are boiling springs and fumaroles located on the northern slope of the volcano (850 m a.s.l.) along two radial faults. The chloride acid waters of the Los Infernillos area are partly fed by a deep hydrothermal aquifer (crossed at 1100–1300 m by a geothermal exploration well), which finds a preferential path to the surface through the radial fault system. C02 is the most …
New Insights into the Provenance of the Obsidian Fragments of the Island of Ustica (Palermo, Sicily)
In this study we applied a multidisciplinary approach, coupling geophysical and geochemical measurements, to unveil the provenance of 170 obsidian flakes, collected on the volcanic island of Ustica (Sicily). On this island there are some prehistoric settlements dated from the Neolithic to the Middle Bronze Age. Despite not having geological outcrops of obsidian rocks, the countryside of Ustica is rich in fragments of this volcanic glass, imported from other source areas. The study of obsidian findings was carried out first through visual observations and density measurements. At least two different obsidian families have been distinguished, probably imported from Lipari and Pantelleria isla…
Genesis and evolution of the fumaroles of vulcano (Aeolian Islands, Italy): a geochemical model
A geochemical model explaining the presence of fumaroles having different gas composition and temperature at the top of the crater and along the northeastern coast of Vulcano island is proposed. A pressurized biphase (liquid-vapor) reservoir at the depth of about 2 km is hypothesized. Energy and mass balance sheets controlP-T conditions in the system.P-T must vary along a boiling curve of brine as liquid is present. The CO2 content in the steam is governed by the thermodynamic properties of the fluids in the H2-NaCl-CO2 system. On the assumption that oxygen fugacity in the system is between the HM-FMQ oxygen buffers, observed SO2/H2S, CO2/CO, CO/CH4 ratios in the fumarolic gases at the Foss…
Helium and CO2 soil gas emission from Santorini (Greece)
Soil gas investigation is a useful tool to detect active faults. The sudden appearance of soil gas anomalies in zones of deep-reaching faults represents a promising potential precursor of earthquakes and volcanic eruptions. In volcanic areas the development of soil gas monitoring techniques is particularly important, as they can represent, together with remote sensing techniques, the only geochemical methods that can be safely applied during volcanic unrest, when it becomes impossible or too dangerous to sample crater fumaroles. A soil gas survey was carried out in June 1993 at the main island of Thera, in the Santorini volcanic complex. CO2 flux and CO2 and helium concentrations were measu…
Il gioco linguistico del significato letterale
Literal Meaning is a widely used notion, which seems to be well rooted in the strong intuition that words have a meaning in themselves. However, as pointed out in previous literature (e.g. RECANATI 2004), this theoretical notion seems to be problematic in accounting for some aspects of the nature of linguistic meaning. Embracing these criticisms, we will show how the heuristic power of this notion becomes apparent when looking at some specific types of contexts, namely those language games where it is necessary to retrieve the meaning of words in isolation. This will allow us to argue in favour of consistency of this notion with theoretical framework with a strong focus on the contextual na…