1,721,133 research outputs found
L'effet Catlin à Paris
No full textThe Catlin effect. Paris, 1845-1846
The presentation of George Catlin’s Indian Gallery in Paris, from May to September 1845, then of two of his Indian portraits at the annual Salon in March 1846, did more than simply arouse public curiosity, but had an immediate effect upon the new generation of artists, for whom the museum-show and paintings provided unexpected inspiration for construction of a new aesthetic in which “the other in art”, i.e. all forms of creation a priori excluded from academic consideration, played a major role. The article compares the reactions of Théophile Gautier, George Sand, Gérard de Nerval, Champfleury and Baudelaire, all of whom were highly attentive visitors to the museum. While recognising Catlin’s contribution, they disagreed on the meaning of the “savagery” they discovered there: did it spring from the primitive, from the primordial or from the essence of art
Chinoiserie des Lumières. Variations sur l'individu-monde
No full textUno studio su alcune "variazioni" relative a una tematica che si situa al cuore dell'antropologia moderna: quella dell'ultimità e dell'individuo mondo. Un modo per riflettere sulle coordinate epistemologiche dell'antropologia e sulla storia della disciplina
The rock glaciers in the Argentera Massif (Western Alps, Italy): surface ground temperature, DC resistivity and regional comparison of permafrost limits
No full textPermafrost existence in the rock glaciers of the Argentera Massif (Maritime Alps, Italy).
No full textThermal and geo-electrical investigations were carried out on five rock glaciers in the Argentera
Massif to detect the presence of permafrost and to define its existence and activity elevation limits.
Ground surface temperature was monitored using digital dataloggers, and sub-surface ice occurrence
was inferred from one-dimensional geo-electrical soundings. Bottom temperatures of snow cover,
extracted from winter recordings, indicate possible or probable presence of permafrost for some rock
glaciers. Geo-electrical soundings reveal the existence of sediments rich and super-saturated with ice
for thicknesses often reaching several tens of metres. The limits for permafrost existence and for
rock glacier activity can thus be fixed respectively at about 2500m and 2600m ASL. The results
from 110 earlier geo-electrical soundings, carried out on rock glaciers in different sectors of
the southwestern Alps, were processed and compared with the results of this work. A general
classification of rock glaciers into active, inactive and relict was possible for the Argentera Massif.
Inactive and relict rock glaciers probably originated during colder Holocene and Late-glacial periods
Shallow active layer temperature and DC resistivity of a rock glacier in the Argentera Massif, Maritime Alps, Italy
No full textA monitoring of shallow active layer temperature and DC resistivity soundings were performed in the Portette rock glacier, in a region which is considered the southern boundary of permafrost existence in the European Alps. The aim of the work is to recognize the most important seasonal processes that condition the existence or thaw of the permafrost. A one-dimensional geo-electrical survey was adopted to define the permafrost thickness. The active layer temperature was monitored hourly for four years using a digital data logger and a thermistor placed at 20 cm depth. The active layer temperature of three other rock glaciers in the surrounding area was monitored at the same depth and using the same instrumentation. The observed resistivities exceeding 100 k Omega m have been interpreted as permafrost affected layers, in accordance with other active rock glaciers in the Southwestern Alps. The thickness of the permafrost layer exceeds tens of metres both in the upper and middle part of the Portette rock glacier. The thermal behaviour of the active layer is strongly characterized by the occurrence of non-conductive and seasonal heat transfer processes, i.e. release of latent heat during phase change, snow melt infiltration and evidence of air circulation. Thermal events associated with these processes were synchronously registered in the shallow active layers of the other three rock glaciers, evidencing a common thermal behaviour of the Argentera rock glacier during the monitoring period. The ground-air temperature coupling/decoupling indicates that the thickness and establishment of snow cover strongly regulates the occurrence and intensity of these seasonal processes. Delayed and thin snow cover in autumn represents a forcing factor for permafrost maintenance/aggradation because it allows i) a strong cold penetration into the ground, ii) a lack/reduction of the Zero Curtain effect and iii) a downward cold and dense air funnelling. The comparison of the results with regional climatic data indicates that in the Argentera Massif only slight inter-annual variations in meteorological conditions, i.e. an early/delayed snowfall season and intense ground cooling before snow cover appearance, prompt a rapidly shifting morphoclimatic situation, from conditions favourable for permafrost presence/aggradation to unfavourable ones
Geoelectrical resistivity of some rock glaciers in the Wrangell-St Elias Range, Alaska-Yukon
No full textLimites non frontières du Sauvage
No full text"I limiti che attraversano e articolano un mondo sociale, e diversi mondi sociali tra loro, questo il soggetto di un libro davvero interessante di Marcello Massenzio, intitolato "Sacro e identità etnica", da cui il presente contributo muove per allargare i termini di una problematica- quella relativa ai confini tra natura e cultura - sempre da riformulare alla luce delle nuove acquisizioni e dei numerosi problemi epistimologici caratteristici delle nuove scienze umane.
The lower discontinuous permafrost boundary in the Argentera Massif (Marittime Alps, Italy): insight from rock glacier geo-electrical soundings
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