2,617 research outputs found
Alle radici della "vissutezza". Colli e Böhme
No full textIl saggio interroga una delle fonti del pensiero di Colli ancora rimasta in ombra o, almeno, non sufficientemente considerata negli studi critici sul filosofo torinese. Si tratta di Jakob Böhme, teosofo sassone, esponente della cosiddetta eterodossia luterana, che visse tra 1575 e 1624. Dopo una breve introduzione di carattere storico-filologico, approfondisco tre aspetti del rapporto tra Colli e Böhme: il primo sulla relazione tra “vissutezza” o visione ed espressione; il secondo sulla analogia tra la metafisica del giovane Colli e la teosofia böhmiana; il terzo sulla particolare concezione del rapporto tra materia e spirito
Sistematicità intrecciata, non lineare. Le implicazioni filosofiche dello stile aforistico in Giorgio Colli
No full textLa scrittura del filosofo italiano Giorgio Colli è caratterizzata, questo è noto, da uno stile molto vivido e personale. Questa relazione ha l'obiettivo di ripercorrere la sua produzione scritta per cercare di rintracciare le costanti che ne hanno definito l'alto valore anche sul piano espositivo e letterario. Si dimostrerà, quindi, che questo tipo di stile riflette nella forma un'indagine filosofica sul valore comunicativo della filosofia, in particolare attraverso forme non sistematiche come l'aforisma, che è alla base delle ricerche più prolifiche di Colli
Volcanic hazards of the Colli Albani
No full textAlthough controversy exists about the age of its most recent eruption (either 36 ka or
,23 ka), Colli Albani volcano is unanimously considered to be quiescent and not exinct.
During the Holocene, several lahars were generated by overflows from Albano crater lake up to the fourth century BCE, when the Romans excavated a drainage tunnel to keep the lake level below the crater rim. Such recent activity, together with the frequent occurrence of seismic swarms underneath the crater zone, the ongoing uplift of the volcanic edifice and the magmatic affinity
of the emitted gas, indicate the presence of an active magma chamber. The most likely site for a new eruption is the deep crater hosted in the southern part of the Lake Albano, where the last eruptive events occurred. Any eruption would have a strong explosive character enhanced by the interaction of magma with the water of the lake and would endanger a densely inhabited area up to the outskirts of Rome. The hazard of a new overflow from Lake Albano is very low because of the present low level of the lae. There is instead a potential for CO2 release from the deep lake water following the occurrence of rollovers, which would threaten the lake shore, a site where
thousands of people spend their vacations in the summer. However, the content of dissolved
CO2 is presently far from saturation and no Nyos-type events will occur today. Presently, the main hazard is related to strong gas emissions (CO2, H2S and Rn) from fractured zones and gas blowouts from wells reaching shallow gas-pressurized aquifers.Published279 – 2974.3. TTC - Scenari di pericolosità vulcanicareserve
Diffuse degassing of carbon dioxide on the NW sector of Colli Albani volcanic complex (Rome, Italy)
No full textSystematic CO2 soil flux surveys at Cava dei Selci on the Colli Albani volcano (28 seasonal surveys since the year 2000) have shown a significant variation of diffuse CO2 release, with a marked decrease, from 25 to 4 tonnes/day, from May 2000 to August 2004, followed by a new increase. Over the same period, CO2 flux halved at S. Maria delle Mole (16.8 tonnes/day in 2000 and 8.3 tonnes/day in 2006). Also the quantity of CO2 dissolved in the deep waters of the Albano crater lake decreased by one order of magnitude in the period 1997-2006. The high CO2 flux values in 2000 could represent the “tail” of a strong degassing episode recorded at Colli Albani in 1995 and related to local earthquakes. The following decrease of CO2 flux could reflect a permeability decrease caused by hydrothermal calcite precipitation favored by PCO2 reduction in the deep sourcePublishedKunming, China4.5. Degassamento naturaleope
Volcanic hazards of the Colli Albani
No full textAlthough controversy exists about the age of its most recent eruption (either 36 ka or
,23 ka), Colli Albani volcano is unanimously considered to be quiescent and not exinct.
During the Holocene, several lahars were generated by overflows from Albano crater lake up to the fourth century BCE, when the Romans excavated a drainage tunnel to keep the lake level below the crater rim. Such recent activity, together with the frequent occurrence of seismic swarms underneath the crater zone, the ongoing uplift of the volcanic edifice and the magmatic affinity
of the emitted gas, indicate the presence of an active magma chamber. The most likely site for a new eruption is the deep crater hosted in the southern part of the Lake Albano, where the last eruptive events occurred. Any eruption would have a strong explosive character enhanced by the interaction of magma with the water of the lake and would endanger a densely inhabited area up to the outskirts of Rome. The hazard of a new overflow from Lake Albano is very low because of the present low level of the lae. There is instead a potential for CO2 release from the deep lake water following the occurrence of rollovers, which would threaten the lake shore, a site where
thousands of people spend their vacations in the summer. However, the content of dissolved
CO2 is presently far from saturation and no Nyos-type events will occur today. Presently, the main hazard is related to strong gas emissions (CO2, H2S and Rn) from fractured zones and gas blowouts from wells reaching shallow gas-pressurized aquifers.Published279 – 2974.3. TTC - Scenari di pericolosità vulcanicareserve
Recensione di G. Colli, Platone politico, Adelphi, Milano 2007
No full textQuesto breve saggio di Giorgio Colli (1917-1979), risalente alla primavera del 1937, confluì nella tesi di laurea discussa dall’autore nel 1939. Come osserva il curatore, Enrico Colli, il Platone politico costituisce il «primo lavoro di un certo impegno» (p. 11) dello studioso destinato a diventare un grande storico della filosofia antica, nonché curatore con Mazzino Montinari dell’edizione filosofica delle opere di Friedrich Nietzsche
The impact of temporal aggregation of solid precipitation measurements on the correction for wind induced undercatch.
No full textSolid precipitation measurements are strongly affected by wind-induced errors, due to the aerodynamic response of catching type gauges. The snowflakes deviate from their undisturbed trajectories due to the alteration of the airflow field around the body of the gauge and the corresponding developed turbulence. The resulting effect consists in a certain degree of undercatch, which is a function of the undisturbed wind velocity.
Windshields have been developed to provide reference solid precipitation measurements in field test sites, e.g. the Double Fence Intercomparison Reference (DFIR), or employed in operational measurements with the aim of reducing the effect of the wind, such as the Single Alter shield (SA).
Various authors have studied wind-induced errors from different point of view (theoretical, numerical and experimental). The available data from CFD and field tests studies (Colli, 2015; Wolff,2 2015) lead to determine the Collection Efficiency (CE) of the gauges, which is a relation between the solid precipitation undercatch and the wind speed, and consequently the transfer function (TF) used to correct the wind-induced errors.
Since solid precipitation records, and the associated wind speed data, are commonly stored with a quite coarse resolution in time (60 or 30 minutes), we investigated the impact of the aggregation scale on the accuracy of snowfall data when corrected by using the transfer functions. From the WMO SPICE (Solid Precipitation Intercomparison Experiment) field campaign, we selected a number of snowfall events from the Marshall Field test site (Colorado, USA) during the winter seasons from 2013 to 2015. Three Geonor weighing gauges with different configurations (unshielded, Single Alter shielded and DFIR as the reference) recorded the snowfall rates. Both precipitation and wind speed data are quality controlled and provided with the time resolution of 1 minute.
The CE and the respective Transfer Function have been derived from the selected number of snowfall events. From the reference (DFIR) snowfall data and the wind speed values at the time resolution of 1 min, we derived synthetic sequences of wind affected snowfall rates using the derived CE curves at the coarser time resolution. The synthetic observations have been obtained both for the Unshielded and SA gauges.
Using the TF, the synthetic dataset has been corrected using different aggregation intervals (5, 15 and 30 minutes). It is observed that, by increasing the aggregation interval of both snow and wind data, the efficacy of the correction decreases, indicating that high resolution snowfall and wind measurements are essential to ensure high quality snowfall measurements
Volcanic hazard of Colli Albani.
No full textAlthough controversy exists about the age of its most recent eruption (either 36 ka or
,23 ka), Colli Albani volcano is unanimously considered to be quiescent and not exinct.
During the Holocene, several lahars were generated by overflows from Albano crater lake up to
the fourth century BCE, when the Romans excavated a drainage tunnel to keep the lake level
below the crater rim. Such recent activity, together with the frequent occurrence of seismic
swarms underneath the crater zone, the ongoing uplift of the volcanic edifice and the magmatic affinity
of the emitted gas, indicate the presence of an active magma chamber. The most likely site for a
new eruption is the deep crater hosted in the southern part of the Lake Albano, where the last eruptive
events occurred. Any eruption would have a strong explosive character enhanced by the interaction
of magma with the water of the lake and would endanger a densely inhabited area up to the
outskirts of Rome. The hazard of a new overflow from Lake Albano is very low because of the
present low level of the lake. There is instead a potential for CO2 release from the deep lake
water following the occurrence of rollovers, which would threaten the lake shore, a site where
thousands of people spend their vacations in the summer. However, the content of dissolved
CO2 is presently far from saturation and no Nyos-type events will occur today. Presently, the
main hazard is related to strong gas emissions (CO2, H2S and Rn) from fractured zones and gas
blowouts from wells reaching shallow gas-pressurized aquifers
Continuità e discontinuità nei gruppi dirigenti della grande industria privata tra fascismo e dopoguerra.
No full textIl saggio tratta dei gruppi dirigenti dell'industria privata a cavallo tra anni trenta e anni cinquanta, sottolineandone la sostanziale continuità
When PVL Appears After TAVR Pre-Existing Left Ventricle Volumetric Adaptation Makes the Difference
No full textLetter to the editor referring to https://doi.org/10.1016/j.jcin.2019.06.02
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