Search results for "CRA"

Dewey, Hippie Communes, and Education

2021

Este artículo establece una conexión relevante entre la filosofía de la educación de John Dewey y las comunas hippies de los Estados Unidos durante los años sesenta y setenta. Después de analizar la filosofía de Dewey en el contexto de la contracultura de los años sesenta, el artículo resume y organiza la filosofía de Dewey en torno a los conceptos de crecimiento, experiencia, educación, democracia y ocupaciones. A continuación, el artículo recurre a siete textos autobiográficos que describen la vida en cinco comunas hippies diferentes, y los utiliza para ilustrar los fundamentos de la filosofía educativa de Dewey y de su significado contemporáneo. HAR2017-85230-R In this article I aim to e…

Micropolíticas del habla: feminismos, discursos y experiencias de práctica radiofónica en la sociedad red

2017

Esta investigación tiene como objetivo llevar a cabo una reflexión crítica hacia las relaciones de poder desiguales que atraviesan la producción de conocimientos en las sociedades occidentales contemporáneas y que históricamente han sido marcadas por ejes como el género, el sexo, la clase social o la raza y por divisiones geopolíticas de los territorios. Son relaciones que subyacen la producción y circulación de discursos y la constitución de las subjetividades. Esta es una propuesta que nos permita pensar sobre el papel de los medios de comunicación en dicha producción y de cómo podemos imaginar alternativas a los medios generalistas que partan de una crítica radical hacia el sistema capit…

Speciale CRA: on line “LE ETICHETTE ALIMENTARI”

2013

Speciale CRA: on line “LE ETICHETTE ALIMENTARI”

Sesquiterpene lactones from Anthemis wiedemanniana

2005

Asteraceae; Anthemis wiedemanniana; sesquiterpene lactones; germacranolides; eudesmanolide

2017

Abstract. Remote sensing of the gaseous composition of non-eruptive, passively degassing volcanic plumes can be a tool to gain insight into volcano interior processes. Here, we report on a field study in September 2015 that demonstrates the feasibility of remotely measuring the volcanic enhancements of carbon dioxide (CO2), hydrogen fluoride (HF), hydrogen chloride (HCl), sulfur dioxide (SO2), and bromine monoxide (BrO) in the downwind plume of Mt. Etna using portable and rugged spectroscopic instrumentation. To this end, we operated the Fourier transform spectrometer EM27/SUN for the shortwave-infrared (SWIR) spectral range together with a co-mounted UV spectrometer on a mobile platform in…

The fumarolic CO2 output from Pico do Fogo volcano (Cape Verde)

2020

The Pico do Fogo volcano, in the Cape Verde Archipelago off the western coasts of Africa, has been the most active volcano in the Macaronesia region in the Central Atlantic, with at least 27 eruptions during the last 500 years. Between eruptions fumarolic activity has been persisting in its summit crater, but limited information exists for the chemistry and output of these gas emissions. Here, we use the results acquired during a field survey in February 2019 to quantify the quiescent summit fumaroles' volatile output for the first time. By combining measurements of the fumarole compositions (using both a portable Multi-GAS and direct sampling of the hottest fumarole) and of the SO2 flux (u…

Terminal Strombolian activity at Etna’s central craters during summer 2012: The most CO<sub>2</sub>-rich volcanic gas ever recorded at Mo…

2016

Spatially resolved SO2 flux emissions from Mt Etna

2016

We report on a systematic record of SO2 flux emissions from individual vents of Etna volcano (Sicily), which we obtained using a permanent UV camera network. Observations were carried out in summer 2014, a period encompassing two eruptive episodes of the New South East Crater (NSEC) and a fissure-fed eruption in the upper Valle del Bove. We demonstrate that our vent-resolved SO2 flux time series allow capturing shifts in activity from one vent to another and contribute to our understanding of Etna's shallow plumbing system structure. We find that the fissure eruption contributed ~50,000 t of SO2 or ~30% of the SO2 emitted by the volcano during the 5 July to 10 August eruptive interval. Acti…

Hydrothermal buffering of the SO2/H2S ratio in volcanic gases: Evidence from La Fossa Crater fumarolic field, Vulcano Island

2006

[1] Sulfur speciation in volcanic gases is a potentially valuable tracer of degassing processes at volcanoes. Hitherto, observations of sulfur speciation in volcanic gas plumes have however been limited both in number and quality. Here, we report on periodic measurements of SO2 to H2S proportions in the volcanic gases from La Fossa volcano (Vulcano Island) performed during 2004–2006, a period which encompasses two heating events of the fumarolic field in January–April 2005 and December 2005. Results indicate a systematic relative increase (by a factor of 2–6) of SO2 to H2S proportions in the fumaroles during the heating events, which we ascribe to a temperature increase in the mixing zone b…

Chemical mapping of a fumarolic field: La Fossa Crater, Vulcano Island (Aeolian Islands, Italy)

2005

[1] The performance of a newly-developed portable gas analyzer, capable of real-time measurement of CO2, SO2 and H2S concentrations in volcanic gases, was tested at La Fossa Crater, Vulcano Island. The gas analyzer was used to acquire about 3000 determinations over the fumarolic field, allowing the definition of its chemical structure and heterogeneity. Our high-resolution analysis reveals that, in December 2004, the La Fossa fumarolic field was characterized by an oxidized inner core (SO2/H2S ratios of ∼3), and by more reducing conditions on its northern edge (SO2/H2S ratios of ∼1; range: 0.2–3.3). CO2/(SO2+H2S) molar ratios averaged 35 ± 21, with overlapping compositions for rim and inner…