Search results for "fire"
showing 10 items of 463 documents
Porous structure of fibre networks formed by a foaming process: a comparative study of different characterization techniques
2016
Recent developments in making fibre materials using the foam-forming technology have raised a need to characterize the porous structure at low material density. In order to find an effective choice among all structure-characterization methods, both two-dimensional and three-dimensional techniques were used to explore the porous structure of foam-formed samples made with two different types of cellulose fibre. These techniques included X-ray microtomography, scanning electron microscopy, light microscopy, direct surface imaging using a CCD camera and mercury intrusion porosimetry. The mean pore radius for a varying type of fibre and for varying foam properties was described similarly by all …
Magmatic gas percolation through the old lava dome of El Misti volcano
2017
International audience; The proximity of the major city of Arequipa to El Misti has focused attention on the hazards posed by the active volcano. Since its last major eruption in the fifteenth century, El Misti has experienced a series of modest phreatic eruptions and fluctuating fumarolic activity. Here, we present the first measurements of the compositions of gas emitted from the lava dome in the summit crater. The gas composition is found to be fairly dry with a H2O/SO2 molar ratio of 32 ± 3, a CO2/SO2 molar ratio of 2.7 ± 0.2, a H2S/SO2 molar ratio of 0.23 ± 0.02 and a H2/SO2 molar ratio of 0.012 ± 0.002. This magmatic gas signature with minimal evidence of hydrothermal or wall rock int…
Intensity and persistence of water repellency at different soil moisture contents and depths after a forest wildfire
2022
Abstract The Mediterranean mixed coniferous and broad-leaved forest of Moarda (Palermo) was affected by a large wildfire in summer 2020. In spring 2021, burned and unburned loam soil sites were sampled and the water drop penetration time (WDPT) and ethanol percentage (EP) tests applied to assess the influence of wetting-drying processes and soil water content on post-fire soil water repellency (SWR) as well as its vertical distribution. According to the WDPT test, the surface layer of the natural unburned soils was severely hydrophobic at intermediate soil water contents roughly corresponding to wilting point and SWR reduced either for very dry conditions (air- or oven-dried conditions) or …
Conservation of Ptilostemon greuteri (Asteraceae), an endemic climate relict from Sicily (Italy): state of knowledge after the discovery of a second …
2022
Ptilostemon greuteri is one of the most endangered and poorly studied woody vascular plant species of the Mediterranean Basin, endemic to Sicily (Italy). Several peculiar traits confer to P. greuteri a character of uniqueness and an enigmatic attractiveness. In fact, at first glimpse the largest individuals of this species remind the most remarkable and peculiar cases of herbaceous genera (e.g., Echium, Senecio) turned woody on insular or insular-like mountain ecosystems. Following the discovery of a second population of this rare species, a project aiming at the study and conservation of P. greuteri was set up. We present here updated information on the distribution, conservation status, b…
Thin plastic foil X-ray optics with spiral geometry
2007
Winding a plastic foil ribbon into spiral cylinder or spiral cones we can design and build single or multiple reflection X-ray grazing incidence focusing optics with potential applications in Astronomy as well as experimental physics. The use of thin plastic foils from common industrial applications and of a mounting technique which does not require the construction of mandrels make these optics very cost effective. A spiral geometry focusing optic produces an annular image of a point source with the angular size of the annulus depending mainly on the pitch of the winding and the focal length. We use a ray-tracing code to evaluate the performances of cylindrical, and double conical spiral g…
Bayesian chronological analyses consistent with synchronous age of 12,835-12,735 Cal BP for Younger Dryas boundary on four continents
2015
The Younger Dryas impact hypothesis posits that a cosmic impact across much of the Northern Hemisphere deposited the Younger Dryas boundary (YDB) layer, containing peak abundances in a variable assemblage of proxies, including magnetic and glassy impact-related spherules, high-temperature minerals and melt glass, nanodiamonds, carbon spherules, aciniform carbon, platinum, and osmium. Bayesian chronological modeling was applied to 354 dates from 23 stratigraphic sections in 12 countries on four continents to establish a modeled YDB age range for this event of 12,835-12,735 Cal B.P. at 95% probability. This range overlaps that of a peak in extraterrestrial platinum in the Greenland Ice Sheet …
Holocene fire activity during low-natural flammability periods reveals scale-dependent cultural human-fire relationships in Europe
2018
Abstract Fire is a natural component of global biogeochemical cycles and closely related to changes in human land use. Whereas climate-fuel relationships seem to drive both global and subcontinental fire regimes, human-induced fires are prominent mainly on a local scale. Furthermore, the basic assumption that relates humans and fire regimes in terms of population densities, suggesting that few human-induced fires should occur in periods and areas of low population density, is currently debated. Here, we analyze human-fire relationships throughout the Holocene and discuss how and to what extent human-driven fires affected the landscape transformation in the Central European Lowlands (CEL). W…
Désir et monotonie dans Jane Eyre
2008
dissertation dans un ouvrage scientifique à l'intention des étudiants de concours : Laurent Bury et Dominique Sipière, éds., Jane Eyre – Le roman de Charlotte Brontë et le film de Franco Zeffirelli (Ellipses)
Twin Peaks: Fire Walk With Me (1992) and David Lynch's Aesthetics of Frustration
2010
This article focuses on Twin Peaks: Fire Walk With Me (David Lynch,1992), the prequel to the TV series produced by Mark Frost and David Lynch (1990-1991), which represents a turning point in Lynch's filmography. The author argues that the film's aesthetics frustrate viewer expectations, and especially the fan of the TV series, by addressing the issue of the film's relation to the TV series. Special attention is payed to the aesthetics of time passing and to the accumulation of unusual signs in the first part of the film, with reference to Deleuze and Michel Guiomar, and the way they lead the spectator, fan or neophyte, to expect something Fantastic to happen. The article then addresses the …
Zdzisław Filingier
2017
Pułkownik Zdzisław Filingier to postać wybitnie zasłużona dla pożarnictwa zarówno na Opolszczyźnie, jak i w całej Polsce. Pułkownik Filingier urodził się 2 stycznia 1922 roku w Warszawie. Jego rodzina mieszkała w Międzylesiu. Tam Zdzisław Filingier spędził dzieciństwo i wczesne lata młodzieńcze. W latach 1935–1939 uczęszczał do gimnazjum w Warszawie, gdzie należał do harcerstwa. W czasie pierwszych miesięcy okupacji skończył tajną podchorążówkę Armii Krajowej oraz brał udział w wielu akcjach sabotażowych. Wstąpił do oddziału 25. pułku piechoty Armii Krajowej Ziemi Piotrkowskiej, działającego na Kielecczyźnie i w Górach Świętokrzyskich. Pod pseudonimem partyzanckim „Roszak” został dowódcą pl…