614 research outputs found
Numerical analysis of a geo-tube subjected to seismic soil liquefaction
No full textGeo-tubes are geosynthetic tubular containers, of various length and diameter,
which are filled by pumping a fluid mixture of water and soil: the permeability of the
geosynthetic allows water to drain rapidly so that at the end of the installation a solid nucleus is
obtained. Considering that geo-tubes have been widely used as submerged elements, for example
for shoreline protection, and that the filling material is a low density loose soil, hydraulically
deposited, they may be subjected to liquefaction during seismic events. In order to investigate
the behavior of a single submerged geo-tube when subjected to soil liquefaction, a numerical
analysis is presented. The El Centro earthquake was considered and, under this solicitation, a
rapid buildup of the pore pressure in the filling soil was observed. Consequently, since the first
seconds of the seismic event, a decrease of the effective vertical stress took place up to values
close to zero, showing the capability of the model to replicate a condition of soil liquefaction. At
this stage, a general increase of the tensile force in the geosynthetic was noted, up to values that
are significantly higher than those experienced in the static phase
Caratterizzazione delle prestazioni di motori a ciclo Diesel ad iniezione diretta ed indiretta
No full textQA/QC Procedures for in-Situ Calibration of a High Altitude Automatic Weather Station: The Case Study of the AWS Pyramid, 5050 m asl, Khumbu Valley, Nepal
No full textRifugi montani sentinelle del clima e dell'ambiente : Un progetto CAI - CNR che si estende dalle Alpi al Mediterraneo
No full textNasce una Rete di Rifugi CAI e di Osservatori CNR che percorre tutta la penisola con lo scopo di mettere a sistema infrastrutture già esistenti in aree praticamente incontaminate al fine di ottenere un quadro reale ed aggiornato sullo stato del clima e dell’ambiente sulle nostre montagne.Mountain refuges sentinels of the climate and the environment - A CAI (Italian Alpine Club) - CNR (National Research Council) project that extends from the Alps to the Mediterranean
A network of CAI Refuges and CNR Observatories is born that runs throughout the peninsula with the aim of setting up existing infrastructures in practically uncontaminated areas in order to obtain a real and upda- ted reference of the state of the climate and the environment in our mountains
SURFACE ENERGY BUDGET AND MELT AMOUNT FOR THE YEARS 2009 AND 2010 AT THE FORNI GLACIER (ITALIAN ALPS, LOMBARDY)
No full textThis paper reports the surface energy budget and the melt amount
evaluated at one location at the Forni Glacier (Italian Alps, Lombardy)
during the years 2009 and 2010. The analysis was supported by high resolution
meteorology and energy data collected by an Automatic Weather
Station (named AWS1 Forni) which has been running at the glacier surface
(2669 m, ellipsoidal elevation) since 26 September 2005. The AWS is
also equipped with a sonic ranger to measure snow depth and its variability.
It resulted that in the years 2009 and 2010 the glacier melt at about
2700 m of altitude was equal to –11.32 m w.e.; these results were confirmed
by comparisons with field ablation data collected nearby the AWS
during the summer season 2009 and 2010
SHARE-Asia Automatic Weather Station Network: an integral component for climate research in the Karakorum - Himalayas region
No full textI rifugi, le nostre sentinelle
No full textNasce una rete di Rifugi Cai e di Osservatori Cnr che percorre tutta la penisola al fine di ottenere un quadro reale e aggiornato sullo stato del clima e dell’ambiente sulle nostre montagne
Influence of open vegetation fires on black carbon and ozone variability in the southern Himalayas (NCO-P, 5079 m a.s.l.)
No full textAbstractWe analysed the variability of equivalent black carbon (BC) and ozone (O3) at the global WMO/GAW station Nepal Climate Observatory-Pyramid (NCO-P, 5079 m a.s.l.) in the southern Himalayas, for evaluating the possible contribution of open vegetation fires to the variability of these short-lived climate forcers/pollutants (SLCF/SLCP) in the Himalayan region.We found that 162 days (9% of the data-set) were characterised by acute pollution events with enhanced BC and O3 in respect to the climatological values. By using satellite observations (MODIS fire products and the USGS Land Use Cover Characterization) and air mass back-trajectories, we deduced that 56% of these events were likely to be affected by emissions from open fires along the Himalayas foothills, the Indian Subcontinent and the Northern Indo-Gangetic Plain.These results suggest that open fire emissions are likely to play an important role in modulating seasonal and inter-annual BC and O3 variability over south Himalayas
Valore predittivo del test eco-dobutammina nell’identificazione del miocardio vitale dopo infarto miocardico nel paziente anziano. Nostri dati preliminari
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