1,637 research outputs found
High-density zero suppressor and encoder VME boardà using Field Programmable Gate Array
No full textHigh-density zero suppressor and encoder VME boardà using Field Programmable Gate Array
No full textNew palaeoseismological evidence of coseismic surface rupture across the Carnic Prealpine front (NE Italy): the Budoia-Aviano Thrust System
No full textIn the framework of the PRIN_2020 “Fault segmentation and seismotectonics of active thrust systems: the Northern Apennines and Southern Alps laboratories for new Seismic Hazard Assessments in northern Italy (NASA4SHA)”, we conducted a palaeoseismological study into the area comprised between the Budoia and Aviano localities (western Carnic Prealps, NE Italy). The investigated area, which is part of the external Plio-Quaternary front of the Eastern Southalpine Chain, is characterized by the presence of distinct WSW-ENE trending and S-verging reverse fault planes arranged in thrust systems and affecting the Quaternary succession (Poli et al., 2014). In detail, the geological and morphotectonic survey highlighted many evidence of recent deformation affecting the Last Glacial Maximum alluvial fan of the Artugna Stream, including morphological anomalies of both the topography (scarps) and the hydrography of minor streams. Following the multidisciplinary and multiscale approach, the preliminary geophysical survey, which included multiscale Electric Resistivity Tomograhy (DERT and ERT) and Ground Penetrating Radar (GPR), allowed us to identify the site for the excavation of two palaeoseismological trenches (Rizzo et al., this session) The excavated walls intersected a set of medium-to-high angle reverse planes verging towards the North, which displace the alluvial fan stratigraphy and also affect the soil. At about 2 m depth from topography, we identified a paleosoil dividing two alluvial fan units and affected by deformation. The radiocarbon dating of the paleosoil sample revealed an age of about 16 ky BC. The palaeoseismological analysis allowed us to estimate a cumulative slip, measured on all fault planes, of the order of at least 4.5 m. Moreover, we detected at least three seismic events, the most recent of which is possibly referable to the 1873 M 6.3 Alpago - Cansiglio earthquake (CPTI15, Rovida et al., 2022). The reverse fault planes identified within the two excavated trenches define an about 20 m wide area of surficial deformation, developed at the hanging-wall of the main S-verging thrust plane and characterized by an ENE-WSW trending. If considering the lateral extension of this deformation area, it clearly affects industrial complexes, urban centres and sensitive structures of Budoia and Aviano localities. Therefore, the paleoseismological evidence collected so far provide implication which are relevant for the seismic hazard estimation of the area, and which must be necessarily considered in the framework of the regional planning
Personalised intelligent training on the web: a multi agent approach
No full textOne of the most interesting realm among those ones brought up to success by the development of the Internet is distance learning and training. For this reason. the investigation for adeguate architectures and platforms supporting flexible and tailored training solutions is nowadays 01' great interests in the scientific community. This paper is concerned with the presentation of an original architecture for intelligent distance tutoring which make use of software agents. The way in which the knowledge is represented and stored is discussed together with the ability of our system to manage individual learning paths far different users. The rationale far using Agents is presented and the implementation of the system is discussed
GRB980923. A BURST WITH A SHORT DURATION HIGH-ENERGY COMPONENT
No full textThe prompt emission of gamma-ray bursts (GRBs) is usually well described by the Band function: two power laws (PLs) joined smoothly at a given break energy. In addition to the Band component, a few bursts (GRB941017, GRB090510, GRB090902B, and GRB090926A) show clear evidence of a distinct high-energy spectral component, which in some cases evolves independently from the prompt keV component and is well described by a PL, sometimes with a cutoff energy; this component is found to have long duration, even longer than the burst itself for all four bursts. Here we report the observation of an anomalous short duration high-energy component in GRB980923. GRB980923 is one of the brightest GRBs observed by BATSE. Its light curve is characterized by a rapid variability phase lasting similar to 40 s, followed by a smooth emission tail lasting similar to 400 s. A detailed joint analysis of BATSE (Large Area Detector and Spectroscopy Detector) and EGRET TASC data of GRB980923 reveals the presence of an anomalous keV to MeV component in the spectrum that evolves independently from the prompt keV one. This component is well described by a PL with a spectral index of -1.44 and lasts only similar to 2 s; it represents one of the three clearly separated spectral components identified in GRB980923, the other two being the keV prompt emission, well described by the Band function and the tail, well fit by a Smoothly Broken Power Law
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