3,223 research outputs found
Automatic March tests generation for static and dynamic faults in SRAMs
No full textNew memory production modern technologies introduce new classes of faults usually referred to as dynamic memory faults. Although some hand-made March tests to deal with these new faults have been published, the problem of automatically generate March tests for dynamic faults has still to be addressed, in this paper we propose a new approach to automatically generate March tests with minimal length for both static and dynamic faults. The proposed approach resorts to a formal model to represent faulty behaviors in a memory and to simplify the generation of the corresponding tests
Renewed ground uplift at Campi Flegrei caldera (Italy): New insight on magmatic processes and forecast
No full textCampi Flegrei caldera, including the extremely
urbanised city of Naples, is the most risky volcanic area
in the World. The last eruption in the area (1538) occurred
at the end of some decades of ground uplift, superimposed
to secular subsidence. During the last four decades, it
experienced a huge uplift phase, reaching about 3.5 m in
1985, when a subsidence phase started. Recent geodetic
data demonstrate that such a subsidence phase has
terminated, and a new uplift episode started in November
2004, with a low but increasing rate leading to about 0.04 m
of uplift till the end of October 2006. A new indicator, based
on the monitoring of maximum horizontal to vertical
displacement ratio with continuous GPS, indicates that
this uplift is likely to be associated with input of magmatic
fluids from a shallow magma chamber. The method is
promising to monitor magma intrusion processes, at this and
other volcanoes. Citation: Troise, C., G. De Natale, F. Pingue,PublishedL033013.6. Fisica del vulcanismo1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attiveJCR Journalreserve
Renewed ground uplift at Campi Flegrei caldera (Italy): New insight on magmatic processes and forecast
No full textCampi Flegrei caldera, including the extremely
urbanised city of Naples, is the most risky volcanic area
in the World. The last eruption in the area (1538) occurred
at the end of some decades of ground uplift, superimposed
to secular subsidence. During the last four decades, it
experienced a huge uplift phase, reaching about 3.5 m in
1985, when a subsidence phase started. Recent geodetic
data demonstrate that such a subsidence phase has
terminated, and a new uplift episode started in November
2004, with a low but increasing rate leading to about 0.04 m
of uplift till the end of October 2006. A new indicator, based
on the monitoring of maximum horizontal to vertical
displacement ratio with continuous GPS, indicates that
this uplift is likely to be associated with input of magmatic
fluids from a shallow magma chamber. The method is
promising to monitor magma intrusion processes, at this and
other volcanoes. Citation: Troise, C., G. De Natale, F. Pingue,
F. Obrizzo, P. De Martino, U. Tammaro, and E. Boschi (2007),
Renewed ground uplift at Campi Flegrei caldera (Italy): New
insight on magmatic processes and forecast, Geophys. Res. Lett.,
34, L03301, doi:10.1029/2006GL028545
A diode-laser based spectrometer for in-situ measurements of volcanic gases
No full textWe report the first results of the field operation of a novel, portable diode-laser spectrometer for gasconcentration measurements in volcanic areas. Remote detection of direct absorption line shapes was possible thanks to a telecomsingle-mode optical fiber that delivered radiation from a room-temperature distributed-feedback diode laser, emitting at 1.997 µm, to an open-path multiple-reflection cell, placed on gas effluxes. The system was deployed on two different active volcanoes in Italy, where simultaneous and continuous monitoring of CO2 and H2O concentrations has been demonstrated.Published235-240partially_ope
Unrest at Campi Flegrei Caldera (Southern Italy) during the last decade
No full textCampi Flegrei caldera is located just west of the city of
Naples, within the central-southern sector of a large graben called
Campania Plain. It is an active volcanic area marked by a quasicircular
caldera depression, probably formed by a huge
ignimbritic eruption occurred about 39000 years ago. This
caldera was generated by collapses produced by strong explosive
eruptions. The only eruption in historical times occurred in 1538building a spatter cone called Mt. Nuovo. Campi Flegrei area
periodically experiences significant deformation episodes, with
uplift phenomena reaching more than 3.5 m in 15 years (from
1970 to 1984), which caused during 1983-84 the temporary
evacuation of about 40000 people from Pozzuoli town.
The structural complexity of the Campi Flegrei area, together
with the evidence of a strong interaction between magmatic
chamber and shallow geothermal system, calls for a detailed
characterization of the substructure and of the magma-water
interaction processes.
The Campi Flegrei caldera is characterized by high volcanic
risk due to the explosivity of the eruptions and to the intense
urbanization of the surrounding area, and has been the site of
significant unrest for the past 2000 years (DE NATALE et alii,
2006). The caldera floor was raised to about 1.7 meters between
1968 and 1972; then a subsidence phase of about 0.2 m occurred
between 1972 and 1975 followed by a stable period until 1981.
Between 1982 and 1985 new uplift occurred and the caldera rose
about 1.8 m, without eruptive phenomena...Presidenza della Repubblica;Ministero dell'Ambiente e della Tutela del Territorio e del Mare;Regione Toscana;Regione Emilia Romagna;Dipartimento di Protezione Civile;ISPRA;Università di Pisa;Università di Siena;Comune di Pisa;Provincia di PisaPublishedPisa1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive4.3. TTC - Scenari di pericolosità vulcanicaope
Rome–Paris, 1950-1959: «Phases de l'Esperienza moderna», la calligraphie extrême-orientale et la poésie
No full text
- …
