2,475 research outputs found
Integrated geophysical survey in a sinkhole-prone area: Microgravity, electrical resistivity tomographies, and seismic noise measurements to delimit its extension
Detection, forecasting, early warning, and effective monitoring are key aspects for the delimitation of sinkholeprone areas and for susceptibility assessment and risk mitigation. To attain these goals, direct and indirect techniques can be employed, and the integration of different indirect/non-invasive geophysical methods including 2D- and 3D-electrical resistivity tomography, microgravity, and single-station seismic noise measures
was carried out at “Il Piano” (Elba Island – Italy), where at least nine sinkholes occurred between 2008 and 2014.
The most likely origin for these sinkholes had been considered related to net erosion of sediment from the
alluvium, caused by downward water circulation between the aquifer hosted in the upper layer (Quaternary
alluvial deposits) and that in the lower (Triassic brecciated dolomitic limestone and Cretaceous slate). The
integrated geophysical survey, therefore, was carried out a) to differentiate shallower from deeper geological
layers, b) to detect possible cavities that could evolve into sinkholes, c) to suggest possible triggers, and d) to
delimit the sinkhole-prone area. The results of the integrated geophysical surveys suggest that the study area is mainly characterised by paleochannels, and that the sinkhole-prone area boundaries correspond to these paleochannels.Published282-2937SR AMBIENTE – Servizi e ricerca per la societàJCR Journa
Rapporto sull’attività 29 Giugno – 6 Luglio 2013
In questo lavoro viene descritta la campagna geofisica e idro-oceanografica ‘GARGANO2013’
effettuata grazie ad una collaborazione tra INGV e Marina Militare Italiana nell’ambito di un accordo di
collaborazione denominato CONAGEM (Coordinamento Nazionale per la Geofisica Marina). Tale accordo, siglato nel 2005 fra i principali enti pubblici di ricerca che operano in mare, prevede infatti la possibilità di attuare congiuntamente campagne di ricerca marine condividendone dati e risultati.
La campagna è stata organizzata con la finalità di raccogliere quanti più possibili elementi utili a
caratterizzare l’area marina del Gargano sotto un profilo ambientale predisponendone un quadro di
riferimento per successive attività di monitoraggio delle fenomenologie presenti nell’area di indagine. In quest’ottica, l’obiettivo prefissato era la mappatura di eventuali affioramenti di acque dolci in mare.
Contestualmente, è stata eseguita la sperimentazione di prototipi strumentali per future applicazioni a bordo nave: in particolare, sono state eseguite misure di tipo accelerometrico al fine di caratterizzare le sollecitazioni dinamiche cui sono sottoposti gli strumenti a bordonave ottenendo così utili informazioni per lo sviluppo di nuove tecnologie quali piattaforme inerziali per uso scientifico e strumentazione per prospezioni gravimetriche da utilizzare su nave
Early stage sinkhole formation in the acque albule basin of central Italy from geophysical and geochemical observations
Sinkhole occurrence along the Tyrrhenian margin of the Central Apennines is of great importance
for applied research, land management and civil protection. This study reports on GPS-altimetry
magnetic, gravity, geoelectric, seismic, and soil gas measurements of a rapidly developing sinkhole
near the Guidonia military airport. The measurements revealed an elliptical 2-m depression
elongated 220 m in the NNE-SSW direction with the minor axis of 110 m. In spring of 2013, two
vertical cavities formed in the eastern and northeastern flanks of the depression whose depths and
shapes are rapidly evolving with the formation of widespread fracturing along the same side. The
geophysical observations image the developing sinkhole to a depth of some 50 m, the presence of
the Travertino lithotype around the depression (down to at least 40 m), and the lack of this lithotype
below the lowered area. The sinkhole's evolution appears to be structurally controlled by local and
regional faulting. These results are useful for designing further geophysical, geotechnical and
geochemical studies to monitor the sinkhole's evolution and to assess the hazard it presents in
densely urbanized area.Published36-477A. Geofisica di esplorazioneJCR Journalreserve
On the asymptotic behaviour of solutions to the fractional porous medium equation with variable density
We are concerned with the long time behaviour of solutions to the fractional
porous medium equation with a variable spatial density. We prove that if the
density decays slowly at infinity, then the solution approaches the
Barenblatt-type solution of a proper singular fractional problem. If, on the
contrary, the density decays rapidly at infinity, we show that the minimal
solution multiplied by a suitable power of the time variable converges to the
minimal solution of a certain fractional sublinear elliptic equation.Comment: To appear in DCDS-
Hard spectra and QCD matter: experimental review
The most significant experimental results on hadron spectra at large
transverse momentum available at the time of Quark Matter 2004 conference are
reviewed. Emphasis is put on those measurements that provide insights on the
properties of the QCD media, ``Quark Gluon Plasma'' and ``Color Glass
Condensate'', expected to be present in nucleus-nucleus collisions at collider
energies.Comment: 2 plots updated. Minor changes in tex
Hadron attenuation in deep inelastic lepton-nucleus scattering
We present a detailed theoretical investigation of hadron attenuation in deep
inelastic scattering (DIS) off complex nuclei in the kinematic regime of the
HERMES experiment. The analysis is carried out in the framework of a
probabilistic coupled-channel transport model based on the
Boltzmann-Uehling-Uhlenbeck (BUU) equation, which allows for a treatment of the
final-state interactions (FSI) beyond simple absorption mechanisms.
Furthermore, our event-by-event simulations account for the kinematic cuts of
the experiments as well as the geometrical acceptance of the detectors. We
calculate the multiplicity ratios of charged hadrons for various nuclear
targets relative to deuterium as a function of the photon energy nu, the hadron
energy fraction z_h=E_h/nu and the transverse momentum p_T. We also confront
our model results on double-hadron attenuation with recent experimental data.
Separately, we compare the attenuation of identified hadrons (pi^\pm, \pi^0,
K^\pm, p and pbar) on Ne and Kr targets with the data from the HERMES
Collaboration and make predictions for a Xe target. At the end we turn towards
hadron attenuation on Cu nuclei at EMC energies. Our studies demonstrate that
(pre-)hadronic final-state interactions play a dominant role in the kinematic
regime of the HERMES experiment while our present approach overestimates the
attenuation at EMC energies.Comment: 61 pages, 19 figures, version accepted for publication in Phys. Rev.
Rapporto sull’attività 29 Giugno – 6 Luglio 2013
In questo lavoro viene descritta la campagna geofisica e idro-oceanografica ‘GARGANO2013’
effettuata grazie ad una collaborazione tra INGV e Marina Militare Italiana nell’ambito di un accordo di
collaborazione denominato CONAGEM (Coordinamento Nazionale per la Geofisica Marina). Tale accordo, siglato nel 2005 fra i principali enti pubblici di ricerca che operano in mare, prevede infatti la possibilità di attuare congiuntamente campagne di ricerca marine condividendone dati e risultati.
La campagna è stata organizzata con la finalità di raccogliere quanti più possibili elementi utili a
caratterizzare l’area marina del Gargano sotto un profilo ambientale predisponendone un quadro di
riferimento per successive attività di monitoraggio delle fenomenologie presenti nell’area di indagine. In quest’ottica, l’obiettivo prefissato era la mappatura di eventuali affioramenti di acque dolci in mare.
Contestualmente, è stata eseguita la sperimentazione di prototipi strumentali per future applicazioni a bordo nave: in particolare, sono state eseguite misure di tipo accelerometrico al fine di caratterizzare le sollecitazioni dinamiche cui sono sottoposti gli strumenti a bordonave ottenendo così utili informazioni per lo sviluppo di nuove tecnologie quali piattaforme inerziali per uso scientifico e strumentazione per prospezioni gravimetriche da utilizzare su nave.Marina Militare ItalianaPublished1-283A. Ambiente MarinoN/A or not JCRope
Global compactness results for nonlocal problems
International audienceWe obtain a Struwe type global compactness result for a class of nonlinear nonlocal problems involving the fractional Laplacian operator and nonlinearities at critical growth
INFN What Next: Ultra-relativistic Heavy-Ion Collisions
This document was prepared by the community that is active in Italy, within
INFN (Istituto Nazionale di Fisica Nucleare), in the field of
ultra-relativistic heavy-ion collisions. The experimental study of the phase
diagram of strongly-interacting matter and of the Quark-Gluon Plasma (QGP)
deconfined state will proceed, in the next 10-15 years, along two directions:
the high-energy regime at RHIC and at the LHC, and the low-energy regime at
FAIR, NICA, SPS and RHIC. The Italian community is strongly involved in the
present and future programme of the ALICE experiment, the upgrade of which will
open, in the 2020s, a new phase of high-precision characterisation of the QGP
properties at the LHC. As a complement of this main activity, there is a
growing interest in a possible future experiment at the SPS, which would target
the search for the onset of deconfinement using dimuon measurements. On a
longer timescale, the community looks with interest at the ongoing studies and
discussions on a possible fixed-target programme using the LHC ion beams and on
the Future Circular Collider.Comment: 99 pages, 56 figure
Indagini Geofisiche
Nell'ambito del progetto per la Microzonazione sismica dell'area aquilana, coordinata dal DPC, il Gruppo di Lavoro ha condotto le indagini di MS nella Conca di Roio.Published336-3854T. Sismologia, geofisica e geologia per l'ingegneria sismic
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