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Search Results: 1 - 10 of 190551 matches for " G. Amato "
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Silica-Encapsulated Efficient and Stable Si Quantum Dots with High Biocompatibility
Amato G
Nanoscale Research Letters , 2010,
Abstract: A facile fabrication method to produce biocompatible semiconductor Quantum Dots encapsulated in high quality and thick thermal oxide is presented. The process employs sonication of porous Si/SiO2 structures to produce flakes with dimension in the 50–200 nm range. These flakes show a coral-like SiO2 skeleton with Si nanocrystals embedded in and are suitable for functionalization with other diagnostic or therapeutic agents. Silicon is a biocompatible material, efficiently cleared from the human body. The Photoluminescence emission falls in the transparency window for living tissues and is found to be bright and stable for hours in the aggressive biological environment.
Aftershock location and P-velocity structure in the epicentral region of the 1980 Irpinia earthquake
A. Amato,G. Selvaggi
Annals of Geophysics , 1993, DOI: 10.4401/ag-4290
Crustal and deep seismicity in Italy (30 years after)
A. Amato,C. Chiarabba,G. Selvaggi
Annals of Geophysics , 1997, DOI: 10.4401/ag-3839
Abstract: The first modern studies of seismicity in Italy date back to the late 60's and early 70's. Although with a sparse seismic network available and only a few telemetered short-period stations, significant studies were carried out that outlined the main features of Italian seismicity (see, e.g., Boschi et al., 1969). Among these studies, one of the most important achievements was the reconnaissance of a Wadati-Benioff zone in Southern Tyrrhenian, described for the first time in detail in the papers of Caputo et al.(1970, 1973). Today, after three decades of more and more detailed seismological monitoring of the Italian region and tens of thousands earthquakes located since then, the knowledge of the earthquake generation processes in our country is much improved, although some of the conclusions reached in these early papers still hold. These improvements were made possible by the efforts of many institutions and seismologists who have been working hard to bring seismological research in Italy to standards of absolute quality, under the pivoting role of the Istituto Nazionale di Geofisica (ING). From the relocation of about 30000 crustal earthquakes and detailed studies on intermediate and deep shocks carried out in the last few years, we show that seismic release in peninsular Italy is only weakly related to the Africa-Eurasia convergence, but rather is best explained by the existence of two separate subduction/collision arcs (Northern Apennines and Southern Apennines-Calabria-Sicily). The width of the deforming belt running along peninsular Italy is 30 to 60 km, it is broader in the north than in the south, and the two arcs are separated by a region of more distributed deformation and stress rotations in the Central Apennines. Along the belt, the reconnaissance of regions of continuous and weak release of seismic energy, adjacent to fault areas which are currently locked (and therefore are the best candidates for future earthquakes) is another recent important achievement of the prolonged detailed seismic monitoring of our territory, which will provide in the future more and more precise indications of where earthquakes will strike. In addition, the accurate location of hundreds of intermediate and deep earthquakes beneath the two arcs has recently provided (together with seismic tomography results) new hints on the tectonic setting of Italy and its evolution over time, on the relations between deep processes and crustal stress, and ultimately on the mechanisms of earthquake generation in our country.
Gamma Rays and Neutrinos from SNR RX J1713.7-3946
G. Morlino,P. Blasi,E. Amato
Physics , 2009, DOI: 10.1016/j.astropartphys.2009.03.007
Abstract: The supernova paradigm for the origin of galactic cosmic rays can be tested using multifrequency observations of both non-thermal and thermal emission from supernova remnants. The smoking gun of hadronic acceleration in these sources can, however, only be provided by the detection of a high energy neutrino signal. Here we apply the theory of non-linear particle acceleration at supernova shocks to the case of the supernova remnant RX J1713.7-3946, which is becoming the stereotypical example of a possible hadronic accelerator after the detection of high energy gamma rays by the HESS telescope. Our aim is twofold: on one hand we want to address the uncertainties in the discrimination between a hadronic and a leptonic interpretation of the gamma ray emission, mainly related to the possibility of a statistical uncertainty in the energy determination of the gamma ray photons in the TeV region. On the other we want to stress how a km cube neutrino telescope would break the degeneracy and provide evidence for efficient cosmic ray acceleration in RX J1713.7-3946. A 3 sigma evidence would require about two years of observation.
Muon Spin Relaxation Measurements on Zirconia Samples
C. Degueldre,A. Amato,G. Bart
Physics , 2005,
Abstract: Although of primary importance in the mechanistic understanding of Zircaloy hydriding, practically nothing is known on the transport properties of hydrogen in zirconia. In this frame the muon, which can be considered as a light hydrogen nuclide, can be used as an analogue and its behavior in zirconia and Zircaloy corrosion layer may provide more insight to understand the behavior of hydrogen in these phases. Preliminary muon spin relaxation ($\mu$SR) measurements on several monoclinic zirconia samples, including a Zircaloy corrosion layer, have been performed. From the observed muon depolarization rate, the muon diffusivity in bulk monoclinic zirconia can be extracted and is found comparable to that of recently reported proton diffusivity.
Assessing water quality by remote sensing in small lakes: the case study of Monticchio lakes in southern Italy
Mancino G,Nolè A,Urbano V,Amato M
iForest : Biogeosciences and Forestry , 2009, DOI: 10.3832/ifor0507-002
Abstract: In order to investigate bio-physical parameters associated with water quality, a model based on calibrated and atmospherically corrected Remotely Sensed data has been implemented. Secchi Disk depth and chlorophyll concentration parameters were estimated in a system of very small lakes at Monticchio (Italy) using Landsat TM data. The model was developed through the use of stepwise multiple regression and gave high coefficients of determination (R2 = 0.82 for Secchi Disk and R2 = 0.72 for chlorophyll). Values for water transparency were strongly correlated with chlorophyll a concentration: a linear relationship between the two parameters showed a high coefficient of determination (R2 = 0.93). The case study shows that the application of this approach on lakes with a small surface area, such as the Monticchio lakes in Southern Italy, is effective and the developed model well describes the water quality parameters.
Critical rainfall thresholds for triggering shallow landslides in the Serchio River Valley (Tuscany, Italy)
R. Giannecchini,Y. Galanti,G. D'Amato Avanzi
Natural Hazards and Earth System Sciences (NHESS) & Discussions (NHESSD) , 2012, DOI: 10.5194/nhess-12-829-2012
Abstract: The Serchio River Valley, in north-western Tuscany, is a well-known tourism area between the Apuan Alps and the Apennines. This area is frequently hit by heavy rainfall, which often triggers shallow landslides, debris flows and debris torrents, sometimes causing damage and death. The assessment of the rainfall thresholds for the initiation of shallow landslides is very important in order to improve forecasting and to arrange efficient alarm systems. With the aim of defining the critical rainfall thresholds for the Middle Serchio River Valley, a detailed analysis of the main rainstorm events was carried out. The hourly rainfall recorded by three rain gauges in the 1935–2010 interval was analysed and compared with the occurrence of shallow landslides. The rainfall thresholds were defined in terms of mean intensity I, rainfall duration D, and normalized using the mean annual precipitation. Some attempts were also carried out to analyze the role of rainfall prior to the damaging events. Finally, the rainfall threshold curves obtained for the study area were compared with the local, regional and global curves proposed by various authors. The results of this analysis suggest that in the study area landslide activity initiation requires a higher amount of rainfall and greater intensity than elsewhere.
Finite element analysis of ground deformation due to dike intrusion with applications to Mt. Etna volcano
A. Occhipinti Amato,M. Elia,A. Bonaccorso,G. La Rosa
Annals of Geophysics , 2004, DOI: 10.4401/ag-3357
Abstract: A 2D finite elements study was carried out to analyse the effects caused by dike intrusion inside a heterogeneous medium and with a realistic topography of Mt. Etna volcano. Firstly, the method (dimension domain, elements type) was calibrated using plane strain models in elastic half-spaces; the results were compared with those obtained from analytical dislocation models. Then the effects caused both by the topographic variations and the presence of multi-layered medium on the surface, were studied. In particular, an application was then considered to Mt. Etna by taking into account the real topography and the stratification deduced from seismic tomography. In these conditions, the effects expected by the dike, employed to model the 2001 eruption under simple elastic half-space medium conditions, were computed, showing that topography is extremely important, at least in the near field.
Slope stability maps in areas of particular seismic interest: a short report on the researches in Garfagnana and Lunigiana (Tuscany)
G. D'Amato Avanzi,A. Puccinelli,M. Trivellini
Annals of Geophysics , 1993, DOI: 10.4401/ag-4313
Active and remnant subducted slabs beneath Italy: evidence from seismic tomography and seismicity
A. Amato,B. Alessandrini,G. Cimini,A. Frepoli
Annals of Geophysics , 1993, DOI: 10.4401/ag-4272
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