Non-life insurance consumption in Italy: a sub-regional panel data analysis   总被引：1，自引：0，他引：1  

Giovanni Millo  Gaetano Carmeci 《Journal of Geographical Systems》2011,13(3):273-298

We analyze the consumption of non-life insurance across 103 Italian provinces in 1998–2002 in order to assess its determinants, in the light of the empirical literature. Using sub-regional data, we overcome an important limitation of cross-country analyses, i.e. the systemic heterogeneity due to country-specific characteristics. Individual heterogeneity is accounted for through panel data techniques. However, considering spatial units within a single market raises issues of cross-sectional or spatial dependence, either due to common nationwide and/or regional factors or to spatial proximity. We carefully assess spatial dependence, employing recent diagnostic tests, finding out that the regressors included in our specification successfully account for spatial dependence. Insurance turns out to depend on income, wealth and some demographics, as already established, but also on trust, judicial efficiency and borrowing conditions. These findings help in explaining the gap between Central-Northern Italy and the south of the country.  相似文献   

Numerical prediction of tunnel performance during centrifuge dynamic tests   总被引：2，自引：1，他引：1  

Angelo Amorosi  Daniela Boldini  Gaetano Falcone 《Acta Geotechnica》2014,9(4):581-596

In this paper, a comparison between numerical analyses and centrifuge test results relative to the seismic performance of a circular tunnel is provided. The considered experimental data refer to two centrifuge tests performed at Cambridge University, aimed at investigating the transverse dynamic behaviour of a relatively shallow tunnel located in a sand deposit. For the same geometry, different soil relative densities characterise the two tests. The four seismic actions considered, of the pseudo-harmonic type, are characterised by increasing intensity. The 2D numerical analyses were performed adopting an advanced soil constitutive model implemented in a commercial finite element code. The comparison between numerical simulations and measurements is presented in terms of acceleration histories and Fourier spectra as well as of profiles of maximum acceleration along free-field and near-tunnel verticals. In addition, loading histories of normal stress and bending moments acting in the tunnel lining were considered. In general, very good agreement was found with reference to the ground response analyses, while a less satisfactory comparison between observed and predicted results was obtained for the transient and permanent loadings acting in the lining, as discussed in the final part of the paper.  相似文献   

Atmospheric Background Measurement in the 300–400 nm Band with a Balloon Borne Experiment During a Nocturnal Flight     

Giovanni La Rosa  Gaetano Agnetta  Benedetto Biondo  Osvaldo Catalano  Filippo Celi  Renato Di Raffaele  Salvatore Giarrusso  Angelo Mangano  Francesco Russo  John Linsley  Angelo Lo Bue 《Astrophysics and Space Science》2001,276(1):219-226

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L’Istituto vulcanologicom l’ Osservatorio etneo e l’attività scientifica del personale     

Gaetano Ponte 《Bulletin of Volcanology》1937,2(1):201-204

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Geomorphology and tectonics of uplifted coasts: New chronostratigraphical constraints for the Quaternary evolution of Tyrrhenian North Calabria (southern Italy)   总被引：1，自引：0，他引：1  

F. Filocamo  P. Romano  V. Di Donato  P. Esposito  M. Mattei  M. Porreca  G. Robustelli  E. Russo Ermolli 《Geomorphology》2009,105(3-4):334-354

The Tyrrhenian coastal sector of North Calabria, stretching between Torre S. Nicola and the Lao river, belongs to the inner extensional sector of the Neogene Apennines thrust belt. It is characterised by a stair of Quaternary marine and fluvial terraces representing the geomorphic response to the interaction between the Quaternary sea level fluctuations and the regional trend of tectonic uplift experienced by the margins of the Tyrrhenian back-arc basin. Since the last century, several authors studied the North Calabria coasts, where the flight of terraces preserves significant marine and continental successions, and proposed several paleo-geomorphological and tectonic reconstructions. In this paper we present a new stratigraphic and morphostructural setting of the North Calabria coasts based on both chronostratigraphical constraints obtained from marine deposits and detailed geomorphological analysis. A ten order stair of marine terraces, stepping between 240 and 0 m a.s.l., was recognized and time-constrained by the age of the Fornaci S. Nicola marine succession which was ascribed by integrated paleoecological, biostratigraphical and paleomagentic analyses to the early Middle Pleistocene (MIS 19–15). In particular, the 240, 200 and 160 m a.s.l. high strandlines were ascribed to the Early Pleistocene and the ones between 100 and 15 m a.s.l. to the Middle Pleistocene. The total amount of the vertical motion experienced by the studied area was estimated, and evaluation of the average rates of uplift for the Middle and Late Pleistocene times were also given. Considering the elevation a.s.l. of the oldest terraces, a tectonic uplift of at least 240 m was calculated for the North Calabria coasts since the Early Pleistocene times, 100 m of which gained from the beginning of the Middle Pleistocene. On the other hand, the 8-m high Late Pleistocene strandlines display a negligible vertical displacement affecting the area during the last 130 ka. The entire staircase of terraces preserves a record of slowing down in the rate of uplift, which attained an average value of 0.15 mm/year during the Middle Pleistocene.  相似文献   

Parametric study on seismic ground response by finite element modelling     

Angelo Amorosi  Daniela Boldini  Gaetano Elia 《Computers and Geotechnics》2010

In this paper the results of 2D FE analyses of the seismic ground response of a clayey deposit, performed adopting linear visco-elastic and visco-elasto-plastic constitutive models, are presented. The viscous and linear elastic parameters are selected according to a novel calibration strategy, leading to FE results comparable to those obtained by 1D equivalent-linear visco-elastic frequency-domain analyses. The influence of plasticity on the numerical results is also investigated, with particular reference to the relation between the hysteretic and viscous damping effects. Finally, different boundary conditions, spatial discretisation and time integration parameters are considered and their role on the FE results discussed.  相似文献   

Magnetic Field Line Transport in Anisotropic Magnetic Turbulence: Anomalous, Quasilinear, and Percolative Regimes Versus the Kubo Number     

Gaetano Zimbardo  Pierluigi Veltri  Pierre Pommois 《Astrophysics and Space Science》2001,277(1-2):101-102

The transport of plasma and of energetic particles because of magnetic turbulence is relevant to many space plasmas, ranging from the planetary magnetospheres to the solar corona and to the heliosphere. Various transport regimes for magnetic field lines can be obtained depending on the Kubo number. Here we show, by means of a numerical simulation, that the Kubo number also determines the level of chaos of the field lines. Weak chaos, closed magnetic surfaces, and anomalous transport regimes are obtained for R≪ 1; widespread chaos, destroyed magnetic surfaces, and quasilinear scaling of the diffusion coefficient for R ≳ 0.3; and global stochasticity as well as percolation scaling of the diffusion coefficient for R≫ 1. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Cumulative demand of the earthquake ground motions in the near source     

Gaetano Manfredi  Maria Polese  Edoardo Cosenza 《地震工程与结构动力学》2003,32(12):1853-1865

In this paper the effects of near‐fault earthquakes are investigated through the study of parameters related to both input energy and plastic cycles demand. Based on the results of two different regression analyses performed with 128 near‐fault and 122 far‐field registrations, respectively, the Cosenza and Manfredi adimensional Id index was found to be the best seismological parameter correlated to the number n and amplitude m of plastic cycles in the vicinity of the source as well as far from it. Analytical formulations for n,m and for the equivalent number of plastic cycles neq are proposed for near‐fault and far‐field regions. The study of Id and neq shows the tendency of such parameters to increase as the distance increases. Copyright © 2003 John Wiley & Sons, Ltd.  相似文献   

Ability of soil bacterial composition as an indicator of levels of soil erosion in a badland     

Gaetano Guida  Vincenzo Palmeri  Luca Settanni  Raimondo Gaglio  Marco Tolone  Vito Ferro 《国际泥沙研究》2022,37(4):493-504

Calanchi(plural of calanco) are typical Italian badlands created by a combination of morphogenetic processes(rill and interrill erosion, gullying, piping, and mass movements) mainly originated by the effect of water. Calanchi are characterized by the sparse and patchy distribution of vegetation, and, in interplant areas, the soil surface is colonized by an association of organisms known as biological soil crust(BSC). A morphometric analysis of 45 basins in the studied calanchi area, based on a h...  相似文献   

Performance evaluation of a shallow foundation built on structured clays under seismic loading     

Gaetano Elia  Mohamed Rouainia 《Bulletin of Earthquake Engineering》2014,12(4):1537-1561

Due to the increased need of storage, larger and higher structures are being built all over the world, thus requiring a more careful evaluation of the mechanical performance of their foundation deposits both in terms of bearing capacity and compressibility behaviour. The design of such structures and their serviceability and stability is largely governed by the effects of the dynamic loading conditions principally because of their significantly elevated risk in seismic prone zones. In this paper, numerical analyses using an advanced constitutive model, able to account for the initial soil structure and its progressive degradation, have been performed to investigate the seismic response of a silo foundation built on structured clays. The proposed analyses involve the use of a fully-coupled finite element approach. For the dynamic simulations, three different input motions have been selected form earthquake databases according to the seismic hazard study of the specific site. The results of the silo dynamic response are illustrated in terms of signal amplification, permanent excess pore water pressures, accumulated displacements and structure induced degradation during and after the seismic loading. The dynamic behaviour of the footing indicates that extreme earthquake events can induce large destructuration in natural clays, leading to ground settlements up to twice the observed ones under static loads, which need to be properly accounted for in the design. This suggests that there are significant advantages in using advanced models which recognise the existence of initial soil structure and its subsequent damage due to the applied dynamic loads.  相似文献