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Laura Foglia  Iacopo Borsi  Steffen Mehl  Giovanna De Filippis  Massimiliano Cannata  Enric Vasquez‐Suñe  Rotman Criollo  Rudy Rossetto 《Ground water》2018,56(4):521-523

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A modal procedure for seismic analysis of non-linear base-isolated multistorey structures     

Pasquale Malangone  Massimiliano Ferraioli 《地震工程与结构动力学》1998,27(4):397-412

A modal procedure for non-linear analysis of multistorey structures with high-damping base-isolation systems was proposed. Two different isolation devices were considered in the analysis: an high-damping laminated rubber bearing and a lead-rubber bearing. Starting from deformational properties verified by tests, the isolation systems were characterized using three different analytical models (an Elastic Viscous, a Bilinear Hysteretic and a Wen's Model) with parameters depending from maximum lateral strain. After non-linear modelling of isolation and lateral-force-resisting systems, the effects of material non-linearities were considered as pseudo-forces applied to the equivalent linear system (Pseudo-Force Method) and the formally linearized equations of motion were uncoupled by the transformation defined by the complex mode shapes. The modal responses were finally obtained with an extension of Nigam–Jennings technique to non-linear and non-classically damped systems, in conjunction with an iterative technique searching for non-linear contributions satisfying equations of motion and constitutive laws. Since the properties of the isolated structure usually change with maximun lateral strain of isolation bearings, the integration of a new set of governing equations was required for each design-displacement value. The procedure proposed was described in detail and then applied for the determination of modal and total seismic responses in some real cases. At first, a very good agreement between non-linear responses obtained with the proposed mode superposition and with a direct integration method was observed. Then a comparison of results obtained with the three different analytical models of the isolation bearings was carried out. At last, the exact modal response obtained with analytical models depending from the design displacement of the isolation bearings was compared with two different approximated solutions, evaluated using mode shapes and isolation properties, respectively, calculated under simplified hypothesis.© 1998 John Wiley & Sons, Ltd.  相似文献   

Channel mobility drives a diverse stratigraphic architecture in the dryland Mojave River (California,USA)     

Alessandro Ielpi  Mathieu G.A. Lapôtre  Alvise Finotello  Massimiliano Ghinassi  Andrea D'Alpaos 《地球表面变化过程与地形》2020,45(8):1717-1731

The links between flood frequency and rates of channel migration are poorly defined in the ephemeral rivers typical of arid regions. Exploring these links in desert fluvial landscapes would augment our understanding of watershed biogeochemistry and river morphogenesis on early Earth (i.e. prior to the greening of landmasses). Accordingly, we analyse the Mojave River (California), one of the largest watercourses in the Great Basin of the western United States. We integrate discharge records with channel-migration rates derived from dynamic time-warping analysis and chronologically calibrated subsidence rates, thereby constraining the river's formative conditions. Our results reveal a slight downstream decrease in bankfull discharge on the Mojave River, rather than the downstream increase typically exhibited by perennial streams. Yet, the number of days per year during which the channel experiences bankfull or higher stages is roughly maintained along the river's length. Analysis of historical peak flood records suggests that the incidence of channel-formative events responds to modulation in watershed runoff due to the precipitation in the river's headwaters over decades to centuries. Our integrated analysis finally suggests that, while maintaining hydraulic geometries that are fully comparable with many other rivers worldwide, ephemeral desert rivers akin to the Mojave are capable of generating a surprisingly wide range of depositional geometries in the stratigraphic record. © 2020 John Wiley & Sons, Ltd.  相似文献   

Hydrological regimes in different slope environments and implications on rainfall thresholds triggering shallow landslides     

Fusco  Francesco  Bordoni  Massimiliano  Tufano  Rita  Vivaldi  Valerio  Meisina  Claudia  Valentino  Roberto  Bittelli  Marco  De Vita  Pantaleone 《Natural Hazards》2022,114(1):907-939

Natural Hazards - Assessing hazard of rainfall-induced shallow landslides represents a challenge for the risk management of urbanized areas for which the setting up of early warning systems, based...  相似文献   

Thermochronological evidence for a late Pliocene climate-induced erosion rate increase in the Alps     

Antonio Pignalosa  Massimiliano Zattin  Matteo Massironi  William Cavazza 《International Journal of Earth Sciences》2011,100(4):847-859

(U–Th)/He and fission-track analyses of apatite along deep-seated tunnels crossing high-relief mountain ranges offer the opportunity to investigate climate-tectonic forcing on topographic evolution. In this study, the thermochronologic analysis along the Simplon tunnel (western-central Alps; Italy and Switzerland) constrains in detail the mechanisms controlling the topographic evolution of the Simplon Massif. Cooling rates vary from about 10°C/Ma at about 10 Ma to about 35°C/Ma in the last 3 Ma. Such increase in cooling rates corresponds to the inception of glacial cycles in the northern hemisphere. Age patterns show correlation with faults distribution until 2 Ma, suggesting that tectonics-controlled rocks exhumed up to that age. After 2 Ma thermo-chronometric data show that the Simplon area has experienced primarily erosional exhumation. All age patterns provided are not affected by topographic effects, thus indicating that present-day topography has been carved in the last 2 Ma, most likely controlled by glacial erosion.  相似文献   

Water resources and climate change impact modelling on a daily time scale in the Peruvian Andes     

Norina Andres  Fernando Vegas Galdos  Waldo Sven Lavado Casimiro  Massimiliano Zappa 《水文科学杂志》2013,58(11):2043-2059

Abstract

Estimating water resources is important for adequate water management in the future, but suitable data are often scarce. We estimated water resources in the Vilcanota basin (Peru) for the 1998–2009 period with the semi-distributed hydrological model PREVAH using: (a) raingauge measurements; (b) satellite rainfall estimates from the TRMM Multi-satellite Precipitation Analysis (TMPA); and (c) ERA-Interim re-analysis data. Multiplicative shift and quantile mapping were applied to post-process the TMPA estimates and ERA-Interim data. This resulted in improved low-flow simulations. High-flow simulations could only be improved with quantile mapping. Furthermore, we adopted temperature and rainfall anomalies obtained from three GCMs for three future periods to make estimations of climate change impacts (Delta-change approach) on water resources. Our results show more total runoff during the rainy season from January to March, and temporary storages indicate that less water will be available in this Andean region, which has an effect on water supply, especially during dry season.

Editor Z.W. Kundzewicz; Associate editor D. Gerten  相似文献   

Swift observations of GRB 050712     

Massimiliano De Pasquale  Dirk Grupe  T. S. Poole  A. A. Breeveld  S. Zane  S. R. Rosen  M. J. Page  K. O. Mason  D. N. Burrows  H. A. Krimm  N. Gehrels  J. A. Nousek  P. W. A. Roming  S. Kobayashi  B. Zhang 《Monthly notices of the Royal Astronomical Society》2006,370(4):1859-1866

We present the results of X-ray and optical observations of GRB 050712 performed by Swift . The X-ray light curve of this burst exhibits episodes of flares in the first 1000 s, the same epoch at which the UVOT detected an optical counterpart. A shallow X-ray decay, with a decay slope of  α=−0.73  , followed and lasted ∼70 ks. This behaviour can be explained in terms of activity of the gamma-ray burst 'inner engine', with the possibility that the last flare is caused by the interaction of the ejecta with the surrounding medium.
We also find interesting spectral parameters for the X-ray emission. In particular, data suggest the presence of an intrinsic absorption in the first 1000 s, which can be explained if circumburst medium clouds lie along the line of sight.  相似文献   

The web of three-planet resonances in the outer Solar System: II. A source of orbital instability for Uranus and Neptune     

Massimiliano Guzzo 《Icarus》2006,181(2):475-485

The motion of the giant planets from Jupiter to Neptune is chaotic with Lyapunov time of approximately 10 Myr. A recent theory explains the presence of this chaos with three-planet mean-motion resonances, i.e. resonances among the orbital periods of at least three planets. We find that the distribution of these resonances with respect to the semi-major axes of all the planets is compatible with orbital instability. In particular, they overlap in a region of 10⁻³ AU with respect to the variation of the semi-major axes of Uranus and Neptune. Fictitious planetary systems with initial conditions in this region can undergo systematic variations of semi-major axes. The true Solar System is marginally in this region, and Uranus and Neptune undergo very slow systematic variations of semi-major axes with speed of order 10⁻⁴ AU/Gyr.  相似文献   

Swift and optical observations of GRB 050401     

Massimiliano De Pasquale  y P. Beardmore  S. D. Barthelmy  P. Boyd  D. N. Burrows  R. Fink  N. Gehrels  S. Kobayashi  K. O. Mason  R. McNought  J. A. Nousek  K. L. Page  D. M. Palmer  B. A. Peterson  P. A. Price  J. Rich  P. Roming  S. R. Rosen  T. Sakamoto  B. P. Schmidt  J. Tueller  A. A. Wells  S. Zane  B. Zhang  H. Ziaeepour 《Monthly notices of the Royal Astronomical Society》2006,365(3):1031-1038

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Fission-track evidence for late Oligocene and mid-Miocene activity along the North Anatolian Fault in south-western Thrace     

Massimiliano Zattin  Aral I. Okay  William Cavazza 《地学学报》2005,17(2):95-101

Apatite fission-track (FT) analyses of sandstone samples collected across the trace of the Ganos segment of the North Anatolian Fault (NAF) in south-western Thrace (Turkey) indicate that a significant structural discontinuity was in existence at least by the latest Oligocene. Such discontinuity had a complex kinematic history, as exhumation south of it occurred during the latest Oligocene and north of it during the mid-Miocene. Our data imply that early Pliocene westward propagation of the NAF in the Marmara region followed a pre-existing structural discontinuity; such discontinuity could be related to the development of the Intra-Pontide Suture, marking the terminal closure of the Intra-Pontide Ocean during the Oligocene.  相似文献