A closed-form solution for the failure interaction diagrams of pile groups subjected to inclined eccentric load     

Di Laora  Raffaele  Iodice  Chiara  Mandolini  Alessandro 《Acta Geotechnica》2022,17(8):3633-3646

The work at hand proposes a method for assessing, under reasonable hypotheses from an engineering perspective, the failure envelope of a pile group subjected to generalized loading conditions involving a vertical and a lateral force along with a moment. Following different assumptions of increasing complexity, a simple closed-form expression, which is however capable of considering also the strong dependence of sectional yielding moment on the axial force, is derived. The use of such formula, which allows a practical hand calculation of the interaction diagrams at failure, returns conservative yet very accurate results. As a follow up, with reference to reinforced concrete piles, design considerations involving both structural and geotechnical failure under lateral load are reported. It is found that for most cases, if steel reinforcement is established to resist the design bending moment, the geotechnical Ultimate Limit State checks are automatically satisfied.

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An analysis of intersystem biases for multi-GNSS positioning   总被引：4，自引：3，他引：1  

Andrea Dalla Torre  Alessandro Caporali 《GPS Solutions》2015,19(2):297-307

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Geochronological study of zircons from continental crust rocks in the Frido Unit (southern Apennines)     

Salvatore Laurita  Giacomo Prosser  Giovanna Rizzo  Antonio Langone  Massimo Tiepolo  Alessandro Laurita 《International Journal of Earth Sciences》2015,104(1):179-203

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Dynamical downscaling of CMIP5 global circulation models over CORDEX-Africa with COSMO-CLM: evaluation over the present climate and analysis of the added value   总被引：2，自引：1，他引：1  

Alessandro Dosio  Hans-Jürgen Panitz  Martina Schubert-Frisius  Daniel Lüthi 《Climate Dynamics》2015,44(9-10):2637-2661

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The problem of glaucony from the Shannon Sandstone (Campanian,Wyoming)     

Alessandro Amorosi 《地学学报》2011,23(2):100-107

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Short-term under-ice variability of prokaryotic plankton communities in coastal Antarctic waters (Cape Hallett, Ross Sea)     

Mauro Celussi  Alessandro Paoli  Erica Crevatin  Andrea Bergamasco  Francesca Margiotta  Vincenzo Saggiomo  Serena Fonda Umani  Paola Del Negro 《Estuarine, Coastal and Shelf Science》2009,81(4):491-500

During the 2006 Italian Antarctic expedition a diel sampling was performed close to Cape Hallett (Ross Sea) during the Austral summer. Under-ice seawater samples (4 m) were collected every 2 h for 28 h in order to estimate prokaryotic processes' variability and community structure dynamics. Prokaryotic and viral abundances, exoenzymatic activities (β-glucosidase, chitinase, lipase, alkaline phosphatase and leucine aminopeptidase), prokaryotic carbon production (³H-leucine incorporation) and community structure (Denaturing Gradient Gel Electrophoresis – DGGE fingerprints) were analysed. Results showed that the diel variability of the prokaryotic activity followed a variation in salinity, probably as a consequence of the periodical thawing of sea ice (driven by solar radiation and air temperature cycles), while negligible variation in viral and prokaryotic abundances occurred. The Bacterial and Archaeal community structures underwent an Operational Taxonomic Units (OTUs) temporal shift from the beginning to the end of the sampling, while Flavobacteria-specific primers highlighted high variations in this group possibly related to sea ice melting and substrate release.  相似文献   

First integrals for the Kepler problem with linear drag     

Alessandro Margheri  Rafael Ortega  Carlota Rebelo 《Celestial Mechanics and Dynamical Astronomy》2017,127(1):35-48

In this work we consider the Kepler problem with linear drag, and prove the existence of a continuous vector-valued first integral, obtained taking the limit as \(t\rightarrow +\infty \) of the Runge–Lenz vector. The norm of this first integral can be interpreted as an asymptotic eccentricity \(e_{\infty }\) with \(0\le e_{\infty } \le 1\). The orbits satisfying \(e_{\infty } <1\) approach the singularity by an elliptic spiral and the corresponding solutions \(x(t)=r(t)e^{i\theta (t)}\) have a norm r(t) that goes to zero like a negative exponential and an argument \(\theta (t)\) that goes to infinity like a positive exponential. In particular, the difference between consecutive times of passage through the pericenter, say \(T_{n+1} -T_n\), goes to zero as \(\frac{1}{n}\).  相似文献   

Real-time assimilation of streamflow observations into a hydrological routing model: effects of model structures and updating methods   总被引：1，自引：1，他引：0  

Maurizio Mazzoleni  Haksu Lee  Yuqiong Liu  Dong-Jun Seo  Alessandro Amaranto 《水文科学杂志》2018,63(3):386-407

This paper comparatively assesses the performance of five data assimilation techniques for three-parameter Muskingum routing with a spatially lumped or distributed model structure. The assimilation techniques used include direct insertion (DI), nudging scheme (NS), Kalman filter (KF), ensemble Kalman filter (EnKF) and asynchronous ensemble Kalman filter (AEnKF), which are applied to river reaches in Texas and Louisiana, USA. For both lumped and distributed routing, results from KF, EnKF and AEnKF are sensitive to the error specification. As expected, DI outperformed the other models in the case of lumped modelling, while in distributed routing, KF approaches, particularly AEnKF and EnKF, performed better than DI or nudging, reflecting the benefit of updating distributed states through error covariance modelling in KF approaches. The results of this work would be useful in setting up data assimilation systems that employ increasingly abundant real-time observations using distributed hydrological routing models.  相似文献   

Integrated Electrical Resistivity Tomography and Ground Penetrating Radar Measurements Applied to Tomb Detection     

Rita Deiana  Jacopo Bonetto  Alessandro Mazzariol 《Surveys in Geophysics》2018,39(6):1081-1105

The integrated use of electrical resistivity tomography (ERT) and ground penetrating radar (GPR) measurements, and in particular the joint analysis of 2D and 3D data, can represent a valid solution for target identification at complex archaeological sites. A good example, in this respect, is given by the case study of a Phoenician–Punic necropolis in the archaeological site of Nora, in southern Sardinia (Italy), where GPR and ERT measurements were collected before site excavation. In this specific case, the mix of soil and air in the buried chambers, as well as the orientation and the complex spatial distribution of these structures into the sandstone bedrock, generated a number of anomalies difficult to interpret only using 2D results. Only the integration of all GPR and ERT data in a 3D view, and the comparison with archaeological evidence after the excavation, allowed a solid interpretation of geophysical anomalies visible in the 2D sections. Overall, this case study demonstrates the efficiency of the combined use of GPR and ERT acquisitions and shows how, in general, only the joint analysis of 2D data and in a 3D view can help the interpretation of the real distribution of the buried archaeological remains at similar archaeological complex sites.  相似文献   

Spatial pattern analysis using hybrid models: an application to the Hellenic seismicity     

Marianna?SiinoEmail author  Giada?Adelfio  Jorge?Mateu  Marcello?Chiodi  Antonino?D’Alessandro 《Stochastic Environmental Research and Risk Assessment (SERRA)》2017,31(7):1633-1648

Earthquakes are one of the most destructive natural disasters and the spatial distribution of their epicentres generally shows diverse interaction structures at different spatial scales. In this paper, we use a multi-scale point pattern model to describe the main seismicity in the Hellenic area over the last 10 years. We analyze the interaction between events and the relationship with geological information of the study area, using hybrid models as proposed by Baddeley et al. (2013). In our analysis, we find two competing suitable hybrid models, one with a full parametric structure and the other one based on nonparametric kernel estimators for the spatial inhomogeneity.  相似文献