39,720 research outputs found
Role of numerical model and parameter variability on seismic response of slopes: the case of Las Colinas landslide
No full textThis paper presents the results of a sensitivity analysis on the influence of the strength, stiffness and damping parameters of the soil on the seismic response of a real slope. The analyses have been performed for the Las Colinas slope (El Salvador) using the finite element code PLAXIS and the data available in the literature. Las Colinas landslide was a destructive event which was triggered by the El Salvador earthquake on 13 January 2001. During this event, 183˙500 m3 of volcanic deposit slid and struck the houses on the foothill, killing 500 people. In this study a sensitivity analysis was performed to highlight the influence of the parameter uncertainties on the seismic response of the slope.
The sensitivity analyses on the stiffness and strength parameters of the soil were performed by using their low, best and high estimates, using reported data and empirical equations. The sensitivity studies on the damping factor showed an unexpectedly large influence on the results. For a better understanding of this issue, the role of damping in each layer on the total response was examined separately. In addition, the effects of mesh and model sizes, as well as performance of different boundary conditions were investigated.
The results show that, while a suitable numerical tool is in general capable of predicting and simulating the seismic response and failure of a complex slope, it is essential to undertake a careful evaluation of the mechanical parameters and modelling features. The results also show that for a realistic assessment of the uncertainties of the response it is important to identify the parameters that have the largest influence on the total response
Letter from Carl Hayden to F. R. Goodman, County Engineer
No full textLetter from Carl Hayden to F. R. Goodman regarding the construction of new roads
Aeroacoustic source characterization technique applied to a cylindrical Helmholtz resonator
No full textLetter from Carl Hayden to F. R. Goodman
No full textLetter from Carl T. Hayden to F. R. Goodman concerning the purchase of Bright Angel Trail and construction of an approach road to the park
Letter from F. R. Goodman to Carl Hayden
No full textLetter from F. R. Goodman to Carl T. Hayden asking for clarification about the agreement to construct an approach road to the par
Erratum to: Effect of moderate red wine intake on cardiac prognosis after recent acute myocardial infarction of subjects with Type 2 diabetes mellitus (Diabetic Medicine, (2006), 23, 9, (974-981), 10.1111/j.1464-5491.2006.01886.x)
No full textIn an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola.In an article by Marfella et al, the author name C. Saron is incorrect and should be listed as C. Sardu. Therefore the correct author list is: R. Marfella, F. Cacciapuoti, M. Siniscalchi, F. C. Sasso, F. Marchese, F. Cinone, E. Musacchio, M. A. Marfella, L. Ruggiero, G. Chiorazzo, D. Liberti, G. Chiorazzo, G. F. Nicoletti, C. Sardu, F. D'Andrea, C. Ammendola, M. Verza and L. Coppola
[C^N]‐Alkenyl Gold(III) Complexes by Proximal Ring‐Opening of (2‐Pyridyl)alkylidenecyclopropanes: Mechanistic Insights
No full textThis is the peer reviewed version of the following article: J. A. González, F. Verdugo, J. L. Mascareñas, F. López, C. Nevado, Angew. Chem. Int. Ed. 2020, 59, 20049, which has been published in final form at https://doi.org/10.1002/anie.202007371. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.Pyridine‐substituted alkylidenecyclopropanes (Py‐ACPs) react with gold(III) salts under mild reaction conditions through an unprecedented, proximal ring‐opening pathway, to generate highly appealing, catalytically active pyridine alkenyl [C^N]‐gold(III) species. Mechanistic studies reveal that the activation of the C−C bond of the ACP takes place through an unusual concerted, σ‐bond metathesis type‐processWe thank the European Research Council (ERC Starting grant agreement no. 307948, and Advanced Grant 340055), the Swiss National Science Foundation (SNF 200020_146853), the Legerlotz Stiftung the MINECO (SAF2016‐76689‐R, CTQ2017‐84767‐P), the Xunta de Galicia (2015‐CP082, ED431C 2017/19, and Centro singular de investigación de Galicia accreditation 2019–2022, ED431G 2019/03) and the European Union (European Regional Development Fund—ERDF) for financial support and the STSM Grant to F. Verdugo from COST Action CA15106S
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