1,720,987 research outputs found
Geotechnical engineering practice and the implementation of Eurocode approach in Italy
No full textSince 2003 several efforts have been done in Italy by the Italian Government to modify Technical Standards, abandoning the conventional allowable stress approach and introducing the limit state approach, according to Eurocodes. More specifically in the paper the following aspects are discussed: a) the intrinsic incompatibility between the Eurocode approach and the Italian Legislation as far as the responsibilities of practising engineers are concerned; b) resistance of practising engineers and geologists to abandon conventional design methods together with a generalized reluctance in Italy towards continuous education programs; c) intrinsic incompatibility between EC7 (2004) and "structural" Eurocodes (more specifically EC8 (2004)). Eventually the difficulties of introducing the limit state approach in conventional education programs are discussed. © 2008 Taylor & Francis Group, London
Evaluating liquefaction potential of soils using CPT: a case study in the central Po River Plain, Italy
Full text linkThe paper provides preliminary results of a case-study of liquefaction potential assessment for the Italian alluvial area influenced by the May-June 2012 seismic event sequence. Analyses have been carried out on the basis of cone penetration tests CPT and CPTU (one of the most popular in situ tests in Italy), using the most widely used simplified methods (Youd et al., 2001; Robertson & Wride 2008, Robertson 2009; Idriss & Boulanger 2008; Moss et al. 2006). The aims of the research are to: 1) verify the applicability of the most used simplified methods for factor of safety and Liquefaction Potential Index calculation in the study area, 2) to verify the correctness of the predictions of liquefaction comparing the results with the observed liquefaction effects
Adeguamento degli argini del Fiumer Serchio: Aspetti Geotecnici
Full text linkall’epoca, dei quali non si hanno sufficienti conoscenze. Essi sono stati oggetto di numerose rotte, di cui l’ultima
avvenuta in più sezioni nel dicembre del 2009. Dopo quest’ultimo evento le Autorità competenti hanno realizzato una
campagna di indagini geotecniche allo scopo di incrementare il livello di conoscenza sulle strutture arginali.
L’articolo si propone di discutere i criteri per la progettazione di una campagna di indagine che sia efficiente sotto il
profilo economico, considerato che la lunghezza complessiva degli argini è superiore ai 30 km ed il livello di dettaglio
richiesto deve garantire un livello di conoscenza alla scala della singola sezione. Il cedimento dell’arginatura in un
breve tratto, infatti, provoca l’allagamento di aree molto ampie e aumenta la fragilità del sistema di protezione. La
campagna di indagini effettuata comprende sondaggi geotecnici, CPTu, prove di permeabilità, tomografie elettriche
bidimensionali e l’uso di un campionatore stratigrafico autoinguainante, oltre a prove di laboratorio sui campioni
prelevati.
La disponibilità di dati ha consentito di verificare l’efficacia dei metodi indiretti (CPTu, tomografie elettriche) per la
definizione del profilo stratigrafico. Sotto questo aspetto si è potuto confermare che le prove CPTu sono uno strumento
molto efficace ed efficiente se l’interpretazione è opportunamente guidata e calibrata attraverso i sondaggi geognostici.
D’altra parte le tomografie geoelettriche consentono di individuare la presenza di anomalie o eterogeneità nelle sezioni
arginali. Si sottolinea che nel caso specifico non è stato possibile estendere il campo delle tecniche utilizzabili a causa
delle ridotte dimensioni degli argini.
A valle della caratterizzazione geotecnica sono state eseguite alcune analisi allo scopo di chiarire le cause delle rotte del
2009, indirizzare la progettazione delle misure di rinforzo dei tratti coinvolti dalle rotte e individuare i tratti
maggiormente a rischio di cedimento in modo da fornire all’Amministrazione uno strumento per indirizzare e dare
priorità agli interventi
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
- …
