1,720,960 research outputs found
Considerations on the deformation of Ridracoli dam foundation based on the analysis of monitoring data
Full text linkThe behaviour of the Ridracoli arch-gravity dam in the 2002-2020 operation years has been analysed, by applying "statistical"models of increasing complexity to the time series of pendulum and long-base extensometer measurements. The modelling approach has proved robust. A satisfactory estimate of the reservoir load, thermal and irreversible drift components has been obtained for most of the instruments. As expected, the influence of temperature is lower for the instruments deeply embedded in the rock mass. The deformations recorded on the left and right bank of the dam have shown a minor influence of the anisotropic proprieties of the rock mass, well characterized by the mechanical tests performed at the time of dam construction
A strain applied method for FEM-2D modelling of TBM tunnels in coarse-grained soils with comparative analysis of case histories
No full textUn approccio integrato per la valutazione prestazionale della stabilità delle spalle di dighe ad arco
Full text linkLa nota presenta un metodo per valutare le prestazioni sismiche di cunei in roccia alle spalle di una diga ad arco, secondo un approccio agli spostamenti di tipo Newmark opportunamente modificato per includere le forze trasmesse dalla diga e tutti i possibili cinematismi tridimensionali del cuneo all’interno della nicchia di distacco. Nell'ipotesi di blocco rigido e assenza di rotazioni, il metodo è in grado di tenere conto delle tre componenti dell'input sismico, il progressivo distacco del blocco dai piani di appoggio del giunto, l'eventuale recupero del contatto e anche il temporaneo distacco completo del blocco attraverso una fase di volo libero. Oltre alle azioni inerziali gravitazionali e sismiche, sono incluse nell’analisi le forze statiche e dinamiche esercitate al contatto diga-cuneo, comprese quelle relative all'interazione inerziale con l'invaso. Il metodo viene applicato per la verifica sismica della diga ad arco-gravità di Ridracoli (Italia), fondata su una formazione rocciosa fittamente stratificata di origine turbiditica. In particolare, la spalla destra viene verificata rispetto alla formazione di cunei adagiati su piani di strato con caratteristiche di resistenza particolarmente scadenti
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
Analisi delle condizioni di stabilità della spalla destra della diga di Ridracoli alla luce degli sviluppi tecnici e normativi
No full textNel presente studio si analizza la stabilità della spalla destra della diga ad arco-gravità di Ridracoli nei con-fronti di possibili cinematismi lungo le discontinuità della roccia di fondazione. Prove di taglio in sito realizza-te durante la costruzione della diga evidenziano la presenza di alcuni livelli marnosi laminati, con parametri di resistenza particolarmente scadenti, all’interno dell’ammasso roccioso fittamente stratificato. Per consolidare l’ammasso, durante le fasi di scavo propedeutiche alla realizzazione della diga, furono posti in opera numerosi tiranti di ancoraggio.
Le analisi sono svolte secondo il metodo all’equilibrio limite tridimensionale e delineano un possibile cinemati-smo di collasso fortemente condizionato dalla direzione di spinta della diga per effetto arco. L’azione sismica è stata considerata per mezzo di analisi pseudo-statiche, a partire da uno specifico studio sismotettonico dell’area, che delinea un aumentato quadro di pericolosità sismica rispetto alla situazione progettuale
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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