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On the dynamic response of a flexible walls retaining, a dissipative drained or fluid saturated porous media
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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
Mode III crack growth in linear hardening materials with strain gradient effects
No full textThe flow-theory version of couple stress strain gradient plasticity is adopted for investigating the asymptotic fields near a steadily propagating crack-tip, under Mode III loading conditions. By incorporating a material characteristic length, typically of the order of few microns for ductile metals, the adopted constitutive model accounts for the microstructure of the material and can capture the strong size effects arising at small scales. The effects of microstructure result in a substantial increase in the singularities of the skew-symmetric stress and couple stress fields, which occurs also for a small hardening coefficient. The symmetric stress field turns out to be non-singular according to the asymptotic solution for the stationary crack problem in linear elastic couple stress materials. The performed asymptotic analysis can provide useful predictions about the increase of the traction level ahead of the crack-tip due to the sole contribution of the rotation gradient, which has been found relevant and non-negligible at the micron scale
Analytical models for the dynamic analysis of flexible cantilever diaphragm walls subjected to seismic actions
No full textNel presente lavoro vengono presentati alcuni modelli analitici sviluppati per descrivere la complessa interazione dinamica fra il terreno e una paratia incastrata alla base. A differenza dei metodi pseudostatici, suggeriti dagli Eurocodici, i modelli sviluppati consentono di tenere conto della effettiva rigidezza della paratia, delle proprietà elastiche e di permeabilità del terreno ed inoltre di simulare il comportamento dinamico dell’insieme terreno-opera di sostegno in presenza di una forzante comunque variabile nel tempo, applicando la trasformata discreta di Fourier (D.F.T.). La risposta dinamica dell’opera viene modellata con riferimento a due diversi tipi di terreno, tipici dei siti alluvionali interessati dal progetto della Idrovia Ferrarese (Lanzoni et al., 2005); l’uno di tipo limo-argilloso con bassa permeabilità per cui viene considerata una equazione costitutiva di tipo visco-elastico, l’altro per i terreni a grana grossa con elevata permeabilità per cui viene sviluppato un modello costitutivo poro-visco-elastico. Viene infine presentata la risposta del modello ad alcuni accelerogrammi registrati durante eventi sismici e, ove possibile, essa viene comparata con i risultati riportati nella letteratura tecnica
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