1,720,983 research outputs found
The mechanics of mudslide as a cyclic undrained-drained process.
No full textData collected by monitoring suggest that the movement of mudslides essentially develops through alternating stages of undrained–drained deformation. Undrained conditions are established as a consequence of landslide mobilisation or reactivation. Every acceleration phase is followed by progressive deceleration associated with dissipation of excess pore pressure. This paper reports the results of some simple numerical analyses performed to investigate the role of pore pressure on mudslide behaviour
The mechanics of mudslide as a cyclic undrained-drained process.
No full textData collected by monitoring suggest that the movement of mudslides essentially develops through alternating stages of undrained–drained deformation. Undrained conditions are established as a consequence of landslide mobilisation or reactivation. Every acceleration phase is followed by progressive deceleration associated with dissipation of excess pore pressure. This paper reports the results of some simple numerical analyses performed to investigate the role of pore pressure on mudslide behaviour
The mechanics of mudslide as a cyclic undrained-drained process.
No full textData collected by monitoring suggest that the movement of mudslides essentially develops through alternating stages of undrained–drained deformation. Undrained conditions are established as a consequence of landslide mobilisation or reactivation. Every acceleration phase is followed by progressive deceleration associated with dissipation of excess pore pressure. This paper reports the results of some simple numerical analyses performed to investigate the role of pore pressure on mudslide behaviour
Main features of mudslides in tectonised highly fissured clays
No full textMudslides are widespread in the world, especially in areas occupied by highly-fissured plastic stiff clays. Despite their strong impact on structures, infrastructures and, in general, human activity, the knowledge concerning the causes and mechanisms of mudslides is still rather limited. The paper reports some results of long-term research on mudslides in tectonised highly-fissured plastic clay shales carried out through laboratory and in situ tests, monitoring and numerical analyses
Evapotranspiration estimate in a clayey slope affected by landslide phenomena
No full textThe evapotranspiration process is a key ingredient in the overall soil surface hydrological balance and therefore should be carefully evaluated in any geotechnical problem that is markedly affected by weather conditions, such as the slope stability. This issue was investigated with reference to the clayey slope underlying the town of Orvieto in Central Italy. The site has been monitored since more than 30 years with piezometers and inclinometers and a clear correspondence between movement characteristics and pore pressure variations, and indeed rainfall events, was observed at different locations and depths. In order to better estimate the rainfall quantity that effectively infiltrates in the slope, thus affecting the pore pressure regime, a study was conducted to evaluate the reference evapotranspiration ET0 at the investigated site. In order to assess the reliability of the temperature-based estimate of ET0 through the Penman-Monteith equation suggested by FAO, at a nearby meteorological station values estimated through the FAO procedure were compared to those obtained by a more refined estimate that utilizes measured meteorological data. In addition, the calculation of solar radiation was refined by introducing the effects of slope gradient and orientation as well as those of the shadowing produced by the rock cliff overlooking the clay slope. It was found that the temperature-based FAO estimate of ET0 is significantly larger than that calculated with a wide set of measured parameters. Finally, a repercussion of the different ET0 estimates on the infiltration process was investigated with reference to the water content available in the shallower part of the slope. Calculations, conducted through a simplified approach, indicated that in this specific application the difference in ET0 calculation plays a negligible role
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
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