1,720,995 research outputs found
Upgrading equipment and procedures for stress path triaxial testing of coarse grained materials.
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Upgrading equipment and procedures for stress path triaxial testing of coarse grained materials.
No full textOttimizzazione del controllo di un'apparecchiatura triassiale a stress-path controllato di grandi dimensioni
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The diameter of single, double and triple fluid jet grouting columns: prediction method and field trial results.
No full textIn this paper, a simple expression to predict the average diameter of columns created with single,
double and triple fluid jet grouting is proposed considering both the energy of the eroding jet and the
resistance of the soil. The injection system (single, double or triple) and the composition of the
injected fluids are taken into account on the basis of theoretical analysis of the turbulent diffusion of
submerged jets. Instead of separately considering the energy of the air jet shrouding the eroding fluid,
a simple parameter is introduced which represents the beneficial effect of air in reducing the energetic
dissipation on the jet external surface. In this way, a new expression of the specific kinetic energy of
the jet at any distance from the nozzle is proposed, which is a relevant step forward if compared with
that at the nozzle or at the pump previously proposed, as it takes into account both the system
characteristics and the composition of the eroding jet (either grout or water). In the expression
proposed to predict the diameter of jet grouting columns, soil resistance is considered by way of the
results of the standard penetration test and cone penetration test, in terms of NSPT and qc respectively.
The expression has been calibrated on a number of experimental data, and in most cases proved its
efficiency in predicting columns’ diameter with a scatter of less than 20%. The field trials results
highlight that jet grouting is more effective in coarse-grained soils, as clearly shown by an efficiency
parameter proposed by the authors. Design charts are drawn to quickly estimate the average diameter
Da for different soils, injection systems and input energies
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
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