1,721,024 research outputs found
Solution Approaches for the Stochastic Capacitated Traveling Salesmen Location Problem with Recourse
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Visco-elastic modeling for railway track structure layers [Modellazione del comportamento visco-elastico degli strati della sede ferroviaria]
No full textThis article proposes a method of calculation for evaluating stresses and strains in the track structure. This condition is calculated by modelling the single elements composing the structure, considering the loads and the number of traffic repetitions, the characteristics of the materials, and the environmental conditions. The method can be used both in the design phase to optimize the choice of the materials to be used and in the operation phase to verify the real service life of the structure in the presence of substantial variations in the data presumed in the design phase. The method has been validated with the experimental data collected by R.F.I. The method has been applied to evaluate the service life of a track, considering the layer mechanical characteristics and the air temperatures.This article proposes a method of calculation for evaluating stresses and strains in the track structure. This condition is calculated by modelling the single elements composing the structure, considering the loads and the number of traffic repetitions, the characteristics of the materials, and the environmental conditions.
The method can be used both in the design phase to optimize the choice of the materials to be used and in the operation phase to verify the real service life of the structure in the presence of substantial variations in the data presumed in the design phase.
The method has been validated with the experimental data collected by R.F.I. The method has been applied to evaluate the service life of a track, considering the layer mechanical characteristics and the air temperatures
Comparison of computational methods for the estimation of the dielectrophoretic force acting on biological cells and aggregates in silicon labonchip
No full textDielectrophoresis (DEP) is a promising method for particles manipulation without physical contact in silicon lab-on-chip devices. It exploits the dielectric properties of cells and aggregates suspended in a microfluidic sample under the action of high-gradient electric fields. The force is approximated by a truncation of a multipole expansion which, for single cell, reduces to the first order contribution. When the cells aggregate is “big” further terms should be considered involving higher order field derivatives. Here, we compare different force approximations, depending on the aggregate's dimension and on the non-uniformity of the electric field. Numerical modeling has been performed by using COMSOL Multiphysics to compute the electric field, to quantify the DEP forces and to simulate the particles tracings that have been compared with experimental results developed in several settings
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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