1,721,561 research outputs found
High-resolution GPR survey for masonry wall diagnostics
No full textGround-penetrating Radar (GPR) is a non-invasive technique with increasing focus on civil-engineering applications. Referring to existing constructions, the most recent International and National Codes suggest a knowledge-based approach, which is mandatory before any structural assessment or design of interventions. The knowledge-based process includes experimental investigations aimed at the detailed geometrical and structural relief as well as to the evaluation of the materials mechanical properties. However, when dealing with built Cultural Heritage, destructive techniques should be limited or even forbidden. In this context, non-destructive investigations play a key role and their effectiveness should be further studied in relation to specific applications. To this end, Ground-penetrating Radar surveys were performed in the test site of the Laboratory of Applied Geophysics, the University of Salento, Lecce (Italy), with the aim of simulating various real-life practical applications. In particular, several objects of different materials and geometries were buried in the subsurface and a small building was built in the area using different construction techniques, among them, multi-leaf masonry walls, also called sack masonry walls, were constructed. The GPR method can detect both the presence of hidden bodies and different leafs of the walls with a relative efficiency depending on the field context, the dielectric properties of the host material, and the nature and size of the bodies. In this work, a test was planned to verify 900 and 2000 MHz antenna resolutions. The data acquired with the 2000 MHz antenna were used to estimate the mean electromagnetic wave propagation velocity in the sack masonry layers of known thickness and to understand if the inner core was filled with material other than air. The authors propose a high-resolution method to improve the velocity estimation using geometrical optics laws and the sign of the reflection coefficient in order to properly select the arrivals from different interfaces
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
‘The habits we are’: the second nature of the mind and its defences against crisis
No full textIndividuals’ self-psychological integrity is at the centre of this study. Considering the relation between unconscious cognitive processes and self-consciousness, the authors discuss the social and emotive relationship’s role in the construction of the mind
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
A Procedure for Determining the Centromere in the Classification of Wheat Methaphase by Digital Computer
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