1,720,963 research outputs found
I percorsi nascosti. Il tracciato alta velocità Bologna-Firenze
No full textStoria naturale e storia degli insediamenti integrate in unità territoriali organich
Detection of seismic damage on a RC building using the proportional flexibility-resembling matrix
No full textWhen an existing civil structure experiences a significant seismic event, permanent reductions of stiffness may be induced, thus resulting in changes in its dynamic behavior. Ambient vibration surveys performed before and after a seismic event are thus useful tools for the inspection and management process of the structure. A vibration-based approach for damage detection and localization has been developed by the authors in previous research. This approach is based on estimating a matrix that approximates a proportional flexibility matrix, termed proportional flexibility-resembling (PFR) matrix. This matrix is computed through signal processing operations to be executed after applying the first steps of the Frequency-Domain Decomposition technique. The main feature of the PFR matrix, compared to the traditional modal flexibility matrix, is that it can be assembled without the need of an explicit identification of the modal parameters. The matrix is in fact obtained by processing all first singular vectors and also all first singular values in a selected frequency range. In previous research by the authors the approach has been validated through numerical simulations and using the experimental data of laboratory tests performed on a small-scale frame structure. The objective of this contribution is to test the approach based on the PFR matrix on a full-scale reinforced concrete (RC) building structure that has experienced seismic damage. This structure was tested on the large-scale Network for Earthquake Engineering Simulation (NEES) shaking table of the University of California, San Diego (UCSD). During the experimental tests, some historical earthquake records were applied at the base of the building structure, and this induced progressively increasing levels of damage. After each strong motion test, low-amplitude vibration tests were performed for damage characterization purposes
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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