1,720,960 research outputs found
Assessment of performance of steel and GFRP bars as injected anchors in masonry walls
No full textThe first part of the paper presents the results of two series of in situ pull-out tests of injected anchors embedded in existing yellow tuff masonry walls. Anchors are made of steel and GFRP bars with diameter of 12 and 20 mm and were embedded by means of two types of grout: a cement-based and a pozzolana-based grout. The results were examined in terms of both maximum load and displacement to determine the most efficient bar-grout coupling. The experimental pull-out forces are also compared with the predictions given by several literature formulas.
The second part of the paper is devoted to verify the efficiency of the tested injected anchor systems for avoiding out-of-plane damage mechanisms in masonry walls having varying slenderness and subjected to horizontal forces; to this aim parametric analyses were performed to calculate the seismic acceleration required to activate several out-of-plane mechanisms and to verify the effectiveness of injected anchors similar to those experimentally tested into avoiding them
Effectiveness of anchoring devices for CFRP sheets epoxy bonded over tuff blocks
No full textThis paper examines the results of an experimental program made of bond tests on yellow tuff masonry elements externally bonded with Carbon Fibre Reinforced Plastic (CFRP) sheets. The experimental tests have been carried out according to a single pull-push set-up and were mainly aimed to investigate the effectiveness of different anchoring systems for avoiding or delayed debonding phenomena. The experimental results have been examined both in terms of debonding load, load-slips curves and distribution of axial strains in order to highlight the effectiveness of the different anchoring systems
Seismic Rehabilitation of RC Bridges by Using FRP and SRP: Case Study of a Bridge in the South of Italy
No full textIn situ pull-out tests of steel and GFRP injected anchors in masonry walls
No full textThis paper presents the results of experimental in situ pull-out tests of injected anchors embedded in existing masonry walls made of yellow tuff. Anchors made of steel and GFRP bars of 20 mm in diameter were embedded in the masonry using two types of grout: a cement-based and a pozzolanabased grout. The experimental results were examined in terms of both maximum load and displacement to determine the most efficient bar-grout coupling. The experimental results were also compared with theoretical pull-out forces given by some standard code and literature strength models
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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