1,720,970 research outputs found
Corrosion effects on the bending moment-curvature diagram of post-tensioned concrete beams
No full textHigh-strength steel strands used in post-tensioned Reinforced Concrete (RC) elements are prone to corrosion leading to reduced strength and ductility. A new resistance model for corroded strands has been proposed, enabling the development of reduction curves for ultimate strength and displacement, that take into account both the longitudinal and transversal corrosion geometry along the strand and steel material properties. The present paper investigates the effects of corroded strands on the moment-curvature diagram of post-tensioned RC elements. This is evaluated through an equivalent constitutive stressstrain relationship for the steel material resulting from the reduced strength and displacement curves
AN INNOVATIVE INSULATING SYSTEM FOR DUAL SEISMIC AND THERMAL MITIGATION OF MASONRY STRUCTURES
No full textThe proposed work presents the results of an experimental investigation aimed at assessing the performances of unreinforced masonry units retrofitted with an innovative insulating system. The system consists of a reinforced mortar applied on an insulating EPS panel, with the double function of thermal insulation and seismic retrofit. The system has been developed by the Italian company Pontarolo Engineering SpA and studied by the research group at CIRI Building and Construction of University of Bologna. The experimental investigation aimed at assessing the improved shear resistance of masonry panels equipped with the system under study. Diagonal compressive tests were carried out on a series of panels realized with hollow masonry bricks. The results provided an improved response under shear action of the retrofitted masonry panelsfor non-structural infills in RC frames. The investigations proved the effectiveness of the innovative thermal and seismic retrofitting system in improving both shear strength and deformation capacity with respect to the unreinforced traditional masonry units
Corrosion effects on the prestressing force of post-tensioned cables due to lack of mortar injection
No full textThe contribution focuses on the analytical formulation of the effect of localized corrosion on a post-tensioned concrete bridge in which cables were made adherent by cast-in-situ mortar injections. The corrosion is considered homogeneously distributed over a finite portion of the structure characterized by a lack of mortar injection. The dissertation proves that the reduction of the prestressing cross-section area due to corrosion generates losses in the prestressing force and a stress redistribution inside the undamaged cables. These aspects are numerically quantified by considering several percentages of corroded area for the case study of an existing prestressed concrete bridge, providing information for design and monitoring 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
- …
