1,721,319 research outputs found
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
3D Pushover Analysis for Evaluating Torsional Effect of RC Structures
No full textIn the recent years, nonlinear static analyses received a great deal of research attention within the earthquake engineering community. Their main goal is to describe the nonlinear capacity of the structure when subjected to horizontal loading with a reduced computational effort with respect to nonlinear dynamic analyses. For 2D frame structures many studies have been performed in order to validate different pushover techniques by comparison with results from dynamic analyses and a good match has been found.
On the contrary, few methods to perform pushover analyses for irregular structures (3D frame structures) can be found. Definition and assessment of 3D pushover methods are much more complex than 2D analyses for several reasons. First of all, a correct horizontal loading
distribution both over the frame height and the floors must be defined in order to take torsional effect into account. Secondly parameters of structural response (maximum displacement and maximum rotation of roof floor, or relative rotation/displacement between floors, and so on) to be predicted by the nonlinear static analyses must be preliminary defined. The second point is
fundamental to evaluate the accuracy of different methodologies.
In the present work, a new pushover procedure for 3D RC structures, named Force/Torque pushover (FTP) is proposed; a set of force and torque distributions is selected, in order to predict the most severe configurations the structure may undergo during the earthquake. Three different worst-case performance conditions for the structure have been selected,
corresponding to the attainment of i) the maximum displacement δmax, ii) the maximum rotation θmax, iii) the maximum strain in concrete core εcu. In the present work, the latter of these conditions has been chosen as the limit state, since it may represent the failure condition
for a given structural element. In order to validate the proposed technique, comparison between results from a series of incremental dynamic analyses and pushover analyses are carried out with an accurate selection of representative parameters of structural response
Consideration of interstory drift profile in selection and scaling of ground motion records
No full textSTATISTICAL VALIDATION OF NONLINEAR PUSHOVER METHODS BY INCREMENTAL DYNAMIC ANALYSES
No full textThe present study aims to validate pushover methodology for RC frame structures by comparison with Incremental Dynamic Analysis (IDA). A high number of simulated response spectrum compatible time-histories has been used to perform incremental dynamic analyses. Different pushover procedures have been considered, i.e., conventional (first mode load distribution, uniform distribution) and adaptive pushover method (DAP). With reference to three case studies, comparison of static against dynamic results has been performed in terms of capacity curves, interstorey drift profiles, maximum top displacements and failure modes
3D Pushover Methods for Irregular RC Structures
No full textIn the present study, a pushover procedure for 3D frame structures is proposed. A new way to define a set of horizontal force and torque distributions to apply at the floor levels is proposed here. For predicting the behaviour of irregular structures in the worst configurations, more than one pushover analyses must be performed. The proposed method is validated by a consistent comparison of results from static and dynamic analyses in terms of different response parameters, such as displacements, rotations, floor shears and floor torques. Starting from the linear analysis, the pro-cedure is subsequently extended to nonlinear cases. The results confirm the effec-tiveness of the proposed procedure to predict the structural behaviour in the most dangerous configurations
Using the Applied Element Method to simulate the dynamic response of full-scale URM houses tested to collapse or near-collapse conditions
No full textNumerical modelling of the out-of-plane response of full-scale brick masonry prototypes subjected to incremental dynamic shake-table tests
No full textStructural failure of existing unreinforced masonry buildings, when subjected to earthquake loading, is often caused by the out-of-plane response of masonry walls. Their out-of-plane resistance could vary considerably depending on several factors, such as boundary conditions, vertical overburden and construction technique. Amongst the latter, the cavity wall system, originally introduced in Northwest Europe in the 19th century and then spread to several countries including USA, Canada, China, Australia and New Zealand, has been shown to be particularly vulnerable towards out-of-plane actions. In this work, the use of the Applied Element Method was investigated and subsequently considered for reproducing the experimentally observed out-of-plane shake-table response of unreinforced masonry full-scale cavity wall specimens subjected to both one-way and two-way bending. Finally, given the adequate results obtained and aimed at investigating further both potential limits and actual capabilities of the adopted modelling strategy, the latter was also extended to the simulation of the dynamic out-of-plane-governed failure mode of a full-scale building specimen tested up to complete collapse
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