1,721,007 research outputs found
Kinematic Bending Moments in Square Pile Groups
No full textThis paper describes kinematic seismic interaction analysis of square pile groups in homogeneous soil deposits, focusing on bending
moments induced by the transient motion. Analyses were performed by means of a three-dimensional (3D) numerical procedure able to
account for both pile–soil–pile interaction and radiation damping. The seismic motion was defined by an artificial accelerogram at the outcropping
bedrock, and one-dimensional (1D) propagation analyses were performed to define the free-field motion within the deposits. An extensive
parametric study was conducted to determine the effects of different variables, such as the soil properties, the bedrock location, the number of
piles, and the pile spacing, on the dynamic response of pile-group foundations. Bending moments obtained from the analyses of the pile group,
both at the pile head and at the interface separating soil layers, were normalized with respect to the single-pile bending moments, allowing for
the proposal of a new design formula for the estimation of the kinematic bending moments in the most stressed pile of the group, starting from
the knowledge of the single-pile response. The proposed formula was used, in conjunction with some simplified approaches that allow estimation
of the single-pile response, to evaluate bending moments in the analyzed pile groups. The adequacy of the formula for design purposes is
demonstrated
Re-assessment of foundation settlements for the Burj Khalifa,Dubai
No full textThis paper deals with the re-assessment of
foundation settlements for the Burj Khalifa Tower in
Dubai. The foundation system for the tower is a piled raft,
founded on deep deposits of calcareous rocks. Two computer
programs, Geotechnical Analysis of Raft with Piles
(GARP) and Non-linear Analysis of Piled Rafts (NAPRA)
have been used for the settlement analyses, and the paper
outlines the procedure adopted to re-assess the foundation
settlements based on a careful interpretation of load tests
on trial piles in which the interaction effects of the pile test
set-up are allowed for. The paper then examines the
influence of a series of factors on the computed settlements.
In order to obtain reasonable estimates of differential
settlements within the system, it is found desirable to
incorporate the effects of the superstructure stiffness which
act to increase the stiffness of the overall foundation system.
Values of average and differential settlements for the
piled raft calculated with GARP and NAPRA were found
to be in reasonable agreement with measured data on settlementstaken near the end of construction of the tower
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
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