1,720,999 research outputs found
Non-structural cracking in RC walls: Part II. Quantitative prediction model
No full textIn this paper, for a quantitative assessment of non-structural cracking in an RC wall, an improved analytical model is proposed. First of all, to quantitatively calculate the cracking potential, an analytical model that can estimate the post-cracking behavior in an RC tension member is proposed. Unlike conventional approaches that use the bond-slip relationship or the assumed bond stress distribution, in our proposed approach the tensile strength of concrete at the post-cracking stage is quantified on the basis of polynomial strain distribution functions of steel and concrete. Predictions of cracking loads and elongations of reinforcing steel in RC tension members using the proposed model show good agreement with results from previous analytical studies and from experimental data. Subsequent comparisons of analytical results with test results verify that the combined use of both the approach in this paper as well as the approach previously introduced in the companion paper to this research make it possible to accurately predict the cracking behavior of RC walls. Additionally, the influence of changes in the material properties and construction conditions on the cracking in RC walls is investigated theoretically, using the numerical model proposed in this paper. (c) 2005 Elsevier Ltd. All rights reserved.The authors would like to thank the Infra-Structures
Assessment Research Center (ISARC) funded by Korea
Ministry of Construction and Transportation (MOCT) for
financial support
Plastic shrinkage cracking in concrete slabs. Part II: numerical experiment and prediction of occurrence
No full textIn the present paper, the influence on plastic shrinkage cracking of many factors related to concrete mixture properties and weather conditions are analysed through parametric studies using the numerical models introduced in the companion paper. First of all, through a systematic calculation of bleeding, a relationship between the bleeding constants and the concrete mixture is proposed on the basis of the experimental data previously obtained by many researchers. Moreover, an equation is introduced that can directly determine the critical point at which the evaporation and bleeding are balanced, and the efficiency of the introduced equation is verified through a correlation study between the results obtained with the introduced equations and those from rigorous analyses. The introduced equations can be effectively used to predict and prevent the occurrence of plastic shrinkage cracking without any rigorous analysis and, in addition, to cope with sudden changes in the concrete mixture and/or in weather conditions.The authors thank the Infra-Structures Assessment
Research Center (ISARC), funded by Korea Ministry
of Construction and Transportation (MOCT), for financial
support
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
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