1,721,031 research outputs found
Concrete damaged plasticity model for simulation of fibre-reinforced polymer-confined concrete-filled steel tubes
No full textCyclic response of FRP-to-concrete adhesive joints: effect of the shape of bond-slip model
No full textAlthough the strengthening of reinforced concrete (RC) structures using externally bonded fiber-reinforced polymers (FRPs) have been widely accepted as an excellent technical solution for structural strengthening, only few studies have been conducted to understand and predict the behaviour of FRP-to-concrete bonded joints under cyclic loadings. This paper summarizes the results of a theoretical study aimed at investigating the effect of the shape of bond-slip models on the behaviour of the FRP-to-concrete bonded interfaces under cyclic loading.
Two bond-slip model shapes, one with a linear descending branch and another with an exponential descending branch were used in this study. Evolution of damage for each bond-slip model was defined using the existing test data on Carbon FRP (CFRP)-to-concrete bonded joints under cyclic loading. These bond-slip models were then used to predict the behaviour of a CFRP-to-concrete bond joint subjected to cyclic loading. The results are then compared with the experimental results from a CFRP-to-concrete single shear pull off test under cyclic loading
Numerical studies of gypsum plasterboard and MGO board lined LSF walls exposed to fire
No full textFire resistance of cold-formed light gauge steel frame (LSF) wall systems is enhanced by lining them with\ud
single or multiple layers of wall boards with varying thermal properties. These wall boards are gypsum\ud
plasterboards or Magnesium Oxide (MgO) boards produced by different manufacturers. Thermal properties of\ud
these boards appear to show considerable variations and this can lead to varying fire resistance levels (FRL) for\ud
their wall systems. Currently FRLs of wall systems are determined using full scale fire tests, but they are time\ud
consuming and expensive. Recent research studies on the fire performance of LSF wall systems have used finite\ud
element studies to overcome this problem, but they were developed based on 1-D and 2-D finite element\ud
platform capable of performing either heat transfer or structural analysis separately. Hence in this research a 3-D\ud
finite element model was developed first for LSF walls lined with gypsum plasterboard and cavity insulation\ud
materials. Accurate thermal properties of these boards are essential for finite element modelling, and thus they\ud
were measured at both ambient and elevated temperatures. This experimental study included specific heat,\ud
relative density and thermal conductivity of boards. The developed 3-D finite element model was then validated\ud
using the available fire tests results of LSF walls lined with gypsum plasterboard, and is being used to\ud
investigate the fire performance of different LSF wall configurations. The tested MgO board exhibited\ud
significant variations in their thermal properties in comparison to gypsum plasterboards with about 50% loss of\ud
its initial mass at about 500 ºC compared to 16% for gypsum plasterboards. Hence the FRL of MgO board lined\ud
LSF wall systems is likely to be significantly reduced. This paper presents the details of this research study on\ud
the fire performance of LSF wall systems lined with gypsum plasterboard and MgO board including the\ud
developed 3-D finite element models, thermal property tests and the results
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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