1,720,955 research outputs found
Buckling and debond growth of partial debonds in adhesively bonded composite flanges
No full textThe strains at which buckling and debond growth occur in adhesively bonded composite flanges containing an initial debond were experimentally measured using sandwich panel and coupon type specimens. Test parameters investigated were: initial debond geometry, the adhesive critical strain energy release rate (Gc), flange material stiffness, and layup sequence. Buckling strains were found to be dependent on initial debond length, flange stiffness and layup sequence. Flanges with a longer initial debond length showed lower buckling strains. Buckling strains increased as the twisting to bending stiffness ratio (D66/D11) increased due to changes in flange layup sequence. Debond growth was found to be strongly dependent on initial debond length but, weakly dependent on flange width. Flanges having higher bending stiffness exhibited a significantly lower debonding strain. Ultrasonic C-scans revealed that debond growth occurred along a curved front, as dictated by the post-buckling deformation of the flanges. Finally, changes in twisting to bending stiffness ratio (D66/D11) due to different flange layup sequences resulted in a variation of post-buckled flange out-of-plane (u3) deformation shape. This was found to affect the debond front shapes as the debond grew. Finite Element Analysis (FEA) based Virtual Crack Closure Technique (VCCT) fracture analysis was conducted. Critical strain energy release rates measured from Double Cantilever Beam (DCB) and Mixed-Mode Fracture (MMF) tests were used as input values and the FEA predictions were shown to be capable of accurately simulating the buckling and debonding behaviors. The FEA study included all the testing parameters investigated in the experiments and also revealed the mode-I, II and III strain energy release rate profiles at the debond front. From the strain energy release rate profiles, fracture mode content and the major fracture mode in each specimen type were clearly understood. The FEA methodology developed within the current study has been shown to be capable of predicting the buckling and debonding tests very well. Being FEA based, this methodology can be applied to the analysis of other facture problems which due to their complexity would otherwise require expensive experimental investigation
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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