1,721,294 research outputs found
Buckling Behavior of Composite Laminated Stiffened Panels Under Combined Shear-Axial Compression
No full textExperimental results are reported on the behavior of four torsion boxes, each comprising two stringer-stiffened cylindrical graphite-epoxy composite panels that were subjected to torsion, axial loading, and their combinations. The buckling and postbuckling behavior of these torsion boxes demonstrated consistent results. Before performing the buckling tests, the initial geometric imperfections of the panels forming the boxes were scanned and recorded. The tests were complemented by finite element calculations that were performed for each box. These detailed calculations also assisted in identifying critical regions of the boxes, and the boxes were reinforced accordingly, to avoid their premature failure. The tests indicated that the torsion-carrying capacity was dependent on stringer geometry and layup; axial compression results were in very good agreement with previous tests carried out with single identical panels; and the boxes have a very high postbuckling-carrying capacity. Comparisons of the experimentally experienced first (skin) buckling loads and collapse torques with finite element analyses predictions were found to be in good agreement for torsion and for axial compression. The experimental results under combined
loading were consistently lower than with the numerical results. This might have stemmed from repeated buckling tests used in the present test program to generate the experimental interaction curve, which could have introduced residual strains/deformations in the skin that influenced the skin buckling load capacity, thus yielding a lower first skin buckling load in the subsequent loading stages
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Cyclic Buckling Tests of CFRP Curved Panels
No full textExperimental results obtained on three carbon fibre composite stiffened curved panels subjected to static and cyclic compression and shear loadings are presented. The results obtained from static tests performed on two panels are described in terms of global axial load vs. shortening curve, torque vs. rotation curve, and strain measurements. A third panel was subjected to a cyclic loading, at 2 Hz, from above zero till 1.6 times its static buckling load, allowing the investigation of the effect of cyclic buckling in terms of axial load vs. shortening behaviour and strain measurements. The obtained results show that this kind of structures can well work in the post-buckling field even if during their operative life the buckling load is reached thousands of times
The Behavior of Laminated Composite Stringer Stiffened Curved Panels Under Torsion Moments - Tests Vs. FE Predictions
No full textDispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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