1,720,989 research outputs found
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
Towards a revised virtual crack closure technique for bimaterial interface cracks
No full textThe virtual crack closure technique (VCCT) is a well-established method for computing the energy release rate, G, when analysing fracture problems via the finite element method. For mixed-mode fracture problems, the VCCT is also used to partition the fracture modes, i.e. to determine the energy release rate contributions related to the three fracture modes, GI, GII, and GIII.
Recently, it has been pointed out that in some circumstances, the standard VCCT may yield physically inconsistent, negative values for the modal contributions to the energy release rate. Furthermore, it has been shown that responsible for these results is the lack of energetic orthogonality between the crack-tip force components used to compute the modal contributions by the standard VCCT. Hence, a revised VCCT has been developed that overcomes the aforesaid drawbacks and furnishes a physically consistent partitioning of fracture modes.
Until now, application of the revised VCCT has been limited to problems where isotropic and homogeneous cracked bodies undergo I/II mixed-mode fracture conditions because of asymmetries in the geometry or loads. However, the standard VCCT may yield negative values of GI and GII also when analysing problems concerning bimaterial interface cracks. Actually, application of the standard VCCT itself for bimaterial interface cracks is still controversial because the energy release rate contributions are strongly dependent on the assumed crack extension length, due to the oscillatory nature of the stress and displacement fields in the neighbourhood of the crack tip.
The current work is intended as a first step towards extending the revised VCCT to problems of bimaterial interface cracks
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
Dispelling 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Enhanced beam-theory models for delamination test specimens
No full textA wide variety of laboratory tests is currently employed to characterise the delamination toughness of composite laminates in both pure and mixed fracture modes. Test results are interpreted by means of suitable theoretical models, which enable the determination of the critical energy release rate, Gc, and its modal contributions, GIc, GIIc, and GIIIc.
In the case of I/II mixed-mode fracture, the Authors have developed enhanced beam-theory models of the ADCB and MMB tests, where the specimen’s delaminating layers are modelled as laminated beams connected by an elastic–brittle interface. Accordingly, the exchange of normal and tangential interfacial stresses between the sublaminates is explicitly accounted for, in particular in the neighbourhood of the crack-tip.
The adopted modelling approach has been later generalised to deal with the case of a delaminated laminate subjected to generic boundary conditions, showing that a complete explicit solution to the problem can be deduced, including analytical expressions for the internal forces, interfacial stresses, energy release rate, and mode-mixity angle. The solution obtained can be effectively applied to interpret experimental results of the most popular mixed-mode delamination test specimens such as, for instance, the ADCB, ELS, MMB, and SLB tests
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