1,720,980 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
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
Influence of materials processing on impact properties of compression-moulded commingled thermoplastic composites
No full textThe impact properties of commingled E-glass-polypropylene composites with varying fibre architectures have been investigated. The fabric structures include balanced and unbalanced twill weaves and a three-dimensional woven fabric. Comparative data for glass mat thermoplastics are included and additional comparisons with crossply continuous filament tape laminates are also made. All the materials were processed into flat panels via non-isothermal compression moulding. First, voidage was correlated with processing parameters to produce well consolidated laminates. Mechanical tests included tensile, flexural, and interlaminar shear. Impact tests include Charpy and falling weight; the latter ranged from 15 J to full penetration and were followed by IR thermography and microscopy to determine the extent of damage areas. The results demonstrate the evolution of damage with increasing impact energies and the mode of impact damage propagation for the different fibre architectures
Void content measurements in thermoplastic composite materials through image analysis from optical micrographs
No full textThe principal interest of measuring the level of internal porosity in composite materials lies in the
possibility of relating void content with macro and micro-structural properties and hence with
composite manufacturing quality. In the particular case of commingled E-glass/polypropylene
composites, processing parameters, such as moulding pressure and material temperature, have been
demonstrated to influence void content, which is in turn affecting mechanical and impact properties of
the material. It is of paramount importance therefore to dispose of a simple and reliable method for
void content determination on these composites, which are increasingly used e.g., in automotive
industry, for their energy absorbing properties and their low cost.
In this paper, void measurements in E-glass/polypropylene commingled laminates are performed by
analysing images from optical micrographs. Voids were classified, due to their size and orientation, as
microvoids, intratow voidage, coplanar voids and extensive voids. In practice, optical microscopy of
specimens was able to detect void contents of less than 1% using a statistical point-counting technique.
Computerised analysis of the micrographs was also possible, based on the grey scale difference
existing between voids and the rest of the composite image (matrix, reinforcement). Possibilities and
limitations of this approach are highlighted by discussing the relation between the sample of the
material considered and the obtained accuracy, which depends also on image filtering and appropriate
1image thresholding. Due to the complex structure of Twintex laminates and to consequent large
deviation in void content values, not less than 80% of any cross-section (20 mm. long) removed from
the laminate should be examined to obtain a measurement of the void content percent with an error of
0.15. With void contents ranging from 0.6 to 15%, this corresponds to an accuracy of void content
measurement variable from ±0.1 to ±2%. In practice, this accuracy can only be obtained, if a significant number of cross-sections are removed from different regions of the laminate
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
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