1,720,969 research outputs found
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
The structure and flow of disordered wet foams
No full textTHESIS 10834This thesis concerns the structure and flow properties of wet foams. We primarily use computer simulations of soft particles to model the behaviour of disordered wet foams. We investigate the properties of 2D and 3D polydis- perse packings of soft particles and the flow of 2D soft discs as model systems for wet foams
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
Properties of lightweight fibrous materials made using a foam-forming technique
No full textThis thesis concerns the production and characterisation of foam-formed fibrous materials made from wood, peat fibres and spent grain. Such materials might find commercial applications for insulating purposes when produced at low density, or replace cardboard when produced at higher densities. The materials are produced by axially shearing a fibre-laden aqueous solution to which a surfactant has been added. The dispersion is then poured into a drainage vessel, where the liquid drains via gravity resulting in a lightweight fibrous sample.
The addition of fibres to an aqueous foam changes its properties. By adding fibres, a foam?s lifetime can be greatly extended. Furthermore, the fibres place an upper limit on the average bubble size by arresting bubble growth during coarsening.
The influence of fibre concentration and liquid content of a foam-fibre dispersion is explored. We report a minimum fibre concentration required for sample stability. We show how both fibre concentration and the liquid content of the dispersion affects sample density. Uniaxial compression testing shows that the compressive modulus scales linearly with sample density. The liquid content of the dispersion can also be used to tune the sample compressive strength, when compressed in all three axial directions. The compressive modulus is increased by a factor of up to seven, just by changing the liquid content of the dispersion from 25% to 50% (with no change to sample density). The higher the sample density, the larger the range over which we can vary the compressive strength through the liquid content.
The role of liquid drainage is explored by comparing samples made using dispersions with the same volume of liquid, but varying the drainage rate. We find that the rate of liquid drainage has a larger impact on the compressive strength than the volume of liquid.
We image our samples using uCT scanning and relate the fibre orientation distributions to both the compressive strength of the material and the liquid content of the dispersions. Void size is shown to be similar to the average bubble size of the dispersion from which it was produced.
Our samples display an anisotropic response to uniaxial compression when compressed in different directions. We attribute this behaviour to a layering of fibres that occurs during sample production. Increasing the liquid content of the dispersion increases the number of fibres which orientate out of these layers, changing the material?s compressive strength. Using Euler?s formula for buckling we propose an explanation for the observed stress-strain response.
We present a case study in which we use the foam-forming technique to create beer coasters from brewers spent grain. We probe our samples for the key requirements of commercial beer coasters, such as the rate of liquid absorption, quantity of liquid absorbed and tensile strength. The experiments show that the spent grain coasters absorb liquid at a faster rate and absorb more liquid during a fixed period of time than the commercial coasters.
We conclude our results and, focusing on a theme in which we encourage industry to replace non-sustainable materials with foam-formed fibrous alternatives, we identify and propose a direction for the continuation of the project to further explore and improve typical key material requirements. Experiments on compressive strength, recovery and thermal conductivity are proposed. We also set out the preliminary results of an experiment to measure bubble size from the vibrational response emitted as it ruptures. This is a non-invasive method to measure coarsening and may be useful in an industrial setting
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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