1,721,041 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
Scripts from: Quantitative Prediction of the Thermal and Mechanical Properties of Phenol-Formaldehyde Novolak Thermosets
No full text<div>The scripts deposited here were used to assist in the development of a method of simulating the high temperature pyrolysis of phenol-formaldehyde resin using a novel technique (targeted pyrolysis product removal) and to predict the thermal conductivity of polymer char structures.</div>
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<div>These scripts were written during the course of reserach for the doctoral thesis entitled:</div>
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<p>Quantitative Prediction of the Thermal and Mechanical Properties of Phenol-Formaldehyde Novolak Thermosets</p>
<p>DOI: https://doi.org/10.15126/thesis.900768</p>
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<div>Abstract:</div>
<div>In this thesis, a novel method for simulating the complete pyrolysis and charring process of phenol-formaldehyde resins using reactive molecular dynamics and targeted pyrolysis product removal was demonstrated. This method was able to produce fully carbonised structures within 2 ns of simulation time (where 6 ns simulations without product removal showed no significant formation of carbon clusters). Simulated pyrolysis was carried out on a series of models of phenol-formaldehyde resin, a polymer used in spacecraft ablative thermal protection systems. Pyrolysis was carried out at 1500 K, 2500 K and 3500 K using a hydrocarbon oxidation parameter set for the ReaxFF forcefield. The reactions occurring during the thermal decomposition of the polymer structures were investigated using detailed atomic trajectories and connectivity data, allowing elucidation of the mechanisms of pyrolysis and thermal decomposition at the atomic scale. The evolution of the structure of the resin and char during pyrolysis was reported and the effects of structure size, degree of cure, and curing algorithm were quantified. Six major stages of phenol-formaldehyde resin pyrolysis were highlighted. Predictions of elastic moduli, specific heat capacities and thermal conductivities of phenol- formaldehyde resin (and the chars obtained from pyrolysis) were also made using various simulation techniques.</div>
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
Data from: Quantitative Prediction of the Thermal and Mechanical Properties of Phenol-Formaldehyde Novolak Thermosets
No full text<div>
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<div>The data deposited here comprises outputs from molecular dynamics simulations of phenol-formaldehyde resin structures using reactive molecular dynamics to examine the pyrolysis process using a novel technique (targeted pyrolysis product removal). It also contains the structure data used as inputs and the structures after pyrolysis.</div>
<div> </div>
<div>This data was generated during the course of reserach for the doctoral thesis entitled:</div>
<div>
<p>Quantitative Prediction of the Thermal and Mechanical Properties of Phenol-Formaldehyde Novolak Thermosets</p>
<p>DOI: https://doi.org/10.15126/thesis.900768</p>
</div>
<div>Abstract:</div>
<div>In this thesis, a novel method for simulating the complete pyrolysis and charring process of phenol-formaldehyde resins using reactive molecular dynamics and targeted pyrolysis product removal was demonstrated. This method was able to produce fully carbonised structures within 2 ns of simulation time (where 6 ns simulations without product removal showed no significant formation of carbon clusters). Simulated pyrolysis was carried out on a series of models of phenol-formaldehyde resin, a polymer used in spacecraft ablative thermal protection systems. Pyrolysis was carried out at 1500 K, 2500 K and 3500 K using a hydrocarbon oxidation parameter set for the ReaxFF forcefield. The reactions occurring during the thermal decomposition of the polymer structures were investigated using detailed atomic trajectories and connectivity data, allowing elucidation of the mechanisms of pyrolysis and thermal decomposition at the atomic scale. The evolution of the structure of the resin and char during pyrolysis was reported and the effects of structure size, degree of cure, and curing algorithm were quantified. Six major stages of phenol-formaldehyde resin pyrolysis were highlighted. Predictions of elastic moduli, specific heat capacities and thermal conductivities of phenol- formaldehyde resin (and the chars obtained from pyrolysis) were also made using various simulation techniques.</div>
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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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