1,720,964 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
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
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
Effect of chill condition and grain refinement on the microstructure and mechanical properties of B319 aluminum alloy
No full textThe demand for lightweight vehicles continues to stimulate extensive research into the development of lightweight aluminum alloys for automotive castings and associated optimization of the processing parameters. However, the mechanical properties (hardness, tensile strength and thermal fatigue resistance) of many alloys still remain low for many applications in the automotive engine market. In order to improve the mechanical properties, a fine grain size of the as-cast alloy is preferred, which can be most commonly achieved in the foundry industry by: a) Higher cooling rate; or b) Addition of grain refiners.
To provide higher cooling rates, chill is often placed in the casting cavity to act as a heat sink and consequently increase the local solidification rate. More aggressive cooling can be achieved by running water through the chill. However, high thermal gradients may develop residual strain in the as-cast alloy, which may be detrimental to the life-cycle of the automotive part and thus needs to be evaluated. The results of this thesis suggest that water cooled chill provides higher thermal gradient, resulting in a finer grain size and improved hardness with lower residual strain and texture as compared to no water cooled chill cast samples. Delaying water flow in the chill after 10 seconds introduces anisotropy in a casting by developing a fibre texture as compared to the samples prepared with continuously water cooled chill.
Grain refinement is a well established foundry practice to inoculate the melt by the addition of grain refiner, which acts as heterogeneous nucleation site for solidifying α-Al to form a fine grained microstructure. Industrial grain refiners used for aluminum castings are generally master alloys of Al, Ti, B and C with specific stoichiometric ratio. In the present study, TiC powder was tested as grain refiner to effectively refine the microstructure of B319 alloy. The results showed that 0.03 wt% TiC addition refined the microstructure, lowered the SDAS and assisted in the segregation of secondary phases, which in turn resulted in increased hardness and yield strength.Applied Science, Faculty ofEngineering, School of (Okanagan)Graduat
Ab initio study of lithium dynamics in silicon-based materials for battery applications
No full textSilicon-based materials are promising candidates to replace commercial graphite-based anodes in lithium ion batteries. Silicon-based anodes can possess 10 times more capacity than graphite, but with a humongous volume expansion of 300%. At the atomic scale, the rate of lithium migration plays a key role in controlling the volume expansion. Thus, understanding the lithium atom migration and the structural evolution of Si atoms at atomic scale is essential to mitigate volume expansion and achieve maximum capacity. In this thesis, we approached this problem from two ends: 1) Studying diffusion of lithium in bulk silicon and lithiated LiSi from first-principles methods within the transition state theory framework, and 2) Analysing delithiation dynamics through first-principles followed by an empirical potential to study large supercells. Our approach provides a better agreement with the experimental data as compared to the previous experimental or theoretical data with useful insight on the diffusion mechanism. The impact of quantum tunnelling effects and anharmonicity on lithium diffusion have also been estimated for the first time and are moderate for Si and negligible for the LiSi case. A novel first-principles-based approach has been developed to study the step-by-step delithiation of lithium atoms, which can capture the change in the local environment of silicon during delithiation. The analysis of the local environment of delithiated Si suggests that most of the delithiated silicon atoms (75%) returns back to the tetrahedral coordination. The characterization of delithiated silicon obtained by empirical potential shows strong resemblance with amorphous Si.(FSA - Sciences de l'ingénieur) -- UCL, 202
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