1,720,955 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
Bubble sizes in cylindrical equipment are satisfactorily predicted from theory and from two-dimensional studies. The distribution of gas between dense and bubble phases is calculated from bed expansion data
No full textGas fluidized beds have provided fascinating and infuriating problems for both the academic and industrial engineer. Although
fluidization phenomena have been the subject of many hundreds of papers we still cannot dispense with experimentation in order to predict bed behaviour even for relatively simple operations, let alone complex chemical reactions.
This thesis provides a broad but brief scrutiny of the fluidization behaviour of a wide variety of powders and then focuses on one specific but important question: how can we predict the sizes of bubbles under given conditions in a large fluidized bed?
Experimental work on a wide variety of sands and other materials has been carried out in cylindrical columns 5 cm and 50.8 cm diameter, and in addition films from two two-dimensional beds have been analysed.
Fluidized solids have been classified into four groups characterised by density differences Pg-Pf, mean particle size, and gas viscosity.
A critical examination of the results of previous workers together with the new experimental work has shown that within one of the largest groups, bubble size is independent both of mean particle size and - more significantly - of particle size distribution.
An equation has been developed which relates bubble size to the gas distributor design, distance above the distributor and the excess gas velocity U-U0 , and good agreement is obtained with published data relating to larger beds fitted with commercial distributors.
Measurements of bed expansion combined with the analysis of films from two- and three-dimensional equipment have proved useful in evaluating the distribution of gas between dense and bubble phases.
For a given value of U-U0, the visible bubble flow rate decreases as particle size increases. This is because the through-flow of gas from bubble to bubble is proportional to the minimum fluidization velocity U0. As a result both bubble concentration and bed expansion decline with increasing particle size but bubble size is not affected.
An equation has been developed which enables the visible bubble flow rate to be calculated from measurements of bed expansion and U-U0 alone.
bubble concentration, frequency and size have been compared at the surfaces of two- and three-dimensional beds under corresponding conditions of distributor design, bed height and gas velocity. Bubble sizes are significantly larger in the three-dimensional equipment and this is believed to be due to the predominance of out-of-line coalescence. A transformation procedure has been developed for the prediction of dimensional bubble sizes from two-dimensional data, and has been successfully applied to the only sand so far tested
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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