1,722,860 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
Dependence of XRF intensity on the tilt of the propagation plane
No full textA particular parameterization of both the incident and the take‐off angles in the narrow beam model of the x‐ray fluorescence (XRF) intensity, is introduced. The angles are related to the tilt α of the propagation plane (the plane defined by the incident and emerging beam's directions) and the XRF intensity is studied as a function of α. An interesting geometrical property of XRF is revealed. The primary XRF intensity remains invariant when α changes whereas the secondary and tertiary XRF intensities show a monotonic decrease when α increases. They vanish for the maximum tilt of α = π/2. The different behaviours of the primary intensity on the one hand and the higher orders of XRF on the other allow the isolation of the primary emission. This would not otherwise be possible because the photons under the same spectral line come from all the emission orders. As they have the same energy, they cannot be resolved by the detection system. The theoretical predictions were confirmed experimentally. Measurements were made with a specially built device. Because of the difftculties of measuring near‐horizontal emission, the limit‐angle intensity is determined by extrapolation from intensity measurements at several α. As an example, primary emission of two NBS stainless‐steel standards was obtained. Isolation of the secondary emission is also possible where higher orders are not involved. The fundamentals of this phenomenon may be better understood with the help of a Monte Carlo simulation of the XRF emission from finite slabs, embedded in the infinite target. The simulation shows the strong dependence of the layer emission on α. This result makes it possible to suggest that the angle a may be used as α ‘tuner’ of radiation coming from a given depth. Some practical applications of this geometrical property of XRF intensity are discussed. The intensity change due to a slight tilt of the propagation plane (i.e. a sample improperly placed in the sample holder), is found to besmall. Also, two spectrochemical methods of analysis benefiting from the composition dependence of the reduced intensity and the selective emission from different depths applied to the thickness gauge of thin samples are con‐sidered. Copyright © 1989 John Wiley & Sons, Ltd
Influence of the propagation-plane inclination angle on the fluorescent intensity: Study of the emission of small-thickness samples and determination of the maximum emission angle
No full textA theoretical study of the fluorescent intensity emitted by a small-thickness multicomponent specimen is carried out and a strong dependence on the inclination angle α of the propagation plane is found. The existence of one angular value αM at which the total fluorescent emission achieves a maximum is demonstrated, and it is found that such an angle depends essentially on the sample thickness and composition. Calculating αM by means of the theoretical model, it is possible to select the optimal excitation detection configuration to reach the maximum fluorescent intensity compatible with the characteristics of thickness and composition of the observed sample. Inversely, the thickness of a sample of known composition can be estimated by means of the experimental determination of the angle αM. However, it was found that this thickness measuring method has a very poor sensitivity. The theoretical results have been confirmed by Monte Carlo simulation. © 1989
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