1,720,994 research outputs found
Fetal heart rate pattern in term or near-term cerebral palsy: looking at the data in the right perspective
No full textKinetics of island growth in the framework of "planar diffusion zones" and "3D nucleation and growth" models for electrodeposition
No full textIn the electrochemical deposition of thin films, the measurement of the current-time curve does not allow for a direct determination
of the nucleus growth law, electrode surface coverage, and mean film thickness. In this work, we present a theoretical
approach suitable to gain insight into these quantities from the knowledge of nucleation density, solution parameters, and currenttime
behavior. The model applies to both isotropic and anisotropic growth rates of nuclei and a study on the effect of nucleus
shape and aspect ratio on the kinetics is presented. Computer simulations and experimental results from literature are also
discussed in the framework of the present approach
Kinetics of phase transformations with heterogeneous correlated nucleation
No full textWe develop a stochastic approach for describing the kinetics of 3D-phase transformations
ruled by time-dependent correlated nucleation at solid surfaces. The kinetics is expressed
as a series of correlation functions and, at odds with modeling based on Poisson statistics,
it is formulated in terms of actual nucleation rate. It is shown that truncation of the series
up to second order terms in correlation functions provides a very good approximation
of the kinetics. The time evolution of both total amount of growing phase and surface
coverage by the new phase have been determined. The theory is applied to describe
progressive nucleation with parabolic growth under time dependent hard-disk correlation.
This approach is suitable for describing electrochemical deposition by nucleation and
growth where correlation effects are significant. In this ambit the effect of correlated
nucleation on the behavior of kinetic quantities used to study electrodeposition has also
been investigated
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
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