1,720,960 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
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
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
Non-Perturbative Quantum Field Theory in Extreme Environments
No full textThe aim of this thesis is to describe some physical systems which can be treated by non-perturbative methods in quantum field theory. In the thesis we study systems described by quadratic Hamiltonians, possibly extended with an external electromagnetic field and/or with a thermal heat bath. We also study the (mass less) Schwinger model and boson stars. Apart from the Schwinger model, the systems all have extreme environments. For example, electric field strengths of 1016 V/cm and magnetic field strengths of 109 T as well as temperatures of 109 K are considered. A good conceptual basis for non-perturbative methods in quantum field theory is the functional Schrödinger representation. It is also well-suited for discussing equilibrium as well as out-of-equilibrium statistical mechanics in quantum field theory by means of density matrices. In the thesis we review and develop the functional Schrödinger representation and introduce the so called fermionic field basis. We also extend the analysis to include external electromagnetic fields. Using this setup we study the problem of pair production in an external electric field at finite temperature. It is found that the production of bosons is enhanced at finite temperature while it is suppressed for fermions. We stress the importance of a finite time analysis. In the thesis we also solve the Schwinger model within the functional representation in terms of fermionic variables. In particular the gauge-invariant ground-state functional is found. Moreover, we derive bosonisation rules in this formalism. A system which is studied extensively in the thesis is the charged relativistic boson gas in an external magnetic field. We discuss its thermal properties as well as the properties of the ground state (vacuum). It is found that the magnetisation of the vacuum dominates over the thermal magnetisation at magnetic fields strong enough. The question of condensation in a magnetic field is also addressed. It is verified that `true' Bose-Einstein condensation is impossible in a magnetic field, no matter how weak. However, since there are no discontinuities in the real world, it is shown that the question is somewhat academical. Finally, we review and study compact charged boson stars. It is shown that the vacuum in the presence of a very compact star is unstable and particles are produced. Numerical evidence for a complete screening of the star by the produced particles is found
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