1,720,965 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
Prufer intersection of valuation domains of a field of rational functions
Full text linkLet be a rank one valuation domain with quotient field . We characterize the subsets of for which the ring of integer-valued polynomials \Int(S,V)=\{f\in K[X] \mid f(S)\subseteq V\} is a Pr\"ufer domain. The characterization is obtained by means of the notion of pseudo-monotone sequence and pseudo-limit in the sense of Chabert, which generalize the classical notions of pseudo-convergent sequence and pseudo-limit by Ostrowski and Kaplansky, respectively. We show that \Int(S,V) is Pr\"ufer if and only if no element of the algebraic closure of is a pseudo-limit of a pseudo-monotone sequence contained in , with respect to some extension of to . This result expands a recent result by Loper and Werner
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
Stacked Pseudo-Convergent Sequences and Polynomial Dedekind Domains
Full text linkLet be a prime, \oQp a fixed algebraic closure of the field of -adic numbers and \oZp the absolute integral closure of the ring of -adic integers. Given a residually algebraic torsion extension of to \Q(X), by Kaplansky's characterization of immediate extensions of valued fields, there exists a pseudo-convergent sequence of transcendental type E=\{s_n\}_{n\in\N}\subset\oQp such that W=\Z_{(p),E}=\{\phi\in\Q(X)\mid\phi(s_n)\in\oZp,\text{ for all sufficiently large }n\in\N\}. We show here that we may assume that is stacked, in the sense that, for each , the residue field (the value group, respectively) of \oZp\cap\Q_p(s_n) is contained in the residue field (the value group, respectively) of \oZp\cap\Q_p(s_{n+1}); this property of allows us to describe the residue field and value group of .
In particular, if is a DVR, then there exists in the completion \C_p of \oQp, transcendental over \Q, such that W=\Z_{(p),\alpha}=\{\phi\in\Q(X)\mid\phi(\alpha)\in \O_p\}, where \O_p is the unique local ring of \C_p; belongs to \oQp if and only if the residue field extension is finite. As an application, we provide a full characterization of the Dedekind domains between and \Q[X]
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
The Zariski-Riemann space of valuation domains associated to pseudo-convergent sequences
Full text linkLet V be a valuation domain with quotient eld K. Given a pseudoconvergent sequence E in K, we study two constructions associating to E a valuation domain of K(X) lying over V, especially when V has rank one. The rst one has been introduced by Ostrowski, the second one more recently by Loper and Werner. We describe the main properties of these valuation domains, and we give a notion of equivalence on the set of pseudo-convergent sequences of K characterizing when the associated valuation domains are equal. Then, we analyze the topological properties of the Zariski-Riemann spaces formed by these valuation domains
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