1,720,979 research outputs found
Strong excess risk of pancreatic cancer for low frequency and duration of cigarette smoking: A comprehensive review and meta-analysis
No full textDose-risk relationships between cigarette smoking and ovarian cancer histotypes: a comprehensive meta-analysis
No full textAlthough smoking has not been associated with overall ovarian cancer risk, a different impact on various histotypes has been reported. Our aim is to provide an accurate, up-to-date estimate of the dose-risk relationships between cigarette smoking and epithelial ovarian cancer, overall and by histotypes
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
Correlators on the Wilson Line Defect CFT
Full text linkConformal field theory (CFT) plays a key role in modern theoretical physics.
Through CFT we describe real physical systems at criticality and fixed points
of the renormalization group flow. It is also central in the study of quantum
gravity, thanks to the AdS/CFT correspondence. This thesis originates in the
context of the N=4 supersymmetric Yang-Mills (SYM) theory, which represents the
CFT side of this correspondence. This work mainly revolves around the
supersymmetric Wilson line and its interpretation as a conformal defect in N=4
SYM. Particularly, we focus on excitations localized on the defect called
insertions, whose correlators are described by a one-dimensional CFT. The first
main result of this work is an efficient algorithm for computing multipoint
correlation functions of scalar insertions on the Wilson line, consisting of
recursion relations up to next-to-leading order at weak coupling. We show
various computations of such four-, five- and six-point correlators, and
discuss their properties. Moreover, we use the four-point function case to
illustrate the power of the Ward identities, which are crucial in deriving a
next-to-next-to-leading order result. Thanks to these perturbative results, we
find a family of differential operators annihilating our correlation functions,
which we conjecture to be a multipoint extension of the Ward identities
satisfied by the four-point functions. These non-perturbative constraints are
shown to be fundamental ingredients in the bootstrap of a five-point function
at strong coupling. To conclude, we define an inherently one-dimensional Mellin
amplitude at the non-perturbative level with appropriate subtractions and
analytical continuations. The efficiency of the 1d Mellin formalism is manifest
at the perturbative level. We find a closed-form expression for the Mellin
transform of leading order contact interactions and use it to extract CFT data.Comment: 162 pages, PhD thesis; v
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