1,721,009 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
Curr Opin Pulm Med
Get PDFPurpose of reviewMilitary personnel deployed to Southwest Asia and Afghanistan were potentially exposed to high levels of fine particulate matter and other pollutants from multiple sources, including dust storms, burn pit emissions from open-air waste burning, local ambient air pollution, and a range of military service-related activities that can generate airborne exposures. These exposures, individually or in combination, can have adverse respiratory health effects. We review exposures and potential health impacts, providing a framework for evaluation.Recent findingsParticulate matter exposures during deployment exceeded U.S. National Ambient Air Quality Standards. Epidemiologic studies and case series suggest that in postdeployment Veterans with respiratory symptoms, asthma is the most commonly diagnosed illness. Small airway abnormalities, most notably particularly constrictive bronchiolitis, have been reported in a small number of deployers, but many are left without an established diagnosis for their respiratory symptoms. The Promise to Address Comprehensive Toxics Act was enacted to provide care for conditions presumed to be related to deployment exposures. Rigorous study of long-term postdeployment health has been limited.SummaryVeterans postdeployment to Southwest Asia and Afghanistan with respiratory symptoms should undergo an exposure assessment and comprehensive medical evaluation. If required, more advanced diagnostic considerations should be utilized in a setting that can provide multidisciplinary expertise and long-term follow-up.I01 BX004619/BX/BLRD VAUnited States/T42 OH008429/OH/NIOSH CDC HHSUnited States/VA999999/ImVA/Intramural VAUnited States
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
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Exposure Characterization and Prediction of Ambient Particulate Matter: From Boston to the Middle East
Get PDFChapter one of this manuscript identifies the sources, composition, and temporal variability of fine (PM2.5) and coarse (PM2.5-10) particles. A Harvard Impactor was used to collect daily particle samples from 2002-2010 at a single site in Boston, MA. Filters were analyzed for elements, black carbon (BC), and total PM mass. Positive Matrix Factorization (PMF) identified BC, S, Pb, V, and Ni to be associated mostly with the fine particle mode, and Ca, Mn (road dust), and Cl (sea salt) mostly with the coarse mode. PMF identified six source types for PM2.5, including regional pollution (48%), motor vehicles (21%), wood burning (19%), oil combustion (8%), crustal/road dust (4%), and sea salt (<1%). Three source types were identified for PM2.5-10, including crustal/road dust (62%), motor vehicles (22%), and sea salt (16%). A linear decrease in PM concentrations with time was observed for both fine (-5.2%/yr) and coarse (-3.6%/yr) particles. That PM2.5 is decreasing more sharply than PM2.5-10 over time suggests the increasing importance of PM2.5-10 and traffic-related sources for PM exposure and future policies.
Chapters two and three use variables related to PM2.5 concentrations to quantify PM2.5 exposure where PM monitoring does not exist. In chapter two, validation of a model calibrating the PM2.5-visibility relationship using data collected in Kuwait from 2004-2005 demonstrated the ability to predict PM2.5 exposure at monitoring sites. In chapter three, validation of a model calibrating the visibility-AOD relationship using data collected from 2006-2007 in Iraq demonstrated the ability to predict visibility between monitoring sites at a fine resolution (1x1 km), and in turn estimate PM2.5 spatially. Applying these relationships to predict PM2.5 at locations exterior to the calibration sites showed high temporal and spatial variability in PM2.5 exposure (10-365 µg/m3).
The ability to obtain precise estimates of PM2.5 concentrations in Southwest Asia and Afghanistan is of high utility for epidemiologists seeking to understand the relationship between chronic PM2.5 exposure and respiratory diseases among deployed military personnel stationed throughout the region. That predicted PM2.5 varies widely over space and time supports the ability to successfully utilize our estimates to understand this relationship in the region.air pollution; pm; particulate matter; exposure; source apportionmen
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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