1,720,974 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
A Whale as Old as Time
Get PDFDette prosjektet har som hensikt å demonstrere relevansen av å datere hvalbein fra arkeologisk kontekst og viktigheten av å benytte en artsspesifikk ∆R. Samt teste teorien at proteinet og fettet fra hvalbein vil gi ulike dateringer. Målet med oppgaven vil derfor være å radiokarbon datere kollagenet og lipidene tatt fra 20 beinprøver hentet fra de tre hvalartene Nordkaper (Eubalaena glacialis), Grønlandshval (Balaena mysticetus), og Gråhval (Eschrichtius robustus).
Når bein fra sjøpattedyr blir datert må det tas hensyn til marin reservoar effekten. Marin reservoareffekten varierer i både tid og rom, og det finnes også variasjon innad ulike arter. Dermed er det nødvendig å benytte lokale kalibreringsverdier kalt ∆R for å få korrekte dateringer. Ved å benytte en Grønlandshval prøve tatt fra kontekst hvor bruksperioden er kjent var det mulig å etablere en arts spesifikk ∆R verdi. Denne verdien er uttrykt som intervallet (-225, -20) eller som (-124 ± 59). Denne gjorde det mulig å korrigere Grønlandshval dateringene.
En annen faktor å vurdere er forfalsshastigheten til materialet som blir datert. Dette er spesielt relevant under datering av langlevende arter, slik som Grønlandshvalen. Proteinet, eller kollagenet, vil ha en betydelig innebygd alder som et resultat av hvalens alder. Mens fettet, eller lipidene, har en hurtigere forfalsshastighet og reflekterer tiden hvalen døde. Å sammenligne dateringen av disse har potensialet til å gi ny innsikt inn i hvordan alderen til arten påvirker dateringen. Lipid ekstraksjonen var vellykket på 7 av prøvene, men dateringene var langt eldre enn hva som skulle vært mulig. FTIR-spektroskopi viste at dette var grunnet finkornet sediment i prøven ble datert i stedet for lipidene. Derfor var det ikke mulig å sammenligne dateringene. Resultatet av dette prosjektet ble 19 daterte kollagenprøver. Seks av disse tilhørte Grønlandshvalen som ble ∆R korrigert og plassert i historisk kontekst. Forskjellen i resultatene før og etter ∆R-korrigering viser viktigheten av å benytte artsspesifikk ∆R.This thesis aims to demonstrate the relevance of radiocarbon dating whale bones discovered in archaeological contexts and the significance of a species-specific ∆R. It also aims to test the theory that whale bones’ protein and fat content would provide different ages. Its goal is, therefore, to radiocarbon date the collagen and lipid of 20 bone samples collected from the three species North Atlantic Right Whale (Eubalaena glacialis), Bowhead Whale (Balaena mysticetus), and North Atlantic Gray Whale (Eschrichtius robustus).
When radiocarbon dating the bones of marine mammals, you must take into account the marine reservoir effect. The marine reservoir effect varies temporally and spatially, and there is also variation within marine species. So, local corrections expressed as ∆R are necessary in order to get correct calendar dates. By using a Bowhead Whale from a known age context, it was possible to establish a species-specific ∆R value expressed as the interval ( -225, -20) or as (-124 ± 59). With this ∆R correction, it was possible to correct the dates of all the Bowhead samples.
Another thing to consider when radiocarbon dating is the turnover rate of the material that gets dated. This will be especially important to consider when dating long-lived species, such as some species of whale like the Bowhead Whale. The protein, or collagen, will have a significant inherent age due to the old age of the whale, whilst the fat, or lipid, is likely to have a fast turnover rate and reflect the time the whale died. Comparing the date of these two fractions has the possibility to provide insight into how the lifespan of a species affects its dating. While the lipid extraction was successful with 7 samples, they all resulted in significantly older dates than should have been possible. FTIR-spectroscopy showed that this is most likely due to finely-grained sediments being dated and not the actual lipid. Therefore, it was not possible to compare the fractions. The result of this project was 19 successfully dated collagen samples. Six of these were Bowheads and got ∆R corrected and placed in a historical context. The difference in dating results before and after ∆R correcting shows the significance of a species-specific ∆R
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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