1,724,530 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
Status refinement of metal-poor star HD 6268
No full textMetal-poor stars in the Galaxy enable
observations of the light and neutron-capture (n-capture)
elements produced by their progenitors and deduction of
the characteristics of the early Galaxy from the elemental
abundances in these stars. Stars with deficiency of metals
([Fe/H] < –2) vary significantly in their chemical composition,
in particular, in their content of CNO elements, as
well as the iron-peak and n-capture elements. A detailed
study of the elemental abundances in these stars makes it
possible to test experimental models of stellar evolution,
nucleosynthesis, homogeneity (the degree of mixing) of
interstellar matter, etc., at low metallicity in the Galaxy.
The metal-poor star HD 6268 with [Fe/H] close to –
2.5 and low carbon abundance was selected as a target one
for this study. The spectral material was collected using
the Southern African Large Telescope (SALT) fibre-fed
echelle-spectrograph HRS in the medium resolution mode
(R~31000-41000) with a high S/N ratio near 100-200
within the range from 3900 to 8700 ÅÅ. The atmospheric
stellar parameters and abundances of 30 chemical elements
in the metal-poor star HD 6268 were determined
under the LTE approximation using the atmosphere models
by Kurucz & Castelli (2003), as well as the equivalent
widths EWs and WIDH9 code developed by Kurucz. The
abundances of C, Na, Mg, K, Ba, La, Ce, Pr, Sm and Eu
were obtained by the synthetic spectrum method factoring
in the hyperfine structure (HFS) for the Eu II line 4129 A.
The carbon abundance was determined by the molecular
synthesis fitting in the region of CH (4300-4330 ÅÅ). For
the abundances of Na, Mg, K and Ba, we applied the
NLTE corrections.
As a result, we found out that the abundances of C and
N confirm their changes associated with canonical extra
mixing proposed by Denissenkov & Pinsonneault (2008).
The Na-O correlation is open to question unlike the Na-Si
correlation which is likely to exist. The Al-Mg and Al-Na
correlations are consistent with the data obtained for the
field giants with [C/Fe] < –0.5 (Roederer et al., 2014).
According to the distribution of elements depending on
their atomic numbers in the atmosphere of HD 6268, it is
a metal-poor main r-process enriched star.Бідні металами зорі Галактики дають
змогу спостерігати легкі елементи та елементи
нейтронного захвату, що вироблені їхніми зорями-
попередниками, і через їх вміст вивести характеристики ранньої Галактики. Зорі з дефіцитом металів
([Fe/H]<–2) показують помітну різноманітність
хімічного складу, це стосується як CNO-елементів, так
і елементів залізного піку та n-захвату. Детальне вивчення вмісту елементів у цих зорях дозволяє перевіряти (тестувати) моделі зоряної еволюції, нуклеосинтезу, однорідності (ступінь змішування) міжзоряної речовини тощо при низькій металічності в Галактиці.
Малометаллічна зоря HD 6268 з [Fe/H] близько -2,5 і
малим вмістом вуглецю була вибраноа для нашого дослідження. Спектральний матеріал був отриманий з
ешеле-спектрографом HRS, який розміщений на
Південно-Африканському Великому Телескопі (SALT)
в режимі середньої роздільної здатності (R ~ 31000-
41000) з високим співвідношенням сигнал/шум (S/N
близько 100-200) у діапазоні від 3900 до 8700 АА.
Зоряні параметри та вміст 30 хімічних елементів в
атмосфері HD 6268 були визначені в наближенні локальної термодинамічної рівноваги (ЛТР),
використовуючи моделі атмосфери Куруца та Кастеллі
(2003), еквівалентні ширини EW ліній та код WIDH9
Куруча. Вміст C, Na, Mg, K, Ba, La, Ce, Pr, Sm, Eu,
отримано методом синтетичного спектру з
урахуванням надтонкої структури (HFS) для лінії Eu II
4129 A. Вміст вуглецю визначався за молекулярним
синтезом пристосування профілей в районі СН (4300-
4330 А). Для вмісту Na, Mg, K, Ba ми використовували
виправлення (корекції) за рахунок відхилень від ЛТР.
З отриманих результатів було виявлено, що вмісти
вуглецю C і та азоту N підтверджують, що зміни їх
вмісту відбулися шляхом канонічного додаткового
змішування, запропонованого Денисенковим і Пінсоннео (2008); наявність співвідношення Na-O під
сумнівом, на відміну від співвідношення Na-Si, що
може бути. Відношення Al-Mg, Al-Na співпадають з
даними, отриманими для гігантів галактичного поля з
[C/Fe] <–0.5 (Roederer et al., 2014).
HD 6268 є зорею, яка демонструє збагачення основним r-процесом відповідно до розподілу вмісту елементів з атомним номером в її атмосфері
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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