1,720,956 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
QSAR моделирование блокады NMDA рецептора полифармакофорными соединениями на основе производных карбазола и 1-аминоадамантана
Get PDFWe investigated 14 compounds causing the NMDA receptor blockage. These polypharmacophoric compounds are conjugates of carbazole, tetrahydrocarbazole and 1-aminoadamantane derivatives. As a measure of biological activity of the compound tested, the IC50 (μM) value, reflecting 50% inhibition of [H3] MK-801 binding to the NMDA receptor, was used. The regression model with satisfactory statistical characteristics was obtained as a result of the QSAR modeling based on the Gaussian process.В работе исследован ряд из 14 соединений, вызывающих блокаду NMDA рецептора. Эти полифармакофорные соединения представляют собой конъюгаты производных карбазола, тетрагидрокарбазола и 1-аминоадамантана. В качестве меры биологической активности использовали величину IC50 (мкМ) – концентрацию, при которой наблюдается 50% торможение исследуемым соединением связывания [H3]MK-801 с NMDA рецептором. В результате проведения QSAR моделирования на основе Гауссовского процесса получена регрессионная модель с удовлетворительными статистическими характеристиками
Расчет и анализ фрактальных дескрипторов для белковых аминокислот в различных конформационных состояниях
No full textA series of 20 proteinogenic amino acids was studied. Four types of fractal descriptors for 2 conformational states are calculated: α-helix and 1-strand β-sheet. Based on the analysis of the results obtained, it is established that when the conformational state of the amino acids (α-helix→β-sheet) changes, significant changes in the fractal descriptor Dtot, in the calculation of which all the atoms of the molecule are used, are not observed. However, the more specific descriptors Dval, Dvdw and Dunb, which reflect the aggregate of valence-coupled, van der Waals contact and unbound atoms, respectively, are more sensitive to the conformational transition. The increase Dval, Dvdw and the decrease Dunb values were established for a series of 7 amino acids.Изучен ряд из 20 белковых аминокислот. Рассчитаны 4 типа фрактальных дескрипторов для 2-х конформационных состояний: α-спираль и одноцепочечная альфа-структура. На основе анализа полученных результатов установлено, что при изменении конформационного состояния аминокислот (α-спираль→β-структура) значимых изменений во фрактальном дескрипторе Dtot, при расчёте которого используются все атомы молекулы, не наблюдается. Однако, более специфические дескрипторы Dval, Dvdw и Dunb, которые отражают совокупность валентно связанных, находящихся в ван-дер-ваальсовом контакте и несвязанных атомов соответственно, оказываются более чувствительными к конформационному переходу. Для ряда из 7 аминокислот установлен рост величин Dval, Dvdw и падение величины Dunb
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
