1,726,336 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
Friction and wear behavior of magnetron co-sputtered V-Si-N coatings
No full textCutting tool life can be extended by using coatings, and that presents many opportunities to reduce manufacturing cost. In this study, V-Si-N coatings with 3.1 and 4.4 at% Si were prepared on high speed steel substrates (HSS) by reactive magnetron co-sputtering deposition. In addition to characterizing the microstructure, mechanical properties, and coating adhesion, the sliding friction and wear behavior were investigated. The V-Si-N coatings exhibited a dense growth structure, high nano-indentation hardness ( > 30 GPa) and good scratch adhesion (critical load > 80 N). Unlubricated ball-on-plate tribological tests were performed against Al2O3 or WC-Co counterparts at room temperature. Wear tracks were characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), and energy-dispersive X-ray spectrometry (EDX). Under a normal load of 5 N, the friction coefficients against Al2O3 or WC-Co were less than 0.5, and the specific wear rates were in the range of 10(-8) mm(3)/N m. There was no obvious effect of relative humidity (RH) on the friction and wear behavior in the range of 30-80% RH. Mild wear continued up to similar to 10(5) sliding cycles, corresponding to a layer-by-layer removal mechanism. When the load was doubled to 10 N, a transition from mild to severe wear occurred after about 10(4) sliding cycles. Cracking and spallation increased at this point. It is suggested that a combination of rich V content and nanocomposite microstructure favors the excellent wear resistance of Vi-Si-N hard coatings. (C) 2014 Elsevier B.V. All rights reserved
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
Physico-mechanical and tribological properties of nanocomposite coatings Zr-Ti-Si-N, Ti-Hf-Si-N
No full textИзучены механические и триботехнические сравнительные характеристики нанокомпозитных покрытий Zr-Ti-Si-N и Ti-Hf-Si-N. Покрытия Ti-Hf-Si-N обладают высокой твердостью Н = (48,4 ± 1,4) ГПa и модулем упругости Е = (520 ± 12) ГПа. Установлено, что коэффициент трения для покрытий Ti-Hf-Si-N составляет 0,736, а для Zr-Ti-Si-N – 0,705.Вивчено механічні та триботехнічні порівняльні характеристики нанокомпозитних покриттів Zr-Ti-Si-N і Ti-Hf-Si-N. Покриття Ti-Hf-Si-N мають високу твердість Н = (48,4 ± 1,4) ГПa і модуль пружності Е = (520 ± 12) ГПа. Встановлено, що коефіцієнт тертя для покриттів Ti-Hf-Si-N становить 0,736, а для Zr-Ti-Si-N –0,705.Studied the mechanical and tribological characteristics of nanocomposite coatings comparative Zr-Ti-Si-N and Ti-Hf-Si-N. Coating Ti-Hf-Si-N have high hardness H = (48,4 ± 1,4) GPa, the modulus of elasticity E = (520 ± 12) GPa. It is established that the coefficient of friction for coating Ti-Hf-Si-N is 0.736, while for Zr-Ti-Si-N - 0,705.Работа выполнена в рамках научно-исследовательской работы, финансируемой Министерством образования и науки, молодежи и спорта Украины, номер государственной регистрации 0110U001257
Physico-mechanical and tribological properties of nanocomposite coatings Zr-Ti-Si-N, Ti-Hf-Si-N
Get PDFИзучены механические и триботехнические сравнительные характеристики нанокомпозитных покрытий Zr-Ti-Si-N и Ti-Hf-Si-N. Покрытия Ti-Hf-Si-N обладают высокой твердостью Н = (48,4 ± 1,4) ГПa и модулем упругости Е = (520 ± 12) ГПа. Установлено, что коэффициент трения для покрытий Ti-Hf-Si-N составляет 0,736, а для Zr-Ti-Si-N – 0,705.Вивчено механічні та триботехнічні порівняльні характеристики нанокомпозитних покриттів Zr-Ti-Si-N і Ti-Hf-Si-N. Покриття Ti-Hf-Si-N мають високу твердість Н = (48,4 ± 1,4) ГПa і модуль пружності Е = (520 ± 12) ГПа. Встановлено, що коефіцієнт тертя для покриттів Ti-Hf-Si-N становить 0,736, а для Zr-Ti-Si-N –0,705.Studied the mechanical and tribological characteristics of nanocomposite coatings comparative Zr-Ti-Si-N and Ti-Hf-Si-N. Coating Ti-Hf-Si-N have high hardness H = (48,4 ± 1,4) GPa, the modulus of elasticity E = (520 ± 12) GPa. It is established that the coefficient of friction for coating Ti-Hf-Si-N is 0.736, while for Zr-Ti-Si-N - 0,705.Работа выполнена в рамках научно-исследовательской работы, финансируемой Министерством образования и науки, молодежи и спорта Украины, номер государственной регистрации 0110U001257
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