1,720,975 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
Evaluation of the efficiency of an ultrasonic atomization-based coolant (uACF) spray system in external turning using different nozzle tips
No full text© 2022 The Society of Manufacturing EngineersRecently, the atomization-based coolant (ACF) spray system has shown promising cooling and lubrication effects in machining, but its effectiveness on machining processes has not yet been adequately studied. This paper proposes a new compact system which is developed based on the ultrasonic atomization of metalworking fluid used in machining and called the Ultrasonic Atomization-based Cutting Fluid (uACF) spray system. This study aims that, on turning AISI 1050 plain carbon steel, the effectiveness of the uACF spray system made with simple, economical, and accessible equipment is evaluated by comparing it with different cooling conditions. In this study, three different nozzle outlet tips called long wide nozzle (LWN), long narrow nozzle (LNN), and flat wide nozzle (FWN) have been used in the uACF system. Several experiments have been conducted to study the effects of the nozzle outlet tips on performance characteristics such as the main cutting force (Fc), cutting temperature (Tc), average surface roughness (Ra), and chip compression ratio (ζ). In addition, similar tests were also made for dry (DRY), compressed air (AIR), and dense coolant spraying (SPR) conditions and the test results were compared with each other. It was determined that there were statistically significant differences between the conditions of the uACF system and other classical cooling conditions. The uACF system created significant differences, especially in Fc and Tc. It was determined that the use of FWN in the uACF system was more effective than SPR on Fc, and was as effective as SPR on Tc. While the fluid consumption rate of FWN in the uACF system is 1.5 ml/min, the SPR has a fluid consumption of 20 ml/min. It has been found that the uACF spray system with a lower fluid consumption outperforms other cooling conditions, thus further enhancing the performance of the environmentally friendly production process. The effectiveness and potential of the uACF spray system on machining processes possess high efficiency and cost-effective benefits to substitute the traditional cooling-lubrication applications. The results obtained from this study have the potential to be helpful to other researchers for a similar type of study and a guide for further research on the development of different cooling systems
Metallurgical and mechanical properties of Ti-24Nb-4Zr-8Sn alloy fabricated by metal injection molding
No full textMetastable beta-titanium alloys are especially favourable as implant materials because this type of Ti alloy containing beta stabilising elements such as Nb, Zr and Ta has an excellent combination of low modulus, high strength, corrosion resistance and biocompatibility. A low elastic modulus reduces the risk of stress shielding and associated bone resorption. The difficulty of producing complex shapes of these alloys by conventional methods for reasonable costs makes Metal Injection Moulding (MIM) attractive. In this work, the results of using MIM to process successfully Ti-24Nb-4Zr-8Sn alloy powder are presented. Specimens with relative density up to 97.6% have been produced using a feedstock based on wax-polymer binder. Microstructure observations reveal a pure beta microstructure with TixC precipitates along the grain boundaries. The carbides form due to reaction of titanium with binder residuals and deteriorate the plastic behaviour. However, the specimens exhibit an ultimate tensile strength within the range from 655 to 720 MPa and a plastic elongation ranging between 2% and 9% in dependence on sintering parameters. The lowest Young's modulus is about 54 GPa and this value is about 50% lower than that of CP Ti and Ti-6Al-4V. (C) 2014 Elsevier B.V. All rights reserved
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
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