1,722,108 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
Full text linkWe 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
Microstructural evolution of tungsten under thermal loads: A comparative study between cyclic high heat flux loading and isochronous furnace heating
Full text linkRecrystallization is one of the most pronounced microstructural changes of tungsten when subjected to cyclic high heat flux (HHF) loads. In the framework of the European DEMO divertor development an intensive R&D programme is being performed. Many HHF tests of tungsten monoblocks have shown that recrystallization and grain growth have been deemed a major degradation feature leading to brittleness and reduced strength. In the previous recrystallization studies, tungsten was normally heat-treated in a furnace in slow uniform heating. However, in a HHF test or in the assumed fusion reactor operation, the water-cooled tungsten armor is rapidly heated by cyclic HHF pulses generating a steep temperature gradient (20 MW/m2 loading results in about 200 K/mm) and thermal stresses. This difference raises the question as to whether a furnace heat-treatment condition properly simulates the cyclic HHF loading case in terms of recrystallization behaviour if the heat exposure conditions are kept comparable to each other. The present paper addresses this issue. To this end, a comparative microstructural study was performed for two different groups of tungsten samples: one tested under well-defined furnace heat-treatment conditions (1500 °C, 2100 °C) and the other one taken from the monoblocks (at the positions of the same corresponding temperatures) of a water-cooled mock-up tested under HHF loads at 20 MW/m2, 500 cycles. Extensive quantitative image analysis was carried out based on detailed microstructural and crystallographic characterization and micro-hardness was measured. The HHF loaded surface is dominated by the formation of extremely large grains in contrast to furnace heating at the same temperature. The samples heated at 2100 °C exhibited a remarkable difference in recrystallization and grain growth behaviour and hardness values between the two heating cases. Two commercial tungsten grades (AT&M, ALMT) showed a similar behaviour to each other
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
High-heat-flux performance limit of tungsten monoblock targets: Impact on the armor materials and implications for power exhaust capacity
No full textDevelopment of a reliable high-heat-flux (HHF) technology is one of the crucial requirements of power exhaust strategy for a fusion reactor. The baseline HHF technology of the EU-DEMO, which inherited mostly the ITER technology, is based on the tungsten monoblock design and hot radial pressing joining technique. Thermal resilience and structural integrity under all off-normal transient events foreseen are essential prerequisites for validation of the technology towards the demonstration of full-scale prototype manufacture. Hence, the HHF performance of the baseline technology needs to be evaluated also in the transient overload regime. To this end, we conducted an extensive HHF testing campaign using small-scale test mock-ups of the tungsten monoblock target for two slow (10 s) overloads at 20 MW/m2 (up to 2000 pulses) and 25 MW/m2 (1000 pulses), and for a short (0.4 s) overload at 40 MW/m2 (5000 pulses). Furthermore, excessive heat loads (32–37 MW/m2) were applied beyond the armor melting event to test the structural stability at limit loads. IR thermography, ultrasonic inspection and electron microscopy (EBSD) delivered direct information and insight on the structural integrity and the impact on the armor microstructure. It was found that the tungsten monoblock target remained fully intact at least up to 1000 heating cycles at 20 MW/m2 (10 s) and survived 2000 cycles without any major failure. At 25 MW/m2 (10 s), the mock-ups remained nearly intact at least up to 500 heating cycles and survived 1000 cycles without critical failure. However, the armor surface showed substantial deformation roughening with the height of 1000 μm after 1000 cycles. At 40 MW/m2 with short pulses (0.4 s), the mock-ups remained fully intact without any serious damage at least up to 5000 cycles. The mock-ups even withstood the limit heat load of 32 MW/m2 at least for a few pulses. Under excessive overloads (33–37 MW/m2) above the critical incident heat flux, armor melting preceded any other potential failures (e.g. pipe rupture by coolant boiling)
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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