1,720,956 research outputs found
Effect of use of filler wire on requirements of laser welded butt joints
No full textThe number of industrial applications of laser welding is growing steadily, due to the advantages provided over conventional welding processes. However, the manufacture of a sufficiently narrow and uniform air gap in the joint is a severe problem which must be overcome for industrialisation of the process. This study discusses the benefits provided by the use of filler wire in laser welding of a butt joint in plain carbon steel. Welding with a wire requires an increase in heat input, which is a function of air gap width, due to the larger melt volume produced. Feeding tolerances for the filler wire are less than 0.5 mm. When welding with the maximum laser power available, sustaining the highest production rate, the welding speed must be decreased and the wire feed rate increased when the air gap is increased. This decreasing trend is similar at all power levels and material thicknesses. The use of filler wire laser welding allows an air gap between the plates to be tolerated, in best cases up to 1.6 mm for a 3 mm plate thickness, and 2.5 mm for 8 mm thick plate. The limits of mismatch are determined by standards and not by the welding process. Filler wire laser welding allows the joint edge to be manufactured by machining, laser cutting and mechanical shearing. Welding of shear cut edges creates welds with some undercut due to joint manufacture, but the quality is still acceptable according to standard proposals. In practice filler wire addition increases the tolerances of a butt joint by about 10 times in comparison with autogenous laser welding
Oral History Interview with Dr. Dwayne McCay
No full textAn interview with Dr. Dwayne McCay, who served as President of Florida Institute of Technology from 2016 to 2022. The interview covers his leadership philosophy, his vision for the university, key decisions made during his tenure, and his reflections on the university\u27s past and future
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
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
Chemical kinetic performance losses for a hydrogen laser thermal thruster
Get PDFPeer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/77288/1/AIAA-25927-132.pd
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