1,720,998 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
Effect of process parameters on the surface crack density of AISI 304 in PMEDM
No full text
Purpose
In this study, powder mixed electro discharge machining (PMEDM) has been performed for the machining of AISI 304 stainless steel by using the tungsten carbide electrode when silicon carbide (SiC) powder is mixed with kerosene. The purpose of this study is to find the optimal value and ascertain the effect of significant machining parameters on surface crack density (SCD) of a machined surface of AISI 304.
Design/methodology/approach
A face-centered central composite design-based response surface methodology has been adopted for designing this experiment.
Findings
An increase in peak current and powder concentration decreases SCD, which is the main goal of this investigation.
Originality/value
From this investigation, an optimal value has been achieved to minimize the SCD and prevent fatigue and corrosion resistance of the workpiece.
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Effect of Process Parameters and Cryotreated Post Tempered Electrodes on the Radial Overcut of AISI 304 During EDM: A Comparative Study
No full textEffect of different tool materials during EDM performance of titanium grade 6 alloy
No full textDuring this investigation, a comparative study has been carried out on electro discharge machining (EDM) of titanium grade 6 alloy using different type of electrodes viz. copper, brass and zinc. The process performance has been assessed by means of material removal rate (MRR) and tool wear rate (TWR). A face-centered central composite design (FCCCD) based response surface methodology (RSM) has been implemented to design the experiment. The influence of process parameters viz. pulse on time, peak current, gap voltage and duty cycle on the process performance has been studied. Metallographic analysis was carried out for the machined surfaces. Higher material removal rate is attained by brass and zinc electrodes compared to copper electrode. Copper electrode exhibits less tool wear and less recast layer, followed by brass and zinc electrodes. Keywords: Electro discharge machining, Material removal rate, Recast layer, Titanium grade 6 alloy, Tool wear rat
Application potential of combined fuzzy-TOPSIS approach in minimization of surface roughness, cutting force and tool wear during machining of CP-Ti grade II
No full textMulti-Response Optimization of WEDM Process Parameters Using Taguchi Based Desirability Function Analysis
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