1,720,983 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
A method of precise calibration for piezoelectrical actuators
No full textPiezoelectrical actuators are very useful for making translations over distance less than 10 µm. One of the most important applications of such piezo actuators is the scanning tunnelling microscopy and the related scanning probe microscopies because atomic scale distances have to be measured and controlled in scanning probe microscopies applications. Especially, tube shaped piezoelectrical actuators have been widely used for such purposes. In this study, a piezotube scanner is calibrated at three stages. First calibration was done by using interferometer. At the other two stages Scanning Tunnelling Microscope was used for measurement
Laser–Material Interaction Dynamics and Surface Topography Optimization on ST52 Steel: Correlation Between Friction Coefficient and Maximum Valley Depth (Sv)
No full textTo produce a surface morphology with a minimumfriction coefficient and maximal valley depth (Sv), this study explores theoptimization of laser surface texturing parameters on ST52 structural steel. Todetermine the physical relationship between frictional behavior and surfacetopography, controlled adjustments in laser power, scanning area ratio, andpattern shape (square, diamond, hexagonal, and circular) were used to createmicron-scale roughness. The resulting surfaces were then examined. The Taguchimethod-based experimental design made it possible to identify statisticallysignificant variables affecting Sv and the coefficient of friction. Thefindings showed that pattern shape (33.58%) and scanning area (30.66%) were thenext most significant contributors to frictional performance, after laser power(35.75%).The maximum Sv value of about 1100 µm, which corresponds to the lowestfriction coefficient, was generated by the ideal combination of diamondpattern, 20% scanning area, and 40 W laser power. These results can beexplained by the nonlinear interaction between transient heat transport in thesubstrate and localized energy absorption, which controls the dynamics ofresolidification and ablation depth. While excessive thermal input encouragessurface smoothing through viscous flow, lower power levels favor deeper micro-valleyformation due to less melt convection. The resulting high-Sv topology reducesreal contact area and improves lubricant retention, which lowers interfacialshear stresses. These results show that laser texturing is a potent method forcreating sophisticated tribological surfaces with great efficiency anddurability because careful manipulation of laser parameters allowsdeterministic control of surface energy, frictional dissipation, andtopographical anisotropy.This abstract presents a comprehensive study of [yourmathematical topic]. We investigate the fundamental properties of [mathematicalobjects/concepts] and establish new theoretical results that extend previouswork in the field. Our main contributions include: (1) the development of anovel mathematical framework for [specific problem], (2) the proof of [specifictheorem/result], and (3) applications to [practical applications]. </p
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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