1,721,029 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
A Novel Tribometer and a Comprehensive Testing Method for Rolling-Sliding Conditions
Full text linkThis study introduces a method based on fine torque control to evaluate traction in rolling—liding line contacts under small slide-to-roll ratios (SRRs). To accomplish this, we engineered an innovative testing machine—a two-roller tribometer capable of precisely applying resisting torques to one of the rollers. Two types of tests were designed and conducted to validate our method and showcase the capabilities of the novel test setup. The first type, named the “Traction Decay Test”, proved to be effective in evaluating changes in the SRR over time. The second, named the “Torque-Mode Traction Test”, demonstrated its effectiveness in achieving ultra-low SRRs, in the order of 0.01%. As a result, traction curves with high resolution in the low SRR domain were constructed. This advancement provides the means for gaining a deeper understanding of traction coefficients, wear behavior, and tribological performance at ultra-low SRRs across diverse applications.Mechatronic Systems Desig
Experimental analysis of contact forces between strands in three-strand ropes with varying twist parameters and filament counts
Full text linkAramid fiber ropes are widely used, owing to their high strength and abrasion resistance. Calculating the contact force in these ropes at the interface of the strand–strand contact is essential in understanding their internal degradation and predicting their lifetime. The energy required to induce this degradation is the product of both the contact forces and displacements at the strand–strand interface. This paper presents a novel approach to measure and compute the contact force at the strand–strand interface inside three-strand aramid fiber ropes under tensile loading by using pressure films between strands to measure contact pressure and contact width. The contact forces, calculated from these measurements, enable us to validate an analytical model. The effects of the geometrical parameters of the rope, such as rope twist, strand twist, and the number of filaments in the strand, on the contact force between strands are also investigated. Our study shows that increasing rope twist increases contact force, while increasing strand twist decreases contact width and increases contact pressure for the same tensile load, resulting in similar contact forces. Additionally, increasing the number of filaments leads to higher contact forces for the same tensile load per unit linear density of the fiber. Overall, our research provides insight on the effect of rope size and construction on internal pressure and subsequent internal degradation phenomena in ropes at different scales
Effect of load and twist on filament packing in three-strand aramid fibre ropes: a micro-CT study
No full textThis study investigates how varying rope and strand twists influence the filament packing fraction in three-strand Aramid fibre ropes. Micro-computed tomography (micro-CT) scanning was used to visualize and quantify filament arrangements under different twist configurations and loads. High-resolution CT-scan image segmentation enabled the calculation of local filament packing fractions. Results indicate that twist parameters strongly affect how tightlyfilaments pack inside strands, particularly when a tensile load is applied. Higher twist levels often lead to a more compact internal structure, whereas lower twist levels introduce voids and an uneven arrangement. Under tensile loading, additional compaction is observed, especially at strand-to-strand interfaces. The findings help in understanding how twist geometry and applied tensile load redistribute filaments in a three-strand configuration, providing insights intoload sharing, potential filament slip, and internal damage – all critical factors in assessing rope performance and service life
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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