1,720,974 research outputs found
Editorial Board Members’ Collection Series: Improving Structural Integrity of Metals: From Bulk to Surface
No full textEditorial Board Members’ Collection Series: Improving Structural Integrity of Metals: From Bulk to Surface
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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
Investigation of chemical, physical and mechanical properties of hybrid chitosan-silica based coatings for aluminium substrate
No full textThis paper describes the development and characterization of eco-friendly hybrid coatings using chitosan and tetraethoxysilane (TEOS) through sol-gel processing onto aluminium substrates. Firstly, we investigated the impact of curing temperatures and the addition of a coupling agent (VTMS) on various physical and chemical properties to determine the optimal composition, to achieve crack-free and uniform films. Chemical and physical properties were assessed via FTIR spectroscopy and SEM imaging, while surface wettability was analyzed through water contact angle measurements, and hydrolitic degradation tests were also performed. Since the mechanical strength of bonding is important for protective coatings, the mechanical characterization of optimized films was conducted by pin-on-disk and scratch tests to understand their elasticplastic and adhesive behaviour. Finally, the antibacterial properties were also studied and discussed. The results indicate that an annealing temperature of 100 degrees C and the incorporation of vinyltrimethoxysilane (VTMS) as a coupling agent are essential for producing homogeneous, stable coatings with excellent hydrolytic degradation resistance. The addition of VTMS effectively addresses common challenges associated with hybrid sol-gel coatings, including cracking, porosity, and poor substrate adhesion. Subsequent investigations revealed that both the presence and concentration of chitosan within the hybrid sol-gel coatings significantly enhance mechanical resistance, water resistance, and friction reduction. A strong correlation between increased coating hydrophobicity and decreased coefficient of friction confirms the intrinsic lubricity of chitosan-silica sol-gel coatings. These coatings also exhibit antibacterial properties compared to both the uncoated aluminium substrate and pure silane coatings. Overall, these findings underscore the multifunctional benefits of chitosan-containing hybrid coatings, positioning them as a promising sustainable, transparent, self-lubricating, and water-resistant coating solution for anodized aluminium substrates
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
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