1,720,959 research outputs found
Development and Characterization of Advanced Recycled Hybrid Metal Matrix Composites via Enhanced Stir Squeeze Casting Method for Industrial Applications
Full text linkThis study presents the development and characterization of advanced recycled hybrid metal matrix composites (HMMCs) using an optimized stir squeeze casting technique. The hybrid composites were fabricated using recycled aluminum alloy (AA6061), ceramic particles, and carbon fibers. The optimization of critical process parameters such as stirring speed, casting temperature, and squeeze pressure resulted in composites with superior mechanical and physical properties. Comprehensive testing revealed that the HMMCs exhibited a 20% increase in tensile strength, a 30% improvement in hardness, and a 15% enhancement in impact resistance compared to conventional metal matrix composites (MMCs). Additionally, the composites demonstrated a 10% improvement in thermal conductivity, making them suitable for applications requiring efficient heat dissipation. The successful incorporation of recycled materials not only promoted sustainability but also reduced production costs. The findings underscore the potential of these hybrid composites for high-performance applications in automotive, aerospace, and thermal management industries. Future research should explore the use of other recycled materials and further optimization of casting parameters to enhance composite performance
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
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
Development of an abrasive material using periwinkle shells
No full textAbstractIn this study, abrasive properties of periwinkle shell grains with the binding effect of polyester resin on periwinkle shell grains at high concentration were investigated. The abrasive properties considered are hardness, compressive strength and wear resistance. Periwinkle shells were processed into FEPA grit standards by ball milling and then sieved using ASTM E11 set of sieves into grain sizes of P40, P60 and P140 grits. Further on, the grits were developed into polymer matrix composite with particles varying from 95wt.% to 87wt.% and resin 4wt.% to 12wt.% with 0.5wt.% each of cobalt naphthalene and methyl ethyl ketone peroxide hardener by mixing and mold compression in a hydraulic press. It was found that hardness and compressive strength increased, wear rate decreased with an increase in polyester resin content. The composition with most improved abrasive properties was 87wt.% periwinkle shell grains to 12wt.% polyester resin. Scanning Electron Microscope (SEM) surface morphology of the composite microstructure revealed this composition to possess good interfacial bonding between particles of PWS and polyester resin, PWS grains to retain a defined shape and grain orientation with less distortion from compressive stresses and less grain pull-out effect from wear
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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