1,720,970 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Interfacial Characteristics of Insert-Injection Molding by Using Acoustic Emission
No full textAim of this study focused on insert injection molding process, which is molded the melted polymer around an inserted part placed in the molded cavity of injection molding process. The interfacial adhesive strength between the inserted and an injected polymer parts were investigated by Intron universal test machine in order to investigate the effect of material in inserted and injected part. During tensile testing the acoustic emissions (AE) measurement was applied to evaluate the fracture behavior of insert injection molding. It was found that interfacial adhesive strength of insert injection molded of all specimens increased according with increasing the bonding area of adhesive interface. The fracture mode of the insert injection molded specimens was depended on the length of bonding area of the inserted part. The fracture of mode of the insert-injection molded specimens was confirmed by acoustic emission.</jats:p
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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
Investigation on Fracture Behavior of Glass Fiber Reinforced Thermoplstic and Thermosetting Composites
No full textGlass fiber reinforced thermoplastics and thermosetting composites were prepared in this study. Commercial grades of 20% glass fiber filled polypropylene, polyoxymethylene, polyamide 6 and polycarbonate were injection molded to dumbbell specimens. The specimens are referred as GF/PP, GF/POM, GF/PA and GF/PC, respectively. 55% GF reinforced novolak composites were fabricated by hand lay-up, which different curing times of 20 s, 35 s and 50 s. Mechanical properties, fracture behavior and morpgology of GF composites with and without notched were investigated. GF/PA showed the highest properties of tensile properties, notched strength and fracture toughness as compared to all of GF reinforced thermoplastics in this research. On the other hand, tensile properties and fracture toughness of GF reinforced novolak increased with increasing curing times. SEM photographs indicated ductile fractured surface near the crack edge while their brittle appeared at far of the crack in GF reinforced thermoplastics. It can be noted that notched sensitivity of GF reinforced thermoplastics was lower than GF reinforced thermosetting composites.</jats:p
Interfacial Properties of Injection Molded Glass Fiber/Thermoplastics Composites
No full textFour kinds of commercial glass fiber reinforced thermoplastics including GF reinforced polypropylene (GF/PP), GF reinforced polyamide 6 (GF/PA6), GF reinforced polycarbonate (GF/PC) and GF reinforced polyoxymethylene (GF/POM) were used in this study. The contents of GF were 10%, 20% and 40%. GF/PP, GF/PA6, PF/PC and GF/POM composites were fabricated to dumbbell specimen by injection molding. The effect of glass fiber contents on tensile properties, morphology and dynamic mechanical properties was investigated. Fiber volume fraction, fiber length distribution and fiber orientation were observed by burning off polymer resin and dispersed remaining fibers on a glass slide. The Kelly-Tyson model is used for prediction strength and calculated the critical fiber length of each GF reinforced polymer composites. Tensile strength of all composites increased with increasing glass fiber contents. The fiber orientation factor and the fiber length distribution were increased at higher contents of glass fibers. The interfacial shear strength values of GF/PP, GF/PC and GF/POM composites increased with increasing fiber contents while the declination of the interfacial shear strength was found in GF/PA6 composites. It is interesting to report that the interfacial shear strength of GFRP composites was calulated according to the modified rule of mixture (MROM) and the Kelly-Tyson model, which the interfacial shear strength of the composites increased with incresing glass fiber contents.</jats:p
Interfacial Properties of Carbon Fiber Reinforced Thermoplastic and Thermosetting Composites
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