1,720,966 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
POLYESTER BLENDS NANOCOMPOSITES AND COMPOSITES WITH INCREASED THERMAL STABILITY OR FLAME ESTINGUISHING PROPERTIES
No full textThe dispersion of phyllosilicates into polymer or blends at nanometer scale [1] allows improving the properties of the polymer matrix [2] including thermal stability and flame retardancy .Indeed the dispersion of nanoclays favors char formation on the burning surface [3].
Poly(ethylene terephthalate) (PET), which is one of the most diffused polymers, is used in a wide variety of applications. PET-based nanocomposites which contain phyllosilicates are considered superior for providing improved gas barrier properties, due mainly to the strong effect of confinement as the result of a high surface: volume ratio (i.e., reducing chain mobility and permeability [4]), as well as to the enhancement of tortuosity [5] of the path required for small molecules to permeate through the polymer film due to the presence of silicate lamellae. Flame retardancy and gas barrier functions are much-required properties in the area of textiles and civil engineering, the main aim being to develop fabrics or security panels and interior decorations with flame self-extinguishing properties [6].
PET based micro-composites can also show flame estinguishing properties when filled with phosphorous derivatives which are quite effective for imparting flame estinguishig properties to PET blends [7].
In the present contribution some insights on the preparation of PET nanocomposites with modified nanosilicates (dellite) and ipophosphite based microcomposites are reported
Lipid characterization of chestnut and willow honeybee-collected pollen: Impact of freeze-drying and microwave-assisted drying
No full textHoneybee-collected pollen is gaining attention as functional food, `due to its high content of bioactive
compounds, such as essential amino acids, antioxidants, vitamins and lipids. Traditional conservation
methods include drying in a hot air chamber or freezing. These techniques influence the pollen
organoleptic properties and its content of nutraceutical compounds. We analysed the lipid component of
two honeybee-collected pollens, Castanea sativa and Salix alba. Chestnut pollen was characterized by a
higher level of omega-6 fatty acids, while willow pollen showed a higher concentration of omega-3 fatty
acids and carotenoids. Furthermore, two novel conservation methods, freeze-drying and microwave-
assisted drying, were proposed and their impact on the pollen lipid profile was assessed. Only the
microwave treatment showed a damaging action on antioxidant compounds (i.e. reduction of
tocopherols). Overall, this research shed light on the lipid profile of honeybee-collected pollen,
highlighting the nutraceutical importance of pollen as a source of omega-6 and omega-3 polyunsaturated
fatty acids
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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