1,720,978 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
Stability of natural dyes under Light Emitting Diode lamps
Full text linkThe exhibition in museums of archaeological and historical textiles must keep into consideration the possible photo-degradation of the dyes. In the last decade, Light Emitting Diodes (LEDs) have been extensively replacing other light sources; nevertheless a few studies on the influence of LEDs on degradation of natural dyes are available.
In this work, the colour fading of silk samples dyed with several natural dyes (containing flavonoids and anthraquinones) and exposed to three different white LEDs is considered. The fading at the end of the exposure experiment was evaluated by measuring the variations induced by the LEDs on the colour coordinates of the samples and by investigating the variation of the concentration of the dyes by high performance liquid chromatography coupled with photo-diode array and mass spectrometric detectors.
The information obtained gives an in depth picture of the fading by considering the actual damage potential of LEDs on natural dyes, which is relevant for selecting the most suitable lamps for display cases
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
Hydraulic behaviour of calcium sulfoaluminate cement alone and in mixture with Portland cement
No full textThe basic component of calcium sulfoaluminate (CSA) cement is C4A3
in the presence of calcium sulfate alone quickly generates, besides aluminium hydroxide, non-expansive ettringite
particles developing in the shape of large prismatic crystals responsible for an elevated mechanical strength. The most
relevant features of the hydration process are: 1) a high reaction rate and phase stability; 2) a considerable free water
consumption and a reduced capillary porosity; 3) a peculiar pore size distribution shifted towards low-porosity regions.
The phase (b) of the investigation mainly aimed at floor concrete applications, where both high compressive strength
and low drying-shrinkage are needed at early curing times. Blending Portland cement with CSA cement enables to
exploit not only the intrinsic contribution of the latter in terms of early strength and reduced shrinkage, but also the
shrinkage-compensating effect exerted by microcrystalline ettringite particles, responsible for an expansive behaviour
and formed by the C4A3$ reaction with water, calcium sulfate and calcium hydroxide generated by Portland cement
hydration. The hydration process of a suitable CSA-Portland cement blend is mainly characterized by: 1) the quick
formation of ettringite and its dominant role among the hydration products; 2) the reduced hydration rate of C3S and
C3A at early ages; 3) the absence of calcium hydroxide; 4) the more concentrated porosity distribution (within the
submicronic region) compared to that of Portland cement
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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