1,720,987 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
Enhancement of trans-corneal permeation of riboflavin-5'-phosphate from new ophthalmic solutions. A promising, non-invasive approach for corneal trans-ephithelial cross linking treatment
No full textCorneal accumulation of riboflavin-5’-phosphate (Riboflavin) is an essential step in the so called collagen cross-linking (CXL), the elective therapeutic approach for the treatment of keratoconus, also adopted in the treatment of corneal ectasia and irregular astigmatism. Since corneal epithelium impedes the passage of riboflavin, which, therefore, is unable to penetrate deep into the corneal stroma in a relatively short time, CXLis usually performed aftersurgicaldebridement of corneal epithelium.
D-alpha-tocopheryl poly(ethylene glycol) 1000 succinate (VE-TPGS) is a really effective permeation enhancer used to increase adsorption of drugs trough different biological barriers. Moreover, belonging to the group of tocopherols pro-drugs, VE-TPGS exerts a protective effect on biological membrane against free-radical damage.
The aim of this work is the evaluation of VE-TPGS effects on intact cornea permeability ofriboflavin, and the potential protective effect against free-radicals generated in CXL procedures. Different solutions containing riboflavin (0.125% w/w), dextran(20.0% w/w) and increasing concentration of VE-TPGS were prepared. Corneal permeation was evaluated in vitroby the use of modified Franz-cell type diffusion cells and freshly excised porcine corneas as barrier. The effect of VE-TPGS on Riboflavin corneal penetration was compared with standard commercial solution of riboflavinin dextran at different times. Accumulation experiments were conducted both on normal and disepithelized corneas.Moreover, intact porcine corneas,treated with the new proposed solutions, were subjected toan in vitro CXL procedure and compared with disephitelized corneas, treated withcommercial solution of riboflavin. Differences were measured by meansoffirmnessof treated corneas using Young’s modulus. The photo-protective effect of proposed solutions on corneal epithelium was, finally, evaluated. CXL protocol was applied, in vitro, on human explanted corneas and resulting morphology of corneal epithelium was investigated by scanning electron microscopy
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
Numerical simulation of machining distortions on a forged aerospace component following a one and a multi-step approaches
No full textDispelling 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
Numerical simulation of machining distortions on a forged component obtained by ring rolling process
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