1,721,026 research outputs found
Interpretation of Photocurrent Transients at Semiconductor Electrodes: Effects of Band-Edge Unpinning (submitted to J. Electroanalytical Chemistry)
No full textAppendix C.
The model considers the effects of band edge unpinning on the transient photocurrent response as the result of the build up of minority carriers at the semiconductor/electrolyte interface. The approach is explained in the paper and also in the notes uploaded here. Three Matlab programs are available here to calculate transient behaviour as a function of input variables. See notes from Alison Walker on how to run the Matlab code.
The submitted manuscript is also available here with examples of calculated responses
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
A cross-over randomised controlled trial of selective pressure impressions for lower complete dentures and laboratory investigations into impression pressure variation
Full text linkPart I of this Thesis gives a brief outline of the history and evidence for impression techniques for complete dentures. The literature review suggested there was a paucity of high quality evidence for impression techniques for complete dentures, especially in the form of randomised controlled trials (Jokstad et al 2002, Harwood 2008).
The literature review from Part I suggested that selective pressure impressions for complete dentures required evidence on three levels; firstly, in-vitro evidence on the numerous factors that affect pressure, secondly evidence that within a specific impression technique the pressure is re-distributed, and thirdly evidence that the specific impression technique provides patient benefit. Part II, III and IV of this Thesis address each of these issues in turn. Part II of the Thesis uses laboratory based in-vitro impression pressure research to investigate new issues and re-address old controversies where the evidence in the literature was conflicting or deficient. Part III investigates the specific distribution of pressure within the impression technique used for the clinical trial of Part IV, concluding that the pressure was distributed in a specific and useful way, which was clinically significant.
The Clinical Trial reported in Part IV of this Thesis, had the primary objective of assessing patient preference for a specific selective pressure impression for complete dentures. The cross-over, randomised, controlled, clinical trial (RCT) was performed comparing a selective pressure impression with a placebo and an alternative method of redistributing pressure. Patients who had shown a specific pressure related clinical problem were recruited for the study. The results show that the preference for the selective pressure impression was greater than that of the other two techniques.
The work of this Thesis introduces dentists to a successful impression technique and provides them with clear, clinically relevant and useful evidence for that impression technique
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
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