1,720,987 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
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
Triplet Excitation Energy Transfer in Donor-Bridge-Acceptor Systems: Experimental and Theoretical Investigations
No full textThis thesis is a contribution to the understanding of bridge mediation of electron exchange processes in Donor-Bridge-Acceptor (D-B-A) systems. The field of research is relevant for the development and optimization of dye-sensitized solar cells, artificial photosynthesis, and the possible future development of molecular electronic devices. First an investigation of porphyrins, a group of molecules commonly used as donors and acceptors in D-B-A systems, is presented. Then an experimental and theoretical investigation of the influence of several system parameters on triplet excitation energy transfer (TEET) ensues. Finally, the work aims for future applications with the characterization of self-assembled monolayers (SAMs) of OPE-structures, commonly used as bridges in D-B-A systems, on gold.
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The main focus of this thesis is to investigate what governs the bridge mediation of TEET in D-B-A systems. The investigation starts with an experimental study of TEET in a series of D-B-A systems, where a zinc(II) porphyrin acts as the donor and the corresponding free-base porphyrin acts as the acceptor. The donor and acceptor chromophores are separated by oligo-p-phenyleneethynylene bridge units where the number of phenyleneethynylene groups varies between 2 and 5. The experiments are supported by a large number of theoretical calculations, leading to a model for the conformational dependence of the electronic coupling that reproduces the experimentally determined temperature dependence of the bridge mediation.
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In a parallel, purely theoretical, investigation, the bridge mediation of the electronic coupling for TEET is found to depend on the energy gap between relevant states, EDB, and the donor-acceptor separation, RDA, in accordance with the McConnell model. The applicability of this model to systems with conjugated bridges is discussed and examples of systems where the model does not apply are identified. For these systems an alternative model, based on electron tunneling through a square barrier, first derived by Gamow, is found to qualitatively describe the data. A more elaborate version of this model is found to accurately describe both the dependence of donor-acceptor separation and donor-bridge energy gap on the electronic coupling for experimental data from literature. The advantage of this model is that it will potentially allow for the use of molecular properties of the individual building blocks, available from experiments and/or calculations, to predict the properties of D-B-A systems
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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