1,721,449 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
Metallopolymers as Nanostructured Solid-State Platforms for Electrochemiluminescence Applications
No full textElectrochemiluminescence (ECL) is the process of light emission arising from an electrochemically generated excited state. ECL has been demonstrated to be a powerful tool for bioanalysis, in particular when phosphorescent transition metal complexes (TMCs) are used as emitters. Apart from molecular luminophores, there has been increasing interest in the use of both non-conjugated and π-conjugated metallopolymers over the last decade. Research efforts in this direction are driven by the appealing possibility to synergistically combine typical features of polymers, such as processability, with the enhanced photophysical and redox properties of several classes of TMCs. Indeed, solid-state arrangements of ECL-active metallopolymers enable their straightforward use as sensors with enhanced response. This concept article focuses on ECL-active metallopolymers and their use in solid-state platforms, providing a survey with relevant examples together with properties, mechanisms and proposed applications. Finally, the outlook for future applications across different research fields for these materials as well as their limitations for will be discussed
Geometric structure and optical properties of the GaAs(001)-c(4 X 4) surface
No full textWe consider the electronic structure and optical properties for several geometries of the GaAs(001)-c(4x4) surface using first-principles calculations. We find strong evidence that the best agreement with photoemission and reflectance anisotropy spectroscopy experiments carried out on surfaces prepared under As-4 flux is obtained for a structure containing three Ga-As dimers per unit cell. The standard As-As dimer model yields similar, but distinguishable results, while an asymmetric dimer model is found to yield completely incompatible surface spectra
The transition from 3C SiC(111) to graphene captured by ultra high vacuum scanning tunneling microscopy
No full textIn this paper we clarify the transformation mechanism of 3C-SiC into graphene upon thermal decomposition, by a combination of high resolution Scanning Tunneling Microscopy (STM) images and first principle calculations. We studied the transition from 3C-SiC to graphene by high temperature annealing of C-terminated 3C SiC (1 1 1)/Si (1 1 1) samples in Ultra High Vacuum. By using STM we were able to observe very clear atomic resolution images of the transition from SiC (v33)R30࠴o a new intermediate stage SiC View the MathML source (very close to the graphene (2 נ2) reconstruction) after annealing at 1250 î We also obtained images of the transformation of the intermediate structure into a (1 נ1) monolayer graphene, caused by further sublimation of atoms in the subsurface layer. We have interpreted the results by using Density Functional Theory - Local Density Approximation calculations, which give full account of the SiC (v33)R30࠲econstruction, but fail to describe the SiC View the MathML source structure due to its incommensurability with the 3C-SiC (1 1 1) lattice.Full Tex
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
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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