1,721,191 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
Synthesis and atomic resolution AC-TEM characterisation of graphene edges
Full text linkMy primary goal was to perform an in depth characterisation of the atomic structure of graphene edges, which was fulfilled through the use of an aberration corrected transmission electron microscope (AC-TEM) – OJ2200 MCO that was enhanced with a double Wien slit monochromator to improve its spatial resolution to ∼ 80pm. The chemical vapour deposition grown graphene was characterised by various techniques, including the use of Scanning Electron Microscopy (SEM) and Raman spectroscopy to respectively determine the homogeneity and number of layers, and selected area electron diffraction (SAED) to distinguish the size of single crystal region. With this set up, I obtained images of graphene edges at atomic resolution that allowed bond length determination. Based on the acquired information and the application of the density functional theory, it was possible to correlate structural information with the bonding nature of graphene edges; allowing me to further determine the hydrogenation states of graphene with a single AC-TEM frame. Imaging with electron beam monochromation also allowed me to discover the theoretically predicted extended Klein edge structure, which is included as the fourth inherent periodic structure of graphene edges. With the aid of an in situ heating holder, the temperature dependence of graphene edges were investigated over 350 frames: zig-zag edges are found to dominate at ≤ 400°C; and at temperatures above 600°C, the proportion of armchair and reconstructed 5-7 edges increase dramatically. This is because low temperatures allow contamination, which result in edges becoming etched at a more rapid rate that favours the formation of intrinsic zig-zag edges. The predominance of armchair and reconstructed zig-zag edges at high temperatures could be attributed to the evaporation of surface adsorbates, which resulted from higher thermodynamic stability. Finally, the in situ growth of a second layer graphene was investigated. Extra layers of graphene was found to heterogeneously nucleate around gold nanoparticles and continuous to grow at 600°C. This study shed light on the growth mechanism of CVD. By bridging the dangling bonds from the edges of two layers of graphene, this structure was extended to form a closed edge graphene nanopore with diameter ranging from 1.4 – 7.4 nm, The closed edge nanopores in bilayer graphene are robust to back-filling even after exposure to atmospheric conditions for days - this opens new possibilities of nanopore fabrication routes for applications such as graphene sensors and DNA sequencing technology
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
- …
