1,720,956 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 of MgO nanoparticles via the sol-gel method for antibacterial applications, investigation of optical properties and comparison with commercial MgO
No full textMagnesium oxide nanoparticles (MgO-NPs) were synthesized using the solution-gelation (sol-gel) technique. For comparison, US Research Nanomaterials, Inc has supplied MgO with very high purity and used without further purification. Both nanoparticles were subjected to X-ray diffraction (XRD) pattern analysis for structural investigation. The XRD measurements showed an incredibly crystalline cubic structure. Morphological studies were carried out using scanning electron microscopy (SEM) measurements to examine the nanoparticles’ size and shape. SEM analysis of the synthesized sample’s morphology revealed a flake-like shape, while a spherical-like structure was observed in the case of the commercial MgO. Using X-ray peak broadening analysis, the Scherrer method was used to assess the crystallite size. A substantial correlation was found between the Scherrer formula and the average particle size of the MgO-NPs, which was determined through SEM analysis. The energy gap calculations were ascertained by plotting the photon energy utilizing the Tauc equation with the measurements of UV–visible absorption spectroscopy. Both nanoparticles were used against the bacterial activity of Streptococcus and Serratia bacteria. The results showed that synthesized nanoparticles exhibited greater effectiveness against bacterial activity than commercial ones
Synthesis of MgO Nanoparticles via the Sol–Gel Method: A DFT+U Analysis and Antibacterial Efficacy Comparison with Commercial Counterparts
No full textA sol–gel technique was utilized to synthesize magnesium oxide nanoparticles (MgO NPs) and compared to commercially available MgO NPs obtained from US Research Nanomaterials, Inc. X-ray diffraction (XRD) analysis revealed a highly crystalline cubic structure for both samples. Scanning electron microscopy (SEM) examinations showed that the synthesized MgO was nanoflakes (NFs), while the commercial MgO exhibited a spherical structure. The size of the crystallites was determined using the Scherrer method, showing a strong correlation with the SEM examination. In conjunction with the Tauc equation, UV–visible absorption spectroscopy was used to calculate the energy gap. The dielectric constants are determined for the entire spectrum and show very low values in the visible spectrum. Comparative antibacterial studies against Staphylococcus aureus (S. aureus) and Pseudomonas aeruginosa (P. aeruginosa) bacteria demonstrated that the synthesized NFs exhibited greater efficacy. Density functional theory (DFT) calculations using the Generalized Gradient Approximation with a Hubbard correction (GGA + U) revealed that the electronic characteristics of the MgO structure were primarily influenced by the oxygen 2p orbitals, with the band gap significantly impacted by the U parameter for oxygen. The determined band gaps for the synthesized and commercially available MgO nanostructure strongly agree with the experimental values. Density of states (DOS) analysis confirmed the difference in energy gap between the two nanostructures. The increased band gap of the synthesized NFs was associated with their reduced dimensions and unique structure, enhancing their antibacterial efficacy by facilitating superior attachment to bacterial cell surfaces
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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