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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
Reductive leaching of manganese and zinc from spent alkaline and zinc-carbon batteries in acidic media
No full textThe main purpose of this work was to investigate the effectiveness of oxalic acid as a reductant for the leaching of manganese and zinc from spent alkaline and zincâcarbon batteries in sulfuric acid or hydrochloric acid media. Three different types of battery powders were tested: zincâcarbon, alkaline and mixed (50% zincâcarbon, 50% alkaline). Kinetic tests were initially conducted with the mixed battery powder. Leaching experiments were carried out according to 24 full factorial design, and regression equations for the leaching of Mn and Zn were determined. Washing of the powders (neutral leaching) was effective on the removal of potassium and chloride. Increasing solid/liquid ratio from 1/5 to 1/10 in neutral leaching did not significantly change potassium and chloride removal. A leach duration of 3 h was found to be generally sufficient for the equilibrium to be reached for both Zn and Mn. Oxalic acid concentration had strongest negative effect on Zn leaching in both sulfuric and hydrochloric acid media, whereas the concentrations of sulfuric and hydrochloric acids exhibited strongest positive effect for both Mn extraction yield (MnEY) and Zn extraction yield (ZnEY). In the range of tested conditions, pulp density had no important effect on MnEY and ZnEY for both acids. Temperature had negative effect for both MnEY and ZnEY in sulfuric acid solution; however, such effect was less pronounced in hydrochloric acid solution. For the sulfuric acid solution, 91% MnEY and 112% ZnEY were achieved at 45 °C after 3 h of leaching by 10% pulp density, â30% oxalic acid (30% less than the stoichiometric requirement), +30% H2SO4. For the hydrochloric acid solution, about 86% MnEY and 95% ZnEY were obtained at 20% pulp density, â30% oxalic acid, +30% HCl, at 45 °C after 3 h of leaching
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
A review of technologies for the recovery of metals from spent alkaline and zincâÂÂcarbon batteries
No full textThe main aim of this paper is to review and evaluate the recovery studies and associated technologies for metals from spent batteries. More attention was given especially to the recovery of Zn and Mn from spent alkaline and zincâcarbon batteries. Nowadays much research work is concentrated on the recovery of Zn and Mn from alkaline and zincâcarbon batteries. Various different metal recovery processes including physical, pyrometallurgical and hydrometallurgical ones are discussed. Compared to pyrometallurgical methods, hydrometallurgical methods are becoming a well-established and efficient method for recovering metals from raw materials. Although there have been many proposed or currently applied recovery processes majority of them are effective only in recovering certain components of spent batteries. Considering the more stringent regulations and cost, environmental protection, preservation of raw materials issues; thus, effective, economical and practical recovery technologies are required not only for metal recoveries but also for other components of batteries such as plastic, paper, steel, etc. More research work should be conducted to develop such recovery technologies. In addition, process control and plant optimization studies should also be conducted for more feasible full-scale applications
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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