1,720,983 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
Mxene modified layered double hydroxide nanocomposite for photocatalytic carbon dioxide reduction to renewable fuels
Get PDFPhotocatalytic conversion of carbon dioxide (CO2) to solar fuels is a promising solution to resolve the energy crisis and global warming issues. The overall efficiency of photoreduction of CO2 to fuels can be improved through the development of highly efficient catalyst and suitable photoreactor configuration. Hence, the main objective of this research work was to design a photocatalytic reactor system and synthesize cobalt-aluminium-lanthanum-layered double hydroxide (CoAlLa-LDH) modified with graphitic carbon nitride (g-C3N4) and titanium carbon (Ti3C2TA/R) MXene for enhanced photocatalytic reduction of CO2 to renewable fuels. Initially, a novel CoAlLa-LDH was synthesized by co-precipitation method that has hexagonal nanosheet structure. The Ti3C2TA/R was synthesized through controlled etching with hydrogen fluoride acid that resulted in the formation of layered structured Ti3C2 MXene embedded with anatase and rutile phases of titanium dioxide (TiO2). The Ti3C2TA/R having layered structure and embedded TiO2 effectively acted as electrons reservoir and electrons mediator, respectively. Graphitic carbon nitride (g-C3N4) nanosheets were obtained through thermal heating and subsequent sonication. g-C3N4, CoAlLa-LDH and Ti3C2TA/R were hybridized to obtain g-C3N4/CoAlLa-LDH, g-C3N4/Ti3C2TA/R, Ti3C2TA/R/CoAlLa-LDH and g-C3N4/Ti3C2TA/R/CoAlLa-LDH composites with layer-by-layer assemblies. The performance of photocatalysts was investigated through photocatalytic reduction of CO2 with water (H2O), dryreforming (DRM) and bireforming (BRM). Among LDHs the Co2Al0.95La0.05-LDH showed maximum photocatalytic reduction of CO2 with H2O resulting in production rate of 21.80 and 25.5 µmolegcat-1h-1 for CO and CH4, respectively. The g-C3N4/Ti3C2TA/R/Co2Al0.95La0.05-LDH sample resulted in maximum CO and CH4 production rate of 106 and 49.8 µmole gcat-1h-1 through photocatalytic reduction of CO2 with H2O. The g-C3N4/Ti3C2TA/R sample showed very good performance in photocatalytic DRM with production of 73.31 and 51.24 µmole gcat-1h-1 for CO and H2, respectively. The g-C3N4/Ti3C2TA/R/Co2Al0.95La0.05-LDH sample, through photocatalytic BRM showed maximum CO and H2 production of 47.81 and 73.31 µmole gcat-1h-1 with higher selectivity towards H2 production that is a high-quality syngas. The best performing g-C3N4/Ti3C2TA/R/Co2Al0.95La0.05-LDH catalyst in the fixed bed photoreactor for photocatalytic BRM was compared with multistage mesh photoreactor (MSM). The MSM showed syngas production of 1.81 and 1.22 folds higher as compared to fixed bed photoreactor for CO and H2 respectively. The effects of various parameters such as amount of catalyst, feed ratio and illumination time for the photocatalytic reduction of CO2 was studied to optimize yield and selectivity of fuel products through response surface methodology. It was found that the optimum CO production was obtained at 0.143 g, 4.48 h and 1.67 while the optimum H2 production obtained was at 0.143 g, 4.93 h, 1.41 of catalyst loading, time and feed ratio, respectively. Finally, Langmuir-Hinshelwood model was developed to investigate adsorption behaviours and photocatalytic oxidation and reduction process, fitted well with the experimental data. It was determined that CO and H2 production were dependent on quantity of CO2 and CH4 in the feed, respectively. In conclusion the Ti3C2TA/R and g-C3N4 modified CoAlLa-LDH catalyst can produce high quality renewable syngas fuel with high selectivity towards H2 production
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
Well-designed 2D/2D Ti3C2TA/R MXene coupled g-C3N4 heterojunction with in-situ growth of anatase/rutile TiO2 nucleates to boost photocatalytic dry-reforming of methane (DRM) for syngas production under visible light
No full textWell-designed fabrication of 2D/2D g-C3N4/Ti3C2TA/R (CN/TCT) MXene heterojunction with in-situ growth of TiO2-nucleates for boosting photocatalytic dry reforming of methane (DRM) has been investigated. Samples were synthesized through controlled chemical etching process to construct a TiO2 (anatase/rutile) embedded Ti3C2 (TCT) with layer by layer construction of g-C3N4, resulting in higher visible light absorption and proficient charges separation. Etching Ti3AlC2 with HF (49 vol. %) produces more TiO2 compared with HF (39 vol. %), whereas, amount of TiO2 produced was dependent on reaction time. The CN/TCT composite exhibited H2 and CO rate of 51.24 and 73.31 µmole g-1 h-1, much higher than using CN and TCT. This reveals layered Ti3C2 sheets embedded anatase/rutile TiO2, enabling proficient charge carrier separation with light absorption. The effect of feed ratio (CO2/CH4) further confirmed efficient sorption process with good recyclability and would be beneficial to promote the conversion of CO2 and CH4 to syngas under visible light
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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