1,720,961 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
Utilização de bactérias isoladas do solo para produção de xilanase e de bioetanol
Get PDFMicroorganisms can secrete enzyme-rich substances that are capable of breaking down a series of organic molecules. Therefore, microorganisms have wide applicability in a number of biotechnological processes. Among the microbial enzymes, xylanases have high biotechnological potential and are of interest for the food, pharmaceutical and papermaking industries. Aside from the production of industrially useful enzymes, another trend of a biotechnological use of microorganisms is bioethanol production. This study addressed the isolation of soil bacteria for xylanase and bioethanol production. For xylanase production by Bacillus sp TC-DT13, agro-industrial residues were selected by submerged fermentation. The selected residue was used to produce xylanolytic enzymes by solid state fermentation. Of the tested residues, wheat bran was found to be the best inducer of xylanase production (1500 U/mL). On the other hand, wheat bran as the sole fermentation substrate in solid state fermentation for 144 hours, at a bran : moisture ratio of 1:4, induced an excessive amount of xylanase (2943 U/g). The use of carbon and nitrogen sources did not raise the xylanolytic enzyme production. The use of agro-industrial wastes in solid state fermentation, apart from increasing xylanase production and reducing costs, is also an environmentally friendly alternative. For ethanol production, Bacillus spp. and Paenibacillus sp were tested with regard to their ability to ferment xylose. The strains were subjected to xylose fermentation at different enzymatic concentrations. Among the strains tested for development evaluation in xylose medium, the five (TC-DT8, TC-DT64, TC-DT81 and TC-DT139 and TC-DT13) with highest cell growth in 2% xylose were selected. Under stirred fermentation, the ethanol production of the strains varied from 1.59 - 2.6 g L-1 . Therefore, it can be concluded that some of the bacterial strains tested were able to grow in xylose-containing medium. Moreover, Bacillus sp. TC-DT13 and Paenibacillus sp. TC-DT8 produced ethanol with and without stirring.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESOs microrganismos são capazes de secretar enzimas e realizar a quebra de diversas moléculas orgânicas. Por isso, os microrganismos possuem vasta aplicabilidade em diversos processos biotecnológicos. Dentre as enzimas produzidas por micro-organismos, as xilanases possuem alto potencial biotecnológico, sendo de interesse para indústrias alimentícia, farmacêutica e de produção de papel. Além da produção de enzimas de interesse industrial, outro viés biotecnológico com o uso de microrganismo é a produção de bioetanol. O objetivo do presente estudo foi utilizar bactérias isoladas do solo para produção de xilanase e de bioetanol. Para a produção de xilanase através do Bacillus sp TC-DT13 foi realizada uma seleção com resíduos agroindustriais através da fermentação submersa. O resíduo selecionado na etapa anterior foi utilizado para produzir enzimas xilanolíticas sob fermentação em estado sólido. Dentre os resíduos utilizados, o farelo de trigo foi selecionado como o melhor indutor de produção de xilanase com 1500 U/mL. Enquanto que na fermentação em estado sólido, o uso de farelo de trigo como o único substrato de fermentação na proporção de 1:4 de umidade ao longo de um período de 144 horas induziu uma quantidade excessiva de xilanase atingindo 2943 U/g. O uso de fontes de carbono e nitrogênio não influenciou o aumento da produção de enzimas xilanolíticas. O uso dos resíduos agroindustriais na fermentação sólida, além de aumentar a produção de xilanase e reduzir os custos, também é uma alternativa favorável ao meio ambiente. Para produção de etanol, linhagens de Bacillus spp. e Paenibacillus sp foram testadas quanto a sua capacidade de fermentar xilose. As linhagens foram submetidas à fermentação com xilose em diferentes concentrações. Dentre as linhagens testadas para avaliação de desenvolvimento em meio com xilose, 5 linhagens TC-DT8, TC-DT64, TCDT81 e TC-DT139 e TC-DT13 foram selecionadas por obterem maior crescimento celular em 2% de xilose. Na fermentação sem agitação, o Bacillus sp. TC-DT13 e Paenibacillus sp. TCDT8 foram as linhagens que mais promoveram a produção de etanol em 36 horas com 7,06 e 4,33 g L-1 , respectivamente. Enquanto que na fermentação com agitação a produção de etanol entre as linhagens variaram de 1,59 g L-1 até 2,6 g L-1 . Portanto, pode-se concluir que algumas das linhagens bacterianas testadas foram capazes de se desenvolverem em meio contendo xilose. Além disso, o Bacillus sp. TC-DT13 e Paenibacillus sp. TC-DT8 produziram etanol tanto com agitação quanto sem agitação.Universidade Federal de Sergip
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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