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
Potencial de espécies de bambu para a produção de briquetes
Full text linkBamboo is a versatile plant that is widely used in many areas for feeding, manufacturing of utensils, construction and environmental purposes. The energetic use of bamboo stalks or residues from other applications is a promising alternative and compatible with sustainable development principles. This study aimed to evaluate the potential of four bamboo species (Bambusa vulgaris, Phyllostachys bambusoides, Phyllostachys edulis and Phyllostachys nigra) for briquette production. The following properties were evaluated: moisture content, bulk density, compression strength, proximate analysis, gross calorific value and energetic density. The results showed numbers ranging from 1.109 g cm-3 to 1.228 g cm-3 for bulk density, 4.68 MPa to 5.82 MPa for compression strength, 79.01 % to 82.25 % for volatile content, 15.26 % to 20.18 % for fixed carbon content, 0.38 % to 2.49 % for ash content, 4,571 kcal kg-1 to 4,716 kcal kg-1 for gross calorific value and 5.08 Gcal m-3 to 5.84 Gcal m-3 for energetic density. The briquettes produced from P. nigra presented the best energetic quality, followed by briquettes from P. edulis, P. bambusoides and B. vulgaris. Overall, it may be said that the four bamboo species can be used as alternative raw materials for energy generation.
KEYWORDS: Bambusa vulgaris, Phyllostachys bambusoides, Phyllostachys edulis, Phyllostachys nigra, renewable fuels.O bambu é uma planta versátil e amplamente utilizada na alimentação, fabricação de utensílios, construção civil e usos ambientais. O uso energético dos colmos ou resíduos de outras aplicações é uma alternativa cada vez mais promissora e compatível com os princípios do desenvolvimento sustentável. Objetivou-se avaliar o potencial de quatro espécies de bambu (Bambusa vulgaris, Phyllostachys bambusoides, Phyllostachys edulis e Phyllostachys nigra) para a produção de briquetes. Avaliaram-se o teor de umidade, densidade aparente, resistência à compressão, composição química imediata, poder calorífico superior e densidade energética. Os briquetes tiveram densidade aparente variando de 1,109 g cm-3 a 1,228 g cm-3; resistência à compressão de 4,68 MPa a 5,82 MPa; teor de voláteis de 79,01 % a 82,25 %; teor de carbono fixo de 15,26 % a 20,18 %; teor de cinzas de 0,38 % a 2,49 %; poder calorífico superior de 4.571 kcal kg-1 a 4.716 kcal kg-1; e densidade energética de 5,08 Gcal m-3 a 5,84 Gcal m-3. Os briquetes produzidos a partir de P. nigra apresentaram melhor qualidade energética, seguidos dos briquetes de P. edulis, P. bambusoides e B. vulgaris. Diante dos resultados, pode-se aferir que as quatro espécies de bambu são matérias-primas alternativas para a geração de energia.
PALAVRAS-CHAVES: Bambusa vulgaris, Phyllostachys bambusoides, Phyllostachys edulis, Phyllostachys nigra, combustíveis renováveis
ENERGETIC POTENTIAL OF Phyllostachys bambusoides AS AN ALTERNATIVE SOURCE OF BIOMASS
Full text linkIn Brazil, Phyllostachys bambusoides has been used for the manufacture of laminated bamboo products and landscaping. However, studies of its energy quality are rare. Thus, this study aimed to determine the energetic quality of Phyllostachys bambusoides for the use of stems in the fresh form (chips) for direct burning, as charcoal and as briquettes. Its energy potential was also determined by mass and energy balance for each solid biofuel (chips, briquettes, and charcoal). The analyzes were carried out on five individuals (shoots) at 3 years of age, collected at experimental plantations in Frei Rogério, SC. In the stems the newly collected moisture was determined; specific gravity; chemical composition; immediate analysis and higher calorific value. In laboratory charcoal, gravimetric yield, apparent relative density, immediate analysis, and higher calorific value were determined. The briquettes, made in the laboratory, were evaluated through their apparent density and compressive strength. For the stems, charcoal, and briquettes the energy density was calculated and a flowchart composed of the mass balance was calculated and the thermal energy production potential for each 100 kg of biomass used in the production of each biofuel analyzed was calculated. The energy density of stems (1.87 Gcal.m-3), charcoal (2.60 Gcal.m-3), and briquettes (4.68 Gcal.m-3) varied significantly. The highest useful energy potential can be obtained from briquettes (0.304 Gcal), charcoal (0.184 Gcal) followed by stems (0.168 Gcal) for each 100 kg of bamboo harvested with a mean moisture content of 35%
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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