1,721,703 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
UNI-11466 and numerical approach in design of horizontal ground heat exchangers
No full textGround-coupled heat pumps are a reliable technology for space heating and cooling. When coupled with horizontal ground heat exchangers, the profitability may increase according new advanced shapes may that show high performances. In the present study, the analytical method proposed by the Italian regulation UNI-11466 is applied for sizing a novel type of ground heat exchanger, so-called flat-panel, according the equivalent heat transfer surface for unit of trench of the slinky-coil. Two other configurations of straight pipes have been considered disposed horizontally and vertically inside trenches, all of them working in a four lined geothermal field. The space heating requirement of a building has been evaluated assuming a simplified lumped system and three climate zones, defined by different degree days (2000, 2500, 3000 DD). Then, a 2D finite-element model has been implemented for solving in unsteady state the heat conduction in ground of the former sizing, and the results are compared in terms of average temperature at the wall surface of the
exchanger. The two straight pipes configurations achieve the minimum temperature predicted by the regulation, such as for the flat-panel case. Therefore, the slinky-coil equivalent approach can be used for sizing the flat-panel shape by means of UNI-11466
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
Identification of Genes Putatively Involved in the Biosynthesis of Antitubercular Peptide in Streptomyces ribosidificus NRRL B-11466
No full textAims: To determine the potential antitubercular activity of Streptomyces ribosidificus NRRL B-11466 both on genotypic and phenotypic levels.
Methodology: Standard methods and software programs were used for nucleotide/protein sequence analysis and phenotypic detection of antitubercular activity.
Results: Analysis of the submitted DNA segment (accession code = AJ744850) harbouring the ribostamycin biosynthetic gene cluster showed that the respective gene cluster was flanked in the upstream region by three open reading frames (ORFs), encoding putative type II thioesterase (SribL03.14c) and two nonribosomal peptide synthases (SribL03.14c and SribL03.14c). These ORFs were of high amino acid similarities (about 80%) to those located in the viomycin and related antibiotic biosynthetic gene clusters. A DNA segment harbouring three ORFs, putatively involved in capreomycidine biosynthesis was submitted into the GenBank database under the accession code HQ327309. Comparative analysis of the respective DNA segment with viomycin and related antibiotic biosynthetic gene clusters showed: firstly, location of the respective DNA segment in the neighbourhood and upstream to the ribostamycine biosynthetic gene cluster; secondly, conservation of six ORFs: SriC (putative L-arginine hydroxylase); SriD (putative L-capreomycidine synthase), SriE (putative permease) located on our submitted DNA fragment; and SribL03.14c, SribL03.15c, SribL03.16c located on the DNA fragment harboring ribostamycin biosynthetic gene cluster, among the tested biosynthetic gene clusters. Phenotypically, S. ribosodificus inhibited growth of Mycobacterium smegmatis ATCC 19420 and Mycobacterium phlei ATCC 11758.
Conclusion: Streptomyces ribosidificus NRRL B-11466 produces antimycobacterial agents and this was confirmed genotypically via detection of 6 ORFs with high amino acid similarities (about 80%) to those located in the viomycin and related antibiotic biosynthetic gene clusters as well as phenotypically by determining its inhibitory activity against Mycobacterium smegmatis ATCC 19420. This is the first report about identification of genes putatively involved capreomycidine biosynthesis in Streptomyces ribosidificus NRRL B-11466
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
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