1,720,978 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
Shoot growth and bud topology in 'Chandler' walnut
No full textIn walnut (Juglans regia L.), the distribution and the type of bud complex are important for the application of disbudding techniques aiming to shoot growth manipulation in the different training systems. To ascertain differences in bud topology related to the propagation technique, a study was carried on 1-year-old 'Chandler' trees, micropropagated (M) and grafted on walnut seedlings (G), in two orchards located in Emilia Romagna region (45°North), Italy. Bud complexes were classified as follows: 0 - blind node; 1 - secondary bud alone; 2 - primary bud alone; 3 - primary and secondary bud very close each other; 4 - primary and secondary bud well distanced each other; 5 - very short sylleptic shoot without secondary bud; 6 - very short sylleptic shoot with secondary bud; 7 - extended sylleptic shoot. The number, the position along the axis and the length of shoots developed in the 2017 growing season were also measured. The results evidenced that on average, micropropagated plants had a similar bud distribution along the shoot in comparison with grafted trees in the different experimental fields. Moreover, the internode length varied along the shoots with different fate of the buds, apparently according to shoot growth rate. The sylleptic growth was closely related with a longer internode while single primary buds were detected where the internode was shorter, in not dependent way. The bud topology was described also in 8-year-old micropropagated 'Chandler' trees, samples of 4 different branching structures were selected in mid-October 2017: 4-year-old branch, 2-year-old branch, 1-year-old shoot, sylleptic shoot. Shoots were classified according to their branch age and then the number of nodes, branching and length were measured to determine branch architecture and age. All the buds were excised and dissected, and their apices were examined under stereomicroscope. The fate (vegetative bud, female floral bud, male inflorescence, lateral shoot, blind node) of each axillary structure was evaluated according to the position along the axis. The bud content was noted recording the number of the appendages (cataphylls and developing embryonic leaves). Terminal buds were investigated also in 3 micropropagated plants and 4 apical shoots of young trees (2 years old). The female flower buds were more frequent in lateral bud of the medium terminal portion of the shoot. The flower in secondary buds were only male
Micropropagated vs. grafted 'Chandler' trees in young walnut orchards
No full textThe response of micropropagated (M) and grafted (on walnut seedlings, G) 'Chandler' trees to the current training techniques for central leader system is being compared in a number of commercial orchards of the Emilia-Romagna region (44-45°N), Italy. In an orchard planted in winter 2016/17 using 0.10-0.20 m, 8-month-old M and 1.85 m, 33-month-old G trees, spaced 7×5 m (286 trees ha-1), the length of the shoot selected as the leader, the number of leaves and of the sylleptic shoots on the leader were recorded at 15- to 30-day intervals throughout the first growing season. Except for the beginning of the growing season, where M trees showed a more vigorous growth resumption, the growth rate of M and G trees did not show significant differences during the season. The vigor, internode number and length of the leader of M vs. G trees at the end of the 1st growing season were studied in 7 additional orchards, established the previous year (winter 2015/16) and with the same planting system. The bud-break percentage in the 2nd growing season following the head-back and partial disbudding of the terminal portion of the leader, was recorded as well. Regardless the orchards, the M trees resulted comparable or 10-15% higher than G trees, although the M material at planting was younger and undersized compared to G material. Moreover, variability in tree size was lower in M trees, allowing more homogeneous trees in the orchard, which is an important requisite in the modern walnut industry
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
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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