1,720,968 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
Effects of different water regimes on berry metabolism and composition of Aleatico grapevine
No full textThis work reports the results of a trial carried out on ‘Aleatico’ grapevine, a cultivar cultivated along Tuscany coasts and in Elba Island, from which a typical dessert wine is produced after partial postharvest dehydration of berries. Two different water regimes were applied in the vineyard: not irrigated (water stress, WS) and partially irrigated (moderate water deficit, MWD). WS conditions determined a decrease of stem water potential (SWP) that reached values lower than - 1.4 Mpa, whereas in MWD these SWP levels were registered only for short periods. Significant differences in stomata conductance and net photosynthetic rate values were observed between the two treatments. At harvest, berry weight was reduced of about 20% in WS plants. An effect of similar magnitude was detected for skin
weight, while seed weight was not affected. The sugar accumulation process was more pronounced in WS berries and this was paralleled by higher titratable acidity values both at veraison and harvest. Skin anthocyanin content was determined in laboratory and by a fluorimetric method, using the optical sensor Multiplex®2, an
innovative portable instrument based on chlorophyll fluorescence, that nondestructively analyzes the berries in the field, under natural light. WS induced a significant increase of anthocyanin biosynthesis as their content resulted to be higher than that of MWD samples. The cultivar ‘Aleatico’ appeared to be quite tolerant to
water stress conditions and this information could be useful also for setting up targeted postharvest dehydration strategies to produce dessert wines. An additional interesting result is represented by the validation of the use of a portable nondestructive instrument to measure skin anthocyanin content directly in the vineyard
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
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
Rapid and non-destructive method to assess in the vineyardgrape berry anthocyanins under different seasonal andwater conditions
No full textAbstract
Background and Aims: Monitoring of anthocyanins (Anth) in winegrape (Vitis vinifera L.) is fundamental for the
production of top-quality red wines. This work was aimed at testing a new fluorescence-based sensor for Anth
detection in the vineyard.
Significance of the Study: The present study showed a new important innovative technology for viticulture. The
sensor evaluation of the large spatial and temporal heterogeneity in Anth accumulation can be useful as support
parameter in the harvest date decision or for vineyard zoning of phenolic maturity.
Methods and Results: Anth in grape (cv. Aleatico) bunches attached to the vine were monitored non-destructively
in the field using a fluorescence-based sensor during the 2008 and 2009 seasons and under different water regimes. The
ANTHRG index = log(far-red-fluorescenceR/far-red-fluorescenceG), with fluorescence signals excited with red (R) and
green (G) light, was inversely correlated through an exponential function (r2 = 0.875) to the Anth concentration
derived from the HPLC analysis of berry skin extracts. ANTHRG was effective in detecting the earlier ripening process in
2009 with respect to 2008 and differences in the Anth accumulation between seasons and in relation to different water
regimes.Water deficit imposed in 2009 enhanced Anth concentration in berries because of a reduction in berry size but
also an increase of Anth biosynthesis. This effect was observed by both destructive and ANTHRG non-destructive
measurements.
Conclusions: Our results show that the employed fluorescence sensor represents a reliable, rapid and non-invasive
tool for monitoring and determining Anth accumulation in situ
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