1,720,976 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
Processing tomato quality as affected by irrigation scheduling
No full textIn Southern Italy the paucity of water is a very important problem and due to the fundamental
importance of the water for the processing tomato, in this study the influence of irrigation on processing
tomato quality was investigated in the years 2002 and 2003. A hybrid processing tomato (Lycopersicon
esculentum L. Mill cv. Ability) was treated with different water regimes obtained combining amount of
water and irrigation interval. The effects of the trials were evaluated taking into account the physical and
chemical characteristics of the fruits, as well as the content in antioxidants moieties. Furthermore, the
relationship among all the quality parameters and the seasonal amount of irrigation water was
evaluated.
The results, comparing different water regimes obtained combining amount of water and irrigation
interval, gave useful indications on the possibility to improve nutritional tomato quality by reducing
irrigation water during tomato cropping. In particular, relatively to the Mediterranean areas of tomato
cultivation and to the texture of the soil considered in this study, the best compromise between quality
and quantity of the processing tomato fruit was achieved both with the extension of the irrigation
interval (L40 or L60) and with the limitation of irrigation volume for the second part of the tomato crop
cycle (thesis 100-50). Extending the irrigation interval and limiting irrigation volume for the second part
of the tomato crop cycle, appeared to be the best management strategy to optimize the yield and
nutritional quality of processing tomato
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
Effect of chilling on the ascorbic acid content of fennel during storage
No full textThe ascorbic acid content in fennel during storage at 6 °C and 90% R.H. was monitored over a 32 days period and a rapid extraction method was developed to quickly analyze the samples. The concentration of the acid showed a marked decrease during the first 4 days of storage, with a reduction of about 50%. In the following two weeks the ascorbic acid content remained almost unchanged, but extending the storage up to 32 days caused further substantial losses and the final ascorbic acid concentration reached 25% of the initial one. This phenomenon was found to be independent from the sample size
Impiego della tecnica FT-NIR per la determinazione rapida del contenuto di etanolo in prodotti da forno
No full textIn foodstuffs such as bread and snack cakes the use of EtOH as preservative agent or for adding flavours is very common and the rapid assessment of its level in the products is of the utmost importance for the bakery industry. In this work the use of FT-NIR has been investigated for the assessment of the EtOH content in 3 different kind of bread up to a maximum level of 2% (w/w dry matter) as well as in 7 snack cakes with different fillings up to a maximum level of 1% (w/w). Due to the great difference among the breads and the snack cakes, it has been necessary to develop a specific milling and mixing procedure for each product before running the FT-NIR analysis. Over 150 spectra were acquired for each item and by using chemiometric methods it has been possible to develop specific predictive models for each product. The analytical procedure was then validated also with reference to analytical data obtained by gas chromatography according to an Italian official method of analysis for EtOH content in bakery products
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