1,720,974 research outputs found
Dehydrofrozen sweet organic cherry : the influence of an osmotic pre-treatment and cultivar on colour stability
No full textSweet organic cherry (Prunus avium) is worth processing for its important nutritional value, linked to high anthocyanin content. Osmo-dehydrofreezing, a combined process where freezing is preceded by an osmotic dehydration step in concentrated sugar solution, could be the method of choice in order to maintain the original quality of fruit. The purpose of the present work was to evaluate the influence of sweet cherry cellular structure, linked to cultivar, on solid-liquid exchanges and on colour modification during osmotic dehydration. Moreover the effect of the osmotic step on composition parameters and colour of sweet cherry during frozen storage was studied. Nine cultivars of sweet organic cherries were processed: two grown in the South and seven in the North of Italy. According to literature data, osmotic dehydration was carried out for 45 min at 25°C in a 65% (wt/wt) sucrose solution. Freezing was carried out at – 50°C air temperature and 4m/s air speed. Frozen and osmodehydrofrozen sweet cherries were stored at – 20°C up to 9 months.
Solid-liquid exchanges were quite low, as already cited in literature, and they were influenced by the cultivar. The faint lightening of colour, caused by the process and related to a decrease of both a* (redness) and b* (yellowness) values, was linked to solid-liquid exchanges: the higher the exchange, the greater the difference in colour, except for Giulietta and Adriana. These cultivars behaved in an ideal way showing a fairly high concentration index with very limited colour modification. During frozen storage the osmotic pre-treatment helped towards keeping the original cherry colour: the extent of the protection was linked to the cultivar.
The results, besides confirming the utmost importance of fruit tissue structure, evidenced that it is only by a strict interaction between two factors, the choice of the right cultivar and the correct treatment, that high quality processed sweet organic cherry can be obtained
Ricerche sul comportamento degli ortaggi alla congelazione rapida. Nota VIII. Idoneità varietale della fava da mensa. , XVI, 53.
No full textRicerche sulla surgelazione delle brassicacee.Nota II. Idoneità varietale dei broccoli e delle cime di rapa.
No full textGoing 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
- …
