1,720,961 research outputs found
A preliminary study on the authentication and traceability of extra virgin olive oil made from Taggiasca olives by means of trace and ultra-trace elements distribution
No full textExtra virgin olive oil (EVO) is among the most counterfeit foodstuffs in the present market. The Italian production is with no doubt one of the most valuable and therefore mostly counterfeit, due to the difficulty in checking the geographic provenance of olives. In order to provide a way for verifying the provenance of EVO, the role of microelements and, in particular, of lanthanides in the oil production chain has been studied. The distribution of lanthanides as determined by means of ICP-MS analysis appeared to provide a good tool for tracing the EVO production chain. Lanthanides and other microelements were then used for distinguishing a particularly prised EVO production from Liguria (northwestern Italy) made from Taggiasca olive variety, verifying that this production can be easily authenticated on the base of these chemical descriptors
Authentication and traceability study of Hazelnuts from piedmont, italy
No full textHazelnut is one of the most important items in high-quality food products from Piedmont, Italy. The
‘Tonda Gentile delle Langhe’ (TGL) variety is acknowledged all over the world as the best one, and it is
particularly appreciated when used to provide flavor in chocolate products. Authentication and/or
traceability studies must therefore be developed to safeguard this variety against fraud, which can
occur when the product is partially or totally substituted with hazelnuts of lower quality. In this work, a
classification of hazelnuts from different countries is presented, showing the possibility to discriminate
the TGL from other productions on the basis of the distribution of trace elements as determined by
means of inductively coupled plasma-mass spectrometry (ICP-MS), with particular reference to
lanthanides. Accuracy of the sample treatment procedure was tested by analysis of biological certified
materials. Data from elemental analysis were chemometrically treated with an unsupervised method,
such as principal component analysis (PCA), allowing for a good discrimination among groups
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
Role of Lanthanides in the Traceability of the Milk Production Chain
No full textThe traceability and authentication of milk were studied using trace and ultratrace elements as chemical markers.
Among these variables, the group of lanthanides resulted in being particularly useful for this purpose as a result of their
homogeneous distribution inside milk, which showed on the contrary to be intrinsically inhomogeneous from the elemental
point of view. Using in this pilot study milk samples from a factory in Piedmont (Italy), we demonstrated that the distribution of
lanthanides can be used as a fingerprint to put into relation the soil of the pasture land on which cows graze and the bottled milk
produced in the factory. In fact, the distribution is maintained nearly unaltered along the production chain of milk, apart from the
passage into the stomachs of the cows. Using the same variables, it was possible to discriminate between milk produced in the
factory and milk samples taken from the large-scale retail trade
Oxidative degradation of 1,5-naphthalenedisulfonic acid in aqueous solutions by UV-photolysis in the absence and presence of H2O2
No full textDispelling 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
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