1,720,984 research outputs found
La Regina Viarum e la via Traiana. Da Benevento a Brindisi nelle foto della collezione Gardner
No full textUtilizzo di traccianti geochimici nella Limonicoltura Siciliana.
Full text linkNell’ultimo decennio i consumatori hanno sviluppato un interesse crescente per la tracciabilità dei prodotti agroalimentari in particolare in relazione all’origine geografica.
La conoscenza di una possibile relazione chimica tra suolo e prodotti agroalimentari è importante per valutare la provenienza e autenticità dei prodotti. Tutto ciò va a favore del consumatore e si traduce in maggiore sicurezza e qualità dell’alimento.
La coltivazione del Limone (Citrus Limon (L.) Osbeck) è una delle più importanti colture al mondo e l'individuazione di potenziali frodi potrebbe essere migliorata studiando la sua composizione chimica che lo lega all’area di origine.
Questo studio ha utilizzato le terre rare (REY), un gruppo di 14 elementi chimici che vanno dal Lantanio al Lutezio più l’Ittrio, che si sono dimostrate molto interessanti per l’utilizzo come traccianti geochimici a causa del loro comportamento che è generalmente coerente e prevedibile [1,2].
Lo scopo di questo lavoro è quello di applicare tale tecnica alle due IGP di limone siciliano:
-IGP Limone Interdonato, zona di origine riviera ionica, provincia di Messina;
-IGP Limone Siracusano, zona di origine provincia di Siracusa;
per verificare se i frutti riproducono la stessa distribuzione delle REY presenti nel suolo.
Analogamente a quanto riportato in precedenti lavori, abbiamo valutato la distribuzione delle REY nel sistema limone-suolo.
I campionamenti di suolo e dei frutti sono stati effettuati nelle aziende ricadenti all’interno delle aree dell’IGP. Come da disciplinare le cultivar prese in considerazione sono Interdonato per l’IGP Interdonato e Femminello Zagara Bianca per IGP Siracusa. I campionamenti di controllo sono stati effettuati presso azienda situate nel territorio di Trapani e di Messina (riviera Tirrenica) dove sono coltivate entrambe le cultivar.
Le relazioni tra succo, frutto e suolo sono state calcolate grazie alla determinazione delle concentrazioni delle REY, e ai rapporti REY pesanti (dal La al Gd) REY leggeri (dal Tb al Lu + Y) HREE/LREE. I primi risultati ottenuti di questo approccio geochimico sono discussi
Distribution of REEs in soil-citrus limon system(L.) Osbeck
Full text linkThe consumers have an increasing interest about food traceability with respect to safety, quality
and typicality issues. The knowledge of a chemistry relationship between the soil and the
agricultural products is an important tool for the quality assessment of food. Citrus Limon is the
most important fruit tree crop in the world and the detection of potential fraud could improve by
using tools linking the chemistry composition of this production to its typical growing area. This
study use rare earth elements (REEs) as geochemical tracers. The REEs are a set of 14 elements,
from lanthanum to lutetium that can be divided in light rare earth elements (LREEs), from La to Gd
and heavy rare earth elements (HREEs), from Tb to Lu. The REEs have recognized as very useful
tracers due to their generally coherent and predictable behaviour. The aim of the research is to
observe whether the fruits of various cultivars of citrus cultivated on the same soil and their
products (fruit and juice) reproduce the same distribution of REEs. Taking into account of our
previous works carried out on grapevine – soil system [1,2], we applied the same technique to
evaluate and trace the REEs distribution in soil– Citrus Limon fruits system. Sampling of soil and of
fruits was carried out in the CREA experimental farm located in Acireale (CT, Sicily) where are
present several Citrus Limon cultivars cultivated in Sicily. The REEs amount, the HREEs/LREEs
relations and their distribution in the fruit and citrus juice with respect to the own soil were
determined and calculated. The intriguing results obtained with a geochemical approach are the
first on the soil–Citrus Limon fruits system
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
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
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