1,721,021 research outputs found
La pressatura a membrana per preservare la qualità dei vini
No full textLe moderne presse a membrana mostrano due limiti importanti: la discontinuita dell’impiego e il deflusso del mosto nella stessa direzione della forza esercitata che ostacola in parte l’estrazione e impone tempi lunghi di lavoro.
Una recente proposta ancora in fase di sperimentazione presenta tutte le caratteristiche per superare questi limiti e rendere il sistema di pressatura a membrana più pratico ed efficiente nel rispetto della qualità dei prodotti lavorati.
Il prototipo è costituito da due unità poste in sequenza: la prima di sgrondo/pressatura, per ottenere mosti di prima qualità, la seconda di pressatura continua a vite, per estrarre efficacemente la frazione residua di minore pregio
La prima componente, caratterizzata da due membrane elastiche e da due superfici di sgrondo, è interna ad un serbatoio verticale, in cui il prodotto viene caricato dall’alto lateralmente per essere sgrondato, pressato e spinto nella parte basale dove la seconda componente, costituita da una coclea e da una forata cilindrica esterna, provvederà al suo completo esaurimento. Le prime indicazioni operative confermano la validità del progetto per la qualità dei mosti estratti e per la migliore gestione del lavor
Technical and economic evaluation of maceration of red grapes
No full textFor red wines, the phase of maceration is fundamental as it affects important features such as colour, aroma and flavour. For wines for everyday consumption these features must provide an easily drinkable product with a good quality basis that is consistent over time. In recent
years two methods of maceration seem to guarantee these objectives better than others, while also allowing good work organization and automation: hot maceration and pneumo-carbonic pumping over.
These techniques have been evaluated in a large winery, defining their production potential, labour requirements, energy consumptions and economic costs. Chemical and sensory evaluations were carried out on wines produced from grapes with the same characteristics
Mechanical grape harvesting: Investigation of the transmission of vibrations
No full textThe effects of harvester beater frequency on crop yield and quality and the interactions between machine and plants were evaluated. The frequency of the shaker (five settings ranging from 370 to 450 beats min1) was varied during an experiment conducted on a free spur of a pruned cordon-trained Lambrusco variety vine. The stresses transmitted by the machine to the plant were measured using accelerometers placed on both the supporting wires and the vine shoots. The yield and condition of the harvested grapes, the production losses and defoliation of the plants were recorded. The results supply important information on the regulation of the beater frequency for optimising yields and quality levels of the harvested grapes: the variation of frequency modifies not only the number but also the intensity of the vibrations and has a significant effect on yield losses, with contrasting trends between the visible and concealed losses
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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