1,720,983 research outputs found
CONSIDERAZIONI SUGLI SCAMBIATORI INDIRETTI A TUBI DI CALORE
No full textHeat pipe heat exchangers are typically made of finned pipes which transfer the heat between two fluids in counterflow: these fluids are completely separated. The effectiveness of these indirect type exchangers has been studied as a function of the classical parameters of heat transfer (NTU method). The temperature profiles of the heat exchanger, have been analyzed. A detailed comparison with the classical liquid coupled indirect type exchangers has been made for the first time
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
Analysis of wine phenolics by high-performance liquid chromatography using a monolithic type column
No full textEvoluzione della componente polifenolica in vino rosso affinato mediante tecnologie innovative
No full textInfluenza della tecnica in ambiente riducente sulla composizione e sul profilo sensoriale di vino bianco
No full textMechanical Harvesting Optimization and Postharvest Treatments to Improve Wine Quality
No full textAims
The aim of this work was to verify the influence of mechanical harvesting and postharvest treatments on wine composition.
Methods and results
Trials were carried out in triplicate on cv. Montuni grapes. The estimated best setting frequency for the mechanical harvester was 410 shakes/min. Comparing hand-picked and mechanically harvested grapes, the reduced extract and pH results were lower for the hand-picked grapes, showing a more evident berry breakage caused by the mechanical harvester. The wines obtained from mechanically harvested grapes had a lower phenolic compound content than wines produced with hand-picked
grapes, indicating that oxidation phenomena occurred; the trend for postharvest treated grapes was different. The significantly lower amount of higher alcohols in the hand-picked grapes trial than in the mechanically harvested ones could be explained by a lower amount of their precursors and oxygen in musts. The sensory differences among the trials were significant for some parameters, but an overall view of the data suggested that the differences were not remarkable and all the wines were good.
Conclusions
Postharvest treatments reduce the loss of natural antioxidant compounds found in wines produced from mechanically harvested grapes. Mechanical harvesting does not have a negative influence on wine composition if matched with the proper vineyard characteristics, machine settings and postharvest treatments. The typicality of Montuni wine is maintained in the cases of grapes harvested mechanically with, but also without, any postharvest treatment. The use of these treatments is otherwise useful to obtain wines with a better stability.
Significance and impact of the study
With respect to mechanical harvesting, this study highlights the importance of maintaining and/or improving the quality of mechanically harvested grapes containing the harvesting costs
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