1,720,956 research outputs found
Viticultural zoning of Valtellina (Northern Italy)
No full textClimate, soil and vineyard performance were characterized in the northern Italian alpine valley of Valtellina to develop an eco-physiological model for zoning the district’s viticultural aptitude. Based on a representative sample of 54 small, steep-sloped terraced vineyards planted with the late-ripening red cv. Nebbiolo, the model included three-year (1998-2000) data sets for phenology, maturity curves, yield, vigor, and grape assays, with appropriate indices to manage these sets. Soils were characterized by pedological description and climate by both annual values of potential photosynthetically active radiation (PPAR) and estimated thermal fields expressed as growing degree days (GDDs) on base 10°C; PPAR ranged from 2700 to 3200 MJ m-2year-1 and GDDs from 1100 to 1800. Vineyards showed a 12-day range in phenological timings, with early sites showing the highest technological maturity and medium sites the highest phenolic maturity. Elevation and PPAR were the main environmental factors affecting vine budbreak and bloom date; veraison was also affected by crop load and its interaction with PPAR availability. Technological maturity was affected by elevation, phenolic maturity by crop load, and PPAR and its interaction were affected by crop load and elevation. The highest phenolic maturity was recorded in low cropping vineyards at low elevation and PPAR
Maturità fenolica del Nebbiolo in Valtellina: effetto dell’annata e del sito.
No full textNebbiolo is the dominant variety in Valtellina. The wide environmental variability, due to differences along the vineyard belt in elevation, slope and orientation angles, and to the ahead orographic profile, determine differences in thermal and radiative fields, which affect the technological and phenolic grape maturity. The course of grape ripening has been monitored during the 2001-2003 three year period in eight vineyards representative of the variability in the thermal and radiative availability of the vineyard belt. In the relatively normal years (2001-2002) the thermal resources seems to be the limiting factors the anthocyanin accumulation. The effect seems to be due either to the veraison precocity and to the thermal course during ripening with a greater effect of the temperature of September in respect of the temperature of October. On the contrary, the exceptionally high 2003 temperature was evidence for a negative effect of the excessive thermal availability on the anthocyanin accumulation. The simulation of the temperature effect on anthocyanin accumulation, based on the expected physiological effect, improved the understanding of the relationships among thermal status and phenolic maturity
Selezione e valorizzazione di enococchi autoctoni per la produzione di vino Rosso di Valtellina DOC e Valtellina Superiore DOCG
No full textSpatial distribution of solar radiation and its effects on vine phenology and grape ripening in an alpine environment
No full textClimate, soil and vineyard performance were characterized in the northern Italian alpine valley of Valtellina to develop an eco-physiological model for zoning the district’s viticultural aptitude. Based on a representative sample of 54 small, steep-sloped terraced vineyards planted with the late-ripening red cv. Nebbiolo, the model included three-year (1998-2000) data sets for phenology, maturity curves, yield, vigor, and grape assays, with appropriate indices to manage these sets. Soils were characterized by pedological description and climate by both annual values of potential photosynthetically active radiation (PPAR) and estimated thermal fields expressed as growing degree days (GDDs) on base 10°C; PPAR ranged from 2700 to 3200 MJ m-2year-1 and GDDs from 1100 to 1800. Vineyards showed a 12-day range in phenological timings, with early sites showing the highest technological maturity and medium sites the highest phenolic maturity. Elevation and PPAR were the main environmental factors affecting vine budbreak and bloom date; veraison was also affected by crop load and its interaction with PPAR availability. Technological maturity was affected by elevation, phenolic maturity by crop load, and PPAR and its interaction were affected by crop load and elevation. The highest phenolic maturity was recorded in low cropping vineyards at low elevation and PPAR
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
- …
