1,720,959 research outputs found
Scegliere le varietà di riso in base alla stabilità produttiva
No full textÈ stata condotta una verifica sulle differenze nella adattabilità ambientale per i dati produttivi e di performance agronomica e qualitativa per 15 varietà di riso. Per i parametri produzione e resa in grani interi, l’indagine ha evidenziato un sostanziale trend positivo ed ha consentito di identificare varietà delle classi Lungo A e Lungo B che mantengono buone prestazioni in diversi ambienti (diversi anni e località). Anche per il mal del collo e il brusone fogliare sono state identificate varietà che forniscono buoni livelli di protezione quando analizzate nel medio periodo. Nel complesso l’analisi denota comunque la necessità di indirizzare il miglioramento genetico verso l’ottenimento di piante dotate di più efficace adattamento alla variazione ambientale
La coltivazione del riso in regime biologico: i risultati della sperimentazione 2012
No full textWithin the frame of an experimental project on organic farming, cultivation trials were performed to characterize
rice varietal response on farms with expertise in rice organic farming cultivation. Selected varieties included recently
developed and traditional ones belonging to all different merceological classes. For the round rice group, the varieties
were Brio, Cerere, Ducato and Selenio. For the long A group, varieties were chosen according to their end use: Loto
and Opale, utilized for the production of parboiled rice while Ulisse, Meco and Volano for the national market. For
the long B group Arsenal, Ellebi and Salvo were tested. The experimentation revealed an average yield of about 6 t/
ha, therefore lower than those recorded under conventional farming conditions. The highest yield was observed in
Mede Lomellina (Pv) with Brio, Opale and Meco, being the best performing varieties with about 7 t/ha, while in
Valle Lomellina (PV) average yield was lower (5,9 t/ha) and the varieties with highest yield were Loto, Opale, Ulisse
(about 6,5 t/ha) and finally Selenio with about 8 t/ha. Considering also the availability of data derived from the
experimentation of the previous years, data highlighted that within the round group the varieties Brio and Selenio
were the most adaptable ones to organic farming conditions. Within the long A group, Opale for parboiled rice, and
Volano for national market demonstrated to provide good yield levels for the 3 years although the cultivar Volano had
serious lodging, while within the long B group, Ellebi was the best performing considering the three years of trials and
Arsenal showed good yield and high amylose content
La coltivazione del riso in regime biologico: i risultati della sperimentazione 2012-2013
No full textWithin the frame of a national project on organic farming, evaluation of rice varieties under organic farming conditions
was carried out during years 2012 and 2013. Selected varieties included recently developed and traditional ones
belonging to all different merceological classes. For the round rice group, the varieties were Brio, Cerere, Ducato
and Selenio. For the long A group, varieties were chosen according to their end use: Loto and Opale, utilized for the
production of parboiled rice while Ulisse, Meco and Volano for the national market. For the long B group, Arsenal,
Ellebi and Salvo were tested. The experimentation revealed an average yield of about 6 t/ha in 2012. In the 2013,
satisfactory yield were obtained in the Mede trials (about 6,4 t/ha), while in the trials of Cascine Strà the varieties
recorded average yield slightly higher than 3,2 t/ha, indicating that restriction in management under organic farming
may cause unsatisfactory yield values. In the two years of trials, all the round rice varieties (Brio, Cerere, Selenio e
Ducato) allowed high yield of wholly milled rice, confirming the good performances of this merceological class in
organic farming, while for the long A group, Loto, Meco and Opale were the best performing for this parameter in the
two years. Considering production yield and yield of wholly milled rice in the two years, the results therefore showed
that round rices (Brio, Cerere, Selenio e Ducato) provide the better results. Within the long A for parboiling, Loto
confirmed its reliability in the two years and in the different locations. It was instead more complicated to identify
other varieties with good performances since good results obtained in one year were frequently not confirmed in the
second year. However, in the first year the varieties Meco (long A for the national market), Salvo and Arsenal (long
B), while in the second year the variety Ulisse (long A for the national market) demonstrated good adaptability in at
least two field trials locations
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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