1,720,984 research outputs found
The use of AFLP markers for cultivar identification in apricot
No full textAmplified fragment length polymorphism (AFLP) molecular markers
were employed for the fingerprinting of 118 accessions of apricot,
including cultivated varieties and related apricot species. Five primer
combinations were tested and 165 polymorphic bands produced which
could uniquely differentiate all accessions under investigation. Primer
combinations were rated according to the multiplex ratio, the
polymorphic index content and the discrimination power parameters
and superior combinations were identified. AFLP markers were used
in cluster analysis carried out with the UPGMA and the neighbourjoining
methods and parsimony analysis. Four groups of similar
accessions were identified: (i) those from the Mediterranean basin,
(ii) from China, (iii) from continental Europe and (iv) mixed Europe–
North America accessions. In the principal component analysis the
first three components accounted for 17% of the total variability
existing among accessions. Because the most important regions where
apricot is cultivated in the world were represented in the analysis, with
a large number of varieties, it was possible to discuss the data in the
light of current phylogenetic hypotheses on the origin and evolution of
the species
L’utilizzo di metodi automatici per l’analisi della forma applicati alla ricerca archeologica
No full textThe classification of shape (e.g. piece of potteries, motif identification, hieroglyphics classification) is a time consuming task for human being, therefore the objective to develop an automated system for shape classification is welcomed for many archaeologists, freeing them from tedious efforts. Moreover, due to the lack of human experts several artifacts are not studied, this problem could be alleviated using automated systems. A main problem of several proposed shape classifiers is that they need a parameters tuning in each different problem. We show that our system based on an ensemble of approaches is able to work in different applications exactly with the same parameters. This is a very useful for practitioners, with little knowledge of pattern recognition, that need a quick method for their shape classification problem. Two case studies are here reported: - automatic classification of the several diverse motifs that are used in the pottery of Kamares style (Cretan cultural production between the first half of the 2nd millennium BC); - pieces of pottery classification found in the area of the ancient port city of Class (Italy)
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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Characterization of low volatile coals for the developement of burners in retrofitting wall fired boilers
No full text- …
