1,721,054 research outputs found
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
Seed germination in diverse apricot cultivars
No full textThe seeds of six apricot cultivars of various ripening dates were stratified, in Petri dishes at -1 and +1°C for 60, 90, and 120 days, to test germinability. When stratified for 120 days at +1°C, almost 70% rotted versus 0-6% at -1°C. While the higher temperature allowed 3-40% germination throughout stratification, and exposed the seeds to rotting, the lower temperature suppressed germination, and allowed flexibility of sowing date. After 30 days in a growth room the germination of the seeds exposed at -1°C for 120 days reached 100%, while those kept at +1°C had the highest rate after 60 days of stratification, ranging from 56-96% depending on the cultivar. The seedlings from seeds stratified at +1°C showed 90%, 50% and 15% rosetting after 60, 90, and 120 days respectively, while no rosetting was found with the -1°C treatment. Germination was correlated with lipid content (r=0.94) and seed dry weight (r=0.89), but not with protein (r=0.72), starch (r=0.49), or sugar (r=-0.47) content. Seed dry weight and lipid, sugar, and protein content, but not germination, were significantly related to time of ripening. Since germination rate was found to be correlated to seed dry weight and lipid content, attention must be paid to fruit ripening date, since early ripening genotypes accumulate less dry matter, and consequently give seeds with a low germination potential. Genotypes with low seed dry weight should be avoided as maternal parents in crosses, unless special care is taken to aid germination
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
Correlation between SESTAMIBI SCINTIGRAPHY-mammography, mitochondria and neoangiogenesis in breast cance
No full text.1 st European breast cancer Conference. Firenze 29 settembre-1 ottobre 199
Impiego di un programma integrato di bioattivazione per il controllo della polmonite micoplasmica attraverso il miglioramento della qualità ambientale
No full textAppropriate 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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