1,721,258 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
Influenza dei residui colturali e delle lavorazioni sull'umidità del terreno, sull'accrescimento e produzione del favino da seme e frumento duro.
No full textVariations 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
Agronomical aspects of officinal plant cultivation
No full textGreat interest in natural and aromatic plant cultivation arises from the need to guarantee a constant supply to industry in terms of quality and quantity. Their cultivation seems to be the only possible way to obtain these plants in industrial nations, especially if one considers the high cost of finding wild plants. Too often the cultivation of natural drugs in Italy is associated with rigid rules that exclude indispensable agronomic techniques such as fertilization, protection against parasites (animal and fungus) as well as weed control that involves the use of chemical compounds. At the present time, it is known that the commercialization of plants cultivated with chemical compounds present acceptable risks for man and are an indispensable means for high yields. Correct cultivation techniques cannot exclude consideration of the use of these substances (herbicides, fungicides, insecticides, fertilizers) usually used for other crops. The lack of knowledge on cultivation techniques in order to correctly carry out the choice of products to be used for plant protection as well as tillage methods is rather high, but it would not be necessary to set them up ex-nova. In fact, much research has been carried out in many nations on how to use modern economic techniques that can be partly adapted to our environment. It is interesting to point out that many species are cultivated on fertile soils and easily accessible to machines, and not on marginal areas which are often infertile and difficult to reach. Plants cultivated on the latter soils would certainly not have competitive costs compared with those cultivated in other nations that have lower labour costs
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
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