1,720,983 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
A comparison trial of of vermicompost teas as hydroponic nutrient solutions against commercial fertilizers: identifying nutrients and plant production
No full textWhile vermicompost teas have many documented benefits, including increased plant growth and pest and disease suppression, less is known about the use of vermicompost teas as a source of nutrients in hydroponic systems. This experiment explored the application of vermicompost tea in hydroponically grown lettuce (Lactuca sativa), as compared with commercially fertilized plants. Lactuca sativa was grown hydroponically in floating rafts over two consecutive three-week cycles and was applied with commercial inorganic fertilizer, commercial organic fertilizer, or vermicompost fertilizer. Wet and dry above- and below-ground biomass, chlorophyll levels, root length were measured, along with levels of soluble nitrate and ammonium in each treatment reservoir. Average above-ground biomass, root length, and chlorophyll were significantly lower for vermicompost treatments as opposed to the other two treatments. Although the vermicompost treatment showed significantly lower plant production, mean nutrient levels were not significantly different except for ammonium and sulfate. More research is needed to further explore nutrient levels and plant production with vermicompost tea applications in hydroponic systems. Further studies may also indicate if vermicompost teas alone can enable yields that are similar to those experienced with commercial fertilizer applications or if a combination of vermicompost tea and an additional fertilizer application is necessary.Agricultural Science
Variations on the Author
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Invited Lecture by Subhrajit Saha
No full textInvited lecture given by Subhrajit Saha at Agronómico Tropical de Investigación y Enseñanz
Oral Presentation at the International Conference on Agriculture, Biology and Environmental Sciences
No full textOral Presentation given by Georgia Southern faculty member Subhrajit Saha at the International Conference on Agriculture, Biology and Environmental Sciences in Bali, Indonesia, December 8 – 9, 2014
Poster in Symposium on Agroecology for Food Security and Nutrition’ organized by the FAO, United Nation
No full textPresentation given by Subhrajit Saha at Symposium on Agroecology for Food Security and Nutrition organized by the FAO, United Nation, Rome, Italy on September 18 – 19
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