1,720,956 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
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
COMPARATIVE STUDY ON THE ECOLOGICAL EFFECT OF DIFFERENT DRYING METHODS ON THE PHYTOCHEMICAL CONSTITUENTS OF THE LEAVES OF TRIDAX PROCUMBENS LINN
Get PDFThe role of plants in medicine cannot be over-emphasized; nearly all known conventional drugs have their composition to originate from plants. This medicinal properties possessed by plants can be attributed to some chemicals which are called phytochemicals produced in some parts of the plants. The ease in access to plants which is all around us, made individuals and households to become Doctors of their own. In that the hear-say knowledge of plants has led to people choosing plants for treatment of sicknesses over conventional drugs. Locally, there are various ways individuals prepare their herbal medicine, and they include; boiling, drying under the sun and air drying etc. This study was aimed to know the extent to which some of these methods of herbal medicine preparation (sun drying and air drying) affect the phytochemical composition of some plant parts. The leaves of Tridax procumbens were used for this study, and it was evaluated for total saponin, total flavonoids and other secondary metabolites using standard procedures. The study of two different samples from the aforementioned two different methods of herbal medicine preparation reveals the presence of saponin, tannin, alkaloid, flavonoid, steroid. The air dried sample gave higher composition of saponin (1.85±0.03), flavonoids (1.34±0.03), tannin (2.51±0.02), alkaloids (1.49±0.02) and steroid (0.26±0.02), there is significant difference between the phytochemicals seen in the two samples. Thus, this reveals that the air drying method will have little effect on the phytochemical constituent of the leaves, and can be preferred over sun drying in preparation of herbal medicine
Ecological Study of Aspilia africana and Sida acuta and the Comparative Study of Their Phytochemical Constituents
No full textAspilia africana and Sida acuta are two plant species that are widely distributed across Africa and are used in traditional medicine for various ailments. In this study, we aimed to compare their ecological characteristics and phytochemical constituents. Field surveys were conducted in selected sites across Nnamdi Azikiwe University, Awka, Nigeria to assess the distribution and abundance of the two species. Data on soil type, rainfall, temperature, and altitude were also collected to determine the ecological factors that influence their growth and distribution. Our results showed that A. africana was more widely distributed and had a higher abundance than S. acuta. A. africana was found in a wide range of ecological conditions, including grasslands, savannas, and secondary forests. S. acuta, on the other hand, was found mainly in disturbed habitats such as farmlands, roadsides, and waste grounds. Both species were found to be adaptable to a wide range of soil types, but A. africana had a higher preference for sandy soils while S. acuta was more commonly found in loamy soils. Phytochemical screening was carried out on samples of the two species collected from different sites. The presence of secondary metabolites such as alkaloids, flavonoids, tannins, and phenols was determined using standard procedures. Our results showed that both species contained varying concentrations of these secondary metabolites. A. africana had higher concentrations of alkaloids, saponins and tannins (4.20±0.05 mg/100g) of total saponins, (1.18±0.04 mg/100g) of total glycosides, (8.22±0.40 mg/100g) of total alkaloids, (0.40±0.01 mg/100g) of total steroids, and (2.23±0.03 mg/100g) of total tannins, while S. acuta had higher concentrations of flavonoids and saponins (0.28±0.05mg/100g) of total saponins, (0.55±0.02 mg/100g) of total flavonoids, (2.31±0.03 mg/100g) of total alkaloid, (1.51±0.02 mg/100g) of alkaloids, (1.85±0.04 mg/100g) of total steroids. These findings suggest that A. africana and S. acuta may have different medicinal properties and potential applications. Flavonoids and phenols have been reported to have antioxidant, anti-inflammatory, and anticancer properties, while alkaloids and tannins are known for their antimicrobial and analgesic activities. Further studies are needed to explore the pharmacological activities of their phytochemical constituents and validate their traditional uses in African medicine
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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