1,721,165 research outputs found
Study on the detection of genetically modified maize GA21, NK603 and MON810 by a multiplex PCR method.
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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
The relation between spatial ability and math : the mediating roles of numerical magnitude knowledge, understanding of arithmetic operations and word-problem representation
No full textThe current study aims at investigating the relation between spatial ability and children’s math performance, as well as exploring whether their relations are mediated by numerical magnitude knowledge, understanding of arithmetic operations, and word-problem representation. A sample of 221 sixth graders completed a series of tasks measuring their spatial abilities, numerical magnitude knowledge, understanding of arithmetic operations, word problem representation, and math performance, as well as other potential confounding factors such as intelligence and working memory. Results from structural equation modeling indicated that spatial ability is the significant predictor of math performance, even after controlling for the confounding variables. Besides, the three math components (numerical magnitude knowledge, understanding of arithmetic operations, and word-problem representation) partially mediated the predictive effects of spatial ability on math performance. The results supported the predictive role of spatial ability in math performance and further confirmed the mediating roles of numerical magnitude knowledge, understanding of arithmetic operations and word-problem representation. This study served as the first study to include the three math components in a path model, which allows the author to examine their unique contribution to math performance. The findings provide researchers and educators with a more comprehensive view of the linkage between spatial ability and math performance thus informing educators for the design of interventions in children’s math performance.published_or_final_versionPsychologyMasterMaster of Philosoph
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
The mediating role of non-symbolic magnitude processing and symbolic-nonsymbolic mapping in the relation between spontaneous focusing on numerosity and mathematical achievement
No full textWhen given something to observe, individual may pay attention to different aspects, such as colour, size and quantity. Research has shown that children who have the self-initiated tendency to focus on numerosity (i.e., spontaneous focusing on numerosity; SFON) performed better in mathematics and the relation could be observed years later the test. To better understand the mechanism behind, this longitudinal study examined the potential mediating roles of non-symbolic magnitude processing and mapping between symbolic and non-symbolic representation in the relation between spontaneous focusing on numerosity and mathematical achievement. One hundred and fifty kindergarteners (M =52.4 months, SD = 4.6 months) were recruited and tested at three time points. They were first assessed in the second semester in lower kindergarten (Time 1), and reassessed in the first semester (Time 2) and second semester (Time 3) in upper kindergarten.
Mediation analysis showed that there were two independent pathways leading from spontaneous focusing on numerosity to mathematical performance, namely the numerosity pathway and the mapping pathway. The findings contributed to the existing literature by providing a better model that explained how spontaneous focusing on numerosity predicted children’s later mathematical achievement. Activities which nurture SFON tendency may be included in the kindergarten curriculum as they may be potentially useful to promote young children’s later mathematical success.published_or_final_versionPsychologyMasterMaster of Philosoph
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