1,720,954 research outputs found
Rhizome Propagation Methods of Lowland Bamboo (Oxytenanthera abyssinica) in Central Tigray, Northern Ethiopia
No full textBamboo is a plant species that has a range of economic, environmental, and sociocultural importance. Bamboo can be propagated through sexual and asexual propagation methods. Both methods have their own advantages and disadvantages. This study aims to evaluate different rhizome cutting materials that are relatively suitable for large-scale plantations. The materials for propagating bamboo by vegetative means are whole or portions of the rhizomes, each with a single culm having two to six basal nodes, preferably 1- to 2-year-old culms from the peripheral portion of the clump having 2, 4, 6 basal nodes and 1.5-2 cm, 2-4 cm, and 4-6 cm in diameter. The design of the experiment is a split plot design with three replications and nine plots. This experiment is laid in 1029 m2 (21 m x 49 m). The size of each plot is 45 m2 (15 m by 5 m), and the distance between plots and plants in plots is 2 m. The number of nodes is assigned in the main plot, and the diameter of the planting material is assigned in the subplot. There are a total of 9 treatment combinations and a total of 108 planting materials. Significantly higher (P = 0.01) mean survival rate (59%) was observed in the planting material with two basal nodes and 2-4 cm diameter and the planting material with six nodes and 2-4 cm diameter. Further research is crucial to devise effective vegetative propagation methods for large scale plantations without compromising the survival capability of the planting materials
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
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
Adaptation and Growth Performance of Different Introduced Bamboo Species in Central Tigray, Northern Ethiopia
No full textBamboo is a giant bushy grass and typically a faster growing perennial than any other tree species and it starts to give utility within three or four years of planting time, except bearing seeds. The study was conducted on four bamboo species (Bambussa bambos, Phyllostachus edulis, Yushania alpina, and Bambussa vulgaris) to evaluate their adaptability potential and growth performance at Laelay Maichew district, central zone of Tigray, Ethiopia. The design of the experiment was carried out using a randomized complete block design (RCBD) with three replications. The distance between the experimental plots and blocks was 2 m and 3 m, respectively, and the spacing between bamboo seedlings in the plot was 2 m x 2 m, with 4 bamboo seedlings per plot. A total of 48 bamboo seedlings were planted in the experimental site. The growth parameters; including survival rate, new emerging shoot, internode length, number of nodes, culm height, culm diameter, and root culm diameter were measured and recorded. The collected data were statistically analyzed using one-way analysis of variance (ANOVA) between treatments following the post hock test of Tukey at P<0.05 using SPSS for Windows version 20. The results revealed that Bambussa bambos has a better survival percentage (100%), followed by Bambussa vulgaris (58.3%), Yushania alpina (41.67%), and Phyllostachus edulis (0 %). The growth parameters: new emerging shoot (culm), collar diameter, diameter at stump height, and diameter at breast height of Bambussa bambos were significantly higher than those of Yushania alpina and Bambussa vulgaris (P=.001). However, for similar parameters, Yushania alpina showed non-significant variation with Bambussa vulgaris (at P>0.05). The mean heights between treatments (Bambussa bambos (5.1 m), Yushania alpine (4.5 m), and Bambussa vulgaris (4.2 m)) were observed statistically non-significantly different (at P=.26).The other growth parameters were: the mean value of total internode length(TIL) and middle internode length (MIL) of Bambussa bambos was significantly higher than that of Bambussa vulgaris (at P<0.05). The study revealed that, among the four bamboo species, Bambussa bambos showed higher growth performance and adaptability potential, followed by Yushania alpina and Bambussa vulgaris. As a result, the best-performing introduced bamboo species (Bambussa bambos) could be promoted to end users in related agro-ecological areas for various benefits. Further studies should be recommended on the adaptability of the introduced bamboo species in other agro-ecologies
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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