1,720,958 research outputs found
Soil compaction and plant performance of forage crops
No full textSIGLEAvailable from British Library Document Supply Centre- DSC:D86912 / BLDSC - British Library Document Supply CentreGBUnited Kingdo
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
Allelopathic effects of artemisia monosperma del. Ongermination and seedling growth of some range plant species
No full textArtemisia monosperma is observed to be as one of the first species todominate disturbed sand dunes in Saudi Arabia. Despite of its importance as asand stabilizer, it has no forage value. It is feared that this species may arrest thenatural succession of vegetation. A series of controlled environment experimentswas conducted to study the potential allelopathic effects of A. monosperma ongermination and seedling growth and survival of some species of sandy habitat(Lasiurus scindicus, Pennesetum divisum, Scrophularia hypericifolia, andPlantago boissieri). In one experiment, seeds were germinated in aqueousextracts prepared from leaves and inflorescence at a ratio of I: 10 weight tovolume. Seeds were also germinated in a polyethylene glycol solution having anosmotic potential similar to that of extracts and in distilled water for comparison.In a second experiment, seeds were sown in IO-cm pots filled with sand andcovered with a layer ofO, 1,2 or 3g ground foliage (leaves and inflorescence) tosimulate the effect of litter leachate on seedling growth and survival. In a thirdexperiment, the effect of root exudates on seedling growth and survival wasstudied by irrigating recipient plants with either tap water (control) or leachatesfrom intact one-year old A. monosperma plants grown in warm (30°C) or cool(20°C) temperatures. Results indicated that seed germination (except in S.hypericifolia) was partially controlled by the osmotic potential of extracts. Theaqueous extracts were not significantly different in their effect on germination.The impact on germination ranged between 50-60% reduction in L. scindicus to acomplete germination inhibition in S. hypericifolia and P. biossieri. Addition ofA. monosperma litter to soil surface decreased seedling relative growth rate(RGR) and survival in proportion to the amount of litter added. Artemisiamonosperma root exudates did not affect seedling biomass but reduced root toshoot ratio regardless of temperature, reduced RGR under warm temperature anddecreased seedling survival especially in S. hypericifolia where complete seedlingdeath occurred irrespective of temperature. These results have some practicalimportance when selecting for species in revegetation programs inA.monosperma- dominated sandy areas
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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