1,720,995 research outputs found
Efficacy of ozone against Rhyzopertha dominica adults in wheat
No full textAdults of a laboratory strain of the lesser grain borer, Rhyzopertha dominica (F.), were exposed to ozone concentrations of 0.42 and 0.84 g/m3 for up to 36 and 30 h, respectively, to estimate lethal time (LT) and lethal dose (LD) to kill 99% of insects at 28 °C and 65% r.h. After exposure, adult mortality was counted daily for 5 d. Adult progeny production data from ozone-exposed adults was used to estimate effective time (ET) and effective dose (ED) for 99% reduction in adult progeny production. At 0.42 and 0.84 g/m3, LT99 values for adult mortality on day 1 were 67 and 42 h, respectively. Corresponding LD99 values for adult mortality on day 1 were 28 and 36 g-h/m3, respectively. On day 5, LT99 and LD99 values decreased by 52–54% of day 1 values. The LT99 or LD99 values over days 1 through 5 decreased in a nonlinear fashion, suggesting delayed toxic effects of ozone. The ET99 value for reduction in adult progeny production was 22 h at an ozone concentration of 0.84 g/m3, whereas it was 39 h at 0.42 g/m3. Like LD99 values, ED99 value for adult progeny reduction at 0.42 g/m3 of ozone was lower than at an ozone concentration of 0.84 g/m3. Doubling the ozone concentration from 0.42 to 0.84 g/m3 did not reduce the LT99 or ET99 values by 50%. In general, the LD99 values on days 1 through 5 at an ozone concentration of 0.84 g/m3 were significantly greater than similar values at an ozone concentration of 0.42 g/m3, suggesting that R. dominica adults tend to be more susceptible when exposed to a low ozone concentration for extended time periods
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
Efficacy of ozone against stored grain insect species in wheat: laboratory and field observations
No full textAdults of the lesser grain borer, Rhyzopertha dominica (F.), were exposed to an ozone concentration of 0.43 or 0.86 g/m3 for 15-36 h or 4-30 h to estimate lethal time (LT) and lethal dose (LD, or concentration x time (Ct) product) to kill 99% of the adults at 28°C and 65% r.h. After ozone exposure adult mortality was counted daily for 5 d. At 0.43 and 0.86 g/m3, the LT99 values for adult mortality on day 1 were about 67 and 42 h, respectively. Corresponding LD99 values for adult mortality were 28 and 36 g-h/m3, respectively. On day 5, the LT99 and LD99 values decreased by 52 to 54% of day 1 values. Doubling the ozone concentration did not reduce the LT99 values by half. In general, the LD99 values on days 1 through 5 at an ozone concentration of 0.86 g/m3 were significantly greater than similar values at an ozone concentration of 0.43 g/m3. This suggested that R. dominica adults tend to be more susceptible when exposed for long time period to a low ozone concentration. In a bin holding 125 MT of hard red winter wheat, ozone was flushed through the grain mass for 5 d. Ozone concentrations at the plenum showed an increase from 0 to 0.107 g/m3. All adults of R. dominica; the rusty grain beetle, Cryptolestes ferrugineus (Stephens), Tribolium castaneum (Herbst), and eggs of the Indian meal moth, Plodia interpunctella (Hübner), in bioassays succumbed to ozonation. A laboratory strain and four phosphine-resistant field strains of the red flour beetle, T. castaneum, and a laboratory strain and two phosphine-resistant field strains of R. dominica were exposed to 0.43 and 0.86 g/m3 of ozone for 24 h. After one day of incubation following the 24h exposure, the mortality of the laboratory and phosphine-resistant field strains of both species was 100%
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
