1,721,304 research outputs found
Perspectives de recherches en protection phytosanitaire du cotonnier dans un contexte d'intensification écologique des systèmes de culture
Full text linkGoing 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
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
Stylosanthes reduces weed infestation in upland rice cropping systems in the Mid-West of Madagascar
Full text linkIn the Mid-West of Madagascar, upland rice is highly suffering from low soil fertility and weed
pressure. Farmers cannot afford herbicides and rely entirely on a labour-intensive hand weeding.
Recently, a no-till system with stylosanthes, a legume cover crop managed as living mulch, has
been introduced. It has been proven to enhance soil fertility, but its effect on the weed community
was not yet studied. This work aims at assessing the effect of stylosanthes on weed abundance,
weed composition, and rice yield. Field experiments were conducted at Ivory station, Mid-West
of Madagascar (19°33.29’S, 46° 24.913’E) in 2016 and 2017. Two factors were tested in a split-plot
design with 6 replications: main plot factor was soil management (conventional tillage [CT] vs. notill
with stylosanthes [NT]), and sub plot factor was fertilization (manure [F1] vs. manure + NPK +
urea [F2]). Weedy and weed-free plots were set up in each factor combination. Stylo-plots (rice and
stylosanthes alone, weeds were removed) were set up only in NT, to test potential competition
between stylosanthes and rice. Data collected were total weed cover at 60 DAS, rice yield and
weed biomass at harvest (grass weeds, broadleaved and sedge separately). Fertilization did not
significantly affect total weed cover. Total weed cover was around 65% lower in NT than in CT in
both years. Weed biomass at harvest showed that this reduction was mainly due to a decline of grass
weeds, as they were the most important functional group in all systems. In CT, rice yield losses due to
weeds were around 50% and 85% respectively in 2016 and 2017 showing an important year effect. In
NT, rice yield losses due to stylosanthes + weeds were around 50% in both years. Rice yield loss due
to stylosanthes alone was not significant
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
Malherbologie - Expérimentation sur les herbicides en culture de canne à sucre : rapport de mission en Guadeloupe du 8 au 20 avril 2002. Programme européen DOCUP 2000-2006. Contrat d'entreprise du Cirad-Ca - 1ère tranche. Programme de travaux d'appui au développement de la canne à sucre. Rapport d'activités - seconde partie
Full text linkCette mission en Guadeloupe, qui s'est déroulée du 8 au 20 avril 2002, portait sur le désherbage des cultures de canne à sucre et sur la mise en place d'une expérimentation sur les herbicides. Ce rapport présente un recensement rapide des mauvaises herbes et des pratiques de désherbage de la canne à sucre en Guadeloupe, ainsi qu'un bilan succinct des produits herbicides actuellement employés. Ensuite, il reprend les propositions de protocoles expérimentaux et de fiches de suivis faites au CTICS pour Ià réalisation des essais d'herbicides selon la méthode C.E.B
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