1,721,054 research outputs found
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
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
QuEChERS method for the determination of PAH compounds in Sardinia sea urchin (Paracentrotus lividus) roe,using gas chromatography ITMS-MS analysis
No full textSea urchin roe (Paracentrotus lividus) is an excellent biomarker and it has been usedas a test for toxicology study of chemical pollution of restricted marine areas, infact,unlike mussels which filter water it feeds mainly of micro and macro algae. Therefore itnot influenced by sea tide and meets better the situation of local pollution. A modifiedQuEChERS extraction method coupled with gaschromatography iontrap massspectrometry (ITMS/MS) analysis has been used to set up a method for thedetermination of 17 polycyclic aromatic hydrocarbons (PAHs) in Paracentrotus lividussea urchin roe. A method validation was performed and the following parameters havebeen determined: instrument limit of detection (LOD) and of quantification (LOQ),precision, recovery and linearity. The method carried out showed good LOD under 1.5ug/kg and LOQ under 5 ug/kg for all PAHs studied and were in close agreement withquality criteria described in the Commission Regulation (EC) No 333/2007 concerningthe PAH benzo[a]pyrene in foodstuffs. Precision and linearity were in accordance withEC SANCO/10684/2009 values. For all PAHs recoveries ranged from 72 to 119 %,with RSD ranging from 3 to 17 % in the most unfavorable case
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
LC/DAD/ESI/MS method for the determination of Imidacloprid, Thiacloprid and Spinosad in Olives and Olive Oil after field treatment
No full textThe behavior in the field and the transfer from olives to olive oil during the technological process of imidacloprid,
thiacloprid, and spinosad were studied. The extraction method used was effective in extracting the analytes of interest, and no
interfering peaks were detected in the chromatogram. The residue levels found in olives after treatment were 0.14, 0.04, and
0.30 mg/kg for imidacloprid, thiacloprid, and spinosad, respectively, far below the maximum residue levels (MRLs) set for these
insecticides in EU. At the preharvest interval (PHI), no residue was detected for imidacloprid and thiacloprid, while spinosad
showed a residue level of 0.04 mg/kg. The study of the effect of the technological process on pesticide transfer in olive oil showed
that these insecticides tend to remain in the olive cake. The LC/DAD/ESI/MS method showed good performance with adequate
recoveries ranging from 80 to 119% and good method limits of quantitation (LOQs) and of determination (LODs). No matrix effect
was detected
Determination of famoxadone, fenamidone, fenhexamid and iprodione residues in greenhouse tomatoes
No full textBACKGROUND: Greenhouse tomato production is intended exclusively for fresh consumption. Typical greenhouse conditions provide a conducive environment for the development of different fungi,principally lateblightandgreymould, that can destroy plants and fruits. For this reason, different fungicides with different sites of action are used in integrated pest management
strategies. Famoxadone, fenamidone, fenhexamid and iprodione are fungicides of difference classes with different actions that could be used to control tomato pests.
RESULTS: TheQuEChERS method showed good recoveries, and the analyticalmethod allowed good separation of the fungicides selected. Good results were obtained in terms of repeatability and intermediate precision, with a coefficient of variation of <9.8%. The limits of determination and quantification of themethodwere far below the maximum residual levels (MRLs) set by
the EU for these fungicides in tomatoes. The analysis of fungicide residues showed that cv. Shiren accounted for higher residuelevels than cv. Caramba. The dissipation curves were similar in the two cultivars, indicating that the decrease in pesticides was not related to the tomato type.
CONCLUSIONS: Care should be taken when using pesticides in greenhouse conditions, because degradation mainly affects fruit growth. The size of the tomato, in particular its surface/weight ratio, is very important for defining pesticide residues. All fungicides used showed residue levels below the MRLs at the preharvest interval
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