1,720,999 research outputs found
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
Citral-containing essential oils as potential tyrosinase inhibitors: A bio-guided fractionation approach
No full textExcessive melanin production causes serious dermatological conditions as well as minor aesthetic problems (i.e., freckles and solar lentigo). The downregulation of tyrosinase is a widespread approach for the treatment of such disorders, and plant extracts have often proven to be valuable sources of tyrosinase inhibitors. Citral (a mixture of neral and geranial) is an important fragrance ingredient that has shown anti-tyrosinase potential. It is highly concentrated in the essential oils (EOs) of Cymbopogon schoenanthus (L.) Spreng., Litsea cubeba (Lour.) Pers., Melissa officinalis L., and Verbena officinalis L. However, only L. cubeba EO has been investigated for use as a potential skin-whitening agent. This work evaluates the in vitro tyrosinase inhibitory activity of these EOs and studies, using bio-assay oriented fractionation, whether their differing chemical compositions influence the overall EO inhibitory activities via possible synergistic, additive, and/or competitive interactions between EOs components. The inhibitory activity of C. schoenanthus EO and that of M. officinalis EOs, with negligible (+)-citronellal amounts, were in-line with their citral content. On the other hand, L. cubeba and V. officinalis EOs inhibited tyrosinase to considerably greater extents as they contained beta-myrcene, which contributed to the overall EO activities. Similar observations were made for M. officinalis EO, which bears high (+)-citronellal content which increased citral activity
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
Growing sweet basil in a floating growing system enhances yields, reduces nitrate content, and modulates the aromatic profile
No full textPremium quality in culinary herbs includes high yield and year-round supply, a short supply chain for the fresh market, high safety and, ultimately, a good aroma. Floating growing systems can standardize fresh herb production, also thanks to an elevated efficiency in terms of Water and Nutrient Use. Ocimum basilicum L. 'Superbo' was grown using a Lab-Scale Pilot Plant in Floating Growing System (LSPP-FGS) from May 18 to June 6 (20 days). Four hydroponic nutrient solutions (HNS) with variable N levels and N:P:K ratios (N:P:K respectively of 6:2:6, 12:2:6, 6:4:12, 12:4:12) were used, under monitored conditions (air temperature, relative humidity, HNS pH and EC, water and HNS consumption). At harvest, biometric parameters were measured (fresh and dry weight, chlorophyll content, nitrate content) and several coefficients were calculated (dry matter - DM, water use efficiency - WUE, nitrogen use efficiency - NUE). Fertilization regimes did not affect the plant fresh biomass (3.65 kg m-2), DM (7.4%) and chlorophyll content (SPAD value of 27.6). While WUE was not significantly affected (48 g FW L-1 H2O), the NUE was higher with low N fertilization, and increased with N:P:K=6:4:12. Nitrate accumulation was higher with N:P:K = 12:2:6, although still low (ca 1453 mg kg-1 FW). The aromatic profile was assessed on dry material. Twenty-three compounds were detected as typical of the aromatic profile of basil, with 7 as marker compounds: bornyl acetate, β-farnesene, 1, 8-cineole, α-bergamotene, methyl eugenol, eugenol and linalool. Eugenol was ca 32% higher in N:P:K = 12:2:12 compared to other treatments, while linalool was ca 19% higher in N:P:K = 6:2:6. The experiment revealed that the FGS is a suitable system for growing sweet basil, ensuring elevated productivity and high WUE in a very short growing cycle. It also confirmed that fertilization has a significant influence on the aromatic profile, namely, to increase the eugenol and the linalool contents
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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