1,721,068 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
Benchmarking dei Processi di Sviluppo Prodotto
No full textLo sviluppo continuo di nuovi prodotti è un fattore di primaria importanza per competere in mercati sempre più caratterizzati da consumatori esigenti, da brevi cicli di vita dei prodotti e da ridotti tempi di risposta. In questo contesto, il processo di Sviluppo Nuovo Prodotto (Snp) assume un ruolo rilevante per la competitività aziendale, dal momento che accelerare i tempi di sviluppo e ridurre il Time To Market (Ttm), introducendo nuovi prodotti sul mercato prima dei competitor, permette di sfruttare i vantaggi del first mover, aumentando i guadagni e recuperando rapidamente gli investimenti.
L’efficientamento del processo di Snp è reso difficile dalla complessità e variabilità del processo stesso, tipicamente composto da numerose attività disperse lungo diverse funzioni, caratterizzato nelle sue prime fasi da una componente ad alto contenuto creativo difficilmente controllabile
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
Mercapturic acids as biomarkers for profiling human exposure to environmental and occupational pollutants
Full text linkBackground: Mercapturic acids (MA) are final urinary metabolic products of some environmental and occupational toxicants, formed by the conjugation of glutathione and electrophilic compounds. These electrophilic compounds are believed to be active species able to react with DNA and responsible for the genotoxicity associated with parent compounds. The aim of this work was the development and validation of an analytical assay for the determination of several urinary mercapturic acids to be used as biomarkers for profiling human exposure. Method: An isotope dilution tandem mass spectrometry method, coupled with reversed-phase liquid chromatography, was developed for the analysis of eighteen urinary MA from acrolein (3-HPMA), acrylamide (AAMA, GAMA), acrylonitrile (CEMA, HEMA), benzene (SPMA), 1,3-butadiene (DHBMA, MHBMA), crotonaldehyde (CMEMA, HMPMA), 4-chloronitrobenzene (NANPC), N,N-dimethylformamide (AMCC), ethylene oxide (HEMA), propylene oxide (2-HPMA), styrene (PHEMA1 e 2), toluene (SBMA), methylating (MMA) and ethylating agents (EMA). Samples were prepared by simple filtration after dilution. Calibration curves, sensitivity, accuracy, precision, selectivity, process efficiency, and stability were evaluated for method validation. Moreover an external validation was performed. The assay was applied to the analysis of 46 end of shift urine samples from non-smoker workers of 6 different workplaces: refinery workers, coke oven workers, traffic policemen, rotogravure printing workers, gasoline station attendants, asphalt workers, and workers not occupationally exposed to chemicals. Result: Limits of quantitation ranged from 0.01 to 3.2 μg/L, precision assays yielded optimal values for all compounds, with all RSDs < 10%, and accuracy values ranging from 93.4% to 114.9% of theoretical value. The use of deuterated internal standards was suitable to control for matrix effect. The assay allowed the simultaneous quantitation of urinary mercapturic acids at different ranges of concentration. The external validation exercise was positive for all compounds. The application of the assay to urine samples of workers highlighted differences in mercapturic acid profiles among groups for: CEMA, DHBMA, MHBMA, PHEMA and SPMA, in agreement with the expected patterns of exposure. Conclusion: This high-throughput method is a valid and useful tool for the determination of urinary mercapturic acids, suitable for human biomonitoring of occupational and environmental exposure
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
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