1,720,985 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
Scale mismatch confounds generality of the river continuum concept: bridging the gap through explicit resource modelling
No full textBibliography: p. 72-9
Effect of density, microhabitat and food on growth and survival of rainbow trout fry, oncorhynchus
No full textBibliography: p. 122-148.offsit
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
Effect of density, microhabitat and food on growth and survival of rainbow trout fry, oncorhynchus mykiss Richardson
No full textBibliography: p. 122-148
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
The Effects of biotic and abiotic factors on the foraging success of a lotic minnow, rhinichthys cataractae
No full textBibliography: p. 141-151
Ecological effects of a bleached kraft pulp mill effluent on benthic biota of the Athabasca River
No full textThe effects of nutrient enrichment and contaminant toxicity from a bleached kraft mill effluent (BKME) on the benthic biota of the Athabasca River were assessed using an integrated assessment approach. Components of the research included a stream mesocosm experiment, field observations, and chronic and behavioral laboratory bioassays using mayfly species from the receiving environment. Effluent and nutrient additions to stream mesocosms resulted in a 7-fold increase in periphyton biomass (Chl'a'), a doubling of insect abundance, approximately 30-100% increase in individual dry weight of some grazing insect taxa, and altered diatom and insect community composition. In all cases, responses to 1% BKME and an equivalent nutrient addition were remarkably similar, indicating that the primary effect of this discharge was nutrient enrichment. These findings were corroborated by observations in field samples from reference and exposed river reaches. Laboratory bioassays addressed the effect of exposure to BKME in water alone, or both water and food, on feeding behavior of the mayfly ' Ameletus subnotatus'. BKME in water had no effect on feeding, but exposure through both food and water resulted in 26-33% reduced consumption in BKME treatments. Contrary to expectations, when given a choice, mayflies preferentially fed on diatoms exposed to 1-7% BKME. Exposed diatom cultures contained more bacteria than control algae, and total lipid content of the diatoms ranged from 11.7% in the controls to 16.9% in 7% BKME. These observations, combined with results from feeding bioassays, indicated that exposure to effluent increased algal food quality. Chronic toxicity of the effluent was assessed for 'A. subnotatus ' and 'Baetis tricaudatus'. In both taxa, exposure to effluent in food and water increased size (total length) by 10-30%, supporting the conclusion that BKME exposure increased food quality of algae. First instar 'B. tricaudatus' were sensitive to BKME, with >= 50% mortality at concentrations above 1%, while mortality in older nymphs increased by at 7% BKME. Effluent-exposure had no effect on hatching success of 'B. tricaudatus. A subnotatus' exhibited increased mortality at 1%. Increased mortality with faster growth may indicate that these insects do not expend metabolic resources on defense. This research demonstrates a new approach for assessing the environmental effects of BKME release, and has resulted in new understanding of the impacts of this industry on the benthic community of this and perhaps other, northern rivers
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
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