1,721,022 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
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
Satellite-based estimation of phytoplankton functional types in the Baltic Sea using a regionalized algorithm
No full textIn the last decades, remote sensing and diagnostic pigment (DP)-based methods have significantly advanced the estimation of phytoplankton functional types (PFTs). However, most existing models are optimized for open-ocean conditions and are not directly transferable to optically complex environments, such as the Baltic Sea. This basin presents unique bio-optical challenges that hinder accurate PFTs estimation using global algorithms. Although regional DP-based models have been developed for this region, they are primarily limited to the Southern Baltic, restricting their applicability to the entire basin. The objective of this study was to develop a regionalized empirical algorithm for estimating PFTs and phytoplankton size classes (PSCs) across the entire Baltic Sea by integrating in situ High Performance Liquid Chromatography (HPLC) pigment observations with satellite-derived chlorophyll-a concentration (Chl-a). The algorithm was trained using pigment data collected from multiple sub-basins and subsequently applied to Chl-a satellite observations to map the basin-wide spatial distribution of PSCs and key functional types, including cryptophytes, green algae, and dinoflagellates. The results shown that nanoplankton were the dominant size class across the basin, accounting for up to 46% of Chl-a, particularly in coastal waters. Picoplankton dominated offshore regions, contributing up to 21% of Chl-a, while microplankton reached peak proportions (∼37.5%) in nearshore areas of the Gulf of Finland. Among functional groups, cryptophytes and dinoflagellates exhibited strong coastal and northern basin dominance, whereas green algae and prochlorophytes were more prevalent offshore. By coupling regional HPLC-based empirical relationships with satellite data, this study provides a spatially explicit and internally consistent assessment of PFTs distributions across the Baltic Sea, offering a valuable tool for ecosystem monitoring.JRC.D.2 - Ocean and Wate
UHPLC-based C-phycocyanin quantification method to support the validation of remote sensing models for harmful cyanobacterial blooms
No full textThe deployment of hyperspectral satellite missions has opened new opportunities for integrated approaches to address the escalating issue of cyanobacterial algal blooms in marine and inland waters. Despite these advancements, the validation of satellite data concerning C-phycocyanin (C-PC) content requires robust analytical methods. Currently, the available techniques, predominantly spectrophotometric or fluorometric, exhibit low reproducibility due to the interference of chlorophyll a and perform optimally with water samples. The samples collected during ship-based campaigns and commonly used for satellite data validation are concentrated samples on filters, which limiting the application of these methods. In this study, we aim to establish an Ultra High Pressure Liquid Chromatography (UHPLC) -based method for C-PC quantification in water samples concentrated on filters to validate satellite derived algorithm for monitoring cyanobacteria blooms. This involves the extraction of C-PC from pure algal cultures (Synechococcus spp. and Anabaena spp.) and natural samples fixed on filters and the quantification employing UHPLC analysis—a recognized gold standard for phytoplankton pigment analysis. Based on a Design of Experiment (DoE) full factorial design approach, we compared different extraction techniques. Subsequently, we compared different methods and developed and validated a rapid, simple, and sensitive reverse phase UHPLC method. The optimized chromatographic parameters for C5 phase, were acetonitrile with trifluoroacetic acid (0.1 % v/v) in a 5′ linear gradient (from 20 % to 100 %), flowrate 0.8 mL min−1, with an accuracy of 10 %, a reproducibility of 9.8 % and a limit detection of 0.025 mg L−1.JRC.D.2 - Ocean and Wate
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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