1,721,387 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
A 2-YEAR STUDY OF ENTERIC INFECTIONS ASSOCIATED WITH DIARRHEAL DISEASES IN CHILDREN IN URBAN SOMALIA
No full textA hospital-based systematic sample of 1667 children with severe diarrhoeal disease was studied in Mogadishu, Somalia, throughout 1983 and 1984. One or more enteric pathogens were found in 61% of the patients. Rotavirus (25%), enterotoxigenic Escherichia coli (11%), Shigella spp. (9%), Aeromonas hydrophila (9%), Giardia lamblia trophozoites (8%), Campylobacter jejuni (8%), and Vibrio cholerae non-O1 (6%) were the most frequently identified pathogens. Age-specific detection rates of enteric pathogens and helminths, seasonal patterns, and relationship of some specific infections with feeding status and main clinical features have been defined for all the sample examine
On the alkaloids of two African Strychnos, Strychnos nigritana Bak and Strychnos barteri Sol. Carbon-13 NMR spectroscopy of nigritanins
No full textProteomic exploration of soft and hard biocorona onto PEGylated multiwalled carbon nanotubes
No full textIn nanomedicine, carbon nanotubes (CNTs) are considered potential candidates as drug delivery systems. The absorption of proteins onto CNTs, after their administration in physiological environment, forms the protein corona or biocorona, which is able to influence their biological properties and biocompatibility. For this reason, characterization of protein corona is a crucial aspect in the research to control CNTs toxicity and capability to target cells. Multiwalled carbon nanotubes (MWCNTs) were functionalized with polyethylene glycol (PEG), chosen considering its well-known biocompatibility, and then incubated in human plasma to create the biocorona. Plasma proteins, which bound around PEGylated CNTs, were detached using five different solutions, grouped into native and denaturant buffers, and used to characterize the two components of biocorona. The proteomic fingerprinting of biocorona was performed by SDS-PAGE and 2D-PAGE separation and mass spectrometry analysis. Native eluents were able to capture proteins of soft corona, characterized by complex secondary structures, and formed by both β-sheet and α-helices domains. Denaturant buffers have eluted many proteins with a high percentage of the α-helix structure that could be involved in specific interactions responsible for the formation of hard corona
Packaging and technologies for food products: a state-of-the art survey
No full textThis paper proposes an in-depth analysis of the packaging materials and technologies used for commercial food and beverage products, and as such, it builds upon a previous publication by Bottani et al.(2011).The original study evaluated a sample of 175 food and beverage products, for which, through an in-field investigation of Italian retailers, the relevant characteristics of the packaging and product were retrieved.In this study, a larger sample of products is analyzed, consisting of 212 food products, and the product/packaging characteristics are updated in case changes occurred in the packaging material or processing technologies of foods.Moreover, compared to the previous research, end-of-life considerations of the packaging material are added.Statistical analyses are then made on the sample of products, to determine possible relationships between the product characteristics, the processing technology, the packaging type and the end-of-life.By delving into the relationships between product attributes and packaging technologies, results of this research contribute valuable insights to the food packaging industry, offering an up-to-date perspective, as well as suggestions for food manufacturers to identify the most suitable packaging technology for new food products
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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