1,721,005 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
Exploring the nature of soil organic matter from humic substances isolation to SOMics of molecular assemblage
No full textIn this review, the evolution of Soil Organic Matter(SOM) research was traced back to outline the
main achievement of understanding SOM in relation to its ecological functioning, particularly of carbon
sequestration against climate change. The short-coming of soil humus theory, knowledge of SOM protection and
stabilization, framework of newly emerged Humeomics as well as the increasingly active study of molecular
organics in soils were analyzed and discussed, highlighting the importance of re-visiting SOM in term of structureproperty-functions for the main mission of modern soil science. There were limitations of soil forming conditions,
fraction separation procedure and single molecule identification for understanding the huge complex humus of
larger sized synthesized molecules. Thanks to the ever-active studies of soil(organic) carbon sequestration and
stabilization focusing on the association status of SOM with soil components, SOM has been increasingly
recognized as an assemblage of metabolites from life activities on or in soil, with different allocation or protected in
mineral/organic complex phases, which could be traced by biomarker molecules. Using such biomarker molecules
as a target(like primer in molecular microbiology), all the molecules of SOM could be digested and isolated for
qualitative or quantitative identification with GC/MS high resolution technologies. Such development has emerged a
new paradigm of molecular SOM study, finally as SOMics as a modern soil science frontier. The functioning of
SOM for stabilizing soil structure, enhancing reactivity and promoting biological resistance could be correlated to
the paradigm of abundance, composition, structure and functions rather than the content and recalcitrance of SOM.
This may deserve urgent studies to quantify and parameterize the defined paradigm based on the molecular
composition of SOM. Again, such theory and technology development could provide a tool to manage SOM in
term of carbon sequestration but revalorizing bioactivity in ecosystems, especially in agroecosystems. We believe
such studies could rather depict the nature of SOM and of soil in relation to its ecological services and functioning,
which will be the focus of soil science in serving the sustainable development of human society
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
Humeome dynamics of paddy soil after short term rice cultivation
No full textHumeomics is a sequential chemical fractionation that uses in the order organic solvent extraction, transesterification with boron trifluoride in methanol, methanolic alkaline hydrolysis, cleavage of ether and glycosidic bonds with HI, and final alkaline extraction, The Humeomic procedure was applied for the first time directly on paddy soil after two cultivation seasons (2014 & 2015) and revealed a series of unique soil organic matter (SOM) fractions with specific molecular composition. Organic Carbon (OC) analysis revealed a significantly larger amount of humic component was solubilised in humeomic fractions (3.7 times more OC in 2014 and 2.5 times more in 2015) than it was extracted by the traditional alkaline extraction method, increasing the knowledge on SOM. The organosoluble to hydrosoluble organic carbon ratio of the fractions revealed increased hydrophobic protection of rice paddy soils even under short term cultivation period
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