1,720,961 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
Computational modelling and design of bioinspired silica materials
No full textThe use of bio-inspired methods for production of mesoporous silicas could lead to significant improvements in the synthetic conditions at which these materials are traditionally produced, removing the need for strong pH as well as high temperatures and pressures, and opening the way for milder treatments for template removal. However, due to the complexity of these systems, with many processes occurring simultaneously and high dependence on the specific synthetic conditions,obtaining a detailed description of their mechanism of formation based only on experimental methods is often very difficult. To overcome this difficulty, simulations methods, particularly molecular dynamics, have been developed and used to shed some light into this complex but fascinating problem.In the present thesis, the processes underlying the synthesis of bio-inspired silica materials are investigated at computational level by means of a multi-scale approach.This methodology has two major advantages: it enables to explore longer time and length scales, beyond the current limit of atomistic simulations, while allowing to maintain realism at the lower resolution levels, which are calibrated to match properties obtained at higher levels of theory.The work can be divided into two main parts. The first part aims to provide more insight into the synthesis of two early examples of bio-inspired materials(HMS and MSU-V), by means of a combination of atomistic and coarse-grained simulations. HMS and MSU-V materials share some common characteristics: they are both synthesised using amine surfactants as templates and a neutral templating route has been proposed to explain their formation. By simulating their synthesis at different pH values, it was possible to show that charged species are necessary to promote mesophase formation (disordered packing of rod-like micelles for HMS materials and lamellar structures for HMS). In both systems, in fact, neutral species produced phase separation of the templating materials into an unstructured and non-porous phase, and the lack of interactions with silicates indicates that these conditions cannot lead to structural organisation. Hence, molecular dynamics simulations reveal that, similarly to other mesoporous silicas and contrary to what has been previously hypothesised, charge matching interactions rather than hydrogen bonds are responsible for the self-assemble this class of materials. This knowledge is fundamental to provide further control over the properties of these solids and target their design for specific applications.In the second part, atomistic simulations are used to help elucidate the mechanism of template removal from a bio-inspired silica material by solvent extraction.This revealed that mild post-synthetic acid treatments allow to remove the templating additive by reducing, and eventually switching off, its interaction with the silica material. In agreement with experimental findings, which show that the majority of the additive is removed between pH 5 and 4, simulations indicate that at pH below 4.2 thermal fluctuations are sufficient to cause widespread release of the template. This result suggests that molecular simulations can be used as a simple and inexpensive tool for choosing appropriate solvents and experimental conditions in the material purification processes.The use of bio-inspired methods for production of mesoporous silicas could lead to significant improvements in the synthetic conditions at which these materials are traditionally produced, removing the need for strong pH as well as high temperatures and pressures, and opening the way for milder treatments for template removal. However, due to the complexity of these systems, with many processes occurring simultaneously and high dependence on the specific synthetic conditions,obtaining a detailed description of their mechanism of formation based only on experimental methods is often very difficult. To overcome this difficulty, simulations methods, particularly molecular dynamics, have been developed and used to shed some light into this complex but fascinating problem.In the present thesis, the processes underlying the synthesis of bio-inspired silica materials are investigated at computational level by means of a multi-scale approach.This methodology has two major advantages: it enables to explore longer time and length scales, beyond the current limit of atomistic simulations, while allowing to maintain realism at the lower resolution levels, which are calibrated to match properties obtained at higher levels of theory.The work can be divided into two main parts. The first part aims to provide more insight into the synthesis of two early examples of bio-inspired materials(HMS and MSU-V), by means of a combination of atomistic and coarse-grained simulations. HMS and MSU-V materials share some common characteristics: they are both synthesised using amine surfactants as templates and a neutral templating route has been proposed to explain their formation. By simulating their synthesis at different pH values, it was possible to show that charged species are necessary to promote mesophase formation (disordered packing of rod-like micelles for HMS materials and lamellar structures for HMS). In both systems, in fact, neutral species produced phase separation of the templating materials into an unstructured and non-porous phase, and the lack of interactions with silicates indicates that these conditions cannot lead to structural organisation. Hence, molecular dynamics simulations reveal that, similarly to other mesoporous silicas and contrary to what has been previously hypothesised, charge matching interactions rather than hydrogen bonds are responsible for the self-assemble this class of materials. This knowledge is fundamental to provide further control over the properties of these solids and target their design for specific applications.In the second part, atomistic simulations are used to help elucidate the mechanism of template removal from a bio-inspired silica material by solvent extraction.This revealed that mild post-synthetic acid treatments allow to remove the templating additive by reducing, and eventually switching off, its interaction with the silica material. In agreement with experimental findings, which show that the majority of the additive is removed between pH 5 and 4, simulations indicate that at pH below 4.2 thermal fluctuations are sufficient to cause widespread release of the template. This result suggests that molecular simulations can be used as a simple and inexpensive tool for choosing appropriate solvents and experimental conditions in the material purification processes
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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