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
A Novel Technique to Manufacture Carbon-free Gas Diffusion Layer for Polymer Electrolyte Membrane Fuel Cell Application by a Selective Laser Sintering (3D Printing)
No full textA Gas Diffusion Layer (GDL) is an integral component of a PEM fuel cell stack, which plays a significant role in determining its performance, durability and the dynamic characteristics. An ideal GDL function to simultaneously transport three of the five essential elements, namely gas, water and heat involved in the electrochemical reaction. In addition, it also transports the electron produced in the electrochemical reaction and serves as an armour to safeguard the membrane (Nafion), which is a delicate and most expensive component of the PEM fuel cell stack. However, the conventional carbon-based GDL materials suffer from degradation issues during PEM fuel cell operation, and the predominant one is the electrochemical voltage oxidation.
The electrochemical degradation is due to the oxidation of the carbon present in the carbon paper to carbon dioxide especially at voltages greater than 0.207 V on a standard hydrogen electrode (SHE). Operating a PEM fuel cell stack at a low voltage (<0.207 V) is not practically possible since it can severely aggravate the operating efficiency and power density of the PEM fuel cell stack. Incorporating a GDL that is free from carbon can be a promising solution to circumvent these issues about the electrochemical oxidation. Also, the conventional GDL manufacturing technique had a tedious and complicated process, which involves multiple stages. These multiple production stages also led to its high manufacturing costs and increased lead-time.
The proposed research work is estimated to address both these issues of GDL durability and manufacturing costs. The additive manufacturing method incorporating selective laser sintering (SLS) technique aims to provide a comprehensive solution to address both these issues. The concept of SLS is that the laser beam robotically scans the composite powder (base and conductive powder) at points in a space defined by a 3D model, fusing and subsequently binding the composite material together to create a solid-state structure.
Thus, SLS can be a favourable route to fabricate a carbon-free GDL as well as to reduce its manufacturing costs and lead-time. At the end of the experimental investigation, holistic characterisation studies were performed to have a general insight on the characteristics of the proposed material. Valuable information is extrapolated from the characterisation studies, which can assist, to fine-tune the material selection and SLS process parameter. In addition, ground-breaking findings from the perspective of the structural and functional relationship of the proposed GDL specimen had been made considering the first principles of the diverse field of engineering. Though the performance based on the experimental results are inferior, it gives us the buoyancy that the proposed proof of concept can be a promising route to fabricate durable and cost-effective gas diffusion layers based on the critical observations of the SLS process
A Novel Technique to Manufacture Carbon-free Gas Diffusion Layer for Polymer Electrolyte Membrane Fuel Cell Application by a Selective Laser Sintering (3D Printing)
No full textA Gas Diffusion Layer (GDL) is an integral component of a PEM fuel cell stack, which plays a significant role in determining its performance, durability and the dynamic characteristics. An ideal GDL function to simultaneously transport three of the five essential elements, namely gas, water and heat involved in the electrochemical reaction. In addition, it also transports the electron produced in the electrochemical reaction and serves as an armour to safeguard the membrane (Nafion), which is a delicate and most expensive component of the PEM fuel cell stack. However, the conventional carbon-based GDL materials suffer from degradation issues during PEM fuel cell operation, and the predominant one is the electrochemical voltage oxidation.
The electrochemical degradation is due to the oxidation of the carbon present in the carbon paper to carbon dioxide especially at voltages greater than 0.207 V on a standard hydrogen electrode (SHE). Operating a PEM fuel cell stack at a low voltage (<0.207 V) is not practically possible since it can severely aggravate the operating efficiency and power density of the PEM fuel cell stack. Incorporating a GDL that is free from carbon can be a promising solution to circumvent these issues about the electrochemical oxidation. Also, the conventional GDL manufacturing technique had a tedious and complicated process, which involves multiple stages. These multiple production stages also led to its high manufacturing costs and increased lead-time.
The proposed research work is estimated to address both these issues of GDL durability and manufacturing costs. The additive manufacturing method incorporating selective laser sintering (SLS) technique aims to provide a comprehensive solution to address both these issues. The concept of SLS is that the laser beam robotically scans the composite powder (base and conductive powder) at points in a space defined by a 3D model, fusing and subsequently binding the composite material together to create a solid-state structure.
Thus, SLS can be a favourable route to fabricate a carbon-free GDL as well as to reduce its manufacturing costs and lead-time. At the end of the experimental investigation, holistic characterisation studies were performed to have a general insight on the characteristics of the proposed material. Valuable information is extrapolated from the characterisation studies, which can assist, to fine-tune the material selection and SLS process parameter. In addition, ground-breaking findings from the perspective of the structural and functional relationship of the proposed GDL specimen had been made considering the first principles of the diverse field of engineering. Though the performance based on the experimental results are inferior, it gives us the buoyancy that the proposed proof of concept can be a promising route to fabricate durable and cost-effective gas diffusion layers based on the critical observations of the SLS process
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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