1,720,961 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Carbon Nanofibers as Potential Catalyst Support for Fuel Cell Cathodes: A Review
No full textPolymer electrolyte membrane fuel cells (PEMFCs) are a fast growing next-generation energy conversion technology, which hold promising interest for transportation and other applications. Nevertheless, successful commercialization of PEMFCs has been significantly retarded principally due to the high cost and poor durability of Pt/C catalysts used for anodic and cathodic reactions. Under typical fuel cell operating conditions, a traditional Pt/C catalyst is prone to degrade by various mechanisms, such as electrochemical carbon corrosion, which results in detrimental effects on the long-term performance. There have been tremendous efforts undertaken to develop durable carbon supports by introducing graphitic carbon components. In this context, carbon nanofiber supported catalysts have been investigated as highly durable supports for Pt and non-Pt nanoparticles in recent years. We anticipate it is timely to review the developments in this topic. This Review highlights the current progress on the graphitic nanofibers as a catalyst support in terms of morphology, electrocatalytic activity, various functionalization strategies, and so on, specifically focusing on the effect of nanofiber edge carbons and the advantages of surface reconstruction of nanofiber edge carbon into loops with regard to the stability of carbon support and fuel cell performance. We believe this Review stands as a guide for future researchers to figure out a rational design of oxygen reduction reaction catalysts, especially dealing with highly graphitized carbons.
M-N4 makrotsüklilised katalüsaatorid hapniku redutseerumis- ja eraldumisreaktsiooni elektrokatalüüsis
Get PDFVäitekirja elektrooniline versioon ei sisalda publikatsiooneBifunktsionaalsed katalüsaatormaterjalid on vajalikud koostisosad mitmesugustes elektrokeemilistes seadmetes, kus nad elektrokatalüüsivad hapniku redutseerimisreaktsiooni ja hapniku eraldumisreaktsiooni. Need reaktsioonid toimuvad mitmetes elektrokeemilistes energia muundamise ja salvestamise tehnoloogiates, näiteks kütuseelementides, metall-õhk akudes ja elektrolüüserites, mis võimaldavad üleminekut fossiilkütustel põhinevatelt energiasüsteemidelt. Doktoritöö eesmärk oli uurida siirdemetallidel põhinevate materjalide bifunktsionaalseid elektrokatalüütilisi omadusi hapniku redutseerimis- ja eraldumis-reaktsioonil. Katalüsaatormaterjalidena kasutati bimetalseid ftalotsüaniinidega dopeeritud süsiniknanotorusid ja teisi süsiniknanomaterjale ning ka polümeersetel võrgustikel põhinevaid siirdemetallidega dopeeritud materjale. Uuringute põhiline fookus oli hapniku redutseerimis- ja eraldumisreaktsiooni elektrokatalüütilist aktiivsust määravate tegurite väljaselgitamine, et leida materjalide struktuuri ja omaduste vahelisi seoseid ning arendada veelgi paremaid katalüsaatoreid. Neid materjale kasutati katoodkatalüsaatorina anioonvahetusmembraaniga kütuseelementides ja õhuelektroodina tsink-õhk akudes, kus need näitasid suurepärast jõudlust ja mõnedki neist ületasid kommertsiaalsete väärismetallkatalüsaatoritega saadud jõudluse. Doktoritöö raames tehtud laiahaardelised uuringud ulatusid uudsete katalüsaatormaterjalide sünteesist kuni nende elektrokeemiliste omaduste süvaanalüüsini, andes seega olulise panuse elektrokatalüüsi valdkonnale.Bifunctional oxygen electrocatalysts have emerged as pivotal components in a broad spectrum of electrochemical devices, playing a crucial role in facilitating the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). These reactions are crucial in various electrochemical energy conversion and storage technologies, including fuel cells, metal-air batteries and water electrolysers, thereby aiding in the transition away from reliance on fossil fuel-based energy systems. The aim of this doctoral thesis was to explore the electrocatalytic performance of a range of first-row transition metal-based materials for bifunctional oxygen electrocatalysis. These materials encompassed bimetal-doped carbon nanotubes, catalysts doped with metal phthalocyanines on various commercial carbon supports and polymer framework-derived carbon materials doped with transition metals. The specific focus of this investigation was to elucidate the influence of various factors on the ORR and OER activity. The key objective was to develop better electrocatalysts and to establish relationships between their structure and properties. These materials were employed as cathode catalysts in anion-exchange membrane fuel cells and as air electrodes in zinc-air batteries, demonstrating exceptional performance with several of them matching or even surpassing the performance of commercial noble metal-based catalysts. This comprehensive research spanning from the synthesis of novel catalyst materials to the thorough analysis of their electrochemical behaviour, strives to make a meaningful contribution to the dynamic field of electrocatalysis.https://www.ester.ee/record=b564545
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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