1,721,065 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
Synthesis and characterisation of CeRu₄Sn₆ and CeBiPd single crystals
Full text linkElektronisch hochkorrelierte Materialien zeigen eine Fülle interessanter Quanteneigenschaften.Dies ist besonders dann der Fall, wenn die starken elektronischen Korrelationen gepaart mit nichttrivialer Bandtopologie auftreten. Derartige Materialien zeigen überraschende Eigenschaften, die sie interessant für neuartige Quantenanwendungen machen. Eine Materialklasse, in der solche Eigenschaften beobachtet wurden, sind Schwere-Fermionensysteme. Ternäre intermetallische Verbindungen mit einem Element der Seltenen Erden und zwei Elementen der p- oder d-Reihe sind ein vielversprechender Ausgangspunkt. Für die Untersuchung dieser Materialienist es essenziell, über ein gut kontrollierbares Syntheseverfahren zu verfügen. Insbesondere die Herstellung von Einkristallen ist schwierig, aber dennoch notwendig, um eingehende Studiender Materialeigenschaften zu ermöglichen. CeRu 4 Sn 6 und CeBiPd sind zwei solche ternäre Verbindungen, bei denen der Kondoeffekt nachgewiesen werden konnte. Um das spärliche Wissen um ihre Eigenschaften erweitern zu können, wurden in dieser Arbeit umfangreiche Experimentreihen über ihre Syntheseverfahren aufgesetzt. Anschließend wurden diese durch Messungen einiger physikalischer Eigenschaften ergänzt.CeRu 4 Sn 6 -Einkristalle wurden bisher im Zonenschmelzverfahren hergestellt, um unter anderem ihre Ladungsträgerbeweglichkeit zu messen. Aufgrund der Vermutung, dass die Qualität dieser Kristalle durch das verwendete Verfahren durch Defekte limitiert ist, wurde in dieser Arbeit sowohl durch Erweiterung des Zonenschmelzverfahrens als auch durch das Flussmittelverfahren versucht, die Qualität der hergestellten Einkristalle zu verbessern. Allerdings konnte in den so produzierten Proben bisher keine signifikante Erhöhung der Ladungsträgerbeweglichkeit nachgewiesen werden. Dies lässt den Schluss zu, dass die niedrige Beweglichkeit eine intrinsische Materialeigenschaft ist. An CeBiPd-Einkristallen wurden zuvor schon Untersuchungen des elektrischen Widerstandes durchgeführt, allerdings schwankte der gemessene Widerstand stark von Probe zu Probe. Durch das Flussmittelverfahren wurde in dieser Arbeit versucht,die Zusammensetzung der hergestellten Proben genau zu kontrollieren, um herauszufinden, ob es einen messbaren Zusammenhang zwischen der Zusammensetzung und dem elektrischen Widerstand gibt. Einige interessante Zusammenhänge konnten aufgespürt werden. Um einen völlig reproduzierbaren Syntheseweg zu etablieren, sind aber weitere Untersuchungen nötig. Eine neue Entdeckung ist ein antiferromagnetischer Übergang bei niedrigen Temperaturen.Strongly correlated electron systems are a rich playground to discover new quantum phenomena. This is particularly true if combined with effects of nontrivial electronic topology. The resulting properties show promise for novel quantum applications. Very interesting in this respect are heavy fermion systems. A material setting with several candidate topological heavy fermion compounds are ternary intermetallics in which a rare earth element is combined with elements of the p or d series. The physical properties of a number of them have been inve-tigated, but many more remain to be explored. A well-developed and controllable synthesisprocess is a prerequirement for conducting systematic and detailed research on them. For advanced studies, single crystals are needed but their growth can be challenging. In this work the synthesis of the two intermetallic compounds CeRu 4 Sn 6 and CeBiPd was investigated. Inprevious studies they were found to exhibit the Kondo effect. On the other hand the role of nontrivial topology is mostly unexplored, thus calling for further investigations. Additionally to the many experiments that were conducted in this work to adjust the parameters of the single crystal growth, some physical properties were measured to explore the composition/structurevs. property relationship.For CeRu 4 Sn 6 the charge carrier mobility was studied in the past. There were indications that defects in the sample could have reduced the mobility. Therefore, in this work, high-qualityCeRu 4 Sn 6 single crystals were synthesised by the floating zone method and by flux growth.However, in all measured samples the charge carrier mobility did not increase significantly compared to previous results, which might suggest that the mobility in this material is intrinsicallylow. For CeBiPd previously reported resistivity measurements showed a large spread of results,which prompted the question whether the physical properties are highly influenced by the composition. In this work CeBiPd single crystals were synthesised using flux growth. A number of relationships between the stoichiometry of the material and the resulting properties could be revealed. However, to achieve a full control of the composition and thus the properties will require further investigations. The physical property measurements in this work showed that instead of a superconducting transition previously reported in polycrystalline CeBiPd samplesan antiferromagnetic transition takes place
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
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