1,720,966 research outputs found
Electrical properties of gold in dislocated silicon
No full textWe present results of the electrical properties of gold-decorated dislocations in silicon studied by means of Deep Level Transient Spectroscopy (DLTS). We investigated the effect of the gold by measuring DLTS spectra from Schottky diodes having different gold concentrations but same thermal history. We found three point-defect-like deep levels which occurrence could be attributed to the gold. After gold in-diffusion the well-known A-, B- and C-lines of dislocated n-type silicon could hardly be measured, whereas another gold-induced line appeared. This line has nearly the same emission characteristics as the gold acceptor level in non-dislocated silicon but shows a logarithmic dependence on capture time typical for extended defects. In the lower half of the band gap we measured at least two gold-induced levels. One of them shows very similar emission characteristics to the gold donor level in non-dislocated silicon. Both amplitudes are logarithmically dependent on the capture time. We tentatively attribute this behaviour to substitutional dissolved gold accumulated in the vicinity of the dislocations and in dislocation core
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Structural and electrical properties of metal impurities at dislocations in silicon
No full textThe electrical properties of silicon materials containing dislocations are strongly affected by deep levels at or close to the dislocation core. Such deep levels are frequently thought to be due to metal impurities that are chemically bound to the dislocation core, segregated in the long-range strain field or precipitated at the dislocation. This paper summarizes recent experimental studies of the interaction of metal impurities with dislocations in silicon. Transmission electron microscopy and deep level transient spectroscopy are the main techniques to study precipitation at dislocations and binding or segregation of metal impurity atoms, respectively. Focus is drawn to precipitation of fast diffusing 3d transition metals where dislocations not only serve as nucleation sites but also establish fast growth kinetics. In addition, gold impurities in the strain field of dislocations give rise to an acceptor level with the capture kinetics of extended localized defects while the emission characteristics are hardly distinguished from those of the acceptor level of gold atoms in the undisturbed bulk. The results will be discussed in terms of possible response of the deep impurity level and the silicon bands to the dislocation strain field. (c) 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
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