1,721,869 research outputs found
Calibration correction of ultra low energy SIMS profiles based on MEIS analysis of shallow arsenic implants in silicon
No full textSecondary ion mass spectrometry (SIMS) and medium energy ion scattering (MEIS) have been applied to the characterization of ultra-shallow distributions of arsenic in silicon obtained by ion implantation. A previously developed quantitative model for the correction of results obtained by ultra low energy SIMS was tested on different types of samples. The model deals with the different sputtering regimes in SiO2 and Si and corrects the analysis behaviour at the SiO2/Si interface. Model results were compared with MEIS which yields depth profiles that are more accurate and can be quantified from first principles. The obtained model was tested on samples with or without a pre-amorphization implant step prior to As implantation and subsequently annealed at 550 °C in a partially oxidizing atmosphere. Results show excellent agreement on As peak position and shape; however, MEIS detects differences between profiles of preamorphised and non-preamorphised samples whereas SIMS profiles of these samples are almost identical. Copyright © 2012 John Wiley & Sons, Ltd
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
TiN/STO/TiN MIMcaps nanolayers on silicon characterized by SIMS and AFM
No full textHigh-k dielectrics as SrxTi1-xOy (STO) are of great interest for the development of dynamic random access memory (DRAM) devices. The characterization of these nanolayers is important. SIMS depth profiling through TiN and STO films is affected by strong artifacts in different ways. The erosion process causes surface topography modifications both in the TiN/STO/TiN layer system and in the silicon substrate. AFM analyses have been carried out on pristine TiN and STO film surfaces and at various crater depths. Very different roughness evolutions are identified for TiN or STO films, within the SIMS craters sputtered with 500 eV Cs+ while using eucentric stage rotation
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
sj-pdf-1-eso-10.1177_23969873211057421 – Supplemental Material for Patient and proxies’ attitudes towards deferred consent in randomised trials of acute treatment for stroke: A qualitative survey
No full textSupplemental Material, sj-pdf-1-eso-10.1177_23969873211057421 for Patient and proxies’ attitudes towards deferred consent in randomised trials of acute treatment for stroke: A qualitative survey by Noa van den Bos, Sophie A van den Berg, Catalina MM Caupain, Jeannette AJ Pols, Tessa van Middelaar, Vicky Chalos, Diederik WJ Dippel, Yvo BWEM Roos, Manon Kappelhof and Paul J Nederkoorn in European Stroke Journal</p
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
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