1,721,284 research outputs found
Monte Carlo modeling in the low-energy domain of the secondary electron emission of polymethylmethacrylate for critical-dimension scanning electron microscopy
No full textThe main scattering mechanisms governing the transport of
electrons in PMMA in an energy domain ranging from the energy of the
primary electron beam down to few hundreds of meV are identified. A
quantitative Monte Carlo model for the emission of secondary electrons
is developed to be applied for critical dimensions extraction from highresolution
scanning electron microscopy SEM images. Selected results
are presented, which demonstrate the accuracy of the proposed
approach. © 2010 Society of Photo-Optical Instrumentation Engineers
A novel thermomechanics-based lifetime prediction model for cycle fatigue failure mechanisms in power semiconductors
No full textIn this paper, we propose different procedures to extract the statistical distribution of the thermal cycles suffered by power devices submitted to arbitrary mission profiles and we discuss the different lifetimes predicted by them under the assumption of linear accumulation of the damage produced by low cycling fatigue. Furthermore, we introduce a novel prediction procedure, which is based on some fundamental equations, which take into consideration the creep experienced by compliant materials when they are submitted to thermal cycles
Lifetime extrapolation for IGBT modules under realistic operation conditions
No full textIn this paper a systematic approach is presented for extrapolating the lifetime due to bond wire lift-off in IGBT modules submitted to cyclic loading. Application profiles of the device are considered, as they are usually encountered in real current converters for railway traction systems. The proposed lifetime prediction scheme is based on the principle of the linear accumulation of the fatigue damage and takes into account the redundancy of the bond wires
On the Use of Neural Networks to Solve the Reverse Modelling Problem for the Quantification of Dopant Profiles Extracted by Scanning Probe Microscopy Techniques
No full textLifetime prediction and design of reliability tests for high power devices in automotive applications
No full text
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
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