1,720,984 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
Deep traps related effects in GaN MESFETs grown on sapphire substrate
No full textThe wide bandgap semiconductor gallium nitride (GaN) and related materials are highly attractive for high-power and
high-temperature applications [1]. However, instabilities related to material and trapping effects limited the reproducibility
and the performance of these devices. A decrease of the drain current, ID, during operation and after repeated measurements
has been observed by several authors [2,3], and generically identified as “current collapse”.
In this work we have investigated the mechanisms that lead to ID decrease in GaN MESFETs grown by MOCVD on a
(0001) sapphire substrate, see Fig. 1, in the attempt to identifying the deep traps involved
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
Analysis of hot carrier aging degradation in GaN MESFETs
No full textIn this paper the study of the effects of illumination on the drain current of GaN
MESFETs are presented with the aim of discriminating effects due to traps on the
device surface from those related with epitaxial material substrate and its
interfaces. Illumination together with on-state stress are also used to investigate
hot carrier degradation phenomena which consist in drain access resistance
increase and consequently in drain current decrease: this can be attributed to the
generation of deep levels and/or to increased trapped charge after hot-carrier test
on the device surface access regions between the gate and the drain contacts. The
degradation level is remarkably higher in unpassivated devices with respect to
passivated ones. Hot carrier degradation can be recovered by thermal or R.T.
storage without bias
Hot carrier aging degradation phenomena in GaN based MESFETs
No full textIn this paper hot carrier degradation study in unpassivated and passivated GaN MESFETs will be presented: the observed drain current decrease will be proven to be consequent of a drain access resistance increase. In order to discriminate the effects due to traps on the device surface from those related with epitaxial material substrate and its interfaces, the influence of illumination on the drain current has been investigated by means of DC and gate-lag pulsed characterization. The measurements under light and under dark conditions lead us to suppose that the drain access resistance increase can be attributed to the generation of deep levels and/or to increased trapped charge after hot-carrier test on the device surface in the access regions between the gate and the drain contacts. The amount of degradation has been found to be remarkably higher in unpassivated devices with respect to passivated ones. Hot carrier degradation has been observed to be recovered by thermal or room temperature storage without applied bias
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
- …
