1,720,967 research outputs found
Study of the modification of the microstructure of GaN after high – dose Si implantation
No full textRare earth oxides are among the materials which are presently studied as possible replacements of amorphous silicon dioxide as gate insulators in nanometric Si devices; in fact, they generally exhibit high values of the dielectric constant (“high-k”), a necessary requirement to obtain a high capacitance with layer thickness greater than the value below which tunnelling currents become unacceptably high. Lu2O3 is one of the rare earth oxides which may have the required properties in view of its quite high values of  and forbidden band gap.
Since the envisaged dielectric layers are only a few nm thick a description and a physical understanding of the atomic and electronic structure of the interface are of great importance. In this paper, we report a study by synchrotron radiation photoemission and transmission electron microscopy of the growth of Lu2O3 on Si(001). We provide evidence of a rather complex structure in which all silicon suboxides and SiO2 are present at the same time, along with a silicate – like phase and Lu2O3 itself; moreover, both crystalline and amorphous portions are present. The valence band discontinuity is found to be 3.16 ± 0.16 eV. These findings are discussed in the context of available theoretical predictions of thermodynamic stability versus the formation of silicon oxide, silicates and silicides and of the band discontinuity problem
X-ray absorption fine structure study of In implanted GaN: Effect of annealing
No full textGaN implanted with 700 keV In ions with fluence 5×1015 cm−2 is studied using X-ray absorption fine
structure (XAFS) spectroscopies at the N and Ga K edges. Rutherford backscattering (RBS) reveals that
implantation renders the top 200nm of the GaN film amorphous while the underlying 250nm of the film
are highly defective. The increase of the static disorder due to the implantation induced lattice damage is
evident both in the N K edge NEXAFS and the Ga K edge EXAFS spectra. Indium implantation also induces
the formation of N2 evinced by the evolution of a sharp resonance line (RL) that corresponds to 1s→*
transitions of molecular nitrogen. TheN2 molecules dissociate after annealing at temperatures higher than
800 ◦C. The bonding environment of Ga is also affected by the implantation and annealing: a marginal
increase of the Ga–Ga distance is observed due to the incorporation of In atomsand/or formation of defects.
The coordination number of the second nearest neighboring (NN) shell is reduced by more than 50% after
the implantation but recovers after annealing at 800 ◦C. Further increase of the annealing temperature
causes nitrogen loss as it is deduced by the reduction of the coordination number in the first NN shell by
about 20%
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
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