1,720,970 research outputs found
Growth study and characterization of In-Sb-Te compounds deposited onto different substrates by metal-organic chemical vapour deposition
No full textA systematic study of the deposition parameters for the metal–organic chemical vapour deposition growth of In–
Sb–Te (IST), of interest for phase change memory applications, was performed. Samples were grown on Si/SiO2
and patterned substrates in the (220÷350)°C temperature range and working pressure from 35 to 100×102 Pa,
which resulted in the formation of thin films (down to 30 nm) or IST crystals. The chemical composition of the
IST films was mainly dependent on the deposition temperature. We have demonstrated the possibility to obtain
a conformal and smooth morphology with improved surface roughness for films grown at 260 °C when the
substrate surface is treated with the TrisDimethylaMinoAntimony ([N(CH3)2]3Sb) precursor. The IST-based
chalcogenide films exhibited different crystalline and partially amorphous phases, which may be favourable
for multilevel data storage. The IST growth mechanism was analysed in terms of the structural, compositional
and electrical properties
Structural and electrical analysis of In–Sb–Te‐based PCM cells
No full textTwo In–Sb–Te compounds with low Te content (12 at.% and 17 at.%), deposited by metalorganic chemical vapour deposition, were implemented into prototype phase-change memory devices of size 50 × 50 nm2 and 93 × 93 nm2. These chalcogenides yielded devices with higher threshold voltage than those based on Ge–Sb–Te alloys. The endurance and programming window were markedly improved (from 103 to 106 cycles and from 1 to 2 orders of magnitude, respectively) when employing the Te-richer alloy. Moreover, in situ structural and electrical analysis on TiN/In–Sb–Te/dielectric stacks provided additional insight on the thermal stability of the two ternary phases In3SbTe2 and InSb0.8Te0.2, which were found to coexist in these compounds
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
Changes in the near edge x-ray absorption fine structure of hybrid organic-inorganic resists upon exposure
No full textWe report on the near edge x-ray absorption fine structure (NEXAFS) spectroscopy of hybrid
organic–inorganic resists. These materials are nonchemically amplified systems based on Si, Zr,
and Ti oxides, synthesized from organically modified precursors and transition metal alkoxides
by a sol–gel route and designed for ultraviolet, extreme ultraviolet (EUV) and electron beam
lithography. The experiments were conducted using a scanning transmission x-ray microscope
(STXM) which combines high spatial-resolution microscopy and NEXAFS spectroscopy. The
absorption spectra were collected in the proximity of the carbon edge (∼290 eV) before and after
in situ exposure, enabling the measurement of a significant photo-induced degradation of the
organic group (phenyl or methyl methacrylate, respectively), the degree of which depends on the
configuration of the ligand. Photo-induced degradation was more efficient in the resist
synthesized with pendant phenyl substituents than it was in the case of systems based on
bridging phenyl groups. The degradation of the methyl methacrylate group was relatively
efficient, with about half of the initial ligands dissociated upon exposure. Our data reveal that
such dissociation can produce different outcomes, depending on the structural configuration.
While all the organic groups were expected to detach and desorb from the resist in their entirety,
a sizeable amount of them remained and formed undesired byproducts such as alkene chains. In
the framework of the materials synthesis and engineering through specific building blocks, these
results provide a deeper insight into the photochemistry of resists, in particular for EUV
lithography
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
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