1,721,052 research outputs found
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
Hafnium oxide-based dielectrics by atomic layer deposition
No full textIn 2007 there was an important change in the architecture of nanotransistors - the building
blocks of modern logic and memory devices. This change was from utilising thermally
grown silicon dioxide as a dielectric to so-called high-_ hafnium oxide dielectrics
grown by atomic layer deposition. The _rst production logic devices of this era used a
hafnium oxide dielectric layer deposited by thermal atomic layer deposition; using HfCl4
and H2O as the precursors. Present day fabrication makes use of hafnium oxide-based
atomic-layer-deposited dielectric _lms. The latest nanotransistor devices utilise a third
generation hafnium oxide-based dielectric material.
This thesis examines hafnium oxide-based thin _lm dielectric materials prepared by
thermal atomic layer deposition on silicon substrates. Speci_cally the enhancement of
the dielectric response of hafnium oxide by the addition of other elements is examined.
Two ternary materials systems were deposited by thermal atomic layer deposition and
analysed: titanium-hafnium oxide and cerium-hafnium oxide. Hafnium oxide _lms were
deposited to be used as measurement benchmarks. Cerium oxide _lms were also deposited
and analysed in their own right as potential dielectric layers.
The hafnium oxide and both ternary deposition experiments used (MeCp)2Hf(OMe)(Me)
as the hafnium precursor. The titanium-hafnium oxide growth used Ti(iOPr)4 as a titanium
source and the cerium oxide and cerium-hafnium oxide work utilised Ce(mmp)4
as a cerium source. Post-deposition specimen sets consisted of an as-deposited sample,
a sample spike-annealed in N2 at 850 _C and a sample annealed for 30 minutes at 500
_C. These annealing regimes were performed to mimic typical gate-_rst and gate-last
transistor processing steps. The compositions and thicknesses of the _lms were measured
using medium energy ion scattering. The structure of the _lms was analysed by
X-ray di_raction and Raman spectroscopy. Capacitance-voltage and current density-
_eld measurements were taken from fabricated MOS capacitor specimens to assess the
dielectric response of the _lms.
X-ray di_raction and Raman measurements showed that un-doped HfO2 had monoclinic
crystallinity as-deposited and after the two annealing regimes. The dielectric constant
and leakage current density, 17 and 1.7_1
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
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
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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