1,721,123 research outputs found
Atmospheric Pressure PE-CVD of Fluorocarbon Thin Films by Means of Glow Dielectric Barrier Discharges
No full textGlow dielectric barrier discharges (GDBDs) fed with He-C3F6 and He-C3F8-H2 gas mixtures were
used to deposit fluorocarbon thin films. The deposition process was studied inside the GDBD
existence domain as evaluated by electrical measurements. The composition and structure of
the deposited coatings were investigated through Fourier Transform Infrared Spectroscopy,
X-ray Photoelectron Spectroscopy, Water Contact Angle measurements, and Scanning Electron
Microscopy. He-C3F6 gas mixtures generate fluorocarbon
films with F/C ratio of 1.5 at deposition rates up to
34 nm min1, while with He-C3F8-H2 fed GDBDs it
is possible to tune the F/C ratio of the coating from
1.5 to 0.6 and to change its cross-linking degree by
varying the hydrogen concentration in the gas feed. H2
addition promotes the increase of the deposition rate
which is maximumfor fluorocarbon-to-hydrogen ratio
close to 1. Results of optical emission spectroscopy
investigation of the plasma phase are also presented
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
Fluorination of polymers by means of He-CF4 fed atmospheric pressure glow dielectric barrier discharges
Full text linkHe/CF4-fed GDBDs were used to fluorinate PP and PET. The effect of various process parameters
on the polymers surface composition and morphology, as well as on their wettability was
investigated inside the GDBD existence domain. An extensive surface fluorination of treated
polymers due to the grafting of F atoms and CFx
radicals was observed. The increase of CF4 concentration
in the feed, of treatment duration,
and of excitation frequency resulted in an
increase of the fluorination degree corresponding
to F/C ratios as high as 1.18 and 1.22 for PP
and PET, respectively. The emission spectra of
GDBDs fed by helium in mixture with CF4,
CHF3, C2F6 and C3F8 were compared
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
Deposition of Hydrocarbon Films by Means of Helium-Ethylene Fed Glow Dielectric Barrier Discharges
Full text linkThe present work provides a detailed study of
helium-ethylene dielectric barrier glow discharges. The effect of ethylene concentration, total gas flow rate, excitation frequency and applied voltage have been investigated in order to clarify both discharge operational mode, and coating composition. The discharge has been characterized by means of electrical measurements and optical emission spectroscopy, while the stable species contained in the gas effluent have been sampled and analyzed using gas chromatography with mass spectrometry detection to achieve indications on the reactive fragments generated inside the discharge. It has been observed that polyethylene-like coatings can be obtained for a wide range of electrical conditions, and the deposition rates have been found to range between 20 and 80 nm.min-1
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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