1,722,255 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
In situ study on the effects of Ni and Mo on the passive film formed on Fe-20Cr alloys by photoelectrochemical and Mott-Schottky techniques
No full textEffects of alloying elements (Ni and Mo) on the structure of passive film formed on Fe-20Cr alloys in pH 8.5 buffer solution were explored by analyzing the in situ electronic properties measured using the photoelectrochemical technique and Mott-Schottky analysis. The passive film formed on Fe-20Cr-10Ni was found to be mainly composed of Cr-substituted gamma-Fe2O3 from similarities in photocurrent response for the passive films formed on the alloy and Fe-20Cr. On the other hand, the photocurrent spectra for the passive films of Fe-20Cr-15Ni-(0,4)Mo alloys exhibited the spectral components associated with NiO and Mo oxide (MoO2 and/or MoO3) in addition to that induced by Cr-substituted gamma-Fe2O3. Mott-Schottky plots for the passive films formed on Fe-20Cr-(10,15)Ni and Fe-20Cr-15Ni-4Mo confirmed that the passive films on Fe-20Cr-(10,15)Ni-(0,4)Mo alloys have a base structure of Cr-substituted gamma-Fe2O3 with variation of densities of shallow and deep donors depending on the Ni and Mo contents in the alloys. We suggest that the passive film formed on Fe-20Cr-(10,15)Ni and Fe-20Cr-15Ni-4Mo alloys are composed of (Cr, Ni, Mo)-substituted gamma-Fe2O3 when the concentrations of Ni and Mo are below critical values. However, NiO and Mo oxide (MoO2 and/or MoO3) would be precipitated in the passive films when the concentrations of Ni and Mo exceed critical values. (c) 2006 Elsevier B.V. All rights reserved.The authors gratefully acknowledge the financial support
from Korea Science and Engineering Foundation
(KOSEF), grant No. R01-2000-000-00239-0. This study is
also partially supported by Brain Korea 21 (BK21) project
Effect of phase, frequency, magnitude and posture on discomfort associated with differential vertical vibration at the seat and feet
No full textThe interaction between the frequency of vibration and the relative phase between vibration at the seat and the feet on the discomfort of seated subjects exposed to vertical vibration has been investigated in an experimental study. Twelve seated subjects were exposed to sinusoidal vibration at five frequencies (2·5, 3·15, 4, 5 and 6·3 Hz) by means of two vibrators, one under the seat and the other under the footrest. A total of 100 combinations of vibration stimuli with two phases (0 and 180°) between the seat and the footrest at five acceleration levels (0·25, 0·4, 0·63, 1·0 and 1·6 m/s2 r.m.s.) and the five frequencies were presented to subjects in two postures (with and without thigh contact with the seat). The subjects judged that the differential vibrations with greater phase difference caused greater discomfort at frequencies up to 4 Hz. The subjects were most sensitive to phase changes at the lowest frequency and the lowest magnitude of vibration. In the equation, ψ = kφn, between the discomfort, ψ, and the magnitude of vibration, φ, the exponent n had a maximum of 1·34 "with thigh contact" and 1·24 "without thigh contact" for the in-phase vibration at around 4 Hz. The exponent had a minimum of 0·63 "without thigh contact" for the out-of-phase motion at 2·5 Hz. The results indicate that vibration discomfort is influenced by the phase between the seat and the feet, but that the effect depends on the frequency and magnitude of vibration and the posture of the body. The phase effect seems to be particularly important with low magnitudes of vibration at low frequencies
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
Effects of pH and sulfate ion on the electronic properties of the passive film on Fe-20Cr-15Ni
No full textDispelling 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
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