1,720,957 research outputs found
“Linear diffusion domain” approach for modeling the kinetics of electrodeposition: a two-dimensional study
No full textA study is presented on diffusion-controlled growth of multi-nuclei systems in 2D space. The effect of correlation among
diffusion fields on growth law of nuclei is investigated by means of numerical computations. The outputs of these simulations
are employed to test the validity of the analytical approach based on the concept of linear diffusion domain. Both growth lawof
single nucleus and the total rate of film growth have been investigated by taking into account the finite-size effect of nuclei on the
size probability density of the Voronoi cells. It is shown that the linear-diffusion-domain approach provides a satisfactory
description of such an involved process. The application of the Voronoi cell approach is extended to a 3D system and makes
it possible to determine the kinetics of nucleus growth as a function of cell size
Modeling and testing of high frequency GPR data for the evaluation of structural deformation
No full textCrystallization Study of Ge-Rich (GeTe) m (Sb 2 Te 3 ) n Using Two-Step Annealing Process
No full textA combination of X-ray diffraction and Raman scattering is employed to investigate (GeTe) m (Sb 2 Te 3 ) n alloys crystallized by thermal annealing from the amorphous (a-) phase. The films are deposited by molecular beam epitaxy on Si(111) substrates. First, a series of a-GeSbTe (GST) films of different composition is deposited and studied by Raman spectroscopy to identify the Ge-rich features of the alloys. Second, the crystallization properties of Ge 10 Sb 2 Te 13 are studied upon different annealing conditions. The aim of this work is to develop a procedure to avoid segregation of Ge and GeTe at the GST crystallization onset (T x ). This is here achieved by means of an incubation step at temperature lower than T x . The crystallization onset T x increased to 270 °C, which is about 160 °C higher compared to a reference GeTe sample, while the alloy always crystallizes in the stable Ge 1 Sb 2 Te 4 composition. The increase of T x is observed for all annealing conditions, regardless the amount of crystalline Ge segregated. For the optimized annealing treatment, the presence of Ge nanocrystals along with crystalline GeSbTe is unveiled by Raman measurements, paving the way for the control of the microstructure and electrical/thermal properties of Ge-rich alloys
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
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