1,720,961 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
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
Diffusion in Solids: Fundamentals, Methods, Materials, Diffusion-Controlled Processes
No full textDiffusion is a vital topic in solid-state physics and chemistry, physical metallurgy and materials science. Diffusion processes are ubiquitous in solids at elevated temperatures. A thorough understanding of diffusion in materials is crucial for materials development and engineering. This book first gives an account of the central aspects of diffusion in solids, for which the necessary background is a course in solid state physics. It then provides easy access to important information about diffuson in metals, alloys, semiconductors, ion-conducting materials, glasses and nanomaterials. Several diffusion-controlled phenomena, including ionic conduction, grain-boundary and dislocation pipe diffusion, are considered as well. Graduate students in solid-state physics, physical metallurgy, materials science, physical and inorganic chemistry or geophysics will benefit from this book as will physicists, chemists, metallurgists, materials engineers in academic and industrial research laboratories
Diffusion in Metals and Intermetallics: an Overview
Get PDFAfter a few remarks about the history of diffusion in solids we remind
the reader to some basics of diffusion such as tracer diffusion, interdiffusion, high-
diffusivity paths, and basic diffusion mechanism in solids. We then summarize
self-diffusion in cubic, hexagonal metals and metals with phase transformations.
Then we summarize diffusion of substitutional impurities (solutes) in metals and
remind the reader to the phenomena of slow solute diffusion in aluminium and of
fast solute diffusion in polyvalent metals. We finish the part on solute diffusion
with some remarks on interstitial impurities We start the part on intermetallic
alloys by reminding the reader to some of the more frequent structures. We
consider examples of the influence of order-disorder transformation on diffusion.
We then discuss diffusion in cubic B2-structured phases and in B2-, L12 - and DO 3-
intermetallics, We then discuss uniaxial L1 0 -intermetallics and C11 b-structured
molybdenum disilicide. We finish with some remarks diffusion in the cubic Laves
phase Co2 Nb.:1. Introduction – some historical remarks
2. Some basics
2.1 Tracer diffusion
2.2 Interdiffusion
2.2.2 The ‘random alloy’ approximation for interdiffusion
2.2.1 Boltzmann-Matano method
2.3 High-diffusivity paths in solids
2.4 Diffusion mechanisms in solids
3. Self-diffusion in metals
3.1 Cubic metals
3.2 Uniaxial metals
3.3 Metals with phase transitions
4, Impurity diffusion in metals
4.1 Diffusion of substitutional impurities
4.2 Slow impurity diffusion in aluminium
4.3 Fast impurity diffusion in polyvalent metals
4.4 Diffusion of fast diffusing interstitial impurities and of hydrogen
5. Diffusion in Intermetallics
5.1 Some structures of intermetallics
5.2 Influence of order-disorder transitions on diffusionThis work is licensed under a Creative Commons Attribution 4.0 International License.
To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/1
5.3 Diffusion in B2 phases and B2-intermetallics
5.4 Diffusion in L12-intermetallics
5.5 Diffusion in DO3-intermetallics
5.5 Diffusion in L10-intermetallics
5.6 Diffusion in C11b-structured molybdenum disilicide
5.6 Diffusion in the Laves phase Co 2N
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
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