1,721,086 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
Application of small punch testing on the mechanical and microstructural characterizations of P91 steel at room temperature
Get PDFThe use of small punch test (SPT) has emerged as a potential technique for mechanical characterization using miniaturized specimens. There is a strong interest in applying SPT for life prediction of power plant components operating at high temperatures. Another important application includes implementing surveillance programs for structural materials of nuclear plants where small volumes of irradiated samples are needed. In this work the small punch test was applied to study the mechanical behavior of P91 steel at room temperature. The selection criteria of the characteristic load PY in terms of two methods are discussed. Using this parameter the relationship with the yield stress is studied. The correlation factors were calculated from SPT curves. Microhardness was used to detect the most strained zones in a cross section of a punched specimen when reached its maximum load. The annular zone under the ball contact area, where the plastic thinning occurred up to maximum load, coincided with the highest microhardness values. Finally, transmission electron microscopy was employed to study the final microstructures after the deformation of the tensile and small punch tested samples. Refining of subgrains and considerable increasing of dislocation density was found with both, tensile and punch tested samples. By estimation of local strain and TEM observations it was confirmed the SPT produces higher deformation than that found with tensile test after rupture.Fil: Moreno Gomez, Mario Fredy. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentin
Effects of thickness specimen on the evaluation of relationship between tensile properties and small punch testing parameters in metallic materials
Get PDFhe assessment of the yield strength σYS from characteristic load PY obtained from small punch tests (SPT) was studied systematically in aluminum alloys and structural steels by variation in thickness of specimens. Four methodologies of calculating PY were considered: Mao and a modification of Mao methods and t/100 and t/10 offset methods. The attempt of correlation between σYS with PY/t2 by using a unique linear parameter of correlation α was reviewed. Under this framework, it is suggested that the dependence of this correlation factor α with each material cannot be avoided for the four methodologies used to calculate PY. The advantage to use the bottom displacement measurement during regime I of deformation is discussed on the assessment of Young modulus and PY. Finally, the representativeness of PY as the beginning of massive yielding of SPT specimen is also analyzed in terms of plastic energy EPL calculated from SPT plot. Based on the study of EPL evolution during the first regime of deformation, the t/100 offset method resulted the most suitable to select PY as characteristic parameter of the beginning of yielding when compared with the other three methods.Fil: Moreno Gomez, Mario Fredy. Comision Nacional de Energía Atómica. Gerencia de Área Investigaciones y Aplicaciones no Nucleares. Gerencia de Física (Centro Atómico Bariloche). División Física de Metales; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin
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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