1,720,956 research outputs found
Stresses at and in the neighbourhood of a near-edge hole in a plate subjected to an offset load from measured temperatures
No full textAn Airy stress function is used to process the associated temperature data and thereby determine the individual stresses in a plate containing a near-edge circular hole and which is subjected to a concentrated edge load away from the hole. Formulating the stress function so its origin is at the center of the hole enables the traction-free conditions to be imposed analytically on the edge of the hole. This significantly reduces the number of coefficients that must be retained in the stress function. Results agree with those from measured strains and the finite element method. The capability developed is applicable beyond the present situation, including with other measured quantities such as strains or displacements
Combining thermoelastic and stress function to evaluate individual stresses around a near-edge hole
No full textIndividual stresses are determined on and near the edge of a hole which is located below a concentrated edge-load in an approximate half-plane. Experimental thermoelastic data are combined with an Airy’s stress function. Coefficients of the stress function are evaluated from the recorded TSA data and the traction-free conditions on the hole boundary are satisfied by imposing srr = trq = 0 on the edge of the hole for all values of the angle q. This advantageously enables one to reduce the number of coefficients in the stress function series. The method simultaneously smoothes the measured input data, satisfies the traction-free boundary conditions and evaluates individual stresses on, and in the neighborhood of, the edge of the hole
Determining individual stresses around a near-edge hole in a plate subjected to an offset load using thermoelasticity
No full textThe paper combines an Airy’s stress function in real, polar coordinates with the experimental method of thermoelastic stress analysis (TSA) to determine the individual stresses in an aluminum half-plane which contains a near-edge circular hole, the plate being subjected to a concentrated edge load away from the hole. The coefficients of the stress function are evaluated from the thermoelastically measured data using the least squares method. Imposing the traction-free conditions analytically, rather than discretely, on the edge of the hole significantly reduces the number of coefficients one must retain in the stress function, the number of equations involved in the least squares process, and in some cases the amount of measured input data needed. Problems such as the present one can also be solved from photoelastically recorded isochromatics. However, whereas the latter approach necessitates time-consuming iterative non-linear least squares, the present TSA-based scheme only requires linear least squares. TSA, which can be applied to the actual material of interest (no model or coating is needed, other than perhaps being painted flat black to enhance the uniformity and emissivity of the material) benefits from the availability of contemporary commercial systems capable of providing extensive amounts of data in a matter of minutes
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
Thermoelastic determination of individual stresses in vicinity of a near-edge hole beneath a concentrated load
No full textAppropriate 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
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