1,721,077 research outputs found
Experimental analysis of a model isolated at the base with rubber-layer roller bearings (RLRB)
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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
Evolutionary Model of Viscoelastic Dampers for Structural Applications
No full textThe effects of temperature on the energy dissipation of viscoelastic dampers (VED) for seismic mitigation of structures are investigated. In order to simulate the damper behaviour, an evolutionary model is proposed to describe the dependence of the mechanical properties of the damper on the deformation frequency and the temperature increase due to dissipation. The heat losses of the material due to radiation and conduction are neglected in the evaluation of the increase of temperature of the damper during operation.
Thermorheologically simple materials are considered and the influence of the deformation frequency on the storage and loss moduli is modelled using fractional derivatives operators. The effect of material temperature on the force-deformation relation is modelled using the concept of evolutionary transfer function and the proposed model is implemented using a step-by-step technique in the frequency domain. The predictions of the proposed model in the case of sinusoidal and seismic deformations show good agreement with experimental results.
Finally, the response spectra of single-degree-of-freedom structures with added VED and subjected to seismic excitation are computed using the proposed evolutionary model; the results obtained show that the thermal effect due to energy dissipation is not always negligible
Heat Generation Effects on Viscoelastic Dampers in Structures
No full textThe first part of this paper is concerned with the response of viscoelastic dampers subjected to transient temperature conditions caused by heat generation during cyclic deformation. Simple tools for modeling viscoelastic materials are discussed and verified using experimental data obtained in a test program on shear dampers using polymer Scotchdamp 109 of The 3M Company conducted at the Laboratory of the Civil Engineering Department of the University of California at Berkely. The second part of this study is a numerical investigation of the effects of heat generation on the response of structures with supplemental viscoelastic dampers with the aim of defining design guidelines for structures incorporating this type of dissipator
Kelly, J. M.
No full textSee entry in Lee County volume 6, page 123: https://digital.archives.alabama.gov/digital/collection/voter/id/276
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