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Fractional visco-elastic Timoshenko beam from elastic Euler-Bernoulli beam
No full textThe Euler-Bernoulli beam theory is well established in such a way that engineers are very
confident with the determination of stress field or deflections of the elastic beam based on this
theory. Conversely Timoshenko theory is not so much used by engineer freelancers. However in
such cases Euler-Bernoulli theory, that neglects the effect of transversal shear deformation leads to
unacceptable results. For instance when dealing with the visco-elastic behavior, shear
deformations play a fundamental role. Recent studies on the response evaluation of visco-elastic
Euler-Bernoulli beam under quasi-static and dynamic loads, have been stressed that, for better
capturing the visco-elastic behavior, a fractional constitutive law has to be considered. In this
context it has been provided that, for homogeneous beam correspondence principle also holds,
then the study of a fractional visco-elastic Euler-Bernoulli beam may be derived from the elastic
one. As aforementioned in dealing with visco-elasticity the Timoshenko beam model is more
proper than Euler-Bernoulli’s one, then this paper provides important information to engineering
designers, introducing exact linking relationships between elastic Euler-Bernoulli beam response
and fractional visco-elastic Timoshenko beam response. The ready-to-use tables and
straightforward formulation have been provided leading to tremendous cost analysis savings and
improved quality
Timoshenko vs Euler-Bernoulli beam: fractional visco-elastic behaviour
No full textThe Euler-Bernoulli beam theory is well established in such a way that engineers are
very confident with the determination of stress field or def
lections of the elastic beam based on
this theory. Conversely Timoshenko theory is not so much used by engineers. However in such
cases Euler-Bernoulli theory that n
eglects the effect of transversal
shear deformation leads to
unacceptable results. For inst
ance when dealing with the visco-elastic behaviour the shear
deformations play a fundamental role. Recent studies [1]-[2] on the response evaluation of visco-elastic Euler-Bernoulli beam under quasi-static and dynamic loads, have been stressed that for better capturing the visco-elastic behavior a fractional constitutive law has to be considered. In this
context it has been provided that, for homogeneous beam both correspondence principles also hold,
then the study of a fractional visco-elastic Euler-Bernoulli beam may be derived from the elastic one.
As aforementioned in dealing with visco-elasticity the Timoshenko beam model is more proper
than Euler-Bernoulli’s one, then
this paper provides important informations
to engineering
designers, introducing exact linking relationships between visco-elastic Euler-Bernoulli beam solutions and visco-elastic Timoshenko
beam solutions. Thus the effect of transverse shear deformations may be taken into account for, without the need of a studying a more complicated model
Fractional visco-elastic Timoshenko beam deflection via single equation
No full textThis paper deals with the response determination of a visco-elastic Timoshenko beam under static loading condition and taking into account fractional calculus. In particular, the fractional derivative terms arise from representing constitutive behavior of the visco-elastic material. Further, taking advantages of the Mellin transform method recently developed for the solution of fractional differential equation, the problem of fractional Timoshenko beam model is assessed in time domain without invoking the Laplace-transforms as usual. Further, solution provided by the Mellin transform procedure will be compared with classical Central Difference scheme one, based on the Grunwald-Letnikov approximation of the fractional derivative. Moreover, Timoshenko beam response is generally evaluated by solving a couple of differential equations. In this paper, expressing the equation of the elastic curve just through a single relation, a more general procedure, which allows the determination of the beam response for any load condition and type of constraints, is developed. © 2015 John Wile
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
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
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