1,721,022 research outputs found
Modal analysis of continuous systems with damping distributions defined according to fractional derivative models
No full textIn this paper vibrating continuous linear systems with generalized damping distributions defined according
to fractional derivative models are studied in terms of modal analysis, defining and discussing the
orthogonality properties of their eigenfunctions. Closed form expressions are presented for the response
functions both in the time and in the frequency domain. The attention is focused on the impulse response
functions and the receptances, the former enabling the calculation of both transients and responses due to
arbitrary distributions of external forces. In particular, the free response problem is analyzed considering
different ways of expressing the initial conditions. As a numerical example, the developed theoretical tools
are applied to the study of a viscoelastic cantilever Euler-Bernoulli beam
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
Frequency domain analysis of a fractional derivative SDOF system
No full textThis paper presents a study of the frequency domain
behaviour of a single degree of freedom (SDOF) system with a
fractional derivative model, named Fractional Kelvin-Voigt.
Frequency response functions (FRFs) as receptance and
transmissibility are analytically studied. Then the model is
applied to describe the dynamic behaviour of a magnetomechanic
system in the frequency domain, consisting of a body
of para or dia-magnetic material vibrating in a field created by a
pair of magnets
Depth effects on zebra mussel reproduction
No full textMale and female Dreissena polymorpha from 2 m depth in Lake Iseo, northern Italy, spawned synchronously, and their gametogenic cycle followed the annual pattern previously observed in other Italian and European populations. Water temperature of 12degreesC and phytoplankton blooms triggered spawning, and seasonal variation in gametogenesis was related to photoperiod. Some mussels at 25 m depth always had active gonads, and reproduction continued all year, with no seasonal gametogenic phases. Hypolimnetic environmental conditions, such as slight variation in water temperature, darkness and low food availability, may cause this reproductive strategy. No evidence of hermaphroditism or modified sex ratios were noted at either depth. Gametogenesis and spawning ability of zebra mussels in the hypolimnion must be reconsidered
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
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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