1,720,955 research outputs found
Resonance versus Shape of Sedimentary Basins
No full textSediment-filled basins are of interest both in exploration geophysics and in earthquake
seismology in assessing their potential to amplify ground shaking. By means of numerical
models, we present a number of dimensionless ratios between the main resonance
frequencies that can be measured on the top of the basins and their geometry and
mechanical properties, under the hypothesis of rigid bedrock. These resonance frequency
ratios depend largely on the aspect ratio of the basins, whereas the mechanical properties
of the sediments (specifically, the Poisson’s coefficient) do not substantially affect the horizontal
resonance frequency ratios. We discuss whether the modal frequencies measured
on real basins can be used to extract information about the basins themselves and whether
the theoretical expected modal sequence can be used to design experimental surveys
aimed at assessing the dynamic behavior of basins
Seismic Station Installations and Their Impact on the Recorded Signals and Derived Quantities
Full text linkThe role of local geology in controlling ground motion has long been acknowledged.
Consequently, increasing attention is paid to the assessment of the geophysical properties
of the soils at the seismic stations, which impact the station recordings and a series
of related quantities, particularly those referring to seismic hazard estimates. Not the
same level of attention is commonly dedicated to the seismic station installation, to the
point that it is generally believed that housings and shelters containing seismic instruments
are of no interest, because they can only affect frequencies well above the engineering
range of interest. Using examples from seismometric and accelerometric
stations, we describe the (1) housing, (2) foundation, and (3) pillar effects on the seismic
records. We propose a simple working scheme to identify the existence of potential
installation-related issues and to assess the frequency fidelity range of response of
a seismic station to ground motion. Our scheme is developed mostly on ambient noise
recordings and, thus, surface waves. The hope is that, besides the parameters that start
to be routinely introduced in the seismic archives (VS30, soil classes, etc.), the assessment
of the maximum reliable frequency, under which no soil–structure interaction is
expected, also becomes a mandatory information. In our experience, for some installation
sites, the maximum reliable frequency can even be less than a very few hert
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
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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