1,721,150 research outputs found
A unified seismic catalog for the Iranian plateau (1900-2011)
No full textThe first seismograph in Iran was installed in 1959, and this
marked the beginning of the national seismic catalog. The seismic
network grew with years, but its coverage, the instrumental
features, and the details of magnitude calculation changed over
time, resulting in a highly heterogeneous national seismic
catalog.
In this work, we present a unified and homogeneous catalog
for the Iranian plateau (Mw ≥4), created by merging data
from two local catalogs and seven international agencies, each
one covering the magnitude scale and period illustrated in
Figure 1. This operation requires the conversion of different
magnitudes used by the single agencies to a common type.
The moment magnitude (Mw) is chosen as reference for its
physical meaning (Kanamori, 1977) and because it does not
saturate. In this attempt to convert different magnitude scales
to Mw, regression relations that take into account errors on
both variables are used, and a specific statistical analysis shows
that the region under study (24°N–42°N, 43°W–66°E) is
better described when subdivided into two tectonic domains,
Zagros and Alborz–Central Iran, characterized by different regression
relations. A precedence scheme is then established to
select the magnitude value to be preferred when the same event
is reported by several catalogs with different magnitude scales
and/or values. The resulting unified catalog for the Iranian plateau,
spanning 1900–2011, is finally presented also in a declustered
form for time-independent seismic hazard estimates
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
Re-assessing the intensity values of Iranian earthquakes using EMS and ESI scales
No full textIran is a region with high seismicity but reliable seismometric networks were installed in this country only in the last decades. Hence, the analysis of macroseismic effects (seismic intensity) could be the only possible way for defining the parameters of most Iranian earthquakes. Various authors reported the intensity estimates of earthquakes in this region using different macroseismic scales. To apply modern methods of determining macroseismic parameters, intensity values need to be expressed in a uniform scale. In this study, we attempt such homogenization by considering all information we can find from the literature consisting of both descriptions of effects and intensity values to build a dataset of intensities for the Iran region as most complete as possible. We adopted the European Macroseismic Scale (EMS) as the reference scale as it is the most recent one and particularly detailed on building damage. We also considered the Environmental Seismic Intensity (ESI) scale in order to use information on environmental effects (ground deformation, landslides, liquefaction, etc.) that are poorly detailed by EMS. We compare our application of two scales based on a dataset of Iranian earthquakes for which we have descriptions of effects on both building (EMS) and environment (ESI), and found that, in about 80% of cases, assessed EMS and ESI intensities coincide one to other within one degree, that is the uncertainty which can be reasonably assumed for standard intensity estimates. In cases where we were not able to find the original descriptions of effects in literature and only intensity estimates reported in various scales, we convert these values by table of correspondence. In summary, we assessed intensities in a homogeneous scale for 512 Iranian earthquakes from 658 through 2013
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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