1,720,999 research outputs found
Recalibration of the Intensity Prediction Equation in Italy Using the Macroseismic Dataset DBMI15 Version 2.0
Full text linkWe re-compute the coefficients of the intensity prediction equation (IPE) in Italy using the data of the DBMI15 V2.0 intensity database and the instrumental and combined (instrumental plus macroseismic) magnitudes reported by the CPTI15 V2.0 catalog. We follow the same procedure described in a previous article, consisting of a first step in which the attenuation of intensity I with respect to the distance D from macroseismic hypocenter is referred to the expected intensity at the epicenter IE and a second step in which IE is related to the instrumental magnitude Mi, the combined magnitude Mc, the epicentral intensity I0 and the maximum intensity Imax, using error-in-variable (EIV) regression methods.
The main methodological difference with respect to the original article concerns the estimation of the uncertainty of IE to be used for EIV regressions, which is empirically derived from the standard deviation of regression between IE and Mi and also used for the regressions of IE with Mc, I0 and Imax.
In summary, the new IPE determined from DBMI15 V2.0 is
I=I_E-0.0081(D-h)-1.072[ln(D)-ln(h)]
where D=√(R^2+h^2 ), h=4.49 km and IE can be calculated from the intensity data distribution of the earthquake. If the intensity data distribution is not available, IE can be calculated from the following relationships
I_E=-2.578+1.867M_w
I_E=I_
Reply to “Comment on ‘Unbiased Estimation of Moment Magnitude from Body‐ and Surface‐Wave Magnitudes’ by R. Das, H. R. Wason, and M. L. Sharma and ‘Comparative Analysis of Regression Methods Used for Seismic Magnitudes Conversions’ by P. Gasperini, B. Lolli, and S. Castellaro” by J. Pujol
No full textWe suspect that most criticisms by Pujol (2017,
hereafter, P17) were originated by a misunderstanding of our
article (Gasperini et al., 2015) that the author himself frankly
admits (“Some of the arguments made in the paper were not
completely clear to the present author” p. 11) and maybe
even by a misunderstanding of the textbook of Fuller
(1987). In the following, we will discuss in general the main
P17 criticisms, whereas detailed answers to all of them are
reported in the Appendix.Published548–5514IT. Banche datiJCR Journa
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
Harmonic Fluctuation of the Slope of the Frequency–Magnitude Distribution (b‐Value) as a Function of the Angle of Rake
No full textPrevious works suggested that the slope (b-value) of the frequency–magnitude distribution of earthquakes might significantly vary as a function of the style of faulting. In this work, we resume such hypothesis using improved datasets and procedures and by testing a simple harmonic functional form of the b-value as a function of the angle of rake λ.
Using the Global Centroid Moment Tensor (CMT) catalog updated to the middle of 2016, we reliably compute the b-value over 12 nonoverlapping rake windows with width γ 30° showing a clear oscillating behavior with highs for normal and lows for reverse mechanisms. We also test the existence of a spatial link between variations of the style of faulting and of the b-value by determining the rake and the b-value separately from the Global CMT catalog and from a magnitude homogenized version of the bulletin of the International Seismological Centre, respectively, based on a spatial tessellation of the Earth’s surface.
For both approaches, we verify, using two statistical methods, that the b-values computed from earthquakes with different tectonic styles are actually different from each other for many combinations of rakes and particularly for all combinations of almost pure tectonic styles.
We find that the fitted harmonic function has zero phase and unit frequency, thus indicating that b-value modulation is about proportional to −sin λ. Because the latter corresponds to the dot product between the unit versors of the coseismic displacement and of the gravity force component along the fault plane, b-value modulation appears to be about proportional to the work done by the gravity force during the fault slip
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