1,720,970 research outputs found
Robust satellite techniques (RST) for seismically active areas monitoring: the case of 21st May, 2003 Boumerdes/Thenia (Algeria) earthquake
No full textIn the last decades, several authors have claimed a space-time correlation between increases of Earth's emitted Thermal Infra-Red (TIR) radiation and earthquake activity interpreting such TIR signals as seismic precursors. The main problems of such studies regard data analysis and interpretation, which are often done without a validation/confutation test. In this context, a robust data analysis technique (RST, i.e. Robust Satellite Techniques) was developed which permits a statistically based definition of an "anomaly" and uses a validation/confutation approach. This technique was already applied to satellite TIR surveys in seismic regions for tens of earthquakes occurred in Europe, Asia and America. In this work, the RST approach has been applied for the first time to the African region to assess its potentialities in different geographical and climatic conditions. Eight years of Meteosat TIR observations have been analyzed in order to characterize the TIR signal behaviour in absence of significant seismic activity. Boumerdes/Thenia (Algeria) earthquake (occurred on 21th May 2003, Mb= 6.8) has been considered as test case for validation purpose, while a relatively unperturbed period (no earthquakes with Mbges4) has been analyzed in the confutation phase. The results show in the area of interest positive space-time persistent TIR anomalies about one month before the main shock (validation). Such anomalies generally overlap the principal tectonic lineaments of the region, sometimes focusing in the vicinity of the earthquake epicentre. No significant (in terms of relative intensity and space-time pemstence) TIR anomalies were detected during less seismically perturbed periods (confutation)
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
From GMOSS to GMES: Robust TIR Satellite Techniques for earthquake active regions monitoring
No full textDispelling 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
On the possible origin of Thermal Infrared Radiation (TIR) anomalies in earthquake-prone areas observed using Robust Satellite Techniques (RST)
No full textSeveral studies performed in the past 30 years suggested the existence of anomalous space-time transients, in the Thermal Infrared (TIR) radiation emitted by the Earth, possibly related to earthquake preparatory phenomena. Among various theories about their origin, the abrupt increase in greenhouse gas (such as CO2, CH4, etc.) emission rates was also proposed to explain the appearance of anomalous TIR signal transients in some relation with the place and the time of earthquake occurrence. As, under stable atmospheric conditions, the accumulation/dispersion of gases in the air depends on their molecular weight, CO2 tends to collect near the ground and layer forming “rivers” and/or “lakes” following terrain morphology close to its sources. On the contrary, the dispersion pattern of CH4, whose mass is smaller than that of CO2, is less affected by the terrain morphology so that the gas tends to be dispersed very readily, basically governed by the wind and normal atmospheric turbulence. If TIR anomalies are effectively related to exceptional degassing events, such differences should produce very different spatial/temporal patterns in the TIR anomalies observed, depending on the greenhouse gas emanated. In this paper, this hypothesis has been tested from different viewpoints and the results show that:
a)
an increase of only 2–3 times the normal CO2 mixing ratio level is sufficient to justify the excesses observed in TIR signal.
b)
areas dominated by diffusing gases which are heavier than the air (like CO2) show (as expected) anomalous TIR patterns which follow morphological lineaments (e.g. tectonic faults); in areas dominated by diffusing gases which are lighter than the air (like CH4) the TIR patterns observed spread over wide zones, following prevailing winds and diffusing around with less marked correlation with morphological lineaments.
c)
anomalous TIR patterns were observed over the Azerbaijan region during the Bozdag-Guzdak mud volcano eruption (May 1995), showing exactly the same spatial/temporal behaviour expected for methane-dominated degassing areas
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
- …
