1,721,018 research outputs found
1D Model validation for the variations in Earth's apparent resistivity of Barricelle site (southern Italy)
No full textQuantifying persistent behavior in earth's apparent resistivity time series
No full textThe multiple segmenting method (MSM) has been applied to investigate the scaling behaviour in the Earth's apparent resistivity time series, measured in a seismic area of southern Italy. The study of apparent resistivity represents one of the most important scientific challenges in the studies devoted to the geophysical monitoring. Our results show that apparent resistivity is characterized by a persistent scaling behvaiour at all the periods considered, with the scaling exponent tending approximately to 0.5
A new magnetotelluric monitoring network operating in Agri Valley (Southern Italy): study of stability of apparent resistivity estimates
No full textExtracting quantitative dynamics in Earth’s apparent resistivity time series by using the detrended fluctuation analysis
No full textThe magnetotelluric method (MT) consists in the observation of the surface natural variations of the electromagnetic field in a broad range of periods. The apparent resistivity is proportional to the modulus of the surface impedance, which is the tensorial relation between the horizontal components of the electric with the magnetic field. The subsurface resistivity distribution is obtained by inverting the apparent resistivity.
The method of the detrended fluctuation analysis (DFA) has been applied to investigate the dynamics of apparent resistivity, which. represents one of the most important scientific challenges in the studies devoted to the geophysical monitoring. Our results show that during July 2003 the time series representing variations of the apparent resistivity in the seismic area of Val d'Agri (southern Italy) are persistent at all the periods considered, tending to pure randomness with the increase of the period. Due to the relationship between the period and the depth, the observed variations are compatible with resistivity changes in the shallow layers
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
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