1,721,024 research outputs found
Simultaneous observations of radon concentrations in soils and thermal remote sensing dynamics in a seismic active area
No full textThe paper deals with the simultaneous observation of two important environmental parameters: Land Surface Temperature (LST) and Radon (Rn) concentration. Both parameters have a consistent literature of observations in seismically active regions, especially in cases in which they are proposed as possible and reliable earthquake precursors. Till today their use is topic of discussion, explicitly related to the basic subject of the effective predictability of seismic activity. Theories also exist that link thermal infrared (TIR) emissions to Radon anomalous degassing considering its radioactive decay the cause of air ionization, water vapour condensing and release of latent heat. The simultaneous observation of two parameters was performed with two very different technologies which are best performing for each single observable: Radon is a heavy and quick to decay noble gas and can be monitored in soil, in water and in air. In this first experiment the air is inhaled by pumping from a well to notice its concentration in soil by radionuclide activity (Bq/m3); Land Surface Temperature is monitored through geostationary multispectral satellite, a technology which allow to perform a continuous and simultaneous survey of wide regions without variations of acquisition geometries and projection angles for each pixel. Geostationary thermal data have been frequently proposed to be the most useful mean to relieve thermal earthquake precursors in spite of their lower spatial resolution than those ones collected by polar satellites. The satellite thermal dynamics monitoring has been carried out by means of a recent processing technique, the Night Thermal Gradient, able to take advantage from the high time resolution of geostationary satellites and reach an important improvement in spatial resolution of maps looking at environmental thermal transients. The simultaneous observation of the two parameters was carried out along a bit more than one year but was heavily influenced by the stability of Radon sensor which went occasionally out of service. However, the first results are encouraging looking at some spikes in Rn time series that show similar timing of NTG spikes, frequently anticipating them. The comparison of the single station Rn monitoring and LST maps is especially interesting and need to be extended to more continuous data sets to confirm the presence of extended thermal anomalies at the time of a Rn spikes even in apparently absence of anomalies in the NTG time series of the only pixel containing the well of the Rn station
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
Geochemical measurements in water and soil and deformation in the Friuli-Venezia Giulia region (NE Italy).
No full textPossible relationships between strain, radon degassing and fluid geochemistry in tectonically active regimes: preliminary results from the Friuli Venezia Giulia region (NE Italy).
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
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