1,720,969 research outputs found
In-situ analysis of the gas-emissions of the Eastern Carpathians (Romania) using the Multi-Gas instrument
Get PDFThe Multi-Gas instrument is an important tool for the investigations and monitoring of volcanic systems world- wide, because it can be easily placed on a volcano and can provide real-time data on the compositional changes of the fluids that are released (Aiuppa et al., 2005, Shinohara et al., 2005). We used a specially designed Multi-Gas to gather in situ compositional information about low-temperature, CO2-rich gases, emerging from different manifestations like dry gas emissions (mofettes), bubbling pools and springs.
The instrument is equipped with two IR sensors for CO2 (0-100%) and CH4 (0-7%) and one electrochemical sensor for H2S (0-200 ppm).
The Multi-Gas was used during several field surveys between September-November 2018 across the Eastern Carpathians area, where a total of 69 gas emissions were investigated for their CO2, CH4 and H2S concentrations. Concentrations of the different gas-species varied according to the geological context. The CO2 concentrations varied between 0.96 and 98.08 %. The highest values were measured in the the volcanic area of Ciomadul, the youngest volcano of the Eastern Carpathians (32 kyr, Harangi et al., 2015), characterized by high CO2 gas output up to 8700 t/year (Kis et al., 2017). High values were measured also in the thrusted and folded area of the Carpathian Flysch and, suggesting the tectonic control over the appearance of the gas emissions. The CH4 concentrations ranged between 0.21 and 6.76% and were higher at hydrocarbon-prone areas, such as the sedimentary deposits of the Transylvanian Basin and Carpathian Flysch. In these cases the CO2 concentrations were low (up to 4.6%).
The concentrations of H2S were higher at the volcanic area of Ciomadul, reaching values above the detection limit (∼200 ppm).
The Multi-Gas proved to be useful tool in the in-situ investigation of cold gas emissions of the Eastern Carpathians, being efficient especially for the measurement of the H2S concentrations that are very sensitive for oxidation processes.
This research belongs to the scientific project supported by the OTKA, K116528 (Hungarian National Re- search Fund), the EU and Hungary, co-[U+FB01]nanced by the European Regional Development Fund in the project GINOP-2.3.2-15-2016-00009 ‘ICER’, New York Hungarian Scientific Society and the Deep Carbon Observatory.
Aiuppa, A., Federico, C., Giudice, G., Gurrieri, S. 2005, Chemical mapping of fumarolic field: La Fossa Crater, Vulcano Island (AeolianIslands, Italy), Geophysical Research Letters, Vol. 32, LI3309
Harangi, Sz., Lukács, R., Schmitt, A.K., Dunkl, I., Molnár, K., Kiss, B., Seghedi, I., Á. Novothny, Molnár, M. 2015, Constraints on the timing of Quaternary volcanism and duration of magma residence at Ciomadul volcano, east-central Europe, from combined U-Th/He and U-Th zircon geochronology, Journal of Volcanology and Geothermal Research, 301, 66-80
Kis B.M. , Ionescu, A., Cardellini, C., Harangi, Sz., Baciu, C., Caracausi,C. & Viveiros, F. 2017, Quan- tification of carbon dioxide emissions of Ciomadul, the youngest volcano of the Carpathian-Pannonian Region (Eastern-Central Europe, Romania), Journal of Volcanology and Geothermal Research, 341, 119–130
Shinohara, H. 2005, A new technique to estimate volcanic gas composition: plume measurements with a portable multi-sensorsystem, Journal of Volcanology and Geothermal Research, 143, 319– 33
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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