1,720,962 research outputs found
Integrated InSAR-GPS Monitoring of an Underground Gas Storage (UGS) Field: The Minerbio Pilot Test
No full textIn 2014 the Italian Oil & Gas Safety Authority published technical guidelines (Italian Guidelines for monitoring the seismicity, ground deformation and pore pressure) to regulate the monitoring of all existing and future underground activities on the Italian territory. The guidelines suggested that ground deformation monitoring of underground activities was carried out by integrating InSAR and continuous GPS techniques to detect possible surface deformation phenomena linked to the monitored activities during the considered time interval, and to provide information of their space-time variations with respect to the background conditions. The guidelines application on underground gas storage (UGS) was tested on the Minerbio gas field under the supervision of the National Institute of Geophysics and Volcanology (INGV). At the time of the pilot test, Minerbio had a high-quality record of about 15 years of InSAR data and 10 years of CGPS data (from the MINE station). The presented case study shows how the Minerbio ground deformation monitoring system was implemented during the testing phase. The time series of MINE, sited in 2008 in a peripheral area of the field, show that it measures seasonal oscillations in the North-planar component and a certain seasonality in the East-planar component: considering such results, the InSAR data were used to identify a proper site for a second CGPS station with the aim to integrate the results of MINE. The new station MIN2 was placed in 2019 in the center of the field, near the vertical and East-planar InSAR amplitude peaks. The correlation analysis between the CGPS signals and the cumulative curve of UGS volumes of the Minerbio field indicates a strong correlation in the North-planar component for the MINE station and a strong correlation in the East-planar and vertical components for the MIN2 station. According with ILG target, such results indicate that: (i) MIN2 effectively integrates the MINE results by detecting the peak of UGS-related, vertical and East-planar oscillations, (ii) the current geometric configuration of the two-station CGPS system effectively integrates the InSAR information by giving information on the spatial distribution of the North-planar component of ground deformation, and (iii) the integrated InSAR-CGPS monitoring system provides a complete picture of the distribution of UGS-related ground deformations on the Minerbio field
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
Predicting the Volume of Influence of an Underground Gas Storage Reservoir: Application to a Real-World Case in Italy
No full textA methodological approach is proposed in order to define and evaluate the rock volume surrounding an underground gas storage (UGS) reservoir that is potentially subjected to a stress perturbation due to the storage activities. The analysis is based on a coupled computational modeling approach combining flow dynamics with geomechanics in the reservoir. Long-term records of injected and produced gas volume and pore pressure are used to calibrate a 3-D fluid-dynamic reservoir model, which is enlarged to the active surrounding aquifer to evaluate the extent of the propagation of the pressure variation. A multi-year detection of the land motion above the reservoir can lead to the development of a reliable geomechanical model of the UGS site, similarly to the procedure developed by Teatini et al. [2011] and Janna et al. [2012], including the prediction of the mechanics of the faults possibly intercepting the investigated rock volume. The mechanics of faults is simulated by a fully implicit algorithm by means of recent computational strategies based on Lagrange multipliers [Franceschini et al., 2020, 2022a,b]. The combined action of the fluid-dynamic and geomechanical models can predict the propagation of the stress disturbance generated in the reservoir and its surroundings during the cyclic injection-extraction process. The analysis of the propagation of the stress disturbance during UGS activities allows to define the rock volume surrounding the reservoir that is potentially affected by the mining operations. The definition of this volume has a twofold motivation: (i) to identify the region where the monitoring program should be focused during the execution of the UGS activities; (ii) to exclude those occurrences, such as micro-seismic events located outside the identified volume, that cannot be related with the UGS activities. Copyright 2024, Society of Petroleum Engineers
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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