1,720,968 research outputs found
Hazard and Risk Assessment tool for the Groningen Gas Field, the Netherlands
No full textIn October 2012, NAM (Nederlandse Aardolie Maatschappij BV) commenced with the study and data acquisition research program for induced seismicity in the Groningen gas field, North Netherlands. One of the aims of this program was to prepare a probabilistic seismic hazard and risk assessment (HRA) for the full area affected by the earthquakes induced by gas production from the Groningen gas field. To this end, a code was developed in C software, to calculate hazard and risk metrics. The tool uses the Monte Carlo approach, which was thought to be the most flexible approach allowing in the future potentially very complex computations to be incorporated in the tool and a large range of potential risk metrics to be evaluated. A drawback of the Monte Carlo approach is the high required computing time and large memory requirement. For optimal performance, the authors suggest to run the HRA-code on a mainframe computer. Post-processing suites are implemented and provided in Python. NAM is now making these codes openly available through the Dutch research infrastructure EPOS-NL. The model version that is made available is the model used by NAM for their last hazard and risk assessment in March 2020, with an update of the calibration of the seismicity model performed early 2023. Comprehensive documentation on model use is also provided. The present code was co-developed by a large team of programmers at Alten Netherlands. Corresponding author: Jan van Elk ([email protected]).
This publication is a follow-up to an earlier publication of the Hazard and Risk Assessment tool. The present version includes an update of the accompanying documentation
Hazard and Risk Assessment tool for the Groningen Gas Field, the Netherlands [updated]
No full textIn October 2012, NAM (Nederlandse Aardolie Maatschappij BV) commenced with the study and data acquisition research program for induced seismicity in the Groningen gas field, North Netherlands. One of the aims of this program was to prepare a probabilistic seismic hazard and risk assessment (HRA) for the full area affected by the earthquakes induced by gas production from the Groningen gas field. To this end, a code was developed in C software, to calculate hazard and risk metrics. The tool uses the Monte Carlo approach, which was thought to be the most flexible approach allowing in the future potentially very complex computations to be incorporated in the tool and a large range of potential risk metrics to be evaluated. A drawback of the Monte Carlo approach is the high required computing time and large memory requirement. For optimal performance, the authors suggest to run the HRA-code on a mainframe computer. Post-processing suites are implemented and provided in Python. NAM is now making these codes openly available through the Dutch research infrastructure EPOS-NL. The model version that is made available is the model used by NAM for their last hazard and risk assessment in March 2020, with an update of the calibration of the seismicity model performed early 2023. Comprehensive documentation on model use is also provided. The present code was co-developed by a large team of programmers at Alten Netherlands. Corresponding author: Jan van Elk ([email protected]).
There is an updated version of this data package been published. You can find it here; https://doi.org/10.24416/UU01-Z58L9
Dynamic Model (Eclipse Version) to predict the formation pressure response to gas extraction in the Groningen gas field, The Netherlands
No full textThe dynamic model of the Groningen gas field is used to predict the flow of water and gas in the reservoir and the areal distribution of reservoir pressure resulting from the withdrawal of gas from the reservoir. The main area of the model was primarily calibrated using measured reservoir pressure data, included in the present model publication. The dynamic model for the Groningen field was first prepared in MoReS/Dynamo, a proprietary reservoir simulation software owned by Shell. To facilitate further sharing and use of the dynamic model by external parties, NAM (Nederlandse Aardolie Maatschappij BV) has prepared a version of the model that can be used with the more readily available Eclipse software. The present publication contains the Eclipse version of the model. While Eclipse software requires a commercial license, it was considered as the most practical software package to host this model as 1) it is widely used for geological modelling and reservoir simulation and 2) the authors are not aware of open source software packages with similar functionality to MoReS/Dynamo, or that are able to efficiently run a model with the size and complexity of the present model for the Groningen gas field. The present Eclipse version of the model is openly shared by NAM, through EPOS-NL. Corresponding author: Jan van Elk ([email protected]
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
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
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