1,720,966 research outputs found
Sovereignty as a Social Issue: The case of Inuit Nunangat.
No full textYoung researcher Mark Vardy, Queen’s University, Canada, talks here in the NRF 6th open assembly in Hveragerði, Iceland, in September of 2011.
Please click on the link above to see the video
Time to Depth Seismic Reprocessing of Vintage Data: a Case Study in the Otranto Channel (South Adriatic Sea)
No full textVintage seismic data are of significant value for the scientific community, especially when reprocessed with up-to-date methodologies. In this chapter, we demonstrated that a specific processing flow and velocity modeling workflow can significantly improve the imaging of geological features within old data. In particular, the proposed time reprocessing flow enabled us to overcome aliasing problems related to low fold coverage that affected the performance of SRME and PSTM. To avoid spatial aliasing, we included two interpolation steps in the processing sequence, which increased the fold coverage for SRME and migration, respectively.
The application of both SRME and WEMA algorithms strongly attenuate the energy of multiple reflections, showing that this is also an optimal approach for treating vintage, low coverage seismic data.
The temporal resolution has been improved by broadening the frequency bandwidth and applying a designature procedure consisting of three main steps: deghosting, Q correction, and surface consistent deconvolution.
A specific velocity modeling workflow was adopted, using the coherence inversion technique to build an optimal initial model and then using both the layerbased and the grid tomography to refine it. The final velocity model enables a
reliable depth image of the MS-29 seismic line for the first time.
The reprocessing and depth imaging of the MS-29 seismic line lead to an easier and more reliable interpretation of the seismic horizons, seismic facies, and seismic amplitude anomalies. Our major new geological insights in the South Adriatic Sea can be summarized as follow:
Gas chimneys and wipe-out zones testify to the presence of gas. This presence is consistent with some bright spots related to gas accumulation, which we interpret inside the Plio-Quaternary sequence.
The stratigraphic architecture of the Apulia CP is related to reactivation of normal faults and sea level changes triggering different depositional systems. Above the northern margin, a coral reef is interpreted, drowned below the Pliocene sequence.
The base of the Carbonate Platform, underlying the pelagic Middle Jurassic-Neogene sequence of the South Apulia Basin, has been evidenced at a depth of 4 s TWT, approximately corresponding to 5 km.
At the foot of the southern margin of the platform, a chaotic wedge is likely related to tectonic activity during Neogene time, probably associated with faults activity. Also, we identify a chaotic layer within both basins that we attribute to mass transport deposits.
An active transpressive system has been recognized which cuts the Albanian-Hellenic Chain, allowing the Corfù Arc to migrate further west then the Albanian Chain. Earthquakes recorded in the same region could be related to the intersection of the fault system with an isolated carbonate platform present inside the South Apulia Basin.
Above a regular deposition of Pliocene layers, which covers in continuity the South Adriatic Basin, the Apulia CP, and the South Apulia Basin, the Pleistocene sequence is thicker at the top of the carbonate platform and is thinning. This is due to no deposition or erosion, above both basins, where the seismic profile is slightly west of the axial depocenter. This suggests that the sea bottom currents connecting the Adriatic and the Ionian seas were particularly efficient only since the Pleistocene. During the Messinian sea level drop, this connection was probably barred by the Apulia CP promontory
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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