1,721,019 research outputs found
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
Micro-seismicity in the southwest Yukon, Canada
No full textThe objective of my research is to provide a better understanding of the relationship between the micro-seismicity, tectonics and crustal structure in southwest Yukon in order to improve seismic hazard assessments in this region. I used a combination of single event and multiple event location techniques to determine earthquake locations and depths. As well, frequency-magnitude statistics were calculated to analyze rates of seismicity and possible changes in the rates of seismicity.
The addition of the YUK array in August 2010 has enabled location of smaller events and detection of a systematic northeast trend of earthquakes. Seismicity is concentrated in four main areas: 1) Yaktutat Block-Fairweather Fault, 2) Duke River Fault, 3) Denali Fault, and 4) a NE-trend. There was relatively little seismic activity during this period along the northern Denali Fault segment and only a small amount of activity along the southern portion of the Denali Fault. There is significantly more seismic activity along the Duke River Fault and NE-trend and a clear region of seismicity just west and parallel to the Alaska-Yukon border between the Duke River Fault and northern Denali Fault. Frequency-magnitude statistics and seismic hazard analyses for southwest Yukon were improved by decreasing the minimum magnitude of completeness from M3.0 to M1.0. Between September 2010 and November 2011, event magnitudes ranged from 0.2 to 4.7 and depths from 0 to 35 km.
To address how the YUK array has improved single event locations and depths, we use a single-event location technique to monitor seismic activity. Only 37 of the 106 events detected for the Duke River Fault and NE-trend could potentially be located without the YUK array. When the Alaska Earthquake Information Center (AEIC) network was combined with the Canadian National Seismograph Network (CNSN), events within the NE-trend shift on average 6.6 km to the northeast and the depth increased on average 2.6 km. Within the Duke River and NE-trending clusters, there is an average maximum horizontal error of ±0.9 km and an average error in depth of ±3.2 km.
Free depths in the Duke River and NE-trending clusters range from 0 to 20 km. These depths are not well-constrained as the closest station is more than 20 km away. Two events within the southern Denali Fault cluster have well-constrained depths of 4.8 km and 8.2 km at distance less than ~8 km from station YUK6, consistent with upper crust (2-10 km) focal depths.
A Progressive Multiple Event Location technique (PMEL) was used to identify and better constrain spatial patterns along the Duke River Fault and NE-trend. Results clearly shows that events fall along the Duke River Fault and that the NE-trend events are located on a previously unidentified active fault.
To determine rates of seismicity and possible changes in the rates of seismicity, I examine b-values from frequency-magnitude statistics for each cluster of earthquakes before and after the 2002 M7.9 Denali Fault earthquake. b-values increased from 0.81 ± 0.14 to 1.05 ± 0.22 , suggesting higher Coulomb stress and more frequent smaller earthquakes.Graduat
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
Slip partitioning, crustal tectonics and deformation of the Queen Charlotte margin and northern Vancouver Island
Full text linkPart I of this thesis investigates current deformation in western British Columbia from northern Vancouver Island in the south to Haida Gwaii in the north. The area is characterized by transition from the Cascadia subduction zone to the Queen Charlotte transform fault. The tectonic setting involves interactions between the Pacific, North America, Juan de Fuca, and Explorer plates, and the Winona block, involving a number of plate boundaries: the mainly strike-slip Queen Charlotte, Revere-Dellwood-Wilson and Nootka faults, the Explorer ridge, and the Cascadia subduction zone. Using GPS campaign data from 1993 to 2008 I derive a new crustal velocity field for Northern Vancouver Island and the adjacent mainland, and integrate it with previous velocity fields developed for Haida Gwaii, southern Vancouver Island and the adjacent mainland. The northern limit of the subduction zone is confirmed to be at Brooks Peninsula, where the direction of the crustal motion changes abruptly from ENE to NNE. I use viscoelastic models to explore what percentage of the observed deformation is transient, related to the earthquake cycle, and how much is permanent ongoing deformation, distributed off the continental margin. Previous authors have developed two competing end-member models that can each explain how the Pacific/North America plate convergence is accommodated off Haida Gwaii. These models assume either internal crustal shortening or underthrusting of the Pacific plate. These new GPS data allow me to conclude that underthrusting does occur, and that a small component (<15%) of the observed data reflects long-term deformation. South of Haida Gwaii the distinction between transient and long-term deformation is not as clear; however, I conclude that transient deformation alone cannot fully explain the observed velocities, and so long-term deformation likely must also occur.
Part II of the thesis investigates the updip and downdip limits of the seismogenic zone of the Sumatra megathrust fault. Temperature and downdip changes in formation composition are controls proposed for these limits. To examine the thermal control I developed 2-D finite element models of the Sumatra subduction zone with smoothly varying subduction dip, variable thermal properties of the rock units, frictional heating along the rupture plane, and an appropriate thermal state for the incoming plate. The common updip thermal limit for seismic behaviour of 100-150°C occurs close to or at the trench in agreement with the rupture limit of the 2004 earthquake. Off central Sumatra the common downdip thermal limit range of 350-450°C occurs at 30-60 km depth. The 350°C isotherm location is in agreement with the earthquake limits but 450°C is deeper. North of Sumatra, 350°C occurs ~14 km deeper than the earthquake rupture limit. The proposed composition control for the downdip limit, the intersection of the subduction thrust with the forearc mantle, is at a depth of ~30 km, 140-200 km from the trench, in good agreement with the earthquake limits. These results support the conclusion that the Sumatra updip seismogenic limit is thermally controlled, but the downdip limit is governed by the intersection of the downgoing plate with the forearc Moho.Graduat
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