1,720,955 research outputs found
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
Lithofacies, provenance, and diagenesis of jura-cretaceous strata of the Northern Bowser Basin, British Columbia
No full textLithofacies, provenance, and diagenetic studies of more than 3 km of Late Jurassic to mid-Cretaceous silicilastic sediments exposed in the northern Bowser Basin (northern British Columbia) record the tectonic development of the Canadian Cordillera. Strata are divided into the undivided Bowser Lake Group and overlying Currier, McEvoy, and Devils Claw formations Lithofacies include marine mudstone, coarsening upward mudstone, fining upward sandstone, coarsening upward sandstone, chert pebble conglomerate, and coal. Common lithofacies associations are interpreted as a progression (from older to younger) of shallow marine, lower delta plain, upper delta plain, and alluvial braid-plain depositional environments. A subsidence model based on sediment compaction and isostatic load accounts for the necessary accommodation space.
The composition of the sandstone suggests an obducted island arc and oceanic crust asprovenance. Three petrofacies have been identified by modal analysis of framework grains. Petrofacies 1(P1), which occurs in undivided Bowser Lake Group and Currier Formation strata, (QtFL = 34-14-52;QmFLt = 9-14-77) is volcanic lithic rich with subequal to minor chert, minor monocrystalline quartz(generally <10%), and 10-25 % feldspar. Petrofacies 2 (P2) occurs in lower McEvoy Formation, and has higher concentrations of chert reflecting a recycled component in the sandstones, but also retains significant portions of volcanics (QtFL = 62-5-33; QmFLt = 5-5-89). Petrofacies 3 (P3) occurs in the upper McEvoy and Devils Claw formations, and is chert rich like P2, with less volcanic lithics and a small but significant portion of metamorphic lithic fragments (Qt =64 %, F=5%, L=31 %; Qm=7%,F=5%, Lt= 88 %). Paleocurrent directions indicate transport from northeast to southwest. Microprobe analysis of detrital chromian spinel accessory grains demonstrates alpine type peridotite occurs in the provenance. No spinels typical of mid-ocean ridge or Alaskan type complexes were found. The petrofacies and chromian spinel chemistry are consistent with a provenance from island arc and marginal basin lithosphere obducted onto the western margin of North America. Diagenetic history of the sediments provides insight into depositional and post depositional processes in the basin. Seven stages of cement paragenesis are recognized in the sandstones: 1) chlorite; 2) illite; 3) kaolinite; 4) dead oil; 5) quartz; 6) chlorite dissolution; and 7) calcite. Estimated precipitation temperatures begin below 80°C for chlorite, and increase to approximately 100°C to200°C for quartz, and to above roughly 200°C for calcite. Fluid inclusions in quartz cements support such temperature estimates. The succession of cements is interpreted to record replacement of original connate seawater by acid pore waters derived from organic matter maturation that were forced out by compaction of the interbedded muds. Carbon isotopes in carbonate concretions from the mudstones are consistent with formation during a late stage of methanogenesis. Oxygen isotopes from the same concretions suggest pore fluids in the muds at the time of formation were meteoric to brackish waters typical of cool temperate climates. Organic maturation was modelled by using vitrinite reflectance values from interbedded coals and mudstones, and assuming progressive heating as inferred from the sandstone cement paragenesis. Results of the model indicate that a high paleogeothermal gradient, similar to some back arc basins, best explains the diagenetic history of the northern Bowser Basin. Constraints from the lithofacies, provenance, and pore water evolution studies suggest the Bowser Basin began as a deep marine basin which was filled by sediment derived from island arc and marginal basin crust obducted earlier onto the western margin of North America.Science, Faculty ofEarth, Ocean and Atmospheric Sciences, Department ofGraduat
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
Lithostratigraphy, palynostratigraphy, and sedimentology of the Northern Skeena Mountains and their implications to the tectonic history of the Canadian Cordillera
No full textThe Skeena Mountains of north-central British Columbia contain exposures of more than 4500 m of Jura-Cretaceous strata deposited in the Bowser Basin. These strata were deposited as a result of tectonism that formed the Canadian Cordillera, and serve as a record of the tectonic history of the Cordillera.
The strata of the north-central Bowser Basin have been the subject of an integrated lithostratigraphic, palynostratigraphic and sedimentologic study in order to better understand the depositional history of the basin and the tectonic history of the Cordillera. The study area is in the northern Skeena Mountains, approximately coincident with boundaries of the Groundhog coalfield.
Four hthostratigraphic units are exposed in the study area. The upper three units, consisting of over 2000 m of strata, are well exposed, and are formally named herein, from oldest to youngest, the Currier, McEvoy and Devils Claw Formations. Underlying the Currier Formation is the informally named Jackson unit, which comprises the oldest exposed strata in the study area. Together, the Jackson unit and Currier Formation comprise the Bowser Lake Group. The McEvoy and Devils Claw Formations unconformably overlie the Bowser Lake Group and correlate with the Skeena Group.
Palynostratigraphy has been used successfully to correlate and date the sediments. Marine macrofossils are rare above the Jackson unit, necessitating use of palynomorphs to date the strata. Recovery of palynomorphs from anthracite rank coal measures has proven possible by extended treatment in Shulze's solution. The Currier Formation is suggested to be Late Jurassic (Oxfordian to Kimmeridgian or Tithonian) in age. The overlying McEvoy and Devils Claw Formations are entirely Cretaceous in age. The McEvoy Formation extends from the late Barremian or Aptian to the middle or late Albian, and the Devils Claw Formation spans the middle or late Albian to the Cenomanian. Two sedimentologically distinct deltaic sequences have been interpreted from the lithofacies associations. Both delta sequences probably accumulated in relatively shallow water, suggesting shallow shelf deposition. The older deltaic sequence occurs in the Currier Formation, and is analogous to facies of the modern Mississippi delta. The younger deltaic sequence encompasses strata of the McEvoy and Devils Claw Formation, and is more analogous to the coarse grained delta of the Copper River. The two delta sequences are separated by a hiatus of 20 to 35 million years. Sediment provenance, interpreted from paleocurrent data and clast lithologies, appears to have remained the same during deposition of both deltaic sequences. Paleocurrent indicators point to a source to the east-northeast, and the dominance of chert suggests a dominantly sedimentary source terrane, likely the Cache Creek Group. North American provenance is consistent with paleocurrent indicators and clast lithologies.
The tectonic history of the Cordillera is related to the depositional history of the Bowser Basin. Subsidence, as indicated by sediment accumulation, occurred during the Middle and Late Jurassic and probably decreased near the end of the Jurassic, leading to a period of tectonic quiescence in the Cordillera. Subsidence resumed near the end of the early Cretaceous, leading to another period of deltaic sedimentation. This second deltaic sequence, represented by strata of the McEvoy and Devils Claw Formations, is coarser than the Late Jurassic delta, which suggests a more rugged and proximal source area.Science, Faculty ofEarth, Ocean and Atmospheric Sciences, Department ofGraduat
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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