1,720,958 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
Sedimentologic and lithostratigraphic properties and reservoir characterization of the Winnipeg Formation, Southern Saskatchewan
No full textA Thesis Submitted to the Faculty of Graduate Studies and Research In Partial Fulfillment of the Requirements for the Degree of Master of Science in Geology, University of Regina. vii, 112 p.The Winnipeg Formation is a Late Ordovician siliciclastic unit that occurs in subsurface of SE Saskatchewan. Deposition of the formation took place on the northern shelf of the sub-circular intracratonic Williston Basin. In the study area, the formation consists of two members: a lower sandstone-dominated Black Island Member and an upper shale-dominated Icebox Member. Core and well-log data from twenty-one wells, along with a detailed petrographic study of rock samples from the cores, have been collected, described, integrated, and interpreted. Textural properties, sedimentary structures, temporal stacking nature of the various lithofacies, and spatial correlation of the logged sections are significant tools used for deciphering the depositional environment, reservoir properties, and cyclostratigraphic analysis of the studied rocks. Ten lithofacies (eight quartz arenite and quartz wacke sandstones, one siltstone, and one shale) are recognized and interpreted as beach to lower offshore accumulations. The sandstone lithofacies are discriminated based on their textural and structural properties, e.g., grain size, bioturbation index (BI), hydrodynamic sedimentary structures, and matrix content. Well correlations show that the basin was somewhat funnel-shaped, with the central axis deepening southward, whereas uplifted flanks to the north and east define the direction of the shallower basin margins.
The vertical succession of the Winnipeg Formation is defined by shallow marine, high-energy sandstone of the Black Island Member overlain by relatively deep shelf shales of the Icebox Member. This stratigraphic succession underscores that deposition of the formation in the study area is characterized by a deepening-upward pattern. The Black Island Member's sandstone contains rhythmic units. Despite the overall deepening of the basin, the rhythmic units of the sandstone member underscore flooding events followed by progradation. These are parasequences within the transgressive systems tract. The transgression culminated during the deposition of the shales of the Icebox Member. The unconformity between Icebox and Yeoman Fm. defines the sea level drop and erosion of the uppermost beds (Roughlock Member) of the Winnipeg Formation. This regressive phase is represented by an erosional gap. Toward down south in North Dakota, there is a third member of the formation (Roughlock Member), which may represent the regressive phase of the T-R cycle.
Subsurface mapping shows variations in the thickness in three zones. Zone-1 constitutes most of the mapped area, and the isopach map shows that the formation thickens approximately 140m towards the southeast of the province. Zone-2 occurs west of Zone-1 and shows a relatively thinner distribution approximately 60m of the formation. This zone shows a northeast-southwest trend possibly controlled by high paleotopographic features. In Zone-3, the formation gets thicker, approximately 80m west of Zone-2. Depth structure map and 3D mapping show the basin was shallower towards the north, northeast, and northwest and deeper towards the south. The porosity interval map shows the thickness of the porous interval increasing southeastward.
The reservoir properties of Black Island Member are classified as quartz arenite, lithic arenite, two types of quartz wacke, feldspathic greywacke, and two types of mudrocks. Among the different well cores studied, the combined quartz arenite lithofacies constitute about 47% of the member, whereas the wacke and the mudrock lithofacies constitute 44% and 9%, respectively. Isopach maps of the various lithofacies indicate that the quartz arenites occur south to southeast, quartz wackes from southwest to southeast, and mudrocks toward the southeast of the studied area. Furthermore, the porosity of the quartz arenites ranges between ~22% and ~29%, whereas that of the wacke sandstone varies from ~8% to ~11%; these are affected by the different diagenetic processes. Thus, the sandstone lithofacies (the arenites and the wackes), which form a total thickness of about 91% of the member, are envisaged to constitute fair to excellent reservoirs.Studentye
Sedimentology and reservoir characteristics of the oligocene-early miocene carbonates (Kirkuk group) of southern Kurdistan
Get PDFKirkuk Group Formations (in addition to Avanah and Jaddala Formations) of
southern Kurdistan were studied in order to determine biostratigraphy,
chronostratigraphy and sequence stratigraphic relationships, in addition to major
sediment producing environments and type of platform configuration. As well as to
determine the paragenetic sequences with special attention to micrite diagenesis
and its effect on microporosity.
Five biozones were identified in the study area in which two of them from Middle-
Late Eocene: Alveolina biozone (AL) and Discocyclina biozone (DI) with three
biozones from the Oligocene-Early Miocene of Kirkuk Group: Nummulites fichteli
biozone (NF); Praerhapydionina delicata biozone (PD) and Austrotrillina howchini
biozone (AH).
Twenty two microfacies were identified and interpreted as having been deposited in
a ramp setting based on lateral variations of the microfacies; gradual deepening with
no evidence of slope break or effective barrier. A depositional model has been
generated from the overall palaeoenvironmental interpretations of the microfacies in
which the analysed microfacies indicates palaeoenvironments ranging from
terrestrial to open marine settings; nine major depositional environmental zones
have been identified and correlated with the standard Cenozoic ramp model of
Buxton and Pedley (1989). These zones distributed across the ramp setting dipping
southwest, in which zone 1 is terrestrial deposit; zone 2, 3, 4 and 5 are belonging to
inner ramp; zone 6, 7 and 8 are belong to middle ramp and zone 9 is belong to outer
ramp and basinal settings.
A paragenetic sequence has been derived recording eleven diagenetic processes
affecting the Kirkuk Group which are subdivided into an eogenetic, mesogenetic and
telogenetic stages. Furthermore, micrite matrices were studied from both shallow
and deeper marine settings using SEM, trace elements and carbon/oxygen isotopes;
the result shows the different sources; inner-mid ramp muds have a hemi-pelagic
source and could have been mostly sourced from high-Mg calcite benthic
foraminifera and red algae, and possible partial aragonite dominating; in contrast, the
outer ramp matrices, were sourced from plankton, are largely composed of low-Mg
calcite, as they are mineralogically stable. Although the exact origin would be difficult
to ascertain after diagenesis. From the above two different rock fabrics, two distinct
pore systems were identified: (1) low microporosity inner-mid ramp microfacies, it
was sourced from metastable precursors and were recrystallized and replaced under
meteoric waters, undergoing loss of primary porosity; (2) higher microporosity outer
ramp/basinal microfacies, composed of more stable low-Mg calcite that underwent
less recrystallization and retained some primary porosity.
The Kirkuk Group succession comprises of two shallowing upward 4th order cycle
within one 3rd order cycle located between two unconformable surfaces at lower and
upper boundaries which can be correlated to the global regression of sea level. The
first 4th order cycle is located at Rupelian and composed of only the Sheikh Alas
Formation and the second 4th order cycle is located at Chattian-Early Aquitanian
and composed of the Bajawan, Anah, Azkand and Ibrahim Formations. Two different
depositional sequences with different thicknesses were developed due to the
synsedimentary Khanaqin Basement Fault which cross-cuts the study area and was
activate during deposition
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
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
- …
