1,721,038 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
This is the second year we have combined the work of the Logging and Reservoir Delineation groups at the Earth Resources Laboratory. In the first part of this report,
we present work related to logging and petrophysics, including the ongoing work of
electroseismics. This summary describes briefly the contributions of each paper in this
group.
Most of our focus in logging the past year was in understanding the physics of
dipole logging in an azimuthally anisotropic medium, and the processing algorithms
used in characterizing such a medium. In Nolte and Cheng (Paper 2), we analyzed a
cross-dipole data set in extreme detail. We found that the Alford-type rotation appears
to be stable in the anisotropic region of the data. The extra degree of freedom
we used by allowing the principal axes to be nonorthogonal did not affect the results
significantly. Furthermore, the rotation angles are consistent for all seven independently rotated source-receiver pairs. Velocities, on the other hand, are another matter. We used both the semblance method and the homomorphic method to estimate the fast
and slow shear wave velocities from the rotated traces, and compared our results with
those provided by the contractor. We also obtained estimates of velocity anisotropy
from cross-correlation of the principal traces after the rotation. Although all of the processing shows similar variations in the velocities over our interval of interest, the actual velocities varied more than 10 percent. This is probably the result of the large dispersion of the flexural waves. More analysis is necessary to determine the most robust method of obtaining the shear wave velocities.
Paper 3 (Zhu et al.) deals with laboratory dipole logging measurements in a rock
sample with both fast and slow shear wave velocities higher than the acoustic velocity of
water. The authors show evidence of a Stoneley wave that may be coupled to the flexural
waves. Since we really do not have a well-understood theory for such a condition, more work needs to be done to see if any new information can be obtained from this "flexural
Stoneley" mode.
In an area where we have a better understanding of the underlying theory, Tao
and Cheng (Paper 4) investigated the effects of gas-saturation, lithology, and borehole
environment in the determination of permeability from Stoneley waves. This work combined
the previous work in our group of Xiao-Ming Tang, Xiaomin Zhao, and Kazuhiko
Tezuka, among others. The results indicated that small amounts of gas can significantly
affect Stoneley wave dispersion and attenuation. Moreover, in a gas-saturated reservoir,
the Stoneley wave sensitivity to permeability is increased significantly, so that permeability as low as a few millidarcies can be detected effectively. The vertical extent of the permeable zone (as opposed to a fracture) needs to be around 0.5 meters for effective detection.
Tadeu et al. (Paper 5) deals with the numerical modeling of full waveform and
dipole logs using mode summation techniques. Their method is capable of modeling
tool ex-centering and other geometrical effects.
The next series of papers (Zhu and Toksiiz, Paper 6; Mikhailov et al., Paper 7; and
Haartsen and Toksiiz, Paper 8), investigate the electroseismic phenomenon in detail,
using theory, numerical modeling, laboratory scale modeling, and field experiments.
The results demonstrate that the electroseismic effect is indeed real and observable in
the field. This topic is still in the initial stages of development and we will continue the development of the electroseismic technique as a practical tool for detecting fluid flow
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
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
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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