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
Double Photoionization of Water and Dissociative Electron Attachment to CF4
Get PDFThis thesis is an amalgam of two largely different experiments. While the exper-
imental apparatus are similar, the incident particles, fundamental interactions, and
dissociation dynamics of the two systems are entirely different. They are tied together
via momentum spectroscopy, occasionally called the ”momentum microscope”. The
two experiments each represent a fundamental pillar of the modern scientific regime.
For one, it is an observational first, producing an experiment that no other research
group has produced before. For the other, it is a check on reproducibility, an effort
by the scientific community to validate its efforts.
0.1 Water Experiment
The first of the two experiments included in this thesis is the double photoion-
ization of water by 57 eV linearly polarized photons. A 57 eV photon collides with
a water molecule and excites two molecular bonding electrons into the continuum.
The remaining dication, H2O2+, is generally considered unstable and has not been
observed in the laboratory. The unstable dication breaks apart, according to the
multi-dimensional potential energy surface(s) available to it. The momentum for
each of the charged particles - two protons and two electrons - are measured in co-
incidence. The measurement of the two protons allows for the full orientation of the
water molecule prior to dissociation. Prior to the writing of this thesis, this has only
been achieved in a ”recoil axis” frame, aligning two fragments of a complex molecule
that breaks apart upon one bond, including the simplest case of a diatomic molecule.
The full three dimensional momentum resolution of the entire molecule, and its pho-
toelectrons, is new terrain in momentum spectroscopy. The energies of the recoil
ions and electrons, as well as their angular distributions, are measured and analyzed
in an attempt to match the repulsive dication states of the water molecule to the
asymptotic fragment configurations in both two- and three-body reaction pathways.
The water experiment was conducted at the ALS with other members of the
COLTRIMS collaboration from Kansas State University, University of Frankfurt,
and Auburn University. The data was given to the author of this thesis as a training
exercise in data analysis - training on the actual acquisition of data using COLTRIMS
came later, in the second experiment of this thesis.
The details of the experimental apparatus, the excitation of the dication, and
its subsequent decay are the focus of the first two chapters of this thesis.
0.2 CF4 Experiment
The second experiment is dissociative electron attachment to C F4. Electron at-
tachment is an electron scattering interaction wherein a low energy electron, typically
from 0-15 eV in energy, collides with a molecule and is trapped in a local potential
minimum, a so-called Shape Resonance. Alternately, the electron can collide with
the molecule and couple with some internal degree of freedom, forming a negative
ion, a so-called Feshbach Resonance. These thesis chapters focus on the situation in
which the electron attachment leads to a dissociative negative ion state, with inci-
dent electron energies ranging from 5.5 eV to 9 eV. The angular distributions found
match, at least qualitatively, those of previous experiments, although the precise
partial wave analysis of those distributions disagree slightly with the literature. The
most interesting data, those taken as the primary motivation for the experiment,
are the KER measured as a function of the incident electron energy for the reaction
pathway leading to C F3−. These results disagree with the most recent results in the
literature which, on their own, disagreed with all the previous results in measurement
of this quantity.
The maintenance, repair, and troubleshooting of a COLTRIMS experiment are
rigorous endeavors, and the C F4 experiment gave the author of this dissertation
the opportunity to learn the minutiae of the complex experimental procedure. This
process took place, chronologically speaking, well after the analysis of the water
experiment was under way. While this ordering of training may initially appear
backwards, it was an invaluable layering of technical training, granting the author
many opportunities to revisit the skills required as a physicist, from deep literature
searches to vacuum pump maintenance to data analysis
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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