1,720,982 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
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Study the pKa of C–H Bonds and Proton-Coupled Electron Transfer Process by Transition Metal Complexes via Computational Methods
No full textComputational techniques, mostly density functional theory (DFT), were applied to study metal-based catalytic processes for energy conversion reactions. In the first and second projects, the main focus was on activation of the light alkanes such as methane, which have thermodynamically strong and kinetically inert C–H bonds plus very low acidity/basicity. Two Mo-oxo complexes with the different redox non-innocent supporting ligands, diamide-diimine and ethylene-dithiolate, were modeled. These Mo-oxo complexes are modeled inspired by active species of a metalloenzyme, ethylbenzene dehydrogenase (EBDH). The results for the activation of the benzylic C–H bond of a series of substituted toluenes by modeled Mo-oxo complexes show there is a substantial protic character in the transition state which was further supported by the preference for [2+2] addition over HAA for most complexes. Hence, it was hypothesized that C–H activation by these EBDH mimics is controlled more by the pKa than by the bond dissociation free energy of the C–H bond being activated. The results suggest, therefore, promising pathways for designing more efficient and selective catalysts for hydrocarbon oxidation based on EBDH active site mimics. Also, it is found that the impact of supporting ligand and Brønsted/Lowry acid/base conjugate is significant on the free energy barrier of C–H bond activation.
In the third project the focus was on assessing the nature of hydrogen in the transition state related to the transfer of hydrogen between a carbon and nitrogen in an experimentally studied hydroaminoalkylation process by a five-coordinate Ta complex. It was revealed that, for the studied substituents, pKa is a larger driving force in the rate-determining hydrogen transfer reaction than the BDFE, which suggest a reasonable amount of protic character in the transition state, and possible routes to the design of more active catalysts with greater substrate scope.
Finally, for the last project, the focus was on hydrotris(1,2,4-triazol-1-yl)borate complex as an electrocatalyst and study the impact of metal identity down a group or across a period of the d-block on proton-coupled electron transfer (PCET), which is a key process in many electrocatalytic cycles. The studied thermodynamics and kinetics trends for a series of mid to late 3d- and 4d-transition metals show the metal and its electronic structure greatly impact the nature of the PCET processes
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
A method to provide accessibility for visual components to vision impaired
Get PDFNon-textual graphical information (line graphs, bar charts, pie charts, etc.) are increasingly
pervasive in digital scientific literature and business reports which enabling readers to easily
acquire the nature of the underlying information . These graphical components are commonly
used to present data in an easy-to interpret way. Graphs are frequently used in economics,
mathematics and other scientific subjects. In general term data visualization techniques are
useless for blind people. Being unable to access graphical information easily is a major obstacle
to blind people in pursuing a scientific study and careers .This paper suggests a method to
extract implicit information of Bar chart, Pie chart, Line chart and math’s graph components of an
electronic document and present them to vision impaired users in audio format. The goal is to
provide simple to use, efficient, and available presentation schemes for non textual which can
help vision impaired users in comprehending form without needing any further devices or
equipments. A software application has been developed based on this research. The output of
application is a textual summary of the graphic including the core content of the hypothesized
intended message of the graphic designer. The textual summary of the graphic is then conveyed
to the user by Text to Speech software .The benefit of this approach is automatic providing the
user with the message and knowledge that one would gain from viewing t
Non-visual representation of complex documents for use in digital talking books
Get PDFAccording to a World Intellectual Property Organization (WIPO) estimation,
only 5% of the world\u27s one million print titles that are published every year
are accessible to the approximately 340 million blind, visually impaired or print
disabled people. Equal access to information is a basic right of all people. Essen-
tial information such as flyers, brochures, event calendars, programs, catalogues
and booking information needs to be accessible by everyone. Information helps
people to make decisions, be involved in society and live independent lives. Ar-
ticle 21, Section 4.2. of the United Nation\u27s Convention on the rights of people
with disabilities advocates the right of blind and partially sighted people to take
control of their own lives. However, this entitlement is not always available to
them without access to information. Today, electronic documents have become
pervasive. For vision-impaired people electronic documents need to be available
in specific formats to be accessible. If these formats are not made available,
vision-impaired people are greatly disadvantaged when compared to the general
population. Therefore, addressing electronic document accessibility for them is
an extremely important concern. In order to address the accessibility issues
of electronic documents, this research aims to design an affordable, portable,
stand-alone and simple to use "Complete Reading System" to provide accessible electronic documents to vision impaired
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
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