1,721,474 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Feasibility of Breeding in Hard Spectrum Boiling Water Reactors with Oxide and Nitride Fuels
No full textThis study assesses the neutronic, thermal-hydraulic, and fuel performance aspects of using
nitride fuel in place of oxides in Pu-based high conversion light water reactor designs. Using
the higher density nitride fuel hardens the neutron energy spectrum and results in higher
breeding ratios.
The state-of-the-art high conversion light water reactor, the Resource-renewable
Boiling Water Reactor (RBWR), served as the template core upon which comparative studies
between nitride and oxide fuels were performed. A 1/3 core reactor physics model was
developed for the RBWR using the stochastic transport code MCNP. The code was coupled
with a lumped channel thermal-hydraulics 5-channel model for steady-state analyses. The
depletion code MCODE, which links MCNP with ORIGEN, was used for all burnup
calculations. Select physics parameters were calculated and with the exception of the void
coefficients, agreed with reported data. The void coefficients of the coupled core were
calculated to be slightly positive using two different methods (10% power increase and 5%
flow reduction).
The standard RBWR assembly designs, which use tight lattice hexagonal fuel rod
arrays, with oxide fuel were then replaced with various nitride fuel assembly designs to
determine the potential increase in breeding ratio, the potential to breed with pressurized water,
and the potential to improve the critical power ratio with a wider pin pitch. Without changing
the assembly geometry or discharge burnup, using nitride fuel resulted in a breeding ratio of
1.14. Using single-phase liquid water, the nitride fuel RBWR assembly resulted in a conversion
ratio of 1.00. Another nitride fuel assembly design with boiling water maintained a 1.04
breeding ratio while increasing the pitch-to-diameter ratio from 1.13 to 1.20. This modification
increased the hot assembly critical power ratio from 1.22 to 1.36, as calculated using the Liu-
2007 correlation.
A high-porosity nitride fuel is recommended for high burnup conditions, to
accommodate the nitride fuel’s higher swelling and less favorable mechanical properties
compared to the oxide fuel. The high porosity allows additional volume for pressure-induced
densification, alleviating swelling and subsequent cladding strain. To predict the performance
of high-porosity nitride fuel, fission gas and fuel behavior mechanistic models were developed
for high burnup and low-temperature conditions. These models were validated with reported
irradiation data and implemented, along with fuel material properties, into the steady-state fuel
behavior code FRAPCON-EP. Under simulated RBWR conditions, a fuel density no more than
85% of theoretical density is recommended to maintain satisfactory fuel performance.ArevaMassachusetts Institute of Technology Study on the Future on The Nuclear Fuel Cycl
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Full text linkWe 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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