1,721,005 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
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
Plutonium and uranium contamination in soils from former nuclear weapon test sites in Australia
No full textThe British government performed a number of nuclear weapon tests on Australian territory from 1952 through to 1963 with the cooperation of the Australian government. Nine fission bombs were detonated in South Australia at Emu Junction and Maralinga, and a further three fission weapons were detonated in the Monte Bello Islands off the coast of Western Australia. A number of soil samples were collected by the Australian Radiation Laboratories in 1972 and 1978 during field surveys at these nuclear weapon test sites. They were analysed by gamma spectrometry and, for a select few samples, by alpha spectrometry to measure the remaining activities of fission products, activation products and weapon materials. We have remeasured a number of these Montebello Islands and Emu Junction soil samples using the ANTARES AMS facility, ANSTO. These samples were analysed for plutonium and uranium isotopic ratios and isotopic concentrations. Very low Pu-240/Pu-239 ratios were measured at both sites (similar to 0.05 for Alpha Island and similar to 0.02 for Emu Field), substantially below global fallout averages. Well correlated but widely varying U-236 and plutonium concentrations were measured across both sites, but U-233 did not correlate with these other isotopes and instead showed correlation with distance from ground zero, indicating in situ production in the soils. © 2013, Elsevier Ltd
Plutonium and uranium contamination in soils from the former nuclear
No full textThe British government performed a number of nuclear weapon tests on Australian territory from
1952 through to 1963 with the cooperation of the Australian government. Nine fission bombs were
detonated in South Australia at Emu Field and Maralinga, and a further three fission weapons were
detonated in the Monte Bello Islands off the coast of Western Australia.
Analysis of neutron capture products and residual nuclear material from detonated nuclear
weapons can allow information on the weapon used to be inferred. In addition a nuclear forensic
examination of samples from well characterised sites such as these is an important exercise to
develop techniques for detection of clandestine nuclear activities.
A number of samples were collected by the Australian Radiation Laboratories in 1972 1978, 1983
and 1990 at the Monte Bello Islands, in 1977 from Emu field and in 1977 and 1984 at Maralinga as
part of site management and cleanup activities to gauge residual radioactivity levels. To this end
we have secured a number of soil samples from the ARL archives which had been collected from
the Monte Island and Maralinga sites. These samples were originally analysed for gamma emitting
fission products and in a few cases the residual weapon material, 239+240Pu, was analysed by alpha
spectrometry. We have now analysed some of these soils for plutonium and uranium isotopic
concentrations and also 240Pu:239Pu isotopic ratios using the ANTARES AMS facility, ANSTO. The
neutron capture product 233U was also analysed as a test of capability to detect the presence of
thorium fuel cycle activities in environmental matrices.Copyright (c) 2011 AMS1
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
Development activities in the accerlerator operations group development task
Full text linkThe Operations Group Development team within the ANSTO Accelerator facilities are currently persuing a number of activities to further develop our equipment and technical capabilities.
These include broadly;
*Electron Cyclotron Resonance Ion Sources
(ECRIS)
* Virtual Instrumentation
* Beam Profile Monitor Enhancements
* Vacuum System Operation Methods
* Current Digitisers/Integrator
- …
