1,721,003 research outputs found
Remote Sensing of the Heliosphere with the Murchison Widefield Array
No full textThe Murchison Widefield Array (MWA) is one of the new technology
low frequency radio interferometers currently under construction at an extremely
radio quiet location in Western Australia. The MWA design brings to bear
the recent availability of powerful high-speed computational and digital signal
processing capabilities on the problem of low frequency high-fidelity imaging
with a rapid cadence and high spectral resolution. Solar and heliosphere science
are among the key science objectives of the MWA, and have guided the array
design from its very conception. We present here a brief overview of the design
and capabilities of the MWA with emphasis on its suitability for solar physics
and remote-sensing of the heliosphere. We discuss the solar imaging and inter-
planetary scintillation (IPS) science capabilities of the MWA and also describe a
new software framework. This software, referred to as Haystack InterPlanetary
Software System (HIPSS), aims to provide a common data repository, interface,
and analysis tools for IPS data from all observatories across the world.National Science Foundation (U.S.). Division of Atmospheric and Geospace SciencesNational Science Foundation (U.S.). Division of Astronomical Science
High Temporal and Spectral Resolution Interferometric Observations of Unusual Solar Radio Bursts
No full textWe report very high temporal and spectral resolution interferometric observations
of some unusual solar radio bursts near 1420 MHz. These bursts were observed on 13
September 2005, 22 minutes after the peak of a GOES class X flare from the NOAA
region 10808. Our observations show 11 episodes of narrow-band intermittent emission
within a span of ≈8 s. Each episode shows a heavily frequency-modulated band of emission
with a spectral slope of about −245.5 MHz s−1 [s superscript -1], comprising up to 8 individual blobs of
emission and lasts for 10–15 ms. The blobs themselves have a spectral slope of ≈ 0 MHz
s−1 [s superscript -1], are ≈200–250 kHz wide, appear every ≈400 kHz and last for ≈ 4–5 ms. These
bursts show a brightness temperatures in the range 1012 [10 superscript 12] K, which suggests a coherent
emission mechanism. We believe these are the first high temporal and spectral resolution
interferometric observations of such rapid and narrow bandwidth solar bursts close to 1420
MHz and present an analysis of their temporal and spectral characteristics.National Science Foundation (U.S.). Research Experience for Undergraduates (Program) (Grant AST-0138506
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
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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