1,720,986 research outputs found
Improving Io Plasma Torus models using Galileo Doppler data
No full textThe Io Plasma Torus (IPT) is a toroidal cloud of plasma, centered on the centrifugal equator of Jupiter at Io's orbital distance, that induces a path delay and a carrier frequency shift on radio frequency signals. Juno is currently orbiting Jupiter in a highly eccentric, 53.5-day orbit, with a perijove altitude of about 4000 km. During each perijove pass, Doppler measurements between Juno and the Earth are acquired for about eight hours centered around Jupiter's closest approach. Due to the orbital geometry, the radio frequency signal crosses the IPT, yielding a non-dynamical Doppler shift, that, if not properly calibrated, can be a potential source of bias in the Jupiter estimated gravity field coefficients. During the first perijove pass (conventionally named PJ01), a direct measurement of the downlink plasma contribution was possible by transmitting downlink signals at X and Ka-band coherent with a common X-band uplink. During the perijove passes dedicated to gravity investigations (currently PJ03, PJ06, PJ08, and PJ10) a dual-frequency link at X and Ka band allows to calibrate about 75% of the total plasma contribution on the signal, including the one due to the IPT. During non-gravity dedicated perijove passes a communication link at X band only is available, so that the signal due to the IPT can be corrected only using a model of its internal electron density distribution. Here we propose to improve the model already available in the literature using radio science Doppler data from other space missions, such as Galileo. NASA's Galileo spacecraft arrived to the Jupiter system on December 1995 and studied the Galilean satellites, Jupiter and its magnetosphere, for the following 8 years. However, the orbiter's umbrella-like High Gain Antenna (HGA) failed to correctly deploy, so that the spacecraft was able to operate using only the low-gain antenna (LGA) at S band, with its downlink data rate being much lower than originally planned. Moreover, this prevented any dual-frequency calibration of the radio link that could have corrected the dispersive signal induced by the IPT, potentially affecting the radio science experiment results. We re-analyzed Galileo Doppler measurements acquired by the Deep Space Network during the flybys of the Galilean satellites, using a local orbit determination fit, highlighting the presence of residual un-modeled signatures. The signatures were compared to the expected Doppler signal due the IPT, computed using models already available in literature, suggesting that the IPT can be effectively calibrated, removing the residual signatures, adjusting some of the model parameters
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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