1,720,964 research outputs found
The Telluric Corrected IAG Solar Flux Atlas
No full textThe telluric-corrected IAG solar flux atlas was derived from ~100 spectra taken on the Vacuum Vertical Telescope (VVT) at the Institut für Astrophysik in Göttingen, Germany. The resolution of the data is R~106 . The spectra are iodine calibrated and span from 9020-19990cm-1 (500-1100nm).
The data are presented in fits tables. The IAG telluric corrected solar atlas is "iag_telfree.fits" with column names 'v', 's', 'err', 'flags' for the wavenumber array, solar spectrum, error, and flag array. Please refer to 'open_data.py' for details on the telluric spectra column names - this script will open the solar atlas and telluric spectra and plot each (check that the filenames and data path are correct before running).
Things to watch out for:
There are a few places where the continuum correction did not work well. Continuum stitching occurs at every multiple of 10cm-1. If you see a weird feature at one of these points, it could be due to mismatched continua on either end. Also around the laser line at 633nm the continuum offsets between spectra are not corrected well. This is due due to limitations in how offsets are corrected for in the fits, but this can be corrected for by performing your own continuum normalization to the spectra in this region.
Sometimes the spline model would try to fill in the core of a telluric line. These usually are identifiable using the flag array if you are using the solar model, but may affect telluric analysis since a slight over subtraction occurred in these lines. This effect is worse when the continuum is low (notably around 9200cm-1, 15233cm-1, and 16955cm-1). One could excise these points using the flag array to identify them and then interpolate over these regions if desired.
The iodine lines cause small, sharp residuals in the blue end of the spectra due to changes in the cell’s spectrum w.r.t. the template over time. The solar spectrum uncertainties capture these well, but note that these residuals will be worse in the telluric spectra.
All spectra were shifted to match the wavelength solution of the Salami & Ross 2005 iodine template
For more details, please refer to the paper, Baker et al 2020, The IAG Solar Flux Atlas: Telluric Correction with a Semi-Empirical Model. Questions are welcome; feel free to direct them to the corresponding author
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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