1,721,119 research outputs found
Figure 8 in The colonial ascidian fauna of Fiordland, New Zealand, with a description of two new species
No full textFigure 8. Synoicum stewartense (NIWA 49984): (A) zooid; (B) larva. Scale bars: A, 1 mm; B, 0.5 mm.Published as part of Page, M.J., Willis, T.J. & Handley, S.J., 2014, The colonial ascidian fauna of Fiordland, New Zealand, with a description of two new species, pp. 1653-1688 in Journal of Natural History (J. Nat. Hist.) 48 (27-28) on page 1667, DOI: 10.1080/00222933.2014.896487, http://zenodo.org/record/519387
Figure 9 in The colonial ascidian fauna of Fiordland, New Zealand, with a description of two new species
No full textFigure 9. Aplidium benhami (NIWA 49993): (A) orange zooid with developing larvae in the peribranchial cavity; (B) larva showing orange pigmentation; (C) larva showing structure of adhesive papillae and lateral ampullae; scale bars: A, B, 1 mm; C, 0.5 mm.Published as part of Page, M.J., Willis, T.J. & Handley, S.J., 2014, The colonial ascidian fauna of Fiordland, New Zealand, with a description of two new species, pp. 1653-1688 in Journal of Natural History (J. Nat. Hist.) 48 (27-28) on page 1669, DOI: 10.1080/00222933.2014.896487, http://zenodo.org/record/519387
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
Combined long and short time-scale X-ray variability of NGC 4051 with RXTE and XMM-Newton
No full textWe present a comprehensive examination of the X-ray variability of the narrow-line Seyfert 1 (NLS1) galaxy NGC 4051, one of the most variable active galactic nuclei (AGN) in the sky. We combine over 6.5 years of frequent monitoring observations by RXTE with a >100-ks continuous observation by XMM-Newton and so present an overall 2-10 keV power spectral density (PSD) covering an unprecedented frequency range of over 6.5 decades from <10-8 to >10-2 Hz. The combined RXTE and XMM-Newton PSD is a very good match to the PSD of the galactic black-hole binary system (GBH) Cygnus X-1 when in a 'high', rather than 'low', state, providing the first definite confirmation of an AGN in a 'high' state. We also find that a bending power law, rather than a sharply broken power law, besides being more physical, is a much better description of the high-state PSD of Cygnus X-1 and is also a better description of the PSD of NGC 4051. At low frequencies the PSD of NGC 4051 has a slope of -1.1 bending, at a frequency νB= 8+4-3× 10-4 Hz, to a slope of alphaH~-2. Although νB does not depend on photon energy, αH is steeper at lower energies. If νB scales with mass, we imply a black-hole mass of 3+2-1× 105 Msolar in NGC 4051, which is consistent with the recently reported reverberation value of 5+6-3× 105 Msolar. Hence NGC 4051 is emitting at ~30 per cent LEdd.NGC 4051 follows the same rms-flux relationship as GBHs, consistent with higher Fourier frequencies being associated with smaller radii.From the cross-power spectra and cross-correlation functions between XMM-Newton light curves in different energy bands, we note that the higher-energy photons lag the lower-energy ones. We also note that the lag is greater for variations of longer Fourier period and increases with the energy separation of the bands. Variations in different wavebands are very coherent at long Fourier periods but the coherence decreases at shorter periods and as the energy separation between bands increases. This behaviour is again similar to that of GBHs, and of MCG-6-30-15, and suggests a radial distribution of frequencies and photon energies with higher energies and higher frequencies being associated with smaller radii.Combining our observations with observations from the literature we find it is not possible to fit all AGN to the same linear scaling of break time-scale with black-hole mass. However, broad-line AGN are consistent with a linear scaling of break time-scale with mass from Cygnus X-1 in its low state and NLS1 galaxies scale better with Cygnus X-1 in its high state. We suggest that the relationship between black-hole mass and break time-scale is a function of at least one other underlying parameter which may be accretion rate or black-hole spin or both. <br/
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
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