1,720,957 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Get PDFWe 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
Developing luminescence dating methods to refine and extend the age range for the Chew Bahir Lake core from eastern Africa
No full textkoamabayili/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
Development of luminescence dating methods in tectonically active settings: dating seismic related fanglomerates in alluvial fans located in Coachella Valley, southern California
Get PDFMaster of ScienceDepartment of GeologyJoel Q. SpencerIn tectonically active arid and semi-arid regions like southern California, alluvial fans and their drainages record not only paleoenvironmental change but also fault movement. To be able to decipher this precious information, a suitable chronological method is required. For events occurring over Late Quaternary timescales, optically stimulated luminescence (OSL) dating is a chronological method that can be used in these settings; however, current OSL approaches are only suited to the fine sand deposits which are present as layers or lenses in the fan architecture. The problem with this sampling approach is that in many fan exposures such deposits are rare, limiting the applicability of OSL. In this study we have investigated the feasibility of a luminescence method for dating fanglomerates by sampling the coarse fraction and extracting the fine sand matrix for dating. Regarding this new approach, issues of partial bleaching and gamma dose-rate heterogeneity should be carefully considered; yet this is worthwhile since this method can greatly expand the applicability of OSL dating in similar settings.
We found that quartz in our sampling area is dim and has poor OSL characteristics, therefore, no ages are calculated based on quartz OSL. On the other hand, K-rich feldspar infrared stimulated luminescence (IRSL) was bright with good characteristics. We also conducted single grain IRSL on three samples (two fanglomerates and a fine sand layer) to investigate the extent of partial bleaching and equivalent dose (De) overdispersion in fanglomerate-derived grains. The data were then modeled with finite mixture model (FMM) using the Luminescence software package in R, allowing us to separate different components in the data. Assessment of gamma dose-rate heterogeneity in the fanglomerate environment was carried out by splitting the fanglomerate samples into 2 mm size fractions, and comparing data from high-resolution gamma spectrometry and ICP -AES/-MS analyses of the size fractions.
The two fanglomerate sample evaluation demonstrates that single grain analysis and finite mixture modeling (FMM) are essential for De assessment. Fanglomerate dose rate analyses by means of ICP -AES/-MS and high-resolution gamma spectrometry illustrate homogeneous environment for the 2mm proportions are indicative of dose rate heterogeneity probably due to different lithologies.
Our results from twelve samples indicate that alluvial fan formation in the Coachella Valley happened during both glacial periods and transition from glacial to interglacial periods. In the San Bernardino site, our depositional ages are concordant with the TCN surface age of Owen et al. (2014), indicating fast fan deposition during the marine isotope stage (MIS) 4 (65 ± 10 ka). The paleosol layer (78.81 ± 8.04 ka) beneath this fluvial setting suggest that soil development occurred mainly during the interglacial period MIS 5. In the Indio Hills (north of Biskra Palms) site, almost all depositional ages lie within interglacial periods: MIS 3, MIS 5, MIS 9 and the Holocene.
The calculated minimum slip rate along the Mission Creek fault in Indio Hills area based on the depositional age of sample MC1805 (~75 ka) is 7.0 ± 1.3 to 8.4 ± 1.4 mm/yr. This rate is smaller than the 12.2 to 21.7 mm/yr slip rate along the this fault at Biskra Palms (Behr et al., 2010). Since our OSL age provides a maximum age constraint (i.e. sediment deposition in the alluvial fan prior to offset) and hence a minimum slip rate, this rate could suggest that the slip rate along the Mission Creek fault is constant at least between Biskra Palms and Indio Hills. On the other hand, there is a possibility that the slip rate along the Mission Creek fault has slowed from the Biskra Palms toward the northwest and the slip might then have been transferred to the Banning fault
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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