1,720,971 research outputs found
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
Space time variation of lightning activity over northeast India
Full text linkThis paper presents a study of space-time variation of flash rate density over Northeast India (NEI) by using monthly satellite-based lightning flash grid (0.5° x 0.5° : 55 km x 55 km) data for a period of 10 year (1998-2007). The data are examined in terms of spatial, annual and seasonal distribution of the flash rate density. It is found that lightning flash rate density is maximum (55 flkm2 yr1) over the west of northeast India. This high flash rate density is attributed to the topography and the geography of NEI along with the moisture availability over the region. The inter-seasonal comparison of the flash rate density shows that the occurrence of the highest flash rate density during pre-monsoon is due to convective instability giving rise to Nor'westers. Orography of the region and the availability of the moisture control the development of thunderstorm during monsoon season. Shifting of the maximum lightning activity longitudinally during post-monsoon is attributed to the northeast monsoon activity. Development of front-like situation in the low altitude western region of the NEI, due to interaction of dry and cold air from higher latitudes with the warm and moist air caused by Western disturbances, trigger the thunderstorm development process over the region during winter season. The annual variation of flash rate density over the NEI exhibits two peaks- one prominent peak in April and the other smaller peak in September. The first peak is associated with intense insolation, extension of moisture content to the lower tropospheric level and prevailing synoptic condition over the region. The second peak is mainly controlled by the moisture content in the air and the orography of the area. The differences in the values for rain yield in the premonsoon and monsoon seasons may be due to the differences in the cloud microphysical and electrical properties. There is good parallelism in the variation of flash rate density and CAPE. The correlation coefficient between these two parameters is 0.90 which is highly significant at <0.0001
Lightning activity over India: A study of east-west contrast
No full textThis article presents a study of east–west regional contrast in lightning activity over India (8°N–35°N, 68°E–98°E) using monthly satellite-based lightning flash grid (0.5° × 0.5°) data for a period of 10 years (1998–2007). On the premise of nearly equality to land mass location for the Inter-Tropical Convergence Zone (ITCZ), India is divided in two regions – eastern and western – spanning the 79°E longitude line. The spatial variation of the east–west contrast shows that lightning flash rate density is higher over east-northeast India (30 flashes km−2 year−1). The lower elevation of the eastern region is an important factor in maintaining a maximum surface temperature contrast in regard to influencing the development of strong convection and thunderstorms, and hence high flash rate density. The results suggest that the hot and humid extensive land region of the ITCZ in the eastern region is more likely to lead to the development of thunderstorms and high flash rate densit
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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