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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
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The Genus Isoëtes L., evolution, diversification and population structure in a free-sporing heterosporous lycophyte.
Full text linkAmong land plants, one of the most cryptic lineages is the genus Isoëtes L., both in terms of public awareness and appearance. Taxonomically, \textit{Isoëtes} are members of the vascular plant Division Lycopodiophyta, the sister lineage to the more well-known and lineage rich Euphyllophyta, which includes both the Monilophytes (ferns) and Spermatophytes (seed plants). Lycophytes are comprised of three extant lineages, the homosporous order Lycopodiales, which have the greatest extant generic diversity within the lineage, and the heterosporous Selaginellales and Isoetales, both of which are contemporarily monogeneric. Lycophytes are united by a few key features, including the microphyll, a leaf type unique to the lineage, and adaxial placement of the sporangia on the sporophylls. Like the Monilophytes, Lycophytes are free-sporing plants. As such, they have a pronounced alternation of generations, with a large, dominant diploid sporophyte producing haploid spores via meiosis, which go on to germinate into haploid gametophytes. These gametophytes produce either or both haploid eggs and sperm, which unite within the gametophyte’s archegonia to produce a new diploid sporophyte embryo.The Isoëtalean lycopods, both extinct and extant, are particularly unique among their relatives due to both a suite of unusual characters. One of the first and most obvious of them is their growth form. Unlike their fellow lycophytes, which have unipolar growth, meaning they grow and elongate via a terminal apical meristem on the shoot system, and produce adventitious roots from this stem axis, Isoëtaleans have bipolar growth like most Spermatophytes. And, like the non-monocot Spermatophytes, the Isoëtaleans undergo secondary growth, adding both cortical tissue and secondary vascular tissue via a meristematic region known as the prismatic layer. In the extinct Isoëtalians, these two traits allowed them to become arborescent, with some of the largest members, such as Lepidodendron Sternberg growing to over ten meters tall.Today, Isoëtes is the only remaining member of Isoëtales Prantl. The genus appears to have arisen in the Triassic and can be found throughout the non-polar regions of the world in seasonally to permanently hydric to aquatic habitats. Morphologically, Isoëtes have a highly conserved base bodyplan; almost all of them are small, perennial, semi-herbaceous geophytes whose body is comprised of a highly reduced 1-3 lobed, corm-like trunk, an apical rosette of long, simple, linear leaves, and numerous roots that emerge from their basal furrow. Species are identified through a combination of habitat, spore color, ornamentation and size, leaf morphology, corm lobe numbers, and size of the plants themselves. Because their morphology is so conserved, species identification can be difficult in areas where multiple taxa overlap, especially when the taxa in question are close relatives, as the plants are known to readily hybridize with one another, or form allopolyploids.Modern Isoëtes can be broken up into five distinct sub-clades, which predominantly correspond to their geographic range. There is the Gondwanan clade, which is found in Southern Africa, South America, India and Australia. The Laurasian clade, which occur in the Mediterranean region of Europe and North Africa, North America, and India. The Italian clade, which occurs in and around the Italian peninsula. The Austro-Asian clade, found in Eastern and Southern Asia, India and Australia. And the American clade, which is found in North and South America, as well as a few circumboreal species, and the only known species in Oceania. Because Isoëtes is so morphologically conserved, prior to molecular phylogenetics it was assumed that spore morphology or habitat types defined the taxonomic groups, which we now know not to be the case. In fact, these traits are quite labile, particularly when polyploids are involved.In this dissertation, I explore the evolution of one of the traits in extant Isoëtes through ancestral state reconstruction, as well as conduct multi-locus population genetic and phylogenetic analyses to determine if the species composition in one of the sub-clades found on the West Coast of North America
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
The Genus Isoëtes L., evolution, diversification and population structure in a free-sporing heterosporous lycophyte.
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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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