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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
Begonia dalaiensis B. Das, J. Saikia & D. Banik OP 2022, sp. nov.
No full textBegonia dalaiensis B. Das, J. Saikia & D. Banik sp. nov. (Fig. 1, 2) Type: — INDIA. Arunachal Pradesh, Anjaw District, towards Chaglagam, near Meepani bridge, 28°15’53.6’’N, 96°34’28.95’’E, elevation 1335 m, 25 March 2022, Bikas Das, Jadumoni Saikia & Dipanwita Banik CSIR-NEIST 0205, (Holotype: CAL, Isotype: ASSAM, CSIR-NEIST) Diagnosis: —The species in its vegetative form shows greatest similarities with the widely distributed B. acetosella, B. longifolia and B. roxburghii due to its erect nature, caulescent habit and baccate ovary. The new species differs from B. acetosella based on male inflorescence with 12–16 flowers, 3-locular ovary and 2 styles (vs. 3–5 flowers in male inflorescence, 4-locular ovary with 4 styles); from B. longifolia in having a dioecious sexual system and 2 styles (vs. monoecious sexual system and 3 styles); and from B. roxburghii in having a 3-locular ovary with 3-horns, possessing 2 styles (vs. 4-locular ovary with 4 horn like projections bearing 4 styles). Dioecious, caulescent erect herb, perennial, up to 80 cm tall. Rhizome 5–8 cm. Stem branched, erect, slender, green with red tint and white spots, ridged, glabrous, internodes 5–20 cm long, 3–6 cm thick at node. Stipules thick, triangularovate, apex acuminate, glabrous, 1–1.5 × ca. 0.5 cm. Petiole green, ridged like the stem, glabrous, 4.5–9.5 cm long. Leaf blade ovate-lanceolate, 10–18 × 6–10 cm, asymmetric, venation palmate, basifixed, base slightly overlapping to non-overlapping, cordate-oblique, apex acute-acuminate, margin entire, green above, pale green underneath, glabrous on both surfaces. Inflorescence cymose, axillary, peduncle highly reduced, 12– 16 male flowers and 3– 9 female flowers per inflorescence. Bracts greenish-brown, lanceolate-linear, glabrous, nerved, apex acuminate, base truncate, 10–11 × ca. 7 mm, caducous. Staminate flower pedicel glabrous, white to pale pink, 18–25 mm long; corolla ca. 3 cm across, tepals 4 (2+2), white to pink, glabrous, fleshy; outer tepals 2, ovate-elliptic, concave, white-pinkish white, veins somewhat distinct, margin entire, apex rounded-cordate or somewhat erose, 1.4–1.5 × 1.2–1.3 cm; inner tepals 2, glabrous, white to pink, elliptic, margin entire, apex rounded, ca. 1.4 × 1 cm; androecium cylindrical, ca. 10 × 11 mm, stamens 60–90, 5–6 mm long; anther oblong, yellow, 2–2.5 mm, connective extended at apex, apex acuminate, dehisces through lateral longitudinal slits. Pistillate flower pedicel glabrous, 18–22 mm, white-pink, corolla fleshy, 2.8–3 × 2–2.5 cm across; tepals 5, white, unequal, 1–1.7 × 0.6–0.8 cm, oblong to obovate, glabrous, shiny, veins distinct, margin entire, apex rounded, erose; styles 2, free, yellow-white, 0.5–0.8 cm, stigmatic surface twisted; ovary baccate, tri-locular, glabrous, green, tri-horned, placentation axile, placentae bifid, ca. 13 × 7 mm. Fruits not seen. Etymology:— The specific epithet is named after the type locality “Dalai Valley” of Anjaw district, known for its great floristic wealth. Distribution and ecology:— The species shares its habitat with Impatiens sp., Elatostema sp., Melastoma sp., Polygonum sp. and some ferns. It grows along moist shady mountain slopes near streams as well as in forest understory and roadside (Fig. 2). Phenology:— Flowering during March-April. Specimens examined: INDIA. Arunachal Pradesh: Anjaw district, near Meepani bridge, 1335 m, 24 March 2022, B. Das, J. Saikia, D. Banik (CSIR-NEIST 0215) fls.; Lohit district, Hayuliang road, 27°56’00.7”N, 96°21’18.7”E, 1680 m, 06 August 2022, B. Das, J. Saikia, D. Banik (CSIR-NEIST 0210). Conservation status:— Begonia dalaiensis is currently known from two districts of Arunachal Pradesh. Four populations were discovered comprising a total of less than 200 individuals. Based on GeoCAT analysis (Bachman et al., 2011), the species has an extent of occurrence of 38 sq. km area and area of occupancy of 16 sq. km. However the populations are in an almost linear configuration in the montane forest area which greatly reduces the EOO. In addition there is a chance that additional populations could occur in the nearby areas with similar habitats. The data from our initial field survey needs adding to before we are confident in assigning a threat category to B. dalaiensis. Hence, according to the IUCN Standards and Petitions Committee (2022), we provisionally assign B. dalaiensis to the Data Deficient category (DD). Notes:— Begonia dalaiensis belongs to B. sect. Platycentrum based on having a rhizomatous habit, extended anther connectives, 3-locular ovary and convolute stigma; the sectional placement is supported by the molecular phylogeny. The species shows close affinities with the Himalayan species of the former section Sphenanthera, which are mostly comprised of dioecious Begonia with baccate fruits. B. giganticaulis is another dioecious species reported from southern Xizang, China, which shows close affinities with the new species, but differs in attaining a height up to 4 m and in having shortly crested ovary and flowering during June-October whereas B. dalaiensis from Arunachal Pradesh, India grows to approximately 80 cm, has a horned ovary, and flowers in March-April. The differences among these taxa are summarised in Table 2. Phylogenetic position:— The final dataset comprised 408 bases including gaps, with 263 conserved, 66 variable and 79 parsimony informative sites, respectively. The phylogram obtained from Maximum parsimony analysis and Bayesian analysis showed identical tree topology (Fig. 3). The three accessions of the new species formed a clade (BI = 1.00, BS = 96.54%), sister to a clade of the morphologically similar dioecious taxa B. giganticaulis, B. acetosella var. acetosella and B. acetosella var. hirtifolia Irmsch. All species sampled resolved as monophyletic.Published as part of Das, Bikas, Saikia, Jadumoni, Konwar, Parthapratim, Siga, Appu & Banik, Dipanwita, 2022, A new dioecious species of Begonia (Begoniaceae) from Arunachal Pradesh, India, pp. 89-96 in Phytotaxa 575 (1) on pages 91-94, DOI: 10.11646/phytotaxa.575.1.6, http://zenodo.org/record/740333
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
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
Effect of Alkali Treatment under Ambient and Heated Conditions on the Physicochemical, Structural, Morphological, and Thermal Properties of Calamus tenuis Cane Fibers
No full textThis study explores the effect of alkali treatment at ambient (25 °C) and elevated temperatures (100 °C) on the physicochemical, structural, morphological, and thermal properties of Calamus tenuis cane fibers (CTCFs) for the first time. Our purpose is to investigate their potential use as reinforcement in polymer composites, since cane fibers are generally known for their accurate and consistent geometrical orientation. Treatment with 8% (w/v) sodium hydroxide (NaOH) is carried out at ambient temperature and at 100 °C for 4 h. Chemical analysis and Fourier transform IR spectroscopy (FTIR) indicate some removal of non-cellulosic elements from CTCFs during alkali treatment, resulting in increased surface roughness, as confirmed by using SEM micrographs. This removal of non-cellulosic elements leads to an enhancement in the density of the treated CTCFs. Untreated and treated fibers are analyzed for maximum degradation temperature, thermal stability, and kinetic activation energy (Ea) using thermogravimetric analysis (TGA). In particular, Ea was considerably diminished with treatment and temperature. X-ray diffraction (XRD) results show an improved crystallinity index (37.38% to 44.02%) and crystallite size (2.73 nm to 2.98 nm) for fibers treated with 8% NaOH at ambient temperature. In conclusion, a general benefit was achieved by treating CTCFs, though the influence of increasing temperature treatment appears controversial
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