1,721,359 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
Lysimachia rupestris F. H. Chen & C. M. Hu 1979
No full textLysimachia rupestris F. H. Chen & C. M. Hu (Fig. 1) In Acta Phytotaxonomica Sinica 17 (4): 40 (1979). SPECIMEN DATA. — Vietnam. Ha Long Bay, Quang Ninh, 20°48’6.56”N, 106°59’40.51”E, alt. 163 m, on rocks at the top of limestone hills, 29.IV.2015, Nian He Xia, Viet Lam Le & Duy Hung Vuong, s.n . (IBSC, two duplicates). DESCRIPTION Herbs perennial, 2-5 cm tall, glabrous throughout. Stems copiously minutely glandular; stolons 2- many, 6-17 cm long, arising from leaf rosette, leafy at apex. Leaves spirally arranged, ± forming a rosette; petiole 1-2 cm long, narrowly winged; leaf blade elliptic-oblanceolate, 3-6.5 × 1.2-2.2 cm, minutely glandular on both sides, base long attenuate, margin narrowly revolute, apex acute to obtuse; veins 3 or 4 pairs, prominent abaxially; veinlets invisible. Flowers solitary, axillary. Pedicel 2.5-4 cm long, densely minutely glandular. Calyx c. 1 cm long, divided to base, lobes lanceolate, c. 1 cm × 1.5-2 mm, densely minutely glandular, especially so at the base, with 1 midvein, reticulate veins inconspicuous. Corolla yellow, divided near to base, lobes oblong-lanceolate, 7-8 mm × c. 2 mm, apex acute to obtuse, glabrous. Stamens 5, filaments c. 1 mm long, connate basally into a ring, free parts c. 0.7 mm long; anthers 4-5 mm, basifixed, opening by apical pores. Style c. 6 mm long, glabrous; stigma punctate, ovary subglobose, glabrous. Capsule subglobose, c. 4 mm in diam. Flowering April-May, fruiting May-August. REMARKS Because of the similar vegetative appearance, Chen & Hu (1979) assigned Lysimachia rupestris together with L. alpestris Champ. ex Benth. to subgenus Lysimachia section Rosulatae R. Knuth only according to the flower characters of L. alpestris, i.e. the dorsifixed anthers opening by lateral slits, which is an important feature of subgenus Lysimachia, although it also has short filaments connate basally into a very short ring and does not bear colored glands, which are the features of subgenus Idiophyton Hand.-Mazz. Bennell & Hu (1983) suggested that subgenus Lysimachia section Rosulatae could be derived directly from subgenus Idiophyton section Apodanthera based on pollen morphology. Recent phylogenetic research confirmed that section Rosulatae is more close to subgenus Idiophyton, rather than subgenus Lysimachia (Hao et al. 2004; Anderberg et al. 2007). Our supplement of the floral characters, especially the basifixed anthers opening by apical pores (Fig. 1F) of L. rupestris is another strong evidence to support that section Rosulatae should be transferred to subgenus Idiophyton. The third species with the spirally aggregated leaves forming nearly rosettes is the recently described L. verbascifolia (Phan & Hu 2011). This species also has basifixed anthers opening by apical pores, which shows its affinity of L. rupestis. However, the lack of stolons in L. verbascifolia adds confusion to the relationship between these species. Thus, there is still much work to do to figure out their systematic position.Published as part of Tong, Yi-Hua, Xia, Nian-He & Lam, Le Viet, 2017, Lysimachia rupestris F. H. Chen & C. M. Hu (Primulaceae): a new record for the flora of Vietnam and reconsideration of its taxonomical position, pp. 125-128 in Adansonia 39 (2) on page 126, DOI: 10.5252/a2017n2a3, http://zenodo.org/record/459911
Lysimachia rupestris F. H. Chen & C. M. Hu (Primulaceae): a new record for the flora of Vietnam and reconsideration of its taxonomical position
No full textTong, Yi-Hua, Xia, Nian-He, Lam, Le Viet (2017): Lysimachia rupestris F. H. Chen & C. M. Hu (Primulaceae): a new record for the flora of Vietnam and reconsideration of its taxonomical position. Adansonia 39 (2): 125-128, DOI: 10.5252/a2017n2a
Characterization and phylogenetic analysis of the complete chloroplast genome of Carpesium longifolium F. H. Chen & C. M. Hu (Asteraceae, Inuleae)
No full textIn this study, we studied the complete chloroplast (cp) genome of Carpesium longifolium F. H. Chen & C. M. Hu 1974. The results indicated that the cp genome had a typical circular structure of 151,260 bp in length. A total of 127 genes were identified, including 36 tRNA genes, 8 rRNA genes and 83 protein-coding genes, with the GC content of 37.7%. Phylogenetic analysis revealed the systematic position of C. longifolium is sister to C. cernuum and C. faberi. For the identification and phylogenetics study of the genus, the chloroplast genome sequence of C. longifolium provides a useful genetic resource
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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