1,721,924 research outputs found
Begonia intermedia, a new species of Begoniaceae from Hainan, China
No full textTian, Dai-Ke, Li, Chun, Yan, Yue-Hong, Li, Xiang-Peng, Meng, Jing, Dc, A. (2014): Begonia intermedia, a new species of Begoniaceae from Hainan, China. Phytotaxa 166 (2): 114-122, DOI: 10.11646/phytotaxa.166.2.2, URL: http://dx.doi.org/10.11646/phytotaxa.166.2.
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
FIGURE 2. A in Huperzia nanlingensis (Lycopodiaceae), a new terrestrial firmoss from southern China
No full textFIGURE 2. A.Typical habit of H. nanlingensis. B. Upper branches showing leaves and sporangia of H. nanlingensis. C. Upper branches showing leaves and sporangia of H. serrata.Published as part of Shrestha, Nawal, Xing, Fu-Wu, Qi, Xin-Ping, Yan, Yue-Hong & Zhang, Xian-Chun, 2014, Huperzia nanlingensis (Lycopodiaceae), a new terrestrial firmoss from southern China, pp. 73-79 in Phytotaxa 173 (1) on page 75, DOI: 10.11646/phytotaxa.173.1.6, http://zenodo.org/record/514282
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
FIGURE 3 in Sphaeropteris guangxiensis Y. F. Gu & Y. H. Yan (Cyatheaceae), a new species of tree fern from Southern China
No full textFIGURE 3. Fiddleheads and sori on pinnule segments.—A & D. Sphaeropteris brunoniana.—B & E. S. guangxiensis.—C & F. S. hainanensis.Published as part of Gu, Yu-Feng, Jiang, Ri-Hong, Liu, Bao-Dong & Yan, Yue-Hong, 2021, Sphaeropteris guangxiensis Y. F. Gu & Y. H. Yan (Cyatheaceae), a new species of tree fern from Southern China, pp. 69-74 in Phytotaxa 518 (1) on page 72, DOI: 10.11646/phytotaxa.518.1.8, http://zenodo.org/record/544801
YU-FENG GU, MORIGENGAOWA, RI-HONG JIANG, BAO-DONG LIU & YUE-HONG YAN (2021) Sphaeropteris guangxiensis Y. F. Gu & Y. H. Yan (Cyatheaceae), a new species of tree fern from Southern China. Phytotaxa 518 (1): 69-74.
No full textYu-Feng Gu, Morigengaowa, Ri-Hong Jiang, Bao-Dong Liu (2021): YU-FENG GU, MORIGENGAOWA, RI-HONG JIANG, BAO-DONG LIU & YUE-HONG YAN (2021) Sphaeropteris guangxiensis Y. F. Gu & Y. H. Yan (Cyatheaceae), a new species of tree fern from Southern China. Phytotaxa 518 (1): 69-74. Phytotaxa 520 (1): 116-116, DOI: https://doi.org/10.11646/phytotaxa.520.1.10, URL: http://dx.doi.org/10.11646/phytotaxa.520.1.1
顺丁橡胶聚合过程的微观质量数学模型
No full textMicro-quality mathematical model Caoliu Lin butadiene rubber polymerization process, Yue Hong (Beijing Institute of Chemical Technology Department of Automation, Beijing, 100029) Abstract This paper introduces the multi-reactor continuous polymerization butadiene rubber production process as an object, from the polymerization mechanism and the actual working conditions departure, a mathematical model to describe the microscopic polymer quality. Catalytic system model including active centers exist in the dual assumption to Throckmorton three model-based metal active centers established; polymerization process using reactive degree method and technology to build the generating function of the macro-and micro-kinetic equation and the molecular weight and its distribution model. The article also describes some of the results of the use of simulation technology to validate the model. Keywords together a diene; mathematical model; microscopic quality; dual active centers due DOI: Blade back nine camel; O242 Introduction As we all know, the quality of the product is polymerized by its basic molecular parameters of the decision. On butadiene rubber, this parameter is divided on the amount and distribution, education and gel content, such as "', and these parameters had to be affected by the light in the polymerization process operating variables, and currently there is no online testing these quality index means and tools, so companies commonly Mooney amount as the monitoring indicators, but Mooney does not characterize all of the information before microscopic degrees of quality, making it difficult to ensure the quality of the end produc
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