1,722,479 research outputs found
Petrocosmea panzhouensis (Gesneriaceae), a new species from Guizhou, China
No full textTang, Sheng-Hu, Zhang, Jian-Hua, Peng, Tao, Guo, Ying (2022): Petrocosmea panzhouensis (Gesneriaceae), a new species from Guizhou, China. Phytotaxa 572 (3): 225-231, DOI: 10.11646/phytotaxa.572.3.1, URL: http://dx.doi.org/10.11646/phytotaxa.572.3.
FIGURE 3 in Petrocosmea panzhouensis (Gesneriaceae), a new species from Guizhou, China
No full textFIGURE 3. Holotype of Petrocosmea henryi Craib stored in E (Henry 9154, E00396425), and enlarged flowers (inset) from this specimen, showing its anthers.Published as part of Tang, Sheng-Hu, Zhang, Jian-Hua, Peng, Tao & Guo, Ying, 2022, Petrocosmea panzhouensis (Gesneriaceae), a new species from Guizhou, China, pp. 225-231 in Phytotaxa 572 (3) on page 229, DOI: 10.11646/phytotaxa.572.3.1, http://zenodo.org/record/732217
Perfluorinated phthalocyanines for optical limiting: Evidence for the direct correlation between substituent electron withdrawing character and the nonlinear optical effect
No full textA study was conducted on the optical limiting effect of the hexadecafluorophthalocyanines F 16PcTiO(1), F 16PcVO(2), F 16PcZr(OH) 2(3), and F 16PcInCl(4) and compared with the optical limiting effect produced by analogous systems bearing different kinds of substituents. It was found that the presence of electron-withdrawing substituents, namely fluoro, in the phthalocyanine brings about a noticeable improvement of the optical limiting effect in these systems. Such an improvement was attributed to the augmentation of the transition dipole moment associated with the excited states involved in the electronic transition responsible for the optical limiting effect
FIGURE 2 in Petrocosmea panzhouensis (Gesneriaceae), a new species from Guizhou, China
No full textFIGURE 2. Habitats of Petrocosmea panzhouensis Sheng H.Tang & Tao Peng, sp. nov. A type locality of P. panzhouensis, growing inside the cave B, C landscape of Niangniang Mountain D, E, F P. panzhouensis in the cave at the the type locality. (Photographs by Sheng-Hu Tang).Published as part of Tang, Sheng-Hu, Zhang, Jian-Hua, Peng, Tao & Guo, Ying, 2022, Petrocosmea panzhouensis (Gesneriaceae), a new species from Guizhou, China, pp. 225-231 in Phytotaxa 572 (3) on page 228, DOI: 10.11646/phytotaxa.572.3.1, http://zenodo.org/record/732217
FIGURE 3 in Two new Mycena (Mycenaceae, Agaricales) species with rhizomorphs from subtropical areas of China
No full textFIGURE 3. Morphological features of M. chlorocyanea. a. basidiomata; b. basidia; c. basidiospores; d. cheilocystidia; e. pileipellis; f. caulocystidia. Scale bars: a=5mm, c=5μm, b, e–f=10μm. Drawings by: Li-na Liu.Published as part of Liu, Li-Na, Zhou, Guo-Ying, Tan, Zhu-Ming & Tian, Yong-Xiang, 2022, Two new Mycena (Mycenaceae, Agaricales) species with rhizomorphs from subtropical areas of China, pp. 75-88 in Phytotaxa 576 (1) on page 81, DOI: 10.11646/phytotaxa.576.1.4, http://zenodo.org/record/744100
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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