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FIGURE 6 in Taxonomic remarks on the Centaurea aeolica (Asteraceae) species complex
No full textFIGURE 6. Phenological features of Centaurea phalacrica. A. Natural habitat. B. Basal leaves. C. Capitulum. D. Habit. (Photos by S. Cambria).Published as part of Brullo, Salvatore, Cambria, Salvatore, Crisafulli, Alessandro, Tavilla, Gianmarco & Sciandrello, Saverio, 2021, Taxonomic remarks on the Centaurea aeolica (Asteraceae) species complex, pp. 9-24 in Phytotaxa 483 (1) on page 17, DOI: 10.11646/phytotaxa.483.1.2, http://zenodo.org/record/541962
FIGURE 3. Centaurea phalacrica. A. Habit. B. Capitulum. C in Taxonomic remarks on the Centaurea aeolica (Asteraceae) species complex
No full textFIGURE 3. Centaurea phalacrica. A. Habit. B. Capitulum. C. Appendages of the phyllaries. D. Ray sterile floret. E. Disc fertile florets. F. Stamen. G. Stygma. H. Achenes with pappus. Illustration by S. Brullo based on living material coming from type locality collected by Tavilla (CAT!).Published as part of Brullo, Salvatore, Cambria, Salvatore, Crisafulli, Alessandro, Tavilla, Gianmarco & Sciandrello, Saverio, 2021, Taxonomic remarks on the Centaurea aeolica (Asteraceae) species complex, pp. 9-24 in Phytotaxa 483 (1) on page 14, DOI: 10.11646/phytotaxa.483.1.2, http://zenodo.org/record/541962
FIGURE 3. Centaurea phalacrica. A. Habit. B. Capitulum. C in Taxonomic remarks on the Centaurea aeolica (Asteraceae) species complex
No full textFIGURE 3. Centaurea phalacrica. A. Habit. B. Capitulum. C. Appendages of the phyllaries. D. Ray sterile floret. E. Disc fertile florets. F. Stamen. G. Stygma. H. Achenes with pappus. Illustration by S. Brullo based on living material coming from type locality collected by Tavilla (CAT!).Published as part of Brullo, Salvatore, Cambria, Salvatore, Crisafulli, Alessandro, Tavilla, Gianmarco & Sciandrello, Saverio, 2021, Taxonomic remarks on the Centaurea aeolica (Asteraceae) species complex, pp. 9-24 in Phytotaxa 483 (1) on page 14, DOI: 10.11646/phytotaxa.483.1.2, http://zenodo.org/record/541962
Centaurea aeolica Gussone ex Lojacono 1903
No full textKey to the species of the Centaurea aeolica group 1. Basal leaves usually lyrate, with lacinia apex obtuse to rounded, phyllaries pale brown with blackish apex, with 1 to 2–5 teeth............................................................................................................................................................................................ C. pandataria – Basal leaves 1–2-pinnatisect, never lyrate, with lacinia apex acute, phyllaries whitish to straw-coloured, with 7–15 teeth or fimbriae...............................................................................................................................................................................................2 2. Tomentum greenish-grey, leaves 1–2-pinnatisect, with laciniae loosely inserted, phyllaries 7-nerved, appendages denticulate with teeth 0.05–0.3 mm long....................................................................................................................................................... C. aeolica – Tomentum whitish-grey, leaves 1-pinnatisect (rarely 2-pinnatisect), with laciniae densely inserted, phyllaries 5-nerved, appendages fimbriate with fimbriae up to 1.5 mm long................................................................................................................... C. phalacricaPublished as part of Brullo, Salvatore, Cambria, Salvatore, Crisafulli, Alessandro, Tavilla, Gianmarco & Sciandrello, Saverio, 2021, Taxonomic remarks on the Centaurea aeolica (Asteraceae) species complex, pp. 9-24 in Phytotaxa 483 (1) on page 21, DOI: 10.11646/phytotaxa.483.1.2, http://zenodo.org/record/541962
Sliding Dynamics of Parallel Graphene Sheets: Effect of Geometry and Van Der Waals Interactions on Nano-Spring Behavior
Get PDFGraphene and carbon nanotubes are promising materials for nanoelectromechanical systems. Among other aspects, a proper understanding of the sliding dynamics of parallel graphene sheets or concentric nanotubes is of crucial importance for the design of nano-springs. Here, we analytically investigate the sliding dynamics between two parallel, rigid graphene sheets. In particular, the analysis focuses on configurations in which the distance between the sheets is kept constant and lower than the equilibrium interlayer spacing of graphite (unstable configurations). The aim is to understand how the interlayer force due to van der Waals interactions along the sliding direction changes with the geometrical characteristics of the configuration, namely size and interlayer spacing. Results show metastable equilibrium positions with completely faced sheets, namely a null force along the sliding direction, whereas net negative/positive forces arise when the sheets are approaching/leaving each other. This behavior resembles a molecular spring, being able to convert kinetic into potential energy (van der Waals potential), and viceversa. The amplitude of both storable energy and entrance/exit forces is found to be proportional to the sheet size, and inversely proportional to their interlayer spacing. This model could also be generalized to describe the behavior of configurations made of concentric carbon nanotubes, therefore allowing a rational design of some elements of carbon-based nanoelectromechanical systems
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
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
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