1,720,978 research outputs found
Trisetum spicatum (Poaceae: Pooideae): an interglacial relict in the Iranian mountains
No full textTalebi, Amir, Naqinezhad, Alireza, Attar, Farideh (2022): Trisetum spicatum (Poaceae: Pooideae): an interglacial relict in the Iranian mountains. Phytotaxa 532 (1): 85-92, DOI: 10.11646/phytotaxa.532.1.
FIGURE 1. A in Trisetum spicatum (Poaceae: Pooideae): an interglacial relict in the Iranian mountains
No full textFIGURE 1. A. Herbarium specimen of Trisetum spicatum. B. Peduncle. C. Spikelet. D. Lemma. E. Palea. (based on A. Talebi 48424). (Photography by: Talebi)Published as part of Talebi, Amir, Naqinezhad, Alireza & Attar, Farideh, 2022, Trisetum spicatum (Poaceae: Pooideae): an interglacial relict in the Iranian mountains, pp. 85-92 in Phytotaxa 532 (1) on page 86, DOI: 10.11646/phytotaxa.532.1.7, http://zenodo.org/record/590094
FIGURE3 in Trisetum spicatum (Poaceae: Pooideae): an interglacial relict in the Iranian mountains
No full textFIGURE3. Scree habitats of Trisetum spicatum in Damavand Mt., Iran.Published as part of Talebi, Amir, Naqinezhad, Alireza & Attar, Farideh, 2022, Trisetum spicatum (Poaceae: Pooideae): an interglacial relict in the Iranian mountains, pp. 85-92 in Phytotaxa 532 (1) on page 89, DOI: 10.11646/phytotaxa.532.1.7, http://zenodo.org/record/590094
Base metal ion extraction and stripping from WEEE leachate by liquid-liquid extraction
No full textThe simultaneous effect of different factors such as pH, carrier concentrations,
organic phase modifier, and stripping agent concentrations on the extraction and stripping
of base metals from waste electrical and electronic equipment (WEEE) leachate was
investigated. Initially, sulphuric acid and hydrogen peroxide were used in the leaching
process of base metals from WEEE, followed by an investigation on the effectiveness of
different organic phases on WEEE leachate regarding metal extraction. In this phase,
Versatic 10 (V10) and tributyl phosphate (TBP) were used as carrier and phase modifier,
respectively, while kerosene was used as the organic phase diluent. Extractions of silver,
copper, cadmium, nickel, iron, lead, zinc and aluminium were achieved using 150 mm of
V10, loaded with 100 mm of TBP in kerosene. Eventually, a study on extracted metals
stripping was carried out to optimise the highest base metal stripping from the organic
phase. For this purpose, different concentrations of sulfuric acid were used as stripping
agent, and the results revealed that 1.5 M of H2SO4 successfully stripped the extracted
metal ions
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
Trisetum spicatum K. Richter 1890
No full text<i>Trisetum spicatum</i> (Linnaeus 1753: 64) K. Richter (1890: 59). <p> Basionym: <i>Aira spicata</i> Linnaeus (1753: 64).</p> <p> Synonym: <i>Avena subspicata</i> Linnaeus (1759: 873).</p> Description <p>Perennial, caespitose, culms up to 20 cm high, densely tufted, erect, or geniculately ascending, totally covered with sparse to dense hairs (densely tomentose below the inflorescence), hairs retrorse, spreading, or horizontal in upper parts. Leaf sheath and blade sparsely tomentose, leaf blade flat or convolute, -8.0 cm × 1.0–2.0 mm, hirsute, leaf sheath membranous on margin, ligule 1.0–2.0 mm long, obtuse and irregularly laciniate. Peduncle 1.0 mm wide, with dense intricate and retrorse hair (up to 0.7 mm long), mostly retrorse. Inflorescence a panicle, dense, linear to ovate, 2.0–6.0 × 0.5–1.0 cm, interrupted in lower part (slightly loose at base), branches appressed pubescent throughout the panicle. Floret callus pubescent. Spikelet laterally compressed, up to 5.0 mm (9.0 mm including an awn), with 2 (3) florets, rhachilla internodes pubescent, glumes persistent, membranous, subequal, lower glume 3.0–4.0 mm, upper glume 4.0–5.0 mm, glume apex acute, keel scaberulous, lemma 4 mm, membranous, keeled, glabrous, or puberulous, dentate (2 -fid) at apex, 0.5-0.7 mm, awned from upper 1/3, awn 3.0–4.0 mm, geniculate, Palea keel scaberulous. Anther 3, ca.1.0 mm long. Ovary glabrous.</p> <p> <b>Specimens examined:—</b> IRAN. Mazandaran Province, Damavand Mt., 4070 m a.s.l, 35˚55’ 42.6ʺN, 52˚08’ 03.7ʺ E, 8/17/2011, <i>Talebi</i> 68424 (TUH)</p> <p> <b>Chromosome number:—</b> 2n=28, 42 (Randal & Hilu 1986, Dawson 2000)</p>Published as part of <i>Talebi, Amir, Naqinezhad, Alireza & Attar, Farideh, 2022, Trisetum spicatum (Poaceae: Pooideae): an interglacial relict in the Iranian mountains, pp. 85-92 in Phytotaxa 532 (1)</i> on page 87, DOI: 10.11646/phytotaxa.532.1.7, <a href="http://zenodo.org/record/5900940">http://zenodo.org/record/5900940</a>
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
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