1,720,976 research outputs found
Lectotypification of Carex buekii (Cyperaceae)
No full textJiménez-Mejías, Pedro, Martinetto, Edoardo, Esser, Hans-Joachim, Soldano, Adriano (2014): Lectotypification of Carex buekii (Cyperaceae). Phytotaxa 188 (4): 238-240, DOI: 10.11646/phytotaxa.188.4.7, URL: http://dx.doi.org/10.11646/phytotaxa.188.4.
Carex buekii Wimmer 1852
No full textCarex buekii Wimmer (1852: 83) Lectotype (designated here):— POLAND. ‘l. pr. Wratislau e manu Wimmer!. s. d., J. N. Buek s.n.’ (M 0124780!; isolectotypes B 10 0218382!, JE s.n. (two sheets)!).Published as part of Jiménez-Mejías, Pedro, Martinetto, Edoardo, Esser, Hans-Joachim & Soldano, Adriano, 2014, Lectotypification of Carex buekii (Cyperaceae), pp. 238-240 in Phytotaxa 188 (4) on page 239, DOI: 10.11646/phytotaxa.188.4.7, http://zenodo.org/record/514747
FIGURE 1 in Lectotypification of Carex buekii (Cyperaceae)
No full textFIGURE 1. Handwritten label of the specimen housed at B (10 0218382) from J.N. Buek's exsiccatae proposed as Carex buekii Wimmer (isolectotype). Image taken from the Berlin virtual herbarium (Röpert 2000+, continuously updated; stable identifier http://herbarium. bgbm.org/object/B100218382).Published as part of Jiménez-Mejías, Pedro, Martinetto, Edoardo, Esser, Hans-Joachim & Soldano, Adriano, 2014, Lectotypification of Carex buekii (Cyperaceae), pp. 238-240 in Phytotaxa 188 (4) on page 239, DOI: 10.11646/phytotaxa.188.4.7, http://zenodo.org/record/514747
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
Botanical memory: five centuries of floristic changes revealed by a Renaissance herbarium (Ulisse Aldrovandi, 1551–1586)
Full text linkWe analysed the spatially explicit floristic information available in the herbarium of Ulisse Aldrovandi (1551–1586) to track floristic changes in the surroundings of Bologna across five centuries. Aldrovandi's data were compared with the Flora della Provincia di Bologna by Girolamo Cocconi (1883) and the Floristic Database of Emilia-Romagna (1965–2021). We explored potential variations in native range and life forms composition, and habitat affinity of the species in the three floras, also contrasting between native and alien species. Native species, mainly in terms of variations of hydro-hygrophytes, chamaephytes and therophytes, provide clear signals of human disturbance and habitat loss. Signals of climate change are provided by the high-mountain species, that were comparably rare between Aldrovandi and current flora and more represented in Cocconi, probably reflecting the effect of the Little Ice Age. Our findings also indicate the increasing importance of alien species from the Renaissance onwards. In this perspective, Aldrovandi's herbarium preserves the memory of the first signs of a radical transformation of the European flora and habitats. Finally, the study warns about the risk of dismissing herbaria and herbarium specimens collection, which would cause irreparable lacunas in our botanical memory, hindering our ability to predict biodiversity trajectories
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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