1,721,052 research outputs found
FIGURE 2 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
No full textFIGURE 2. Gross sediment stratigraphies of the three cores, QARU9, QARU10 and GARK1 (see text for sediment descriptions). Note the basal sands below finely laminated diatom marl sediment in QARU9 & 10.Published as part of Flower, R.J., Keatings, K., Hamdan, M.A. & Hassan, F.A., 2013, Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt), pp. 66-80 in Phytotaxa 127 (1) on page 68, DOI: 10.11646/phytotaxa.127.1.10, http://zenodo.org/record/508549
FIGURE 31 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
No full textFIGURE 31. Size distributions for diatom valve diameters (see text). Fig. 31a: Stephanodiscus neoaegypticus sensu lato from material at 430 cm depth in core GARK1. Fig. 31b. Stephanodiscus galileensis Hakansson & Ehrlich from material at 1930 cm depth in core QARU9.Published as part of Flower, R.J., Keatings, K., Hamdan, M.A. & Hassan, F.A., 2013, Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt), pp. 66-80 in Phytotaxa 127 (1) on page 75, DOI: 10.11646/phytotaxa.127.1.10, http://zenodo.org/record/508549
FIGURE 1 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
No full textFIGURE 1. Lake Qarun situated in northern part of the Faiyum Depression, Egypt. Three terrestrial sediment core locations are shown with QARU9 and 10 on the southern shore of the lake and GARK1 in the Gharak region of south west Faiyum. Note diatomite exposures are indicated to the west and northeast of the modern lake.Published as part of Flower, R.J., Keatings, K., Hamdan, M.A. & Hassan, F.A., 2013, Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt), pp. 66-80 in Phytotaxa 127 (1) on page 67, DOI: 10.11646/phytotaxa.127.1.10, http://zenodo.org/record/508549
FIGURES 15–18. Stephanodiscus neoaegypticus v. fekrii, SEM. Fig. 15. External valve with a convex central area. Fig. 16 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
No full textFIGURES 15–18. Stephanodiscus neoaegypticus v. fekrii, SEM. Fig. 15. External valve with a convex central area. Fig. 16. Internal valve showing two rimoportulae (arrowed). Fig. 17. Detail of internal marginal zone showing fultoportulae with either three or four satellite pores. Fig. 18. Internal central area fultoportula with two satellite pores. Scale bars = 2 µm (Fig. 15), 5 µm (Fig. 16), and 1 µm (Figs 17, 18).Published as part of Flower, R.J., Keatings, K., Hamdan, M.A. & Hassan, F.A., 2013, Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt), pp. 66-80 in Phytotaxa 127 (1) on page 72, DOI: 10.11646/phytotaxa.127.1.10, http://zenodo.org/record/508549
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
FIGURES 24–30 in Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt)
No full textFIGURES 24–30. Stephanodiscus galileensis, LM. Fig. 25. External convex valve note irregular spines and sub-marginal silica ring. Fig. 25. Internal convex valve with rimoportula arrowed. Fig. 26. Detail of same valve showing central area ring of fultoportulae with two or three satellite pores. Fig. 27. External concave valve with ring of spines and raised interfascicular ribs. Fig. 28. Internal concave valve showing ring of sub-marginal fultoportulae and rimoportulae (arrowed). Fig. 29. Similar showing detail of a rimoportula, a submarginal fultoportula with two satellite pores and marginal fultoportulae. Fig. 30. Detail of a sub-marginal fultoportula with three satellite pores and surrounding domed cribra. Scale bars = 10 µm (Figs 24, 25, 27, 28), 1 µm (Figs 26, 29), and 0.5 µm (Fig. 30).Published as part of Flower, R.J., Keatings, K., Hamdan, M.A. & Hassan, F.A., 2013, Stephanodiscus Ehr. species from Holocene sediments in the Faiyum Depression (Middle Egypt), pp. 66-80 in Phytotaxa 127 (1) on page 74, DOI: 10.11646/phytotaxa.127.1.10, http://zenodo.org/record/508549
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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