131,704 research outputs found
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Geophis fulvoguttatus Mertens
No full text17. Geophis fulvoguttatus Mertens Geophis fulvoguttatus Mertens 1952 a: 134. Holotype. Senckenberg Forschungsinstitut und Naturmuseum (SMF) 43248, juvenile male collected August 1951 by A Zilch. Typelocality. Hacienda Monte Cristo, 2200 m elevation, Cordillera Metapán, Santa Ana, El Salvador. Distribution. Known from 16802200 m elevation in Santa Ana, El Salvador, and Ocotepeque and Copán, Honduras. Species group. dubius (Downs 1967). Systematic references. Mertens (1952 a, b), Downs (1967), McCranie & Wilson (1991), Townsend (2006).Published as part of Wilson, Larry David & Townsend, Josiah H., 2007, A checklist and key to the snakes of the genus Geophis (Squamata: Colubridae: Dipsadinae), with commentary on distribution and conservation, pp. 1-31 in Zootaxa 1395 on page 10, DOI: 10.5281/zenodo.27368
Pangshura tentoria subsp. circumdata Mertens 1969
No full textPangshura tentoria circumdata Mertens 1969:24 Holotype: SMF 52793 (photographed in the original description, p. 26. Fig. 1); paratypes (11), SMF 47847, 51067, 51569-71, 58084, 61209, 65292, and 3 uncatalogued specimens (Das 2009:5). Pangshura tentoria flaviventer (Günther 1864:35) Holotype: BMNH 1947.3.4.82 (formerly 1880.1.28.8; Das 2009:3).Published as part of Iverson, John B., 2022, A review of Chelonian type specimens (order Testudines), pp. 1-85 in Megataxa 7 (1) on page 30, DOI: 10.11646/megataxa.7.1.1, http://zenodo.org/record/596444
Turby - sustainable urban wind power from the roof top
No full textIf current trends are anything to go by, in future we will no longer produce all our electricity in large, central power stations. Small-scale local electricity generation will gain in importance. Sander Mertens, a post-doctoral student at TU Delft, developed the aerodynamic design of a wind turbine which is specifically suitable for built-up areas. Compact, mobile, low-noise, and vibration-free, it is the ideal alternative for use on top of high-rise office blocks, where wind speeds can easily reach twenty percent more than with the same height away from buildings. The electricity can be fed straight into the buildings power system, saving on energy transport costs and losses, and producing high feed-in yields. Prototypes have already been installed on the town hall in The Hague (designed by Richard Meier), on an apartment block in Tilburg, on an office block in Breda, and on top of the Delft ChemTech faculty building. Interest has been generated in London and Leicester in the UK, New Mexico and New York in the USA, and in France and Canada
The key role of soil microbes
No full textThe key role of soil microbes (W. Verstraete, B. Mertens). 6. The use of soil invertebrates in ecological surveys of contaminated soils (N.M. van Straalen). 7. Balance and stability in vital soils (P.C. de Ruiter). 8. Soil and higher organisms: from bottom-up relations to top-down monitoring (N.W. van den Brink)
Bairdoppilata pseudoseptentrionalis Mertens 1956
No full textBairdoppilata pseudoseptentrionalis Mertens, 1956 Fig. 5L Bairdoppilata pseudoseptentrionalis Mertens, 1956: 182, figs 8.7–8.10, 13.89–13.90. Bairdoppilata pseudoseptentrionalis – Howe & Laurencich 1958: 82, unnumbered figs. — Weaver 1982: 24, figs 4.1–4.3. —?Jarvis et al. 1988: 34, fig. 15j. Cytherina subdeltoidea Münster, 1830 –? Roemer 1841: 105, fig. 16.22. — ? Reuss 1845: 54, fig. 5.38. Cythere (Bairdia) subdeltoidea – Jones 1849 pars: 23, fig. 5.15a–c, e–f. Bairdia subdeltoidea –? Jones & Hinde 1890: 5, figs 2.31–2.34. Bairdia pseudoseptentrionalis – Oertli 1963: pl. 72, pl. 73, fig. l, pl. 76. —? Kaye 1965: 223, figs 2.1, 2.3–2.6. —? Gründel 1966: 15, fig. 1.18. —? Keen & Siddiqui 1971: 63, fig. 1.2. — Hart 1973: 281, fig. 4. —? Babinot et al. 1985a: 172, fig. 5l. 1. Bairdia sp. – Majoran 1989: 9, figs 2.5–2.7. Bairdoppilata sp. 1 – Piovesan et al. 2013: 244, fig. 3.8a–b. non Cythere (Bairdia) subdeltoidea – Jones 1849 pars: 23, fig. 5.15d. non Bairdia pseudoseptentrionalis – El-Nady et al. 2008: 544, fig. 2.6. non Bairdia gr. pseudoseptentrionalis – Babinot et al. 1985b: 224, figs 55.15–55.16. New material examined BRAZIL: P384 outcrop, Riachuelo Municipality, Sergipe State (MP-1509 to MP-1513), approximate coordinates 10°43' S, 37°12' W; Porto dos Barcos 3 outcrop, Riachuelo Municipality, Sergipe State (samples MP-1460, MP-1468 and MP-1469), approximate coordinates 10°43' S, 37°10' W; São José 1 outcrop, Riachuelo Municipality, Sergipe State (samples MP-1574, MP-1680 and MP-1697), approximate coordinates 10°44' S, 37°13' W. Type locality and stratum 194 well, Dalum oil field, Germany; Lower Chalk Group, upper Albian. Measurements Homeotype (CP-676): carapace: length = 0.91 mm, height = 0.58 mm, width = 0.44 mm. Homeotype (CP-677): left valve: length = 0.91 mm, height = 0.55 mm. Remarks The diagnosis follows Mertens (1956). Historically, Bairdoppilata pseudoseptentrionalis Mertens, 1956 has been mistaken for B. subdeltoidea (Münster, 1830), as the former species has never been adequately illustrated since its description by Münster (1830). Several sub-species were added to Bairdoppilata subdeltoidea during the 19 th century, which increases the difficulties in establishing its current taxonomic status. The most recent review of the species is in Deroo (1956), who renamed it as Bairdoppilata roemeri, with a lower Cretaceous–Tertiary stratigraphic range. Assuming the species is still valid, it has to be separated from Bairdoppilata pseudoseptentrionalis, at least in terms of age; the former is considered later Cretaceous–Tertiary (Münster 1830), while the latter is from the late Albian– Cenomanian (Mertens 1956). The specimens in Kaye (1965), Gründel (1966) and Jarvis et al. (1988) present a straighter posterior portion of the dorsal margin in the left valve, when compared to the more rounded one in B. pseudoseptentrionalis. In Keen & Siddiqui (1971) and Babinot et al. (1985b), the specimens presents a generally wider overlapping and less rounded overall shape. Paleoecology and distribution Bairdoppilata pseudoseptentrionalis is a shelf to neritic marine species occurring in the following localities and stages: Anglo-Paris Basin, France, middle Albian (Oertli 1963); Lower Chalk Group, Germany, Albian–Cenomanian (Mertens 1956); Gault, Greensand and Holywell Nodular Chalk (including Plenus Marl Member) Formations, Anglo-Paris Basin, England, Albian–Cenomanian (Jones 1849; Hart 1973; Weaver 1982); Bordj Ghdir Basin, Algeria, lower Cenomanian (Majoran 1989); Florianópolis and Guarujá Formation, Santos Basin, upper Aptian–middle Albian (Piovesan et al. 2013); and in the present work, Angico and Taquari Members, Riachuelo Formation, Sergipe-Alagoas Basin, uppermost Aptian–middle Albian, Aracajuia benderi zone (MSA-0), Sergipella viviersae (MSA-0.2) and Praebythoceratina amsittenensis (MSA-0.3) subzones, Brazil.Published as part of Antonietto, Lucas Silveira, Carmo, Dermeval Aparecido do, Viviers, Marta Claudia, Neto, João Villar Queiroz & Hunt, Gene, 2016, Ostracoda (Arthropoda, Crustacea) from the Riachuelo Formation, Sergipe-Alagoas Basin, Brazil, Upper Aptian-Albian, pp. 1-57 in European Journal of Taxonomy 244 on pages 14-15, DOI: 10.5852/ejt.2016.244, http://zenodo.org/record/385062
Olaf B. Rader (dir).Turbata per aequora mundi. Dankesgabe an Eckhard Müller-Mertens, Hannover, Hahnsche Buchhandlung, 2001
No full textCompte rendu de l'ouvrage Turbata per aequora mundi. Dankesgabe an Eckhard Müller-Mertens, dir. Olaf B. Rader, Hannover, Hahnsche Buchhandlung, 2001. Compte rendu paru dans Francia, n° 30/1, p. 255-258
Kaarten op tafel! Bevraging omtrent sociale kaarten in Vlaanderen en Brussel: een voorstel voor een nieuwe aanpak
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