187,494 research outputs found
Hornestheria Kozur et Lepper
No full textGenus Hornestheria Kozur et Lepper in Kozur et Weems, 2010 Type species. Hornestheria sollingensis Kozur et Lepper (in Kozur & Weems, 2010); from the Frohrieper Berg Quarry (East of the town of Lauenförde, Lower Saxony, Germany), Solling Formation (Middle Buntsandstein Subgroup, Buntsandstein Group), uppermost Spathian (uppermost Olenekian, uppermost Lower Triassic) (Kozur & Weems 2010: p. 395). Hornestheria sollingensis was used in stratigraphic charts (e.g., Bachmann & Kozur 2004) before the taxonomic characteristics for its genus and species levels were formally published by Kozur & Weems (2010: appendix 1). Remarks. A diagnosis of this genus was proposed by H.W. Kozur and J. Lepper (in Kozur & Weems 2010), but metric values for total carapace valve length and height were not provided. Besides a low convexity of the carapace valves and their almost straight dorsal margin, other characteristics of Hornestheria included the location of points of maximum curvature of the anterior margin in the horizontal midline of the carapace valve and of the posterior margin below the horizontal midline (Kozur & Weems 2010). The larval carapace valve (=umbonal area of the valve free of growth lines) bore a rather enigmatic radial element, which was either “often quite distinct” (Kozur & Weems 2010: p. 395) or unrecognizable, depending on the respective preservation state of individual carapace valves. Based on the description of Hornestheria in Kozur & Weems (2010), the radial element on the larval carapace valves of Hornestheria most closely resembles that of Lioestheria Depéret et Mazeran, 1912, which has both nodular and radial sculptures on its larval carapace valves (e.g., Kozur et al. 1981). In contrast, however, the size of the larval carapace valve in adult individuals of Lioestheria is greater than 1/3 of the total carapace valve length (Holub & Kozur 1981), and this is much larger relatively than the size of the larval valve seen in the carapace of the genus Hornestheria. This difference provides a clear distinction between Hornestheria and Lioestheria sensu Holub & Kozur (1981). Prominent sculptures are also found on the larval carapace valves of the clam shrimp genus Cornia Lutkevich, 1937, which is widely distributed in the Lower Triassic (e.g., Kozur & Seidel 1983a; Kozur & Mock 1993; Tassi et al. 2013; Scholze et al. 2016). This genus is characterized by an umbonal spine with a circular base located on the larval carapace valve. The spine can be variably preserved (Kozur 1983), being either perpendicular or obliquely embedded in the sediment or being broken, due to variable deformation (e.g., sedimentary compaction) of the rock. According to the description for Hornestheria provided by Kozur & Weems (2010), the generally radial shape of its larval sculpture makes it consistently different from the circular shape of the base of the umbonal spine in Cornia. A further characteristic of Hornestheria in the sense of H.W. Kozur and J. Lepper (in Kozur & Weems 2010) is the presence of certain types of microsculpture (ornamentation) located on the growth bands of the carapace valves. The ornamentation of the genus Hornestheria was originally described as a dense, fine reticulation, which became replaced by fine, short, radial lines in the outer margins in adult individuals (Kozur & Weems 2010). However, it should be noted that the figures of H. sollingensis in Kozur & Weems (2010: fig. A2) show only indistinct reticulation. In lateral view, the carapace valves of Hornestheria are morphologically similar to Euestheria Depéret et Mazeran, 1912, and Magniestheria Kozur, 1982. However, in contrast to Hornestheria, the carapace valves of Euestheria have a more strongly convex shape with its highest convexity in the umbonal area. The highest convexity in carapace valves of Magniestheria is located in its central area. Both Euestheria and Magniestheria differ in their ornamentation from Hornestheria. The ornamentation of Euestheria is either finely dotted to weakly reticulated (Kozur & Seidel 1983a) or very finely pitted, having pits of round to round-oval shapes with diameters of about 10 μm (Sell 2018), that appear generally to be more regular and smoother than the ornamentation seen in Hornestheria. The ornamentation of Magniestheria is indistinct, varying between coarse pits and very short, irregular, radial lines (Kozur & Seidel 1983a); their expression is less intense than in Hornestheria. Occurrence. Uppermost Spathian (uppermost Olenekian; upper Lower Triassic) and Anisian (lower Middle Triassic) in Germany (Kozur & Weems 2010), China (see discussions on “ Protomonocarina ” in Kozur & Weems 2010: p. 395), and Mallorca (the present study).Published as part of Scholze, Frank & Matamales-Andreu, Rafel, 2021, Triassic clam shrimps (" Conchostraca "; Branchiopoda: Diplostraca) from Mallorca: Taxonomic description and interregional comparisons, pp. 471-496 in Zootaxa 4964 (3) on pages 475-476, DOI: 10.11646/zootaxa.4964.3.3, http://zenodo.org/record/471518
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
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
Dr. Edward P. Wimberly, ITC, July 2011
No full textThis video is a conversation with Dr. Edward P. Wimberly. Dr. Wimberly talks about his book, "No Shame in Wesley's Gospel: A Twenty-First Century Pastoral Gospel". Brad Ost, AUC Woodruff Library, is the interviewer
Author Rights and Scholarly Publishing
No full textOriginally posted at
http://blog.library.gsu.edu/2014/10/24/author-rights-and-scholarly-publishing/</p
Underwater acoustic monitoring at wave and tidal energy sites: guidance notes for regulators
No full textTo provide regulators with a greater appreciation of the key aspects of underwater acoustic data gathering. Specifically: what should be measured; how should measurement be undertaken; common pitfalls to avoid; and what to look for in an underwater acoustic data gathering and analysis report
Alpha1-antitrypsin deficiency – Diagnostic testing and disease awareness in Germany and Italy
No full textSummaryBackgroundAlpha1-antitrypsin (AAT) deficiency, although largely under-diagnosed, is the underlying cause of approximately 1% of COPD cases. Lack of awareness leads to long delays in diagnostic testing. Subsequently, lifestyle and treatment choices with potentially positive effects on prognosis may be postponed.MethodsData on the testing and diagnostic practices for AAT deficiency were derived from the University of Pavia, Italy, and the University of Marburg, Germany. In addition, a survey of physicians was undertaken to explore their awareness and attitudes toward AAT deficiency.ResultsIn Pavia and Marburg, 125 and 729 patients, respectively, were identified with severe AAT deficiency between July 2006 and June 2011. The median time interval between the onset of symptoms and diagnosis was 6 years (interquartile range [IQR], 11; range, 0–40) and 7 years (IQR, 13; range, 0–73), respectively. Augmentation therapy was initiated almost immediately in Germany while treatment was delayed by 3 months in Italy (IQR, 5.25; range, 1–118). Survey data (Italy, n = 181; Germany, n = 180) revealed that pulmonologists had greater knowledge of AAT deficiency than internists and general practitioners, however, overall, only 18–25% of physicians tested all COPD patients. One-third of the respondents stated that they “sometimes” offered augmentation therapy to patients diagnosed with AAT deficiency.ConclusionsMajor obstacles to AAT deficiency testing are physicians' attitudes and lack of understanding of the condition. A greater adherence to the guidelines that recommend diagnostic testing of all COPD patients, coupled with simpler testing protocols, may decrease delays and positively impact patient outcomes
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