131,464 research outputs found
Globicornis (Hadrotoma) ingelehmannae Háva & Damgaard 2015, sp. n.
No full textGlobicornis (Hadrotoma) ingelehmannae sp. n. (fig. 1–3) T y p e m a t e r i a l. Holotype ♂: Russia, Kaliningrad, Baltic amber inclusion (ZMUC). The type specimen are labeled with a red printed label bearing the following text: “HOLOTYPE Globicornis (Hadrotoma) ingelehmannae sp. n. Háva & Damgaard det. 2015”. D e s c r i p t i o n. Body broadly-oval (fig. 1–2), measurements (in mm): TL 2.7, EW 1.6. Head, pronotum and elytra black; head coarsely punctate, with long black erected setation; palpi entirely black; frontal median ocellus present; antenna with 10 antennomeres, antennal club with 3 antennomeres entirely black (fig. 3). Antennal fossa not visible. Eye very large, with black microsetae. Pronotum coarsely punctate as head, with long black erect setation and prominently raised side edge delineated by fine demarcation line. Scutellum triangular, black, without setation. Elytron finely coarsely punctate on humerus, finely on posterior parts, cuticle unicolorous, black without fasciae or spots. Apex of each elytron with long blackish setation. Legs black with black setation; protibia without spines. Metasternum coarsely punctate, with short black setation. Abdominal ventrites with long black setation. D i a g n o s i s. The new species belong to the genus Globicornis Latreille, 1829 subgenus Hadrotoma Erichson, 1846 according to antennae composed with 10 antennomeres, terminal antennomere triangular and flat, new species differs from the other two known amber species by the characters mentioned in the key below. The new species differs from the visually similar species Attagenus hoffeinsorum Háva, Prokop et Herrmann, 2006 and A. yantarnyi Háva et Bukejs, 2012 by the prosternum forming a “collar” under which mouthparts fit when head is retracted (fig. 5). E t y m o l o g y. Patronymic, dedicated to commemorate Dr. Inge Lehmann (1888– 1993), an excellent Danish seismologist and geophysicist.Published as part of Háva, J. & Damgaard, A. L., 2015, A New Species Of Globicornis (Hadrotoma) (Coleoptera, Dermestidae, Megatominae) From Baltic Amber, pp. 373-376 in Vestnik Zoologii 49 (4) on pages 374-375, DOI: 10.1515/vzoo-2015-0041, http://zenodo.org/record/645255
Potamobates tumaquensis Padilla-Gil & Damgaard, 2011, n. sp.
No full textPotamobates tumaquensis n. sp. Type material. HOLOTYPE, M, allotype F (all apterous): COLOMBIA, Nariño, Tumaco, Consejo Comunitario Río Mejicano, Vereda Santa Rosa, 0 m, 6 II 2009, leg. D. N. Padilla (ICN). PARATYPES, same data as holotype, all apterous, 2 M, 1 F (PSO-CZ); Nariño, Tumaco, Consejo Comunitario Río Mejicano, Vereda San José del Guayabo, 0 m, 3 II 2009, leg. D. N. Padilla, 3 M, 1 F (ICN). COLOMBIA, Nariño, La Espriella Tumaco, 2 m, 30 I 2010, leg. N. Nicola, (all apterous): 1 M (CP); Nariño, Tumaco, Consejo Comunitario Río Mejicano, Vereda Retoño, 0 m, 4 II 2009, leg. D. N. Padilla, 1 F (CP). Description. Ground color shining black; body covered with very dense, short and dark pubescence; head with triangular, yellow mark, vertex black; pronotum with wedge-shaped, yellow marking medially, propleura silver; mesonotum with posterior wedge-shaped and yellow mark medially, and pleurae with a linear, longitudinal, silverish stripe; posterolateral corners of meso- and metanotum with silvery marks; lateral margins of abdominal tergites and posterior margin of tergite VIII silvery. Genital segments black. Antennae and legs shining black; all coxae, fore trochanter, apex of middle and hind trochanters, and dorsal fore femur yellow. Venter yellow and with a black spot near to the fore coxae. Apterous male (Fig. 2). Body length 10.8; maximum width (across mesocoxae) 2.52. Length of head (1.08) more than three times narrowest interocular space (0.32); width of eye 0.68; eyes extending posteriorly 1 / 5 onto pleura. Rostrum not reaching hind margin of prosternum. Pronotum length (0.88), width (1.88). Mesonotum long (2.8) and widest across mesocoxae (2.52). Metanotum short (0.84), widest across metacoxae (2.2). Abdomen longer (2.12) than the length of the genital segments (1.84). Tergites I and VI: 0.32, tergites II–IV: 0.2, V: 0.24, VII: 0.64, and VIII 1.24. Tergite VII with angulated connexiva; tergite VIII not modified; proctiger bearing a short, thorn-like shape projection on left side (Fig. 3), terminating in a “bird-head” shape. Male terminalia as shown in Figs. 3, 4. Antennae length of segments I: 1.48, II: 0.6, III: 0.52, IV: 1.0. Anterior femur stout, tapering distally. Proportions of male legs as follows: fore femur/tibia/tarsal 1 /tarsal 2: 2.20 / 2.32 / 0.18 / 0.50; of middle leg, 9.86 / 7.33 / 2.28 / 0.62; of hind leg, 10.60 / 5.06 / 0.42 / 0.30. Apterous female. Body length 11.46, maximum width (across mesocoxae) 3.0, coloration similar to that of male. Margins of connexival segments I–V thickened, posterolateral angles of segments VI and VII slightly folded inward (Fig. 5); connexiva not produced posteriorly. Abdominal tergite VIII triangular (Fig. 5), ventrite VIII semitriangular (Fig. 6); second genital segment exposed as a cylindrical segment (Fig. 6). Ecological notes. P. tumaquensis occurs in the Tumaco Municipality (Fig. 1), situated in the Pacific lowlands (0–2 m), with high rainfall (4000–8000 mm /annum), and tropical wet forest vegetation. The species was found on a clear, flowing, water stream, occurring syntopically with Brachymetra albinervis (Amyot & Serville, 1843) at Santa Rosa; and with Telmatrometra whitei Bergroth 1908 at Guayabo and Retoño. They apparently prefer to aggregate in small groups of two or three individuals, or alone as solitary individuals, with only one large group having been found. Etymology. The name “ tumaquensis ” refers to the Colombian municipality of Tumaco, from which the types were collected. Comparative notes. P. tumaquensis is similar to P. horvathi, but the male of tumaquensis has the process of the proctiger exposed and characteristic.Published as part of Padilla-Gil, Dora N. & Damgaard, Jakob, 2011, A new species of Potamobates Champion from Colombia with a re-analysis of phylogenetic relationships (Hemiptera: Gerridae), pp. 41-49 in Zootaxa 2879 on pages 43-44, DOI: 10.5281/zenodo.20206
The effect of competition between two spatially separated markets - An investigation of two interlinked Bak-Sneppen models
No full textThis paper investigates the effect of competition in a market consisting of interlinked economic agents. In particular, the effect of increased competition from the surrounding markets is demonstrated. The presented work is an extension of the Bak-Sneppen model (Bak and Sneppen 1993). Here are two Bak-Sneppen models interlinked such that if the lowest fitness value of one market exceeds the fitness values of the other market minus transportation cost, all cells lower than this band will receive a new random value. The model shows that interdependency between markets has a strong effect on the competitiveness of the least competitive market. The external competition is able to make the least competitive market perform better as well as worse than on its own.Bak-Sneppen model, interdependency, competition, Marketing,
MeSH term explosion and author rank improve expert recommendations
No full textInformation overload is an often-cited phenomenon that reduces the productivity, efficiency and efficacy of scientists. One challenge for scientists is to find appropriate collaborators in their research. The literature describes various solutions to the problem of expertise location, but most current approaches do not appear to be very suitable for expert recommendations in biomedical research. In this study, we present the development and initial evaluation of a vector space model-based algorithm to calculate researcher similarity using four inputs: 1) MeSH terms of publications; 2) MeSH terms and author rank; 3) exploded MeSH terms; and 4) exploded MeSH terms and author rank. We developed and evaluated the algorithm using a data set of 17,525 authors and their 22,542 papers. On average, our algorithms correctly predicted 2.5 of the top 5/10 coauthors of individual scientists. Exploded MeSH and author rank outperformed all other algorithms in accuracy, followed closely by MeSH and author rank. Our results show that the accuracy of MeSH term-based matching can be enhanced with other metadata such as author rank
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
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
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
Scholarly Communication and Publishing Lunch and Learn Talk #11: The ULS Open Access Author Fee Fund
No full textAt the May 2014 talk, you will learn about the ULS Open Access Author Fee Fund--what it is, why we do it, how it works, and how the program is going so far
The solution of a chiral random matrix model with complex eigenvalues
No full textWe describe in detail the solution of the extension of the chiral Gaussian unitary ensemble (chGUE) into the complex plane. The correlation functions of the model are first calculated for a finite number of N complex eigenvalues, where we exploit the existence of orthogonal Laguerre polynomials in the complex plane. When taking the large-N limit we derive new correlation functions in the case of weak and strong non-Hermiticity, thus describing the transition from the chGUE to a generalized Ginibre ensemble. We briefly discuss applications to the Dirac operator eigenvalue spectrum in quantum chromodynamics with non-vanishing chemical potential
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