159,810 research outputs found
On the oxen-born bees of the ancients '(Bugonia)' and their relation to Eristalis tenax, a two-winged insect
No full textC. R. Osten SackenEnlarged edition of the essay: On the so-called Bugonia of the ancients etc. published in the Bullet. soc. ent. ital. 1893Geschenkexlibris-Etikette: "Geschenk aus dem Nachlass von August Waldner." 002230265_0001 Exemplar der ETH-BIBHandschriftliches Geschenkexlibris: "An Herrn A. Waldner, in Zürich hochachtungsvoll vom Verfasser C.R. Osten Sacken Heidelberg, d. 29. April 1896." 002323175_0001 Exemplar der ETH-BI
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
Coronal Spectroscopy for Dynamo Studies
No full textMagnetic reconnection lies at the heart of much stellar phenomena in the cool half of the H-R diagram, and X-ray studies of stellar coronae have revealed the intricate interplay of plasma and magnetic fields, ultimately produced as the result of a dynamo process. The breakthrough of Chandra and XMM-Newtons high resolution spectrometers for these stars lay in revealing the wealth of diagnostic information, used to demonstrate the structuring and energetics of hot plasma, and the extent to which magnetic fields shape and influence stellar surroundings. In this talk I will describe how high resolution, high throughput spectra with the XRS continue the challenge of linking a well-studied star like our Sun with representative stellar samples to probe dynamos in the stellar extremes of thick/thin outer convection zones, and time-varying influences of magnetic fields.Session 4: Physics of New Worlds
Chair: Martin Lamin
Dicranoptycha Osten Sacken
No full textDicranoptycha Osten Sacken Marginomyia Meigen, 1818 (nomen nudum). Dicranoptycha Osten Sacken, 1859: Lackschewitz & Pagast (1942); Ishida (1959); Savchenko & Krivolutskaya, 1976; Savchenko (1982, 1983, 1989). Type species— Dicranoptycha germana Osten Sacken, 1859. Korean short-palped crane flies, belonging to genus Dicranoptycha Osten Sacken, 1859 are comparatively large, with a wing length ranging from 8.0 to 11.5 mm (Fig. 1). Main body color varies from gray to brown and light brown, sometimes even brownish yellow (Fig. 2). Antennal flagellum 14 -segmented. Distinct tubercular pits situated some distance beyond frontal margin of thoracical prescutum, pseudosutural fovea close to them (Fig. 3). Wing long, grayish or brownish, sometimes darkened along longitudinal veins. Stigma indistinct. Vein Sc long, tip of Sc 1 reaches distinctly beyond branching point of Rs, Sc 2 close to Sc 1 tip. Arculus present. Cross-vein R 2 close to R 1 tip. Radial sector (Rs) comparatively short and could be variable even in same species. It is usually slightly arched, but could be also angulated and short-spurred at base. It branches into two veins R 2 + 3 and R 4 + 5. Discal cell closed, elongate. Basal deflection of CuA 1 distinctly beyond branching point of M, usually before mid-length of discal cell. The most distinctive feature of the genus is fold in cell cu (Fig. 4), which is not known in other genera of Limoniidae. Meron is strongly reduced, thus second and third pairs of coxae are close together. Male genitalia slightly elongate. Ninth tergite and ninth sternite forming complete genital ring. Posterior margin of ninth tergite with large shallow median incision. Lateral process of lateral apodeme of vesica large. Two pairs of terminal gonostyli. Outer gonostylus usually dark, strongly sclerotised and slightly arched. Inner gonostylus wide and fleshy. Edeagal complex usually strongly complicated and species-specific. Ovipositor with comparatively short, widened, round-tipped cercus. Some non-Korean species have modified and widely spread cerci. Korean Dicranoptycha start flying comparatively late, from the middle of June, but they are most active in late summer and fall. Larvae are metapneunistic, developing in soil under leaf litter or wood debris (Young, 1987).Published as part of Podenas, Sigitas, Byun, Hye-Woo & Kim, Sam-Kyu, 2015, New Dicranoptycha Osten Sacken, 1859 Crane flies (Diptera: Limoniidae) of North and South Korea, pp. 257-270 in Zootaxa 3925 (2) on page 259, DOI: 10.11646/zootaxa.3925.2.7, http://zenodo.org/record/24093
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
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.
Olbiogaster Osten Sacken 1878
No full text<i>Olbiogaster</i> Osten Sacken <p> <i>Olbiogaster</i> Osten Sacken, 1886: 20. Type species <i>Rhyphus taeniatus</i> Bellardi (designated by Coquillett 1910: 579).</p> <p> <b>Diagnosis</b>. (Modified from Amorim & Tozoni 1994). Eye nearly bare; palpus with five segments; anepisternum and anepimeron with patches of fine setae, katepisternum bare, shiny. R 5 ending only slightly beyond wing apex; M 3 weaker than other posterior veins. Gonocoxites with patch of lateral setae, gonostyli slender, with setae on the outer face; sternite 10 bifid apically, with a pair of lateral projections, slender at base but apically enlarged.</p>Published as part of <i>Huerta, Heron, Dzul-Manzanilla, Felipe, Navarrete-Carballo, Juan C., Manrique-Saide, Pablo & Hancock, E. Geoffrey, 2019, Olbiogaster Osten Sacken (Diptera: Anisopodidae) from Mexico, with the description of three new species, pp. 475-492 in Zootaxa 4565 (4)</i> on page 476, DOI: 10.11646/zootaxa.4565.4.2, <a href="http://zenodo.org/record/2591307">http://zenodo.org/record/2591307</a>
- …
