183,180 research outputs found
Diameter Bounds on the Complex of Minimal Genus Seifert Surfaces for Hyperbolic Knot
No full textGiven a link L in the 3-sphere, one can build simplicial complexes MS(L) and IS(L), called the Kakimizu complexes. These complexes have isotopy classes of minimal genus and incompressible Seifert surfaces for L as their vertex sets and have simplicial structures defined via a disjointness property. The Kakimizu complexes enjoy many topological properties and are conjectured to be contractible. Following the work of Gabai on sutured manifolds and Murasugi sums, MS(L) and IS(L) have been classified for various classes of links. This thesis focuses on hyperbolic knots; using minimal surface representatives and Kakimizu's formulation of the path-metric on MS(K), we are able to bound the diameter of this complex in terms of only the genus of the knot. The techniques of this paper are also generalized to one-cusped manifolds with a preferred relative homology class
Replication Data for: Eco-efficiency in the agricultural landscape of North Rhine-Westphalia, Germany
No full textThe dataset provides the R-script and the data to replicate the results of Seifert et al (2024) “Eco-efficiency in the agricultural landscape of North Rhine-Westphalia, Germany”
Formica anatolica Seifert & Schultz 2009, sp. n.
No full textFormica anatolica sp. n. Derivatio nominis: from the distribution in Anatolia. Type material examined: Holotype worker plus 4 worker paratypes labelled "TUR: 37.348° N, 34.360° E Hal-kapinar-32 rkm SE, Aydos Dagi 1600-1800 m, A. Schulz 1997.05.08-214" and " Holotype Formica anatolica Seifert & Schultz " / " Paratype Formica anatolica Seifert & Schultz "; SMN Görlitz. Material examined: 13 samples with 54 workers from Anatolia (Turkey) were subject to a numeric analysis of 18 characters (Fig. 18). For details, see Appendix, as digital supplementary material to this article, at the journal's web pages. Description of worker (Tab. 2, Fig. 8): large Servifor-mica species (CS 1.401 mm), head and scape significantly shorter than in F. rufibarbis (CL / CW1.4 1.110, SL / CS1.4 1.031) and eye distinctly larger (EYE / CS1.4 0.303). Petiole very wide (PEW / CS1.4 0.484). Clypeus with sharp median keel and fine longitudinal microcarinulae. Frontal triangle finely transversely rippled and with 55 - 80 short pubescence hairs. Eyes with microsetae of 8 - 10 μ m maximum length. Total mean of unilateral setae numbers on different body parts predicted for a specimen with CS = 1.4 mm: pronotum 8.9, mesonotum 4.2, propodeum plus dorsolateral metapleuron 0.1, petiole dorsal of spiracle 0.8, flexor profile of hind tibia 1.4, underside of head 1.6 (only species of the F. rufibarbis group usually having gular setae). Posterior margin of head normally without setae. Ventral coxae and gaster tergites with long setae. Dorsal mesonotum in profile broadly convex. Metanotal depression rather deep. Propodeal dome in profile obtuse-angled or rounded, the basal profile sometimes linear or slightly concave. Dorsal crest of petiole in frontal view rounded, sometimes (especially in larger specimens) with a straight or slightly excavated median portion. Petiole scale in lateral aspect thin, with convex anterior and more straight posterior profile. Gaster with transverse microripples of small distance (RipD 4.6 μ m) and covered by dense silvery pubescence (sqPDG 3.4). Pubescence on head, meso-soma and petiole dense. Posterior vertex, often dorsal pro-mesonotum, coxae and all appendages dark brown, gaster always dark brown. Other body parts reddish. In overall impression, this species appears relatively dark with remarkable contrasts between brown and reddish parts, especially on genae. Comments on taxonomy: Well separable from any other Palaearctic species. The very clear distinction from the other two setose species, F. rufibarbis and F. tarimica sp. n., has already been presented above (Fig. 15). The short head, short scape, large eye and pilosity on underside of head suggest certain affinities to the F. cinerea group but the very wide petiole scale and overall pilosity pattern indicate an allocation to the F. rufibarbis group. 13 samples with 54 workers were subject to a numeric analysis of 18 characters. Turkey: Halkapinar (type), 8.V.1997 [37.348° N, 34.36° E]; Bakirdagi, 10.V.1997 [38.217° N, 35.917° E]; Belören (3 samples), 4.VI.1993 [37.211° N, 32.546° E]; Cankurtaran, 10.V.2003 [38.155° N, 31.239° E]; Carmadi (2 samples), 31. V.1993 [37.823° N, 35.102° E]; Imrasan Gecidi (2 samples), 3.V.1997 [37.133° N, 31.800° E]; Seydisehir, 5.VI.1993 [37.350° N, 31.750° E]; Sylemaniye, 5.VI.1993 [37.100° N, 31.750° E]; Ücpinnar, 4.VI.1993 [37.126° N, 32.250°]. Distribution and biology: So far only known from south-central Anatolia in the region of the Taurus Mountains (Toros Daglari). Occurring there at elevations between 1300 and 1900 m. Most remarkable habitat selection: so far only found in woodland stands with Abies, Juniperus, Quercus and other deciduous tree species, occasionally interspersed with grassland patches.Published as part of Seifert, B. & Schultz, R., 2009, A taxonomic revision of the Formica rufibarbis Fabricius, 1793 group (Hymenoptera: Formicidae)., pp. 255-272 in Myrmecologische Nachrichten 12 on page 2
Formica persica Seifert & Schultz 2009, sp. n.
No full textFormica persica sp. n. Derivatio nominis: from Persia - the terra typica of this species. Type material examined: Holotype worker plus 6 worker paratypes (4 stored in ethanol) labelled "IRAN: 36.767° N, 54.567° E, Tuskestan forest, 900 m Juniperus forest O. Paknia 2005.09.23-517" and " Holotype Formica persica Seifert & Schultz " / " Paratype Formica persica Seifert & Schultz "; SMN Görlitz. Material examined: 20 samples with 54 workers from Iran were subject to a numeric analysis of 18 characters (Fig. 20). For details. see Appendix, as digital supplementary material to this article, at the journal's web pages. 20 samples with 54 workers from Iran were subject to a numeric analysis of 18 characters. Iran: Tuskestan forest (type), 23.IX.2005 [36.767° N, 54.567° E]; Chorteh, 8.VII.1973 [36.767° N, 50.583° E]; Dela-restagh vill., 13.VII.2004 [36.400° N, 52.535° E]; Golestan N.P., 29.V.2004 [37.383° N, 55.767° E]; Golestan N.P., 14. V.2007 [37.367° N, 55.817° E]; Golestan N.P., 11.VI.2008 [37.398° N, 55.798° E]; Golestan N.P., 11.VI.2008 [37.388° N, 55.804° E]; Golestan N.P., 14.VI.2008 [37.383° N, 55.817° E]; Asalem, 26.VI.1973 [38.400° N, 48.600° E]; Mazandaran, 30.07.2007 [36.170° N, 53.215° E]; Nowshahr, 25.VI.2008 [36.601° N, 51.585° E]; Abpari forest, 27.VI.2008 [36.502° N, 51.932° E]; Abpari forest, 27.VI.2008 [36.501° N, 51.982° E]; Talesh (2 samples, No. 3400, 3454), 6.VII.2008 [37.617° N, 48.744° E]; Talesh, 6.VII.2008 [37.681° N, 48.834° E]; Talesh, 7.VII.2008 [37.679° N, 48.808° E]; Talesh, 7.VII. 2008 [37.705° N, 48.887° E]; Talesh, Alasem r., 9.VII.2008 [37.681° N, 48.834° E]; Tehran, Pol-e-Zanguleh, 12.VII. 1973 [36.217° N, 51.317° E]. Description of worker (Tab. 1, Fig. 10): medium-sized Serviformica species (CS 1.332 mm), head and scape much longer than in F. cunicularia (CL / CW1.4 1.162, SL / CS1.4 1.152). Petiole rather wide (PEW / CS1.4 0.450). Distance between lateral ocelli moderate (OceD / CS1.4 0.162), eye medium-sized (EYE / CS1.4 0.297). Clypeus with sharp median keel and fine longitudinal microcarinulae. Frontal triangle finely transversely rippled and with 45 - 85 short pubescence hairs. Eyes with microsetae of 9 μ m maximum length. Pronotum, mesonotum, petiole, flexor profile of hind tibia, posterior margin of head, propodeum, and dorso-lateral metapleuron normally without setae. Ventral coxae with long setae, setae on dorsum of first gaster tergite sometimes lacking. Dorsal mesonotum in lateral aspect broadly convex, but in small ants flatter. Metanotal depression in larger specimens deep, in small specimens shallow. Propo-deal dome in profile obtuse-angled or rounded. Dorsal crest of petiole in frontal view convex, sometimes obtuse-angled. Petiole scale in lateral aspect slender, with convex anterior and more straight posterior profile. Mean distance of transverse microripples on dorsum of gaster larger than in F. cunicularia (RipD 5.8 μ m). Gaster covered by a dense silvery pubescence (sqPDG 3.3). Pubescence on head, me-sosoma and petiole less dense, ants appear somewhat shiny. Posterior vertex, often dorsal promesonotum, coxae, and all appendages brown, gaster always dark brown. Other body parts yellowish-reddish. Comments on taxonomy: The clear separation of F. tianshanica sp. n. from F. cunicularia and F. persica sp. n. has already been stated above (Fig. 17). It is unknown if there are contact areas with the Anatolian and Caucasian population of F. cunicularia. Distribution and biology: So far, only known from the North Iranian region of the Elburs Mountains between 48.5° to 56° E and 36.2° to 38.4° N, in a region with much precipitation (600 - 1500 mm per year). Altitudinal range from sea level up to 2300 metres. Occurs in highly diverse habitats from steppe, human settlements, rural areas, river sides, and frequently inside of forests. The forest sites are below 1000 metres and include deciduous and Juniperus forests.Published as part of Seifert, B. & Schultz, R., 2009, A taxonomic revision of the Formica rufibarbis Fabricius, 1793 group (Hymenoptera: Formicidae)., pp. 255-272 in Myrmecologische Nachrichten 12 on pages 268-26
Formica orangea Seifert & Schultz 2009, sp. n.
No full textFormica orangea sp. n. Derivatio nominis: from the mainly orange body colour. Type material examined: Holotype worker plus 4 worker paratypes labelled "KIR: 41.8327° N, 71.1948° E Tshat-kal valley, 1830 m R. Schultz 1998.07.28-115" and "Holo-type Formica orangea Seifert & Schultz " / " Paratype Formica orangea Seifert & Schultz ", 5 paratype workers in etha-nol, SMN Görlitz; from the same nest series: 3 mounted paratype workers and 19 paratype workers in ethanol, coll. RS. Material examined: 32 samples with 100 workers were subject to a numeric analysis of 18 characters (Figs. 18, 19): Afghanistan (2), Iran (1), Kazakhstan (4), Kyrgyzstan (10), Mongolia (14), Uzbekistan (1). For details, see Appendix, as digital supplementary material to this article, at the journal's web pages. Description of worker (Tab. 1, Fig. 6): medium-sized Serviformica species (CS 1.349 mm), head short (CL / CW1.4 1.111), scape shortest and distance of lateral ocelli largest within the F. rufibarbis group (SL / CS1.4 1.021, OceD / CS1.4 0.172), eye relatively small (EYE / CS1.4 0.288), petiole relatively narrow (PEW / CS1.4 0.421). Clypeus with sharp median keel and fine longitudinal microcarinulae. Frontal triangle finely transversely rippled and with 35 -60 short pubescence hairs. Eyes with microsetae of 10 -13 μ m maximum length. Total mean of unilateral setae numbers on different body parts predicted for a specimen with CS = 1.4 mm: pronotum 1.5, mesonotum 0.8, petiole scale dorsal of spiracle 0.2, flexor profile of hind tibia 0.3. Posterior margin of head and propodeum plus dorsolateral metapleuron normally without setae. Ventral coxae and gaster tergites with long setae. Dorsal mesonotal profile broadly rounded. Metanotal depression moderately deep. Propodeal dome in profile flatly rounded to angled, the basal profile sometimes slightly concave. Dorsal crest of petiole in frontal view broadly convex. Petiole scale in lateral aspect relatively low and thicker than in other species of the F. rufi-barbis group, except F. tarimica sp. n., with convex anterior and straight to slightly convex posterior profile. Gaster with transverse microripples of rather large distance (RipD 6.7 μ m, second largest within the F. rufibarbis group) and covered by dense silvery pubescence (sqPDG 3.15). Pubescence on head, mesosoma and petiole less dense. Whole head, mesosoma, coxae, all appendages, and petiole in typical cases reddish yellow; sometimes in smaller specimens brown spots may occur on posterior vertex and dorsal pro-mesonotum, but always with low contrast between the pig-mented and the light parts, gaster always brown. Comments on taxonomy: Formica orangea sp. n. shows an unmistakable combination of orange colour, short head, short scape, high interocellar distance, low pronotal setae numbers and large microripple distance on gaster tergites (Tab. 1). 32 samples with 100 workers were subject to a numeric analysis of 18 characters. Afghanistan: Kabul, 18.IX.1952 [34.41° N, 69.16° E, coordinates estimated]; Tangi Saidan, 27.V.1952 [34.42° N, 69.17° E, coordinates estimated]. Iran: Ghuchan, 29.VII.2005 [37.41° N, 58.5° E, coordinates estimated]. Kazakhstan: Lake Zaysan (2 samples, No. 215, 355), 26.VII.2001 [47.682° N, 84.646° E]; Zaysan Basin, 25.VII.2001 [47.707° N, 85.300° E]; Zaysan Basin, 26.VII.2001 [47.711° N, 85.303° E]. Kyrgyzstan: Issyk Kul (3 samples, No. 174, 177, 181), 22.VII. 2000 [42.367° N, 76.200° E]; Issyk Kul (2 samples, No. 55, 56), 22.VII.2000 [42.368° N, 76.195° E]; Karavshin vall. (2 samples, No. 152b, 162b), 24.VII.2004 [39.781° N, 70.412° E]; Shamaldy-Say, 31.VII.2004 [41.119° N, 72.189° E]; Tshatkal vall. (2 samples, 115: type, 116), 28.VII.1998 [41.833° N, 71.195° E]. Mongolia: Bogd Sum, 19.VIII.1997 [45.141° N, 100.900° E]; Elsen Tasarkhai, 21.VII.2003 [47.389° N, 103.661° E]; Gobi Altai, 29.VII.2003 [44.54° N, 99.34° E, coordinates estimated]; Urtiyn ekh Oasis (6 samples, No. 326, 329, 403, 404, 405, 414), 31.VII.2003 [44.811° N, 97.368° E]; Zuun Mod Oasis (3 samples, No. 165, 166, 183), 16.VIII.1997 [43.232° N, 99.008° E]; Zuun Mod Oasis, 18.VIII.1997 [43.265° N, 99.218° E]; M515B, 2003, [leg. Pfeiffer, without location]. Uzbekistan: Tash-Kurgan, 22.VIII.1897 [38.37° N, 67.93° E, coordinates estimated]. Distribution and biology: Occurring in the Oriental-Turanian and Central Asian floristic region of the south sub-meridional and meridional zones. Ranging from 58° (Iran) to 104° E (Mongolia) and 34° (Afghanistan) to 48° N (Kazakhstan) at elevations between 400 and 2200 m. Prefers dry steppe and semi-desert habitats, in the vicinity of rivers or lakes. Invades rural areas and gardens. Nests found in moderately dry sand, often with characteristic slant gateways leading to the underground. Foraging on available trees, probably tending trophobionts.Published as part of Seifert, B. & Schultz, R., 2009, A taxonomic revision of the Formica rufibarbis Fabricius, 1793 group (Hymenoptera: Formicidae)., pp. 255-272 in Myrmecologische Nachrichten 12 on page 26
Shear connection between steel beam and timber panel
No full textThis thesis deals with experimental tests of two simply supported composite beams (steel - timber) loaded in bending. The first beam is assembled of a steel beam IPE140 and a glued laminated (GL) timber plate. The second beam has equal steel cross-section and a cross-laminated timber (CLT) plate. The thesis focuses on the manufacturing and construction procedures of the beams, the preparation for testing and on the analysis of test results. The missing material properties are calculated from the test results. The degree of shear connection is calculated from the test results using th
Cardiocondyla bicoronata Seifert 2003
No full text<p> <i>Cardiocondyla bicoronata</i> Seifert, 2003</p> <p>Remarks: Described by Seifert (2003) from Jordan, also recorded from Israel, Yemen and the UAE (Al-Ain zoo). No recent records.</p>Published as part of <i>Cedric A. Collingwood, Donat Agosti, Mostafa R. Sharaf & Antonius van Harten, 2011, Order Hymenoptera, family Formicidae, pp. 1-70 in Arthropod fauna of the UAE 4</i> on page 17, DOI: <a href="http://zenodo.org/record/1168586">10.5281/zenodo.1168586</a>
Cardiocondyla longiceps Seifert 2003
No full textCardiocondyla longiceps Seifert, 2003 Cardiocondyla longiceps Seifert, 2003. - Ann. Naturhist. Mus. Wien 104 B: 259. (Yemen: Socotra Island). Specimens examined: Yemen, Socotra Island: 1 ♀ (holotype), 3 ♀ ♀ (paratypes), Hadibo, 14.IV.1993, A. van Harten, SMNG. Remarks: This species has been just recently described (Seifert 2003) from winged gynes originating both from Socotra Island and the Yemen mainland (Ta’izz). The workers are as yet unknown. As a member of the Cardiocondyla shuckardi-group, the new species has the propodeal spines much shorter than in C. emeryi, a character true also for workers in this species group. On the known measurements of gynes and workers in related species, Seifert (2003) predicted morphometric data for C. longiceps workers, on the basis of which we include the species in the key. The species of the C. shuckardi-group inhabit arid parts of Madagascar, Africa, southern Arabia and the Middle East. Cardiocondyla longiceps may be predicted to occur around the Horn of Africa also.Published as part of Collingwood, C. A., Pohl, F., Güsten, R., Wranik, W., van Harten, A., 2004, The ants (Insecta: Hymenoptera: Formicidae) of the Socotra Archipelago, pp. 473-495 in Fauna of Arabia 20 on pages 479-480, DOI: 0.5281/zenodo.1256
Teichmüller spaces of seifert fibered manifolds with infinite π1
No full textAbstractA Seifert fibered manifold with infinite π1 has a geometric structure modeled on one of H2×R, SL, E3, Nil, S2×R. There is no rigidity so we can define Teichmüller space for every Seifert fibered manifold with infinite π1. In this paper we determine the homeomorphism types of the Teichmüller spaces of Seifert fibered manifolds and study their properties
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