1,581 research outputs found
Rational Seifert Surfaces in Seifert Filtered Spaces
No full textRationally null-homologous links in Seifert fibered spaces may be represented combinatorially via labeled diagrams. We introduce an additional condition on a labeled link diagram and prove that it is equivalent to the existence of a rational Seifert surface for the link. In the case when this condition is satisfied, we generalize Seifert\u27s algorithm to explicitly construct a rational Seifert surface for any rationally null-homologous link. As an application of the techniques developed in the paper, we derive closed formulae for the rational Thurston-Bennequin and rotation numbers of a rationally null-homologous Legendrian knot in a contact Seifert fibered space. --author-supplied descriptio
Graduate Trumpet Recital - Seifert
No full textProgram for a graduate trumpet recital performed by Jan Seifert and assisted by Max Plummer, trombone, DiAnn Delaney, baritone horn, Alice Ann Seifert, pianist, and Donald Key, trumpet. They performed Gibbons, Bitsch, Hartley, Emmanuel, and Frackenpohl.https://digitalcommons.pittstate.edu/recital-fliers/1983/thumbnail.jp
Senior Recital - Seifert
No full textSenior Recital program for Jan Seifert, trumpet. She was assisted by Alice Ann Dechard, pianist; Donald Sieberns, violinist; Dorothy Strawn, violist; Max Plummer, pianist; Marilyn Smith, violinist; William Elliott, cellist; and Lowell Adams, contra bass. They performed Handel, Hindemith, Riisager, and Saint-Saens.https://digitalcommons.pittstate.edu/recital-fliers/1973/thumbnail.jp
Influence of Drone Altitude, Image Overlap, and Optical Sensor Resolution on Multi-View Reconstruction of Forest Images
Full text linkRecent technical advances in drones make them increasingly relevant and important tools for forest measurements. However, information on how to optimally set flight parameters and choose sensor resolution is lagging behind the technical developments. Our study aims to address this gap, exploring the effects of drone flight parameters (altitude, image overlap, and sensor resolution) on image reconstruction and successful 3D point extraction. This study was conducted using video footage obtained from flights at several altitudes, sampled for images at varying frequencies to obtain forward overlap ratios ranging between 91 and 99%. Artificial reduction of image resolution was used to simulate sensor resolutions between 0.3 and 8.3 Megapixels (Mpx). The resulting data matrix was analysed using commercial multi-view reconstruction (MVG) software to understand the effects of drone variables on (1) reconstruction detail and precision, (2) flight times of the drone, and (3) reconstruction times during data processing. The correlations between variables were statistically analysed with a multivariate generalised additive model (GAM), based on a tensor spline smoother to construct response surfaces. Flight time was linearly related to altitude, while processing time was mainly influenced by altitude and forward overlap, which in turn changed the number of images processed. Low flight altitudes yielded the highest reconstruction details and best precision, particularly in combination with high image overlaps. Interestingly, this effect was nonlinear and not directly related to increased sensor resolution at higher altitudes. We suggest that image geometry and high image frequency enable the MVG algorithm to identify more points on the silhouettes of tree crowns. Our results are some of the first estimates of reasonable value ranges for flight parameter selection for forestry applications
About the Author
Full text linkDr. Josef Seifert was the director of the master's and doctoral programs at the Institute of Philosophic Studies at the University of Texas at Dallas, USA (from 1972 to 1981), the Rector of the International Academy of Philosophy in Irving, Texas, since its foundation in 1980, Rector of the International Academy of Philosophy (IAP) in the Principality of Liechtenstein from 1986 to 2007 and Rector of the IAP at the Pontificia Universidad Católica de Chile in Santiago de Chile from 2004 to 2011 and held the title "Founding Rector of the IAP." From 2012 to 2017, he was Professor of Philosophy at the Academia Internacional de Filosofía - Instituto de Filosofía Edith Stein. Dr. Seifert is a full professor of philosophy and Rector of the International Academy of Philosophy in the Principality of Liechtenstein. He is the author of Gott als Gottesbeweis (God as Proof of His Existence): A Phenomenological Defense of the Ontological Argument (2nd ed. 2000) and over 50 books in German or English; he has also written 300 articles in 20 languages
An algorithm to calculate generalized Seifert matrices
No full textFriedl S, Kausik C, Qintanilha JP. An algorithm to calculate generalized Seifert matrices. Journal of Knot Theory and Its Ramifications. 2022.We develop an algorithm for computing generalized Seifert matrices for colored links given as closures of colored braids. The algorithm has been implemented by the second author as a computer program called Clasper. Clasper also outputs the Conway potential function, the multivariable Alexander polynomial, the Cimasoni-Florens signatures and the nullities of a link, and displays a visualization of the C-complex used for producing the generalized Seifert matrices
Cardiocondyla paranuda Seifert 2003
No full textCardiocondyla paranuda Seifert 2003 Tab. 2, Figs. 14 – 16 Cardiocondyla paranuda Seifert 2003: 246. Holotype worker: alledgedly Tunisia, Chabania [SMNG, antweb.org images of specimen FOCOL 0739] (examined). Holotype labels " TUNISIA: Medinine- 32 km SE Chabania- 6 km NW leg. H.Heatwole 1976“, " Holotype Cardiocondyla paranuda Seifert ", "GBIF-D/ FoCol 0 739 specimen and label data documented", and " Seifert (2017): Confusion of label by Collingwood. Terra Typica by morphometric analysis most probably Australia". Material examined A total of 30 nest samples with 52 workers were subject to NUMOBAT investigation. Australia: Australia: without site and date, holotype of C. paranuda; New South Wales: Barham, 1960.03.23, [-35.62, 144.15]; New South Wales: Belanglo State Forest, 1991.02.16, [-34.53, 150.25]; New South Wales: Black Mountains, 1997.xx.xx, [-35.28, 149.09]; New South Wales: Broken Hill, Parkland, 1971.05.18, [-31.96, 141,46]; New South Wales: Fowlers Gap, 1979.02.19, [-31.02, 146.60]; New South Wales: Lake Menindee, 1971.05.19, [- 32.32, 142.40]; Sydney, Concord, 1960.05.0 1, [-33.86, 151.10]; Northern Territory: Alice Springs, Kunoth Paddock, 1974.10.22, No I, [-23.517, 133.583]; Northern Territory: Alice Springs, Kunoth Paddock, 1974.10.24, No I, [-23.517, 133.583]; Northern Territory: Ayers Rock, 1981.10.xx, [-25.35, 131.03]; Northern Territory: SW Katherine, Manaulloo, 1978.04.xx, [-14.5, 132.2], Northern Territory: Simpson Gap, 1972.xx.xx, [-23.71, 133.71]; Northern Territory: Ti Tree Well- 11 km S, 1962.10.28, [-22.26, 133.38]; Northern Territory: above Baroalba springs, 1972.11.17, [-12.47, 132.51]; Northern Territory: Yulara, 2014.07.27, No AUS39 (GenBank LT718213) [- 25.24361, 130.98639]; Queensland: Chilcott Island, 1967.08.xx, [-16.95, 149.91]; Queensland: Chilcott Island, 1967.08.xx, [-16.25, 150.00]; Queensland: Coongie- 25 km S, 1975.08.xx, [-27.5, 140.0]; Queensland: Cunnamulla, 1974.09.17, [-28.070, 145.67]; Queensland: Woodstock- 52 km S, 1976.04.11, [-20.07, 146.82]; South Australia: Alton Down, Birdsville- 48 km SW, 1972.xx.xx, [-26.28, 139.10]; South Australia: Flinders Ranges, Elatina Hut 1 km NW, [-31.35, 138.63]; South Australia: Flinders Ranges, Westwloona- 14 km WSW, [-31.50, 138.50]; South Australia: Flinders Range, 1999.01.0 6, (GenBank DQ 023068) [-31.37, 138.63]; Western Australia: Derby City, 1982.xx.xx, [-17.31, 123.62]; Western Australia: Eurardy station, 2015.02.04/11, [-27.531, 114.667]; Western Australia: Perth: Kings Park, 1969.12.14, [-31.96, 115.87]; Western Australia: Perth, pre 1965 (coll. J. Clark), [-31.97, 115.840]. Redescription of worker caste. Worker (Tab. 2, Figs. 14 – 16): Head elongated, CL/CW 1.214. Postocular distance rather large, PoOc/CL 0.463. Eyes relatively small, EYE 0.234. Frontal carinae immediately caudal of the FRS level parallel or very slightly converging. Foveolae on vertex without interspaces, deeply impressed, with 13 – 19 µm diameter, and with an inner corona (a flat tubercle) of 7 – 9 µm diameter having the base of a decumbent pubescence hair in its center. This type of sculpture can also be described as a strongly sculptured microreticulum. Longitudinal sculpture on vertex often completely absent (Fig. 15). Weak semicircular rugae are found around the antennal fossae. Lateral mesosoma on whole surface regularly and strongly microreticulate-foveolate; longitudinal sculpture except for 4 – 6 weak and short carinulae on metapleuron completely absent (Fig. 16); dorsal mesosoma irregularly reticulate-foveolate-shagrinate. Sides of petiole with a deeply sculptured microreticulum, dorsal petiole and postpetiole with a weak and shallowly sculptured microreticulum. Cuticular surface of first gaster tergite rather smooth and shining but on its whole surface with a well-developed microreticulum (Fig. 14). The pubescence hairs on gaster tergites are the shortest within the C. nuda group, PLG/CS is only 5.06%. Metanotal depression very shallow, MGr/CS 1.28%. Propodeal spines short but clearly longer than in the C. mauritanica species complex. Dorsal propodeum sloping down to base of spines under an angle of 20°. Petiole node slightly longer than wide. Postpetiole in dorsal view with only suggestedly angulate sides and straight anterior margin that is slightly shorter than posterior margin; postpetiolar sternite bulging, without any protrusions but on each side with a suggested paramedian, longitudinal carina. Head, mesosoma, waist and appendages often amber-colored, gaster significantly darker—this is the most frequently observed coloration but populations with dark headed specimens or such with concolorous amber specimens do occur. For morphometric data of 52 workers see Tab. 2. Geographic range. Australia, only species of the whole genus Cardiocondyla occurring in inner Australia. Diagnosis. see key. The very short gastral pubescence is the most obvious difference to the sister species C. atalanta. Biology. C. paranuda is apparently well adapted to arid and very hot climate and the only species of the whole genus Cardiocondyla occurring in inner Australia. This is demonstrated by significant differences between C. atalanta and C.paranuda in the continentality of the sites. The mean distance from sea shore and mean annual rainfall are 23 ± 51 [0,252] km and 1430 ± 716 [500, 4500] mm in 27 sites of C. atalanta and 329 ± 332 [0, 904] km and 588 ± 385 [150, 1250] mm in 27 sites of C. paranuda. These differences are significantly different in both sea shore distance (ANOVA F1,52=22.39, p<0.0005) and annual rainfall (ANOVA F1,52=28.90, p<0.0005). As yet only foragers have been collected and colony structure, male morphology, and behavior are unknown. Comments. There is a serious problem with the site documentation in the holotype of C. paranuda. The specimen was sent by C.A. Collingwood to the senior author in the 1980s with the labelling " TUNISIA: Medinine- 32 km SE Chabania- 6 km NW leg. H.Heatwole 1976 “. If run as a wild-card in a LDA considering all 16 morphometric characters and collecting all samples of the C. mauritanica species complex in class 1 and all of the C. nuda complex in class 2, the holotype C. paranuda is allocated to the C. nuda complex with p=1.0000. This is problematic because species of the C. nuda species complex are completely absent from the West Palaearctic and North Africa and it appears also most unlikely that ants from Australia should have been anthropogenically introduced to a site in the Sahara desert. Furthermore, NC-clustering places the holotype in a cluster of C. nuda group specimens that are treated as a single species that is restricted to the Australian continent and sister to C. atalanta (Fig. 8). A wild-card run in a LDA confirms this allocation with p=0.9916 (see section 4.4). The most probable explanation for this conflicting situation is a confusion of labels. Harold Heatwole collected in North Africa, Tibet and Australia—for instance, the two C. paranuda samples from Queensland: Chilcott Island in 1967 were taken by him. He usually gave his specimens to Collingwood stored in tubes with ethanol. As repeatedly witnessed by the senior author in personal contacts during laboratory work in 1982 and 1990, Collingwood had the dangerous habit of placing similar ethanol-stored ants from different tubes side-by-side under the microscope for better comparison and sometimes he confused from which tube he had taken the specimens. We conclude that the type of C. paranuda has most probably been collected somewhere in Australia.Published as part of Seifert, Bernhard, Okita, Ichiro & Heinze, Jürgen, 2017, A taxonomic revision of the Cardiocondyla nuda group (Hymenoptera: Formicidae), pp. 324-356 in Zootaxa 4290 (2) on pages 346-349, DOI: 10.11646/zootaxa.4290.2.4, http://zenodo.org/record/82907
Analysing Author Self-citations in Computer Science Publications
Full text linkIn scientific papers, citations refer to relevant previous work in order to underline the current line of argumentation, compare to other work and/or avoid repetition in writing. Self-citations, e.g. authors citing own previous work might have the same motivation but have also gained negative attention w.r.t. unjustified improvement of scientific performance indicators. Previous studies on self-citations do not provide a detailed analysis in the domain of computer science. In this work, we analyse the prevalence of self-citations in the DBLP, a digital library for computer science. We find, that approx. 10% of all citations are self-citations, while the rates vary with year after publication and the position of the author in the list as well as with the gender of the lead author. Further, we find that C-ranked venues have the highest incoming self-citation rate, while the outgoing rate is stable across all ranks
A Cultural Challenge to Liberal Democracy in Southeast Asia? IHS Political Science Series No. 53, February 1998
Full text linkThis paper pleas for adopting a differentiated perspective on the current controversy over “Asian Values” and democracy. It presents a comparative analysis of the political systems of Singapore, Indonesia, and Malaysia, and depicts these polities as structurally similar cooptative systems which are undemocratic since they keep the given power structure in place by preventing opposition parties from ever being elected. In the light of their particular context, however, a more ambivalent picture emerges. Considering the contingent set of historic, ethnic and socioeconomic circumstances at work in the evolution of these systems, their performance in safeguarding public order and in providing economic prosperity has to be recognized. While an institutional analysis of the “Asian values” discourse can demonstrate the political character of cultural definition and distinction and can likewise avoid an essentialist interpretation, a tentative discussion of the prospects for democratization with emphasis on the emerging middle-classes draws a pessimistic picture for future democratization
Fillability of small Seifert fibered spaces
No full textOn small Seifert fibered spaces M(e0; r1, r2, r3) with e0 ≠ -1, -2 all tight contact structures are Stein fillable. This is not the case for e0 = -1 or -2. However, for negative twisting structures it is expected that they are all symplectically fillable. Here, we characterise fillable structures among zero-twisting contact structures on small Seifert fibered spaces of the form M(-1;r1,r2,r3). The result is obtained by analysing monodromy factorizations of associated planar open books. © The Author(s), 2022. Published by Cambridge University Press on behalf of Cambridge Philosophical Society
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