1,470 research outputs found
Phonétique et linguistique romanes : mélanges offerts à M. Georges Straka.
No full text"Bibliographie de M. Georges Straka": v. 1, p. [12]-22. Includes bibliographical references
Présentation de M. Georges Straka
No full textHenry Albert. Présentation de M. Georges Straka. In: Bulletin de la Classe des lettres et des sciences morales et politiques, tome 67, 1981. pp. 493-495
Phonétique et linguistique romanes: Mélanges offerts à M. Georges Straka. Lyon-Strasbourg, 1970; 2 tomos: 479, 236 pp.
No full textSe reseñó el libro: Phonétique et linguistique romanes: Mélanges offerts à M. Georges Straka.</jats:p
Miscophus cappadocicus Schmid-Egger & Straka 2019, stat. nov.
No full textMiscophus cappadocicus de Beaumont, 1967, stat. nov. (Fig. 9) Miscophus mavromoustakisi cappadocica de Beaumont, 1967:333, female, incorrect original termination. Holotype female, Turkey: Kayseri: Erciyes Dagi (BMNH). Paratype examined by CSE. Diagnosis. M. cappadocicus is a member of the M. nicolai group sensu Schmid-Egger & Bitsch (2007) and is close to M. nicolai from southwestern Europe. It can be recognized by a shorter propodeal dorsum, compared with M. nicolai. The species can be distinghuished from M. mavromoustakisi from Cyprus by a less dense punctation of scutum and vertex. Punctures in M. cappadocicus are more than a diameter apart on average, whereas in M. mavromoustakisi punctures are less than a diameter apart. See de Beaumont (1967) for a complete description. Specimens from Slovakia and other European origins agree with Turkish specimens and with the type description. Geographic distribution. Bulgaria, Greece, Hungary, Italy, Slovakia, Turkey. Material examined: BULGARIA: 1 ♀ 18.v.1979 Sandanski (OLL), ITALY: 1 ♂ 15.vi.2002 Sicily, Madonie, 4 km E of Coliesano (Schmid-Egger 2003), GREECE: Peleponnes: 2 ♀♀ 20.v.1996, 4 ♀♀ 7.vii.1996 Kalogria; Katheri, 1 ♀ 24.vi.1996 Stymph. lake (Arens)— 1 ♀ 18.v.1982 Santorini, Akrotiri (CSE)— 1 ♀ 29.76.1983 Cykladen, Paros (Leiden). GREECE /RHODOS: 1 ♀ 1 ♂ 25.ix.1958 Xixia (MZL, M. mavromoustakisi ssp. det. de Beaumont 1965)— 1 ♀ 19.vi.2001 Haraki (CSE), 1 ♀ 19.vi.2001 Kolimbia (CSE)— 9 ♀♀ 20.vii.1999 Faliraki (Schlaefle). GREECE / CRETE 1 ♂ 25.v.1963 Heraklion (MZL, sp. det de. Beaumont)— 1 ♂ 25.v.1963, Heraklion (Schwarz). SLOVAKIA: 1 ♀ August 1961 Slov. mer, Chotin (OLL). HUNGARY: 4 ♀♀ 4 ♂♂ 9.viii.2004 50 km SE Budapest (OLL); 1 ♀ 8 ♂♂ 7.vi.2015 Örkeny 47.11021,19.394447 (JSPC); 1 ♀ 20.–21.vii.2015 Oktatasi Központ, Fülophaza env., sand dunes 46.87225,19.400792 (Benda). TURKEY: 1 ♀ 1.viii.1960 Amasiya, 30km Amasya-Mecitozu (MZL, M. mavromoustakisi cappadocia det. de Beaumont 1964, paratype— 2 ♂♂ 13.vi.2000 30 km N Kuthaya; ♀ 17.vi.1998 Bolu, 17 km S Seben (OLL). Comment. Specimens from Hungary formerly identified by us as M. mavromoustakisi Andrade (1953) with the key of Andrade (1960), differ genetically from M. mavromoustakisi from Cyprus. De Beaumont (1967) described a subspecies M. mavromoustakisi cappadocicus from Turkey, and his recognition characteristics also agree with the specimens from Europe. Consequently, we elevate M. cappadocicus to the rank of valid species (stat. nov.) ranging from Turkey to southeastern and central-eastern Europe, whereas M. mavromoustakisi s. str. occurs in Cyprus only. Specimens from Greece mentioned as M. nicolai in Schmid-Egger & Bitsch (2007) refer also to M. cappadocicus. M. nicolai occurs only in southwest Europe and northwest Africa. See also Schmid-Egger (2003).Published as part of Schmid-Egger, Christian & Straka, Jakub, 2019, Miscophus Jurine, 1807 (Hymenoptera, Crabronidae) in Central, Northern, and Eastern Europe, pp. 334-346 in Zootaxa 4571 (3) on pages 340-341, DOI: 10.11646/zootaxa.4571.3.2, http://zenodo.org/record/261268
Processing and Visualization of Peripheral CT-Angiography Datasets
No full textIn dieser Arbeit werden die einzelnen Schritte der Bearbeitung von Datenssätzen, die mittels Computer TomographyAngiography (CTA) gewonnen wurden, vorgestellt. Periphäre CTA-Datensätze sind volumetrischeDatensätze, die pathologische Veränderungen der Blutgefäße der unteren Extremitäten des menschlichen Körpersdarstellen. Diese Veränderungen sind das Ergebnis verschiedener atherosklerotischer Krankheiten wie z.B. derPeripheral Arterial Occlusive Disease (PAOD) und ihre frühe und genaue Diagnose trägt wesentlich zur Planungeiner späteren interventionellen radiologischen Behandlung.Die Diagnose stützt sich auf die Visualisierung des abgebildeten Gefäßbaumes, wo die individuellen pathologischenVeränderungen, solche als Plaque, Verkalkungen, Stenosen des Gefäßdurchgangs und Verstopfungendesselben sichtbar werden. CTA entwickelte sich über die letzten Jahre zu einem robusten, genauen, kosteneffizientenAbbildungsverfahren für Patienten mit sowohl coronaren als auch arteriellen Erkrankungen. AlsFolge der CTA-Prozedur entsteht ein Satz von 1200 2000 transversalen Schnittbildern, die die Blutgefäße mittelseines intravenös verabreichten Kontrastmittels hervorheben. Die Anzahl der erzeugten Schnittbilder ist sehrhoch und infolgedessen ihre manuelle Untersuchung müheselig und zeitintensiv. Deswegen wurden Nachbearbeitungsmethodenzur schnelleren und intuitiveren Darstellung der abgebildeten Gefäße entwickelt. EinfacheVisualisierungen mittels traditionellen Techniken wie Maximum-Intensity Projection (MIP) oder Direct VolumeRendering (DVR) sind jedoch wegen des Vorhandenseins von Knochen im Datensatz, welche die Gefäßeverdecken, nicht zielführend. Deswegen ist eine Folge von Operationen, die Bearbeitungspipeline, die zurErzeugung von klinisch-relevanten Bildern mit unverdeckten Gefäßen führt, notwendig.Im ersten Schritt der Pipeline wird der Datensatz segmentiert und die Gewebearten darin klassifiziert umeine spätere Gefäßidentifikation und Knochenentfernung zu erlauben. Wegen der hohen Dichte und der räumlichenVariabilität der Gewebearten ist das eine komplexe Aufgabe. Traditionelle Bildverarbeitungstechnikenliefern keine brauchbaren Ergebnisse deswegen stellen wir in dieser Arbeit neue Zugänge, die zusätzliche, anatomische Information in den Segmentierungs- und Klassifizierungsprozeßeinbringen, vor. Wir schlageneinen probabilistischen Atlas vor, der das Modellieren der räumlichen und der Dichteverteilung in einem Datensatzerlaubt um ihre bessere Klassifizierung zu ermöglichen. Beim Atlasaufbau werden die non-rigid thin-platespline Warping und die Registrierung der Datensätze angewendet, um der hohen anatomischen Variabilitätzwischen Patienten Rechnung zu tragen. Das Atlaskonzept wird weiter durch die Watershed Transform um dieGenauigkeit der Registrierungsprozedur zu erhöhen erweitert. Als Alternative schlagen wir vor und evaluiereneine Technik zur Gefäßhervorhebung, die auf Hessscher Filterung basiert, um die Aufdeckung und Erkennungder Gefäßstrukturen ohne Operatorüberwachung zu erlauben.Im zweiten Schritt wird ein geometrisches Modell des Gefäßbaums konstruiert, der es erlaubt Informationenüber die Zentrallinien der Gefäße abzuleiten. Hierzu wird ein schon vorhandener Algorithmus verwendet, derauf dem sogenannten Vessel-Tracking aufbaut, das mittels optimaler Pfadsuche mit Verbesserungen um dasgeometrische Modell genauer zu machen implementiert ist.Der dritte Schritt der Bearbeitungspipeline, die Visualisierung, verlangt ein genaues Modell, da ihre Ergebnissewesentlich durch ein potenziell ungenaues Modell beeinflußt werden können, was zu klinisch irreführendenBildern führt. Um die Unzulänglichkeiten der Gefäßvisualisierung mittels herkömmlichen Techniken alsMIP, CPR oder DVR zu beseitigen schlagen wir ihre Verallgemeinerung als Focus & Context-Konzept, das wirVesselGlyph nennen, vor. VesselGlyph erlaubt verschiedene Visualisierungstechniken in einem Bild intuitivund systematisch zu kombinieren um bessere, umfassendere und unverdeckte Gefäßansichten für diagnostischenZwecke zu erzeugen.Um das Design und die Entwicklung der vorgeschlagenen Segmentierungs-, Modellierungs- und Visualisierungsalgorithmenzu fördern und ihre Anwendung in klinischer Umgebung zu ermöglichen haben wireinen Satz von Werkzeugen um die AngioVis-ToolBox entwickelt. In dieser Anwendung werden die einzelnenSchritte der Bearbeitungspipeline realisiert. Die Toolbox wird mit zusätzlichen Hilfsprogrammen vervollständigt die zusammen eine vollfunktionsfähige medizinische Arbeitsstationssoftware ergeben die regelmäßigum Patientendaten in einer klinischen Umgebung zu bearbeiten eingesetzt wird. - In this thesis, individual steps of a pipeline for processing of the peripheral Computed Tomography Angiography(CTA) datasets are addressed. The peripheral CTA datasets are volumetric datasets representing pathologiesin vascularity of the lower extremities in the human body. These pathologies result from various atheroscleroticdiseases as e.g. the Peripheral Arterial Occlusive Disease (PAOD) and their early and precise diagnosticssignificantly contributes to planning of a later interventional radiology treatment.The diagnostics is based on visualization of the imaged vascular tree, where individual pathologic changes,as plaque, calcifications, stenoses of the vessel lumen and occluded parts of the vessels are visible. CTA hasevolved within the recent years into a robust, accurate and cost effective imaging technique for patients withboth coronary and arterial diseases. As a result of the CTA scanning, a set of 1200 2000 transverse slices isacquired, depicting vessels enhanced by means of an intravenously injected contrast medium. The number ofslices is high and therefore their manual examination is laborious and lengthy. As a remedy, post-processingmethods were developed to allow faster and more intuitive visualization of the imaged vascularity. However,simple visualization by means of the traditional techniques as maximum-intensity projection (MIP) or directvolume rendering (DVR) is hampered due to the presence of bones in the dataset, which occlude the vessels.Therefore, a sequence of operations the processing pipeline is needed, leading to generation of clinicallyrelevant images which depict unobstructed vessels.In the first step of the pipeline the dataset is segmented and the tissues are classified, to allow subsequentvessel identification and bone removal. This is a complex task because of high density and spatial variability ofthe tissues. Traditional image processing techniques do not deliver acceptable results and therefore in the thesiswe present new approaches that introduce additional anatomic information into the segmentation and classificationprocess. We propose a probabilistic atlas which enables modeling of spatial and density distributions ofvessel and bone tissues in datasets, to allow their improved classification. In the atlas construction the non-rigidthin-plate spline warping and registration of the datasets are applied, to address the high anatomic variabilityamong the patients. The concept of the atlas is further extended by means of the watershed transform, to furtherimprove precision of the registration procedure. Alternatively, we propose and evaluate a technique for vesselenhancement based on Hessian filtering to allow detection and recognition of vessel structures without operatorsupervision.In the second step a geometric model of the vessel tree is constructed to derive information about the vesselcenterlines. Here, an already available algorithm based on the so-called vessel-tracking, implemented by meansof optimal path searching, is exploited with improvements to make the geometric model more precise.The third step of the processing pipeline visualization requires this model, since its results can be significantlyinfluenced by a potential imperfections, bringing in clinically misleading images. To address limitationsof the vessel visualization by means of the existing techniques as MIP, CPR or DVR we propose their generalizationin form of a focus & context-based concept called VesselGlyph. VesselGlyph enables to combineintuitively and systematically various visualization techniques to single a image to allow better, more comprehensiveand unoccluded view of vessels for the diagnostic purposes.To support the design and development of the proposed segmentation, modeling and visualization algorithmsand to enable their application in the clinical environment, we implemented a set of tools grouped in the AngioVisToolBox software. Within this application, individual steps of the processing pipeline are accomplished.The toolbox is complemented with additional utilities constituting together a fully-functional medical workstationsoftware which is regularly used to process patient data on a daily basis in the clinical environment.EG Graphics Dissertation Onlin
Allocution à l'occasion du décès de M. Georges Straka, correspondant français de l'Académie
No full textMarcadé Jean. Allocution à l'occasion du décès de M. Georges Straka, correspondant français de l'Académie. In: Comptes rendus des séances de l'Académie des Inscriptions et Belles-Lettres, 138ᵉ année, N. 1, 1994. p. 41
Allocution à l'occasion du décès de M. Georges Straka, correspondant français de l'Académie
No full textMarcadé Jean. Allocution à l'occasion du décès de M. Georges Straka, correspondant français de l'Académie. In: Comptes rendus des séances de l'Académie des Inscriptions et Belles-Lettres, 138ᵉ année, N. 1, 1994. p. 41
Lasioglossum (Ctenonomia) dracaenae Pauly & Straka 2017, sp. nov.
No full textLasioglossum (Ctenonomia) dracaenae Pauly & Straka sp. nov. (Figs 69–77) Material examined. HOLOTYPE: ♀, ‘ YEMEN, SOCOTRA ISLAND / HOMHIL protected area / open woodland with Boswellia & / Dracaena trees; 10.-11.vi.2012 / 12°34.5’N, 54°18.5’E, 360-500 m // SOCOTRA Expedition 2012 / J. Bezděk, J. Hájek, V. Hula, / P. Kment, I. Malenovský, / J. Niedobová & L. Purchart leg.’ (NMPC). PARATYPES: Socotra: Hadibo, 1 ♀, 21.ii.1953, G. Popov lgt. (BMNH); Wadi Ayhaft, 200 m, 12°36.5′N, 53°58.9′E, 1 ♀, 7.–8. xi.2010, J. Batelka lgt.; Dixam Plateau, Firmihin, Dracaena forest, 490 m, 12°28.6′N 54°01.1′E, 1♀, 15.–16.xi.2010, J. Batelka lgt. (all in NMPC). Description. Female. Relatively large species: total body length 8.0 mm, forewing length 6.5 mm, intertegular distance 2.05 mm. Body black, metatibia, meso- and metatarsus orange, terga II and III with white basal bands of tomentum, and base of apical depression of tergum IV with fine transverse tomentum (Figs 69, 70). Head almost as long as wide (length / width = 0.94) (Fig. 72). Measurements (mm): length of clypeus 0.45; clypeus apical width 0.68; lower interocular distance 1.20; upper interocular distance 1.35; clypeo-antennal distance 0.50; length of eye 1.65; interantennal distance 0.25; interocellar distance 0.48; ocellocular distance 0.35; antennocellar distance 0.78; antennocular distance 0.43. Mandibles black, brown reddish in centre. Labrum black to brown. Clypeus with large punctures half diameter apart basally and half to two diameters apart apically, interspaces between punctures shiny. Supraclypeal area prominent, with large and strong punctures, punctures half to two diameters apart, interspaces between punctures shiny, microsculptured or not. Frons densely punctate, punctures about half diameter apart, interspaces coarsely microsculptured, dull, medial ridge well developed in basal half. Paraocular area imbricately punctate, dull. Vertex narrow (Fig. 71), but gena thicker than eye, longitudinaly ridged ventrally. Ocelli of medium size. Scape black, flagellum black dorsally, ochraceous ventrally. Mesosoma. Dorsolateral angles of pronotum produced and carinate, with tomentum on dorsal area up to lateral tubercles. Scutum elevated and bilobed anteriorly, anteromedially impressed line, central part of scutum with smooth integument, punctation consisting of larger and finer punctures intermixed, punctures two to less than half diameter apart, interspaces shiny, lateral area of scutum densely punctate, interspaces microsculptured, dull (Fig. 73). Scutellum very sparsely punctate in centre, punctures numerous puncture diameters apart, interspaces glabrous, lateraly densely punctate, punctures posteriorly larger than laterally. Metanotum dull, coriaceous, covered with white tomentum. Mesopleura and hypoepimeral area coarsely rugose. Posterior side of propodeum with hexagonal carina. Dorsal propodeal area plicate or irregularly ridged over its entire surface, interspaces between ridges slightly shiny (Fig. 74). Legs. Protarsi, inner face of protibias, meso- and metatarsi orange. Inner calcar of metatibia with three long teeth (Fig. 75). Scopa of hind leg pale orange. Wings relatively short, not exceeding apex of metasoma. Membranes hyaline. Stigma and veins brown. Tegula dark brown. Metasoma. Whole tergum I densely microsculptured, tessellated, dull, fine punctures developed, but ill-defined and scattered on sides and sloping base, punctures about one to three diameters apart, apical depression slightly impressed, without punctures, but with same microsculpture, dull (Fig. 76). Terga II–III with similar dull sculpture as on tergum I. Tergum IV more coarsely punctured and more finely microsculptured than preceding terga. Apical depressions of terga I–IV developed. Base of terga II–III with narrow and entire white band of tomentum (Fig. 77). Base of apical depression of tergum IV with fine transverse tomentum in fresh specimen (paratype), in others indistinct. Dense setae on terga V and VI light brown to pale orange. Sterna brown, with pale orange plumose and rather long setae. Male unknown. Differential diagnosis. This new species belongs to the Palaeotropical subgenus Ctenonomia Cameron, 1903 based on the weakened distal wing venation, the second submarginal crossvein as strong as the first, the pectinate inner hind tibial spur, the posterior surface of propodeum surrounded by hexagonal carina. It belongs to the group of large Ctenonomia such as Lasioglossum nairobicum (Cockerell, 1945) of sub-Saharan Africa and L. albescens (Smith, 1853) of the Oriental Region. From L. nairobicum it differs in the orange coloration of the hind leg, from L. albescens in the angles of propodeum covered with rugose wrinkles (smooth or microsculptured in L. albescens). Etymology. Named after one of the most striking plants of Socotra, the dragon’s blood tree (Dracaena cinnabari), as this bee was collected in a woodland with Dracaena. ‘Dragon’s blood’, the resin of this tree has been used as dye, since antiquity. Noun in apposition in genitive case. Remarks. The species resembles the Afrotropical species more than the Oriental ones, thus we suspect Ethiopian origin of the species. Distribution. Endemic to Socotra.Published as part of Straka, Jakub, Batelka, Jan & Pauly, Alain, 2017, Bees of the Socotra Archipelago (Hymenoptera: Anthophila), their biogeography and association with parasites, pp. 183-219 in Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) (Acta. Ent. Mus. Natl. Pragae) 57 on pages 202-204, DOI: 10.1515/aemnp-2017-0118, http://zenodo.org/record/532421
AMČR - projekt M-201700494
No full textStav: 6Podnět: Hluk, Straka, kabel NNOznačení projektu: 2017_08 - Hluk - Hluboká - Straka N
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