Wyniki wyszukiwania - Biblioteka Nauki

1

Upper Jurassic gravity mass flow deposit from the north margin of the Krzeszowice Graben

100%

Woźniak T.

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tom Vol. 40, no. 1

143--144

EN

In the whole Upper Jurassic succession in the vicinity of Cracow area gravity mass flow deposits are observed. They are represented mainly by debris-flows, grain-flows, and other gravity-flows, and were noted by Felisiak (1983), Koszarski (1995), Matyszkiewicz & Krajewski (1996), Matyszkiewicz (1996, 1997), Matyszkiewicz & 0lszewska (2007), Ziółkowski (2007). The studied quarry is situated in the vicinity of Tomaszowice, at the N margin of the Krzeszowice Graben, some 15 km NE of Krakow. The outcrop is about 30 m long and 9 m high. At the base of the outcrop, bedded limestone with cherts is exposed. The limestone is white, varying in shade, beds are 0.2-1 m thick, commonly contains cherts distributed along layer-parallel horizons and numerous dish-like and cup-shaped sponges occupying life position as well as microbial structures. The bedded limestone is overlain by a layer of greenish, plastic marl up to 15 cm thick. The marl rests on irregular top of bedded limestone with denivelation up to 1.5 m. The marl is followed by a 3 m thick layer of fragmental carbonate composed of irregularly distributed zones of massive clast-supported or matrix-supported fabric, which also contain abundant chert fragments. The clasts are irregular in shape and their maximum diameter reaches 0.4 m. The texture, structure and facies relations at Tomaszowice suggest sysnsedimentary origin of the fragmental limestone layer. Microfacies analysis indicates that the sediment at the base of the outcrop is developed as boundstone-wackestone. Siliceous sponges Hexactinellida & Lithistida, and microbial structures represented by thrombolites are the main constituents of boundstone that dominate in thin section. Tubiphytes and Terebella lapilloides are very common. Some of the sponges reveal borings filled by internal calcareous or ferrugineous sediment. The limestone clasts from the upper part of the outcrop are represented by boundstone-packstone, locally grainstone, both microfacies containing Tubiphytes, fragments of bivalves and siliceous sponges and Terebella lapilloides. Overturned sponges, microbial structures and geopetal fillings are common in larger boundstone clasts. Synsedimentary gravity mass flow deposits, like those observed in Tomaszowice outcrop, can be found near the northern margin of the Krzeszowice Graben (e.g. Matyszkiewicz 1996). This position suggests reactivation of a pre-existing fault zone within the underlying Palaeozoic bedrock, which occurred during the Oxfordian (Żaba 1999) as syndepositional deformation. Synsedimentary origin of these fragmental rocks, suggest the age of the margin at Tomaszowice may be dated at the Late Jurassic.

2

Dokładność serwisu EGNOS w kontekście obsługi operacji lotniskowych

51%

Felski A. , Woźniak T. , Zakrzewski P.

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tom R. 52 nr 1 (184)

31-44

PL

W artykule przedstawiono wyniki monitorowania rzeczywistych parametrów serwisu otwartego świadczonego przez system EGNOS od października 2009 roku. Monitoring ten prowadzono odbiornikami Septentrio PolaRx2e na lotniskach w Warszawie, Krakowie i Rzeszowie oraz różnymi odbiornikami morskimi w Gdyni. Zasadnicze spostrzeżenia można sprowadzić do tezy, iż uzyskiwana dokładność nie zależy od typu odbiornika, a błąd wyznaczeń nie przekracza dwóch metrów, jednak dostępność serwisu ciągle jeszcze nie jest zadowalająca.

EN

The paper presents the results of monitoring real parameters of the Open Service provided by EGNOS since October, 2009. The monitoring has been conducted with the receivers Septentrio PolaRx2e in the airports of Warsaw, Cracow and Rzeszów, and with different sea-receivers in Gdynia. The main finding is that the accuracy is not dependent on the type of the receiver, and the error of readings does not exceed 2 meters, however availability of the service is still not satisfactory.

3

3D blood vessels reconstruction based on segmented CT data for further simulations of hemodynamic in human artery branches

45%

Polańczyk A. , Strzelecki M. , Woźniak T. , Szubert W. , Stefańczyk L.

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tom Vol. 42, No. 4

359--371

EN

We aimed at the reconstruction of the branches of human aortic arch for blood perfusion analysis used later in the Computational Fluid Dynamic (CFD). The reconstruction was performed based on segmentation results obtained from CT data. Two segmentation algorithms, region growing and level set were implemented. Obtained binary segmentation results were next evaluated by the expert and corrected if needed. The final reconstruction was used for preparation of a numerical grid and for further calculation of blood hemodynamic. The collected data composed of blood velocity and blood flow rate in function of time were compared with USG-Doppler data. Results demonstrate that proposed algorithm may be useful for initial reconstruction of human cardiac system, however its accuracy needs to be improved as further manual corrections are still needed.