Wyniki wyszukiwania - BazTech

1

The Characterization of CuZnZrY Oxide Catalyst in the Steam Reforming of Methanol by EPR and XPS Spectroscopies

Skrzypek D., Krupa K., Talik E., Widuch S.

Polish Journal of Chemistry

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2007

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Vol. 81, nr 2

257-268

EN

In this paper we have developed the characterization of catalyst containing mainly CuO and ZnO with the addition of zirconium and yttrium oxides, using electron paramagnetic resonance (EPR) and X-ray photoelectron (XPS) spectroscopies. The obtained results support the stepwise reduction mechanism of Cu2+ ions. For the catalyst before the steam reforming of methanol reaction (SRM) the copper species were identified as isolated Cu2+ ions. The values of EPR parameters indicate the coordination of four oxygen atoms around Cu(II) in distorted axial configuration. For the catalyst after SRM reaction the EPR spectrum is complex and four types paramagnetic copper species (S1 - S4) could be identified. From theXPS results it is evident that the copper is in a reduced state in the catalyst after reaction. The fitting ofO1s spectrum proves the presence of hydroxide and carbonate anions apart from oxide surface phase. Combining the results of EPR and XPS methods it can be suggested that the S2 - S4 species are present on a surface.

2

Signature characteristic points determination by means of the IPAN99 algorithm

Doroz R., Widuch S.

Journal of Medical Informatics & Technologies

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2007

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Vol. 11

105--113

EN

The handwritten signature is often used for the identity confirmation. From the specialized graphic tablet, we receive the information in form of time strings. In this paper, the research results are presented which refer to the effect of applying the method of point detection of the highest curvature. Signatures are normalized by means of a DTW method, where two time strings representing the signature features are matched.

3

Blood cells analysis based on simple geometrical shape descriptors

Kocjan K., Kotarski W., Widuch S.

Journal of Medical Informatics & Technologies

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2002

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Vol. 3

MI207--212

EN

In the paper we present some results concerning application of simple shape parameters that are successfully used to distinguish between normal and pathological blood cells. All descriptors are based on shape area and its perimeter. We use five parameters that are automatically calculated for objects pointed out in the analyzed image with the help of our software. The experiments performed on the same set of tested images as in [3] let us draw the same conclusions as those reported in [3] where fractal analysis to shape has been used.

4

The method of preliminary medical images selection

Porwik P., Wróbel K., Widuch S., Doroz R.

Journal of Medical Informatics & Technologies

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2001

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Vol. 2, Part. 1

MI169--MI176

EN

This work investigates the use of some features computed using the Hough Transform as a criterion for image similarity evaluation based on picture retrieval. The method is based on a modified Hough Transform and used to approximate edges detected in the input image with straight lines. We consider retrieving images from a thematic database, where the semantic contents of images is limited to a specific domain (for example medical images). Proposed analysis of images does not claim that all features will be used, but special selection of features is well suited for evaluating of the visual coherence of images. In the first stage line elements are extracted from the image by using Hough Transform. In the second stage similarity coefficients are computed.

5

Shape analysis of blood cells based on fractal dimension

Kotarski W., Widuch S.

Journal of Medical Informatics & Technologies

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2001

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Vol. 2, Part. 1

MI177--MI182

EN

The paper presents some results concerning application of the fractal approach to analysis of shape of blood cells. Using the software by Kindratenko [4] the fractal dimension and other simple geometrical parameters of normal and pathological blood cells have been calculated. The investigation aproved that the fractal dimension and the perimeter of abnormal blood cells differ significantly from normal ones.

6

Wskazniki jakości sterowania sygnalizacją świetlną w systemie "OPTYMAL"

Doroz R., Wąsik R., Widuch S.

Zeszyty Naukowe. Transport / Politechnika Śląska

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2000

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z. 41

127-138

PL

Przedstawiono najczęściej stosowane wskaźniki umożliwiające ocenę jakości sterowania skrzyżowaniem ulic będącym jednym z krytycznych elementów sieci transportowej miasta, decydującym w dużym stopniu o jej przepustowości. Omówiono także nowy system komputerowego wyboru optymalnych harmonogramów sterowania sygnalizacją świetlną na skrzyżowaniu.

EN

The paper several aspects of simulation of the "OPTYMAL" package, developed in Institute of Transport. The quality factors of traffic control procedures have been discused in the paper as well.

7

System OPTYMAL : sterowanie sygnalizacją świetlną pojedynczego skrzyżowania ulic

Doroz R., Piecha J., Wąsik R., Widuch S.

Informatyka

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2000

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Nr 10

29-33

PL

Przedstawiamy wybrane aspekty sterowania sygnalizacją świetlną skrzyżowania ulic o dowolnym stopniu złożoności za pomocą narzędzia symulacji opracowanego w Instytucie Transportu Politechniki Śląskiej. Opracowania światowe dla systemów sterowania ruchem drogowym są z pewnością bardziej uniwersalne, niemniej ich cena znacznie przewyższa możliwości finansowe małych firm projektowych świadczących usługi w zakresie sterowania ruchem dla małych aglomeracji miejskich. Przedstawione rozwiązanie można również wykorzystać w celach szkoleniowych i jest dostępne u autorów opracowania bezpłatnie. Zainteresowanych prosimy o kontakt za pośrednictwem poczty elektronicznej (rw@polsl.katowice.pl).