Wyniki wyszukiwania - BazTech

1

Structural And Optical Properties Of VOx Thin Films

Schneider K.

Archives of Metallurgy and Materials

|

2015

|

Vol. 60, iss. 2A

957--961

EN

VOx thin films were deposited on Corning glass, fused silica and Ti foils by means of rf reactive sputtering from a metallic vanadium target. Argon-oxygen gas mixtures of different compositions controlled by the flow rates were used for sputtering. Influence of the oxygen partial pressure in the sputtering chamber on the structural and optical properties of thin films has been investigated. Structural properties of as-sputtered thin films were studied by X-ray diffraction at glancing incidence, GIXD. Optical transmittance and reflectance spectra were recordedwith a Lambda 19 Perkin-Elmer double spectrophotometer. Thickness of the films was determined from the profilometry. It has been confirmed by XRD that the deposited films are composed mainly of V2O5 phase. The estimated optical band gap of 2.5 eV corresponds to V2O5.

PL

Cienkie warstwy VOx były nanoszone na szkło Corning metodą rozpylania magnetronowego rf. Jako katody użyto metalicznego wanadu. Były one nanoszone w komorze wypełnionej mieszaniną argonu i tlenu w różnych proporcjach przy ustalonych przepływach. Zbadano wpływ ciśnienia parcjalnego tlenu w komorze na własności strukturalne i optyczne otrzymanych warstw. Własności strukturalne cienkich warstw zostały określone metodą rozpraszania promieniowania rentgenowskiego padającego pod małymi kątami (GIXD). Widma optyczne transmitancji i odbicia zostały wykonane przy użyciu spektrometru Lambda 19 Perkin-Elmer. Grubość badanych warstw zmierzono za pomocą profilometru. Pomiary XRD potwierdziły, że otrzymane warstwy składają się głównie z fazy V2O5. Wyznaczona optycznie przerwa energetyczna wynosząca 2.5 eV odpowiada przerwie energetycznej V2O5.

2

Self-cleaning layers of TiO2 on the brick surfaces

Komornicki S., Rekas M., Schneider K., Wyrwa J.

Materiały Ceramiczne

|

2013

|

T. 65, nr 2

130--134

EN

A deposition method of TiO2 layers on the surface of commercial bricks has been proposed. X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy ( EDS) were used to determine chemical and phase compositions as well as microstructure of the fabricated layers. In spite of high temperature heating, comparable to that needed to firing raw bricks (above 1000 °C) the deposited TiO2, as the rutile phase, remains on the brick surface, and then it is enable to photocatalytic degradation of typical contaminants of the building surface playing role of a self-cleaning agent.

PL

Opracowano metodę formowania warstw TiO2 na powierzchni cegieł. Dyfrakcyjna analiza rentgenowska (XRD), elektronowa mikroskopia skaningowa (SEM) oraz rentgenowska mikrosonda (EDS) zostały użyte do określenia składu chemicznego i fazowego oraz mikrostruktury naniesionych warstw. Pomimo warunków wysokotemperaturowego wygrzewania, porównywalnego do tych jakie stosowane są podczas wypalania surowych cegieł (powyżej 1000 °C), nałożone warstwy TiO2 w formie rutylu, pozostają na powierzchni cegieł i są w stanie degradować typowe zanieczyszczenia, na drodze fotokatalitycznych procesów, na powierzchni budynków, pełniąc rolę warstw samoczyszczących.

3

The BDD Space Complexity of Different Forms of Concurrency

Baldamus M., Schneider K.

Fundamenta Informaticae

|

2002

|

Vol. 50, nr 2

111-133

EN

The automated verification of concurrent systems by model checking is often confronted with the state space explosion problem. A widely adopted method to tackle this problem is to use binary decision diagrams (BDDs) for representing systems and state spaces implicitly. However, it may be that even the system representation itself is prohibitively large. It is therefore interesting to study which factors influence the size of a BDD that represents the transition relation of a system. In this article, we consider the BDD representations of synchronous, asynchronous, and interleaved processes with communication via shared variables and present upper bounds for their sizes. To this end, we introduce a general representation strategy where catastrophic exponential growth of the BDD can only be due to the specifics of communication and/or write conflict resolution; it is neither due to the number of processes nor to the concurrency discipline. Moreover, conditions on communication and write conflict resolution are presented that are sufficient for polynomial sized BDD representations.

4

Urządzenie do zestawiania filmów i obwodu drukowanego z bazowaniem optycznym

Schneider K., Wocianiec R.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

|

2001

|

z. 70

109-114

PL

W arykule przedstawiono: postać, fragmenty rozwiązań konstrukcyjnych, działanie urządzenia do zestawiania filmów i obwodu drukowanego będącego fragmentem naświetlarki do obwodów drukowanych.

EN

Paper presents idea, some construction details and function of the device for aligning films and printed circuit board panels. Described device was designed as a module of exposure machine.

5

Efficiency of a 252Cf source in normal or in B-10 enriched lymphocytes evaluated by SCGE assay, classical cytogenetics and FISH technique

Cebulska-Wasilewska A., Niedźwiedź W., Florjan D., Schneider K., Kopec M., Kreft A.

Nukleonika

|

2001

|

Vol. 46, nr 2

41-49

EN

Biological effectiveness of a californium-252 source was evaluated after irradiations in vitro of normal or pretreated cells with compound enriched in the B-10 ion (Na210B12H11SH also known as BSH) in order to check the possibility of any enhancement effect due to the process of boron neutron capture. Peripheral blood lymphocytes were used as a model for human cells. Human blood samples or isolated lymphocytes were irradiated with the isotopic source of 252Cf, at the Faculty of Physics and Nuclear Techniques at the University of Mining and Metallurgy, Kraków, (both the neutron source and the samples were placed in an "infinite" polyethylene block). DNA and chromosomal damage were studied to compare the biological effectiveness of irradiation. Single cell gel electrophoresis also known as the Comet assay was done to investigate the DNA damage. Classical cytogenetic analysis was applied to assess the frequencies of unstable aberrations (dicentrics, rings and acentric fragments). To evaluate the frequencies of stable aberrations the fluorescence in situ hybridisation (FISH) with probes for chromosomes 1, 4 (14,3% of the whole genome) was performed. Linear (or close to linear) increases with radiation doses were observed for the DNA damage and aberration frequencies in lymphocytes both untreated or pretreated with BSH. Levels of translocations evaluated for the whole genome were comparable with the frequencies of dicentrics and rings. No significant differences were detected due to radiation dose in the frequencies of sister chromatid exchanges (SCE) detected in the second mitosis. Statistically no significant differences were observed in various biological end-points between normal or boron pre-treated cells.

6

Biological efficiency of the Brookhaven Medical Research Reactor mixed neutron beam estimated from gene mutations in Tradescantia stamen hair cells assay

Cebulska-Wasilewska A., Schneider K., Capała J., Coderre J.

Nukleonika

|

2000

|

Vol. 45, nr 2

115-119

EN

The relative biological effectiveness of low energy neutrons for the induction of various abnormalities in Tradescantia stamen hair mutation (Trad-SH) assay was studied using two clones (T-4430 and T-02), heterozygous for flower color. Dose response relationships for gene mutations induced in somatic cells of Trad-SH were investigated after irradiation with a mixed neutron beam of the Brookhaven Medical Research Reactor (BMRR), currently used in a clinical trial of boron neutron capture therapy (BNCT) for glioblastoma. To establish the RBE (relative biological effectiveness) of the BMRR beam in the induction of various biological end-points in Tradescantia, irradiation with various doses of g-rays was also performed. After irradiation all plants were cultivated several days at Brookhaven National Laboratory (BNL), the transported to Poland for screening the biological end-points. Due to the post-exposure treatment, all plants showed high levels of lethal events and alteration of the cell cycle. Plants of clone 4430 were more reactive to post-treatment conditions, resulting in decreased blooming efficiency that affected the statistics. Slope coefficients estimated from the dose response curves for gene mutation frequencies allowed the evaluation of ranges for the maximal RBE values of the applied beam vs. g-rays as 6.0 and 5.4 for the cells of T-02 and T-4430, respectively. Estimated fraction of doses from neutrons and corresponding biological effects for the clones T-02 and T-4430 allowed to evaluate the RBE values for neutrons part in the beam as 32.3 and 45.4, respectively.