Search results

1

Dynamics simulation studies on the electric city car with an electromechanical differential and the rear wheels drive

100%

Kozłowski M., Choromański W.

Bulletin of the Polish Academy of Sciences: Technical Sciences

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2013

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issue 3

2

Structural Studies of C-Ni-Pd Nanocomposite Films Deposited on Al₂O₃ Substrate

81%

Kozłowski M., Czerwosz E., Sobczak K., Kurowska B.

Acta Physica Polonica A

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2017

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vol. 131

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issue 5

1409-1412

EN

The properties of nanocomposite carbon-nickel-palladium (C-Ni-Pd) films deposited on Al₂O₃ substrate have been investigated and the results are presented in this work. C-Ni-Pd films were obtained by a 3 step process consisting of PVD/CVD/PVD methods. The structure and morphology of the obtained films were characterized by scanning electron microscopy and transmission electron microscopy techniques at various stages of film formation. Energy dispersive X-ray spectrometer was used for measuring the elements segregation in the obtained film. Transmission electron microscopy and scanning transmission electron microscopy observations have shown carbon nanotubes decorated with palladium nanoparticles in the final film. The average size of the palladium nanoparticles did not exceed 10 nm.

3

The Influence of Substrate on Size of Pd Nanoparticles in C-Pd Composites Obtained in the PVD and CVD Processes

81%

Sobczak K., Kozłowski M., Czerwosz E.

Acta Physica Polonica A

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2017

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vol. 131

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issue 5

1413-1416

EN

This paper presents the results of research of C-Pd composite films obtained by the physical vapor deposition and chemical vapor deposition method. These films will be applied as hydrogen sensors. It has been examined whether the substrate has an impact on morphology and topologies of the C-Pd composite and whether the thermal conductivity of the substrate has an impact on the average size of the Pd nanoparticles. Substrates such as Al₂O₃, SiO₂, Si, and Mo were used, and in the physical vapor deposition process fullerene (C₆₀) and palladium acetate were deposited. Some of the samples were examined microscopically, while another part was modified in the chemical vapor deposition process in the presence of xylene. It was found that the average size of the Pd nanoparticles prepared in the physical vapor deposition process is independent of the substrate for all of the substrates used in the present experiment. During the chemical vapor deposition process an increase of the size of the Pd nanoparticles was observed - as expected. What is more, we noticed a weak relation between the size of the Pd nanoparticles and the type of substrate on which the C-Pd composite was deposited.

4

Analysis of dynamic properties of the PRT vehicle-track system

81%

Kozłowski M., Choromański W., Kowara J.

Bulletin of the Polish Academy of Sciences: Technical Sciences

|

2015

|

issue 3

5

Chemically Modified Activated Carbons as Catalysts of Oxidative Dehydrogenation of n-Butane

81%

Malaika A., Wower K., Kozłowski M.

Acta Physica Polonica A

|

2010

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vol. 118

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issue 3

459-464

EN

Commercial availability and low price of light alkanes make them very attractive in many branches of industry. Potentially interesting is their use in the process of oxidative dehydrogenation leading to production of olefins. This study was undertaken to characterise the oxidative dehydrogenation of n-butane to 1,3-butadiene (important substrate in production of synthetic rubber and polyamides) taking place over the modified carbon catalysts obtained from peach stones precursor. The catalytic tests were performed in the temperature range 250-450°C at oxygen/n-butane ratio of 1:1. For the majority of the activated carbon samples studied at the lowest temperature the only product was CO_2. At 300°C the products of dehydrogenation of n-butane and side products appeared. With increasing temperature the amount of compounds generated increased and in the group of C4 hydrocarbons the dominant were 1-butene and 1,3-butadiene. The most effective catalyst was the sample oxidised with air, the least effective was the sample modified with ammonium peroxydisulphate.

6

Role of extracellular matrix and prolactin in functional differentiation of bovine BME-UV1 mammary epithelial cells

81%

Kozłowski M., Gajewska M., Wilczak J., Motyl T.

Polish Journal of Veterinary Sciences

|

2011

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issue 3

7

Preparation and Some Properties of Carbon Nanotubes

71%

Byszewski P., Ukalski K., Baran M., Dlużewski P., Kozłowski M.

Acta Physica Polonica A

|

1995

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vol. 87

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issue 4-5

885-891

EN

Carbon nanotubes can be grown in the DC electric arc, they grow covered by a turbostratic graphite. The mechanism of the tubes growth is discussed. The magnetic susceptibility of samples, which contained aligned nanotubes exhibits anisotropic oscillatory behavior, which is ascribed to spatial quantization of the energy levels.

8

Groups of Paramagnetic Centres in Reduced and Methylated Low Rank Coal

71%

Pilawa B., Wachowska H., Kozłowski M., Więckowski A., Najder-Kozdrowska L.

Acta Physica Polonica A

|

2015

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vol. 128

|

issue 3

264-267

EN

Low rank Illinois No. 6 coal was studied by electron paramagnetic resonance EPR spectroscopy. The parameters of EPR spectra (spectroscopic splitting factors g, linewidths ΔB_{pp}, concentrations of paramagnetic centres N) were measured for row and chemically treated coal (demineralized, reduced and methylated samples). The multi-component structure of experimental spectra of this coal was proved. Two groups of paramagnetic centres responsible for broad Lorentzian 1 and narrow Lorentzian 2 lines exist in studied samples. Paramagnetic centres connected with component lines revealed different behaviour during chemical treatments.

9

EPR Characteristics of Activated Carbon for Hydrogen Production by the Thermo-Catalytic Decomposition of Methane

62%

Więckowski A., Najder-Kozdrowska L., Rechnia P., Malaika A., Krzyżyńska B., Kozłowski M.

Acta Physica Polonica A

|

2016

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vol. 130

|

issue 3

701-704

EN

The electron paramagnetic resonance (EPR) method was used to characterize samples of activated coal before and after reactions of the catalytic decomposition of methane and ethanol at temperatures of 1023 K (750°C), 1123 K (850°C) and 1223 K (950°C). The EPR parameters: spectroscopic splitting factor g, peak-to-peak linewidth ΔBₚₚ, and spin concentration c were measured. During the ethanol-assisted catalytic decomposition of methane carbon-located-spin radicals are partially transformed into oxygen-located-spin radicals.

10

Electron Microscopy and X-ray Structural Investigations of Incommensurate Spin-Ladder Sr_{4.1}Ca_{4.7}Bi_{0.3}Cu_{17}O_{29} Single Crystals

52%

Dłużewski P., Pietraszko A., Kozłowski M., Szczepańska A., Górecka J., Baran M., Leonyuk L., Babonas G.-J., Lebedev O., Szymczak R.

Acta Physica Polonica A

|

2000

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vol. 98

|

issue 6

729-737

EN

Transmission electron microscopy and X-ray diffraction proved chain ladder incommensurate single crystal structure of investigated samples. The incommensurate ratio was determined from the X-ray and electron diffraction being equal to 0.704. Diffuse scattering intensities localised on the planes perpendicular to the c*-axis and passing through the spots originating from the periodicity of chain sublattice were detected. High-angle grain boundary or twinning formed by rotation of 33.3° around [100] direction was observed. High-resolution electron microscopy images revealed the stacking faults in ac planes.

Refine search results

Dynamics simulation studies on the electric city car with an electromechanical differential and the rear wheels drive

Structural Studies of C-Ni-Pd Nanocomposite Films Deposited on Al₂O₃ Substrate

The Influence of Substrate on Size of Pd Nanoparticles in C-Pd Composites Obtained in the PVD and CVD Processes

Analysis of dynamic properties of the PRT vehicle-track system

Chemically Modified Activated Carbons as Catalysts of Oxidative Dehydrogenation of n-Butane

Role of extracellular matrix and prolactin in functional differentiation of bovine BME-UV1 mammary epithelial cells

Preparation and Some Properties of Carbon Nanotubes

Groups of Paramagnetic Centres in Reduced and Methylated Low Rank Coal

EPR Characteristics of Activated Carbon for Hydrogen Production by the Thermo-Catalytic Decomposition of Methane

Electron Microscopy and X-ray Structural Investigations of Incommensurate Spin-Ladder Sr_{4.1}Ca_{4.7}Bi_{0.3}Cu_{17}O_{29} Single Crystals