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1
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Surfaces of Нigh-Tс Superconductors Studied by Means of the Scanning Tunneling Microscope

100%
Witek A., Ornoch L., Dąbkowski A., Raułuszkiewicz J., Institute of Physics P. A. o. S.
Acta Physicae Superficierum
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1990
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vol. 2
EN
Observations of the natural surface of BiSrCaCu₂Oₓ sintered ceramics applying the scanning tunneling microscope are reported. Measurements were performed in air at room temperature. It can be deduced from the surface images, on which the growth steps are visible with heights corresponding to the dimension of the unit cell along the c-axis or its multiples, that the bulk orthorhombic structure extends to the surface. The surface investigated is rather clean, inert and metallic in nature. It can be identified as the Bi-O layer.
2
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Crystallization of Amorphous Ribbon Observed by Means of Scanning Tunneling Microscope

100%
Witek A., Reich A., Raułuszkiewicz J., Zych W.
Acta Physica Polonica A
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1993
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vol. 83
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issue 4
463-467
EN
Surfaces of amorphous ribbon Fe70V10 B20 were observed by means of the scanning tunneling microscope before and after the annealing in vacuum. The topographic images of the air-side surfaces after annealing are similar in the x-y plane and different in the z-direction. From the scanning tunnelling microscope images some information on the crystallization of amorphous ribbons can be deduced.
3
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Fabrication and characterization of composite materials based on porous ceramic preform infiltrated by elastomer

100%
Chabera P., Boczkowska A., Witek A., Oziębło A.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2015
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issue 1
4
Content available remote

Surface of BiSrCaCuO Single Crystal Observed by Means of Scanning Tunneling Microscope

88%
Witek A., Reich A., Czajka R., Pajączkowska A., Rauluszkiewicz J.
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issue 5
717-722
EN
The topographic images of a Bi_{0.7}Pb_{0.3}SrCaCu_{1.8}O_{x} single crystal were studied by means of the scanning tunneling microscope. The structure of terraces and steps seen on the surface reflects the crystallographic structure of bulk.
5
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An Experimental Investigation of Electrical Conductivity of Y₃Al₅O₁₂-Ethylene Glycol Nanofluids

88%
Fal J., Witek A., Gizowska M., Cholewa M., Żyła G.
Acta Physica Polonica A
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2017
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vol. 132
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issue 1
149-151
EN
Paper presents results of experimental studies of electrical conductivity of yttrium aluminum garnet-ethylene glycol (Y₃Al₅O₁₂-EG, YAG-EG) nanofluids, which were prepared by dispersing commercially available nanoparticles manufactured by Baikowski (Annecy, France, ID LOT: 18513) in ethylene glycol. The electrical conductivity was measured using conductivity meter MultiLine 3410 (WTW GmBH, Weilheim, Germany). In turn the temperature was stabilized in a water bath MLL 547 (AJL Electronic, Cracow, Poland). The electrical conductivity of YAG-EG nanofluids with various mass concentrations form 5% to 20% was investigated at different ambient temperatures. The experimental data indicate that changing volume fraction of YAG nanoparticles in ethylene glycol cause change of electrical conductivity of nanofluid. It was also presented that electrical conductivity depends on temperature of materials.
6
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Dynamic Viscosity of Aluminum Oxide-Ethylene Glycol (Al₂O₃-EG) Nanofluids

88%
Żyła G., Fal J., Gizowska M., Witek A., Cholewa M.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2
240-242
EN
The paper presents the results of measurements of rheological properties of ethylene glycol (EG) based aluminum oxide (Al₂O₃) nanofluids. The nanofluids have been produced by two-step method with the use of commercially available nanoparticles. Dynamic viscosity curves and dependence of viscosity on temperature for these materials have been measured. It has shown that with higher concentration of nanoparticles in the suspension, these nanofluids exhibit the non-Newtonian flow and it can be considered as shear-thinning liquids. The effect of temperature on the dynamic viscosity in Al₂O₃-EG nanofluids can be modelled with the use of Vogel-Fulcher-Tammann expression.
7
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Electrical Properties of Aluminum Oxide-Ethylene Glycol (Al₂O₃-EG) Nanofluids

88%
Fal J., Żyła G., Gizowska M., Witek A., Cholewa M.
Acta Physica Polonica A
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2015
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vol. 128
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issue 2
153-155
EN
Nanofluids are suspensions of nanometrical size particles in a liquid base, which is usually water, oil or ethylene glycol. The potential practical use of nanofluids caused in recent years a considerable intensification of research into their properties. The most widely studied of physical properties include the fluid rheology, thermal conductivity and electrical parameters. The paper presents electrical properties of aluminium oxide (Al₂O₃) nanofluids based on ethylene glycol (EG). Nanoparticles used to produce nanosuspensions employed in measurements have size between 100-300 nm. Electrical properties was investigated in a wide range of temperatures (-10°C-55°C) and frequencies (0.02-200 kHz) using a measuring LCR bridge connected to a temperature stabilization system based on liquid nitrogen and Peltier element.
8
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A Fully Computerized Scanning Tunnelling Microscope

76%
Chwiałkowski M., Klusek Z., Kobierski P., Olejniczak W., Sławski M., Witek A.
Acta Physica Polonica A
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1993
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vol. 83
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issue 5
621-628
EN
A new, fully computerized and inexpensive, scanning tunnelling microscope was designed and built. Its key design feature is the application of the high sensitivity bimorph, for the coarse positioning of the bimorph is > 0.03 mm and can be divided up to the 12 bit number of steps. The bimorph positioning implies that this microscope is fully computer controlled, and using of bimorph instead of inch-worm implies low cost of the unit. The microscope can create images of the surface in the constant current mode and in the imaging current mode. The presented microscope works with the z-axis analog or digital feedback loop optionally. All parameters of the analog and digital feedback loop are computer controlled. Due to the digital z-axis feedback loop benefits, electron tunneling spectroscopy mode is naturally accessible. The performance of the microscope was tested in air by imaging of surface of HOPG (high oriented pyrolytic graphite).
9
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Comparison of numerical and experimental study of armour system based on alumina and silicon carbide ceramics

76%
Chabera P., Boczkowska A., Morka A., Kędzierski P., Niezgoda T., Oziębło A., Witek A.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2015
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issue 2
10
Publication available in full text mode
Content available

Numerical and experimental study of armour system consisted of ceramic and ceramic- elastomer composites

76%
Chabera P., Boczkowska A., Morka A., Niezgoda T., Oziębło A., Witek A.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2014
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issue 4
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