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1
Content available remote Universality of the 2D wetting transition with respect to long-range forces
100%
Drzewiński A. , Parry A. O. , Szota K.
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2007
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tom Vol. 6, nr 1
57-63
EN
Effective Hamiltonian models predict non-universal critical singularities for two-dimensional wetting transitions with long-ranged forces. We verify these predictions by studying delocalization transitions in an infinitely long Ising strip, of width L (lattice spacings), with long-ranged surface fields that have opposite sign at each surface. The extrapolated asymptotic value for the exponent β:s does not confirm to the predicted non-universality but instead approaches the same universal value representative of systems with short-ranged forces. The crossover of the scaling behaviour of the transition lines is presented. Moreover, contrary to the existing predictions, the critical wetting transition for p = 2 has been found.
2
Content available remote Determination of chemical composition and structure of YBa2Cu3O7-x – YBCO/Cu 2G HTS superconducting tape
88%
Jędryka J. , Szota M. , Nabiałek M. , Szota K. , Łukaszewicz A.
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tom Vol. 70, nr 1
14--20
EN
Purpose: The paper concerns the determination of the chemical composition and structure of high-temperature superconducting tapes YBa2Cu3O7-x– YBCO/Cu 2G HTS. Design/methodology/approach: Studies were carried outusing a scanning electron microscope with a chemical composition analyser on prepared samples of a tape. Moreover, an abrasion resistance test which shown resistance to friction at 1, 2 and 3 hours by using ball-tester was carried out. The individual layers which are components of the test tape and depths of wipes which appeared after test on ball-tester were evaluated. Findings: Studies showed a lot of information about abrasion resistance of tapes. Hourly friction, using ceramic ball did not result in breakthrough coating. The investigation are carried out for one, two and three hours. They also confirmed the chemical compositions provided by the manufacturer, as well as describe the individual layers of examined superconducting tapes. Originality/value: Detailed studies in particular, on wear resistance of superconductors, which relate to the chemical composition of the tapes, and their construction carried out in the context of the article, may be a prelude to further research into the production of superconducting tapes that will show much greater resistance to abrasion. The essence of the problem is a construction base, in particular during the installation of such tapes, for example in the form of a transformer winding.
3
Content available remote Percolation with a barier in finite systems
88%
Drzewiński A. , Klimek M. , Kośmider M. , Pasternak K. , Szota K.
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tom Vol. 9, nr 2
37-41
EN
The site percolation, where the long-range connectivity is the result of the occupancy probability defined on a site, is studied on the L×L square lattice. Method of determining of the location of the percolation pseudo-threshold pc(L) is proposed and the influence of a barrier on the percolation pseudo-threshold is analysed.
4
Content available remote Thermal analysis of SF12050 high temperature superconducting tape
88%
Jędryka J. , Szota M. , Nabiałek M. , Szota K. , Łukaszewicz A.
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tom Vol. 69, nr 1
25--31
EN
Purpose: The paper deals with the determination of the impact and the possibility of heat treatment in order to improve the properties of YBa2Cu3O7-x- YBCO 2G HTS high-temperature superconducting tapes. Design/methodology/approach: Test samples of SF12050 superconducting tape, subjected to heat treatment - annealing in the temperature range of 450-1000°C. Two types of cooling were used on the air and with the furnace. Thus prepared samples were subjected to differential scanning calorimeter DSC - TG NETZSCH STA 409C.Results:The analysis was also subjected to the influence of temperature on the consistency of the protective layer with the other components of the tape, and a mechanism for destruction of the tape as a result of the impact of elevated temperatures. The paper also contains images of selected sections of the SF12050 superconducting tape which were preheated in the temperature range of 450-1000°C. Originality/value: Research carried out in the context of the article, made it possible to trace the influence of temperature on the destruction of superconducting tapes. Those studies show the destructive effects that may occur when using the type of tape, in particular as regards their application in the form of windings in transformers. Detailed knowledge of the thermal degradation mechanism of superconducting tapes, may lead to a response on how to modify them in order to avoid the devastating effect of temperature during operation.
5
Ocena stanu skażenia mikrobiologicznego przypraw stosowanych w przemyśle mięsnym
75%
Szota K.
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nr 11
6
Opracowanie i wdrożenie solanek bekonowych z dodatkiem askorbinianu sodu
63%
Szota K. , Niedosug Z.
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nr 09
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