Abstracts of papers for

Previous issue vol. 44, no. 2 (2003)

vol. 44, no. 3 (2003)

Next issue vol. 44, no. 4 (2003)

Contents of issue 3, vol. 44

1. V. Pauk, M. Woźniak: Frictional heating effects in the plane contact of layer and rigid flat punch
2. T. Zyss: Will the analysis of brain bioelectric signal allow for insight in other people's thoughts?
3. E. Radzikowska: Microstretch model of type II superconductors
4. J. Owsik, W. Skrzeczanowski, A. Długaszek, J. Janucki, M. Nowakowski, J. Pietrzykowski: Calibration of power and energy meters of laser radiation
5. E. Mrozek, P. Mrozek: Thin dielectric electrodiffusion masks for Ag⁺ - Na⁺ ion exchange applications
6. F. D. Zaman, K. Masood: Shear velocity inversion procedure for Love waves
7. V. B. Taranov, Z. J. Zawistowski: Electron plasma upper hybrid kinetic symmetries
8. R. Brojewski, J. Jasiński: About the properties of attraction sets of two models of physics of the atmosphere
9. S. Piekarski: On diffusion and thermodiffusion in a gravity field

V. Pauk, M. Woźniak: Frictional heating effects in the plane contact of layer and rigid flat punch

Thermal effects due to the frictional heating in sliding contact of a thermoelastic layer and a rigid insulated flat punch are investigated. The contact problem is treated by the Fourier integral transform method and is reduced to the system of singular integral equations which is solved numerically. Influence of the frictional heating on distributions of the contact pressure and generated temperature is presented for different values of thickness of the layer. Comparison with the corresponding results for a half-space is done.

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T. Zyss: Will the analysis of brain bioelectric signal allow for insight in other people's thoughts?

This paper describes common application of brain mapping and high resolution EEG techniques to identification of cognitive process in sensory cortical area of human brain.

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E. Radzikowska: Microstretch model of type II superconductors

The Eringen theory of microstretch electromagnetic elastic solids is applied to describe the behaviour of type-II superconductors interacting with a pinned dense vortex lattice. The electromagnetic, mechanical and thermal fields interactions in superconductors are considered. The electromagnetic interactions are described within the framework of the classical electrodynamics of microstretch elastic solids. The complete system of field equations is presented consisting of the balance laws, the constitutive relations and the jump conditions on the discontinuity surfaces. The linear magnetoelasticity equations of microstretch superconductors are presented.

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J. Owsik, W. Skrzeczanowski, A. Długaszek, J. Janucki, M. Nowakowski, J. Pietrzykowski: Calibration of power and energy meters of laser radiation

The paper presents a project of calibration chain used in metrology of laser radiation. A method of reproduction and sequence of transfer of the units of laser radiation from primary standard to measuring instruments of these physical values are described, and uncertainties of measurement as well as fundamental inspection methods are shown. Schemes, principles of reproduction and transfer of the units of power and energy as well as basic metrological characteristics of the links of calibration chain are proposed.

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B. E. Mrozek, P. Mrozek: Thin dielectric electrodiffusion masks for Ag⁺ -- Na⁺ ion exchange applications

A new method of thin dielectric mask preparation for Ag⁺ - Na⁺ ion exchange applications was developed. Electrodiffusion bonding of Al-film to glass was used to obtain very thin dielectric Al₂O₃ layer in the Al-glass transition zone. After Al removal, the quality of the dielectric mask was tested in Ag pure thermal diffusion and electrodiffusion processes in molten AgNO₃.

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F.D. Zaman, K. Masood: Shear velocity inversion procedure for Love waves

An inverse solution is presented to the seismic inverse problem for one-dimensional shear velocity variations. The Love waves, travelling in a layer overlying a half-space incident upon delta-function potential, are considered. The equation of motion for Love waves is transformed to the Schrödinger equation and then the potential is recovered by applying Gelfand-Levitan and Marchenko procedure.

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V. B. Taranov, Z. J. Zawistowski: Electron plasma upper hybrid kinetic symmetries

Symmetry group of integro-differential equations describing nonlinear upper hybrid waves in magnetized electron plasma is found. It is shown that the extension of the symmetry in the cold plasma limit allows us to build the general solution in this case.

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R. Brojewski, J. Jasiński: About the properties of attraction sets of two models of physics of the atmosphere

Dynamical properties of two simple models derived from the equations of physics of the atmosphere are investigated in this paper. Attention was paid to the structure of attraction sets (especially to their borders) of the attractors existing in the models. The influence of precision of the integrating procedures' on some of the attractors identification was investigated. The mechanism of destroying a strange attractor (by the nonlinear resonance) in a Lorenz system with thermal forcing was found.

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S. Piekarski: On diffusion and thermodiffusion in a gravity field

The modified Fick law has been introduced in the paper: S. Piekarski, On the modified Fick law and its potential applications (J. Tech. Phys., 44, 2, 125-131, 2003). The first purpose of the present paper is to give a simpler "derivation" of the modified Fick law than that originally presented. Namely, it can be introduced as a particular case of the Wojnar equation (R. Wojnar, "Nonlinear heat equation and thermodiffusion", p. 296, Eq. (2.1), Rep. on Math. Phys., No 1/2, Vol. 46, 2000). The third equation discussed is the Einstein-Smoluchowski equation. All equations mentioned above, contain a potential for the force, acting on the diffusing matter. The important fact is that, for isothermal conditions, all the equations mentioned above are identical. In this article we try to describe the effects of the constant gravitational field on the diffusion processes. We propose an explicit form of the potential for which the equilibrium concentration profiles are consistent with the experimental results. We compare shortly our results with two models of the diffusion processes in a gravitational field described in Huang's book [8] as well as with other opinions concerning this subject. As an example of technological application of the presented theory, the diffusion of the atomic hydrogen in fluid iron is proposed.

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