Abstract. Mechanical couple stresses modify at a microscopic level optical properties of some materials so they can display gyro-birefringence phenomena.The Optical Cosserat medium is defined and optical rotation tensor relative to couple stress is introduced. The generalized tensor of the dielectric permittivity is written for the Cosserat medium. Split of the plane-polarized light wave on passing through the Cosserat medium is shown and rotation of the azimuth of polarization is expressed by components of the couple stress tensor.
Abstract. An asymmetrical inter-atomic action, basic for a thermal couple stress presence, has been investigated in this work. A mechanical description of a Cosserat thermoelasticity is replaced by an equivalent magnetic representation. Then, a magnetization of a medium is analyzed. An experimental demonstration of the occurrence of the non-central load of the atom has been made applying the Electron Paramagnetic Resonance spectrometer. The mathematical model of the measurements has been presented in form of Bloch equations with extension to Cosserat medium.
Abstract. In this work, the Cosserat medium is analyzed as a set of atoms. These atoms are under the action of a mechanical load. The statistical analysis is preceded by a description of a single atom using classical mechanics and quantum mechanics. The behavior of the atoms in the field generated by mechanical change of the interatomic distance is shown as a phenomenon which can explain the Cosserat mechanics in a continuum..
Abstract. This work is a continuation of the investigation which first results were presented in the Bulletin of the Polish Academy of Sciences: Technical Sciences in 2009. In the work the Cosserat medium is defined there, where inter-atomic actions have non-central nature. Non-central potential energy is introduced. As regards the Schrödinger equation the energetic state of the atom is described in the field of the quantum mechanics. The analysis is carried out on the base of mechanical and magnetic properties of the atom. The obtained solution is applied to write the resonance condition in the EPR spectrometer. The spectra, obtained for a loaded hydrated copper sulfate, were interpreted from the point of view of the presented theory and experimental parameters of the Cosserat medium were written.
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