A. Usikov Institute of Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura Str., Kharkiv 61085, Ukraine
Basic Properties of Chiral Waveguides
Physical properties of mode behavior in a waveguide filled with chiral medium have been analyzed. Mathematical and physical models of mode propagation have been defined and the mode classification has been proposed. It was shown that modes of a chiral waveguide have the same root singularity in dispersion as a non-chiral waveguide. However the mode transfiguration that determines a complex behavior pattern of summary dispersive curves is typical for all modes of the chiral waveguide. The modes of chiral waveguides are characterized by polarization coupling, wave mode coupling, dispersive curve gushes, spatial beats and consecutive variations of an eigen function at the operating point moving along the dispersive curve (mode transfiguration). A polarization selection of propagated waves is realized in the chiral waveguide. Therefore when the propagation constant has high values there are only clockwise-polarized waves in the chiral waveguide; it is caused by the mode transfiguration.
Use of Structural Color Analysis of Graphic Images in Information Communication Systems
Mathematical Modeling of a Nonhomogeneous Integral Information Transmission System
Kharkiv National University of Radio Engineering and Electronics,
14, Lenin Ave, Kharkiv, 61166, Ukraine
Influence of Axial Approximation upon the Density of the States of Quantum-Dimensional Structures
Influence of the axial approximation on spectral characteristics is under discussion. The investigation is based on band structure computation using kp-method with the envelope function approximation. Such investigation is carried out for different quantum-size semiconductors with and without application of the axial approximation. As an result of the performed investigations it is shown that the axial approximation results in a high inaccuracy as compared with bulk semiconductors.
A. Usikov Institute of Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura Str., Kharkiv 61085, Ukraine
Nonstationary Spatial Structures, Slow Transient Processes, and Multistability under Weak Diffusion of Excitations in the Distributed Nonequilibrium Systems with Active Three-Level Centers
Self-organized space-time structures are numerically investigated in distributed active (excitable) systems. The origin, the evaluation, the interaction, and the decay of rotating spiral autowaves are studied in the framework of the generalized Wiener-Rosenblueth model. Slowing down of transient processes caused by the rotating spiral autowave evolution has been revealed. The multistability of coherent rotating spiral autowaves is demonstrated. The transient space-time chaos has been observed in an excitable three-level medium in the absence of coherent rotating spiral autowaves.
A. Usikov Institute of Radio Physics and Electronics,
National Academy of Sciences of Ukraine
12, Academician Proskura Str., Kharkiv 61085, Ukraine
Use of Dielectrometry in the Free Water Dispersion Region for the Express-Control of Combined Factors in Contaminating Water Bodies
The present paper outlines the results from the alive control of parameters of microalgae water regimen using the dielectrometry method in the free water dispersion region when the effects of different toxicants and biologically active agents are brought into play. The algae cell hydration parameters are shown to vary under the influence of inimical factors upon cells. These changes are taken to be basic in terms of developing sensitive biosensors for the express-control of combined factors of water bodies contamination by means of the mm-wave dielectrometry.