Reflection and transmission of elastic waves at viscous liquid/micropolar elastic solid interface
Amplitude ratios of various reflected and transmitted elastic waves from a plane interface separating a viscous liquid half-space and a micropolar elastic solid half- space, are obtained in two cases (i) when longitudinal wave propagating through the solid half-space is made incident at the interface and (ii) when "coupled-wave" propagating through the solid half-space is made incident at the interface. These amplitude ratios have been computed numerically for a specific model and results obtained are presented graphically. It is found that these amplitude ratios depend on the angle of incidence of the incident wave and the effect of viscosity of the liquid on amplitude ratios is noticed. The problem studied by Tomar and Kumar (1995) has been reduced as a special case of our problem.
Reflection and refraction of plane waves at an interface between micropolar elastic solid and viscoelastic solid
Abstract An infinite medium consisting of two semi-infinite half-spaces in welded contact is considered. The half-space in which the plane harmonic attenuating P- or SV-wave is incident, is assumed to be a linearly viscoelastic solid. The second half-space, in which the waves are transmitted, is assumed to be a micropolar elastic solid. The amplitude ratios for the different reflected and refracted waves have been calculated theoretically. Numerical values of the amplitude ratios have been computed and plotted against the angle of emergence for different values of frequency ratio ( ω 2 / ω 2 0 ). The numerical computations reveal that the amplitude ratios of reflected and refracted waves depend on the angle of emergence and frequency of the incident wave.
Frequency selective surface design for blinds applications
In this paper, the reconfigurable blind structure with frequency selective surfaces(FSS) for the building applications are presented. Frequency transmission characteristics for different angles of the proposed blind-FSSs are investigated and verified through simulation and measurement. The simulation results show that we can implement the reconfigurable blind-FSS for multiband wireless applications. To verify the proposed paper, two kinds of blind-FSSs, crossed dipole FSS and circular ring FSS are fabricated and measurements are performed for different angles. The proposed structure in this paper which is very simple, can be easily applied to any planar surface for wireless security applications at low cost.