We study the reflection and transmission coefficients of plane waves incident at an interface between two isotropic thermoelastic half spaces compare them with those elastic case. The models include classical-Biot (B) extended Lord-Shulman (LS) theories, predict reflected transmitted fast-compressional (P), thermal (T) shear (S) waves. are formulated in terms incidence inhomogeneity angles, med...

We study scattering of waves by impurities in strongly precompressed granular chains. We explore the linear scattering of plane waves and identify a closed-form expression for the reflection and transmission coefficients for the scattering of the waves from both a single impurity and a double impurity. For single-impurity chains, we show that, within the transmission band of the host granular c...

Video surveillance is needed to control many activities performed in underwater environments. The use of wired media can be a problem since the material specially designed for underwater environments is very expensive. In order to transmit the images and videos wirelessly under water, three main technologies can be used: acoustic waves, which do not provide high bandwidth, optical signals, alth...

How can our radios receive signals from stations beyond line of sight? One common mode transmission and reception radio waves is “skywave,” or ionospheric propagation. In skywave transmission, a station transmits medium high frequency (MF HF) away the Earth toward ionosphere, an atmospheric layer extending approximately 50-400 miles (approximately 80-640 km) above ground. The ionosphere gets it...

The reaction of different materials to external magnetic fields depends on the frequency propagation radio waves in substances and is determined by dielectric constant, permeability , vectors electric field. When irradiated with a flat wave surface, phenomenon occurs at boundary between two media, which will be described an algorithm through reflection transmission coefficients used processing ...

A comb-type floating breakwater is a new wave dissipation structure with particular force and performance advantages due to the two wave-reflecting surfaces. In this article, physical model experiments are used study hydrodynamic characteristics of fixed comb structural optimization-based measures under combined action regular waves, irregular currents. The effects factors such as relative widt...

Acoustic waves are generated by the convective motions in the solar convection zone. When propagating upwards into the chromosphere they reach the height where the sound speed equals the Alfvén speed and they undergo mode conversion, refraction and reflection. We use numerical simulations to study these processes in realistic configurations where the wavelength of the waves is similar to the le...

Multilayered structures consisting of alternating negativepermittivity and dielectric layers are explored to obtain high-resolution imaging of subwavelength objects. The peaks with the smallest |ky| (ky is the transverse wave vector) on the transmission curves, which come from the guided modes of the multilayered structures, can not be completely damped by material loss. This makes the amplitud...

The optical multimode interconnection technology has become important due to increasing data rates in modern multi-processor systems. In this context, the coupling of optical waves into multimode waveguides has to be analyzed. Ray optical methods are preferred, but are not applicable for all geometries. As full-wave analysis using the mode matching technique is very extensive, we present a simp...

Two forms of undulatory locomotion in the lamprey (a lower vertebrate) have been described earlier: fast forward swimming (FFS) used for long distance migrations and slow backward swimming (SBS) used for escape from adverse tactile stimuli. In the present study, we describe another form of escape behavior: slow forward swimming (SFS). We characterize the kinematic and electromyographic patterns...