Metasurfaces that can realize the polarization manipulation of electromagnetic waves on sub-wavelength scale have become an emerging research field. Here, a novel strategy combining metasurface and Fresnel zone plate to form is proposed conversion from nearly arbitrary polarizations fixed polarization. Specifically, when one polarized wave incident adjacent ring zones constructed by different t...

Meng (1997) used the McConnell crosswell data to show that transmitted arrival traveltimes can be extracted from common receiver gathers (CRG) where the effective source is a tube wave generator. In this report I use the McElroy crosswell data to show that reflection events can be extracted from CRG’s where the effective source is a tube wave generator. This result opens the possibility that mo...

We present a technique for 3D imaging of live cells in translational motion without need of axial scanning of objective lens. A set of transmitted electric field images of cells at successive points of transverse translation is taken with a focused beam illumination. Based on Hyugens' principle, angular plane waves are synthesized from E-field images of a focused beam. For a set of synthesized ...

Brain injuries, such as stroke or trauma, induce neural stem cells in the subventricular zone (SVZ) to a neurogenic response. Very little is known about the molecular cues that signal tissue damage, even over large distances, to the SVZ. Based on our analysis of gene expression patterns in the SVZ, 48 hr after an ischemic lesion caused by middle cerebral artery occlusion, we hypothesized that t...

Many types of invisible electromagnetic waves are produced in our atmosphere. When these radiations penetrate our body, electric fields are induced inside the body, resulting in the absorption of power, which is different for different body parts and also depends on the frequency of radiations. Higher power absorption may result into health problems. In this communication, effects of electromag...

Recent numerical investigations of wave propagation near coronal magnetic null points (McLaughlin and Hood, 2006) have indicated how a fast MHD wave partially converts into a slow MHD wave as the disturbance passes from a low-β plasma to a high-β plasma. This is a complex process and a clear understanding of the conversion mechanism requires the detailed investigation of a simpler model. An inv...

A series of one-dimensional studies is presented to reveal basic aspects of momentum and energy transfer to plates in air blasts. Intense air waves are initiated as either an isolated propagating wave or by the sudden release of a highly compressed air layer. Wave momentum is determined in terms of the energy characterizing the compressed layer. The interaction of intense waves with freestandin...

The problem of oblique wave scattering of a Rayleigh wave by a cylindrical cavity in an elastic half-space is solved using the multipole expansion method. Whereas in the analogous water-wave problem a single scalar field is expressed as an infinite multipole expansion, and in the Rayleigh wave case with normal incidence two scalar fields suffice, here we require three coupled scalar multipole e...

The object of the fenestration operation is to overcome the obstruction offered to the transmission of sound-actuated waves by the fixation of the footplate of the stapes in the oval window by osteosclerotic bone. This is achieved by providing an opening in the wall of the bony labyrinth that will allow free movement of labyrinthine fluids in response to transmitted sound waves (Cawthorne, 1952...

The flow field produced by a shock wave reflecting from a helium gas-liquid interface was investigated using a cryogenic shock tube. Incident and reflected shock waves were observed in the gas; transmitted firstand second-sound shocks were observed in the liquid. Wave diagrams are constructed to compare the data with theoretical wave trajectories. Qualitative agreement between data and theory i...