It is known that hard planar acoustic screens generate null far-eld amplitude on the directions deened by the plane that encloses them. We proved in an earlier paper that this property actually characterizes plane screens among scatterers of any shape, and we generalized it to other boundary conditions. Furthermore it was proved that a single incident wave is suucient to distinguish screens tha...

We provide a background-independent formulation of the holographic principle. It permits the construction of embedded hypersurfaces (screens) on which the entire bulk information can be stored at a density of no more than one bit per Planck area. Screens are constructed explicitly for AdS, Minkowski, and de Sitter spaces with and without black holes, and for cosmological solutions. The properti...

Basic physical and mechanical properties of heatcover composition material that is used for making protective screens are experimentally investigated. For this purpose on the example flowed plastic STEF executed (with use traditional charts) research at small (less than 1 m/s) high (more 3 rate-of-change ladening. At speeds ladening durability was investigated superficial deformation, tension, ...