The Structure of Filter Curve and Methods of Its Approximation. Part 3. Equations for Filter Curve Approximation

The paper describes the structure of the filtration curve built in a wide range of variation of filtration rates. A detailed description of the mechanism of occurrence and development of the inertial component of the filtration flow structure is given. Equations are presented that can be used to approximate the filtration curve. A modified equation is proposed that provides a smooth transition from laminar to turbulent filtration without discontinuities of the velocity and pressure fields, which can be used when calculating both one-dimensional and spatial filtration flow.

Spatial filtration of the field at the interpretation of magnetotelluric data

Using numerical experiments, possibilities of application an analytical model to approximate spatial–temporal field variations on the Earth’s surface at interpretation of magnetotelluric sounding (MTS) data are considered.

Holographic Interferometer for the Study of Phase Media, Which Has Four Output Channels of Different Sensitivity

Computer simulation of the interferometer combining properties of low-sensitive Talbot interferometer and high-sensitive holographic interferometer is considered. The interferometer has four output channels having different sensitivity. Channel sensibility can be varied by means of spatial filtration. The base of the interferometer is the holographic Talbot effect. The efficiency of this interferometer was verified by computer simulation method. Some results of the computer simulation are presented in the article. These results were compared with results obtained in optical experiments under the same conditions. A wide range of sensitivity of the interferometer makes it possible to use the interferometer to study complex phase objects, primarily dynamic media.