Search

The method of particle shadow anemometry is one of the PIV modifications. LEDs are used as a radiation source. The application of particle shadow anemometry for diagnostics of low-speed vortex flows is considered in this article. The ability to obtain both visualization of the flow and numerical results was shown.

The dependences of the specific saturation magnetization sigma (C), magnetic ordering temperature TC(C), average hyperfine field H(C) and average isomer shift delta (C) on Si concentration are measured in crystalline Fe-Si alloys disordered by mechanical crushing. It is shown that topological disordering does not determine the magnetic properties. The peculiarities found are explained in terms of the local atomic structure parameters depending on the number of Si nearest neighbours of an Fe atom.

An analysis is made of the influence of amplitude distortions on the intensity distribution in the image of a diffuse object obtained in a randomly inhomogeneous medium assuming that the logarithm of the amplitude distortions is normally distributed. It is shown that the distortions in this distribution depend strongly on the parameter η = ρα2σ2/S (ρα and σ are the correlation radius and variance of the logarithm of the amplitude distortions; S is the area of the receiver aperture) and also on the resolution of the receiving equipment. This conclusion is confirmed experimentally.

An experimental investigation was made of the effect of high-power laser radiation on water drops of ~10–2 cm size. The drops disintegrated under the action of such radiation. The disintegration was of explosive nature and was attributed to boiling of strongly overheated water at isolated hot spots, which formed as a result of an inhomogeneous distribution of the optical field in a drop.