Aim. The purpose of the paper is to systematize the results of theoretical and experimental studies on the flow of a gas suspension around a blunt body, including supercooled drops.
   Methodology. Computer modeling methods and experimental data are used in numerical calculations.
   Results. A classification of regimes of a flow around a blunt body by a gas suspension flow is presented. The results of applying various research methods depending on the characteristic dimensions of the body, drops and the Knudsen number are systematized in the form of a diagram. A region is found in the flow around the leading edge of the wing, where supercooled drops will not crystallize upon hitting the surface.
   Research implications. The results can be used in the modeling of icing and serve as a basis in the fight against this unfavorable phenomenon.

   Aim. The paper considers the rheological behavior of a magnetorheological fluid obtained on the basis of magnetite particles in an ionic liquid.
   Methodology. Use is made of an approzimation of the experimental data by the equations of the structural rheological model on separate intervals of the shear rate.
   Results. The relationship between the coefficients of rheological equations and the nature of the structure of a magnetite suspension in an external magnetic field is demonstrated.
   Research implications. Equations are proposed that are capable of approximating experimental data on separate intervals of the shear rate corresponding to a certain structural state of a magnetorheological fluid.

   Aim. The purpose of this work is to obtain CaF₂ and CaF_2:Pb₂ + single crystals of by the method of inertial gradient solidification of the melt in a stationary crucible at an excess pressure of an inert gas, as well as to study the features of the impurity distribution in single crystals obtained by this method.
   Methodology. Fluorite single crystals 140 x 25 x 20 mm in size of good optical quality are obtained from a strongly overheated melt in a stationary crucible in a heat-saving graphite unit of the horizontal directional solidification (HDC) growth unit by inertial cooling of the furnace. The absorption spectra of CaF₂ and CaF₂:Pb₂+ crystals grown by the spontaneous crystallization method and the standard HSM method by drawing at a rate of 5 mm/h in an argon atmosphere are studied.
   Results. Single crystals of CaF₂ and CaF₂ :Pb²⁺ obtained by the method of inertial gradient inertial gradient solidification of the melt in a stationary crucible at an excess pressure of argon are synthesized and studied. The conditions for the process of this type of crystallization are established. The features of the impurity distribution for a single crystal obtained by this method are studied.
   Research implications. Growth studies of doped crystals show that, in comparison with the classical HDC method, in the case of inertial gradient solidification of the melt, there is a more uniform impurity distribution along the length of the crystals. A conclusion is made about the features of creating gaseous atmospheres for growing fluoride crystals using the HSM technology.

   Aim. The purpose of the work is to validate the proposed mechanism of resonance dispersion for a "fine" and "deep" liquid by using the experimental results on laser ablation of metallic nanofilms published in the literature.
   Methodology. An analytical research method is used in the work, as well as the methods of wave physics and the theory of resonance dispersion.
   Results. As a result of the calculations, estimates of the most probable sizes of dispersion fragments and variances of their size distributions are obtained, which satisfactorily explain the experimental data.
   Research implications. The described dispersion mechanism makes it possible to advance in the study of some laser ablation regimes, which is of both theoretical and practical interest.

   Aim. The purpose is to reveal the features of the interaction of visible light with transparent inhomogeneities (droplets) in the atmosphere under isothermal conditions.
   Methodology. The intensity of the incident radiation is limited by the intensity of daylight. In this case, the interaction of radiation with a drop is limited by elastic scattering (Rayleigh scattering). Two limiting cases of the interaction of light with a drop are considered: the approximation of ray (geometric) optics and wave optics in the Rayleigh scattering approximation. This makes it possible to study the effect of droplet sizes on light scattering depending on the wavelength.
   Results. The dependence of scattering on the size of the droplet and on the entrance of radiation into the droplet is investigated within the limits of the beam optics and the accepted intensity. In the framework of Rayleigh scattering, the known dependences of the scattering intensity on the wavelength of light and the radius of the drop are realized.
   Research implications. Within the accepted conditions of interaction of light with a (transparent) drop of water, the models considered (the ray optics approximation and the Rayleigh scattering approximation) revealed the dependence of scattered light on the size and shape of droplets, and also confirmed the characteristic dependences of the scattering intensity on the wavelength of light and the radius of the drop.