Search

This article is devoted to the study of the role of system properties of convective clouds in the formation of their macro- and microstructural characteristics. It is noted that research in this direction is one of the ways to develop cloud physics at the next stage. The results of numerical experiments on investigating the influence of the ambient atmosphere on the formation of macro- and microstructural characteristics of convective clouds are presented. It is the influence of the atmosphere that is one of the main structure-forming factors for clouds. The structure of the wind field in the atmosphere is considered the mechanism of the influence of the ambient atmosphere on cloud formation processes. The research is conducted on the basis of a 3D nonstationary model of thunderstorm clouds. [ABSTRACT FROM AUTHOR]

The two-dimensional nonstationary model of convective clouds is developed. Based on numerical experiments with the developed model, the structure of a cloud at different time moments is investigated. The cloud evolution in natural conditions is computed. The cloud seeding using the functions of artificial crystal sources that imitate the seeding is simulated. An effective seeding mechanism is considered using the model. [ABSTRACT FROM AUTHOR]

A three-dimensional mathematical model of the diffusion of impurities from a short-term source taking into account meteorological conditions is presented. The model includes the system of equations of hydrothermodynamics describing regional atmospheric processes. The transfer of multicomponent gas impurities is calculated taking into account microphysical processes, precipitation, and fog. Initial information for model initialization is aerological information in the form of actual or forecast fields of meteorological parameters and characteristics of sources of impurities. A numerical analysis of the diffusion of impurities in the near zone of a cosmodrome from short-term sources such as engines of launch vehicles was performed for various meteorological parameters, including wind in the atmosphere. [ABSTRACT FROM AUTHOR]

This paper presents a modification of biodegradable polymers with highly-disperse metals, for example Fe/ FeO or Fe2O3 (Z), with nano-sized particles. During the course of the work, biodegradable polyethylene composites with the composition PE-276 + Z + starch (Z = 0.1% by wt, starch from 2.5 to 10% by wt) were produced. Studies were made of the rheological and deformation/strength characteristics of the composites produced. A regular relationship was identified between the rate and extent of biodegradation and the percentage starch content in the composites. [ABSTRACT FROM AUTHOR]