In this paper, there was an executed investigation of the behavior of orthotropic decks with the system of cross and side stiffeners forming structural orthotropy. In order to conduct an analysis of the stress-strain behavior of such structures, the Bubnov-Galerkin variation method has been used. Comparative analysis of results, received in two ways has been conducted: calculation according to actual values of stiffness properties, calculation according to relative bending stiffness. It was shown, that calculation in such two ways gives sufficiently close results to each other. The suggested calculation method can be applied while “primary “non-mechanic” calculation methods of structurally orthotropic decks with different sizes in the plan and other boundary conditions.

Railway transport is one of the basic modes of transport and the economy as a whole for the Republic of Kazakhstan. It is this type of transport that ensures the transportation of a significant amount of dangerous goods of various properties. Failure to observe safety measures and precautions during their transportation may pose a threat to railway workers, the public, as well as to the environment. Transport safety is the highest priority of various parts of the railway transport. Safety depends on the synergistic interaction of many components of the transport process – the properties of the cargo, the technical condition of the rolling stock, the track and infrastructure of the railways, the qualifications of workers, the state of the environment, and the like. This article discusses the ecological problems in railway transport, their negative impact on the environment.

The article presents the results of research on obtaining a modified metal coating on the surface of dielectric materials. The study of the production of metal coatings using a chemical method on dielectric materials is one of the most important areas of research. Currently, there are a lot of plastic parts in cars, both inside and outside. To meet the aesthetic and protective requirements, these plastic parts receive metal coatings. Metallization of dielectric materials is used to change the characteristics of the processed samples. After the metal layer is deposited on the sample, the sample acquires additional resistance, namely to high temperatures, corrosion, wear and erosion. In addition, the deposited metal layer protects the finished product from the environment and serves as a decorative decoration. Metallization allows you to give non-metallic samples a certain property.

The article is devoted to the actual problem of creating damping steels with a nanostructured coating. The object of research is the steels used for the manufacture of gears, rims, half-couplings, gears and generating noise that creates acoustic discomfort. The main idea of ​​the work is to assess the acoustic, vibration, physical-mechanical and damping properties of steels, to obtain steels with a nanostructured coating with increased damping properties, which reduce noise and vibration. During the work, the acoustic (sound level, sound pressure level) characteristics of the alloys were investigated. Based on the results of the work carried out, new damping metal materials based on iron have been developed.

The paper analyzes ways to improve the quality index of the process of obtaining structural beryllium blanks by vacuum hot pressing of beryllium powders with a fineness of less than 56 microns. In the course of the work, the following were carried out: a comparative analysis of the quality of hot-pressed blanks depending on the production period; analysis of the representativeness of the values ​​of the characteristics of powders; studied the dynamics of changes in the chemical composition of beryllium in the process of grinding ingots. The results of studies of the reasons for the instability of the quality of sintered beryllium billets are presented. Using the method of mathematical statistics, the influence of individual factors of industrial production on quality indicators was studied. The results of changes in the chemical composition of beryllium during the grinding of ingots are presented, as well as an assessment of the irreproducibility of the results of analysis of the content of impurities and certification of products by mechanical properties.

The complexation of metal ions with polymer hydrogels has been studied. For the study, polyelectrolyte hydrogels based on hydroxyethyl acrylate, acrylic acid, and chitosan were synthesized, on the surface of which ions of various metals were chemisorbed with the formation of chelate complexes. The formation of complex compounds of the polymer hydrogel with ions of divalent and trivalent metals was confirmed by the data of IR spectra. The dynamics of swelling of a polyelectrolyte hydrogel based on a copolymer of acrylic acid and acrylamide has been studied. It was found that the swelling coefficient of the formed complexes depends on the nature of the transition metals: ion radius, electronegativity. New polymer-silicate composite materials have been obtained by intercalation polymerization of synthetic monomers. As a silicate component, we used the clay of the Darbazinsky deposit, previously activated with a 5% sodium carbonate solution. The composites were synthesized in the presence of a crosslinking agent at a temperature of 333.15 K for 1 hour. The formation of the target products is confirmed by the data of IR spectra and the kinetics of swelling.

Due to the change in the composition of the processed raw materials at the Balkhash Copper Plant (BCP), it is required to adjust the technology used to melt copper sulfide concentrates in the Vanyukov furnace (VF). It is promising to use additional carbon-containing fuel that burns in the bubbling zone increasing the melting temperature and partially reducing slag oxides to ensure the required autogenousity and melting temperature. However, part of the solid fuel does not burn in the bubbling zone with an oxygen-containing blast and does not participate in reduction reactions with slag oxides that result in its accumulation on the surface of the slag melt. The results of the industrial tests performed earlier in the BCP to feed coal dust through tuyeres to the VF with the purpose to maintain the required temperature of the slag melt and satisfactory separation of slag and matte were considered. The reasons for the unstable operation of the tested system to feed coal dust to the VF through tuyeres were determined, and directions for its improvement were outlined. Laboratory experiments were performed to simulate the behavior of coal dust in the quiet zone of the VF. The regularities of the distribution of coal dust were determined, and it was shown that coal dust was concentrated on the slag melt surface. Thus, coal dust that did not react with blast oxygen or oxides of the slag melt in the bubbling zone was carried to the surface of the slag melt, promoted the formation of a viscous crust, and then practically did not interact with the slag melt and becomes practically useless.

This article reflects the results of spectral analysis for use in production as a second product by creating a briquette of dust formed during the melting of ferrosilicoaluminium alloy. Briquettes made according to two samples were made with isothermal retention in the Tamman furnace and spectral analysis of the resulting products was carried out. As a result of the analysis, it was found that the dust contains the main silicon and aluminum oxides not in the form of kaolinite (Al2O3∙2SiO2∙2H2O), but separately in the form of SiO2 and Al2O3, as well as the absence of mullite (3Al2O3∙2SiO2) during heating to a temperature of 1600°C and the formation of silicon carbide SiC at once, as well as a total of 43.73% carbide. As a result, raw materials were obtained that optimize the electric model of the melting process, solving environmental and economic problems with the return to production of the left dust as briquette waste.

This article discusses modern technologies for protecting corporate networks. Using corporate network protection technologies, software developers can guarantee the security of software where it will be used. But there are attacks for which a network system engineer should have the best means of protection.

The article describes the role of the theory of differential equations in modern mathematics and its application. To describe its place in modern mathematical science, first of all, the main features of the theory of differential equations, consisting of two broad areas of mathematics: the theory of ordinary differential equations and the theory of partial differential equations, are highlighted. The first feature of this theory is its close connection with applications. It is noted that the theory of differential equations is primarily based on the formulation and understanding of quantitative and qualitative laws that make up the content of the natural sciences as an integral part of natural science. The article also emphasizes the second feature of the theory of differential equations, its connection with other areas of mathematics, such as functional analysis, algebra and probability theory. The purpose of this article is to identify modern problems in the theory of differential equations and to construct a system of corresponding problems.