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Abstract In order to improve the energy characteristics for low-power ozone generators, it is proposed to use a continuous discharge burning mode. It is due to a significant phase shift between the currents and voltages on the ozone generator. Conditions for conducting the continuous discharge mode were identified.

This article deals with the worked out specialized railway carriage for grain for the transportation process throughout the Republic of Uzbekistan railway network, with the unconditional provision of train traffic safety, which is one of the most important components of the rolling stock of railway transport. The features of the load-bearing structure of the railway carriage for grain are that it is made based on a four-axle platform and a universal container. Evaluation of the strength of the metal structure of the grain car was carried out following the requirements of the “Standards for the calculation and design of new and modernized cars of the railways of the Ministry of Railways with a gauge of 1520 mm (non-self-propelled)”. Based on theoretical studies, it was justified that the design of a railway carriage for grain with a capacity of 83.6 m3 and a carrying capacity of 65 tons. For the first test of a railway carriage for grain, the number 43925684 was assigned. The proposed new grain carriage will reduce operating costs and reduce rolling stock downtime during reloading operations. It will create the possibility of fulfilling contractual agreements drawn up for small volumes of traffic within the country.

This article discusses the loss of bioindicator characteristics in oribatid mites found in the Kashkadarya region due to various anthropogenic and environmental factors. The study, conducted during the spring and summer of 2023, focused on pine and spruce gardens surrounding the Shortan gas-chemical industrial area. The results of our research identified 23 species, including Ornithonyssus bursa, Geratoppia quadridentate, Furcoribula furcillata, Perlohmannia altaica, Liochthonius kirghisicus, Asiacarius elongatus, Liochthonius hystricinus, Cultroribula dentata, Epilohmannia cylindrica and Michelia paradoxa with bioindicator properties. Changes in these indicators of species primarily occurred in the A soil layer, up to 10 cm deep. The study found that the primary factor influencing these changes was not the chemical waste from the industrial plant but rather acid gases resulting from burning companion gases, leading to acid rain formation when mixed with precipitation.

Abstract Methods of calculating the shell structures from composite materials and studying the concentration of strains near the holes are devoted to a rather large number of works. However, most of the research was carried out within the framework of the classical Kirchhoff-Love hypothesis, which does not take into account the interlayer and lateral shifts characteristic of composite materials. Application of finite elements method to solve the problems on orthotropic shells of composites, weakened by several holes is reported within the improved theory of Timoshenko type. A numerical algorithm has been developed using the finite element method and a software package has been implemented on a computer that makes it possible to solve problems of stress concentration near two apertures in shells of composite materials. Shearing parameter has been studied for its influence on stress concentration near two circular holes internal pressure for orthotropic spherical shells. Specific results are presented for the cases of large and small holes, taking into account the rigidity of the reinforcing elements. Thus, this software package can be applied to the calculation of the elements of shell structures from orthotropic composite materials weakened by several holes.

In the past, remote sensing was limited to the use of the visible part of the electromagnetic spectrum, the part of the spectrum that is invisible to the human eye can now be used with the help of spectral filters, photo films and other types of sensors. Also, the view of the earth was applied to practice and to solve life problems, for example, we can cite air reconnaissance during World War II. Aerial photographs provided the opportunity to observe the location of the enemy's army quickly and more safely than observation from the ground. Aerial photographs allowed military maps and information about strategic locations to be updated quickly and with relative accuracy. Remote sensing is carried out from the air by airplanes and with the help of satellites. Digital cameras, scanners, video images, radar and thermal sensors are also used in remote sensing. Remote sensing is a field that requires fast, accurate and new data collection and is widely used in environmental management. This article presents the stages of creating topographical bases for maintaining state cadastres in the Tashkent region, taking space photos, taking aerial photos, performing geospatial linking, vectoring, and creating electronic digital maps. At the same time, scientific research such as filling the attributes of electronic digital cards and comparative analysis of space photo download sources has been reflected.

In the presented research work, heat pipes of gravitational and ring type were investigated. Two types of heat pipes were fabricated and tested under natural conditions for the study. According to the results of experiments, depending on the materials and dimensions of the heat pipes under study, the average value of the temperature difference in the gravitational heat pipe is 1.7 times higher, and the thermal resistance is 1.3 times lower.

Recent studies show that hybrid powertrains with dual clutch transmission are becoming more common. This is mainly influenced by the fact that they have higher efficiency, allow power-on shifting, and are more compact. However, the electric motor attached to the primary shaft of the transmission might represent some critical issues in statics and dynamics due to additional torque, inertia, and working irregularities. This paper aims to investigate the influence of the electric motor integration in the transmission on the reliability of the overall system. The focus is on the investigation of potential over stresses of the ICE bearings due to the bending of the gearbox primary shaft. To achieve the aim, the static and the rotor dynamic analysis of the inner and outer primary shafts is performed. The numerical analyses show the potential critical issues that can arise from the excessive manufacturing and assembling tolerances, the interaction of the e-machine torque irregularities and inertia with the bending dynamics of the primary shafts.

In the article, the medicinal properties, botanical description of the promising medicinal plant Hypericum perforatum species are studied, and the morpho-biological characteristics of the Hypericum perforatum species in the gray soils of Samarkand region are based on the comparative aspect. Depending on the planting conditions and periods of Hypericum perforatum, the seed yield, phytomass yield was determined, and recommendations for the cultivation of quality seeds and raw materials were developed.