Research on Methods to Increase the Strength and Flame of Reinforced Concrete Structures

This article's text examines the challenges surrounding improving methods for raising the fire resistance of reinforced concrete structures, as well as the present state of the art in the field of methods and tools for boosting concrete building fire resistance. The difficulty of selecting, creating, and implementing approaches and tools for assessing the durability of reinforced concrete structures while taking thin-layer, fire-resistant glass coatings into account. Because of the use of thin-layer flammable embossing coatings, it was determined that evaluating the heating capabilities of reinforced concrete structures during a fire was critical. The creation of a method for assessing the qualities of thin-layer coatings formed on swelling reinforced concrete structures caused by fire, as well as the refractive efficiency of thin-layer fire-resistant coatings on concrete structures. A determination of the fire-resistance efficiency of reinforced concrete structures and the ideal thickness of thin-layer fire-resistant coatings was also made based on the research findings

MATHEMATICAL PROPERTIES OF FRACTAL GEOMETRY AND ITERATIVE FUNCTION SYSTEM

This article discusses the concepts of fractal and fractal geometry, as well as the design of rule-based properties in the constructional construction of structural trusses used on top of buildings, based on the principles of fractal geometry and the analysis of the mechanical properties of these novel structures. Fractal based truss. This article presents a mathematical method for constructing geometric fractal shapes. The use of an iterative function system (IFS) has been proposed in the construction of fractal forms. We determined the fractal dimension of the constructed fractal form and showed its correlation with the mass value of the farm

International Disease Epidemics and the Shadow Economy

Adding to the emerging body of research related to the current coronavirus crisis, this paper studies the impact of disease epidemics on the worldwide prevalence of the shadow or the underground economy. The informal sector undermines compliance with government regulations and lowers tax collections. Our main hypothesis is that epidemics positively impacts the spread of the shadow economy. Using data on nearly 130 nations and nesting the empirical analysis in the broader literature on the drivers of the shadow sector, we find that both the incidence and the intensity of epidemics positively and significantly contribute to the spread of the underground sector. Numerically, a ten percent increase in the intensity of epidemics leads to an increase in the prevalence of the shadow economy by about 2.1 percent. These findings about the spillovers from epidemics have implications for economic policies in the current times of coronavirus. JEL-Codes: I150, K420

Investigation of the frequency characteristics of composite iron powders with insulating oxide coatings

This article discusses methods for studying the frequency characteristics of composite iron powders with insulating oxide coatings. The main dependences of hysteresis losses on induction for a full cycle at a frequency of magnetization reversal for various cross-sections of iron powders, sharply differing in the shape of the hysteresis curve and the values of the main magnetic characteristics, are studied, and also frequency dependences in the range of 50 Hz - 1 MHz of the figure of merit and inductance for samples based on composites are considered from powder Hoganes ASC100.29 after annealing in air, in water vapor and hydrogen at a temperature of 400 ° С for two hours. Based on the analysis of the dependencies, it can be explained by the fact that a material with a thin layer has a lower electrical resistivity, which means that the total electromagnetic losses will also be greater due to an increase in the contribution of losses to eddy currents. At the same time, the magnetic permeability at a frequency of 1 kHz differs by 30 units, and with an increase in the frequency to 1 MHz, it decreases by 10-15% for both materials. This makes it possible to use iron-based soft magnetic materials for electrical engineering

Use of Humic Organic Matter and Rhizobacteria in the Cultivation of Winter Wheat in Areas Polluted With Heavy Metals

The article presents experimental results on the reduction of the content of heavy metals in the roots, stems and grains of wheat grown on soil contaminated with heavy metals belonging to “Almalik Mining Metallurgical Combine” JSC (Joint-Stock Company) under the influence of bacterial fertilizer, potassium humate and Serhosil biopreparations created on the basis of wheat rhizobacteria. In the development phases, the resistance of the crops to the harmful effects of heavy metals was increased, the metabolism in the plant, the growth and development of the plant were accelerated, and the yield of 55 centners of grain per hectare was achieved, compared to the control option, an additional yield of 7 centners of grain per hectare was achieved

Dependence of the wetting rate of the loess base on the moisture conditions

The increasing demand for improved irrigation systems in the world requires a more comprehensive and widespread study of the reliability and safety of hydraulic structures. In this regard, increasing the reliability during the operation of hydraulic structures of irrigation systems, especially on collapsible soils, is very important because loess subsidence soils are widespread globally, a significant part of loess rocks are also found in Central Asia, including the Republic of Uzbekistan. This article discusses the study of the features of the joint work of full-scale irrigation structures with their loess subsidence bases and the intense - deformative state of subsidence foundations during their joint work with hydraulic structures on irrigation canals of the Kashkadarya region

Critical flow velocities in cohesive saline soils

The article discusses the issue of determining non-erosion velocities for cohesive saline soil at the bottom and slopes of canals. Based on the formulas of Ts.E. Mirtskhulava for the determination of non-eroding velocities of water flow in cohesive soils, equations for determining non-eroding velocities for cohesive saline soil are proposed. A brief technique for conducting laboratory experiments and modeling of saline soil is presented. Based on the obtained data of laboratory experiments, the dependences for determining the non-eroding velocities of the water flow in the channels of the cohesive saline soils are obtained

Development of a method of oriented immobilization of lipases on a solid carrier

The methods of oriented immobilization of lipases on a solid carrier - Silochrome C-80 have been developed. The resulting sorbents were tested in the process of obtaining biodiesel from cotton oil. It was shown that immobilized lipase on Silochrome C-80 with NH2 group has the highest transetrification ability and stability, while in sorbents with the enzyme immobilized with -COOH and -SH groups this value was 87 and 53%, respectively. Biocatalysis using an affinity sorbent of immobilized lipase with the –NH2 group has a high operational stability, which, after 240 hours of operation, retains more than 50%, and after 480 hours, 17% retains its initial activity

International Integration and Cooperation at the Present stage in the Fight Against Plague and Other Dangerous Infections in the Kyrgyz Republic

The paper contains the data on international cooperation of the Republican Center of Quarantine and Particularly Dangerous Infections of the Ministry of Health of the Kyrgyz Republic and the Russian Research Anti-Plague Institute “Microbe” of the Rospotrebnadzor to combat plague and other dangerous infections over the period from 2016 to 2022. Areas of cooperation include conducting joint epidemiological monitoring of plague foci in the Kyrgyz Republic; exchange of up-to-date information on the state of natural foci of the two countries; equipping the anti-plague service of the Republic with modern equipment and mobile laboratories, diagnostic tools and technologies; conducting joint exercises to ensure biological safety and prompt response to emergencies; provision of advisory and methodological assistance; training and strengthening of professional personnel; conducting joint scientific researches, conferences; publication of scientific works. Data on the complex characterization of properties and phylogeographic analysis of Yersinia pestis strains isolated during field studies in the Kyrgyz Republic in 2012–2020 are summarized. The prospects for carrying out joint cartographic, molecular-genetic and paleomicrobiological work in the natural foci of the Kyrgyz Republic are outlined