Optimization of the power consumption mode of pumping stations of “Suv Okova” by reactive power

The optimal modes of the existing compensating devices under operating conditions were determined. Minimum power and energy losses were taken as optimality criteria. The unconstrained optimization problem was considered, i.e., finding the absolute minimum. When solving the problem to find the optimal mode of operation of the “SUV OKOVA” network, a relative minimum was found since the system of constraints has a nonlinear form. The problem of conditional optimization in terms of reactive power is solved, for which the gradient method of quadratic programming is used

TA'LIM-TARBIYA SIFATINI OSHIRISHDA SHAXS KOMPETENTSIYALARIGA ZAMONAVIY YONDASHUVLAR

<p><i>Maqolada ta'lim tizimidagi pedagogik o'zgarishlar, ta'lim sifatiga qo'yilgan talablar, ta'lim va tarbiyaning uzluksizligini ta'minlovchi omillar va ularning hozirgi kundagi ta'sir yo'nalishlari keltirilgan. Bundan tashqari ta'lim sifatini oshirishga xizmat qiluvchi o'qituvchi shaxsining rivojlanish kompetentsiyalari, ularga qo'yilgan talablar hamda zamonaviy yondashuvlar keltirilgan.</i></p&gt

A theoretical method of the reception of blue stem feed by the feeders and transfer to the grinding drum

Uzbekistan pays a lot of attention to fisheries, poultry and animal husbandry. In fish farming, poultry and livestock rearing, it has been recommended to give green feed as a supplementary feed, which reduces the accumulation of excess fat in fish. In this regard, a grinder was produced for cutting plants with blue content. The number of rotations of the feeders was studied theoretically and experimentally in order to meet the demand of the prepared feeds. According to the theoretical research, the cutting length of blue stalk feed is achieved by changing the number of revolutions of the shredder drum depending on the feed speed Vuz and the number of blades in the drum N p , and the number of revolutions of the feeder blades when the feed is transferred at an angle of 27O is 101-207 r/ in the range of min, when the number of blades is in the range of 4-6 pieces, it is recommended that the number of rotations of the shredder drum be greater than 1358 r/min and 1478 r/min to ensure a cutting length of up to 10 mm

Optimization of the power consumption mode of pumping stations of “Suv Okova” by reactive power

The optimal modes of the existing compensating devices under operating conditions were determined. Minimum power and energy losses were taken as optimality criteria. The unconstrained optimization problem was considered, i.e., finding the absolute minimum. When solving the problem to find the optimal mode of operation of the “SUV OKOVA” network, a relative minimum was found since the system of constraints has a nonlinear form. The problem of conditional optimization in terms of reactive power is solved, for which the gradient method of quadratic programming is used

Study of the strength properties of modified concrete in tension

The resistance of concrete to axial tension is much less than the resistance to compression and is largely determined by the adhesion of its components. The low tensile strength of ordinary concrete is explained by the heterogeneity of its structure and the discontinuity of concrete, which contributes to the development of stress concentration, especially under the action of tensile forces. To increase the tensile strength of concrete, it is necessary to eliminate, first of all, the heterogeneity of the structure of concrete - one of the main reasons for the large dispersion of the results of mechanical tests of this material, which affects the experimental determination of compressive strength. A significant difference between the compressive strength for ordinary concrete indicates a rather large spread of such values. This scatter is explained by the different influence of factors on tension and compression. For example, for ordinary concretes, it was found that with an increase in W/C , the tensile strength decreases, but to a lesser extent than the compressive strength. With an increase in the grade of concrete, the tensile strength increases. High-strength concretes, as a rule, prepared on concrete mixes with low W/C and on clean conditioned aggregates in the form of crushed stone and sand, have an increased density, therefore, they have less variation in strength readings both in compression and at stretching [1-4]

Change in the strength properties of modified concrete over time

To date, there is no data on the change in the strength of hyper - compacted concrete. The conducted field observations summarize the data of a long-term period and allow us to draw a number of conclusions. As shown by numerous studies, the nature of the development of the strength of concrete over time depends mainly on the type of cement, the composition of the concrete mixture, the temperature and humidity conditions of hardening, and also on many other factors. Obtaining highly efficient building materials is possible by modifying the structure of cement stone and concrete. Consequently, the modification of the concrete structure in this direction is intended to improve the technological properties of the material. By modifying it is possible to change the kinetics of the growth of physical properties and the final values of the strength of concrete. Without considering the physico-analytical mechanism for changing the structure formation of concrete, we note that it is primarily aimed at reducing the amount of water - a mixing agent per unit volume of the material. However, various studies have shown that in the initial period, the structure formation of cement stone develops in the optimal direction only at certain volumetric water content. The limiting reduction in water content complicates the process of hydration of the binder, limiting the final strength properties of the material. At the same time, the final strength properties of the material are improved by reducing the volumetric water content of the mixture in every possible way. In all cases, the modification of concrete assumes its composition to be unchanged from the mixing of the mixture to the final stage of the formation of the concrete structure