bluuebunny/crossref_metadata_2025_split huggingface dataset:
Interconnected operation of the ozone generator with the power supply unit
Authors: Ibragimov M , Tadjibekova I E , Matchonov O 
Published: December 2021

Abstract
This article is addressed to the inductivity of the feeder transformer influence on of the plate-type ozone generator operating modes. The equation characterises the ozone generator interconnected operation with the transformer, in discharge and non-discharge modes is represented. Use of the near-resonant mode of operation is proposed with a view to reach maximum output capacity. With that end in view, it is proposed to use the transformer with higher inductance. Oscillograph charts of two modes of operation of the ozone generator are analysed. Current waveform factors are determined by the harmonic analysis method. Experiments proved that current waveform factor increase in value for the account of continuous discharge is conductive to increase of ozone output by 25-30 % and power loss reduction by 10-15 %.
Selection of a heating system based on climatic conditions of Uzbekistan and on calculations of the technical and economic indicators of alternative systems: A case study of the solar greenhouse with a transformable building
Authors: Rasakhodzhaev B , Makhmudov S , Muminov F 
Published: December 2021

Abstract
This paper presents studies on the choice of a heating system based on calculations of economic efficiency and payback periods for alternative systems, a solar greenhouse with a transformable body. The purpose of the work is to carry out calculations to determine the consumption of fuel resources necessary to ensure the required amount of energy for the heating season: consumption of natural gas, solid fuel (coal) and electricity for heating a greenhouse with a transformable (adjustable) body. Analytical methods were used to determine the cost of materials and the main units of a greenhouse with a transformable (adjustable) body. Depending on the shape of the greenhouse, the total costs, economic efficiency and payback periods are determined. The research work carried out shows that, in terms of the cost of construction and consumption of materials, the developed greenhouse with transformable (adjustable) body are quite acceptable for its successful use among farmers and private households in the Republic of Uzbekistan. Calculation of economic efficiency and payback periods for greenhouses with a transformable housing allows you to choose the most acceptable heating system and technical characteristics of alternative systems acceptable for the climatic conditions of Uzbekistan.
Effects of electric pulse processing in increasing the efficiency of cotton oil from technical seeds
Authors: Ibragimov M , Turdiboyev A , Akbarov D 
Published: December 2021

Abstract
This article provides an analysis of the global demand for cottonseed oil consumption, the growing trend of cottonseed oil production and methods of obtaining vegetable oil based on modern technologies. Based on the results of the analysis, the electro technology of electric pulse processing of seed pulp was proposed to increase the efficiency of obtaining cottonseed oil from technical seeds. Experiments have shown that the maximum degree of damage to the seed nucleus by electric pulse treatment depends on the amount of oil extraction. It is also possible to reduce the roasting temperature of electrically pulsed seed pulp to 70-75 °C, and these parameters are considered be energy-saving parameters. It is possible to increase the amount of oil extracted from the seed and reduce energy costs in the technology through electro-pulse processing.
Study on the biparametrical transudations circuits with distributed parameters
Authors: Amirov S F , Kh Sulliev A , Sanbetova A T , Kurbonov I 
Published: December 2021

Abstract
This paper highlights the methods of resenting mode in the transudation with distributed parameters. The transient parameters of the power supply were analyzed. It was discovered that resonance is provided in a small range of movement of the moving component of the sensor in known turbofan engines, indicating that the known techniques of sustaining the resonance mode are flawed. Further study should focus on developing novel methods for preserving resonance mode over the entire range of change of the converted value, general principles of turbojet engine construction, and a complete examination of their resonant circuits, according to the findings.
Study on the Electromagnetic current sensor for traction electro supply devices control systems
Authors: Amirov S , Rustamov D , Yuldashev N , Mamadaliev U , Kurbanova M 
Published: December 2021

Abstract
This article is devoted to the new electromagnetic sensor design of large direct and alternating currents with expanded functionality for the electro supply devices control and management systems on electrified railways. It’s analyzed that its nonlinear magnetic circuit with longitudinal magnetization based on the magnetization curve approximation. Also it’s shown that developed sensor sensitivity depends on working air gap sizes and modulating magnetic field induction.
Determination of the technical condition of electrical equipment in power supply systems
Authors: Rakhmatov A , Rajabov N , Yakubova Kh 
Published: December 2021

Abstract
This article describes the methods and means for determining the technical condition of electrical equipment in power supply systems, particularly in transformer substations. There are many ways to determine the technical condition of electrical equipment. However, their implementation requires complex and additional equipment and devices. In addition, these tests must be carried out when the power supply system is off. This will lead to a decrease in the quality of electrical energy. Determination of the technical condition of electrical equipment using thermal imagers is performed under the voltage and in operating modes, the measurement process does not affect the parameters of the power supply system. The results of research in energy enterprises of the Syrdarya region are presented.
Adjustments to the indicators of the heating and cooling degree-days for regions of the Republic of Uzbekistan
Authors: Avezova N R , Yu Rakhimov E , Dalmuradova N N , Shermatova M B 
Published: December 2021

Abstract
This paper identifies the indicators of the calculated heating and cooling degree-days for the territory of Uzbekistan. The revealed values of the maximum and average daily outside air temperature were taken into account based on the collection, processing and analysis of the latest archives of climatic data. These data was obtained from open sources of weather stations, suitable for servicing scientific data, in order to enter adjustments to forecasts in the design of heat and cold supply systems in buildings and structures, which, in turn, mitigate the effects of climate change.
Existing problems of drying cocoon and making chrysalis feeble, and their solutions
Authors: Khaliknazarov U , Akbarov D , Tursunov A , Gafforov S , Abdunabiev D 
Published: December 2021

Abstract
The report of introduced techniques and theoretical, analytical and experimental studies of foreign and our national scientists in recent years are given in this article. it has been established that treatment with a high frequency electromagnetic field achieves a high efficiency in drying the cocoon and killing pupae. The shell of the cocoon does not heat up with this method. This is explained by the fact that the high frequency energy is absorbed mainly in the pupa because of the difference of the dielectric constant, which leads to the heating of the pupa to 90-95 ° C and they die within 30 seconds depending on the power.
Study on the improvement the quality of drinking water via electrochemical pulse treatment
Authors: Turdiboyev A , Akbarov D , Mussabekov A , Toshev T , Niyozov J 
Published: December 2021

Abstract
This article provides information on the ongoing research on the provision of clean and high-quality drinking water, comprehensive development and modernization of drinking water supply and sewerage systems, quality characteristics, physical and chemical composition, and water treatment methods. Initial electrochemical pulse treatment for drinking water is proposed. When water is treated with an electrochemical pulse, the substances become dispersed particles and, due to improved oxidation, reduce the amount of dry matter in the water by 28%, and the oxidation rate increase by 33%, and the hydrogen peroxide ratio by 30%.
Studying safety and risk management in the gas transmission system using GIS technology
Authors: Khodjaeva S , Musaev M , Akhmedov Sh 
Published: December 2021

Abstract
In this current research, the combination of gas transportation system in line with analytical process was applied to conduct an assessment on the risk management of gas transferring pipe lines. By this process, classification and qualification of the numerous types of transportation risks would be accessible. Index and transportation index indicate risk probability and risk severity, respectively. In this regard, total risk is calculated based on the multiplication of all risk probability using geographical information systems (GIS) classified risks that have been throughout the pipeline route using attributive information. This information also gave database alternative monitoring of gas transportation.
Results of experimental tests of building samples
Authors: Yu Narkevich M , Logunova O S , Kalandarov P I , Gazieva R T , Aralov G M , Tokmazov G V , Yu Romanov P , Khushiev S 
Published: December 2021

Abstract
The purpose of the experimental study presented in the work is to generate new knowledge about the quality of concrete samples in a new information field that consolidates information about the results of full-scale tests and video streams that were obtained during active laboratory experiments-studies. When conducting experimental studies, the traditional technology of testing concrete samples for central compression was used. This was accompanied by continuous monitoring and the formation of a video stream for each sample. A distinctive feature of the study is the formation of an information field of experiments, which contains three levels: the level of initial data, the level of analysis of initial data and the level of generation of new knowledge. The level of analysis of the source data using the video stream allows you to obtain information at the end of the experiment that cannot be recorded in real time. For the samples under study, time intervals with different rates of defect development were obtained. The results obtained made it possible to identify new possibilities for the formation of the information field during traditional experimental studies of the quality of concrete images and, based on the information obtained, to identify patterns of development of surface continuity disorders in dynamics. New opportunities for the formation of the information field allow in real time to obtain and process information on the state of concrete and reinforced concrete structures of construction projects by quality indicators and, on the basis of the data obtained, predicting the risk of accidents, including at hazardous production facilities.
NPSCA-containing fertilizers based on ammonium nitrate melt and powder Suprefos-NS
Authors: Hoshimov A A , Seytnazarov A R , Tadjiev S M , Alimov U K , Tojiev R R , Madenov B D 
Published: December 2021

Abstract
Methods for improving the composition and properties of ammonium nitrate (AN) using various inorganic additives are considered. It has been shown that the employing Suprefos-NS, a product of JSC “Ammofos-Maxam”, as an additive in the AN melt allows obtaining a stabilized fertilizer containing, except nitrogen and phosphorus, macroelements such as calcium and sulfur, exclusively in assimilable forms. In this case, the mass ratio AN: Suprefos-NS varied in the range from 100: 5 to 100: 35. It was found that any amount of Suprefos-NS additives significantly improves the composition and properties of the AN.
Planting dates and seedling age of red cabbage during the spring season in Uzbekistan
Authors: Adilov M M , Rustamov B A , Amanova M E , Rustamov A S 
Published: December 2021

Abstract
The importance of red cabbage for expanding the range of vegetable crops in Uzbekistan is highlighted in this paper. The results of three-year (2018-2020) studies on the comparative assessment of the effectiveness of three spring planting dates (March 5-9, 13-16 and 25-27) at three seedling ages (70, 60 and 50 days) at each planting date were presented. It was revealed that the later the seeds are sown to obtain seedlings for spring culture, the faster the seedlings appear and the more the seedlings form leaves. With the postponement of the timing of planting seedlings, the survival rate of seedlings increases. It has been established that the later the seedlings are planted, the higher the temperatures are the growth of plants and the formation of heads. The most unfavorable temperature conditions are formed when the seedlings are planted on March 25-27, which causes a delay at the beginning of the formation of heads of cabbage, an increase in the number of leaves of a root rosette, a decrease in the setting and average weight of heads of cabbage and their marketability. The best indicators of head set-up, their average weight and marketability, yield per unit area are provided when planting on March 14-16, 70 and 60-day old seedlings. Planting seedlings on March 25-27, seedlings of any age, due to the formation of heads of cabbage at excessively high temperatures, delays the flow of products, reduces the setting, average weight and marketability of heads of cabbage and significantly reduces the yield per unit area. It is recommended for a spring culture to plant on March 14-16 with 70 and 60-day old seedlings and not allow planting at the end of March.
Planting dates and placement of the Sophora plantation on the irrigated lands of the Tashkent oasis
Authors: Kalandarov M M , Mashrapov KH T , Salokhiddinov G M 
Published: December 2021

Abstract
This article is very relevant to set out organizing plantations in the conditions of the Tashkent oasis. Climatic zones of desert and semi-desert under the influence of new conditions (abundance of light and thermal solar energy, a very long growing season, artificial irrigation), the growth and development of sophora is favorable. Annual seedlings under the influence of mineral fertilizers reach a height of up to 110 cm, the growth of lateral shoots of seedlings in the first year after planting is 33 cm.In the conditions of the Tashkent oasis, sophora favorably tolerates short-term winter low air temperatures (up to 30°C), tolerates soil compaction and has established itself gas-, dust-resistant decorative breed. The number of inflorescences on one tree ranges from 16 to 60 pieces, depending on the layout of the seats. Abundant flowering of sophora was noted with a planting pattern of 5.0x4.0, 5.0x3.0 with sufficient sunlight. The content of rutin in fruit elements ranges from 3.9 to 14.7% and depends on agrotechnical care, the state of the plantings themselves and their location.
Investigating the cultural-morphological features of rhizobacteria and allocating it from the cotton plant (Gossýpium hirsútum): in the example of irrigated meadow soils of Uzbekistan
Authors: Khojanazarova M K , Murodova S S , Sanakulov S F , Khalmuminova G K 
Published: December 2021

Abstract
This paper investigates the cultural-morphological, physiological and biochemical properties of bacterial isolates with stimulating properties isolated from the rhizosphere of cotton (Gossýpium hirsútum) grown in saline soils of Uzbekistan. The cells of the isolated culture No. 12 were found to be rod-shaped, 2-3x0.5-0.6 urn in size, single or chain-linked, Gram-positive aerobic bacteria producing spores. In studying the culture No. 146, its cells were in the form of thick, less mobile rods, 1-2x0.6-0.8 urn in size, forming thermostable spores. The spores were located in the center of the cell; the Gram-stained colonies in meat-peptone agar were round, bulging; the edges were flat, consistency oily, smooth and, mucous; and, the upper part was found to be shiny. Studies have shown that the isolates appertained to the genus Bacillus sr.
Influence of biopreparation ‘Zamin-M’ on cotton plants (gossypium hirsutum) under soil salinization in Uzbekistan
Authors: Khojanazarova M K , Murodova S S , Sanakulov S F , Turdaliev J M 
Published: December 2021

Abstract
In this article, a microbial inoculant acting as a biofertilizer is considered as a biostimulant, consisting of three strains of local salt-tolerant strains of rhizobacteria Pseudomonas stutzeri SKB308, Bacillus subtilis SKB309, Bacillus megaterium SKB310. The authors have developed and introduced into agricultural practice an experimental sample of the biological product ‘Zamin-M’, which increases the resistance of cotton to stress conditions of soil salinity. It is proved that the biological product ‘Zamin-M’ increases soil fertility has a beneficial effect on the enzymatic activity of the soil and the development of a population of beneficial microorganisms. The bioproduct ‘Zamin-M’ is presented as a new stimulant in the practice of growing cotton in saline conditions. An agricultural technique for the use of a local biological product in agriculture has been developed. The ‘Zamin-M’ is included by the State Committee of the Republic of Uzbekistan in the list of agrochemicals and pesticides permitted for use in agriculture of the Republic of Uzbekistan (certificate No. 1A1005).
Influence of physicochemical factors on water exchange in cotton leaves under the moisture deficit conditions
Authors: Usmanov R M , Nabiev S M , Lukyanova S V , Sagdiev M T , Hamdullaev Sh A 
Published: December 2021

Abstract
Presowing treatment of cotton seeds with a physical factor (low-frequency electromagnetic field - LF EMF) and a chemical compound (glycyrrhizic acid - GzA) and sowing them under conditions of optimal and limited water supply showed that different varieties of cotton, depending on their biological peculiarities and the method of seed treatment, had different parameters of water exchange in plants. The experiments were carried out in laboratory, greenhouse, lysimetric and field conditions, the indicators of the electrical resistance of leaf tissues (ERLT) of cotton plants depended on the conditions of water supply. According to this indicator, the varieties Ishonch, Gulbahor-2 and Navbahor-2 showed greater resistance to soil moisture deficiency, in comparison with the variety Tashkent-6. The plant varieties from seeds, treated with LF EMF and GzA, to a greater or lesser extent, are in the range with the lowest ERLT values, in comparison with the varieties from untreated seeds.
Determination of Temperature of Components of Cotton-Raw Material in a Drum Dryer with a Constant
Authors: Mamatov A Z , Usmankulov A K , Abbazov I Z , Norboyev U A , Mukhametshina E T 
Published: December 2021

Abstract
This article solves one parabolic-type boundary value problem for determining the heat-moisture state of raw cotton in drum dryers at a constant air temperature. Numerical results are obtained by the Bubnov – Galerkin method of the problem under consideration, a comparative analysis is carried out with experimental data. It is shown that the proposed mathematical model and its numerical algorithm adequately describe the drying process of raw cotton.
Construction of mathematical modelling of a population of microalgae
Authors: Rakhmanov Sh , Abdullaeva D , Azizova N , Nigmatov A 
Published: December 2021

Abstract
This article devoted to the development of the mathematic model of the technological process of the chlorella cultivation process, its features and solving of this mathematic model. The Exponential growth of microalgae population under conditions of unlimited nutrient resources and population space proceeds at a rate proportional to the number of species of predominant cells and is described by the differential equation. In the presence of several inhibitors, specific velocity equations with the number of inhibitors can be used, but, as a rule, there are practically no elements acting as inhibitors in the cultivation of Chlorella microalgae. The modeling of this particular class of objects did not take into account the effect of inhibitors on the growth of microalgae. The consumption of nutrients to support the life of microalgae is described by the differential equation. In the course of this work, the processes of cultivation of microalgae were brought together into a system of equations. As a result, a system of differential equations of the technological process of Chlorella cultivation was obtained. Thus, the obtained system of equations describes the process of cultivation of microalgae and its technological process, implemented in a periodic mode.
Study on some features of water exchange of local varieties of hard wheat
Authors: Khodzhaeva N D , Urazbayev I U , Ishankulova K K 
Published: December 2021

Abstract
This article discusses the main physiological indicators of water exchange in winter wheat varieties Makus-3, Istiklal and Istiklal-20. There were revealed indicators of daily and residual water deficit of leaves, as well as the water potential of leaves.As you are aware, drought resistance of plants depends on a number of factors. In particular, it is largely determined by the biological characteristics of plants.In this regard, the identification of the features of the physiological processes of the water regime and the associated metabolic processes that determine the resistance to drought in various varieties and hybrids of wheat is of great interest not only in scientific but also in practical terms, because the research results can be used to develop recommendations for selection of source forms for breeding work. We have studied a number of indicators of the water regime of local varieties of winter wheat -Istiklal, Istiklal-20 and Makus-3. The research was carried out on plants grown under the conditions of vegetation and field experiments in the phases of booting, earing, flowering and waxy ripeness.
Characterization of expansive soils for the foundation of an irrigation canal in the Peruvian Andes, Cabana-Mañazo case
Authors: Pilares-Hualpa I A , Alfaro-Alejo R , Pilares-Calla C A , Alfaro-Vilca O E 
Published: December 2021

Abstract
Alterations in water content in swelling soils cause volume variation, which implies constructive, socioeconomic and environmental damage. This paper characterizes the swelling soil located in an irrigation canal of the Peruvian Altiplano and its behavior of the properties by addition of lime in 5, 10, 15 and 20% of the total weight. Finding that the sample of the station 6+575 has combined presence of montmorillonite clays in a percentage of 13.52% together with the group of kaolinites in a percentage of 1.31%, consequently, it makes expandable clay of high plasticity. The soils of the station 6+250 have the characteristics of kaolinite clay, which distinguishes it as having low plasticity. In the swelling tests the high expansiveness was found, in the station 6+575, which has decreased with the addition of lime. Considering that concrete canals are generally of small thickness it would be important to consider the slightly dangerous effects on irrigation infrastructure.