bluuebunny/crossref_metadata_2025_split huggingface dataset:
Aeromechanical purification of freshly harvested seed heaps of desert fodder plants
Authors: Farmonov E , Lakaev Sh , Khalilov R , Gorlova I 
Published: July 2020

Abstract
It is stated in the paper that the difficulty in cleaning freshly harvested seed heaps of desert fodder plants and in the creation of cultivation equipment for their sowing is due to specific features of the physical-mechanical properties of seed heaps of desert fodder plants. The high content of weeds (up to 70%) in the composition of freshly harvested seed heaps collected manually or by mechanized methods makes them loose, leading to the impossibility to sow these seeds without preliminary cleaning. A proposed technological process of aeromechanical cleaning of freshly harvested seed heaps of desert fodder plants is as follows. First of all, it is necessary to provide for the enrichment of the heaps by separating the coarse-sized fractions. The enriched heaps of seeds are subjected to stage-by-stage separation. At the first stage, coarse impurities are singled out by a mechanical working body, and at the second stage - separation of seeds and small impurities is conducted by an airflow. A technological process of aeromechanical separation of freshly harvested seed heaps of desert fodder plants was investigated, as a result, the final velocities of particle motion along the working surfaces which have the form of a straight line, a parabola, and a semicircle were determined. The most acceptable form of the working body was identified — a circular semi-ring installed in an aeromechanical separator. The effectiveness of seed cleaning by an aeromechanical separator was determined.
Justification, development of new technology and design for drying seeds of desert fodder plants
Authors: Karimov K , Akhmedov A , Kushimov B , Yuldoshev B 
Published: July 2020

Abstract
Proposals for the development of highly efficient new resource and energy-saving technologies and designs for seed drying are substantiated in the paper-based on theoretical research and scientific results. The developed new improved design of a vacuum drying unit with a heat transfer fluid and a heat accumulator for drying seeds of desert fodder plants, a diagram of the energy storage process, an irradiation scheme using heat waves of a flat layer are substantiated and presented.
The positive effect of external physical fields on drying processes is substantiated and determined by mathematical simulation and experimental methods. Design basics of drying equipment of desert fodder plant seeds are developed in analytical solutions based on numerical values of key parameters. Extensive information is provided on the previously obtained results of an analytical study and computer implementation of the developed advanced mathematical models; the solution to the problem of seed drying in an analytical form for non-stationary and stationary problems of the known system of A.V. Lykov differential equations are given.
Modeling fetus melon as an object of technical processing
Authors: Shaymardanov B , Borotov A , Jumatov Y 
Published: July 2020

Abstract
The Republic of Uzbekistan is one of the leading regions for the production of gourds - especially the most valuable varieties of melons. The nutritional value is primarily due to the high sugar content, and the taste value is due to the sucrose content. Summer grades with a sugar content of 12 … 19% are considered the most sugary. The sucrose content is 60 … 80%, but these varieties for long-distance transportation are practically unsuitable, so they are used in growing areas. It has been established that in non-waste processing from 1 ton of melon fruit it is possible to obtain: melon jam - 155…165 kg or concentrated melon juice (“honey”) – 65 … 70 kg or dried (dried) melon – 70…75 kg; vegetable oil from seeds – 2.5…3 kg; protein flour from the peel – 20…23 kg. The article presents the results of a study of the physicomechanical properties of melon fruits as an object of technical processing of peel, pulp, and seeds. To conduct studies of the physicomechanical properties of melon fruits, a methodology for experimental research has been developed.
Study of the influence of ionized fruit air
Authors: Rakhmatov A , Rakhmatov J , Nazarov O 
Published: July 2020

Abstract
The article presents the results of studying the process of storage of grapes in a fruit storage, identifies the main factors affecting the quality of storage of the product. The mechanism of the effect of ionized air on the stored product is considered and fruit storage modes are determined. The results of studies show the possibilities of determining the operating modes of ionization of fruit storage air.
Economic and statistical methods of frequency maintenance of biogas plants
Authors: Imomov Sh , Shodiev E , Tagaev V , Qayumov T 
Published: July 2020

Abstract
The article gives the importance of the technical operation of biogas plants and methods for their determination in the development of alternative energy sources from organic waste. When comparing the two methods in experiments: determining the frequency of maintenance by the acceptable level of reliability and the acceptable value and regularity of changes in the parameter of the technical condition of biogas plants. Their advantage is shown: in simplicity and the possibility of taking into account risk and taking into account the actual technical conditions of biogas plants (diagnostics), in the ability to guarantee a given level of reliability in taking into account variations in the technical condition. Also, the disadvantages of these methods are given, such as the impossibility of making full use of the resource of individual parts of a biogas plant, due to the fact that the frequency of maintenance (П0) is significantly less than the acceptable level of failure-free operation (ñ), in the absence of direct economic assessments of the consequences of biogas plant failures and the lack of direct consideration of economic factors and consequences. The need to receive (or have) information on the patterns of changes in the parameters of the technical condition. In connection with these, the article presents the results obtained by the method of economics and statistics, while it is shown that the technical and economic method is applicable to complex and expensive systems of units and assemblies that do not directly affect the safety of the biogas complex.
Mechanism for changing the rear axle clearance of a universal-tiller tractor
Authors: Akhmetov A , Botirov R , Abdurokhmonov Sh 
Published: July 2020

AbstractThe article is described the design of the mechanism for changing the clearance of the rear axle of a universal-tiller tractor from a low-clearance to a high-clearance position and vice versa. The most loaded place in the design of the mechanism for changing the clearance of the rear axle, which is the clip, is determined. The dynamic analysis of the load on the cage for three cases of loading in two sections passing through the bearing supports is carried out. At the same time, the main recommendations are aimed at ensuring a sufficient margin of safety in dangerous sections of the cage. In particular, one of the ways to ensure a sufficient margin of safety in dangerous sections of the cage is to use a material for its production - 45L steel. In Central Asia, all mechanized work on inter-row processing of cotton crops is carried out by a three-wheeled tractor adapted to the natural and production conditions of the region. Studies have established a negative technogenic impact of the front wheel of a three-wheeled tractor on the soil, which is eliminated by the use of a four-wheeled tractor. However, its use is constrained by the inadequacy of the agrotechnical passage. To solve this problem, LLC “DTCAM” is developing a four-wheeled tractor equipped with mechanisms for changing clearance, which provides sufficient agricultural cultivation for inter-row processing of cotton crops. Identification of dangerous places in the design of the mechanism for changing the clearance of the rear axle and dynamic analysis of the loads at this place, preventing breakdowns, increases the reliability of this tractor. It has been revealed that one of such dangerous places is a cage connected to the DCT cover, which accepts the main load transmitted from the tractor to the wheels and back. Dynamic analysis of the cage loads for various cases of loading in two sections passing through the bearing supports showed that the most loaded section is the section of the bearing support located on the DCT side. There is an insufficient margin of safety in this section when the tractor moves along irregularities. To ensure reliable operation, it is recommended to introduce the hardening of the cage area from the DCT side, where the bearing of the mechanism for changing the clearance of the rear axle is at least 35 HRCe, or use material - steel 45L.
Electrical technology of moisture content reduction of industrial-grade cotton seeds
Authors: Ibragimov M , Eshpulatov N , Matchanov O 
Published: July 2020

Abstract
The electric-contact heating method is proposed to be applied to reduce the moisture content of the industrial-grade cotton seeds to meet the relevant standard requirements. The rationale for safe heating conditions has been provided. The effect of different factors on the efficiency of the preliminary drying of seeds has been studied. Theoretical and graphic laws of the specific energy consumption change depending on different parameters have been defined. The obtained results prove the high efficiency of the proposed method: specific energy consumption decrease by 2.8 – 3.8 times against the existing technology.
Reliability indicators of stabilizing devices in the agriculture electrical supply system
Authors: Karimov R , Rasulov A , Shamsiyev K , Bekishev A , Kurbanova N , Musashayxova N 
Published: July 2020

Abstract
The article discusses the issues of reliability indicators of a voltage stabilizer built based on non-contact switching of a boost transformer and an autotransformer used for domestic consumers. The probability of uptime, which depends on the real mode of functional units and elements, is considered. The stabilizer equivalent circuit is given for calculating the reliability indicators taking into account the power unit and control. The failure rate of elements is specified taking into account correction factors. The schedule of uptime depending on the power and the failure rate and the probability of failure of the elements of the voltage regulator.
The stability stroke of cotton seeder moulder
Authors: Mamatov F , Mirzaev B , Berdimuratov P , Turkmenov Kh , Muratov L , Eshchanova G 
Published: July 2020

AbstractThe stability of moulder stroke affects the uniformity compaction of soil ridge. It depends on the mounting system of molder to the frame and the direction of act-ing forces on them. The aim of the study is to analyze the stability stroke of cot-ton seeder molder. The longitudinal stability of molder in a fixed system of coordinate dependency on acting forces on it, as well as its constructive parameters, have been considered. There has been obtained the equation for the determination of angular deviations of leads of parallelogram fastening system from the initial position under the influence of applied to the moulder forces, constructive parameters of sections, and unevenness of soil surface. It has been established that the fluctuation of links of the parallelogram mechanism is mainly influenced by the weight of mass of moulder system, soil resistance forces, the initial angle of links inclination and force pressure of the spring group. The stability of moulders work is ensured mainly by changing due to the changing force pressure of the spring group.
Justification of parameters of electric activator applicable to reduce mineralization of collector-drainage water
Authors: Ibragimov M , Turdiboyev A 
Published: July 2020

Abstract
The article substantiates the relevance of the problem of using collector-drainage water and the advisability of using electroactivators for this purpose. It is of scientific and practical interest to use diaphragm electroactivators for demineralization of collector-drainage water, using the principle of electrochemical activation due to unipolar treatment of agricultural effluents. Unipolar treatment reduces the degree of mineralization, changes the chemical composition, increases the electrodynamic properties, and makes it possible to treat water to the required degree. Prior to the experiments, the main factors and optimization parameters were identified, and a planning matrix of the experiment was drawn up. The experimental results allow us to identify the degree of correlation of the optimization parameter with the main factors. Using the Box-Benken method, the optimal parameters of the electroactivator are found.
Reducing the energy capacity of the cutting of stem fodder
Authors: Alijanov D , Abdurokhmonov Sh , Jumatov Y , Bozorboev A 
Published: July 2020

Abstract
In the paper provided efficiency analysis different types of feed processing with purpose decreasing energy use in cutting stalk crops and creating appropriate cutting units, also study results in assescment energy use in cutting with a rectangular knife and received formulation cutting strength change, the results of a change of knife for case in cutting of prebend stalk of various sizes. Results of theoretical research of catting work, the tensile stress of the upper fiber, stresses on the blade of the knife which is necessary for the destruction of the fiber. The use of pre-bending during the cutting of cutter material reduces the cutting work in comparison with the cutting work is 201.12 N cm this is compared to the chopping 290 N cm reduces cutting performance by 35.05 percent.
Optimization of vibrator parameters cotton bushes
Authors: Mirnigmatov B , Avazov I 
Published: July 2020

Abstract
The article presents issues related to the cultivation and harvesting of cotton in Uzbekistan, as well as the need to ensure a high-quality machine harvest. The purpose of growing plants to increase productivity from cotton bushes. Experimental studies of the simulation of the vibrator drive are carried out in laboratory conditions on a specially designed stand, consisting of two samples and made in full size. We conducted multivariate studies, i.e. mathematical planning of the experimental and obtained results adequately describes the technological process of the vibrator and allows to determine its parameters. The solution of mathematical models, with known input numerical values, made it possible to determine the rational parameters of the vibrator: the minimum unevenness of rotation of the carrier is Ω=6.4829%; the maximum moment on the motor shaft is M

max
= 2.95825 N m and the degree of dynamism is H=684.8659 rad/s2.
Cutting length the fodders of green stalks by drum chopper
Authors: Borotov A 
Published: July 2020

Abstract
In Uzbekistan, special attention is paid to the development of livestock, poultry, and fish farming. In the ration of animals, green fodder obtained by cutting green stalks corn, alfalfa and other feed crops have a special place. For high-quality chopping of stalks with the required cutting length for each type of animal, a chopper has been developed with a simple design for chopping green feed. Testing of the chopper work, carried out at an engine speed of 2800 rpm, a cutting drum rotation speed of 950 rpm and in two rotations of the feed rollers 10 rpm and 20 rpm with an average length of alfalfa stalks 71.6 cm and an average length of corn stalks 216.4 cm, showed that at a feed roller rotation speed of 10 rpm the average cutting length of the stalks was 10.6 mm, and at a feed roller rotation speed of 20 rpm - 17.6 mm. It can be seen from the data that with a twice increase in the feed roll speed, the cutting length increases 1.66 times, which confirms the theoretical assumptions obtained.
Approaches to assessing the resource potential of Central Asia in a climatic resource-constrained environment
Authors: Elistratov V , Bogun I , Kasina V 
Published: July 2020

Abstract
The object of research in the article is the methodology of evaluation and calculation of the wind energy resource for the design of wind power plants in Central Asia. This methodology is based on the approach for determining the wind resource in conditions of insufficient climate data developed by REC “RES” of Peter the Great St. Petersburg Polytechnic University. The energy industry of Central Asia, like the world energy industry, seeks to increase the use of facilities based on renewable energy sources, which is caused by several factors: environmental, economic, social, and so on. The global energy industry is implementing a “green” energy transition, largely due to government policy, thereby several strategies and decisions have been adopted in Central Asia. At the moment, the installed capacity of renewable energy sources in Central Asia is 13747 GW. The methodology for evaluation of wind energy resources has been developed, and a resource potential has been calculated in the city of Aktau in Kazakhstan. The methodology includes a 3-level evaluation system and calculation in the WindPRO software. This methodology guarantees the accuracy of calculating the wind resource up to 90-95%.
Technological basis for sowing winter wheat in the rows of growing cotton
Authors: Igamberdiyev A , Alikulov S , Berdimurodov U , Usarov O , Razikov N 
Published: July 2020

Abstract
A scheme of the technological process of work and the design of the opener of the sowing machine for sowing winter wheat in the rows of cotton are proposed. Increases the efficiency of cultivation technology compared to the traditional maximum use of the furrow profile. Comparative analyzes of the methods of cultivating winter grain cultivations are made. Narrow-row sowing of winter wheat in the rows between growing cotton with a sowing rate of 180-200 kg/ha is recommended.
Determination of resistance to gravity of working body with the pit softener installed in the two-layer plow during the main tillage
Authors: Murodov N , Khasanov U 
Published: July 2020

Abstract
This article is about the benefits of using an energy-efficient vertical soil that is designed to treat plow and plow soil without plowing, and advantages of inferior soil with fertile soil during plowing. In summary, the purpose of the proposed technical solution is to improve the reclamation condition of the soil by loosening the birch layer (plowing with the simultaneous loosening of the subsoil) and to reduce the tensile resistance of the plow during plowing. Simultaneously with plowing through the recommended deep softener, energy savings are achieved by loosening the subsoil layer and improving the movement stability of the plug.
Justifications of the longitudinal distance between the bodies of a two – tier plow
Authors: Tukhtakuziev A , Kurbonov K , Khamidov F 
Published: July 2020

Abstract
The article presents the results of theoretical research on the justification of the longitudinal distance between the bodies of the plough analysis of previous theoretical studies applied graph-analytic research methods and determined the smallest longitudinal distance that provides an unobstructed passage and rotation of the formation between the bodies of the soil.
Advanced device for cleaning drain wells
Authors: Lee A , Usmonov T , Norov B , Melikuziev S 
Published: July 2020

Abstract
The article presents cleaning technologies and considers an improved device for cleaning drainage wells, which allows to increase the productivity and quality of cleaning drainage wells, reduce labor costs, and water consumption. The device is simple, reliable, and highly maintainable, allowing you to operate it in the mode of economy and consumption of a large volume of water. The proposed device received a copyright certificate for the invention. A cable system is provided in this device, and a ruff head is stretched inside the drainage pipe, which has the ability to deviate and rotate along the longitudinal axis of the drainage pipe, the ruff is pulled by winches through adjustable and fixed blocks, and the mounting frames are installed in inspection wells and fixed with bolts and successively reinstalled from one well to another. Theoretical prerequisites have been developed for determining the maximum force in the closing, hoisting rope, the required power for closing the jaws and lifting the bucket, the diameters of the corresponding drums and ropes.
Low - speed generator with permanent magnets and additional windings in the rotor for small power wind plants and micro hydro power plants
Authors: Baratov R , Pirmatov N 
Published: July 2020

Abstract
Recently due to the worldwide population grows much attention has been paid to increasing total electricity generation. However, traditional power plants, which are used hydrocarbon fuels, cause one of the challenging problems like environmental contamination and global warming in the world. In this case, renewable or alternative energy sources can be a promising replacement for traditional hydrocarbon fuels. Uzbekistan has lots of small rivers and water reservoirs and the use of these potentials in the perspective to generate power it is a unique decision of the problem. Usually in small power plants use low-speed generators and efficiency of these type generators are very low. Hence, the main objective of this study is to increase the efficiency of the low power generator by improving and optimizing the specifications and parameters of the low power generators. The use of low-speed generators with permanent magnet excitation for micro-hydroelectric power plants and wind turbines is relevant in terms of providing good weight and size indicators, simplicity of construction, lack of sliding contacts, with the ability to perform a generator of low rotation speeds, which causes low cost and high reliability. In this study, the natures of the influence of the main geometric dimensions of the mass-dimensional parameters and the air gap on the energy indicators of the generator are estimated. Theoretical and experimental research results are submitted.
Torsional vibrations of a cylindrical shell in a linear viscoelastic medium
Authors: Safarov I , Teshaev M , Toshmatov E , Boltaev Z , Homidov F 
Published: July 2020

Abstract
In this paper, we consider the natural vibrations of inhomogeneous mechanical systems, i.e., cylindrical bodies located in a deformable viscoelastic medium. The theory and methods for studying the natural vibrations of a cylindrical shell in a viscoelastic medium are constructed. The viscoelastic properties of the medium are taken into account using the hereditary Boltzmann-Walter theory. For the statement of the problem, the general equation of the theory of viscoelasticity in the potentials of displacements in a cylindrical coordinate system is used. An algorithm has been developed to solve the tasks posed on a computer using the Bessel, Hankel, and Mueller and Gauss methods.
The considered problems were reduced to finding complex natural frequencies for the system of equations of motion of a cylindrical shell in an infinite viscoelastic medium using radiation conditions. It is shown that the problem has a discrete complex spectrum. The eigen frequencies of oscillations of a low-contrast heterogeneity are found. Revealed that the imaginary part of the eigen frequencies is comparable with the real one, which can lead to aperiodic movements of the systems considered.