bluuebunny/crossref_metadata_2025 huggingface dataset:
Study of coulometric method of gas analysis for analytical control and monitoring of harmful components in the air environment
Authors: Yusupbekov Nodirbek , Gulyamov Shukhrat , Mukhamedkhanov Ulugbek , Eshmatova Barno , Bandenok Elena
Published: July 2024

The results of research of the method of determination of toxic substances in the composition of gas-air medium providing high efficiency of continuous monitoring, control and management of the content of harmful components in gas mixtures on the examples of continuous monitoring of the content of mercaptans in the natural gas of technological lines of gas processing and chemical plants are presented. The basic regularities of the methods of direct and indirect coulometry in determining the concentration of mercaptans in a gas mixture have been studied. As a result of the study of the measurement conversion processes occurring in electrochemical cells with sensitive elements - gas-diffusion hydrophobised electrodes, the choice of a promising design of the gas analyser intended for determining the concentration of mercaptans in natural gas in the range of 0-100 mg/m3 and hydrogen sulphide in the range of 0-50 mg/m3 has been justified.
Importance of technological properties of Jerusalem artichoke
Authors: Barakayev Nusratilla , Beshimov Yusuf , Beshimov Murodjon
Published: July 2024

Nowadays, providing the world’s population with quality food products and controlling food safety is one of the important tasks. Implementation of innovative technologies of high-quality processing while fully preserving biologically active substances contained in food and medicinal plants and its prospective development are becoming increasingly important. In this regard, it is time to create, improve and introduce new technologies, i.e. integration of science and education production, in order to produce ecologically clean, competitive and quality food products of various types. Full analysis of physical, chemical, mechanical properties of local agricultural products, scientific justification of technological processes is given special attention. Jerusalem artichoke, one of the agricultural plants, contains polysaccharide compounds, organic acids, salts, minerals, inulin, macro and microelements, fiber (substance composed of plant cells), pectin, vitamins, essential oil, starch, carbohydrates, protein, amino acids and other substances. The selection of the optimal operating mode of the equipment used in the technological processes in the process of processing with preservation is of great scientific and practical importance.
Integration aspect in the use of digital technologies for the sustainable development of the timber industry complex of Uzbekistan
Authors: Jurakulov Sanjar , Kasimova Rano , Eshmuratova Dildor
Published: July 2024

The article raises the issue of the relevance of introducing information technology into aspects of the activities of forestry enterprises in order to increase sustainable development, operational efficiency, and also reduce the negative impact on the environment. The forestry industry is considered in terms of decomposition into areas of activity that make up the structure, problems of business processes and information infrastructure. Based on the research results, a stack of tasks related to the development, reengineering and support of enterprise information infrastructure components is formed, the solution of which will allow us to develop a strategy for optimizing business processes and digital transformation, which in its concept should reflect the use of modern methods of lean and environmentally friendly production.
Hardware realization of collision avoidance method in VLF-LF frequency bands in mine conditions
Authors: Krasnov Timur V. , Romanov Viacheslav V. , Kohonkova Ekaterina A.
Published: July 2024

The paper proposes a method of measuring the distance between mining equipment and workers in complex conditions of underground mine workings considering the influence of absorbing properties of rocks and the presence of turns and obstacles. The method consists in using a magnetic beacon, operating in VLF-LF frequency range, on the body of mining equipment and receivers on the miner's body to register proximity and notify a person about it. Registration of convergence is carried out by RSSI methods. The authors propose a design solution of magnetic beacon and receiver, which includes amplification stages for signal registration at 30-35 meters. The paper also presents the measurement error of the information parameter under the influence of the ground surface and the tunnel.
Features of the examination of project documentation for ensuring fire safety of oil industry facilities
Authors: Mukhametzyanov Nazar , Rubtsov Aleksey , Mukhametzyanov Zinur
Published: July 2024

The article presents the issues of researching the existing system of expertise of design and estimate documentation in order to determine potential reserves for improving the quality of measures being developed to ensure fire safety of facilities.To solve this problem, studies of the existing basic provisions on the examination of design and estimate documentation for assessing the level of fire safety of the facility were carried out. A review and detailed study of the requirements for the examination of design and estimate documentation in terms of ensuring fire safety of construction facilities contained in regulatory and technical, reference, industry and departmental profile documents. Based on the data obtained, conclusions are drawn about the need to improve the examination procedure of project documentation in order to increase the reliability of fire safety assessment of projects for the construction of oil industry facilities through the use of a quantitative indicator to verify the effectiveness of fire safety measures being developed.
Analysis of the thermal power hydraulic system in undisturbed state
Authors: Sazonova Svetlana Anatolyevna , Chernikov Eduard Anatolyevich , Storodubtseva Tamara Nikanorovna
Published: July 2024

The development of a model for the analysis of the undisturbed state of a heat-power hydraulic system - a heat supply system, which is an important stage in the design and optimization of the system, is considered. The main parameters of the system, such as thermal loads, heat flows, heat transfer through pipes and heat exchangers, the location and characteristics of equipment (boilers, pumps, etc.) are analyzed. The development of a mathematical model of the system, which should take into account all the main factors affecting heat exchange and the efficiency of the system is completed. The model as a system of equations and includes such parameters as temperature, pressure, coolant flow, etc. is presented. Based on this model, it is possible to analyze various operating modes of the system, optimize parameters and make decisions to improve it. When developing the model, the possibility of various perturbations is taken into account. To analyze the undisturbed state of the system, the influence of such disturbances is excluded and its basic operation is considered. When developing a flow distribution analysis model for a thermal power system, energy equivalence was applied. The developed model of analysis of the undisturbed state of the thermal energy system will allow more accurately design and control such a hydraulic system, improve its efficiency and reliability.
Determination of the angle and speed of interaction of cotton seed rush with the multifaceted screen drum of the separator
Authors: Juraev Dadakhon , Djurayev Anvar , Umarov Shakhzod , Manglieva Juragul , Obitov Nasriddin , Eshbaeva Zokhida
Published: July 2024

An effective separator circuit is recommended for separating cotton seeds. The results of theoretical studies to determine the recommended values of the angle and speed of impact of the cotton seed crusher with the mesh surface of the separator drum are presented. Using the theory of impact, a formula was obtained to determine the angle of impact of the cotton seed crusher on the multifaceted mesh surface of the drum, and an expression was derived for calculating the reaction force upon impact of the crusher. Using a numerical solution, graphical dependencies of the parameters were constructed. The values of the reaction force during the impact interaction of the crushed seeds on the mesh surface of the separator drum are determined.
Mathematical model and analysis of the dynamics of a system of the screw-cutting lathe
Authors: Urinov Nodir
Published: July 2024

Analysis of machining processes on metal-cutting machines is an important area of research in the field of metal processing. The purpose of this research is to study machining processes on metal-cutting machines in order to improve the efficiency and quality of processing. In order to achieve this purpose, an analysis of cutting processes and machining processes is carried out. The influence of cutting conditions on the machining process, such as the position of the part and tool, feed and depth of cut, is considered. As the object of research of the operating modes of a metal-cutting machine, 16K20 screw-cutting lathe was chosen as the most widely used type of machine. The 16K20 screw-cutting lathe is a metalcutting machine that is used for processing various metal parts. The article covers a mathematical model of the system “frequency-controlled electric drive – asynchronous engine – metal-cutting lathe” that allows evaluating and analyzing the dynamics of the system, predict its behavior under various conditions and optimize operating parameters in order to achieve optimal results.
Development of a mathematical model for analyzing the perturbed state of a thermal power hydraulic system
Authors: Sazonova Svetlana , Shcherbakova Irina , Akamsina Nadezhda , Mozgovoy Nikolai , Sokolova Olga
Published: July 2024

The results of developing a model for analyzing the perturbed state of a thermal power hydraulic system are presented using the example of a heat supply system. The parameters of the operating mode of the thermal power hydraulic system were assessed after exposure to disturbing factors. It is noted that the choice of boundary conditions must be carried out taking into account the use of energy equivalence when analyzing the perturbed state of the investigated fragment of the hydraulic system. The developed model of steady flow distribution with non-isothermal flow of a viscous medium is presented. It is concluded that the developed mathematical model represents a qualitatively new approach to formalizing problems of flow distribution analysis in systems with adjustable parameters. The model can be considered as a generalized form of representing particular models of flow distribution when describing the object under study, which can be considered as a hydraulic circuit with adjustable parameters for nonisothermal flow of a viscous medium. It is shown that this model can be used to analyze and describe the flows and properties of a viscous medium in systems where it is possible to regulate parameters and non-isothermal flow is taken into account.
Managing greenhouse gas emissions using a neural network from gas generating plants
Authors: Kulakova Ekaterina , Muravyova Elena
Published: July 2024

This article describes a method for developing a neural network model for the control system of gas generator sets, which are an efficient and environmentally friendly way of energy production. Gas generator sets are used to convert solid fuels such as coal or wood into synthesis gas, which can then be used to generate electricity or other types of thermal energy. The article describes a method for developing a neural network model for a wood chip gas generator for preparing a fuel recipe. The article also discusses the advantages of gas generator sets, such as the possibility of using inexpensive and affordable fuels, reducing emissions of greenhouse gases and other harmful substances, as well as improving energy efficiency. The article provides useful information about gas generator sets and their role in providing environmentally friendly and efficient energy.
Physico-chemical and physical-mechanical exposure of cotton seeds
Authors: Usmanov Botir , Kadirova Nafisa , Hamrakulova Muborak , Sattarova Barno
Published: July 2024

This study provides information on the physicochemical and physical-mechanical properties of cotton plant seeds. The physical and mechanical characteristics of cotton seeds are crucial for the design and operation of storage facilities, bunkers, transport devices, and machinery in preparatory workshops. Proper ventilation is essential when storing, transporting, and handling oilseeds, as the presence of carbon dioxide can pose safety risks. The study highlights the importance of monitoring carbon dioxide levels in oil warehouses, galleries, tunnels, and pits associated with oilseed transportation, with a maximum allowable concentration of 0.5% by volume. Stationary or mobile devices should be used to monitor carbon dioxide levels according to a schedule approved by the chief engineer of the enterprise. This information is crucial for ensuring the safe and efficient handling of cotton seeds and other oilseeds.
Dynamics of the Lower Volga region agricultural landscapes under the influence of climate change
Authors: Reshetnikova Radislava , Kovaleva Natalia
Published: July 2024

The Lower Volga region soil cover underwent changes during the Late Holocene as a result of the natural and anthropogenic factors influence. Changes in climatic conditions and soil-forming processes were imposed on the settlements construction and agricultural use of land in the XVIII century and on the organization of reservoirs on the Volga-river in the XX century. The medieval climatic optimum was characterized by humid soil formation conditions in the steppe and dry steppe zones, which contributed to the flourishing of the Golden Horde settlements, the desalinization of steppe soils and favored agriculture. The small Ice Age that began from the XVI century led to the decline of settlements and negative soil processes. The soils and cultural layers of the settlements of the Volga Germans who occupied these territories in the XVIII century are characterized by an increase in morphological signs of salinity and the content of carbonates and sodium. In addition, due to climate change and the effects of deforestation, soil erosion has intensified. Slope and landslide processes intensified as a result of the construction of reservoirs on Volga in the XX century. It led to increased degradation of soils, settlements and rural landscapes of the Volga right bank.
Innovation to ensure sustainable development in the coal industry
Authors: Zotov Maksim
Published: July 2024

The rapid growth of mineral extraction and its use in the fuel and energy complex, particularly in the coal industry, has led to a significant global environmental impact. This has resulted in increased harm to both the environment in production and use regions, as well as to the global population. Furthermore, significant negative social effects are observed, including harm to human health and well-being. In response to these negative consequences, many countries have introduced stricter environmental protection measures to ensure long-term preservation of life and health.
Preparation of lime-sulphur containing ammonium nitrate
Authors: Takhirova Nargisa
Published: July 2024

The article presents the processes of obtaining magnesium (lime ammonium nitrate) LAN based on the granulation of dolomite-sulfatenitrate liquids obtained by adding DM and (NH4)2SO4 to AN liquid, as well as studying the composition and physico-chemical properties of ready-made fertilizers. It was found that, based on the determination of the physical and mechanical properties of various mine dolomite minerals, their suitability for use as a modifier for saltpetre was proven. The addition of dolomite mineral from 100:3 to 100:45 weight ratio and (NH4)2SO4 in the amount of 3 to 10% of the total mass of dolomite-nitrate mixture to the AS fluid increases the strength of OAN grains by 2-8 times and viscosity by 2-4 times was found to decrease. It was found that in the presence of DM and (NH4)2SO4, the decomposition temperature of ammonium sulfate (AS) increased from 211°C to 262.7°C. By adding dolomite mineral (DM) and (NH4)2SO4 to Ammonium nitrate (AN) liquid, technologies for obtaining complex fertilizers with good physicochemical and commercial properties, with a content of not less than 34% and not more than 28% for export, were developed.
Analysis of the physical-mechanical properties of t-shirt fabric with different fiber composition
Authors: Muminov Kodir , Khamrayeva Sanovar , Toshpulotov Laziz
Published: July 2024

The physical and mechanical parameters of shirt fabrics with different fiber composition are analyzed in the article. According to the analytical results, the results of the penetration, breaking strength, breaking elongation, wrinkle resistance, air permeability, friction resistance of shirt fabrics after washing are presented, and the changes of the results of these indicators are described in the graphs. According to the analytical results, it was determined that the quality of shirting fabrics is affected not only by its fiber composition, but also by its weaving. As a result of the comparative analysis of physical and mechanical parameters of fabrics with different fiber content in six options, it was found that the fabric with 35% polyester and 65% cotton fiber content in option 4 is higher than other options. In textile enterprises, it is recommended for the production of shirt fabric of the fourth option, which has high air permeability, high strength, no wrinkling, and low shrinkage after washing.
Analysis of yarn structure and equipment for determining yarn properties
Authors: Giyasova Dilfuza , Khamrayeva Sanovar , Shumkarova Shamsiya
Published: July 2024

The effective application of local raw materials, cotton fibers, wool and downy plants, the production of natural blended threads, improving their physical and mechanical properties in order to ensure the production of high-quality export products with a new blend composition are covered in the article. The yarn of 20% wool, 30% cotton, 50% polyester fiber has been analyzed. It has been established that fiber index results are higher than 100% cotton fiber. This indicates that the use of 50% polyester to solve the problem of allocating cotton growing areas to growing other agricultural products and reducing cotton growing areas, which affects the production of products, and that was considered as saving cotton fiber in such a percentage.
Method of design of heroic transmission
Authors: Abramov Vyacheslav V. , Rybin Vyacheslav V. , Troyakov Konstantin V. , Kardash Artem A. , Ivanov Alexey Yu.
Published: July 2024

This document describes how to construct a heroic transmission used in the mechanization of agricultural machinery. The article discusses the basic principles, design features and advantages of heroic transmission. Various methods of designing heroic programs are also considered. Based on the information considered, a method for designing a heroic transmission was developed. Based on the calculation, sketches of the impeller of the hero gear were developed. Based on the sketch of the outer wheel and the eccentricity, the obtained data were substituted into the parametric equation of the eccentroid cycloid, the profile of which is the basis for the construction of the inner wheel of the rocking pair. Based on the sketch, a 3D model of heroic transmission was developed, which was based on mathematical modeling.
Mathematical model of the running system of combine harvesters
Authors: Partko Svetlana , Sirotenko Andrey , Sokolova Viktoriia , Yumagulova Venera
Published: July 2024

Various factors affect the performance of mobile agricultural machinery, including the impact of the operator and external loads. The analysis of these factors is an urgent task, since the identification of patterns of their occurrence allows, if not to eliminate the cause, then to predict the malfunction and adjust the equipment of service centers. Various methods and criteria are used to assess the resource of machine units: an approximate assessment of reliability characteristics was carried out on the basis of statistical material on the submitted failures of 180 machines (NΣ=180), which was the result of incomplete resource tests; differential equations were compiled using the Lagrange method. During the resource tests and according to the results of operation, material was collected on the failures of the undercarriage units of the combine and breakdowns of their parts. The developed model of the combine allowed to perform an amplitude and frequency analysis of the chassis of the chassis system when driving on country roads and to assess the smoothness of the machine and the working conditions of the operator. In addition, it allows you to rationally choose the speed at which over-resonant or pre-resonant ranges of operation will be provided.
Machine learning and AI in graphics development
Authors: Umarov Husan , Mirzaraimova Vasila , Yakubova Muyassar , Tashpulatov Ravshanbek
Published: July 2024

The fusion of software computer graphics and development technologies has revolutionized the digital landscape, opening new frontiers in visual storytelling, interactive experiences, and digital innovation. This article explores the latest advancements, techniques, and trends shaping the dynamic realm of computer-generated imagery, animation, virtual reality, and development tools. From advanced rendering techniques like ray tracing and global illumination to the immersive worlds of virtual and augmented reality, software computer graphics are transforming how we perceive and interact with digital content. Development technologies such as game engines, graphics APIs, and shade programming empower creators to craft visually stunning and interactive experiences across a wide range of platforms. The abstract delves into the intricacies of animation tools, virtual reality design principles, and the integration of machine learning and AI in graphics development. By examining the synergy between artistry, technology, and innovation, this research illuminates the transformative potential of software computer graphics in creating engaging narratives, dynamic visual content, and interactive digital environments.
Mathematical description of the interaction process in a roll module
Authors: Khurramov Shavkat , Nurmanov Sarvar , Imamnazarov Shonazar , Sattorov Shakhriyor
Published: July 2024

An analysis of the shape of the contact arc in the roll module was performed for the case when changes in the thickness of the material and the roller coating at each point of the contact zone occur in the radial direction to the roller axis. Mathematical models of the shape of the contact arc of the roll module were developed. Particular mathematical models of the contact arc shape were obtained for the cases when the material being processed is absolutely elastic, elastic-viscous, and plastic. It was determined that the shape of the contact arc in the roll module depends primarily on the geometric and deformation properties of the roller material and the roller coating.
Stress distributions along the roll contact arc
Authors: Nurmanov Sarvar , Imamnazarov Shonazar , Sattorov Shakhriyor
Published: July 2024

The article provides the results of a mathematical description of the distribution of contact stresses of a roll module with smooth rollers. Analysis of the developed models shows that when the rollers rotate, the maximum of the normal stress distribution diagram is displaced in the direction opposite to the movement of the material being processed; the displacement depends on the properties of the material being processed and the forces acting on the rollers. Under static contact, shear stresses are distributed symmetrically relative to the line of centers. In the same way, they are distributed along the arc of contact of the rotating roller close to rotational resistance equal to zero. As the rotational resistance increases, the distribution changes and becomes asymmetrical. In the drive roller, the neutral angle shifts in the direction opposite to the movement of the material, and the free roller, it shifts along the direction of movement.
Modeling contact stresses in roller mechanisms
Authors: Toshkhujaev Alisher , Sadykov Adkham , Umarov Dilshod , Abdukarimov Abdisalam
Published: July 2024

The results of the interaction of elastic-viscous material with a roller mechanism are given in the article. Mathematical modeling of contact stress distribution in a roller mechanism interacting with the elastic-viscous material being processed, in cases with driven and free rollers, and under static contact, was conducted. It was revealed that the distribution of contact stresses, both under static contact and during movement, is directly related to the properties of the material being processed. The pattern of distribution of shear stresses is related to the type of kinematic link in the roller mechanism, and, accordingly, the nature of the external forces acting on the roller during the implementation of technological processes.
Grain movement between the cylinders of a semi-automatic rotary dryer during heating
Authors: Nikolaev Vladimir , Troyanovskaya Irina , Vanzha Vladimir , Akhtyamova Leisan , Mirzoeva Maryam
Published: July 2024

The drying efficiency depends on many factors, in particular, on the movement of grain in the space between the outer cylinder and the inner cylinder during its heating and drying. During these periods, the grain layer in the space between the outer cylinder and the inner cylinder was divided into three sublayers: A, B, C. In sublayer A and sublayer B, not only convective heating of the grain will be carried out, but also heat transfer by the grain during its heating. In sublayer B, only convective heating of the grain is carried out, almost no heat transfer is carried out by the grain. Therefore, the presence of sublayer B is undesirable, or its thickness should be minimal. The only possible way to reduce the thickness of the sublayer B is to increase the width of the blades on the inner cylinder. On the other hand, an increase in the width of the blades on the inner cylinder will lead to an increase in the ratio of air flow velocities along the perimeter of the inner cylinder. Finally, the optimal width of the blades on the inner cylinder can be determined only after calculating the entire grain drying process.
Study of natural oscillations to ensure seismic resistance of underground structures
Authors: Abidov Kamiljan , Saliyeva Olima , Ergashev Bakhtiyor
Published: July 2024

The scientific research illustrates that the eigenfrequencies of vibrations of an elastic spherical layer located in an infinite elastic medium are investigated. The problem of natural and forced oscillations is solved by reduction to a plane problem of elasticity theory. The spectrum of complex natural frequencies for spherical mechanical systems in an elastic medium is obtained in this work depending on various geometric and mechanical parameters of the system.
Methodology for assessing the dynamic properties of transmissions forestry machines with a bar working body
Authors: Saaya Sai-Suu , Orlovskiy Sergey , Dolmatov Sergey , Ariko Sergey , Alekseeva Svetlana , Sakhapov Rustem , Akhmetshin Stanislav
Published: July 2024

The studies talk about the features of moldboard and milling tillage. An analysis of current trends in the field of soil cultivation allows us to conclude that currently special attention is paid to reducing the energy intensity of the processing process. Forestry machines with bar working bodies have undoubted advantages over moldboard and milling machines, since during their operation they require much less power. Two transmission schemes were considered - chain and branched. When considering chain circuits with several variants of flywheels and passive working bodies, significant amplitudes of oscillations in transmissions appeared in the region of natural frequencies, and resonance phenomena when the frequencies of forced oscillations coincided with natural ones. Calculations have shown that an increase in the moment of inertia of the tractor engine flywheel by 3.14 times does not have a significant effect on the change in the natural frequencies of oscillations in the propulsion drive transmission, but causes them to decrease by 1.4 times. It follows that when the moments of inertia of rotating masses change, it is necessary to analyze the vibrations that occur in branched transmissions with active bar working bodies with significant moments of inertia.
Spatial and ecological structure of the sockeye salmon population Oncorhynchus nerka of Kuril Lake
Authors: Khrustaleva Anastasia
Published: July 2024

This study examines the genetic structure of sockeye salmon populations in Kuril lake basin, focusing on the allelic frequencies of SNP loci that potentially carry an adaptive load. Our results reveal the division of sockeye salmon populations into three distinct groups: early river sockeye salmon and two groups of littoral sockeye salmon from the southern and northeastern shores of the lake. This division is supported by the genetic data, which shows that the populations are genetically distinct and have distinct allelic frequencies. Additionally, our analysis reveals that the neutral structure of the population is rather shallow, with only minor differences found between the two ecotypes of sockeye salmon - stream and littoral. These findings suggest that the genetic differences between the populations are primarily driven by adaptive processes, rather than neutral genetic drift.
Of the quality of the results of the state assessment of soil and landscape objects
Authors: Musyal Alexander V. , Zhilyakov Dmitry I. , Dolgopolova Natalia V. , Malysheva Ekaterina V. , Novikova Tatyana M.
Published: July 2024

An analysis of the current state of agriculture in the Russian Federation has shown that the recently aggravated economic and environmental problems require significant changes in the technologies used towards their biologization and resource conservation while ensuring the profitability of agricultural production. Increasing crop yields can be achieved only with a high culture of agriculture, the introduction of advanced technologies based on the widespread use of various types of organic fertilizers (manure, straw, siderate) and biological plant protection products and growth regulators. This requires in-depth study of the most important zonal aspects of agriculture, one of which is to determine the relationship between soil fertility and crop productivity with systematic fertilization. Therefore, the development of crop cultivation technologies that ensure high and sustainable yields with high quality, excluding the introduction of increased doses of mineral fertilizers, chemical plant protection products, as well as minimal negative effects on the soil is an urgent task of great theoretical and practical importance.
Substantiation of the optimal angle of intersection of the milling cutting strip determining losses and dilution
Authors: Yermekbayev Umidjon , Tuychiyeva Dilnoza , Giyazov Otabek
Published: July 2024

This study proposes innovative technological schemes for openpit mining to reduce costs by minimizing transportation distances. The schemes involve dividing the mining front into sections, mining sections with overburden benches that undercut the mineral layer, and mining benches with the placement of rocks in internal dumps and the advancement of the dump front after bench mining. The research identifies optimal mining block schemes and parameters that maximize productivity. Additionally, the study highlights actual losses in production time due to organizational set and provides strategies to achieve combine efficiency.
Modeling the concentration profile of the solid phase during hydrotransport of ore in pipes
Authors: Pankov Andrey , Pankova Oksana
Published: July 2024

The authors consider the calculation of movement modes for unstructured suspensions in horizontal pipes. The movement mode in these cases is conventionally defined by the proportion of the concentration at the top of the pipe and in its middle. According to multiple authors, the flow carrying capacity is determined by its average velocity. This provides an opportunity to define the solid phase concentration profile along the vertical separately from solving the movement equations. This article presents an equation to determine the vertical distribution of the concentration obtained as a balance between turbulent pulses and the gravitation settling of solid particles. The analysis of solutions showed that there is a strong dependency between solid phase distribution and its average concentration in the flow. The comparison of movement mode calculation results obtained using the developed mathematical model and popular empirical dependencies showed good correlations. The obtained concentration profile can be used for the simplification of the general mathematical model of hydrotransport by predicting the motion mode and setting the concentration profile. This shall reduce the number of equations solved in the hydraulic fluid movement model and simplify the subsequent modeling of unstructured suspension movement in pipes.
Analysis of physical and morphological parameters of silk fibers in the aesthetic properties of silk fabrics
Authors: Tukhtaeva Zebo , Abulova Parvina
Published: July 2024

This article outlines the issues of providing the medium-sized industrial sector with natural fiber products, analyzing the aesthetic properties of fabrics in the production of fabrics that meet the aesthetic and hygienic requirements of consumers for a wide range of modern clothing, and determining the use of silk fabrics according to physical and mechanical characteristics. In the production of consumer goods in accordance with the needs of the population, the specific characteristics of gauze, including the connections between the air permeability of gauze and its filling with fiber, hygienic and hygroscopic, air and vapor permeability, the type of fabric, fiber composition, aesthetic properties, quality indicators are also analyzed. Aesthetic properties of gauzes are physical and morphological indicators, that is, color and given pattern of gauzes, hardness and layer formation; glossiness, depending on the structure of the surface level and evaluated parameters - it is determined that it depends on the requirements such as application, meeting the customs of the time and fashion trends. As a result of the research, in order to expand the scope of consumption of gas products, proposals were made to improve the production assortment, after studying the needs of consumers of different categories and nationalities.
Study of technological parameters of ion exchange resins and technology of recultivation of off-balance uranium-containing dumps
Authors: Sanakulov Kuvandik , Sharafutdinov Ulugbek , Razhabboev Ibodulla , Khamidov Rustam , Khamidova Madina
Published: July 2024

The article presents the technology of uranium extraction, the results of uranium extraction from recultivative dumps, physicochemical and technological properties of applied resins, as well as the state of radiation and ecological situation in the area of uranium ore mining enterprise location around the town of Uchkuduk (Uzbekistan). Nowadays, worldwide scientific research is being conducted on the return of technogenic waste to the main processing, application of high-quality sorbents based on chloride ions in the process of obtaining the finished product, uranium recovery in the process of sorption, improvement of the main indicators of uranium production and processing of technogenic dumps by means of their return. In this regard, it is necessary to develop physicchemical and technological fundamentals of technogenic waste processing, recultivation of sites, study the properties of anionites sorbing uranium in the process of uranium waste processing with highly concentrated solutions of chloride ions, pay special attention to scientific research on uranium extraction under conditions of seasonal low temperatures in the process of sorption.
Disc rotary plough for agriculture mechanization
Authors: Ishmuradov Shuxrat , Hamroev Ramzjon
Published: July 2024

This article presents the design of a disc rotary plough and the results of tests conducted on the MTZ-82 tractor. The driven unit does not divide the field into planks, but moves in a shuttle way and performs smooth ploughing without formation of furrows and ridges. For this purpose, the main diagonal plough frame is rotated around a pivot by means of a pivot mechanism, i.e. a hydraulic cylinder, and is brought into working position by turning the soil plates to the right and left. While setting the diagonal plough frame to the right or left side in operation, the posts hinged to the frame are rotated around their axis by means of a pivoting mechanism and a rod, ensuring that the angle of the working disc is maintained and is in a convenient position in relation to the direction of travel. At the same time, the plough's support wheel is rotated by 180° and is moved to the desired position by means of a link.
The prospects of using various wooden pipes in the processes of substance exchange
Authors: Naziralieva Nigora , Ikromova Yulduz , Khamdamov Anvar , Khudaiberdiev Absalom
Published: July 2024

This study introduces a novel approach to oil layering during the final distillation of vegetable oils using spherical wooden nozzles in the deodorizing champir. The nozzles, which move continuously due to the extraction of oil from the upper part of the device and the release of water vapor from the lower part, are shown to increase the contact surface between the liquid and vapor phases. This is demonstrated through the use of mulberry, walnut, and California nibs. The mobile floating wooden nozzles are found to enhance the interaction between the phases, leading to improved distillation outcomes.
Studies of methane inflow from longwall floor into the mine atmosphere
Authors: Kobylkin Alexander , Kubrin Sergey , Meshcheryakov Dmitry , Pozdeev Evgeny , Zakorshmennyi Iosif
Published: July 2024

The results of studies assessing methane inflow from longwall floor are presented. Based on mine observation data, the facts of an increase in local gas release from the carbon massif caused by an increase in the reservoir properties of rocks have been confirmed. A conclusion is made about the random nature of the spatial distribution of local sources of methane emissions in the lava. Measurements of methane content near a local gas source showed a decrease in its concentration with increasing measurement altitude. An assumption has been made about the connection between this reduction in gas pollution and the high speed of air movement near the soil. A fresh stream of air dilutes methane directly at the point of its release, and therefore, it is difficult to obtain data on the contribution of this source of methane inflow to the gas balance of the excavation site. The task has been set to assess the flow of methane from its local sources. A prototype of a device for measuring the flow of gas released from local sources is presented. The need for chemical analysis of samples of released gases is shown.
Conduite à tenir face à un chien ou un chat atteint ou suspect
d'être atteint par une maladie transmissible
Authors: Topie Emmanuel , Gogny Anne
Published: July 2024

La prise en charge des animaux contagieux, ou suspects de l’être, suit des procédures définies et écrites adaptées à la structure vétérinaire. La première barrière à l’introduction d’un germe contagieux dans une structure de soins est une application quotidienne stricte quel que soit l’animal des mesures d’hygiène de base, que ce soit pour l’hygiène des mains, des locaux, des surfaces et du matériel.

L’animal suspect ou confirmé contagieux est orienté dès son arrivé dans la structure, ou à défaut le plus tôt possible dès la détection du problème, vers le circuit pour animaux contagieux. La confirmation d’une infection par un agent infectieux transmissible est à effectuer le plus tôt possible. Une information claire, visible et précoce du personnel en charge de l’animal sur l’agent infectieux suspecté doit être donnée.

En cas d’identification tardive, après circulation dans les locaux, d’un animal contagieux, il est nécessaire de retracer son parcours (locaux, matériel, personnel, ...) afin de pouvoir mettre en place les mesures de nettoyage et de désinfection adaptées.

Que ce soit en consultation, en hospitalisation ou lors de la réalisation d’examens complémentaires, un isolement spatial ou temporel par rapport aux autres individus sensibles à la maladie concernée est nécessaire. Le personnel dédié aux soins est limité au strict nécessaire. L’utilisation d’un matériel jetable, ou à défaut facilement nettoyé et désinfecté, est préconisée.

La gestion des déchets et excrétas suit la même logique en évitant dans la mesure du possible la contamination de l’extérieur des contenants afin de ne pas disséminer l’agent pathogène lors du transport de ces déchets.
Comment nettoyer et désinfecter des locaux ayant accueilli des animaux contagieux
Authors: Fougeray Alexandra , Pouzot-Nevoret Céline
Published: July 2024

L’hygiène est capitale en milieu hospitalier vétérinaire afin de limiter le risque de transmission de maladies nosocomiales et de veiller au bien-être des animaux hospitalisés.

Les animaux contagieux ont des spécificités pathologiques qu’il est impératif de connaître et d’appréhender en pratique pour réduire le risque de transmission croisée.

La maîtrise de ce risque passe par le respect de méthodes strictes de nettoyage et de désinfection dans les locaux qui ont accueilli les animaux contagieux.

Au-delà de la notion de propreté, l’hygiène des locaux nécessite rigueur et bon sens. Les produits d’entretien, les détergents et les désinfectants sont choisis en fonction de l’agent pathogène suspecté ou avéré, et utilisés avec précaution en respectant les recommandations d’emploi.

Les critères de choix de ces produits sont essentiels. Ils doivent notamment bénéficier d’une efficacité maximale adaptée aux souillures à éliminer, d’une toxicité minimale pour les utilisateurs ou encore, ne pas être agressifs pour les supports traités.

Le conditionnement et le prix doivent aussi correspondre aux besoins de la clinique.

Le personnel soignant doit être formé et respecter les consignes pour la sécurité sanitaire de tous, employés et animaux.

Pour maximiser la désinfection des locaux ayant accueilli des contagieux, l’idéal est de réaliser un vide sanitaire après chaque fin d’hospitalisation.
Léiomyosite intestinale
chez un Bouledogue anglais de 4 ans
Authors: Cornet Thomas , Del Fabbro Nicolas
Published: July 2024

Une femelle Bulldog anglais stérilisée âgée de 4 ans est présentée pour des antécédents de vomissements intermittents, de diarrhée, de perte de poids et de pica évoluant en s’aggravant depuis 2 mois.

La chienne a subi une entérotomie iléale 2 semaines auparavant en raison d'une impaction de sable. L’analyse biochimique sérique et la formule sanguine complète, initialement normales, ont ensuite démontré un panhypoprotéinème sévère, une légère augmentation des paramètres hépatiques, une hyperbilirubinémie associée à une légère anémie discrète.

Des biopsies de pleine épaisseur obtenues 1 mois plus tard à partir de différentes coupes d’estomac et d’intestin grêle ont mis en évidence les caractéristiques histologiques de la léiomyosite intestinale. Une thérapie immunosuppressive est tentée, avec une rechute 1 mois plus tard et finalement la mort du chien.
Varizella Zoster
Authors: Ehrchen Jan , Hoy Matthias
Published: July 2024

Das Varizella-zoster-Virus (VZV) ist Erreger der Varizellen (Primärinfektion) und des Herpes zoster (Rezidiv). Die Erstinfektion erfolgt meist im Kindesalter über die respiratorische Route. Es kommt dabei zu einer systemischen Infektion mit dem VZV und an der Haut zu dem typischen VZV-Exanthem. Das VZV-Virus persistiert nach der Primärinfektion lebenslang in den sensorischen Spinalganglien. Im Laufe des Lebens kann es aus den Spinalganglien zu einer Reaktivierung des VZV kommen. Das VZV gelangt dabei entlang der sensorischen Nerven in das entsprechende Dermatom und verursacht in diesem den Herpes zoster. Zur Therapie stehen spezifische Virostatika zur Verfügung. Eine medikamentöse Therapie ist bei schweren Verläufen der Varizellen und bereits bei Risiko für schwere Verläufe des Herpes zoster angezeigt.
Informations- und Beratungsbedarf bei Elternschaftsentscheidungen:
Genügen bestehende Angebote und welche Rolle spielen
Depressionen?
Authors: Meyer Olivia Maria , Ehrenthal Johannes C. , Erbe Doris
Published: July 2024

Ziel der Studie Unterstützungsbedarf bei Elternschaftsentscheidungen und
der damit einhergehende Wunsch nach Informations- und Beratungsangeboten sind
insbesondere in Bezug auf Gruppen von Menschen mit psychischen Belastungen
unzureichend erforscht. Ziel der Studie war das Erfassen von Informations- und
Beratungsbedarf bei Elternschaftsentscheidungen. Zudem wurde untersucht, ob
stärkere depressive Symptomatik mit erhöhten Bedarfen einhergeht.

Methodik In einer Online-Studie wurde eine Stichprobe von 187 Personen
zwischen 20 und 44 Jahren erhoben.

Ergebnisse Nicht genügend Informationen zum Thema zu haben, äußerten 45%
der Teilnehmenden, der Informationswunsch bezog sich auf zahlreiche Themen. Ein
größeres Angebot professioneller Beratung wünschten sich 65% der Teilnehmenden,
74% wussten (eher) nicht, wo diese in Anspruch genommen werden kann. Bestehende
Beratungsangebote wurden in Relation zu den Bedarfen selten und bei überwiegend
mittelmäßiger Zufriedenheit genutzt. Eine stärkere depressive Symptomatik ging
nicht mit erhöhten Informations- oder Beratungsbedarfen einher.

Diskussion und Schlussfolgerung Die Ergebnisse legen einen Ausbau der
Unterstützungsangebote zu Elternschaftsentscheidungen nahe. Die weitere
Erforschung der Bedarfe verschiedener Gruppen und Hürden bei der Inanspruchnahme
bestehender Angebote ist hierzu maßgeblich.