bluuebunny/crossref_metadata_2025 huggingface dataset:
Pt single atoms dispersed in a hybrid MOFox-in-nanotube structure for efficient and long-term stable photocatalytic H2 generation
Authors: Qin Shanshan , Guo Junli , Chen Xuewen , Cao Ran , Denisov Nikita , Song Yan-Yan , Schmuki Patrik
Published: August 2023

Hierarchical structures produced by thermal conversion of MOFs within the anodic TiO2 nanotube layers combine the excellent light harvesting, carrier transport, and Pt SA anchoring to achieve a remarkable photocatalytic H2 evolution performance.
Modulating the microenvironment of AuPd nanoparticles using metal–organic frameworks for selective methane oxidation
Authors: Sui Jianfei , Gao Ming-Liang , Liu Chengyuan , Pan Yang , Meng Zheng , Yuan Daqiang , Jiang Hai-Long
Published: August 2023

The AuPd nanoparticles incorporated into Cu2+-doped MOFs selectively oxidize CH4 to CH3OH with H2O2 as an oxidant. The Cu species can alter the CH3OH selectivity by modulating the AuPd electronic state to improve CH4 adsorption and regulating the ˙OH formation.
A porous bentonite–coconut husk composite for the enhanced adsorption of selected emerging contaminants from aqueous solution
Authors: Egbedina Abisola O. , Odejobi Simisola B. , Akinbile Babatunde J. , Ambushe Abayneh A. , Olu-Owolabi Bamidele I. , Adebowale Kayode O.
Published: August 2023

Preparation of bentonite clay–coconut husk composite (BECH) via microwave-assisted carbonization, the activation of BECH with HCl (BECH-H) and KOH (BECH-K) and the adsorption of ciprofloxacin, tetracycline, and bisphenol A from aqueous solutions.
Single-residue mutation in protein kinase C toggles between cancer and neurodegeneration
Authors: Jones Alexander C. , Kornev Alexandr P. , Weng Jui-Hung , Manning Gerard , Taylor Susan S. , Newton Alexandra C.
Published: August 2023

Conventional protein kinase C (cPKC) isozymes tune the signaling output of cells, with loss-of-function somatic mutations associated with cancer and gain-of-function germline mutations identified in neurodegeneration. PKC with impaired autoinhibition is removed from the cell by quality-control mechanisms to prevent the accumulation of aberrantly active enzyme. Here, we examine how a highly conserved residue in the C1A domain of cPKC isozymes permits quality-control degradation when mutated to histidine in cancer (PKCβ-R42H) and blocks down-regulation when mutated to proline in the neurodegenerative disease spinocerebellar ataxia (PKCγ-R41P). Using FRET-based biosensors, we determined that mutation of R42 to any residue, including lysine, resulted in reduced autoinhibition as indicated by higher basal activity and faster agonist-induced plasma membrane translocation. R42 is predicted to form a stabilizing salt bridge with E655 in the C-tail and mutation of E655, but not neighboring E657, also reduced autoinhibition. Western blot analysis revealed that whereas R42H had reduced stability, the R42P mutant was stable and insensitive to activator-induced ubiquitination and down-regulation, an effect previously observed by deletion of the entire C1A domain. Molecular dynamics (MD) simulations and analysis of stable regions of the domain using local spatial pattern (LSP) alignment suggested that P42 interacts with Q66 to impair mobility and conformation of one of the ligand-binding loops. Additional mutation of Q66 to the smaller asparagine (R42P/Q66N), to remove conformational constraints, restored degradation sensitivity. Our results unveil how disease-associated mutations of the same residue in the C1A domain can toggle between gain- or loss-of-function of PKC.
Ways of adapting motor transport for the transportation of cargoes in low temperatures
Authors: Kucher A.V. , Krivutsa Z.F. , Shchitov S.V. , Kuznetsov E.E. , Samuilo V.V. , Evdokimov V.G.
Published: August 2023

The efficiency of motor transport is largely determined by regional natural and climatic conditions. The main direction of economic activity in Amur region is the production of agricultural products, and the important natural and climatic factors significantly affecting the operation of motor transport are the state of the traffic surface, terrain relief and ambient temperature. In winter, when transporting the finished products, the temperature drops to −35 ... −45 degrees Celsius in some areas, which also imposes certain difficulties in the operation of motor transport. In this regard, in order to improve the efficiency of power resources in these conditions it is necessary to further adapt them to the conditions of use. The proposed article considers the issue of increasing the efficiency of power resources when they are operated at low temperatures through the use of thermoelectric devices, allowing, through the use of secondary energy sources, to improve the performance of the hydraulic system and electrical equipment of a motor vehicle.
Methodology for analytical supply chain management in industrial production
Authors: Churakova E. Yu. , Arkhipova O. V.
Published: August 2023

The main purpose of this research is to develop scientific and methodological support for the supplier evaluation process to improve the supply chain management mechanisms for the manufacturing of components. The results of the research can be applied in any light and heavy industry, from medical equipment to aerospace applications. The problem is solved in a few simple steps which are described in the paper, namely: conducting an analysis of procurement legislation for current limitations and assumptions on nonfinancial requirements for suppliers, performing a parametric analysis of global supplier assessment practises, and developing an analytical method for evaluating suppliers with justification of distinguishing characteristics. In conclusion, some practical recommendations can be made.
Dynamics of development of cargo transportation in Uzbekistan
Authors: Mukhamedova Ziyoda , Ergasheva Zakhro , Ergasheva Vasilya , Abdullaev Rustam , Mukhamedova Dilbar
Published: August 2023

The structure of the economic development of railway transport in Uzbekistan is analyzed and evaluated in the article. An assessment of the dynamics of freight traffic development in Uzbekistan is given on the basis of GDP data. The volume of transport services provided and the use of modes of transport in terms of the volume of products shipped is considered. According to the dynamics of the growth of cargo transportation, a decrease in growth in 2020 was revealed due to the pandemic, but in general, there is a steady growth rate. Along with the ongoing operations on the renovation and reconstruction of railway tracks, it is necessary to take measures to optimize the entire chain of organizing cargo transportation through containerization, i.e. application of block train technology.
Study of the level of digitalization of logistics activities in small and medium-sized enterprises in the North-East Region
Authors: Demirova Siyka , Mehmedov Mehmed
Published: August 2023

The digitization of logistics activities in small and medium-sized enterprises is part of the changes brought about by the Fourth Industrial Revolution. Rapid technical progress in technology and its impact on production will put increasing pressure on both its structure and process distinctiveness. In addition to the positive aspects of this revolution, there are also negative ones, leading to a dramatic change in the functioning of individual units in any organization. In order to keep up with the changes, the company must demonstrate a capacity for digitization of its economic activity. This predetermines the purpose of the article, namely to examine the level of digitization of logistics activities in small and medium-sized enterprises in the North-East Region.
Optimization of maritime transportation based on marketing technologies
Authors: Voronina Elena
Published: August 2023

The paper deals with actual questions, related to development of maritime transport communications based on marketing approach. Usage of marketing tools (formation and adjustment of key expectations and needs for the target audience) enables more integrated approach to maritime transport operation and realization of it’s potential more systematically. The article presents expectations and needs of the key shipping route operators based on three-dimensional matrix (consumers-feature of needs- technology ‘know-how’ to cover needs), the most important factors development are analyzed with reference to local specific features to cover needs and preferences of shippers in highly competitive maritime transport market. On this basis, the author’s point of view on future perspectives of maritime transport communications development and it’s competitive growth is proposed. In order to attract operators’ attention to maritime route activities and fully involve it’s transport potential in economic turnover it’s necessary to create and develop of coastal infrastructure, the functioning of monitoring systems, and measures implementation to ensure navigation safety. The intensification of shipping and freight traffic growth will create effective maritime transport direction and stimulate business activity.
Evaluation possibility of the turbine disks using of converted aircraft engines of the NK family
Authors: Velikanov Peter , Velikanova Nina
Published: August 2023

The article examines the possibility of using converted aircraft engines for gas pumping units using the example of the main parts of the GTE - the disks of the NK-8-2U aircraft engine and the NK-16ST and NK-16-18ST ground engines. For all disks of the second stage of low-pressure turbines of three engines, the stress-strain state calculation was performed using the boundary integral equations method (BEM) and using the FEM in the Ansys program. For three disk stress concentrators, the theoretical stress concentration coefficient was determined and the maximum equivalent stresses were calculated. During long-term operation, the main parameters of engine operation change due to degradation changes (wear, erosion and corrosion, development of seals, contamination and resizing of flow parts). As a result, the main parameters of engine operation change, in particular, the rotation speed of the rotors and the gas temperature in the turbine, which determine the stress-strain state, which must be taken into account when predicting durability. The compliance of the results of the calculated study of the stress-strain state of turbine disks with their real load was confirmed by the data of their metallurgical study after prolonged operation. Using the Manson formula for the disks of three engines, their cyclic durability was determined before the formation of a crack of low-cycle fatigue. Using the linear damage summation hypothesis, the total damage rates (under static loading and under fatigue loading) for the disks of three engines were calculated. It is established that after the conversion of aircraft engines that have spent their life in flight operation, it is advisable to continue the use of turbine disks on ground-based GTU.
Application of machine learning in the classification of traffic in telecommunication networks: working with network modeling systems
Authors: Uymin Anton
Published: August 2023

The issues of classification of online traffic in the framework of the work of network infrastructure modeling systems are considered. The main classifiers C4.5 Decision Tree, Random forest Method, SVM, KNN are considered. The parameters responsible for the speed of the platform are substantiated. The 8CoS model is described. The parameters Accuracy, Sensitivity, Specificity are defined. As part of load testing, a method with the least load on the computing power of the platform, C4.5, was identified. The parameters of the model building time and the general processing time for the case with the number of classification instances up to 2000 are determined. The points at which the C4.5 model gives advantages are identified. Each method was evaluated in terms of classification accuracy and processing time. C4.5 achieved a high percentage of accuracy - 98% with a CPU load of 23.
Investigation of the motion parameters of technological complexes using a quaternion data fixation apparatus
Authors: Us Semyon , Kuznetsov Evgeny , Shitov Sergey , Burmaga Andrey , Marshanin Evgeny , Belyakov Dmitry
Published: August 2023

Despite a fairly large range of methods known in the existing branches of technology and used in the industry for detecting possible failures and malfunctions, it is still relevant to study the possibilities of using modern digital tools and instruments that are capable of carrying out in-place diagnostics or fixing workers at a sufficient level of reliability with a minimum research time. Parameters of systems and elements of such a complex restored object as a technological complex used in agriculture. The article substantiates the use of a high-precision inclinometric complex for in-place diagnostics of a technological complex and presents the results of an experimental study of a machine-tractor unit.
SolidWorks flow simulation software potential in hydrodynamic processes analysis for cone vortex emulsion
Authors: Fialkova Evgenia , Baronov Vladimir , Slobodin Aleksandr , Nechaev Konstantin
Published: August 2023

The purpose of this work is to compare the hydrodynamic data of the real flow simulated by SolidWorks Flow Simulation in an emulsor of vortex type. The object of the study is an emulsion, in the central part of the energy separation chamber of which a zone of low pressure, the cavitation zone, is created. In this zone the dispersion phase collapses. Computer simulation of fluid dynamics of the emulsification process has been suggested to optimise the design of this type of emulsor. To check adequacy of results of modelling and real process, visualization and comparative evaluation of shape of flows at pressure of liquid at the inlet 0.4 MPa and its kinematic viscosity 10−6 m2/s. The use of SolidWorks Flow Simulation software has been found to give a fairly close-to-reality overall flow pattern. When considering the calculated flow from the position of fluid displacement and comparing it with experimental data, a good match is seen in the shape of near-axis flows. Three vortex zones are clearly visible in the model. In the real flow there are similar vortex zones which, although not clearly visible, are visualised by photography. With the software, the overall flow pattern is fairly close to reality. However, it is not possible to conclude that the velocities of the calculated and real flows coincide. By considering the various design changes in the simulation and evaluating their effect on the hydro and thermodynamics of the process, some regularities can be identified and used in the design of new designs, i.e., the results of computer simulation can be a good guide in the design of new devices.
Modeling and assessment of the energy state of the technological system of mechanical processing when creating digital twins
Authors: Sulyukova L.F. , Yakubjanova D.K. , Djumaev S.N.
Published: August 2023

An approach to the construction of digital twins of the technological system for turning low rigidity parts and the assessment of the energy state of the technological system is proposed in this article. The creating of the digital twin models by differential equations allows to excide a time-consuming procedure for training neural networks. The results obtained are transmitted to the energy state assessment block. Calculations are performed to determine the power consumption between the moving parts of the machine and the cutting process. To determine the energy, we use the Hamilton equations. The developed modeling technique and the results of computational experiments will provide an operational and resource-saving mode of production in the machining process.
Development and research of a model of a microprocessor device of a set-up control unit for paired points
Authors: Azizov Asadulla
Published: August 2023

The use of electromagnetic relays in railway control systems is very problematic. The solution to this problem is based on process modelling and the use of microelectronic devices. The functional scheme for different modes of operation of twin switches control unit has been developed and investigated. Algorithms and functional scheme of microelectronic unit are given.
Theoretical and experimental investigation of cavitation number limits
Authors: Kuimov Denis
Published: August 2023

Cavitation remains a popular field of scientific research due to the generated effects and a wide range of possible applications. At the same time, despite the active development of technologies for treatment of liquid materials by cavitation action, the equipment used for initiation of cavitation action has not fundamentally changed. In this regard, the main direction of development of efficiency of technological processes based on cavitation impact should be the search for ways to improve the efficiency of existing equipment, which will form the basis for the development of new types of devices. For development of devices it is necessary to understand how to increase the efficiency of created cavitation in various devices. To date, in the analysis of the degree of intensity and the threshold of creation of cavitation is used dimensionless cavitation number, which due to a number of limitations is not able to fully reflect all the parameters of the process of creation of hydrodynamic cavitation. In this paper we present a theoretical and experimental study using two types of hydrodynamic cavitation generators, to assess the limitations of the dimensionless cavitation number.
Internet platform for analyzing computer memory of Windows operating systems for conducting information security investigations
Authors: Tretyak Michael , Cherckesova Larisa , Korochentsev Denis , Revyakina Elena , Popov Alexey
Published: August 2023

Within the framework of this article, an analysis of the dynamics of the growth of information security incidents identified in companies by specialists of the department of monitoring and responding to information security threats was carried out. The study examined the problems faced by information security specialists in companies, and what tools they use to perform their tasks. Countering cyberattacks requires timely response to a recorded incident and accuracy in its investigation. As part of this scientific work, an automated digital platform was developed for analyzing RAM dumps of Windows operating systems for conducting investigations in the field of information security. This tool will provide a digital forensics specialist with additional time to investigate information security incidents by minimizing routine tasks and a centralized information processing location.
On the geometry of Liouville foliations
Authors: Narmanov Abdigappar , Ergashova Shohida
Published: August 2023

The paper studies the geometry of Liouville foliation generated by integrable Hamiltonian system. It is shown that regular leaves are two-dimensional surface of zero Gaussian curvature and zero Gaussian torsion.
Architecture of new technological worlds on the example of IT-parks
Authors: Malysheva Evgenia , Adonina Anna
Published: August 2023

The article considers IT-parks as examples of the implementation of new technological worlds of the information post-COVID period on the example of large international and domestic IT companies. Modern trends and general principles of creating office spaces for IT organizations are revealed from the point of view of the influence of the environment on the physical, psychological and emotional well-being of employees. The study identified seven main trends: a healthy work environment, biophilic design, transformable spaces, hybrid workplaces, sustainable workplaces, contactless technologies, a unique interior that tells the story of the company. These trends were further implemented in the design: in the experimental graduation project of the IT-park in Samara and in the implemented building of the IT-park in Samara.
Assessment of the reliability of the information system for identifying mobile devices by IMEI code
Authors: Isroilov Jamshid , Davronbekov Dilmurod , Khakimov Zafar , Abdullaev Murod , Turaxodjaev Najmiddin
Published: August 2023

This paper evaluates the reliability of the information system for identifying mobile devices by the IMEI code (International Mobile Equipment Identifier). A system for identifying mobile devices by IMEI code is presented, which includes a database that is accessible both locally and remotely. The system allows collecting, storing, and processing information about all devices imported into the country and used in the country. Indicators for calculating the reliability of the information system are selected. Only server hardware with software is considered, and communication lines or other devices connected to the server are not considered. The situation is considered when the database of IMEI-codes and the software part are located on the same equipment, additional redundancy or duplication of nodes, elements, modules are not provided. A method for calculating the reliability of the “server - software” complex is proposed and analytical expressions for calculating the reliability are developed. The obtained results indicate good reliability and fault tolerance of the developed information system.
Digital divide model: applicability, benefits, prospects
Authors: Tikhanychev Oleg
Published: August 2023

One of the aspects of the society development is the continuous improvement of the model of relations between a person (citizen) and society (state). As historical experience shows, often this model was a factor in the successful development of the state. There are three main types of relationship models: those determined by the priority of the state over the person, determined by the importance of human values, based on solidarity and subsidiary relations. There is a common drawback in the application of all these models – they are the same for all citizens within the borders of one state. With this in mind, the subject of the study is the structure of the relationship model “person-state”. Historical analysis and synthesis are chosen as research methods. Based on the analysis, it was determined that the maximum possible differences in the application of existing models are realized through the division of citizens into groups according to age, gender or other formal characteristics. It is concluded that such a situation can lead to internal conflicts, but so far it could not be corrected due to the lack of appropriate segregation mechanisms. The paper formulates the task of creating a new model of relations based on the digital divide in terms of the parameters chosen by each individual. It is concluded that the implementation of the proposed model will have a practical effect, which is to increase the efficiency of the functioning of the system of state and municipal government, while the technical prerequisites for the creation and implementation of such a system of relations already exist.
A Survey on Internet of things architectures
Authors: Boboyeva Zulfiya , Sokhibov Rakhmonali , Yuldashev Ibrohim , Ma’murov Abdusalom
Published: August 2023

Physical items grow wiser, everyday operations become cognitive, and system for improving becomes educational via the Internet of Thing. Even though the World Wide Web is still developing, it has already made remarkable achievements as a global media alternative for the linked world. The development of adjacent fields does not usually begin with a study of architectural specifically. The academics are now unable to navigate the range of Internet of Things-centered techniques because of their lack of general structural understanding. In order to truly comprehend relevant tool, software, and technique and to support client needs, this literature and studies World Wide Web of Stuff designs. The given designs either explicitly or indirectly suggest developing and implementing potent Network of Things concepts to address real-world issues. In order to encourage academia and industry to look for potential solutions to harness the full capability of the Internet interconnected Things, research gaps have also been examined to accommodate the gaps in the present architectural trends. This surveying paper’s central aspect is its comprehensive summary of the government in Internet of Things designs across multiple disciplines.
Information system for data analysis of electronic operational documentation to support the development of economic processes
Authors: Litvinov Vladimir , Vladimirov Roman , Naumov Petr , Fedoseev Stanislav , Ushakov Dmitry
Published: August 2023

The article presents an information system for data analysis of electronic operational documentation, the main purpose of which is the storage, collection and analysis of information, as well as the formation of an expert decision and forecasting to improve the quality of user work and the speed of processing large amounts of information. The functional structure of maintaining operational documentation was considered, a description of data flows and business processes was carried out, and the interaction of decision support systems with the subject area was studied.
The carsharing market in Russia: Factors of formation and development trends
Authors: Kireeva N.S.
Published: August 2023

The paper identifies the factors that have influenced the development of the carsharing market in Russia, analyses current trends and identifies the problems hindering the development of the service. As the research shows, the carsharing market developed at a fast pace in 2015-2021, not counting the pause in the first half of 2020 caused by the coronavirus epidemic. This was facilitated by the benefits that carsharing offers to users, as well as government support for carsharing services. It is revealed that users’ interest in this service grew from 2015 to 2019, then the trend changed to a negative one. Analysis of internet users’ search queries reveals that their awareness about carsharing has increased by 2022 as compared to 2019. In 2022, the market for carsharing services saw dramatic changes due to the departure of a number of foreign car manufacturers and difficulties with the supply of spare parts. It is concluded that the carsharing market has a high degree of monopolisation. The most significant factors limiting the development of carsharing include the rapid growth of tariffs, difficulties in renting a car within walking distance, user concerns about possible damage to the car, technical failures, leakage of personal data, and a lower sense of privacy, security and comfort compared to a private car. The elimination of the identified negative factors (curbing fare increases, state support of carsharing companies in the regions, improved accessibility of carsharing, etc.) will contribute to a more rapid development of this service.
Modern trends in the design of leaf spring suspensions of trucks
Authors: Dmitriev Pavel , Makarov Vladimir , Manianin Sergey , Klyushkin Anton , Belyaev Alexander , Papunin Alexey
Published: August 2023

The article provides an analysis of the improvement of methods for calculating of leaf spring suspensions in retrospect; features of modern calculation methods and own experience in developing of a spring suspension design for a medium-tonnage truck with a gross weight of 6 tons.
Study of the kinematic characteristics of the motion of the car from the top to the design point
Authors: Djabbarov Shukhrat , Saidivaliev Shukhrat , Abdullayev Bakhrom , Gayipov Aziz , Rakhmatov Khamza , Soboleva Irina
Published: August 2023

Objective: to describe the speed of the car at each section of the descent part of the hump using the principles of classical mechanics; to get a generalized model of the speed of movement of the car at the estimated point of the hump, which allows speeding up the process of building graphs and changing the kinematic characteristics of the car’s movement; to present the change in the instantaneous speed of movement of the car along the entire length of the descent part of the hump in the form of a graph of the step function. The resulting model allows quickly analyzing the mode of shunting cars from the humps, the combination of power of brake positions and improve the accuracy of determining the permissible velocity of impact of cars in the sorting yards. This paper is the most important step for solving a promising task of designing an automated system for calculating the dynamic characteristics of a car in a hump yard.
Evaluation of energy efficiency of promising fuels for autotractor reciprocating engines
Authors: Karimkhodzhaev N. , Saydaliev I. N.
Published: August 2023

The prospects for the use and reserves of petroleum fuel resources pose the problem of finding alternative fuel from non-oil sources for automotive and tractor engines. There is a problem of determining the most efficient type and source of production of such fuels. To do this, it is necessary to assess the energy efficiency of the systems for the production and use of fuel from the moment it is in the form of raw materials until it is converted into mechanical work. Such an approach to solving the problem makes it possible to evaluate all types of potential fuels, their main sources, as well as to evaluate the effectiveness of their use in automotive and tractor engines in a fuel-engine combination.
Study of the parameters for a parallel hybrid electric vehicle
Authors: Ni Lin Zar , Sidorov V.
Published: August 2023

At present, the expansion in vehicle population has contributed to the increase in carbon emissions and has led to an even greater increase in the need for fuel. In this way, the hybrid vehicle (HEV) and the electric vehicle (EV) are being introduced to reduce fuel consumption and exhaust gas emission instead of conventional vehicles. The study of parameters for the hybrid electric vehicle is important to design the powertrain of the vehicle. The parameters of hybrid vehicles consist of the rate of internal combustion engine (ICE) power, transmission gear ratios, motor maximum torque and power, capacity and power of battery. The vehicle model with the regenerative model is built to calculate the regenerative energy for driving on a road condition. The design purposes to match the vehicle with the specified performances, like as speed and acceleration. Many parameters are chosen from analysis of this results. And then, as a result, fuel consumption of test vehicle model reduces 15% than the conventional vehicle in this study.
Optimal distribution network reconfiguration to minimization power loss
Authors: Khasanov Mansur , Kamel Salah , Abdubannaev Jasur , Nazarov Furqat , Kurbanov Abror , Jalilov Urinboy
Published: August 2023

With the development of industry, population growth, and suburbanization, load demand is constantly increasing from year to year. Overload demand has greatly strained the distribution network (DN), resulting in increased power losses due to the high-power flow. Therefore, it becomes very important to minimize power losses at the DN to maximize the efficiency of the distribution companies. Network reconfiguration is one of the effective methods distribution companies use to minimize losses in the DN. This paper proposes Dingo Optimization Algorithm (DOA) to solve network reconfiguration problems and minimize the DN's power loss. DOA mimics the social behavior of the Australian dingo dog. IEEE-33 bus DN has been used to demonstrate the effectiveness of the proposed method. The obtained simulation results compared with other methods in the literature and comparison showed that the proposed DOA provides better quality solutions than other methods.
Sea surface short-period roughness unsteadiness
Authors: Shumeyko Irina , Burdyugov Vyacheslav
Published: August 2023

The effect of spatial inhomogeneity of sea waves on the accuracy of determining the level of the sea surface is studied. Based on the data of direct wave measurements, the variability of statistical characteristics of sea waves on scales smaller than the size of the area illuminated by the radar was analyzed. The case is considered when radio sounding is carried out at low angles of incidence by radar located on a spacecraft. It is shown that the displacement of the distribution median of surface elevations, which determines the skewness bias, is alternating. The absolute value of the median shift reaches two percent of the significant wave height. In most cases, the signs of skewness bias and electromagnetic bias coincide.
Efficiency of using hydro-turbine pumping stations for machine irrigation
Authors: Tsurikova Elena , Sharkova Marina
Published: August 2023

The use of hydro-turbine pumps increases the efficiency of pumping stations for machine irrigation by utilizing the free water energy of agricultural irrigation sources. The energy savings on irrigation pumping stations achieved through the use of hydro-turbine pumping stations (HTPS) (traditionally obtained through electrical networks) creates ecological conditions for the implementation of turbine pumps, while also improving the economic efficiency of pumping stations.
Methods for economic assessment of operational quality and its impact on railway delivery time
Authors: Shkurina Lidia , Maskaeva Shkurina
Published: August 2023

Transport is as important to the consumer of products as the production process, so the building of cost-effective options for freight delivery is a pressing economic challenge. Rail transport occupies a significant share of the transport market, the importance and efficiency of which increase when transporting a large flow of goods over long distances. Solving an important task of railway transport - full and timely satisfaction of the country𠄉s economy needs in transportation, requires providing further improvement of economic methods of analysis and planning of operational work. Effective management of operational work in freight transportation enables one to manage freight flows in an optimal way and to provide additional volumes of transportation by means of released resources. In this case, the implementation of measures aimed at increasing the speed of vehicles and, as a consequence, reducing the time to the delivery of the cargo is of great importance. As analysis has shown, the largest volume of penalties paid to customers for breach of contractual obligations are payments for failure to meet deadlines for cargo delivery. The results of analytical studies made it possible to identify systemic violations in the quality of the transportation process and to form measures to improve the quality of transport services to customers.
Ensuring the safety of rolling stock movement when entering transition curves
Authors: Martynenko L.V.
Published: August 2023

The main factor in the issue of the safety of the rolling stock movement in the rail track is the change in the magnitude of the lateral forces arising from the interaction of the wheel with the rail. The dynamics of changes in lateral forces directly depends on the increase in rolling stock speeds in curves and, especially, in transition curves. To prevent the sudden appearance of centrifugal force, the outer rail is elevated, the track is broadened when moving from a straight line to a circular curve and a transition curve of variable curvature r = l / p, where p is the variable radius of the curve. Within the transition curve, the current elevation h of the outer rail over the inner rail must be proportional to the current curvature value, including at the end of the transition curve, all these factors leading to a sharp dynamic increase in lateral forces. In this case, the elevation h0 of the rail and the curvature r0 = 1/R are the parameters of the circular curve. Due to the fact that r, h and track width S are variables within the transition curve, in case the widening in a circular curve is intended when moving along the transition curve, additional forces and moments arise not present either on a straight line or on a circular curve. It is necessary for any additional force factors (forces and moments) to change gradually and be equal to zero at the beginning (BTC) and end (ETC) of the transition curve, and for the absolute values and intensities (gradients) of their changes within the transition curve not to exceed the allowable values, which is provided by complying with the requirements specified in table.1.
Proportion calculation of the defect parts in track switching equipment
Authors: Shishkina Irina
Published: August 2023

This paper presents a direct calculation of the average value of defective elements of point products. Production process control is considered using the example of the control of point products. The calculation of the first four moments in a binomial distribution of the number of defective elements of point products is made. The standard error of the fraction of defective elements is considered in detail.
Refinement of thermal engineering calculations results taking into account actual materials characteristics
Authors: Kuzmenkov Alexander , Karachentseva Iana
Published: August 2023

The article presents the laboratory studies results of building materials thermophysical characteristics used in the construction of experimental wooden buildings. In the framework of laboratory experiments, the thermal conductivity and humidity of structural and thermal insulation materials samples were evaluated. The analysis and comparison of the results obtained with the characteristics of the materials declared by the manufacturers and in the reference data is carried out. The results of thermal engineering calculation refinement of the of the enclosing structures of experimental wooden buildings, taking into account the results of laboratory studies of the thermophysical characteristics of building materials used in construction, are presented. The thermal engineering calculation of the enclosing structures of the frame part of experimental buildings has been refined taking into account the actual thermal conductivity of building materials. The influence of the actual thermophysical characteristics of building materials on the results of thermal engineering calculation in comparison with the design values was evaluated. Further directions of research are presented in terms of the influence of cold bridges and inhomogeneities of structures on the thermal characteristics of the thermal contour of the building.
Investigation of natural vibrations of thin-walled structures interacting with fluid
Authors: Khudainazarov Sherzod , Mavlanov Tulkin , Sabirjanov Talibjan , Donayev Burkhon
Published: August 2023

The problem of studying the dynamics of elements of hydro-technical structures interacting with fluid is considered in the article. On the basis of Lagrange’s variational principles, the basic equations are obtained that characterize the dynamics of complex, multiply connected structurally non-homogeneous shell systems interacting with flowing fluid. Dynamic equations of a cylindrical shell are obtained. To determine the fluid pressure on the shell surface, a boundary value problem based on the laws of hydroelasticity was used. A software package was developed for studying the dynamic characteristics of complex, multiply connected structurally non-homogeneous shell structures, as well as programs for studying the dynamic characteristics of a composite structure using the orthogonal sweep method. Dynamic characteristics are determined for different levels of water filling.
A new method for calculating volumetric structural elements in the general case of their stress-strain state
Authors: Novoselov Oleg , Sabitov Linar , Sibgatullin Kamil , Sibgatullin Emer , Chepurnenko Anton
Published: August 2023

The parametric equations of the strength surface in the space of internal force factors (IFF) are given for 9 forces and 9 moments in homogeneous anisotropic bodies. As special cases, similar equations are given for isotropic bodies that resist tension and compression differently (and equally). A variant of the kinematic method of the theory of limit equilibrium is proposed. A rigid-plastic model of a deformable solid body is used. It is assumed that massive structural elements are destroyed by dividing into parts that deform relatively little (“absolutely rigid finite elements”, ARFE) and have 6 degrees of freedom in three-dimensional space. The process of destruction of the material goes along infinitely thin generalized destruction surfaces (GDS), on which the work of all active IFFs is taken into account. To determine the minimum kinematically possible load, the simplex linear programming (LP) method was used.
Energetically optimal dimensions of parallelepiped-shaped industrial structures
Authors: Galkin A.F. , Pankov V.Yu.
Published: August 2023

Technical structures with a parallelepiped form are frequently used in various areas of industry. For example, as fluid containers, ice and minerals piles, underground and surface storages and cooling chambers. A task of determining the optimum dimensions of the structure to minimize the energy expenses to support a normative temperature in the structure arises. The minimum surface area of the structure at a given volume is accepted as a criterion of optimality. A problem of unconstrained optimization for a structure with a parallelepiped form was formulated and solved. Equations to determine the optimum dimensions of width, height and length of the structure were obtained. It was determined that a cube is the most optimal form.
Seismic resistance evaluation of multi-story buildings using the modern LIRA-SAPR SP
Authors: Salyamova K.D. , Yuvmitov A.S. , Shamsiev D.K. , Ayubov G.T. , Numonov A. , Khazratkulov I.
Published: August 2023

This article presents the results of evaluating the seismic resistance of high-rise buildings on real records of the accelogram and on regulatory documents using the LIRA-SAPR SP. The maximum and minimum values of bending moments, longitudinal forces, shear stresses are determined, and the most vulnerable areas where cracking in load-bearing structures is possible are determined. It was found that the values of force factors arising in buildings under the action of the accelogram turned out to be 2 times less than the values obtained from the data based on regulatory documents. Along with this, it was found that the results of the calculation for the seismic resistance of high-rise buildings according to real accelerograms and according to regulatory documents showed that the higher the building, the greater the magnitude of displacements, bending moments and longitudinal forces on the upper floors of buildings. This requires the development of appropriate measures to reduce the vibrations of the upper floors of multi-story buildings.
Simulation of the structure of a multistory building with seismic isolation and the testing technique on a laboratory bench under dynamic ((seismic) impacts)
Authors: Sagdiev Kh.S. , Yuvmitov A.S. , Egamberdiev B.O. , Toshpulatov S.U. , Toshmatov E.S.
Published: August 2023

The article presents the main provisions of modeling multi-story buildings with seismic isolation, the characteristics of the seismic isolation device, structural elements and materials, the methodology for conducting experimental studies on a laboratory vibro-stand under dynamic (seismic) effects and the results of the modeling.
Theoretical and methodological foundations of ensuring financial and economic stability of enterprises
Authors: Kadirov Abdumalik
Published: August 2023

This article describes how to ensure the economic sustainability of the industrial enterprises of Uzbekistan. Also, scientists analyzed the approaches of economists estimation of economic and mathematical methods of «sustainability» and «economic sustainability» and their studies. On the basis of these data, the author proposed a system of evaluation of the economic sustainability in industrial enterprises. Description of the comparative evolution of the industrial enterprises of statistical and dynamic methods in economic sustainability.
Analysis of financing mechanisms for the digital transformation in construction sector
Authors: Ablyazov Timur , Shirshikov Sergey , Petrov Ivan
Published: August 2023

Digital transformation of the construction sector is one of the key tasks in the development of the digital economy both in Russia and abroad. However, at present, the digital transformation of the construction sector is carried out at an insufficient pace due to the lack of an effective mechanism for financing this process in construction. In this article, we have collected and analysed data on financing mechanisms for digital transformation projects in the construction sector in the European Union, China, India, UAE, as well as in Russia. As a result of this study, we substantiate the relevance of improving the mechanisms to finance digital transformation projects in the construction sector and substantiate the dependence of the pace of digital transformation in the construction sector on the level of development of the mechanism for financing the digital transformation process.
The concept of implementing lean manufacturing technologies in transportation enterprises
Authors: Kotsyuba Igor , Shikov Alexey , Puntikov Arseniy
Published: August 2023

The article explores the techniques and tools of lean manufacturing, and formulates the concept of implementing lean approaches in transportation enterprises. Lean manufacturing technologies are necessary for the transportation industry, and their application is already in progress in many companies with varying speed and effectiveness. To achieve this, firstly, existing practices in implementing lean manufacturing technologies in transportation enterprises are analysed, secondly, the organisation of flow of individual transportation and logistics operations is identified as the fundamental basis for a lean transformation, and thirdly, a possible approach to revising the overall organisation of transportation enterprises is proposed to realise a continuous flow through the transition to network-centric logistics. The scientific novelty of the study is that it presents and analyses the problem of contrasting partial and systematic implementation of one of the most promising management methodologies, and identifies a direction for formulating specific recommendations for transportation enterprises. The main idea of the concept is that transportation enterprises are encouraged to focus on the flow of information rather than material.
Significance of Jadid Obidjon Mahmudov’s activity as a deputy chairman of the Kokand city Duma and minister of Turkestan’s autonomy
Authors: Komilov N. B.
Published: August 2023

The article describes the great reforms carried out by Jadid Obidjon Mahmudov for the development of our country and people, as well as new aspects of the scientist’s activity as Deputy Chairman of the Kokand City Duma and Minister of Food of the Turkestan Autonomy.