bluuebunny/crossref_metadata_2025 huggingface dataset:
Gas production behaviour of gas hydrate–bearing clayey-sand during depressurization: novel in-flight centrifuge modelling
Authors: Baghbanrezvan Sina , Ng Charles wang wai
Published: April 2023

Gas hydrate-bearing sediments (GHBS) are vastly distributed around the globe. While gas production attempts are made through GHBS, long-term production remains a challenge due to complex inter-related mechanisms involved. Better understating of long-term responses requires sound physical modelling conducted under controlled conditions. A novel centrifuge energy harvesting chamber (CEHC) at the HKUST centrifuge facility is used in this study. This is the first chamber that can operate at elevated gravities with the capability of sustaining the thermodynamically favourable conditions for gas hydrate formation, sustaining a continuous inflow of high-pressure water at the boundaries during dissociation, and an in-flight control of wellbore pressure and surcharge loading. Centrifuge modelling can recreate the insitu stress gradient in a relatively small model and expedite conduction and convection processes involved during dissociation. Consequently, long-term in-situ mechanisms can be evaluated with a small model and short time. A test was conducted at 40g to evaluate the temperature-pressure response as well as gas production behaviour of hydrate-bearing clayey-sand during depressurization. The results suggests that the gas flow rate is governed by the initial available latent heat as well as the conduction and convection heat through the surrounding sediments. However, as the depressurization progresses, the gas production rate is governed by the competing effects of hydrate dissociation and re-formation which both evolves the permeability of the sediment. Details of the experiment and test results are reported in this paper.
On the resistance of hydrophobic soil polymer coatings created by cold plasma polymerization
Authors: Magalhães Toffoli Clara , Milatz Marius , Grabe Jürgen
Published: April 2023

Hydrophobic soils have natural or artificial origin. In this context, some techniques exist to turn into hydrophobic sand that was originally hydrophilic, as most soils in fact are. Its classical application is impermeabilizing structures where water percolation is not desired. In this paper, a new technique to achieve hydrophobicity is described. It consists of coating particles via cold plasma. The process is known to the industry, but its application in geotechnics is not yet described in literature. The monomers used were octafluorcyclobutane (C4F8) and 1H,1H,2H,2H-perfluoroctylacrilate (PFA-C6). For each monomer, the material was in the coating chamber during two different time spans and a sample was pretreated with oxygen. Different mechanical, thermal and hydraulic conditions were imposed to the samples in order to evaluate the resistance of the coating and its properties. The hydrophobicity was evaluated by means of Water Drop Penetration Time. Results indicate that longer time spans in the cold plasma chamber lead to a more hydrophobic material and that oxygen pretreatment on the sample is irrelevant. It was also observed that mechanical, hydraulic and thermal procedures influence the coating. These observations lead to optimization of the production process and to the understanding of how the material can be applied in the construction industry and what mechanical/hydraulic loads it can be subjected to.
Influence of permeability on rainfall infiltration based on water gas two phase flow
Authors: Tian Wenjing , Peiffer Herman , Malengier Benny
Published: April 2023

The permeability function is one of the key properties in unsaturated soil mechanics and variation of parameters in soil water characteristic curve can easily affect matric suction as well as infiltration. The purpose of this research is to explore the significant effect of parameters in SWCC on rainfall infiltration. A water gas two phase flow analysis method was conducted to investigate the influence of parameters in SWCC on stable infiltration intensity. Result showed that when saturation was low, stable intensity of infiltration was greatly affected by matric suction because the modified parameters were related to pore size distribution such as air entry value ρ0 and parameter m. When saturation was close to 1, the influence of soil infiltration intensity was almost not affected by matric suction. The minimum value of stable infiltration of intensity was mainly determined by the intrinsic permeability, while saturation of this value was mainly affected by soil water characteristic curve, intrinsic permeability coefficient of soil as well as water relative permeability coefficient.
Composite Barrier Systems for Climate Adaptation
Authors: Holmes Jessica L. , Stirling Ross , Davie Colin T. , Thaman Narryn , Glendinning Stephanie
Published: April 2023

Composite barrier systems, which are two-layer systems of materials (fine-grained material overlying coarse-grained material) of contrasting hydraulic properties, can be used to mitigate the effects of climate change in urban areas, including flooding and shrink swell deformation. Here, a series of experiments were carried out to test a range of materials, including 20-30 mm gravel, recycled crushed concrete, topsoil, and topsoil amended with water treatment residual (WTR). The consideration of waste products here aims to improve the sustainability of composite barrier systems for climate adaptation. The results indicate that WTR-amended topsoil is suitable for use as a fine-grained material in composite barrier systems owing to its enhanced water retention properties. However, while crushed concrete can be used in the coarse-grained layer to form a capillary barrier when the system is dry, once breakthrough has occurred, transmission of water through the barrier is quicker than in composite barriers with 20-30 mm gravel. As such, 20-30 mm gravel is recommended for use in the coarse-grained layer. Two large-scale, outdoor lysimeters were set-up using the recommendations derived from the column experiments. The lysimeter experiments were subjected to a series of simulated rainfall events to enable initial interpretations of composite barrier performance.
Climate-driven soil suction variation using a natural-order Fourier series approach
Authors: Olaiz Austin , Zapata Claudia
Published: April 2023

In unsaturated soil practice, the near-ground-surface moisture flow is commonly evaluated using the 1-dimensional (1D) suction diffusion equation. This study presents the application of a Natural-Order Fourier Series (NOFS) approach for representing monthly climate-driven soil suction variations near the ground surface, which is a boundary condition that is generally difficult to adequately model. The NOFS incorporates an algorithmic selection criterion to optimize the order of the Fourier series to improve the capture of the seasonal shifts and extreme climate periods, while maintaining acceptable computation efficiency. The climate-soil suction interaction is expressed using published empirical relationships between monthly rainfall, temperature, and soil index properties. An example and validation study of the proposed NOFS selection approach is presented using measured soil properties and historical weather data at a study site in Denver, Colorado USA. Key findings from performance and stability studies of five locations in the United States associated with differing climate regions are discussed. Limitations and recommendations for implementation are also included. The proposed NOFS approach for capturing climate-driven changes in suction near the ground surface can be efficiently implemented in unsaturated soil numerical analyses that are governed by moisture-dependent mechanical soil behavior and can help improve the computation time, stability, and performance associated with stochastic simulations.
Calibration of a granular matrix sensor for suction measurements in partially saturated pyroclastic soil
Authors: Tartaglia Marialaura , Pirone Marianna , Urciuoli Gianfranco
Published: April 2023

Field monitoring of soil moisture and matrix suction is a useful tool for the implementation of a reliable early warning system against rainfall-induced landslide occurrence. Several test fields have been set up in Campania region (southern Italy), frequently affected by flow-like landslides involving pyroclastic soil cover. In particular, at the Mount Faito test site (Lattari Mountains, southeast of Naples), field matric suctions were measured over two years by conventional jet-fill tensiometers and granular matrix sensors (Watermark, Irrometer®) at different depths. Granular matrix sensor is a resistive device that is more and more spread in agriculture applications and that may also be used for geotechnical purposes thanks to a suitable calibration. In order to gain the calibration curve of the Watermark sensor, two small tip tensiometers (STT) and one High Capacity Tensiometer (HCT) were installed at the same depth of the Watermark sensor in the partially saturated pyroclastic soil sampled at the topsoil of the Mount Faito test site. Tests were carried out in the laboratory by performing drying and wetting phases on undisturbed soil sample. By coupling resistance measurements by Watermark and matrix suction provided by the reference tensiometers, it was possible to derive the non-linear relationship between these two quantities. The soil retention curve was also determined thanks to the installation in the soil sample of a decagon probe previously calibrated in the same pyroclastic soil.
A prototype for water content measurement in partially saturated soils
Authors: Guglielmi Simona , Pirone Marianna , Amatucci Nicola , Cesaro Umberto , D’Arco Mauro , Urciuoli Gianfranco
Published: April 2023

The paper presents the technological set-up and calibration of a system based on impedance spectroscopy for measuring water content in partially saturated soils. The technique adopted is relatively recent in geotechnical practice; it is used herein to characterize the electrical response of a soil specimen among two conducting electrodes upon application of an alternate voltage and the measurement of the current intensity resulting across the specimen, for frequency values in the range [500 Hz – 50 kHz]. The complex impedance of the soil specimen is due to both resistance, i.e. opposition to current, and reactance, i.e. tendency of the system to yield and retrieve energy, and it depends on the specimen water content. An on-purpose experimental plan has been conceived and is presented herein, aimed at building a calibration function for deriving the water content in pyroclastic soils from the impedance measurements. Preliminary results reveal an adequate level of repeatability of the measurements and suggest the existence of a monotonic correlation between the impedance modulus and the gravimetric water content.
Unsaturated seepage analysis for an ordinary solid waste sanitary landfill in Costa Rica
Authors: Baltodano-Goulding Rafael , Poveda-Montoya Alonso
Published: April 2023

Sanitary Landfills in tropical areas are subjected to specific conditions such as high temperatures, intense precipitation, and highly organic solid waste with high biodegradation rates. Unsaturated seepage inside the cells of an Ordinary Solid Waste (OSW) Sanitary Landfill in Costa Rica, Central America was studied. It is essential to better understand the seepage behavior for this type of disposal infrastructure due to its physical and hydraulic properties high variation and degradation of the deposited materials, which are complex and exhibit high uncertainty. It is imperative that leachate movement inside the cells of the landfill is accurately estimated to design more efficient systems and optimize the sanitary landfill operation. Field exploration was performed to extract samples from the field representing different OSW ages. Then, a series of laboratory testing was performed to obtain the physical, hydraulic properties, and biodegradation behavior of the OSW and cover soil such as specific gravity of the solids, grain size distribution, Soil-water characteristic curve, K-curve, and Atterberg limits. Additionally, climatic conditions affecting the degree of saturation were assessed by performing a water balance. This information was utilized to estimate flow rates for different scenarios using a HELP model, an empirical model, and two different models using the SlideTM software from RocscienceTM and later on compare them to actual field data available. The model that better predicted the actual flow rate was the HELP model.
Time-dependent hydrophobic characterisation of granular materials synthesised with commercial chemical agents
Authors: Saulick Yunesh , Lok Cheuk Sze Chelsea , Lourenço Sérgio
Published: April 2023

The impact of hydrophobicity on unsaturated granular materials is important because suction is a function of the degree of saturation as well as the surface tension and contact angle of the water menisci. In this study, coatings have been applied on the surfaces of a quartzitic sand at different concentrations following synthesis with eight commercial chemical agents and dimethyldichlorosilane (DMDCS) to induce hydrophobicity. Contact angle (CA) measurements and water drop penetration time (WDPT) tests have been carried out at different time intervals to investigate the hydrophobicity and its persistence. Scanning electron microscope (SEM)-energy dispersive X-ray spectroscopy (EDS) was performed to evaluate the resulting chemical composition of the sand. Results demonstrate that synthesis at high concentration (5%) caused fluctuations in CA and WDPT measurements within the first 24h. Except for one commercial chemical agent, the maximum CAs reached by the remaining agents after 24h were comparable to DMDCS (CA=119°). However, the critical concentration needed to achieve these CAs differed significantly: the lowest critical concentration amongst the commercial chemical agents was 0.2% whereas with DMDCS, the critical concentration was 0.0053%. The resulting surface properties of the synthesised granular materials with the commercial chemical agents showed increases in carbon content whereas with DMDCS, no change was recorded compared to the untreated sand. In addition to illustrating the efficacy of commercial chemical agents in inducing hydrophobicity in granular materials, this study has provided insights into the timedependent hydrophobic behaviour of granular materials following synthesis.
The performance of a Horizontal Ground Heat Exchanger (HGHE) under the seasonal ground energy storage behaviour
Authors: Tang Fujiao , Lahoori Mojdeh , Nowamooz Hossein , Rosin-Paumier Sandrine , Masrouri Farimah
Published: April 2023

A well-known backfill soil was considered to be used as the backfill substitutive material. The hydrothermal properties of the backfill material were estimated in laboratory and then injected in a numerical framework considering the atmosphere-soil-HGHE interaction. Numerical simulations were performed for a HGHE installed in the compacted backfill soil and the local materials. Two heat storage scenarios at three different installation depths were also investigated. The results show that an inlet fluid temperature of 50°C in summer increases highly the system performance (13.7% to 41.4%) while the improvement is less significant (0% to 4.8%) for the ambient inlet temperature scenario. A deeper installation depth increases also the system performance.
Assessment of the contribution and measures to reduce the impact of the railway industry on the development of global warming
Authors: Akhtyamov R.G. , Mescheriakova N.A.
Published: April 2023

A review of current approaches to the assessment of the anthropogenic impact on global warming is presented. Measures to regulate greenhouse gas emissions are analyzed, including the introduction of a carbon tax and a system of national quotas for greenhouse gas emissions. The outcomes of the assessment of the contribution of the railway industry to gross greenhouse gas emissions are presented. The potential for the application of negative emission technologies at railway transport facilities is considered. Proposals are formulated to reduce the influence of the railway industry on the development of global warming.
Assessment of damage in accidents and development of technical solutions to ensure safety on the railroad transport
Authors: Titova T.S. , Akhtyamov R.G. , Ionova N.N. , Mescheriakova N.A.
Published: April 2023

A significant portion of hydrocarbons is transported by rail. At the same time petroleum products are classified as hazardous cargoes, accidents during transportation of which may lead to emergencies. The article gives an assessment of damage from emergencies in the transportation of petroleum products by rail. Assessment of economic losses, as well as damage to the environment. At damage assessment analysis of dependence of environmental damage from the time elapsed from the moment of emergency situation till the beginning of localization and liquidation of transport emergency was conducted. Technical solutions to ensure safety have been developed and proposed. The use of the proposed devices will increase the safety of transportation of petroleum products by rail. As a result of the conducted calculations the possibility of using a complex consisting of two proposed devices to ensure safety during transportation of dangerous goods has been established.
Infrastructural constraints impeding the development of high-speed freight rail transportation in Russia
Authors: Sivertceva Elena
Published: April 2023

The article is devoted to the problem of infrastructural restrictions that hinder the development of high-speed freight transportation by rail in the Russian Federation. The relevance of the chosen topic is confirmed by the presence of a significant number of scientific publications that reflect the national specifics of the modern development of freight transportation using HSR and their infrastructure. The purpose of the article is to determine the infrastructural constraints that hinder the development of freight transportation in HSR transport systems tailored to the Russian specifics of infrastructure development. The object of the study is the infrastructure of railway transport and the rolling stock fleet, the subject is high-speed freight transportation. The main methods used in the study are an analysis and systematization of scientific publications on the topic, a quantitative analysis of open-source data, and interviews with Russian experts in the field under study. In the course of research there have been systematized the infrastructural constraints that hinder the development of high-speed freight transportation in Russia, and the possibilities of using special rolling stock have been considered. According to the results of the study of the Russian service market, there are determined the prospects for its further development through the introduction of a new type of railway transport service, “container — express”, and the factors preventing its successful adaptation. The results obtained can be useful both to the business community in terms of developing strategies and tactics for the introduction of high-speed container freight transportation into the segment of the Russian market, and to regulatory authorities in the field of transport in terms of promoting innovative business models and improving the quality of transport customer service.
Fatigue aging of insulation of traction motors of diesel locomotives
Authors: Shrajber M.
Published: April 2023

This paper analyzes the problem of occurrence and development of fatigue processes in the insulation of traction motors of autonomous locomotives. Factors causing destruction (cracking, delamination, occurrence of voids) of insulation in operation have been studied in the course of the research. Three characteristic stress cycles (reversible, repetitive, random) were described to make fatigue failure predictions. Outcomes of investigations of temperature conditions of windings of electric machines of diesel locomotives show that during operation the insulation experiences variable thermomechanical stresses. Received data can be recommended to take into account during the creation of new electric machines for diesel locomotives, as well as during the operation and resource recovery of already existing ones.
Modeling of energy-efficient direct torque control system for traction induction motor
Authors: Evstaf’ev Andrey , Pugachev Alexander
Published: April 2023

A brief analysis of existing control systems for traction electric drives with induction motors has been carried out, as a result of which it has been established that vector control and direct torque control systems are the most promising. The comparative characteristic of these control systems according to different parameters of electric drive quality has shown that in energy-saving algorithms it is appropriate to use the systems of direct torque control. The work aims to simulate the electric drive with a direct torque control system, which provides the reduction of power losses in an asynchronous motor. The value of the stator winding power factor is chosen as a control action. The calculation and functional dependences between the main parameters of the control system and the induction motor are synthesized, the fulfillment of which allows reducing duce power losses. The functional diagram of the electric drive with an energy-efficient control system is given. The hardware of this control system does not differ from the currently used frequency converters. In the power channel of the frequency converter, a three-level autonomous voltage inverter with locking diodes is used. The results of modeling for electric drive with 11 kW motor, analysis of which showed the adequacy of the developed model and performance of the synthesized control system, the efficiency of the electric drive with energy-efficient control system increases to 18% compared with the classical direct torque control system.
Laboratory measurements of dispersed soils as construction materials for railway embankments
Authors: Konkov Alexander , Sokornov Anton , Zamorin Valeriy
Published: April 2023

Compacted construction sand - dispersed soil - is the main construction material for the construction of railway embankments. The supplier is obliged to present the main physico-mechanical properties of the building material not in free-flowing state, but in a compacted state, in which the material will work as part of railway embankments. A major problem in laboratory dispersed soil application tests is the inability to keep the specimen in its compacted state before placing it in a shear instrument or stabilisation meter. Hence, laboratory testing of dispersed soils can only be carried out in the bulk state and therefore the question of directly determining the physical and mechanical characteristics of building materials at their maximum density remains open. Methodology of direct testing of compacted samples in a single plane shear apparatus for determination of strength properties was developed and tested by the authors of the article, and also the methodology of determination of deformation properties by indirect way was suggested for preliminary evaluation of soil suitability as a building material for construction of railway embankments.
Development of contactless switching devices for asynchronous machines in order to save energy and resources
Authors: Toirov O. , Sadullaev T. , Abdullaev D. , Jumaeva D. , Ergashev Sh. , Sapaev I.B.
Published: April 2023

To limit the inrush currents in the stator windings, various schemes for starting an asynchronous electric motor are used. In addition, the existing devices have a complex control system, which creates certain difficulties in installation and operation. But the analysis of scientific literature and materials from certain sources testifies to the insufficient study of this problem. In scientific work, the advantages and disadvantages of a new type of contactless starter are compared with contact and non-contact starters of various types. An original circuit of a new type of thyristor starter with a simplified design has been developed and manufactured, which has the ability to smoothly start and control the power consumption of asynchronous machines. Computer simulation of a new type of contactless starter with pulse-width modulation control in the Matlab Simulink program has been carried out: a pulse current is supplied to the controlled thyristor electrode on the basis of the pulse-width modulation control and the thyristor opens and passes the current, the resistance is set to decrease the input signal level. The design of the proposed starter is based on the combination of a thyristor starter with logical control, which has the ability to smoothly start and remote control of the power consumption of asynchronous electric motors, which has the ability to save energy and resources. Modern methods of implementing a logical control system, a pulse current generator with RLC filters, are proposed, and the task of remote monitoring and control of power consumption of asynchronouselectricmotors is set.
Comparative characteristics of the emissions control during the operation of passenger trains
Authors: Fedoseenko Anastasia , Komarova Ekaterina
Published: April 2023

The trend in the development of railway transport also includes the solution of such an important environmental, technological, sanitary and, to some extent, aesthetic problem as the transfer of all operated mainline passenger trains to environmentally friendly toilet complexes (EFTC). For the disposal of EFTC waste, a system has been created for the disposal of fecal waste in parking lots, which are then transported by sewage disposal machines and dumped into general treatment facilities. At the moment, as one of the possible options for industrial waste disposal of EFTC, wastewater sludge incineration plants are being considered. The method of waste incineration reduces the time, labor and financial costs of waste turnover, and taking into account the epidemiological risks of fecal waste, it has high development prospects. This article discusses similar combustion processes using the example of technologies implemented at wastewater sludge incineration plants, emissions from enterprises and the processes of formation of pollutants. And also, within the framework of this work, a comparative analysis of the control of emissions of pollutants from the combustion of sewage sludge into the atmosphere in the Russian Federation and in the EU, countries were carried out.
Organization of flow processes in transport and logistics service ecosystems using digital technologies
Authors: Kotova Evgeniia
Published: April 2023

The article is devoted to the problem of organizing the management of logistics flows in the ecosystems of transport and logistics services using modern means of digital transformation. The relevance of the chosen topic is confirmed by the importance and relevance of creating an established system of physical distribution of commodity and material values between suppliers and consumers, the basis of which, along with a developed logistics infrastructure in Russia and foreign economic activity, is transport and logistics services. The modern experience of developed economies shows that the market appeal of a product directly depends not only on its quality and cost but also on the speed of its movement through supply chains and the speed of delivery to the end consumer. The object of the study is material and information flows that correspond in digital ecosystems of transport and logistics services. The subject of the study is the economic and organizational and managerial relations associated with the formation and development of digital ecosystems of transport and logistics services. The main methods used in the study were the analysis and systematization of scientific publications on the topic, methods of designing management systems and operations research, and factor analysis. Outcomes: a list of the main digital technologies was identified; the effectiveness of their application area was analyzed. Further, the author built the scheme of the ecosystem of transport and logistics services and the scheme of interaction of its subjects. As a outcome of the analysis of the factors of influence on increasing the speed of promotion of logistics flows and goods in supply chains, the use of an integrated digital platform was recognized as the most effective. The author presented the mechanism of logistics flow management based on the creation of an integrated platform of transport and logistics services.
Modern challenges of the digital ecosystem of transport and logistics
Authors: Panyushkina Elena
Published: April 2023

The modern stage in the development of the transport industry is characterized by changes in the traditional economic models of interaction between multiple participants in the provision of transport and logistics services. These changes are caused by digital technologies that form a new digital outline of the business models of the transport industry. The digital ecosystem of transport and logistics is the basis for the breakthrough development of the Russian economy and increasing its competitiveness. However, the digital update format does not offer ready-made solutions, its deployment is constrained by the lack of the necessary number of competent personnel, the high cost of implementing and maintaining digital tools, ensuring high reliability, data preservation and security. All this requires additional resources to overcome the emerging barriers with minimal losses. In this regard, the study of the stated topic is demanded and relevant. Therefore, the purpose of the current study is to systematize the main challenges that create imbalances in the pace and scale of modification of the digital circuit of the transport and logistics ecosystem of the Russian Federation. The need to systematize the challenges in creating the digital contour of the transport and logistics ecosystem is justified by the presence of multiple economic interests in this area, including socially significant ones. However, their multidirectional and contradictory nature hinders the rate of formation of a single trend of development of the transport complex and logistics activities of all participants providing services, as well as the creation of a single digital platform that accumulates the potential for effective interaction of transport complex operators. The study was conducted using general scientific methods of knowledge, such as: generalization and systematization of scientific and statistical data on the risks of the barrier environment in the digital transformation of the Russian transport industry, forming the main challenges of the digital ecosystem of transport and logistics, their comparative analysis, synthesis, application of systemic and functional approaches.
Interrelation of levels of development of innovation potential and transport ecosystem of regions
Authors: Ksenofontova Tatiana , Velikopolskaya Elizaveta , Meng Yuan
Published: April 2023

The article analyzes the impact of innovative approaches to the formation of transport infrastructure on the level of development of innovation potential of regions, specifies the stages of formation of innovation regional systems, systematizes the approach to ranking of Russian regional innovation indices (RRII) by thematic sub-indices for the pre-pandemic period 2019 - 2020. The author notes that there is no consensus among domestic scientists about the directions of significance of a functioning and developing transport system on the region’s economy and ecosystem. On the one hand, innovations in the transport sphere influence the dynamics of income growth of the regional economy due to the reduction of costs of the transport and logistics system, increase in the speed and volume of passenger and freight traffic, growth of investment attractiveness of the region, diffusion of innovations and growth of labor productivity. However, the accompanying growth of agglomerations leads to increased density of traffic flows, environmental problems and aggravation of transport safety issues. In this connection the problems of introduction of innovations in transport, solved within the programs of increasing the level of safety of transport ecosystem of regions, formation of a qualitatively new level of development of regional innovation potential, have a high degree of influence on the regional socio-economic systems. Thus, innovation, including in the transport sector, can be considered an indispensable condition for the development of regional ecosystem.
Distance training for training and retraining of specialists on railway transport
Authors: Musamedova Kamola , Khalikov Abdulhak
Published: April 2023

The paper considers the advantages of distance learning in the education system, analyzes the implementation of the program for the training and retraining of specialists in railway transport based on the concept of the development of the higher education system in the Republic of Uzbekistan to ensure the strong integration of science, education and production in order to improve the quality of education, prepare competitive personnel, effective organization of scientific and innovative activities, taking into account the interaction of a higher educational institution and production.
Assessment for the growth prospects in freight turnover of the international transport corridor "north-south" in modern conditions
Authors: Vereskun Vladimir , Mamaev Enver , Sorokin Dmitry
Published: April 2023

The global labor division, the production planetary division and consumption markets are increasingly actualizing the issues of a reliable and sustainable organization of trade supply on the basis of the developing international transport corridors (ITCs), which are becoming points of growth not only for national economies, but also for large regions. The dynamics of the global market contribute to the increase in the number and potential of the transport corridors. The North-South transport corridor considered in the research is one of the strategic in ensuring the goods supply in the direction of the India-Iran-Azerbaijan-Russia-European Union. A predictive analysis of the development dynamics of the transport corridor freight turnover is carried out, the drivers and barriers to its development in the context of changes in the geopolitical and economic environment of the markets are determined. Attention is paid to the issues of balanced development of the potential transport corridors according to the formation of nodal transport and logistics centers at the intersections of the meridional and latitudinal corridors. It is shown that the railway transport in the ITC “North-South” in its Russian segment is becoming a key factor in the development and transportation competitiveness in comparison with alternative routes. The issues of the container transportations competitiveness of the ITC “North-South” in the context of the multimodality growth and the containerized cargo growth are considered. Prospects for the development of ITC “North-South” in the future depends on active organizational solutions in ensuring the planning and regulation supply, excluding international barriers to its development as well as the introduction of digital technologies for monitoring and managing flows.
Nanophotonics of heterostructures is an important step in solving the problem of environmental safety of transport infrastructure
Authors: Ruban Anna , Danilov Vladimir
Published: April 2023

A safe transportation ecosystem encompasses both the passenger and attendant populations as well as the abiotic infrastructure that surrounds them. Solar cells generating electricity are one of the most promising options for building a long-term energy base for the transportation ecosystem, given the trends related to the increasing role of green energy in various industries. The physical foundations for the practical implementation of solar cells are being laid by research in nanophotonics. The role of model representations based on FRET and reverse transport mechanisms are examined in the example of luminescence photodynamics of a heterostructure representing isolated films of CdSe/ZnS-TOPO quantum dots containing InP/InAsP/InP nanowires. The studies performed in this work suggest practical ways to increase the luminescence yield of heterostructures using “interfacial technologies” in core-shell structures.
Study of kinetical laws of process of the catalytic synthesis of nanocarbon from methane
Authors: Kholmirzaeva Kh.N. , Fayzullayev N.I. , Abdazimov A.
Published: April 2023

In the study, the kinetic laws of the process of catalytic synthesis of nanoglyceum from methane were studied in the presence of a catalyst containing Fe2(MoO4)3*MoO3/HSZ. The catalyst containing Fe2(MoO4)3*MoO3/HSZ was prepared by hydrothermal processing. An Empyrean, Malvern Panalytical (Germany) X-ray Diffractometer (XRD) equipped with a modern computer was used to perform X-ray analysis of the samples. The phase composition of the nanocarbon was analyzed using a semi-quantitative method using X-ray diffractograms. The morphology and structure of the product using electron illumination microscopy (accelerating voltage of 40 to 120 kV, cathode-tungsten) in a microscope brand JEM-1400 (JEOL, Japan), were also examined using a scanning electron microscope brand JSM-7001F (JEOL). At a linear velocity of 20 cm/min of gas and a mass of 10 mg of catalyst, the effect of temperature on the synthesis of nanocarbons in the Fe2(MoO4)3*MoO3catalyst was investigated. The work aims to study the kinetic laws of the process of catalytic synthesis of nanocarbon from methane and some characteristics of the resulting product and catalyst.
Investigation of the effect of conductive fillers on the electrical conductive and strength properties of rubber
Authors: Pazilova Dilnoza , Maksudova Umida , Khalikov A. , Abdurahimov Zokhid , Allayarova Oltin
Published: April 2023

A study was made of the conductive filler P-803 in a rubber composition based on butadiene methylstyrene rubber SKMS-30ARKM-15, which leads to an increase in electrical conductivity. Carbon black P-803, in addition to increasing the electrical conductivity of the material, improves the technical properties of the rubber composition.
Simulation of a single interaction of an abrasive particle with the surface of a part during blasting
Authors: Shodmonkulov Zokhir , Islomova Khafiza , Ortikov Oybek , Karimbayev Djasurbek , Muminova Nargiza
Published: April 2023

It is shown that when modeling a single interaction of an abrasive particle with the surface of a part in the process of collision under air (liquid) pressure, it is necessary to take into account the specifics of impact-abrasive wear, when the separation of a wear particle is preceded by metal destruction. In the process of schematization of the contact interaction during abrasive blasting, some commonality with the shot blasting process and a number of assumptions typical for grinding, when micro cutting with a single abrasive grain is considered, are taken into account.
Research primary processing of live of silk cocoons in a solar installation
Authors: Mirsaatov Ravshanbek , Abdullaev Jasur , Urolova Gulbakhor
Published: April 2023

This article presents the results of research to determine the main technical and economic indicators of a new installation we have created for marinating cocoons with the help of solar radiation energy. The possibility of marinating cocoons both on sunny and cloudy days has been proven through direct and indirect use of the energy of solar radiation. The performance of the installation, the temperature inside the drying chamber and the time for complete marinating of cocoons were determined. On the basis of the data obtained, it can be said that the installation provides complete of marinating cocoons and the use of this installation contributes to 100 percent savings in energy resources spent for freezing cocoons.
Calculated model of a lubricant in a bearing with a non-standard support profile of a sleeve and a metal-coated shaft
Authors: Abdurahman Khaidar , Mukutadze Murman , Badakhov Grigory , Zinoviev Nikita , Shvedova Valentina
Published: April 2023

In this work, on the basis of the flow equation of a truly viscous liquid, the continuity equation, and the equation describing the radius of the molten contour of the shaft coating, taking into account the dissipation rate of mechanical energy, an asymptotic and exact self-similar solution was found for the zero (without taking into account the melt) and the first (taking into account the melt) approximation of a radial bearing with a non-standard support profile adapted to friction conditions in hydrodynamic mode when the metal coating lubricates the shaft surface, taking into account the dependence of viscosity on pressure. An analytical dependence is obtained for the radius of the molten surface of the metal coating, as well as for the field of velocities and pressures at zero and first approximations. In addition, the main operating characteristics of the friction pair under consideration, the load capacity and the friction force are determined. The influence of the parameters characterizing the melt of the coating, the support profile adapted to the friction conditions, the dependence of the viscosity on the pressure on the load capacity and the friction force is estimated.
Representation of a mathematical model of chemical-technological processes with acceleration through a continuous function
Authors: Fayzullaev S. , Karimova N. , Fayzullaev U. , Tojikhujaeva N.
Published: April 2023

This article discusses the construction of a mathematical model of accelerated chemical-technological processes. Usually, in practice, the problem of building models of multi-stage processes, as a rule, is complicated by the universality, uncertainty and nonlinearity of the objects being modeled, the complete or partial lack of expert experience and an analytical description of dependencies. Mathematical models describing chemical technologies are considered to break down the state into discrete stages. The study below allows us to recommend stage processes to be considered as continuous functions.
System of consistent rotation of speeds of drive electric motors of movement mechanisms of overhead cranes
Authors: Abidov K. , Dadajanov K. , Absoatov U. , Sabitov S.
Published: April 2023

work is devoted to the study of the electric drive of overhead cranes and the creation of a new reliable system of a multi-motor electric drive with a coordinated rotation of the speeds of the drive motors of the movement mechanisms of overhead cranes. The electromechanical travel system of an overhead crane is a complex multi-mass elastically connected system controlled by a multi-motor electric drive, which is subject to a large number of force factors. The main trends in the development of the electric drive of overhead cranes are to increase the reliability of its operation and the range of speed control. The study of the electromechanical system of the mechanism of movement of the crane bridge indicates that the metal structure of the crane is subject to dangerous elastic transverse deformations, the limitation of which can be ensured by optimizing the electric drive system. For overhead technological cranes, the most promising is the use of a coordinated rotation system in the electric drive of the crane movement mechanism based on the principle of an electric working shaft.
Technological clearances in machines for mechanical processing of cotton seeds
Authors: Ruziev A.
Published: April 2023

The paper considers the issues of the possibility of damage to sowing cotton seeds during mechanical processing. Sowing cotton seeds can be processed in various technological processes and devices. In most cases, seed processing takes place between the processing surfaces in the technological gaps between them. The paper considers cases of jamming and damage of seeds in the technological gaps of delintering machines with metal- brush working bodies when delintering cotton seeds. Seed damage depends on the size of the seeds, the configuration of the gaps and the type of processing surfaces. Theoretically, the optimal sizes of technological gaps are determined from the condition of preventing the possibility of jamming of seeds in them during processing, which leads to damage and destruction of seeds. The data obtained are confirmed by experimental data and the optimal values of technological gaps are established based on the prevention of seed damage, plant productivity and changes in the germination of cotton seeds.
Portable drum grain dryer
Authors: Sobirov X. , Xakimov M.
Published: April 2023

The article improves the method of increasing energy efficiency and the design of the dryer drum by accelerating the process of drying the grain of the grain dryer and reducing the time spent on drying the product.
Mathematical model of machining errors on CNC lathes
Authors: Akbarov Kh.
Published: April 2023

An analysis of the conditions of operation of CNC lathes. A mathematical model of machining errors has been constructed, which allows one to get an idea of the nature of changing the dimensions of parts in the order of their sequential processing on the machine, which is an important aspect in solving the problem of controlling machining accuracy.
Ensure the quality of the surface layer of parts in high-speed end milling of hardened steels
Authors: Fayzimatov Sh. , Abdullaev B.
Published: April 2023

The article discusses with the development of technology, materials that are difficult to process using existing technologies are widely used. For example, hardened steels of high hardness are processed by grinding. This leads to the formation of a surface layer with tensile residual stresses, burns and a large inhomogeneity of the structure, which negatively affects the functional properties of the manufactured parts. The advent of high-speed machining (HSM) has made it possible to increase cutting performance by several times. However, in order to further improve the process, it is necessary to pay special attention to the quality of the products. The leading role is played by ensuring the quality of the surface layer.
Automated verification of information models for capital construction projects to mitigate environmental impact
Authors: Ostashev Roman
Published: April 2023

Digitalisation of the construction industry is changing the processes of the sector and the use of information about the elements allows various automated checks to be carried out, including checks to reduce the environmental impact of capital construction projects. The study examines ways of dealing with such information, examples of verification algorithms and a means of determining the value of verification.
State support for agriculture based on the development of commodity lending in animal husbandry
Authors: Korshikova Elena , Titorenko Konstantin , Moskaleva Maria , Zhichkin Kirill , Nosov Vladimir , Zhichkina Lyudmila
Published: April 2023

The relevance of the study is due to the fact that commodity lending is a fairly new procedure for agricultural producers in the field of state support, it is designed to ensure the stable development and support of the main agricultural producers, including livestock. The purpose of the study is to improve state support for the agro-industrial complex, taking into account commodity lending. Competent organization of the process of commodity lending, taking into account all possible directions for improving this activity, will ensure the smooth and efficient operation of SUE SR “Veles”, the Ministry of Agriculture of the region, agricultural producers of the agro-industrial complex in the field of commodity lending and, as a result, will strengthen the economy of the region as a whole. At the same time, in order to improve the efficiency of commodity lending in the agro-industrial complex of the Samara region, it is proposed to introduce a system of control over the use of funds allocated for commodity lending, according to grants, subsidies, state support, to optimize the targeting of the received funds for commodity lending, in order to prevent their further use for other purposes.