Smart maintenance scheduling via predictive logistics for post-flight engine maintenance in Central Asia
This paper presents a data-driven approach to post-flight aircraft engine maintenance based on Smart Maintenance Scheduling via Predictive Logistics (SMS-PL). Unlike conventional time- or cycle-based programs, SMS-PL integrates environmental exposure, operational stress indicators, and digital logistics planning to dynamically prioritize inspections and material preparation. The study focuses on Central Asian operations characterized by large temperature excursions, frequent dust exposure, and dispersed maintenance infrastructure. The proposed framework combines environmental monitoring, flight-path analytics, and maintenance history to form a per-flight Maintenance Severity Index (MSI) that supports proactive decisions. Conceptual analysis indicates that predictive logistics can reduce turnaround delays, improve spare-part positioning, and raise effective fleet readiness under regional constraints. The approach aligns maintenance activity with measured operating context, supporting reliability, efficiency, and sustainability goals in arid environments.
predictive maintenance, logistics scheduling, Central Asia, post-flight maintenance, aircraft engine, maintenance severity index, environmental impact, data-driven maintenance
Analysis of the freight transportation technology efficiency on the “Bukhara – Miskin” and “Angren – Pap” railway lines
This article presents a comparative analysis of the operational efficiency of freight transportation technologies on the “Bukhara – Miskin” and “Angren – Pop” railway lines. The study analyzes the infrastructure conditions, freight traffic volume, train speed, transit time, and logistics infrastructure development level of the railway lines. The operational efficiency of freight transportation was evaluated based on relative efficiency indicators considering freight volume, transit time, and route length. The results show that operational efficiency on the “Angren – Pop” railway line is mainly influenced by geographical and engineering factors, while on the “Bukhara – Miskin” line efficiency depends on logistics infrastructure development and freight flow volume. Based on the research results, scientific recommendations for improving freight transportation efficiency were developed.
railway transport, freight transportation, operational efficiency, logistics system, railway infrastructure, transit process
Enhancing the reliability of railway track circuit power supply systems using a microcontroller-based self-checking dual-channel architecture
This article analyzes the types of track circuits currently used at railway stations of Uzbekistan Railways and their distribution. The study is based on operational data collected from 244 stations. Using statistical analysis and diagrammatic visualization methods, the frequency ranges, design characteristics, and application shares of the track circuits were identified, and their operational efficiency was evaluated. The results indicate that 25 Hz and 50 Hz track circuits constitute the dominant share; however, the presence of numerous low-share yet diverse modifications reveals a high level of system fragmentation. This condition complicates operation, maintenance, and modernization processes. The paper substantiates the prospects for standardizing track circuits and modernizing them through the implementation of microcontroller-based power supply and phase-sensitive devices.
track circuit, railway signaling, 25 Hz frequency, 50 Hz frequency, modern power supply, phase-sensitive device
Selection of a method for market segmentation in the field of transport and logistics services
The paper discusses approaches to segmenting the client base in the field of transport, logistics, and freight forwarding services. Particular attention is paid to the application of ABC and XYZ analysis methods as tools that make it possible to classify clients according to their impact on financial results and the stability of demand for services. It is shown that the use of a combined ABC/XYZ matrix makes it possible to improve management efficiency, optimize resource allocation, and develop a differentiated approach to customer service. The possibility of applying a flexible management system based on data analysis, profitability monitoring, and consideration of the specifics of interaction with counterparties is examined. It is concluded that the proposed methods should be tested using real information databases of transport and logistics companies in order to confirm their effectiveness.
market segmentation, transport and logistics services, ABC analysis, XYZ analysis, ABC/XYZ matrix, client base, logistics, inventory management, financial results, operational management, freight forwarding companies
Details and solutions to safety issues at railway LC
Railway level crossings (LC) are critical junctions where road and rail traffic intersect, often becoming hotspots for serious accidents due to technical, human, and infrastructural failures. This study examines safety issues at railway level crossings through a multi-method approach that includes statistical analysis, GIS mapping, and case study evaluations. Using RStudio for data visualization and statistical modeling, we analyze patterns of incidents and explore viable solutions. The findings indicate that automation, public awareness campaigns, and sensor-based early warning systems significantly reduce accident rates. It also shows that building modern and safe level crossings using IoT and AI is an urgent need. Recommendations for future infrastructure planning and policy reforms are proposed.
railway level crossings, safety issues, accident analysis, RStudio, GIS, sensor systems, machine learning
Methods and solutions for reducing the amount of dust in order to ensure the sustainability of cities
The purpose of scientific work is to provide the population with clean air and reduce the dust content of the city of Tashkent in order to avoid the formation of foggy dust generated from road transport, manufacturing enterprises and various causes.Moderate conditions are created by turning dusty areas into clean and tidy areas with water spray drones. They will be fitted with water tanks and a LIDAR system, the flight altitude and the object will be determined.. Using the findings of this project, it became possible to prevent viral infections in the city by cleaning the air from dust that contains microbes. As a result, the amount of dust in the environment decreases slightly depending on the number of drones. Also, the dust accumulated on the trees will be removed by artificial rain. The habitat becomes temperate for breathing.
Ecology and roads: environmental impact of road transport and sustainable solutions
Road transportation is one of the most important components of modern infrastructure and economic development. However, the rapid expansion of road networks and the increase in traffic intensity have led to significant environmental challenges. Road transport contributes to air pollution, noise pollution, soil degradation, water contamination, and habitat fragmentation. These environmental impacts affect ecosystems, human health, and the sustainability of urban and rural environments. This study analyzes the ecological impact of road infrastructure and traffic flows on the environment. The research focuses on major environmental indicators such as atmospheric emissions, noise levels, soil contamination, and water pollution near road networks. Statistical analysis, environmental monitoring methods, and traffic flow modeling techniques were used to evaluate the environmental impact of road transportation. The results show that increasing traffic intensity significantly contributes to higher concentrations of harmful emissions such as carbon dioxide (CO₂), nitrogen oxides (NOx), and particulate matter (PM). Furthermore, noise levels in areas adjacent to highways often exceed recommended environmental standards. The study also highlights the importance of sustainable road design, environmental monitoring systems, and green transportation technologies. The findings suggest that integrating ecological considerations into road planning and transportation management can significantly reduce environmental risks and improve sustainability. The implementation of intelligent transportation systems, environmentally friendly materials, and green infrastructure can play a key role in reducing the environmental impact of road transportation.
Road ecology, environmental impact, road transportation, air pollution, sustainable transport, environmental monitoring, traffic emissions
The location of transport and logistics centers in Uzbekistan included in the list of international dry ports: regional opportunities and their integration with international transport corridors
This article analyzes the geographical location, infrastructural capacities, and the integration of transport and logistics centers included in the list of international dry ports of the Republic of Uzbekistan with international transport corridors. Within the framework of the study, the territorial distribution of 24 transport and logistics centers located across the country, their multimodal transport capabilities, proximity to railway lines and highways, and their integration with international transport corridors were comprehensively assessed. During the analysis, the level of integration of these logistics facilities with the TRACECA and CAREC corridors, as well as with the Middle and Southern transport corridors, and the Asian Highway and Trans- Asian Railway networks, was examined through a comparative analysis. According to the results of the study, the majority of Uzbekistan’s dry ports are located along international transport corridors, and their role in the national transport and logistics system is significant in enhancing the country’s transit potential, diversifying cargo flows, and developing a multimodal transportation system. At the same time, it was observed that the logistics infrastructure is unevenly distributed in certain regions. The results of the research contribute to the development of scientifically grounded recommendations aimed at strengthening Uzbekistan’s role in the international transport and logistics system, developing regional logistics infrastructure, increasing transit opportunities, and establishing new transport and logistics centers in strategically important areas. The research findings are presented in the form of systematized tables, analytical diagrams, and cartographic schemes, which provide a comprehensive understanding of the role of logistics centers in increasing Uzbekistan’s transit potential and enhancing transport competitiveness.
Dry port, transport and logistics center, international transport corridors, multimodal transport, transit potential, TRACECA corridor, CAREC corridor, Asian Highway Network, Trans-Asian Railway Network, Uzbekistan
Organizational technological mechanisms for the development of outsourcing services in the organization of cargo transportation in transport and logistics enterprises
The article reviews the existing organizational and technological mechanisms in the world and in Uzbekistan for the implementation of cargo transportation processes in transport and logistics enterprises using outsourcing services. In international experience, the structure of cargo and logistics functions based on the services of 3PL (Third-Party Logistic) and 4PL (Fourth-Party Logistic) providers is analyzed. The prospects of logistics services and production mechanisms, and existing opportunities, are compared based on the SWOT model and suggestions are made.
outsourcing, transport logistics, organizational mechanisms, technological mechanisms, transport system, cost reduction
Client–server architecture for registration and accounting of railway automation and telemechanics devices
This article describes the relationship between the maintenance and control schemes of devices in the railway transport automation and telemechanics system. Unified workflows, provenance capture, and analytics-ready data support decisions from engineering and construction to acceptance, service, upgrade, and including termination. The platform follows a client–server model with strict roles and systematic validation. A relational center maintains device passports, installation coordinates, status changes, scheduled swaps, decommissions, and repair logs. QR/RFID identification enables server services indexing, quick search, dashboards, and recurring reports. Using them will result in faster device startup, higher data quality, and transparent results across repair and technology departments. Standard interfaces support integration with adjacent enterprise systems for end-to-end safety, reliability, and efficiency. Operational tools include QR-code and RFID tag – based identification, configurable templates for remote inventories, and automated reporting to support planning and execution at repair and technological sections. Services cover user information, database integrity and recovery, and centralized configuration. Application window formalizes a three-level service model that connects machine interfaces and field mechanics, operators, and administrators. Expected outcomes are accelerated commissioning, improved data quality, and tighter safety assurance via real-time status visibility and auditable document flow.
Railway automation and telemechanics, signaling, centralization, and blocking, QR/RFID identification, server, repair and technological section
Computer model that allows assessing the electromagnetic effect of traction transformers on adjacent lines and systems
In the article, a computer model was developed that allows assessing the influence of traction transformers on surrounding electrical systems in various modes. According to the results of the computer model, it was established that when the same high-power load is connected to the windings AC and BC, the most dangerous electromagnetic process occurs, adjacent systems are exposed to maximum electromagnetic influence in this mode, and dangerous disruption of electromagnetic compatibility occurs in adjacent systems. Also, according to the conducted research, the difference between the computer model and the results of the experiment did not exceed 5-7%.
electromagnetic effect, induced voltage, adjacent line, traction transformer, electromagnetic compatibility, computer model
Methodology for developing optimal-system models to improve investment efficiency in regions: evidence from the Kashkadarya region
This article improving the efficiency of investment utilization remains a central challenge for regional economic development, particularly in transition economies where structural imbalances, institutional constraints, and uneven capital allocation hinder sustainable growth. This study develops a comprehensive methodological framework for constructing optimal-system models aimed at enhancing investment efficiency at the regional level, using the Kashkadarya region of Uzbekistan as a case study. The research integrates systems theory, multi-criteria optimization techniques, and econometric modeling to design a structured investment efficiency model. The proposed framework evaluates investment allocation across key sectors based on economic return, employment generation, social impact, and environmental sustainability. A mathematical optimization model is formulated to determine the optimal distribution of investment resources under budgetary and structural constraints. The study demonstrates that a system-based investment allocation approach significantly improves regional performance indicators compared to traditional allocation mechanisms. Policy implications suggest the need for institutional coordination, data-driven investment planning, and dynamic monitoring mechanisms. The findings contribute to regional economic modeling literature and provide practical guidance for policymakers in emerging economies.
investment efficiency, regional development, optimization model, system-based approach, Kashkadarya region, economic modeling
Diagnostics of locomotive power electrical circuits using the USTA device during rheostatic tests (Based on 2TE10M / UzTE16M)
This article examines the principles of diagnosing locomotive power electrical circuits using the USTA microprocessor-based control system during rheostatic testing. The structure of the system, control algorithms, monitoring of analog and discrete signals, and verification of diesel-generator characteristics are analyzed. The study demonstrates that the application of USTA improves regulation accuracy, enhances protection reliability, and simplifies diagnostic procedures during maintenance.
USTA, rheostatic testing, traction generator, diagnostics, diesel locomotive, power circuits, field weakening
Prospects for implementing public-private partnership in managing the resource capacity of the road – transport complex
The article examines the prospects of introducing public-private partnership (PPP) in managing the resource potential of Uzbekistan's road-transport complex. It analyzes foreign experience in effective state property management, particularly through inter-property cooperation forms such as concessions, special contracts, and production-sharing agreements. The necessity of applying the concession form of this partnership in Uzbekistan's road-transport sector is substantiated, as the high share of state ownership in producing socially significant goods (road infrastructure) currently leads to inefficient use of resources. The study emphasizes the possibility of implementing paid toll roads, bridges, motels, quarries, service facilities, and other projects through concessions. It is proposed to carry out such projects via a joint venture organized as a joint-stock company, which would create opportunities to enhance the country's transit potential. As a result, the proposed initiative is presented as the first concession project in Uzbekistan that would contribute significantly to the development of the road-transport complex.
Public-Private Partnership, concession, road-transport complex, paid motor roads, transit potential, highway, joint venture
Application of artificial intelligence in traffic management in the city of Jizzakh (Uzbekistan)
This paper investigates the application of artificial intelligence methods for traffic management in the city of Jizzakh, including traffic flow prediction, optimization of traffic signal cycles, management of transport interchange hubs, and enhancement of road traffic safety. Simulation experiments were conducted using deep learning and reinforcement learning techniques based on real traffic data collected over a five-month period. The obtained results demonstrate a reduction in the average vehicle waiting time at intersections by 30%, an increase in arterial road capacity by 22%, and a 19% reduction in accident risk following the implementation of AI-based algorithms. The novelty of the study lies in the integration of adaptive AI models that account for the local characteristics of the Jizzakh transport network and the operational features of transport interchange hubs, which have not been previously addressed in regional studies.
artificial intelligence, traffic management, adaptive traffic signal control, traffic flow prediction, transport interchange hubs, road traffic safety
Predicting the rheological response of Uzbekistan’s polymer-modified binders: a comparative analysis of conventional empirical tests and the complex shear modulus
The transition towards performance-based pavement specifications in Central Asia is often hindered by the limited availability of advanced rheological instrumentation. This study bridges this gap by characterizing the viscoelastic performance of asphalt binders currently utilized in Uzbekistan through theoretical modeling based on routine quality control data. A comprehensive laboratory program was conducted on conventional unmodified bitumen (BND 50/70) and three complex modified binders: locally produced polymer-modified bitumen (PMB), crumb rubber modified ('Rezina') bitumen, and sulfur-extended ('Sero') bitumen. Using experimental results from Penetration, Softening Point, and Elastic Recovery tests, the Complex Shear Modulus (G*) and Phase Angle were estimated using the Ullidtz and Van der Poel predictive models, calibrated for the non-Newtonian behavior of modified binders. The study provides a cost-effective framework for predicting high-temperature rutting resistance, demonstrating how traditional empirical data can be transformed into fundamental rheological parameters for mechanistic-empirical pavement design in Uzbekistan's specific climatic conditions.
Rheology of bitumen, complex shear modulus, phase angle, Ullidtz model, Van der Poel predictive model
Problems and solutions of organizing pedagogical practice remotely for students of technological education
This article examines the challenges and solutions of organizing distance pedagogical practice for students in technological education. Distance practice is an essential tool for developing students’ professional competencies, applying theoretical knowledge in practice, utilizing modern technologies, and forming social collaboration skills. The article analyzes technical, methodological, psychological, and assessment-related problems and provides recommendations and effective strategies for organizing distance pedagogical practice.
Distance practice, pedagogical practice, technological education, virtual laboratory, professional training, online learning, methodological solutions
Bayesian shrinkage estimation for extreme values in 3D satellite-based geospatial modeling of oil and gas systems
This study proposes an integrated methodological framework for modeling extreme geospatial parameters in oil and gas system design using 3D satellite-derived data. The approach combines extreme value theory with Bayesian shrinkage estimation under asymmetric loss functions, employing the Fréchet distribution to capture heavy-tailed behavior and rare extreme events commonly observed in geospatial variables. The proposed model enables stable and realistic estimation of extreme values by balancing sensitivity to genuine extremes with robustness against noise and outliers. Simulation-based analysis demonstrates that Bayesian shrinkage estimation improves the reliability and interpretability of extreme-value parameters compared to classical estimation methods. The resulting posterior uncertainty measures provide valuable decision-support information, allowing engineers to assess confidence levels associated with extreme geospatial predictions. The findings highlight the practical relevance of incorporating decision-theoretic principles into geospatial modeling workflows. Overall, the study contributes a robust and flexible framework for uncertainty-aware 3D geospatial modeling and supports risk-sensitive decision making in complex geological environments relevant to oil and gas applications.
Bayesian shrinkage estimation, extreme value theory, Fréchet distribution, 3D geospatial modeling, satellite-derived data, oil and gas systems
Economic efficiency of glass fiber reinforced concrete
In this article, the technical and economic efficiency of glass fiber reinforced concrete in building structures has been comprehensively studied. In the research, the effect of adding 0.1–0.5% glass fibers to B25 class concrete on flexural and tensile strength was experimentally evaluated. The results showed that the fibers increase the crack resistance of concrete and strengthen the internal structure due to micro-reinforcement. This leads to a delayed appearance of cracks in structural elements and limits their development. It was also determined that there is a possibility to reduce the amount of reinforcement or optimize cross-sections. The article presents an economic comparison of mix compositions for 1 m³ of conventional B25 concrete and glass fiber concrete. According to the calculations, the application of fiber concrete provides an economic benefit of 22,410 sum per cubic meter. This benefit was also determined using the example of beam structures in a planned 4-story residential building in Namangan region. Considering the total concrete consumption of 123.4 m³ in the beams, the total savings amount to 2.77 million sums. It is scientifically substantiated that the economic benefit significantly increases when applied to numerous typical buildings and at the scale of concrete plants. The obtained results confirm the high efficiency of wide implementation of glass fiber concrete in practical construction.
Beam, glass fiber, fiber-reinforced concrete, structure, reinforced concrete
A GIS framework for road asset monitoring in mountainous regions: a Tajikistan case
geoinformation monitoring, satellite data, GIS portal, roadway degradation, mountain roads, transport accessibility, RAMS
Methodology for Assessing Embodied Carbon in Bridge Structures
This study introduces a methodology for evaluating the embodied carbon of building materials and structural elements. The approach includes relevant formulas and step-by-step procedures to systematically assess carbon emissions associated with material production and construction processes. While actual numerical results are not presented in this work, the methodology provides a framework for applying these calculations in practice. Operational carbon is not considered in this study but is identified as a topic for future research. Overall, the proposed methodology offers a structured approach to analyzing embodied carbon, supporting further studies and adaptations in construction projects aimed at sustainable development.
Bridge sustainability, Embodied carbon, Operational carbon, Life Cycle Assessment, Environmental impact, Infrastructure in Uzbekistan
Research on the thermal conductivity of products made from industrial waste
The article provides information on the condition and types of building materials produced in our country on the basis of industrial waste.
building materials produced on the basis of industrial waste ,thermal insulation, energy saving, foam concrete, aerated concrete, asbestos
Subsidence of the railway track embankment at the boundaries of water pipelines
The article investigates the impact of water pipeline malfunctions on railway embankment parameters, specifically examining the effect of soil moisture on the deformation (settlement) of both the embankment and the water pipeline itself. To solve this problem, the finite element method was employed, and multiple variant calculations were performed using Midas software. The study determined and compared the deformation (settlement) of the embankment and water pipeline for two types of soil moisture, embankment heights of 2, 3, 4, 5, and 6 meters, and a combination of three types of loads.
railway, water pipes, earthwork, moisture, settlement, deformation
Optimization of the design of bridge intermediate supports
This scientific article covers issues of improving the intermediate supports of bridges. The design features of existing monolithic supports were analyzed, and existing shortcomings in terms of their shape, dimensions, and material consumption were identified. Three design options based on monolithic reinforced concrete have been proposed, and their seismic resistance, load-bearing capacity, and economic efficiency have been parametrically compared. It has been proven that the second proposed structural variant is the most optimal solution in terms of material consumption, economic indicators, and seismic resistance. The research results provide scientifically based recommendations for practical application in improving bridge intermediate supports.
intermediate support, monolithic reinforced concrete, seismic stability, structural form, parametric analysis, load capacity, economic efficiency, optimization
and Assessment of Critical Spatial Deformations and Internal Force States of Continuous Monolithic Reinforced Concrete Bridges under Strong Seismic Actions Using MiDAS Civil
The article presents the results of spatial seismic calculations for a continuous monolithic reinforced concrete bridge structure using the spectral method implemented in the MiDAS Civil software package. In the study, a spatial computational model of the structure was developed, taking into account the combined spatial behavior of the bridge span structure, intermediate and end supports, as well as the prestressed reinforcement system. The computational model is based on the finite element method, considering the stiffness properties of the structure and the interaction of bending, torsional, and transverse shear deformations. Through spectral analysis, the internal forces and displacements induced by standard seismic loads on the bridge's structural elements were evaluated. The obtained results allow for the determination of seismic stability in continuous monolithic bridges, refinement of calculation schemes, and optimization of design and technological solutions for seismically active regions.
transportation structures, bridge, earthquake-resistant design, Midas Civil, linear spectral analysis, post-tension
Assessment of the block strength of dispersely-armonized basalt fiber, complex-modified small-grain fiber concrete
The article presents the results of a study on the impact strength of fibroconcrete with basalt fiber obtained on the basis of a complexally modified ash aggregate and "POLIMIX" superplasticizer cement binder. Based on the conducted experimental studies, it was established that during the volumetric hardening of fine-grained concrete with basalt fiber, as well as the complex modification of the cement matrix of basalt fiber concrete with ash filler and "POLIMIX" superplasticizer, an ultra-strong surface layer is formed in the composite, which creates a monolithic mineral enclosure, significantly improving all the physical and mechanical properties of the material.
concrete, strength, stability, corrosion, elasticity modulus, fine-grained concrete, alkali resistance and acid resistance
Economic efficiency of implementing modern prefabricated reinforced retaining walls
In this article, the economic efficiency of implementing modern prefabricated reinforced retaining walls is evaluated by comparing the costs associated with the construction and installation of traditionally used retaining walls, as well as the expenses required to eliminate potential shortcomings and problems during their service life. Justifying the efficiency of prefabricated reinforced retaining walls plays an important role in enhancing the technical and economic performance of reinforced concrete highway bridges and overpasses. Replacing traditionally used retaining walls with prefabricated reinforced retaining walls allows for accelerated construction processes, more effective allocation of materials and labor, and reduction of long-term operational costs of the structures.
Prefabricated panel, bridge approaches, economic efficiency, bridge, overpass, retaining wall, structure, concrete, reinforcement, service life, technical condition
Methods for determining soil pressure on underground structures under seismic influences
This article examines methods for determining soil pressure on underground structures. Five methods for determining ground pressure on underground structures were considered, and the calculation results were compared and presented in the form of graphs. In conclusion, an analysis of the above-mentioned methods for calculating the seismic resistance of underground structures was conducted and their shortcomings were presented.
Pressure, soil, normal and tangential stresses, seismic impact, seismic waves, prevailing period, quasistatic load, normal tangential stresses, extreme stresses, plane, stress concentrations, wave theory, seismodynamic theory
Oscillation of a prestressed span structure of a reinforced concrete railway bridge with mass in horizontal motion
This work examines the features of calculating the strength of reinforced concrete railway bridges with a moving load and a movable oscillator. The methods of finite elements and finite differences were used. When solving the problem of oscillations of a beam with distributed parameters under the action of a moving concentrated force and mass, "parasitic oscillations" are eliminated by choosing a step in time depending on the speed of the load's movement. As an example for moving cargo or mass, the mass of the Talgo locomotive was taken. Such a mass velocity has been determined that it is possible to use the model of the force moving with a lower velocity, otherwise the model of the oscillator must be adopted. With an increase in the horizontal velocity of the oscillator, the deflection of the beam increases, and the vertical oscillations of the mass also increase.
reinforced concrete, beam, reinforcement, concentrated force, concentrated mass
Justification of the purposes of using basalt fiber in cement concrete
The creation of modern high-efficiency building materials and products, to which the demands are constantly increasing, can be successfully implemented using technologies using composite materials. Particularly promising are dispersed reinforced concrete, in which a strong matrix and reinforcing fibers are successfully combined. The matrix provides high compressive strength, bending strength, and durability, while dispersed fibers are characterized by significant tensile strength, high elastic modulus, and the ability to distribute loads throughout the entire volume. Such a combination increases crack resistance, improves the operational properties and durability of structures, and opens up new possibilities for use in modern engineering structures and industrial construction.
concrete, basalt fiber, strength, stability, corrosion, elasticity modulus, fine-grained concrete, alkali resistance and acid resistance