https://www.scopus.com/pages/publications/85211384887#:~:text=Agriculture%2C%20especially%20irrigated,Publisher%20LLC%202024.

Polymer solutions see broad applications in hydraulic fracturing, enhanced oil recovery, conformance control, and groundwater remediation. However, due to the high viscosity of polymer solutions, flows after polymer injection are often subjected to significant pressure build-up, the mechanism of which is not well studied, especially on the effect of distribution of fluids in the pores. In this study, we used microfluidics micromodels to visualize the distribution of fluids in porous media. NOA81 micromodels with close-to-real-rock pore dimensions were fabricated and used for simulating flooding experiments. Relative permeability was measured at steady-state flow rates and injection pressures. Then, fluid distribution was analyzed using microscopy image analysis. We observed that the distribution of fluids in a porous medium has a direct impact on the pressure drop. The relative permeability of water and oil after polymer flow was disproportionally low, which is consistent with core flooding experiments. The increase in the pressure drop due to polymer trapping can be correlated to occupancy, orientation and alignment of pore channels. A mathematical model was developed to describe the correlation between pore-scale fluid distributions and the end-point relative permeability; it can be used for understanding and enhancing oil/water flows during/after polymer injections. Copyright 2022, Society of Petroleum Engineers.

Ensuring transport security is a priority for any developed country. The article considers one of the constituent elements of the transport security system " technical tools that ensure the safety of transport infrastructure facilities in supply chains. To improve the safety of transport infrastructure, an effective measure is the application of a process approach to the development of management decisions with the determination of reliability and functional safety indicators throughout the life cycle of infrastructure facilities. It has been established that determining the cost of the life cycle of infrastructure facilities makes it possible to rationally plan measures for their repair and maintenance for the long-term perspective of their operation. In particular, methodological approaches and the results of calculating the life cycle cost of railway sections of transport infrastructure, on the condition of which the level of security in supply chains directly depends, are presented. © 2025 The Authors, published by EDP Sciences.

This paper analyzes the current situation of interval train control systems (railway interlocking) on the railway network of Kazakhstan, geared towards enhancing the effectiveness of railway transportation, the objective is to augment the capacity of rail lines, diminish operational expenses, minimize energy consumption, and mitigate wear on both tracks and rolling stock. To evaluate the data transmission channel of the TETRA standard, a test model with a long ping and a load test has been developed, and a two–stage test methodology has been proposed for the Zhetygen – Altynkol section. According to the results of the conducted experiments, it is proved that if the connection is lost for more than 60 seconds, the train automatically stops with an emergency braking command and, subject to the restoration of data transmission between the OBU (onboard unit) and the modem, the radio-blocking system works normally for cases with loss of communication and the board permits to move. For evaluating the influence of deploying radio communication on radio-blocking and signal strength, the Hata model within the COST231 framework was chosen. This model incorporates diverse factors contingent upon the environment, such as urban or suburban settings. The model of path loss «Loss of suburban macro-path» was chosen as a model. © 2024 Kanibek Sansyzbay et al

The purpose of this study was a comprehensive assessment of water supply of the population, territory and economic sectors in the context of water-resource regions of Turkestan region of the Republic of Kazakhstan based on integrated specific water supply index, taking into account the environmental flows of river basins, providing data on the current state of water resources, level of water supply and their changes under influence of natural and anthropogenic factors. The research methodology is based on statistical analysis, long-term information-analytical materials on the hydrological condition of rivers, territorial organization of water consumption and the population of Turkestan region. For a comprehensive assessment of water supply of the population, territory and economy, a methodology was developed that allowed to assess the current state of water supply in the territory of river basins in the region and their changes under the influence of natural and anthropogenic factors. A comparative assessment of water supply in the Turkestan region in terms of water-resource areas based on the proposed methodological approach and the created research base covering the period of 2002-2020 showed that, in general, there is a high level of water shortage, which is associated with water shortage problems in the region. The obtained results of study are of fundamental environmental and economic importance when assessing water supply and can be used as an effective tool for the assessment of the influence of water factors during socio-economic forecasting of the region’s development, especially recreational activities. © 2024 Editura Universitatii din Oradea. All rights reserved.

Enhanced oil recovery (EOR) techniques are essential for maximizing hydrocarbon extraction from mature reservoirs. CO2 injection (CO2-EOR) is a promising technology that improves oil recovery while contributing to greenhouse gas reduction. This study investigates the potential of miscible CO2-enhanced oil recovery (CO2-EOR) in the MakXX oilfield of southeastern Kazakhstan. The aim is to assess oil displacement efficiency and its impact on key rock properties, including porosity, permeability, and mineral composition, under reservoir conditions. Core flooding experiments were conducted at 13 MPa and 42 °C using high-precision equipment to replicate reservoir conditions. The core was analyzed before and after CO2 injection using SEM, EDS, and XRD. The results revealed a 54% oil recovery efficiency, accompanied by a 19% decrease in permeability and 8% reduction in porosity due to mineral precipitation and clay transformation. These findings provide insight into the performance and limitations of CO2-EOR and support its application in similar lithology. To confirm and upscale laboratory observations, numerical simulation was conducted using a compositional model. The results demonstrated improved oil recovery, pressure stabilization, and enhanced sweep efficiency under CO2 injection, supporting the scalability and field applicability of the proposed EOR approach.

This research investigated the miscible gas injection for Enhanced Oil Recovery (EOR) in a carbonate reservoir in Kazakhstan. Five mixtures, each containing varying percentages of methane, ethane, propane, carbon dioxide, and nitrogen, were studied to determine their Minimum Miscibility Pressure (MMP) values through PVTi and slim tube tests. Among them, mixtures #2 (CH4 and C3H8) and #4 (pure CO2) exhibited the best performance, with mixture #2 achieving the lowest MMP value, while CO2 showed the best miscibility at lower pressures and the option of potential carbon sequestration. Most of the results were supported by slim tube experiments, compositional simulations (Eclipse), and phase behavior analysis using Gibbs triangles and ternary diagrams. The study contributed to the EOR research by incorporating multi-component gas evaluation and advanced phase visualization, thereby filling the gaps by previous works focused on single gases. The key findings emphasized the need to balance the technical efficiency, environmental sustainability, and operational viability in gas selection, providing critical insights for optimizing the EOR strategies in similar reservoirs. © by the authors.

In this study, polymer composites based on a polypropylene (PP) matrix with the addition of cellulose and ES-40, used as a silica precursor, were investigated. These composites were designed to achieve enhanced biodegradability through the incorporation of bioavailable cellulose and to enable subsequent carbonization into carbon–silicon carbide systems. Rheological investigations revealed that the multicomponent mixtures exhibited pseudoplastic behavior over the shear rate range typical of injection molding, ensuring process stability without additional plasticization. Morphological analysis demonstrated that an optimal balance of PP, cellulose, and ES-40 promoted the formation of a three-dimensional network structure, leading to a significant increase in flexural modulus at the equal flexural strength despite some reduction in tensile strength. It was further shown that substituting fibrous cellulose with microcrystalline cellulose improved the composite homogeneity, thereby enhancing the density and mechanical properties, especially in systems with low polymer contents. Preliminary pyrolysis experiments indicated that these injection-molded composites can serve as precursors for fabricating bulk thermally stable products containing silicon carbide particles. The obtained results underscore the high potential of the developed materials for applications in conventional injection molding, the possibility of additive manufacturing, and processes requiring subsequent carbonization. © 2025 by the authors.

The global water crisis, which intensifies each year, underscores the urgent need for accurate assessment and sustainable management of freshwater resources. Lakes, as significant components of surface water systems, are particularly vulnerable to human activities and climate change due to their slow renewal rates. Western Kazakhstan, a region affected by economic development and intensive mining activities, faces acute water scarcity. A reliable water supply is crucial to meeting the requirements of industrial operations and the needs of the region’s population. Understanding the dynamics of lake systems and implementing effective conservation and restoration strategies are essential to addressing this challenge. This study, employing cartographic and remote sensing techniques, identified 323 lakes in Western Kazakhstan, covering a total area of 1944 km2. Comparative analysis with historical data from the 1960s and 1970s revealed a 23% decrease in the number of lakes exceeding 1 km2. The most significant decline was observed in the Atyrau and Mangystau Regions, where the number of such lakes diminished by a factor of three. These findings highlight the pressing need for an integrated, interdisciplinary approach to water resource management in Western Kazakhstan. © 2024 by the authors.

The growing demands for sanitary regulations in medical facilities, particularly operating rooms, highlight the importance of ensuring high air quality and minimizing airborne hospital-acquired infections. Improperly designed ventilation systems may lead to contamination of up to 90–95% of patients, especially in light of evolving threats, such as COVID-19. This study focuses on enhancing the energy efficiency and performance of air conditioning and ventilation systems for cleanrooms, where air recirculation is not permissible. A novel energy-efficient direct-flow air treatment scheme is proposed, integrating a heat pump system with adjustable thermal output. A computational fluid dynamics CFD model of a clean operating room was developed to assess the impact of inlet air velocity on aerosol particle removal and airflow stabilization time. The model also considers the effect of personnel movement. The results supported optimized air distribution, reducing microbial contamination risks, with less than 10 CFU/m3, and improved thermal performance. The proposed system was evaluated for energy and cost efficiency compared to conventional setups. Findings can inform the design and operation of cleanroom ventilation in surgical environments and other high-tech applications. This research contributes to improving indoor air quality and reducing infection risks while enhancing sustainability in healthcare infrastructure.