Репозиторий Карагандинского национального исследовательского университета имени академика Е.А. Букетова содержит научные статьи, учебные материалы, книги или разделы книг, материалы конференций профессорско-преподавательского состава (ППС). Для размещения научных трудов в институциональном репозитории заключается авторский договор о передаче неисключительных прав на использование произведения.

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    Study of the influence of electrohydraulic drilling parameters on the efficiency of hard soils destruction
    (Karaganda National Research University named after аcademician Ye.A. Buketov, 2026) Shaimerdenova K.M.; Nussupbekov B.R.; Schrager E.R.; Akhmadiyev B.A.; Nakipova S.Zh.; Rakhmankyzy A.
    This article examines several aspects of the electrohydraulic drilling method. It presents the results of an experimental study examining the influence of electrohydraulic drilling modes on the efficiency of breaking stone. A brief description and diagram of the experimental setup are provided. Quantitative relationships between the electrical parameters of the optimal mode of electrohydraulic drilling technology for breaking hard soils samples of varying thicknesses are determined. The experimental data confirm the feasibility of achieving significantly higher drilling speeds for vertical wells in hard soil compared to traditional methods.
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    Evaluation of the effectiveness of the non-kilned ash-slag gravel structure under thermal impact
    (Karaganda National Research University named after аcademician Ye.A. Buketov, 2026) Atyaksheva A.V.; Seitova Zh. A.; Issataeva A. K.; Ryasnov D. Yu.; Khamitova Ye.M.
    The article presents an analysis of the stress-deformed state results for gravels based on ash-slag mixtures, with the same specified composition, but different in structure and density under the thermal impact with temperature 500°C. The evaluation of the gravels structure was carried out in a numerical simulation of the thermostatic structural analysis process. According to the results, the two – component gravel structure shows greater thermal stability. Separation into two component structure leads to a more even distribution of iso Surfaces, which in turn eliminates the possibility of stress surges leading to sharp changes in the structural characteristics of materials accompanied by degradation processes. In two component structure, there is a reduction of a stress intensity resulting from sudden stresses surges and leading to the formation of material failure points. The maximum stress intensity of two component gravel for about1.8 ‧106 Pa in compare of single component for about 2.1‧107 Pa. The higher thermal viability of two-component gravel is demonstrated by thermal deformation due to a reduction in shear stress, which is (max) 9.03‧105 Pa, in compare of single component (max) 1.11‧107 Pa. Such conditions of the stress-deformed state indicate a greater reserve of thermal resistance for two – component gravel in compare of single component gravel and the possibility of its use as a heat protection in the composition of heat-resistant panels or independently in the temperature range up to 500°C.
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    Coupled sputtering and combustion dynamics of diverse fuel types
    (Karaganda National Research University named after аcademician Ye.A. Buketo, 2026) Bolegenova S.; Askarova A.; Ospanova Sh.; Bolegenova S.; Nurmukhanova A.; Assilbekova Sh.
    This study presents a comprehensive computational investigation of the sputtering and combustion dynamics of biodiesel and fossil diesel fuel droplets in turbulent gas flows. Advanced computational modeling and the CHEMKIN chemical kinetics framework were employed to analyze the thermophysical and chemical processes of fuel atomization, ignition, and flame propagation under varying oxidizer temperatures. The results indicate that biodiesel droplets exhibit higher mobility, enhanced mixing with the oxidizer, and more uniform heating, resulting in near-complete combustion and higher local temperatures compared to fossil diesel fuel. Soot formation during biodiesel combustion was notably lower, while carbon monoxide emissions were significantly reduced, demonstrating more efficient and cleaner combustion. Analysis of the Sauter mean diameter (SMD) highlighted improved droplet dispersion and atomization quality for biodiesel, facilitating optimized injector design and fuelair mixing. Heat flux visualization revealed stronger convective energy transfer in biodiesel flames, and flame front dynamics confirmed that biodiesel can be used in conventional internal combustion engines without modification. Overall, these findings highlight biodiesel as a sustainable, low-emission alternative to fossil diesel fuel, supporting the development of energy-efficient technologies and the transition toward cleaner, renewable fuels.
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    Study to assess electricity generation in a thermal power plant using fault tree analysis model
    (Karaganda National Research University named after аcademician Ye.A. Buketov, 2026) Nygymanova A.; Ongar B.; Sarsenbayev Y.
    This paper presents the application of Fault Tree Analysis model for availability assessment of thermal power plant. Reliability analysis as well as availability evaluation is performed for performance evaluation of thermal power plant. Equipment maintenance data is collected from maintenance history for which the goodness of fit test viz Kolmogorov-Smirnov is conducted and parameters for the best distribution are determined. Further, reliability of subsystems at various time intervals is calculated. The Fault Tree Analysis models were developed for performance evaluation of thermal power plant. These models are employed for the subsystems of plant and furthermore availability indices are evaluated. The overall availability of 87.77% is evaluated using Fault Tree Analysis model. The comparative results are obtained from the study, which revealed that the Fault Tree Analysis model provides an availability index of the system closer to real-time data.
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    Optimization of thermal processes in solar biogas plant
    (Karaganda National Research University named after аcademician Ye.A. Buketov, 2026) Sharipov M.Z.; Majitov J.A.; Imomov Sh.J.; Kovalev I.V.; Narzullayev M.N.; Negmatillayev B.; Ziyoyev D.A.
    This article presents the results of research devoted to improving the thermal regime of a smallscale biogas plant operating under the conditions of Uzbekistan and utilizing solar energy. The study optimized the constructive and energetic parameters of a cylindrical solar-heated biogas plant. The main part of the plant is a bioreactor equipped with a solar heating system, designed for anaerobic fermentation of organic materials to produce biogas and organic fertilizer (humus). During the research, the amount of solar radiation, daily variations of ambient and bioreactor temperatures, and the dynamics of biogas production were analyzed. The results showed a stable increase in biogas production, which demonstrates the efficiency of using solar energy and highlights the importance of maintaining the optimal thermal regime of the bioreactor. Changes in the composition of biogas under mesophilic and psychrophilic regimes were also studied. The final conclusion emphasizes that temperature plays a key role in ensuring the stability of the fermentation process in small-capacity biogas plants, and that mathematical modeling of thermal processes is essential.