http://repository.enu.kz/handle/enu/19495 2026-04-03T23:18:14Z 2026-04-03T23:18:14Z Ibraev, I.K. Ibraeva, O.T. Aitkenov, N.B. Sakipov, K.E. http://repository.enu.kz/handle/enu/29142 2025-12-29T19:02:44Z 2024-01-01T00:00:00Z

USING COAL FLOTATION WASTE AS A HEAT-INSULATING BILLING FOR THE HEAD PART OF A FORGING INGOT Ibraev, I.K.; Ibraeva, O.T.; Aitkenov, N.B.; Sakipov, K.E. The experience of using coal flotation waste as a weakly exothermic insulating backfill for insulating the head part of forging dead-melted steel ingots is presented. It has been shown that when using weakly exothermic fills based on single-component fills in the form of coal flotation waste, it is possible to reduce the chemical heterogeneity of the ingot by producing a closed shrinkage cavity, which allows halving heat loss and depth of penetration of shrinkage looseness into the body of the ingot, reducing the segregation of impurities, compacting the head part of the ingot and increasing the yield; moreover, the profitable part of the ingot is more dense and less contaminated with nonmetallic inclusions. The studied patterns of the formation of a closed shrinkage cavity with a dense “bridge” in the head part of a dead-melted steel ingot made it possible to develop and implement a technology for casting large forging ingots of sufficiently high quality using weakly exothermic heat-insulating materials based on metallurgical waste (coke screenings, coal flotation waste).

2024-01-01T00:00:00Z Kangalakova, Dana Satpayeva, Zaira Nurkenova, Makpal Nyussupova, Gulnara http://repository.enu.kz/handle/enu/29141 2025-12-29T19:02:55Z 2025-01-01T00:00:00Z

Trends and research networks in greening business: A bibliometric analysis Kangalakova, Dana; Satpayeva, Zaira; Nurkenova, Makpal; Nyussupova, Gulnara Business development contributes to the sustainable economic development of the country while also leading to significant environmental changes at the global level. The greening of businesses is becoming a priority area of strategic management for companies, considering the growing environmental challenges and the need to move toward sustainable business models. This study aims to identify the historical, evolutionary, spatial, and conceptually scientific landscape of greening businesses through bibliometric analysis. The study analyzed 660 sources in the Scopus database from 1992 to 2024. The use of VOS Viewer software and the Scopus analysis tool has shown that greening business research has been of interest among many authors and is a growing trend. The rapid growth of publications from 2019 to 2024 shows its significance to many government agencies, business people, investors, and researchers. The growing number of scientific studies in economics, management, and ecology indicates a growing scientific focus on the problems of greening businesses. The United States occupies a leading position in research volume, while the United Kingdom and China emphasize their significant contribution to developing this concept. A comprehensive analysis of scientific publications identified seven key clusters reflecting the directions of modernization of environmental business. These include green technologies, green finance, and an economy focused on the environmental transformation of businesses. The dynamics of publication activity in these fields of science confirm the relevance of the concept of eco-friendly business and its significant potential for further scientific research and practical implementation.

2025-01-01T00:00:00Z Mukhamejanova, Assel Aldungarova, Aliya Alibekova, Nurgul Karaulov, Sabit Kudaibergenov, Nurlan Yespolova, Zukhra Kurmanova, Dametyk Baizakova, Gulmira Kazhimkanuly, Dias http://repository.enu.kz/handle/enu/29140 2025-12-29T19:01:28Z 2024-01-01T00:00:00Z

Toward the use of an intermediate value of the modulus of deformation of soils in geotechnical design Mukhamejanova, Assel; Aldungarova, Aliya; Alibekova, Nurgul; Karaulov, Sabit; Kudaibergenov, Nurlan; Yespolova, Zukhra; Kurmanova, Dametyk; Baizakova, Gulmira; Kazhimkanuly, Dias This study presents the results of a critical analysis of the existing methods of selecting the values of ground deformation modulus used in calculating the settlement of designed foundations. The importance of improving the reliability of the determination of the modulus of deformation for ensuring the reliability, economic efficiency and safety of structures is highlighted. It is revealed that the determination of the deformation modulus is not performed at the full depth of soil samples, which can lead to the risk of accidents at facilities. To increase the reliability of deformation modulus determination, a method of interpolation of values based on data from nearby wells is proposed. A new model for determining intermediate values of the deformation modulus is presented, which can be used in calculating the settlement of designed buildings. The results of test problems confirm the high efficiency of the proposed method not only for the calculation of foundation settlement using the values of ground deformation modulus, but also for the control determination of refined values of ground deformation modulus at the stage of geotechnical engineering surveys.

2024-01-01T00:00:00Z Akhmetbaev, D.S. Dzhandigulov, A.R. Akhmetbaev, A.D. http://repository.enu.kz/handle/enu/29139 2025-12-29T19:00:50Z 2025-01-01T00:00:00Z

The Use of Thyristor-Based Static VAR Compensators to Enhance Distribution System Security Akhmetbaev, D.S.; Dzhandigulov, A.R.; Akhmetbaev, A.D. Nowadays, FACTS devices are commonly used for voltage regulation and optimal control of operating parameters of power systems. Controllable FACTS devices relying on power electronics can be used to obtain the required characteristic curve not only for power transmission lines, but also for a specific part of the electrical system. This paper reports the results of a study on operating conditions of a realworld distribution system that has a static thyristorbased VAR compensator (SVC) installed to enhance its security. The efficiency of distribution systems and available ranges of their operating conditions largely depend on the placement of compensation devices and the rules governing their capacity. We propose a consistent approach based on graph theory methods to address this issue. The approach involves examining the conditions for nodal voltage stabilization to reduce the total active power loss in the electrical network. The ranges of variation in SVC capacity are identified and appropriate SVC control rules required to ensure the lowest possible total power loss in the network are established.

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