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Бюллетень науки и практики @bulletennauki
Статьи журнала - Бюллетень науки и практики
Все статьи: 7297
Статья научная
The article presents the research results on the microbiological activity of some Passiflora genus species, first introduced in Azerbaijan. Phytochemical compounds were analyzed in vitro in ethanolic extracts of Passiflora incarnata L. , P. edulis Sims, P. caerulea L. leaves and fruits to determine the antimicrobial activity against six pathogenic bacteria. The activity indicators of ethanolic extracts from leaves and fruits of all three species were compared. Leaf extracts were found to have higher antibacterial activity compared to fruit extracts. Ethanolic extracts of Passiflora edulis Sims were more active than extracts from P. incarnata L. and P. caerulea L. The results of the study may contribute to the development of new medications against pathogenic microbes and the progress of the pharmaceutical industry in the future.
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Developing creativity in primary school students through problem-based learning
Статья научная
Creativity is a crucial skill for the 21st century, especially for young learners in primary education. Problem-Based Learning (PBL) has emerged as an effective pedagogical approach to fostering creativity by engaging students in real-world problems and encouraging critical thinking. This paper explores the theoretical foundations of PBL and its role in developing creativity in primary school students. The study examines historical perspectives, provides definitions of key terms, and reviews scientific perspectives on creativity development. Additionally, the research outlines methodologies, discusses results, and presents conclusions on the effectiveness of PBL in enhancing creative thinking among young learners.
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Developing critical thinking through English language teaching
Статья научная
In today’s globalized and rapidly changing world, the ability to think critically is a vital skill for learners in all disciplines, especially in language education. This article explores the integration of critical thinking development into English language teaching (ELT), emphasizing how English classrooms can serve as a platform for fostering analytical, evaluative, and reflective thinking skills. By examining theoretical frameworks, practical methods, and classroom strategies, the article offers insight into how critical thinking can be promoted alongside linguistic competence. The paper concludes with recommendations for educators and implications for curriculum development.
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Статья научная
This study aims to develop methodologies for assessing the return on investment (ROI) of digital projects, crucial for understanding the economic impact of digital innovations on enterprises. Traditional ROI metrics often fail to capture the comprehensive value generated by digital projects. The proposed integrative framework employs advanced analytical methods, including cost-benefit analysis, real options analysis, and predictive analytics, to evaluate both tangible and intangible benefits. It incorporates dynamic risk management and scenario planning to address uncertainties and future challenges. Continuous feedback and iterative improvements ensure the framework's accuracy and relevance, enabling enterprises to optimize economic efficiency and strategic decision-making. This holistic approach offers an understanding of the multifaceted value of digital innovations.
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Developing of management: choice and implementation of new tools
Статья научная
The research presented in this article shows the experience of implementing new Managerial tools in context of management and employees’ development which is carried out in the large vehicle manufacturing company GM Uzbekistan. The paper describes the details of some new management techniques implementation and evaluated the results of implementation. Analysis of the results of innovation activity, questionnaire survey and special interview reveals of main influenced factors. Result of the research illustrates the importance of in-company culture and managerial style, empowerment and involvement of personnel, top management support and managerial stress, education and training programs. The management of the JVC General Motors Uzbekistan has actively tried to induce new managerial tools and techniques as Continuous Improvement activity through Employee’s Suggestion System, Quality circle, 5S, TPM and others and MBO - Management by Objectives as tools for activation personnel potential and establishing self-managed teams within company employees...
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Статья научная
The research works were carried out in the years 2021-2023 in farms located in the Guba district of Azerbaijan (41°04ʹ27ʺ N 48°36ʹ32ʺ E). During the research, as the apple fruit eater hibernates both in the caterpillar and pupal stages, their coming out of hibernation in the spring season of the next year coincides with different times. It is for this reason that this pest can be found in agrocenosis from spring to autumn. Because the development of generations is mixed together and creates a complex phenological calendar. Apple fruit borer produce 2 complete generations in the study areas. The third generation hibernates in different stages (caterpillar and pupa).
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Статья научная
He results of studies conducted in 2022-2023 are reflected. Periods of activity of Eurygaster integriceps , a serious pest of grain farming in the Shamkir district, have been identified. This is one of the main grain regions of Azerbaijan. The studied species, when present in high numbers, causes serious damage to grain farms. It has been established that the pest under these conditions produces one full generation and is more active in the agrocenosis from May to June. A phenological calendar is presented, which can be used in the development of planned measures for protection against this pest.
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Development of Beta zeolite template free synthesis method
Статья научная
The development of new methods for the synthesis of zeolites and the improvement of existing methods for the synthesis of zeolites in order to reduce their cost and improve the quality of the final product is an important task of modern chemistry and chemical technology. Existing methods for the synthesis of zeolites, including hydrothermal synthesis methods, are extremely time-consuming and expensive due to the widespread use of structure-forming agents. At the same time, traditional methods for solving the above problems by increasing the rate of hydrothermal synthesis by increasing the temperature are not optimal, due to the possibility of the formation of additional inorganic phases at high temperatures. Zeolite BETA is one of the most commonly used aluminosilicates both as a catalyst and as a material for creating inorganic membranes for various purposes, while the synthesis of the above zeolite is extremely long and takes from 5 to 10 days. The presented article presents the results of the development of a method for obtaining BETA zeolite by a hydrothermal method under the influence of ultrasound. A study of the influence of temperature and the ratio of silicon to aluminum in the reaction medium on the yield of zeolite is also given. It has been established that an increase in the temperature of hydrothermal synthesis from 80° C to 120 °C contributes to an increase in the yield of zeolite up to 97%. An increase in the molar ratio of silicon to aluminum, on the contrary, leads to a decrease in the zeolite yield to 15%. It is shown that the synthesis under conditions of ultrasonic treatment with a power of 6 mW/cm2 contributes to an increase in the yield of the target product by 2-4 times, and an increase in the rate of formation of BETA zeolite by 2-8 times.
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Development of a hydraulic damping device to protect a centrifugal pump
Статья научная
This study focuses on the utilization of hydraulic accumulators to mitigate hydraulic shock. The pressure energy within the system is converted into compressed gas energy in the accumulator. This continuous conversion between the two forms of energy allows for the absorption of hydraulic shock force, thereby ensuring system stability. The study involved the creation of experimental circuits, which were tested both with and without the inclusion of a hydraulic accumulator. The results confirmed that the accumulator has a substantial impact on reducing hydraulic shock phenomena. The study's findings demonstrate that the shocks in the hydraulic system can be efficiently managed by selecting an appropriate inflation pressure for the accumulator and utilizing various connection line data.
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Development of a model for the analysis of the socio-economic security of a complex system
Статья научная
The effectiveness of the use of mathematical methods of data analysis to the results of experimental studies is justified by a formalized representation of the quality of the objects of the studied array in numerical format. At the same time, depending on the individuality of the field of study there is an opportunity to meet a number of problems. As a rule, the socio-economic area of the probabilities of formalization of the quality of the objects is located at the stage between difficult and easy) formalization. The difficulty of formalization, first of all, is that it is impossible not to take into account the social component in the formal description of social and economic systems. But if earlier the formalization of the social element in principle was not likely due to the undeveloped apparatus, then it was not remembered. All modelling was limited to the analogy with technical systems or statistical data processing. However, at the moment on the basis of interdisciplinary approaches there is a real probability to address the formalization of society - a difficult field of study.
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Development of a prototype hydraulic damping device for hot water heating circuit in pulse mode
Статья научная
This paper provides a comprehensive exploration into the design and implementation of the hydraulic damping device within a pulse mode hot water heating loop. It outlines a systematic approach aimed at optimizing system performance, detailing the operational principles of the pulse mode heating circuit and presenting a structured construction scheme for the hydraulic damping apparatus. Accompanying this analysis is a simplified diagram illustrating the hydraulic damping system, offering a clear visual representation of its integration within the heating circuit. Through mathematical transformations, essential parameters such as complex impedance, frequency function, and vibration frequency characteristics are derived, providing valuable insights into the dynamic behavior of the system. Culminating this investigation, the paper constructs the frequency response of the circuit, offering a comprehensive understanding of its dynamic behavior across varying frequencies. This synthesis of theoretical frameworks and practical applications advances our understanding of pulse mode hot water heating technology, paving the way for enhanced efficiency and performance in heating systems.
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Development of a prototype non-volatile heating circuit with pulsating mode
Статья научная
The emergence of global energy crisis makes energy saving technology become the key technology of sustainable development. Enhanced heat transfer technology can improve the efficiency of various heat transfer equipment and reduce the weight and volume, which plays a vital role in energy saving and sustainable economic development. In recent years, based on theoretical and experimental research, Chinese researchers and technicians have developed many new technologies to strengthen heat transfer, such as cross-scaled elliptic tube, discontinuous double-inclined inner rib tube, spiral groove tube, spiral groove tube, inner fin tube, twisted elliptic tube and so on. Among them, the pulsating heat transfer technology is an efficient and energy-saving means that can significantly strengthen the convective transport operation and improve the heat transfer effect. Through fluid pulsation or the vibration of the heat transfer pipe, the technology can remove the dirt deposited on the heat exchange surface, reduce the thermal resistance of the dirt, and improve the performance and life of the heat exchanger. It is widely used in the cooling of electronic components, automobile turbines, and the utilization of atomic energy in Marine environment. Firstly, the construction scheme of the experimental device is proposed, and the working principle of the experimental device is described in detail. The complex impedance, frequency function, amplitude-frequency characteristic and phase-frequency characteristic are obtained by mathematical transformation of power supply circuit. Finally, the frequency response of the circuit is constructed.
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Development of automobile industry and business in Uzbekistan
Статья научная
In this paper looked through several aspects of the sustainable development of the automotive business and industry in Uzbekistan. We analyzed the legal and regulatory framework, directed investment target program for the development of the automotive business, the main socio-economic indicators and the results of the JSC “Uzavtosanoat”, which is the top of the organization and the main coordinator of the sector in Uzbekistan. In the process, information obtained that year by year, an increasing number of localized sets of component, parts for cars, trucks and agricultural machinery. In addition, in 2015, because of 8 AK “Uzavtosanoat” system projects in the republic created 220 new jobs and spent more than 42 billion soums of domestic investment. As results of 6 foreign direct investment projects assimilated more than 7 million US dollars and created over 100 new jobs in the system of JSC “Uzavtosanoat”. In 2013-2015 years increased production of trucks and heavy machinery was almost 270 percent, batteries 126.7 percent, in turn decreased the production of passenger cars by 25 percent, 68 per cent of the buses. This data indicates that gradual changes in the world and in the internal conditions of vehicles market is saturated domestic market of buses and cars. Increased domestic demand for trucks due to the prosperity of various types of civil and housing construction in the country, a gradual upgrade of Trucks Park in the enterprises, the acquisition of new trucks and special vehicles from the side of small business and private entrepreneurship.
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Development of effective forms of the entrepreneurship on the silkworm seed system
Статья научная
The article describes the role and importance of sericulture in the national economy, as well as the stages of the development of greening production. The proposals and recommendations on the organization of an effective form of entrepreneurship in the delivery of green to subjects involved in breeding silkworms are given. A scheme showing the steps of operation. It is recommended to study the experience of foreign countries in reproduction and distribution of silkworm seeds, and then they can be used in our republic. Particular attention should be paid to work experience in India. The Republic of India is the second largest silkworm seed and cocoon cultivator, but it is the world’s leading producer of raw silk. The Indian government is paying more attention to public-private partnerships for the production of silkworm seeds. That is, the production of silkworm seeds is based on the specific requirements of the state, so the government will make silkworm seeds at the expense of the lowest costs.
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Development of light industry branches in Uzbekistan based on vertical integration
Статья научная
The textile industry takes leading positions in the economy of the Republic of Uzbekistan with sufficient raw material and qualified personnel and labour power. This network is developing rapidly, especially on the basis of the right policy pursued by the government. Cotton fibre grown in the country as the main raw material for the textile industry is important in this regard. The analysis shows that, while world-class scientists have discovered several different chemical fibres, cotton fibre is one of the world’s leading natural resources and the demand for it is constantly increasing. In this sense, it is necessary to use the existing opportunities, apply new management methods, introduce modern standards and methods of corporate governance, and strengthen the role of shareholders in strategic management of enterprises.This article analyzes the growth of the volume of production of light industry sectors in the development of the economy of the Republic of Uzbekistan, and the author has developed a multidimensional forecast for the production of light industry products. My idea of the author, it is necessary to fully coordinate the production of light industry enterprises in the context of Uzbekistan in the context of the competitive environment in the market and to examine the factors of their socioeconomic efficiency by utilizing modern strategies based on the improvement of vertical integration.
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Development of off-farm employment in rural environment: trends and directions
Статья научная
The article is devoted to the development off-farm employment such as storage, processing and marketing of agricultural products, rural trade, agrotourism, folk crafts, domestic and socio-cultural services for the rural population, harvesting and processing of wild fruits and berries and etc. in the rural environment.
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Development of regional economy with mountain recreation: in case Uzbekistan
Статья научная
This article explores the issues of further development of the regional economy of Uzbekistan on the basis of mountain recreation. The author revealed that the development of this industry is influenced by such factors as the specialization of the region, the economic efficiency of the services sector, the development of recreational regions, etc. During the transition to market relations in many countries, the main problem was the competitiveness of recreational resources.
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Статья научная
The main activities of leading foreign companies are currently the development and production of agricultural machinery, taking into account new legislative requirements both for agricultural production in general and directly for the machinery itself. There is a clear trend towards the widest use of modern computer and information technologies in the design of agricultural machines, which allows to increase productivity and quality of technological operations while reducing operating costs, as well as improve working conditions of employees, management and control of work performed. Intensive resource conservation technologies are technologies related to the introduction of the latest high-performance combines, tractors and a plume of wide-range or combined agricultural units. The next type of resource conservation technologies is based on knowledge and respect for the laws of nature. These are resource conservation technologies through the biologization of agriculture. Resource conservation activities in crop production are based on the complete restoration of land fertility after the removal of nutrients from the soil by agricultural crops. This is ensured by the integrated application of organic and inorganic fertilizers, green manure, bacterial fertilizers, as well as peat and sapropel. All crop production technologies should be resource conservation, environmentally balanced, and have a pronounced zonal character. Moisture conservation technologies in crop production have great prospects due to the development of new crop rotations with an expanded set of crops.
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Статья научная
Among the sucking pests of sugar beet crops in Azerbaijan, black bean aphid (Aphis fabae Scop.), which occurs on beet seedlings from the moment of development of true leaves, causes significant damage. Based on this, the task of our study was to study the main life processes of beet aphids depending on photoperiodic conditions. The work was carried out in the Laboratory of Ecology and Physiology of Insects and the Center for Applied Zoology of Azerbaijan National Academy of Science in 2013-2019. The experiments were carried out in special photo thermostats with automatic control of temperature and light. The results obtained show that the light factor is of secondary importance for the duration of the larval, reproductive periods and for the entire development cycle compared to temperature. It should be noted that winged forms (about 50%) appear in aphid colonies during a 12-hour photoperiod at a temperature of 17 °C. Under the conditions of Azerbaijan, such photoperiod is observed at the end of March and at the beginning of October, when aphids migrate from primary to intermediate plants and vice versa in autumn (early October) from intermediate to primary. The length of the day established in the experiments, which causes the appearance of winged forms, is consistent with the phenology of this species.
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Статья научная
The hot water supply system is one of the important components of the water supply and drainage system of high-rise civil buildings. With the development of the national economy and the improvement of people’s living standards, people’s requirements for popularizing hot water supply and improving hot water supply technology are becoming more and more urgent. In the process of hot water supply, the flow pressure of the pipeline is increased, and the purpose of hot water supply in high-rise buildings is achieved. The experiment analyzes the effect of the pressure ratio on the pipeline in front of the accumulator and the impact valve on the flow of coolant through the check valve. First, through the periodic opening and closing of the shock valve, the pressure continues to rise and fall, and the spring hose exhibits periodic pulsation. The effects of different pressure ratios on pipeline pressure and flow rate are studied, and the data of simulation calculation and actual measurement are analyzed through experiments. The research results have practical significance for improving the water supply efficiency of the hot water supply system of high-rise buildings.
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