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Статьи журнала - Бюллетень науки и практики
Все статьи: 6181
Design of dangerous driving behavior detection system based on STM32
Статья научная
With the rapid development of China’s economy and the continuous improvement of the living standards of the people, cars have gradually become an indispensable tool for travel. At the same time as the number of cars increases rapidly, the accident rate of road traffic is also increasing. Traffic accidents caused by dangerous driving behavior account for a large part of the accident rate. In order to reduce the road traffic accident rate, a vehicle dangerous driving behavior detection system using STM32 single-chip microcomputer is designed from the vehicle itself, which mainly detects the speed and weight of the vehicle. When the vehicle is in the starting state, the detection system detects the weight and speed of the vehicle in real time through the sensor and the motor speed. In this system, the STM32 is used as a core MCU. When the speed or weight of the vehicle exceeds the threshold, the MCU performs an alarm and subsequent operations. This design introduces the overall design of the system in detail, from the test of each module to the use of the overall connection test, the interface module and STM32 interface circuit as well as the system hardware circuit and related peripheral circuits are given, and finally the measurement data is displayed through the OLED. The design is simple in structure and can be applied to various vehicles.
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Design of fishing vessel lighting system based on force-controlled wind-solar complementarity
Статья научная
This paper focuses on the lighting system of fishing vessels, and the emergence of histograms has brought a new vitality to the development of the lighting of fishing vessels. In this paper, after summarizing the knowledge of wind and solar complementary technology, combined with the design needs to use the configuration control of each part of the control function to put forward a series of control schemes. Explains the background of the project development and its importance and introduces the key technical situation of the wind and light photoelectric complementary and the use of solar wind energy in the ship. Master the wind and solar complementary technology overview and summarized the independent wind power generation system and independent photovoltaic power generation system technology as well as the characteristics and working principle of wind and solar complementary power generation. Obtain the specific parameters of each component, including marine lighting parameters, wind turbine parameters, photovoltaic solar panel power generation parameters, in order to prepare for the simulation afterwards. Software base before simulation, simulation according to the requirements of the design, including the design of wind turbine, photovoltaic solar panels, the design of the fishing boat lighting load, and finally the results of the simulation are analyzed as well as the conclusion.
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Design of heat pipe air preheater for 10 t/h gas-steam boiler
Статья научная
This design is aimed at energy -saving and designed a heat pipe air preheat to recover 10 t/h steam gas boiler flue heat waste heat, thereby increasing the efficiency of the boiler and reducing gas consumption. This article first introduces the thermal pipe, heat pipe heat exchange, and boiler thermal system, and then focus on the design and optimization of the heat pipe air heater. This design optimizes the thermal pipe specifications of the heat pipe air heater and the parameters of the fins. At the same time, the sealing structure, the fixed structure, and the airport structure are optimized. Subsequently, the UG software created a three-dimensional physical model model and rendering model, and finally proposed corresponding countermeasures on equipment corrosion, thermal pipe life and tube vibration problems. This design uses Excel software to make design calculation tables. Through input parameters, the results of the results of the number of thermal pipes can be obtained.
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Design of metal sulfide electrode for hydrogen production by electrolysis
Статья научная
Hydrogen evolution reaction (HER) is the cathodic hydrogen evolution reaction in electrolytic cell, but the hydrogen evolution catalytic properties of electrode materials best remains is the precious metal catalyst, therefore, in order to study the catalytic performance is good, and cheap hydrogen evolution electrode materials has become the research hot spot, metal sulfide can be mixed and with good electrical conductivity is it can be used as a necessary condition for hydrogen evolution electrode, The core theory of this paper is the first principle. By taking metal sulfide as the matrix and doping it with 10 metal group elements, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn, we obtained the configuration of 20 metal sulfide by doping it at two different sites of S atom, and inlaid H atom into metal atom. Then, through the use of software to study its catalytic performance, through the free energy analysis, rate analysis, bond length analysis, density of states analysis, charge analysis method, compared and found the most suitable doping metal element V, thus also determined that metal sulfide can be used as hydrogen evolution electrode through metal doping.
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Статья научная
As a new type of heat exchanger with compact structure and efficient performance, microchannel heat exchangers have good application prospects in industries with strict requirements such as energy and power, petrochemical, aerospace, and other industries. Therefore, exploring the performance and heat transfer characteristics of microchannel heat exchangers is of great significance. This article designs a performance testing system that can simultaneously explore the enhanced heat transfer inside the pipeline of water water and carbon dioxide compressed air microchannel heat exchangers. The variable working fluid circuit design is used to analyze the factors that affect the enhanced heat transfer. The Control variates is used to control the heat transfer conditions, explore the difference of heat transfer performance between different working fluids under different flow rates, inlet temperatures and other conditions, and analyze the heat transfer performance of different channel types by comparison method. The results indicate that when the hot water flow rate range is 2.063×10-5~2.556×10-5m3/s, Re-5~2.556 ×10-5m3/s, the Reynolds number and Nusselt number in the pipeline increase with the increase of inlet flow. In the carbon dioxide compressed air heat transfer experiment, when the flow rate range is 2.810×10-4~3.182×10-4m3/s, the Nusselt number and convective heat transfer coefficient of the 3.6mm inner diameter microchannel are always greater than the Nusselt number and convective heat transfer coefficient of 6.6mm. When the pipe diameter is the same, the water water microchannel heat exchanger has better heat transfer performance and smaller pressure drop compared to the carbon dioxide compressed air microchannel heat exchanger.
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Designing a cooler with natural cold for a 100 kW semiconductor power converter
Статья научная
The subject of the study is the design of a cooler with natural cooling capacity for a 100 kW semiconductor power converter. The purpose of this thesis is to design a cooler with natural cooling capability for a 100 kW semiconductor power converter and to evaluate its practical effects. We summarize the demand for power semiconductor devices for new applications in power electronics in recent years. During the study and testing of the cooler for the 100 kW semiconductor power converter, the parameters that became the basis for mathematical modeling were determined. In this paper, we summarize the key issues and the current state of research on power semiconductor modules, including module thermal design and thermal modeling issues. The degree of realization is complete. In the process of developing the experimental device, reduction of energy consumption losses and reduction of explosion and fire hazards in industrial production facilities was achieved, which in turn will increase the efficiency of the invention and reduce its production costs. Development of efficiency - reduction of power consumption losses, reduction of explosion and fire hazards in industrial production facilities due to overheating of power semiconductors.
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Статья научная
As in the Republic of Azerbaijan, appropriate measures are being taken in the Guba district in the field of environmental policy, environmental security, and efficient use of natural resources that meet the needs of society and require environmental protection in order to achieve sustainable socio-economic development. Therefore, the interaction of society with nature, the optimization of the impact of these relations, and the search for solutions are considered as one of the important issues. In this case, the main attention should be paid to the organization of the designing the industrial zones Phin the Guba district. Because the correct designing of industrial zones helps to organize work, protect the environment, and achieve sustainable socio-economic benefits. The article presented as a result of research in this area examines the volume of industrial products produced in the Guba district, the retail trade turnover of local production and export products, design of industrial zones, and environmental problems during production.
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Designing of a cavitation heat generator for heating water with a capacity of 10 kW
Статья научная
This article establishes a three-dimensional model of the design circuit of a water heating cavitation device and simulates it in Hysys software. The relationship between temperature, pressure and flow rate of cavitation generator in pulsed heating water circulation unit is studied by using control variables. The dependence of pressure and temperature difference on flow rate was studied. The dependence of pressure and temperature difference on the thermal power of the cavitation device was studied. The dependence of pressure and temperature differences on pipeline diameter was investigated. Explored the differences in pressure and temperature through water flow methods in pulse and stationary modes. The following conclusions can be drawn: 1) When the flow rate and output thermal power remain constant, the pipe diameter is inversely proportional to the pressure; 2) When the pipe diameter and output thermal power remain constant, the flow rate is proportional to the pressure; 3) When the total output power is 10 kW, the outlet temperature of the system gradually rises to a relatively stable state after 1000 seconds for different power cavitator schemes; 4) When the total output power is basically equal, the more times the parallel connection is made, the smaller the voltage drop, and the higher the system efficiency; 5) When the pipe diameter and output heat power are constant, the larger the flow rate, the smaller the temperature after the cavitator and the temperature difference between the front and back become smaller. When the pipe diameter and flow rate are constant, the smaller the output thermal power, the smaller the temperature after the cavitator and the temperature difference between the front and back become smaller.
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Designing of a liquid cooler with a phase transition with a power of 5 kW
Статья научная
A diagram and installation of a prototype of a two-flow heat pipe with the ability to regulate the parameters of the working environment have been developed. The installation allows the heat pipe to operate in both normal and pulsed cooling modes. Data were obtained that made it possible to obtain the dependence of the heat transfer coefficient on the heater power, and the heat transfer coefficients in stationary and pulsed modes were determined. In this article, the Aspen Hysys software package is selected as the software and circuit simulation. As a result of theoretical studies, it was established that the heat transfer coefficient of a heat pipe in pulsed mode is 12% higher than in stationary mode with the same initial coolant parameters. Based on the results of the work, it is proposed to use the method of pulsed supply of liquid coolant as one of the ways to increase the heat transfer of a heat pipe.
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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 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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