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Готові списки джерел за темами / Coefficient of unevenness of tourist flow / Статті в журналах

Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: Coefficient of unevenness of tourist flow.

Статті в журналах з теми "Coefficient of unevenness of tourist flow"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

Starkova, N., and M. Prilyubchenko. "Methodical tools of assessment of level of influence of tourism for national economy." Bulletin of Science and Practice, no. 11 (November 14, 2017): 327–37. https://doi.org/10.5281/zenodo.1048507.

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The basic concepts defining the character of the economic relations of subjects of tourist branch are given. According to the data of the World Trade Organization is established the growth of world tourist branch. It is confirmed that this tendency is characteristic also of the Russian Federation. However in our country uniform approach to modelling of the effective mechanism of functioning and development of national tourist branch isn't created yet. The major factors influencing the development of tourism in the Russian Federation are considered, indicators of their assessment are offered. T

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2

Yuan, Zhouhao, Yicheng Ye, Binyu Luo, and Yang Liu. "A New Characterization Method for Rock Joint Roughness Considering the Mechanical Contribution of Each Asperity Order." Applied Sciences 11, no. 15 (2021): 6734. http://dx.doi.org/10.3390/app11156734.

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The morphology of the joint surface is multi-scale, and it can be divided into first-order asperity (waviness) and second-order asperity (unevenness). At present, the joint roughness characterization formula considers only the morphology contribution of waviness and unevenness components and does not fully consider their mechanical contribution. At same time, the relationship between the mechanical contribution and the morphology contribution is still unclear. Thus, the characterization formula considering the mechanical contribution of waviness and unevenness needs to be further studied. In t

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3

Jiang, Qing, Ye Zhang, Shiyou Yan, and Liangyuan Xu. "Optimal Design of an Angular Box for a Mixed Flow Grain Dryer." Applied Engineering in Agriculture 37, no. 4 (2021): 555–62. http://dx.doi.org/10.13031/aea.14643.

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Highlights The drying effect in the drying layer is affected by the status of the flow field. The angular box of the drying oven is optimized to improve the drying effect. The structure of the variable-section angular box significantly reduced unevenness and improved the drying effect. Abstract . Dryers are subject to problems as they are unable to fully and uniformly dry grain. Considering the mixed-flow drying process and improving the drying uniformity, this study conducted a numerical simulation of the hot air temperature field, velocity field, and pressure field with ordinary equal cross-

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4

Aleksandrovna Volkova, Tatiana, Mikhail Yuryevich Belikov, Alexander Aleksandrovich Mishchenko, Vera Vladimirovna Minenkova, and Anatoly Anatolyevich Filobok. "Beaches of the Black and Azov Seas in the Modern Russian Tourism Industry Structure: Current State and Development Prospects." International Journal of Engineering & Technology 7, no. 4.38 (2018): 646. http://dx.doi.org/10.14419/ijet.v7i4.38.24639.

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The state of the tourism industry reflects the level of the tourism development on a certain territory. Over the recent years the tourism industry of the Russian Federation has changed considerably. The Krasnodar Territory as one of the leading tourist regions of the country has general national trends, too. The number of holidaymakers at the Azov-Black Sea coast resorts has grown. Territorial development of the tourist and recreational complex of the Azov-Black Sea coast is characterized by unevenness: a great flow of tourists come to rest on beaches of the Black Sea of the Krasnodar Territor

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5

Shang, Wei, and Guo Chuangle. "Study on Regional Control of Tourism Flow Based on Fuzzy Theory." Wireless Communications and Mobile Computing 2021 (August 19, 2021): 1–7. http://dx.doi.org/10.1155/2021/9648879.

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In order to solve the problems of poor regional control effect and high control difficulty coefficient of a traditional tourism flow, this paper puts forward the research of a regional control of tourism flow based on fuzzy theory. The capacity of regional tourism is determined by analyzing the factors that influence the regional control of the tourism flow. The regional tourism flow is divided into different time series by automatic clustering algorithm, the same sample data is fused, and the Euclidean distance between traffic is obtained. The regional tourism flow prediction model is constru

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6

Han, Zhiqiang, Gang Xie, Yongjun Zhou, Yajuan Zhuo, Yelu Wang, and Lin Shen. "Dynamic Response Analysis of Long-Span Bridges under Random Traffic Flow Based on Sieving Method." Buildings 13, no. 9 (2023): 2389. http://dx.doi.org/10.3390/buildings13092389.

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To overcome the limitations of using time interval division to calculate the bridge impact coefficient (IM), a sieving method has been proposed. This method employs multiple sieves on bridge time–history curve samples to ultimately obtain the bridge impact coefficients. Firstly, CA cellular automata are used to establish different levels of traffic flow fleet models. The random traffic flow–bridge coupling dynamic model is established through wheel–bridge displacement coordination and mechanical coupling relationships based on the theory of modal synthesis. Then, the variation of bridge dynami

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7

Kravchuk, O. "TO THE HYDRAULIC CALCULATION OF PRESSURE DRAINAGE PIPELINES, OPERATING IN DISTRIBUTION REGIME." Municipal economy of cities 3, no. 163 (2021): 68–74. http://dx.doi.org/10.33042/2522-1809-2021-3-163-68-74.

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A system of two differential equations which describes the movement of fluid in a pipe with a variable flow rate and the conditions for the fluid outflow through the walls of drainage pipelines into the surrounding soil is considered. It is reasoned that the second term in the original equation, which takes into account energy losses associated with a flow rate variation along the length, can be neglected without a substantial error. The considered system is reduced to dimensionless form by introducing original variables. The coefficient of collecting drainage pipeline resistance «ζl» and the

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8

Sulaiman, Ali, Bilal Mingazov, Yury Aleksandrov, and The Nguyen. "THE INFLUENCE OF OPERATIONAL AND STRUCTURAL PARAMETERS ON THE UNEVENNESS OF THE TEMPERATURE FIELD AT THE OUTLET OF THE GAS TURBINE COMBUSTION CHAMBER." Perm National Research Polytechnic University Aerospace Engineering Bulletin, no. 60 (2020): 80–87. http://dx.doi.org/10.15593/2224-9982/2020.60.09.

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Ensuring acceptable temperature field non-uniformity at the outlet of the combustion chamber is a very important requirement that determines the reliability and durability of the turbine. The formation of non-uniformity is determined by the nature of the interaction of the secondary air jets with the gas flow in the flame tube and depends on many factors, both structural and operational parameters. In this paper, we propose to evaluate the non-uniformity of the temperature fields at the outlet of the combustion chamber using a mixing coefficient that determines the quality of mixing jets of se

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9

Osypov, Ihor. "Substantiation of the Type of Air Switchgear of Pneumomechanical Seed Drills." National Interagency Scientific and Technical Collection of Works. Design, Production and Exploitation of Agricultural Machines, no. 50 (2020): 97–107. http://dx.doi.org/10.32515/2414-3820.2020.50.97-107.

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Fulfillment of requirements of agrotechnics on uniformity of distribution of seeds on the area of feeding completely depends on the correct choice of a design of sowing system. Promising development of designs of row seeders is the use of pneumatic sowing systems, which is a prerequisite for increasing productivity and reducing direct costs during sowing. But, in some cases, such a technical solution leads to an increase in metal consumption of drills, complicates their maintenance. The costs of production and operation of such drills become unjustified. Various types of air switchgears are us

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10

Guo, Fengqi, Chenjia Li, Qiaoyun Liao, Yongfeng Yan, Changxing Wu, and Liqiang Jiang. "Evaluation of the Dynamic Amplification Factors of a Monorail Tourism Transit System Based on Probability Statistics." Mathematics 12, no. 8 (2024): 1221. http://dx.doi.org/10.3390/math12081221.

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The straddle monorail tourist transportation system (MTTS) has developed rapidly in recent years, and its structure is an elevated steel structure with a beam–column system, and the design is executed according to the Safety Code for Large Amusement Rides (GB 8408-2018). However, the impact coefficient value of this code is deemed partially unreasonable. Based on this, relying on the Seven Colors Yunnan Happy World project, the dynamic response test is carried out; using the finite element (FEM) software ANSYS (2021) and multibody dynamics (MBD) software SIMPACK (2021x) combined with the monor

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11

Petrevska, Biljana. "Effects of Tourism Seasonality at Local Level." Annals of the Alexandru Ioan Cuza University - Economics 62, no. 2 (2015): 242–51. http://dx.doi.org/10.1515/aicue-2015-0016.

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AbstractThe paper underlines the importance of identifying seasonality effects over tourism development. The study applies a simple test for examining the presence of seasonality in tourism demand in the line of exploring its concentration and strength at local level. The investigation is covered by calculating some commonly applied indicators for measuring tourism seasonality, like Gini coefficient, Seasonality Indicator and Coefficient of Variation. The data set addresses the total tourist arrivals between 2000-2013 and elaborates the case of Ohrid, as the most famous tourist destination in

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12

Zaburaeva, Khava. "Recreational networks of the North-Eastern Caucasus." Science in the South of Russia 20, no. 4 (2024): 70. https://doi.org/10.7868/s25000640240410.

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In the context of global challenges and threats to the health of mankind, the assessment of recreational facilities provision, their resource base equipment and functioning efficiency becomes more and more significant. The aim of this work is to study the current structure and spatial organization of recreational networks in the North-Eastern Caucasus. Methods of the article: analysis and synthesis, statistical, comparative-geographical, historical and cartographic. On the basis of analysis and synthesis of literature sources it is shown that significant medical and recreational and tourist-re

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13

Шерешева, Марина, and Marina Sheresheva. "EVENT TOURISM AND INTANGIBLE CULTURAL HERITAGE (THE CASE OF VLADIMIR REGION)." Service & Tourism: Current Challenges 10, no. 3 (2016): 41–49. http://dx.doi.org/10.12737/21099.

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Differences in national cultures and unique cultural heritage are among the main drivers of international tourism de- velopment. There is faster growth and more noticeable specialization in this segment of the tourism market. In recent years, there is increased attention to the role of event tourism as an efficient way to engage elements of intangible cultural heritage to the organization of travelers’ leisure, and thus to increase tourist flows while minimizing damage to the environment and the material cultural heritage. The article presents the results of a study conducted in Vladimir regio

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14

Kravchuk, O. A. "PARTICULARITIES OF HYDRAULIC CALCULATION OF COLLECTING PREASSURE DRAINAGE PIPELINES." Bulletin of Odessa State Academy of Civil Engineering and Architecture, no. 83 (June 4, 2021): 130–38. http://dx.doi.org/10.31650/2415-377x-2021-83-130-138.

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Анотація:

A system of two differential equations, which describes the fluid motion in a pipe with a variable flow rate and the conditions for fluid entry through the drainage pipelines walls from the surrounding soil, is considered. It is shown that for the studied case the second term in the original equation can be neglected without a significant error. The system is reduced to a dimensionless form by introducing the original variables. The solution of this equations system is given in a dimensionless form. Two main parameters are used in the analysis: the coefficient of collecting drainage pipeline r

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15

Liu, Bin, Xingyuan Huang, Xiaohui Zhang, Shaoyi Ren, Qiang Lan, and Cheng Luo. "Numerical and Experimental Studies on the Improvement of Gas Chamber Structure during Gas-Assisted Extrusion." Polymers 14, no. 23 (2022): 5272. http://dx.doi.org/10.3390/polym14235272.

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In the gas-assisted extrusion process, the melt inside the die is in a low-viscosity molten state, so the flow field of the gas cushion layer has a great effect on the cross-sectional shape of the micro-tube. Therefore, this study establishes the gas distribution chamber model of the gas-assisted die. Ansys Fluent software was used to simulate the gas flow field of the gas distribution chamber. The effect of the gas chamber structure on the size of the micro-tube was analyzed by the extrusion experiment. The research shows that the velocity unevenness coefficient of the gas outlet of the singl

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16

Hua, Tianhao. "Regression Forecast of Hong Kong Passenger Flow Based on Baidu Index." Highlights in Business, Economics and Management 45 (December 24, 2024): 635–43. https://doi.org/10.54097/w5xj3381.

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Accurate forecasting of tourist arrivals is crucial for rational planning and resource allocation in the urban tourism industry. In recent years, scholars have found that web search data is correlated with tourism demand, providing new opportunities for such forecasting. This study aims to improve the accuracy of forecasting Hong Kong tourist arrivals by utilizing web search data and advanced machine learning methods. First, this paper employs large-scale web crawling techniques to collect text data related to Hong Kong tourism and applies the Latent Dirichlet Allocation (LDA) model to extract

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17

Lu, Wenxing, Haidong Rui, Changyong Liang, Li Jiang, Shuping Zhao, and Keqing Li. "A Method Based on GA-CNN-LSTM for Daily Tourist Flow Prediction at Scenic Spots." Entropy 22, no. 3 (2020): 261. http://dx.doi.org/10.3390/e22030261.

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Accurate tourist flow prediction is key to ensuring the normal operation of popular scenic spots. However, one single model cannot effectively grasp the characteristics of the data and make accurate predictions because of the strong nonlinear characteristics of daily tourist flow data. Accordingly, this study predicts daily tourist flow in Huangshan Scenic Spot in China. A prediction method (GA-CNN-LSTM) which combines convolutional neural network (CNN) and long-short-term memory network (LSTM) and optimized by genetic algorithm (GA) is established. First, network search data, meteorological d

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18

Xie, Xiaowen, Haozheng Gao, Zhongze Xie, and Mingge Wu. "Effects of Dry Granulation Operating Parameters on Forming Quality." Applied Sciences 13, no. 19 (2023): 10619. http://dx.doi.org/10.3390/app131910619.

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To address the issues of the existing dry granulation process, which mostly relies on manual adjustments based on empirical experience and lacks the analysis of theoretical data, a simplified model of tablet pressing based on a modified Drucker–Prager Cap (DPC) material constitutive model was proposed to simulate and analyze the forming process of tablets, and study the impacts of the feeding speed, roller speed, friction coefficient and roller clearance on the density distribution of the pressed tablets via ABAQUS. The results show that the roller speed significantly impacts the density of ta

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19

Vasyl, Loginov, Rublov Volodymyr, and Yelansky Аlexandr. "ASSESSMENT OF THE AUTHENTICITY OF A SEMIEMPIRICAL TURBULENT COMBUSTION METHOD IN AFTERBURNER OF A GAS TURBINE ENGINE." TECHNOLOGY AUDIT AND PRODUCTION RESERVES 2, no. 1(52) (2020): 12–15. https://doi.org/10.15587/2312-8372.2020.199964.

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<em>The object of research is the working process of the afterburner of the combustion chamber of a turbojet dual-circuit engine with flow mixing. The research was aimed at developing a comprehensive methodology for calculating the afterburner-output device of a forced turbojet engine, taking into account the unevenness of the coefficient of oxygen excess and flow turbulence.</em> <em>To calculate the process of mixture formation, let’s use the model of the separate flow of the gas and liquid phases, taking into account the influence of finite transfer rates between the phases. The gas p

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20

Frolova, N. L., M. B. Kireeva, M. A. Kharlamov, T. E. Samsonov, A. L. Entin, and I. K. Lurie. "Mapping the current state and transformation of the water regime of rivers in the European territory of Russia." Geodesy and Cartography 961, no. 7 (2020): 14–26. http://dx.doi.org/10.22389/0016-7126-2020-961-7-14-26.

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Water regime of rivers is an important characteristic of the surface land waters as a natural environment component and object of economic use. The reaction of the rivers’ water regime to the climatic changes, including the case of extreme hydro-meteorological events, has not been studied carefully yet. It is necessary to adapt the water part of national economy to the current trends and characteristics of rivers’ water and ice regime. The analysis and inventory of these trends are required to make appropriate decisions. The authors present the methodology and the results of mapping the curren

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21

Zhao, Gang, Tian Qiu, and Peng Liu. "Sensitivity Analysis of Geometrical Parameters to the Flow of Pre-swirl System after Turbine Blade Fracture." Aerospace 9, no. 12 (2022): 783. http://dx.doi.org/10.3390/aerospace9120783.

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The pre-swirl stator-rotor system is a common and important structure in gas turbines, and its main function is to provide cold air to the turbine blades with a low relative total temperature. Under normal conditions, the boundaries of the system are symmetrical and there is sufficient margin for each blade. However, a fracture of turbine blades can upset this balance, resulting in potentially different cold-air conditions for each blade. Therefore, to ensure the safety of the other blades after a single-blade break, it is necessary to know the cold-air distribution law of the system after a b

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22

Zhu, Yifeng, Liping Sun, and Lifu Wan. "Computational fluid dynamics analysis for improving the uniformity of flow field in heat air drying kilns." Thermal Science, no. 00 (2024): 251. http://dx.doi.org/10.2298/tsci240408251z.

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Because the uniformity of the wind speed flow field in the hot air drying kiln directly affects the distribution of the temperature field in the kiln, to improve the uniformity of air distribution in the existing wood hot air drying kiln, CFD software was used to analyze the three-dimensional flow field of each improved scheme. A combination of visual comparison and analysis methods and data comparison and analysis methods be used, to serve as the basis for assessing the feasibility and rationality of the improvement schemes. Without adding baffle plates or altering the structure to incorporat

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23

Yuan, Yuan, Chunfu Shao, Zhichao Cao, et al. "Urban Rail Transit Passenger Flow Forecasting Method Based on the Coupling of Artificial Fish Swarm and Improved Particle Swarm Optimization Algorithms." Sustainability 11, no. 24 (2019): 7230. http://dx.doi.org/10.3390/su11247230.

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Urban rail transit passenger flow forecasting is an important basis for station design, passenger flow organization, and train operation plan optimization. In this work, we combined the artificial fish swarm and improved particle swarm optimization (AFSA-PSO) algorithms. Taking the Window of the World station of the Shenzhen Metro Line 1 as an example, subway passenger flow prediction research was carried out. The AFSA-PSO algorithm successfully preserved the fast convergence and strong traceability of the original algorithm through particle self-adjustment and dynamic weights, and it effectiv

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24

Limpinskaya, Alla A. "THE TRENDS AND GEOGRAPHY OF ORGANIZED OUTBOUND INTERNATIONAL TOURISM FROM THE PERM REGION IN THE CONTEXT OF MODERN CHALLENGES." Географический вестник = Geographical bulletin, no. 2 (2023): 122–35. http://dx.doi.org/10.17072/2079-7877-2023-2-122-135.

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The paper studies functional peculiarities of tour operators and travel agencies at the regional level and their role in the transformation of the outbound tourist flow in the context of modern political and economic challenges. The research aims to identify trends in the development of international tourism from the Perm region, to identify foreign countries of tourist interest, and to justify the choice of holiday destinations in these countries taking maximum account of the preferences of the region’s inhabitants. Based on the monitoring of international flight programs, on data obtained fr

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25

Васильев, Сергей, Sergey Vasil'ev, Иван Максимов, et al. "SUBSTANTIATION OF CONTROL PARAMETERS OF THE SUBSTRATE SURFACE OF AGROLANDSCAPE OF SLOPE LANDS." Vestnik of Kazan State Agrarian University 13, no. 1 (2018): 108–12. http://dx.doi.org/10.12737/article_5afafe45b3a5e9.59496141.

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The paper substantiates the main control parameters of the underlying surface, which significantly affect the erosion processes, for the evaluation of anti-erosion technologies and mechanization tools, used on slope agrolandscapes. When the soil is treated mechanically on the surface, microroughness remains, formed as a result of the action of the operating parts of the anti-erosion machine on the treated layer. Microroughness of the soil has a great influence on the hydrodynamic properties of the water flow: speed, motion, erosion, filtration and other processes. The known parameters for esti

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26

Brekotkina, A. D., E. Yu Semakina, P. N. Brodnev, and V. A. Chernikov. "Justification of nonstandard geometry of exhaust duct of steam turbine low pressure cylinder: case study of K-300-240-2 LMZ." Vestnik IGEU, no. 5 (December 30, 2020): 5–13. http://dx.doi.org/10.17588/2072-2672.2020.5.005-013.

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Presently the losses of kinetic energy in the exhaust duct of low-pressure cylinder are considerable, since numerous spacer bars and directing plates are located inside. A fundamentally new approach is required to design the exhaust duct of LPC without internal elements in water passage and providing the decline of losses due to improvement of the diffuser form and collapsible chamber. The flow modeling in the considered exhaust duct design was carried out by the numerical RANS method with the SST turbulence model. To validate the CFD model, the results of the previous experimental studies of

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27

Panevnyk, D. O. "Determination of the characteristics of a jet pump during its asymmetric rotation in a well." Scientific Bulletin of Ivano-Frankivsk National Technical University of Oil and Gas, no. 2(51) (December 28, 2021): 55–65. http://dx.doi.org/10.31471/1993-9965-2021-2(51)-55-65.

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The hydraulic model of low-pressure jet pump working process for conditions of its asymmetric rotation is proposed on the basis of law of conservation of liquid momentum of parallel mixed potential flows with linear distribution of tangential velocities and radial displacement relative to borehole axis. In the process of derivation of the equation of pressure characteristic of low pressure jet pump at its asymmetrical rotation in a borehole the law of conservation of flow energy in the form of Bernoulli's equation and the law of continuity conservation of mixed currents have been used. To char

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28

Badanov, K. I., R. R. Badanova, G. O. Tulendieva, and G. A. Kasymova. "Improvement wool dying processes." Journal of Almaty Technological University, no. 2 (July 3, 2023): 208–13. http://dx.doi.org/10.48184/2304-568x-2023-2-208-213.

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It is known that the dyeing process used in laboratory conditions does not allow taking into account the influence of such parameters as the flow rate of the dye solution, the density when placing the dyed fibers, etc. In this regard, the article considers the use of a plant for dyeing textile materials, including dyeing fibers weighing 1-10 grams. In this regard, the article considers the use of a plant for dyeing textile materials, including dyeing fibers weighing 1-10 grams. The influence of the speed of movement of the dyeing system in the range of 1.1 to 1.8 m/min and the weight of the fi

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29

Zhang, Longmei, Wensheng Yuan, Yugang Feng, Chengqian Jin, Gangwei Liu, and Shuangcheng Xie. "Design and experiment of spiral conveying pipe in pneumatic centralized fertilizer discharge system." PLOS One 20, no. 6 (2025): e0320126. https://doi.org/10.1371/journal.pone.0320126.

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To address the problem of poor fertilizer uniformity caused by vibration and skewing during rice transplanter operations, this study developed a pneumatic centralized spiral fertilizer discharge system. By leveraging the combined effects of high-speed swirling airflow and a spiral conveying pipe, the system generates a high-speed rotating air–fertilizer mixed flow, mitigating the negative effects of ground unevenness and machine vibration on fertilizer performance. Through multi-parameter coupled simulation experiments, the optimal working parameters for the spiral conveying pipe were identifi

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30

Wirahaji, Ida Bagus, I. Wayan Muka, and Ketut Agus Karmadi. "ANALISIS PENYEBAB KEMACETAN LALU LINTAS PADA JALAN KOLEKTOR PRIMER KABUPATEN BADUNG." Widya Teknik 19, no. 2 (2024): 60–66. http://dx.doi.org/10.32795/widyateknik.v19i2.5858.

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The development of an area can be seen in the development of its transportation system. The Canggu village area is an area experiencing rapid development which has an impact on traffic density. The Canggu highway is one of the roads that serves the tourist area corridor, with heavy traffic flow poor road geometric conditions, and side obstacles that reduce road capacity. The purpose of this research is to analyze the perceptions of people who live along the Canggu highway corridor regarding the factors causing traffic congestion in the Canggu Village area. Primary data was obtained by observat

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31

Chernova, O. T., V. Ya Grudz, Ya V. Grudz, and M. M. Yakumiv. "OPTIMIZATION OF CONTROL OF OPERATING MODES OF GAS TRANSPORT SYSTEM USING UGS." METHODS AND DEVICES OF QUALITY CONTROL, no. 2(47) (December 29, 2021): 72–82. http://dx.doi.org/10.31471/1993-9981-2021-2(47)-72-82.

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The Soyuz, Urengoy-Pomary-Uzhhorod and Progress gas pipeline systems form the basis of the trans-Ukrainian trans-Ukrainian pipeline system. The complex gas transmission system contains a number of gas pipelines forming a linear part and several compressor stations. The amount of capacity of pipelines depends on the number and characteristics of compressor stations. Reliability of work, regulation of transit flows and ensuring uninterrupted gas supply is carried out with the help of underground gas storage facilities, which are an integral part of the GTS of Ukraine. The use of underground stor

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Saghi, Hassan, Joško Parunov, and Antonio Mikulić. "Resistance Coefficient Estimation for a Submarine’s Bare Hull Moving in Forward and Transverse Directions." Applied Sciences 12, no. 21 (2022): 10953. http://dx.doi.org/10.3390/app122110953.

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Resistance of the bare hull of the tourist submarine with spherical heads, moving in forward and transverse directions is analyzed in OpenFOAM using Computational Fluid Dynamics. The resistance coefficients of the submarine are estimated for different length-to-diameter ratios and Reynolds numbers. The Artificial Neural Network with the optimum number of neurons is then trained to predict the resistance coefficients. Two simplified Artificial Neural Network models and Nonlinear Least Squares Marquardt-Levenberg algorithm are employed to fit the results in the form of equations that may be used

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Li, Yuanzheng, Junhui Shen, Meng Huang, and Zhanghai Peng. "Debris Flow Classification and Risk Assessment Based on Combination Weighting Method and Cluster Analysis: A Case Study of Debris Flow Clusters in Longmenshan Town, Pengzhou, China." Applied Sciences 13, no. 13 (2023): 7551. http://dx.doi.org/10.3390/app13137551.

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Debris flows can damage infrastructure and threaten human life and property safety, especially in tourist attractions. Therefore, it is crucial to classify and evaluate the risk of debris flows. This article takes 14 debris flows in Longmenshan Town, Pengzhou, Sichuan, China, as the research object. Based on on-site geological surveys, combined with drone images and multiple remote sensing images, the essential characteristics of each debris flow are comprehensively determined. A total of nine factors are used as the primary indicators affecting the risk of debris flow: drainage density, round

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Gatin, Inno, Juvel Čokić, Darjan Romić, and Joško Parunov. "CFD Study on the Influence of Exostructure Elements on the Resistance of a Submarine." Journal of Marine Science and Engineering 10, no. 10 (2022): 1542. http://dx.doi.org/10.3390/jmse10101542.

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Submersible vessels designed to operate at low speeds are often designed with an intricate exostructure, as well as other elements that are located outside of the main pressure hull. Exostructure elements are often of cylindrical or rectangular shape, positioned perpendicularly to the flow direction. For this reason, their resistance coefficient is relatively large compared to the pressure hull or appendages of a classical submarine. In some cases, the exostructure can significantly increase the wetted surface of the vessel and dominate its resistance. This paper presents a study on how differ

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Kholodenko, V. S., T. O. Basyuk, O. P. Budz, I. V. Hopchak, and A. O. Kholodenko. "ASSESSMENT OF THE UNIFORMITY OF SERIES OF OBSERVATIONS ON THE QUANTITY OF ATMOSPHERIC PRECIPITATION AND WATER LEVELS ON WATER BODIES IN THE AREA OF INFLUENCE OF THE KHMELNYTSKA NPP." Hydrology, hydrochemistry and hydroecology, no. 1 (67) (2023): 42–51. http://dx.doi.org/10.17721/2306-5680.2023.1.5.

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The energy strategy of Ukraine until 2030 envisages the completion and commissioning of power units 3 and 4 at the Khmelnytskyi NPP. An important factor in the correct, uninterrupted operation of the Khao NPP is the availability of appropriate water resources and water levels that can be restored with the help of precipitation, as well as flow regulation. During the research period from 2019 to 2023, the cooling pond of Khao NPP was not recharged by pumping water from the Horyn River. The research methodology is based on the application of the hydrological-genetic and statistical method. The h

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Syachin, A. E. "OPERATION COSTS IN HIGH-SPEED RAIL TRANSPORTATION." World of Transport and Transportation 16, no. 2 (2018): 128–36. http://dx.doi.org/10.30932/1992-3252-2018-16-2-12.

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For the English abstract and full text of the article please see the attached PDF-File (English version follows Russian version). ABSTRACT The author puts forward some ideas and drfat methods regarding future HSR in Russia, e.g. proposes a methodology for calculating the annual operating costs per 1 train-kilometer that arise when traffic is organized on Moscow-Kazan high-speed rail, depending on the speed and the main resistivity to train movement. Taking into account the coefficient of comfort and on the basis of the multi-criteria choice for an optimum composition of a train, a composition

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Дорошенко, Екатерина Викторовна, Михаил Владимирович Хижняк та Юрий Матвеевич Терещенко. "ВПЛИВ ГУСТОТИ РЕШІТКИ НА АЕРОДИНАМІЧНУ НАВАНТАЖЕНІСТЬ РОБОЧОГО КОЛЕСА ОСЬОВОГО ВЕНТИЛЯТОРА". Aerospace technic and technology, № 4 (28 серпня 2020): 38–43. http://dx.doi.org/10.32620/aktt.2020.4.05.

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The main requirements that apply to axial fans and axial compressors of aircraft gas turbine engines include minimum dimensions and weight; high aerodynamic load; high coefficient of performance; wide range of steady work; high reliability. For gas turbine engines, the requirements of minimum weight and dimensions are especially important, since the engines must provide flights at high velocities and altitudes. This study aims to assess the effect of the solidity of the impeller fan on the average radius on the aerodynamic loading of the impeller of an axial fan for an engine with a high bypas

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Onyshchenko, Artur, Mykola Harkusha, and Mykola Klymenko. "ANALYSIS OF CONSTRUCTIVE MEASURES FOR STRENGTHENING THE LOWER BEEFS OF HYDROTECHNICAL STRUCTURES OF TRANSPORTATION CONSTRUCTION FROM CULVERTS." Dorogi i mosti 2022, no. 26 (2022): 215–27. http://dx.doi.org/10.36100/dorogimosti2022.26.215.

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Introduction. Road culverts are one of the most massive hydraulic structures of transport construction in Ukraine. The bottom beef of such structures works in difficult operating conditions: with significant unevenness of the distribution of specific costs; high kinetics of the discharge flow and its saturation with sediments, floating garbage; small flooding of the diversion channel, etc. The main difficulty of the problem lies in the fact that a two-dimensional flow takes place in the area of free spreading, and in the area of quenching of excess kinetic energy, this two-dimensional flow tur

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Wang, Guorui, Hui Wang, Zheng He, et al. "Numerical Simulation and Risk Assessment of Debris Flows in Suyukou Gully, Eastern Helan Mountains, China." Sustainability 17, no. 13 (2025): 5984. https://doi.org/10.3390/su17135984.

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Suyukou Gully, located on the eastern slope of the Helan Mountains in northwest China, is a typical debris-flow-prone catchment characterized by a steep terrain, fractured bedrock, and abundant loose colluvial material. The area is subject to intense short-duration convective rainfall events, which often trigger destructive debris flows that threaten the Suyukou Scenic Area. To investigate the dynamics and risks associated with such events, this study employed the FLO-2D two-dimensional numerical model to simulate debris flow propagation, deposition, and hazard distribution under four rainfall

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Zhang, Xianqi, Wenbao Qiao, Yaohui Lu, Jiafeng Huang, and Yimeng Xiao. "Quantitative Analysis of the Influence of the Xiaolangdi Reservoir on Water and Sediment in the Middle and Lower Reaches of the Yellow River." International Journal of Environmental Research and Public Health 20, no. 5 (2023): 4351. http://dx.doi.org/10.3390/ijerph20054351.

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The Xiaolangdi Reservoir is the second largest water conservancy project in China and the last comprehensive water conservancy hub on the mainstream of the Yellow River, playing a vital role in the middle and lower reaches of the Yellow River. To study the effects of the construction of the Xiaolangdi Reservoir (1997–2001) on the runoff and sediment transport in the middle and lower reaches of the Yellow River, runoff and sediment transport data from 1963 to 2021 were based on the hydrological stations of Huayuankou, Gaocun, and Lijin. The unevenness coefficient, cumulative distance level meth

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Ngente, Lalnunthari, and B. P. Mishra. "Physico-chemical and bacteriological characteristics in of Tuikual river in Aizawl, Mizoram." Ecology, Environment and Conservation 28, no. 08 (2022): S57—S60. http://dx.doi.org/10.53550/eec.2022.v28i08s.010.

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The Tuikual river flows through Aizawl, also known as Tuithum Lui, before connecting with the Tlawng river, Mizoram’s primary source of water supply. The study was carried out over a year, from October 2020 to September 2021, with samples collected at monthly intervals. The research area was divided into four sampling locations along the river, from upstream to downstream. Pollutants carried by the river include untreated municipal garbage, sewage discharges, and biomedical effluents. The upstream Site 1 sample, which contained biomedical effluents from Aizawl Civil Hospital (Mizoram’s largest

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Koźmiński, Czesław. "FOREIGN TOURISTS IN THE PROVINCE OF WESTERN POMERANIA IN 2006-2016." Folia Turistica 52 (September 30, 2019): 43–56. http://dx.doi.org/10.5604/01.3001.0013.2641.

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Purpose. To assess the number, structure, seasonality and duration of foreign tourists’ visits to the Province of Western Pomerania in 2006-2016 as well as to identify preferred destinations in the Province. Methods. The research was based on monthly and annual data on foreign tourists’ visits and overnight stays in Western Pomerania counties in 2006-2016. The data supplied by the Statistical Office in Szczecin were used to model: the temporal (by month) and spatial (by country) distribution of the number of foreign tourists in the Province, the variability and seasonality of the tourism flow,

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Hrnjadović, Jasmin, and Nedim Suljić. "UNEVENNESS OF WATER CONSUMPTION IN SETTLEMENT ON THE CASE OF DOBOJ." Archives for Technical Sciences 1, no. 22 (2020). http://dx.doi.org/10.7251/afts.2020.1222.035h.

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Water consumption in a settlement is an extremely variable size that changes constantly over time. Changes in water consumption occur on an annual, monthly, weekly, daily and hourly basis, and depend on many factors such as: climate, season, temperatures, hours of work, consumer habits, etc.Extreme value of consumption, ie. the peak hour flow is defined as the product of the average daily consumption and the hourly non-uniformity coefficient. Non-uniformity coefficient is defined as the ratio of maximum flow to mean flow over a day, and given that actual flows fluctuate constantly over time, t

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Zhou, Ting, Cheng Ni, Ming Zhang, and Ping Xia. "Assessing Spatial and Temporal Distribution of Algal Blooms Using Gini Coefficient and Lorenz Asymmetry Coefficient." Frontiers in Environmental Science 10 (February 10, 2022). http://dx.doi.org/10.3389/fenvs.2022.810902.

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Algal bloom in an inland lake is characterized by significant spatial and temporal dynamics. Accurate assessment of algal bloom distribution and dynamics is highly required for tracing the causes of and creating countermeasures for algal bloom. Satellite remote sensing provides a fast and efficient way to capture algal bloom distribution at a large scale, but it is difficult to directly derive accurate and quantitative assessment based on satellite images. In this study, the Gini coefficient and Lorenz asymmetry coefficient were introduced to examine the spatio-temporal algal bloom distributio

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Yang, Guanglu, Meizhou Ding, Xinfeng Wei, Jinchu Yang, Yong Liu, and Xuehong Wu. "Numerical study on flow field uniformity of a pneumatic dryer." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, November 6, 2024. http://dx.doi.org/10.1177/09544089241295934.

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The non-uniformity of the airflow inside the dryer in pneumatic dryer directly affects the humidity non-uniformity at the exit of the cut tobacco, which is of significant importance to the quality of the tobacco manufacturing process. By establishing models of pneumatic dryer with two types of deflector, the unevenness of the airflow inside the dryer under different flow rate distributions of the hot air inlet and tobacco inlet is numerically analysed. The study found that the unevenness of the airflow inside the dryer is influenced by the flow rate distribution of the hot air inlet and tobacc

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Nikolaev, Vladimir K., Arkady A. Skvortsov, Zamir F. Khudayarov, and Roman S. Nikolaev. "Optimization of exhaust catalytic manifold of internal combustion engine." Journal of Materials Science: Materials in Engineering 20, no. 1 (2025). https://doi.org/10.1186/s40712-025-00238-3.

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Abstract The paper presents the results of gas dynamic calculation and strength analysis required to optimize the mathematical model of the body of the catalytic collector of a passenger car. Based on the obtained results of numerical modeling, the optimization of the case was performed. As a result of the gas-dynamic calculation, the optimal variant of the catalytic collector housing with the required uniformity of the exhaust gas flow in the input section of the catalyst (coefficient of unevenness (UI > 0.8)) was selected. According to the results of the strength analysis, stainless steel

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Shamkhi, Mohammed S., and Maryam Hussain Auad. "Assessment of Manning coefficient for Dujila Canal, Wasit/-Iraq." Open Engineering 13, no. 1 (2023). http://dx.doi.org/10.1515/eng-2022-0388.

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Abstract Assessment of Manning’s unevenness factor is of critical significance in hydraulic readings of open channel stream. Manning’s ( n n ) is obligatory for the computation of releases, water levels, and backwater curves, as well as plan curve additions. The correct value of Manning’s roughness coefficient ( n n ), i. H. a value that accurately reflects the observed data, is selected by the calibration process. The current study aims to calculate the Manning coefficient of the Dujila Canal due to this factor helps in developing water management systems, the Dujila Canal (a branch of the Ti

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Ma, Chao, and Bing Ge. "Heat transfer performance of steam/air flow in inverted V-shaped rib-roughened channels." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, May 18, 2021, 095765092110161. http://dx.doi.org/10.1177/09576509211016177.

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The heat transfer performance of steam and air flow in a rough rectangular channel with different inverted V-shaped ribs was investigated by infrared thermal imaging technology. Under the conditions that the Reynolds number is in the range of 4000–15,000, the effects of the rib angle on the heat transfer enhancement of the two coolants were obtained. The rib pitch ratio of the flow channel is 10, the ratio of the rib height to the channel hydraulic diameter is 0.078, and the inverted V-shaped rib angle varies from 45° to 90°. The results show that in the inverted V-shaped ribbed channel, the N

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Kirillov, Oleg, Vadim Kuts, and Olesya Shendrikova. "COMBINED ELECTRODE-BRUSH TREATMENT OF SURFACES OF PRODUCTS WITH VARIABLE ALLOWANCE." Voronezh Scientific-Technical Bulletin, December 26, 2022, 4–21. http://dx.doi.org/10.34220/2311-8873-2022-4-21.

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The article considers the possibilities of combined processing with an unprofiled electrode-brush of products with a large unevenness of the initial profile. The coefficient of unevenness was used to estimate the size of the allowance. Methods of obtaining parts with variable allowance, features of their processing are considered. These are parts obtained by casting, welding, stamping, roughing blade and electroerosion treatment. The surfaces of such parts are often characterized by high hardness and wear resistance. To date, there is no universal way to process such parts. Often, such details

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Xiao, Li, Yuchen Wei, Fan Zhang, et al. "A Study on Nozzle Structure Design and Process Optimization of RPB in the MEA Aqueous Solution CO₂ Absorption Systems." Asia-Pacific Journal of Chemical Engineering, June 7, 2025. https://doi.org/10.1002/apj.70047.

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ABSTRACTThis study improves a computational fluid dynamics (CFD) model for CO₂ absorption using a monoethanolamine (MEA) solution in a rotating packed bed (RPB) with porous media. It analyzes the impact of different liquid inlet nozzle designs and operational parameters on mass transfer and decarbonization performance. Results show that varying nozzle configurations have a negligible effect on the overall gas phase mass transfer coefficient and CO₂ removal rate, with deviations under 10% compared with uniform liquid distribution. However, nozzle design significantly influences temperature dist

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