bluuebunny/crossref_metadata_2025_split huggingface dataset:
Calculation Method of Aerodynamic Performance of Small Propeller with Serrated Trailing Edge
Authors: Lan Tian , Li Guoxi , Zhang Meng 
Published: August 2020

Abstract
The small propeller with serrated trailing edge of the UAV has the characteristics of low aerodynamic noise. In this paper, based on the momentum-leaf theory and modified the airfoil parameters, the aerodynamic performance calculation method of the propeller with a serrated tail structure is put forward. Combined with the CDF technology of three-dimensional aerodynamic performance analysis of small propeller blades at low Reynolds number, this method was used to calculate the aerodynamic performance of the small propeller with serrated tail structure, and the calculation results were experimentally verified. The experimental results show that, using the modified airfoil parameters, the established aerodynamic performance calculation method of the tail serrated structure propeller hover state has a good effect.
Current Situation and Prospect of Erosion Wear
Authors: Liang Na , Yuan Zhaohui , Wang Jiangtao , Kang Jian , Chu Yuanbo 
Published: August 2020

Abstract
The material loss and equipment failure caused by erosion wear is a serious problem in solid-liquid mixture flow in the mechanical, metallurgy, energy, building materials, transportation, aviation, aerospace, military and other industrial departments. Therefore, understanding the erosion wear mechanism, the influencing factors, and how to set up mathematical model are very important. Since the 1950s, the research on the erosion wear made great development. The purpose of this paper is to give a comprehensive review about previous research work of erosion wear. Firstly, the mechanism and influencing factors of erosion wear are introduced. Secondly, the forces of particle caused by fluid are analysed and several erosion models which tested by experimental with good results are introduced. Thirdly, the method of erosion numerical simulation combining computer software and CFD theory is introduced. Finally, based on the conclusion, some useful conclusions are drawn and the future research direction is prospected.
An Adaptive Searching Kriging Surrogate Model for Aerodynamic Optimization
Authors: Xu Liang , Tang Zhili , Feng Wenliang 
Published: August 2020

Abstract
The Kriging-based genetic algorithm applied to aerodynamic optimization design encounters a problem of unexpected sample size. In this paper, an adaptive method is proposed that the search space moves with the local optimum. The automatic division and hierarchical approximation of search space are realized by taking the selection of refinement samples into account. The typical function optimization and transonic supercritical airfoil drag reduction design are performed using this method. Results show that the number of samples required is greatly reduced, and the aerodynamic performance of the airfoil is efficiently improved.
Study of flow through and around a square cylinder array
Authors: Fang Yuhao , Yang Zhigang , Ma Yuan , Li Qiliang 
Published: August 2020

Abstract
This paper performs the effect of solid volume fractions (0.09< SVF<0.64) on the flow through and around a square cylinder array at Re=63832. A delayed vortex shedding occurs in 8x8 array (SVF) while the Strhoul number is slightly higher than the solid one. For the intermediate SVF (0.25<SVF<0.49), the separated shear layers (SSLs) contain large-scale turbulent eddies but their ends cannot interact to generate wake billows. The maximum of root mean square of transverse velocity along wake center-line decreases monotonously as SVF decreases, and several ways of defining the spatial extent of the wake region are discussed.
Experimental Research on Detection of Internal leakage of Valves in Pressure Air Pipes based on Acoustic Emission Technology
Authors: Wu Mengmeng , Dong Xiuchen , Yang Jiaxuan , Xue Shunyan 
Published: August 2020

Abstract
Valve leakage is a very important factor affecting the normal operation of pressure piping system. In this paper, based on the analysis of the mechanism of acoustic emission detection in the valve, under the condition of laboratory, the experimental platform and acoustic emission detection devices are designed and built. The experimental results show that acoustic emission technique can be used to detect leakage and evaluate leakage rate, which is very important for the real-time monitoring and quantitative detection of leakage in the pressure pipeline valve.
Experimental Equipment for Forced Convection Heat Transfer with Equilibrium Tracking
Authors: Zhang Zhigang , Sun Xiaoqin , Tang Lijun 
Published: August 2020

Abstract
Based on the principle of forced convection heat transfer in a single tube with air transverse sweep, an experimental device of forced convection heat transfer with equilibrium point tracking was developed. The device controls wind speed, heating power and other experimental working parameters by MCU, synchronously adjusting, collecting and analyzing working parameters in real time, to realize the tracking of thermal balance point. Newton cooling formula and criterion relation are adopted to calculate Nusselt number and Reynolds number automatically, to fit criterion relation and to display correlation curve automatically, and to realize automatic data analysis. The test results show that the experimental results are in good agreement with the empirical correlation formula within the Reynolds number range of 40 ~ 4000, which realizes the automatic tracking of thermal equilibrium point and meets the requirements of real-time automatic measurement in forced convection heat transfer experiment.
Effect of suction and blowing control on NACA 0012 airfoil at low Reynolds number
Authors: Zhang Zhiyong , Wang Tuantuan , Wang Yafei , Guo Hao 
Published: August 2020

Abstract
To control the separation of flow past an airfoil with a simple jet mechanism, based on the Large Eddy Simulation from Favre, a suction-blowing combined jet is studied with holes placed on a NACA0012 airfoil’s upper surface and Re = 104 attack angle α = 6°. The results show the control mode of front-hole suction and back-hole blowing is effective. It can suppress the disturbance in the flow field and increase the lift-to-drag ratio of the airfoil at the same time.
Validation of momentum source method in the analysis and prediction of the rotor finite ground effect in hover
Authors: Li Huan , Li Bin , Chen Jiangtao , Cui Pengcheng , Zhang Yaobing 
Published: August 2020

Abstract
Aiming at the complex flow phenomena with multiple speed scales and the high computational cost constraints of the rotor’s finite ground effect, the momentum source methods to satisfy the computational accuracy and efficiency are developed. Combined with the preconditioning methods, which cope with multiple speed scales, a numerical simulation method for the finite ground effect of the rotor is presented. On this basis, the validity of the numerical method is verified by hovering case firstly. The thrust only slightly increases by 3.26% compared with the experiment. Then, the effects of rotor deviation and height on the aerodynamic performance of the rotor are studied, and a surrogate mode with finite ground effect is established, which is tested by the testing samples on its prediction accuracy. The conclusion shows that the momentum source method can be applied to the analysis and prediction of the finite ground effect of rotor hovering, and the finite ground effect has a significant impact on the overall aerodynamic performance of the rotor.
Research on Stepless Force Control Strategy of Multistage Force Cylinder Based on Simulation
Authors: Bao Zhongfu , Zeng Dejiang 
Published: August 2020

Abstract
Aiming at the problem that the output force of the cylinder is small, this paper studies a method based on the simulation technology to obtain the larger output force and realize the stepless control of the output force. Through the simulation analysis, it can be seen that the system can achieve a more stable output force control when the system damping is large. There will be a certain amount of impact when each stage of cylinder is started.
Investigation on Battery Thermal Management of Power Battery Based on Environmental Impact of Electric Vehicle
Authors: Xiong Fei , Ouyang Chenzhi , Zeng Junxiong , Zhu Linpei , Li Gang 
Published: August 2020

Abstract
The present study on battery thermal management performance is mainly based on the research conducted in a single-pack environment, without considering the impact of the vehicle driving environment on the thermal performance of the power battery. Therefore, this paper conducts a research on the thermal management performance of the power battery and considers the effect of heat exchange under the driving conditions of the whole vehicle. In addition, the ohmic heat generation method of a battery pack in the process of charging and dis-charging is established in this paper. The complete heat exchange condition of a liquid cooling power battery is obtained and the research of thermal management performance is carried out. The results indicated that the tested temperature values at sensor NTC position are in good agreement with the predicted data. The maximum temperature deviation between numerical results and experiment data at the same temperature sensor (NTC) position is 1.4 °C, which demonstrates that the prediction accuracy of numerical simulation methods adopted in this paper is significantly high.
Design and optimization of air intake system based on FSC
Authors: Guo Huali , Fu Baogui , Huang Zitao , Zhang Ruibin 
Published: August 2020

Abstract
Based on the requirements of Formula Student China racing rules, the maximum diameter of the restrictor valve is 20mm in the intake system. In order to improve the engine charge coefficient and reduce the impact on performance caused by uneven air intake of each cylinder, it is quite necessary to redesign and analyse the air intake system under. Firstly, we calculate the volume of the pressure stabilizing chamber and the length of the intake manifold applied theoretical knowledge. Secondly, we redesign the model of intake system using UG software, which includes the parameter of the throttle angles for inlet and outlet, the intake manifold length, the volume of the pressure stabilizing chamber. By comparing and analysing the different data of inlet-outlet angles for the restrictor valve and the height of the baffle located in the stabilizing chamber, we can came to a conclusion after using CFD software that it is the optimal value when the inlet angle for throttle is 14 degree, the outlet angle is 22 degree and the height of the baffle is 10mm, the intake unevenness of each cylinder is 1.4%, and the total intake air is increased by 5.5%.
Sustainable Development Indicators in Benchmarks of Russia’s Regional Policy
Authors: Tyrsin Alexander N , Vasilyeva Elena V 
Published: August 2020

Abstract
We have considered the problem concerning the substantiation of sustainable development indicators and the improvement of the standard of living of the population in Russian regions. To quantify the standard of living of the population, we have used a common indicator such as the Human Development Index. The authors present an approach to managing the region in the form of optimization problems aimed at improving the standard of living of the region’s population by increasing the probability of its classification as a region with a higher standard of living. The optimization problem is solved based on the identified relationship between the standard of living of the region’s population and its socioeconomic indicators.
Assessment of energy efficiency of initiative budgeting projects in the Yamalo-Nenets Autonomous district
Authors: Tsurkan Marina , Serditova Natalia , Vorotnikov Aleksandr 
Published: August 2020

Abstract
Some approaches to evaluating energy-efficient initiative budgeting projects are presented on the example of Yamalo-Nenets Autonomous district, the region of the Arctic zone of the Russian Federation. Formulas and an algorithm for evaluating the effectiveness of budgeting initiative project implementation to improve the energy efficiency of housing and communal complex are developed. An evaluation approach for energy efficiency of street lighting systems is proposed based on basic and optional criteria.
Assessment of sustainable development of region
Authors: Tamenova S , Satpayeva Z , Sarkytova A , Nurgissayeva A 
Published: August 2020

Abstract
The abstract presents a critical review of the existing approaches to the assessment of the sustainability of the region that defines the development level of the social and economic system. The authors conducted the assessment of sustainability of the biggest region of Kazakhstan, Almaty oblast. The city of Almaty is a city of republican status and is not administratively part of Almaty oblast. The findings showed that in terms of dynamics the development of Almaty oblast as such is characterised as very close to being a sustainable one. Regardless of the fact that environmental and economic subsystems have shown stable growth, the social subsystem has features of instability.
Digitalization of Safety in the Field of Labor Protection
Authors: Sergeenko Yu S , Galkina O V , Zametina T V , Kombarova E V , Petrov D E 
Published: August 2020

Abstract
Modern enterprise safety technologies affect the life and health of people all over the world, as well as the quality of full, clean functioning of the environmental protection system. According to the authors, from a scientific and practical point of view, the project is aimed at solving one of the vital problems at enterprises – it is the safety and security of citizens (workers) in the workplaces, the warning and prevention of accidents at work, the creation of a digitalized mechanism for regulating occupational safety at the enterprise. The authors of the project proposed and justified the introduction of a new scientific direction (concept) - digitalized safety in the field of labor protection, as well as the need to introduce and develop new digital technologies in the field of labor safety. The study developed a system (consolidation, which is required in the ILO Convention) to establish digitalized platform in each state for violations of labor protection, as well as scientific understanding of the mechanism of interaction between the three components (subjects) for labor safety, for global improvement of safety systems at the enterprises.
Substantiation of Ecological Safety Criteria in Construction Industry, and Housing and Communal Services
Authors: Larionova Yuliya , Smirnova Elena 
Published: August 2020

Abstract
In the article the authors attempt to determine the construction industry’s ecological safety criteria. The authors provide an integrated methodological substantiation for ensuring ecological safety in construction. They consider the ecological monitoring system, the criteria and conditions for implementing this system, and the principles of ecological monitoring laid down in ecologically-oriented standards. An analysis of the ecological monitoring system at all stages of the construction product life cycle shows that the confusion prevailing in the regulatory departments impedes the development of ecological investments in construction projects. Therefore, it is necessary to establish an independent structure focused on environmental protection. By transferring maximum power to this new structure it will be possible to quickly solve problems related to ecological monitoring as part of the movement towards the country’s balanced development.
Legal Aspects of Regulating Disturbed Land Reclamaition
Authors: Galanina T V , Baumgarten M I , Koroleva T G 
Published: August 2020

Abstract
The impact of coal mining on the Kuzbass region ecosystem is studied in the article. Large-scale mining have led to land disturbance over large areas. The Coal Industry Development Program, which provides for a significant increase in production, will make the identified problem more important. In this regard, the problem of the coal industry should be solved simultaneously with the restoration of natural ecosystems through high-quality land reclamation. The existing regulatory framework for reclamation is assessed in the article. The mechanism of legal regulation of reclamation of disturbed lands at the regional and federal levels is proposed. Improving the quality of reclamation will be facilitated by the development of a strategy for the restoration of the natural environment, which would be reflected in the Concept of disturbed land reclamation.
Functional Model of Influence of UV-B (TOC) and Climate on Tree Responses
Authors: Bondarenko S L , Savchuk D A , Ustinova I G 
Published: August 2020

Abstract
In the framework of the functional model of the influence of atmospheric parameters on the growth of conifers, it is shown how changes in the level of UV-B radiation, indirectly related to changes in stratospheric ozone, affect the density of annual rings. Phytohormones initiate tree adaptation mechanisms by regulating the growth rate of tree cells. The simulation results showed that there is a strong relationship between the rates of changes in density and total ozone content.
Influence of Water Treatment Plants on the Ecological Situation in Industrialized Regions
Authors: Volkova O I , Zolotukhina N A , Zolotukhin V M , Yazevich M Y 
Published: August 2020

Abstract
The article investigates the most effective methods of water purification necessary for its application in power generating systems. The need for this is due to the need for water purification, bringing it to a quality state that allows it to be used in industry. The most effective modern method of purification is the method of using of ion-exchange resins, since water purified from the mineral elements contained in it (desalting) is mainly used. One of the effective methods of desalting, from an ecological and economic point of view, is ion exchange, based on the removal of inorganic substances, heavy metal ions and other substances from the water. The essence of this method is the ability, with the help of ion-exchange resins, to sorb unwanted elements and their compounds from water. This technology allows to achieve water quality which corresponds to standards (technical norms) in various spheres of consumption. The authors show the influence of various parameters on the efficiency of the ion exchange process in order to improve the quality of desalination and reduction of wastewater. The stages of desalination of process water are considered in order to determine the state of wastewater at different stages. Proposed alternatives is economically and environmentally beneficial solutions to problem with wastewater and analysed ways of regeneration, as well as advantages and disadvantages of switching from once-through regeneration in countercurrent. In the presented designs, when using filters with different regeneration options, positive characteristics of monodisperse resins necessary for water purification in accordance with the requirements of environmental standards are determined.
Territorial Protection Maintenance of the Wildlife Species Listed in the Red Data Book of the Nizhny Novgorod Region
Authors: Bakka S V , Kiseleva N Y , Mizgireva M S , Vandysheva T D , Arefieva S V 
Published: August 2020

Abstract
The paper summarizes the results of the analysis of the territorial protection maintenance of the wildlife species listed in the Red Data Book of the Nizhny Novgorod region. To assess the current state of territorial protection of rare wildlife species the database containing 3599 facts of registrations of the rare wildlife species on approved and projected protected areas of the Nizhny Novgorod region was compiled by the authors. In addition, authors have offered to recognize 5 levels of the protection maintenance: full, good, satisfactory, poor, and absent. Authors have evaluated the scale of changes in the rare wildlife species providing with territorial protection in the XX-XXI centuries as well. The territorial protection maintenance of the rare wildlife species in the Nizhny Novgorod region has grown significantly over the past 40 years. In 2001, the rare wildlife species listed in the Red Data Book of the Nizhny Novgorod region were known to inhabit only 195 protected areas. Now the rare species of animals, plants, fungi and lichens are protected in 227 approved protected areas, and 92 territories are projected for the protected areas establishing. In general, the territorial protection of rare species listed in the regional Red Data Book seems to be satisfactory, but need the significant improvement. It is necessary to create additional protected areas along with continued searching of rare species habitats.
Risk Reduction of Occupation Diseases by Optimization of Schedule of Work and Rest on Example of Workers of Electrolytic Production
Authors: Smirnova N К , Krivobokova V A , Belyakin S К 
Published: August 2020

Abstract
The article considers the actual question of risk estimation of non-evident professional diseases. On the basis of the conducted assessment of the acting schedule of the work of a pot operator of molten salts of one of the departments of the Urals aluminum smelter and determined unaccounted peculiarities of daily dynamics of the behavior of biological processes in the human organism while work scheduling, the authors have developed rational shift schedule, in which the time of a worker’s night shift is maximally cut. The proposed schedule is aimed at preventing accidents and decreasing the risk of occupation diseases of employees. The provided material has a great practical significance as the main principle of the management system of professional risks is health maintenance in the process of production activity.
Long-term Post-fire Monitoring of the Breeding Bird Populations in the Kerzhensky State Nature Biosphere Reserve (Central Volga region, Russia)
Authors: Noskova O S , Kolesova N E , Bokadorova E I 
Published: August 2020

Abstract
In the summer of 2010, about a half of the Kerzhensky State Nature Biosphere Reserve territory suffered from a wildfire. During the 9 following years, monitoring of the bird populations in the breeding season was conducted there. Birds were counted by a route method in 6 main habitats differ in their fire burned types and also in unburned similar habitats. A total of 130 bird species were registered. In the first years after the wildfire impact, bird populations in the habitats affected by different wildfire types were similar according to the Sorensen-Chekanovsky’s index. This similarity increased to 2016. The similarity of the bird populations of burned sites has been decreasing last two years. The species richness changed in different directions. At first study years, the abundance of the breeding bird populations increased both in burnt and unburnt sites, while later this parameter decreased a bit and stabilised. Although interannual changes in indicators are still possible. The bird populations of the unburnt habitats, especially bogs, differ by lower values of indicators for the last five years. The influence of nature-climatic indicators of various months (average the monthly air temperature, the daily amount of precipitation) on the interannual dynamics of the breeding avifauna abundance was noted in only one case, out of 84 indicators. We distinguished the species (e.g. Sylvia communis) recognised as indicators of damaging by fire. Fringilla coelebs was dominant in all habitats studied, but from 2017, Anthus trivialis dominated in the severely burned birch-pine forests and on the raised bogs (burned and unburned). The most intense changes in bird populations were observed within the first five post-fire years.