bluuebunny/crossref_metadata_2025 huggingface dataset:
Large projects and small communities: the influence of industrial development on remote villages in Eastern Siberia
Authors: Krasnoshtanova N E
Published: January 2021

Nowadays, the development of oil and gas extractive activities and logging industry are occurring actively in Eastern Siberia. These industrial activities transform the habitat of indigenous and other local peoples in Eastern Siberia, who live in remote areas and are engaged in traditional activities. Therefore, the issue of sustainable development of these remote areas acquires special relevance. This article examines the issues of sustainability of such areas in the theoretical framework of the concept of social-ecological systems and their adaptive abilities in changing conditions. On the example of the northern municipality in the Irkutsk Region, we consider the influence of industrial activities on remote small communities and study their adaptive abilities. On the one hand, these communities adapt to changing conditions, continuing to be engaged in traditional activities, but, on the other hand, the growing impact of industrial activities on the natural environment limits these opportunities in the future, as it reduces the reproductive functions of local ecosystems.
Social, economic and ecological characteristics of suburbanization development
Authors: Emelyanova N V , Dugarova G B , Dorjgotov B , Antipina Yu V
Published: January 2021

This study is devoted to the suburbanization as an important stage of agglomeration development. Foreign research into suburbanization has almost a century-old tradition. In Russia the degree of previous study on these themes is low and very few investigations on this problem have been carried out to date. Therefore, the current relevance of the topic presented remains beyond any doubt. The novelty of this research implies that suburbanization is regarded as one of the main trends in the development of the settlement structure of the Irkutsk agglomeration and a new way of life of a large peripheral city. This study permitted us to identify specific features of suburbanization in the Irkutsk agglomeration. The main trends in suburban development are determined, which are due to the economic, social and ecological factors. Of particular importance in this investigation are mapping and geoinformation methods which have great potential for integral real-time presentation and analysis of the suburbanization process. For this purpose, a series of maps displaying different aspects of the study territory (change in population size, dynamics of construction, etc.) has been compiled. We identified five groups of municipalities of the Irkutsk agglomeration according to the development factors of the territory. The findings indicate a sufficiently dynamic process of change in the suburban territory of the Irkutsk agglomeration. The main conclusions are of great practical significance for administrative bodies considering that the development of the network of suburban settlements and its delimitation are most relevant to date.
Assessment of recreational load on the social environment (as exemplified by the Lake Baikal shore)
Authors: Evstropyeva O V , Shekhovtsova T N
Published: January 2021

The prospects for socio-economic development in the regions of Cisbaikalia are associated with the development of tourism industry. The harmonious development of the territory, taking into account the interests of the local population and needs of guests of the territory, is essential to ensure security and satisfaction with the facility services, as well as the well-being of the local population. The article presents a typological approach for assessing the recreational load on the social environment of settlements. The optimal ratio of tourist number to the permanent residents, close to 1: 3 (0.3), was taken as a basis. Noted, that this ratio is a guarantee of the atmosphere of hospitality, and the local population does not experience a significant tourist pressure. Environmental models are also used and contribute to the most complete research of the adaptation processes of the local population to changes in the system of life, introduced as a result of recreational development of the territory. The waterside at Lake Baikal was selected as a model within the boundaries of the central ecological zone of the Baikal natural territory (CEZ BNT). We revealed five types of territories according to the level of recreational load on the social environment.
Ecological state of soils and water resources of the central cities of the urbanized territories of Irkutsk oblast, Buryatia and Mongolia
Authors: Belozertseva I A , Gagarinova O V , Vorobyeva I B , Sorokovoi A A , Emelianova N V , Dorzhgotov D , Enkh-Amgalan S , Lopatina D N
Published: January 2021

As the pace of urbanization accelerates, the quality of life in large cities is becoming increasingly determined by the level of preservation of the components of the natural environment. One of the main ecological living-standard criteria is the quality of water resources and soils. The article analyses statistical and published materials on soil and water pollution of the Baikal region. Soils and surface water samples taken in the central cities of urbanized territories (Irkutsk, Ulan-Ude and Ulan-Bator), as well as in adjacent territories were analyzed for the content of macro-and microelements. It was revealed that the most contaminated soils are in the city of Irkutsk due to the presence of a large technogenic load and high sorption capacity of soils. Soil degradation and pollution in the Baikal region has been mapped. The map shows actual pollution and possible potential, taking into account environmental conditions. The highest pollution of surface waters is observed in the Tuul river, downstream of Ulan-Bator due to the high technogenic load and the fact that natural waters of steppe regions initially have high content of chemical elements, and the soils are fine textured, therefore, pollutants can easily migrate through surface and ground waters. A map of surface water quality of the Baikal natural territory has been compiled.
Differentiation of dependency ratio in Irkutsk oblast
Authors: Dmitrieva Yu N
Published: January 2021

The article determines the dependency ratio among municipalities of Irkutsk oblast. We designed scales with ratio gradation for mapping the results for different types of dependency burdens. We revealed that the youth population less than 400 per 1,000 people is typical for northern peripheral districts of the region and for the well-developed industrial and multifunctional central cities. The connection between the long-term mean birthrate within the main settlement zone in the region and mean indices of youth dependency burden from 400 to 600 is determined. Minimal old dependency burden (less than 400) have been revealed in the regional center Irkutsk and the Irkutsk district with higher working-age population, in most other districts the old dependency burden has mean values 400 to 500 per 1,000. Maximal value of the old dependency ratio is typical for the north of the region and they are determined by migration outflow, low birthrate and aging population. We have summarized the values of youth dependency ratio and the old dependency ratio and revealed a significant differentiation of indicators of the total dependency load in the region within the values up to 800 and more than 1,000. The northern regions with a considerate proportion of pensioners in the total population and the regions of the main settlement zone with mean values of both ratios and the regions of Ust’-Orda Buryat okrug with traditionally high birthrates experience the greatest dependency load on the workforce.
Interregional lake basin management: the case of Lake Tahoe
Authors: Dets I A
Published: January 2021

The article provides an overview of the environmental conservation development in the lake Tahoe basin, located on the border of two US States. The geographical feature of the location made the process of managing economic activities on the lake more complex. The article highlights the role of local environmental organizations that contributed to public debate on lake pollution issues, which resulted in the formation of a unique Agency managing regional planning in the lake’s catchment area. The historical overview of the main events related to the activities of the Agency and environmental organizations in the region is also presented. The analysis shows that the organization of a single governing body has not brought rapid results in environmental protection; the contradictions between economic growth and environmental protection remain. Regulatory experience in the Lake Tahoe Basin shows that many restrictive measures can be challenged in litigation under the rule of law. The results also show that the achievement of the set environmental indicators, even if the Agency is established, is problematic; and the measures taken can lead to a significant reduction in the number of permanent local population and stagnation in certain sectors of the local economy.
Asian Russia and the deglobalization trend
Authors: Cherenev A A , Popov P L
Published: January 2021

The article substantiates the hypothesis according that says the socio-economic and geopolitical position of the Asian part of the Russian Federation should be considered not only in the context of globalization, but also in the context of the competing trend of deglobalization. The work lists the processes of an anti-globalization nature in many countries. Deglobalization entails increasing the role of states geographically close to the eastern macroregions of Russia, which creates both additional opportunities for socio-economic development and cooperation, and geopolitical risks. Socio-economic cooperation can be expressed in the creation of closer ties both between macroregions and with neighboring states, and the accelerated development of the underdeveloped spaces of the eastern macroregions of Russia. The negative consequences can be expressed in the increased pressure of some geopolitical actors on Siberia and the Far East. These geopolitical actors are the United States, China, Japan and Turkey. The USA expansion of can be expressed in economic penetration, support for the liberal opposition, ideological directions of the liberal circle, and expansion from Japan – in economic penetration. From Turkey it is possible to support ethnic movements of the Pan-Turkist orientation, and from all the countries mentioned above -in support of macroregional and ethnic separatism.
Modern exogenous processes in the mountains of Cisbaikalia
Authors: Plyusnin V M
Published: January 2021

Lake Baikal and its shores become attractive for tourists. The growth of tourist flow forces the stakeholders to develop new territories and water areas, create a tourist infrastructure, involve more natural resources, but also concern about safety of tourists. In the ridges of the Baikal region as in most mountainous countries hazardous exogenous processes present a danger to tourists. We studied modern processes and prepared to their mapping in order to identify areas which are subject to one or another exogenous process and intensity of their occurrence at two key areas in the Baikal and Barguzin Ranges. We arranged field expeditions, analyzed remote sensing data of the Earth, used meteorological data, studied geological structures, made morphometric mapping, and took samples for chemical analysis of sediments, mapped plant groups, measured areas, lengths, and depths of relief forms created by exogenous processes. The results obtained led to the creation of large-scale maps of main exogenous processes of relief formation, intensity of their course, length and action mode and to the adjustment of meteorological parameters, absolute heights and slopes, tectonics and ancient glaciation. Our study determined the patterns of exogenous processes, areal, linear, fan-shaped, pointed and diffused. Development of certain types of exogenous processes in the mountains of Cisbaikalia is due to seismic activity, high vertical and horizontal dissection of the relief, and the peculiarities of climatic conditions. Paying attention to them will ensure avoiding catastrophic impact on the recreational development of the mountainous territories of Cisbaikalia.
Optimization Design of Deep Foundation Pit Support Scheme under Traffic Dynamic Load
Authors: Kang Li , Wang Yanwei , Cao Jianhao , Bai Song
Published: January 2021

In this paper, based on the deep foundation pit support of the reconstruction and expansion project of Jiqing expressway, numerical software is used to establish the numerical calculation model of the deformation support of deep foundation pit under the influence of traffic dynamic load. The numerical calculation results are consistent with the actual project monitoring results. By changing the support parameters such as pile diameter, pile length, vertical support distance in different support schemes is analyzed. The results show that the ideal diameter of bored pile is 0.8-1.2m, the length of pile is 23m-28m. With the vertical support distance increasing, the change trend of horizontal displacement of piles gradually increases. Considering the safety of foundation pit and the reduction of project cost, the pile with length 23m, diameter 0.8m and the vertical support distance 5m is chosen in the practical engineering.
Study on simulation method of excavation of metro transfer station
Authors: Zhu Henghua , Li Hu , Wei Ruchun , Shang Hao , Jia Chao , Wang Xin , Ma Yuhong , Zhou Yang , Li Shuang
Published: January 2021

In order to study the numerical simulation method of metro transfer station, a three-dimensional finite element model with and without considering fluid-solid coupling effect is established based on a metro transfer station of Jinan. The difference between the displacement of diaphragm wall, as well as the ground surface settlement, under the two conditions is compared. And a conversion equation of the retaining structure is deduced to convert the discontinuous pile wall into a continuous wall for numerical simulation modelling. The conclusions of this paper could serve as a reference for the numerical simulation of other metro transfer station projects.
Design of the Outdoor Cruising Control System of the Quadrotor Drone
Authors: Zhang Xiaomei , Chen Chengbin , Su Kaixiong , Lin Liang , Tian Yaoyuan
Published: January 2021

During the outdoor cruising flight of the UAV, it will often cause problems such as inaccurate positioning information and course to drift due to interference of sensor signal errors, ground effects, airflow, and communication delay. In this paper, an outdoor cruising control system of the quadrotor drone is designed, where the Kalman filter and the Mahony filter are adopted to fuse the sensor data to obtain the attitude to be controlled, and the PID control method is introduced to reduce the external noise to the control system. As a result, the GPS/INS combined navigation method was used to design the quadrotor drone controller. The system improves the anti-jamming capability of the aircraft, has the advantages of real-time, fast response, and high precision, and can realize the positioning cruise function of the quadrotor aircraft in a complex outdoor environment.
Numerical Simulation Analysis of Cutter Head of Large Diameter Metro Shield with Soft Upper and Hard Bottom
Authors: Luo Qingfei , Cao Quan , Li Wei , Xue Yanjun , Meng Qingming , Shen Peng , Zhang Mengheng
Published: January 2021

Taking the large-diameter shield cutter head between Xinglong Station and Tianfu new station in Civil Engineering Section 4 of Chengdu metro line 18 as an example, the numerical simulation is carried out by finite element software to analyze the stress and deformation of large-diameter shield cutter head under different loads in upper soft and lower hard strata. The results show that the stress and deformation of cutter head meet the design requirements, which can provide certain reference value for similar projects in the future.
Fuzzy Mathematics Comprehensive Forecasting Analysis of Metal Mine Rockburst Based on Multiple Criteriahere
Authors: Hu Nan , Li Changhong , Liu Yang , Wu Yunfeng
Published: January 2021

The underground environment in deep mines is complicated and the risk of rockburst is high during excavation. Therefore, it is of great significance to study the tendency of rockburst during excavation. At present, scholars from various countries have analyzed rockburst phenomena from the aspects of strength, stiffness, energy, etc., and have proposed various assumptions and criteria. However, these assumptions and criteria often only consider individual factors, which will lead to one-sidedness and limitations. This article takes the deep mining process of a metal mine as the research background. Based on the results of each independent criterion, fuzzy mathematical theory is introduced to evaluate the rockburst intensity and fuzzy comprehensiveness of various types of rocks in the project. The research results show that the multi-criteria comprehensive evaluation of fuzzy mathematics can well integrate the analysis results of each criterion, and has higher consistency with the actual situation in engineering.
Effect and Mechanism of Quicklime on Stabilized Loess
Authors: Xiao Xie , Wei Yulu , Wang Gao
Published: January 2021

Lime is a cheap and easily available building material, which can greatly change the physical and mechanical properties of soil and is widely used in engineering construction. This article summarizes the effect and mechanism of quicklime in improving loess mechanical properties. The changes of physical and mechanical properties of loess after lime added and the internal mechanism of lime-improved soil are summarized, also, the factors affecting lime-soil improvement are analysed.
Numerical Calculation and Analysis of Gun Barrel Heat Transfer
Authors: Xi Shouzhi , Wu Hanzhou
Published: January 2021

With the help of classical interior ballistic model, the thermal environment parameters inside and outside the gun barrel are analyzed and calculated. Then, the finite difference method is used to calculate the heat transfer process of the barrel, and the distribution of the peak temperature and radial temperature field is obtained. The results show that the inner wall temperature increases rapidly at first, and the speed of temperature increase gradually decreases when the inner wall temperature reaches the extreme value, and the speed of temperature decrease gradually. In the case of continuous firing, the temperature does not necessarily decrease monotonically in the radial coordinates of the barrel. Under certain circumstances, one or more extreme points may appear.
Analysis of Renewable Integrated DG Investment Planning Based on Emission Cost
Authors: Niu Kun , Lyu Zhongni , Zheng Boyuan
Published: January 2021

The prospect of distributed power generation investment planning (DGIP) is particularly important in island networks due to multiple reasons such as energy security, emissions, and renewable energy integration goals. Against this background, this article proposes a consideration that includes various types of DGIP models including renewable energy. The planning process includes an economic analysis that takes into account emissions costs, reliability and other related cost components. In addition, the variability and uncertainty of model parameters for distributed generation comprehensive sensitivity analysis of the impact of investment decisions. The ultimate goal is to determine the parameters that have an important impact on the decision-making process and quantify their degree of impact. The results show that uncertainty has an important impact on DG investment decisions. In fact, the degree of impact varies depending on the parameters. However, in general, ignoring or not fully considering the uncertainty and variability in model parameters is a quantifiable cost. The analysis made in this article is the most relevant to determine the need for special attention in planning practice the model parameters are very useful.
Research on Boost Converter in Photovoltaic DC Boost Collection System
Authors: Ma Yongwei , Suo Lian
Published: January 2021

With the development and utilization of renewable energy, the DC collection of photovoltaics has solved the difficult problem of photovoltaic transmission, and the research of high-voltage and high-power converters has become the key. The boost full-bridge isolated converter (BFBIC) is used as the basic boost module, and the voltage level of the DC transmission line is reached through the independent input of the photovoltaic array and the parallel output of the boost converter. Moreover, after analysing the working principle of BFBIC and introducing the control transfer function of the boost module, this paper combines the principle of maximum power point tracking (MPPT), and adopts the classic double closed-loop control strategy. Finally, the simulation model is built in RTDS. By considering the operation of the system under the conditions of constant irradiation and changing irradiation, the simulation results verifies the feasibility of the system.
Remote Maintenance System of Industrial Ultra-Pure Water Based on Deep Learning
Authors: Sheng Xu , Lei Wang , Xiang He
Published: January 2021

In order to meet the requirements of controlling the water quality of electric power, electronics and other manufacturing industries and reducing energy consumption through remote operation and maintenance system, an intelligent remote operation and maintenance system of ultra-pure water is constructed for ultra-pure water manufacturing in electronic industry. radial basis function neural network and generalized regression neural network are used to fit and predict the effluent quality of ultra-pure water. Through data analysis, the above algorithm is used to realize the accurate prediction of ultra-pure water system and intelligent adaptive control, which improves the accuracy and convergence speed of the algorithm. The results show that on the basis of the simulation of the model, the purpose of improving water production quality, saving energy and reducing consumption can be achieved through backwater utilization and frequency conversion speed regulation.
Research on voltage control strategy optimization of wind farm cluster
Authors: Zhang Meilun , Xu Maoda , Zhang Jin , Hao Wenbo , Hu Yuanting , Liu Jin , Zhang Rui
Published: January 2021

With the continuous expansion of the grid-connected scale of wind farms, the problem of the stability of the grid-connected point voltage of wind farm cluster has become increasingly prominent. However, the current reactive voltage control strategy of wind farm cluster has less research on the optimization of the internal node voltage and grid loss of wind farms, and the problem of the reduction of wind turbine life caused by the full reactive power of doubly-fed wind turbines needs further research. In view of the above problems, this paper proposes a wind farm cluster reactive voltage hierarchical control strategy based on the reactive power margin of doubly-fed wind turbines. The strategy improves the traditional artificial fish algorithm and realizes the reactive voltage control of wind farm cluster. As a result, the node and network loss have reached a certain degree of optimization.
Research on Real-time Automatic Acquisition Technology of Topology Data in Distribution Network
Authors: Chen Jing , Lin Chao , Xue Yingwei , Hu Jiandi , Li Jiaying
Published: January 2021

The current distribution network equipment renovation plan arrangement is mainly based on the equipment health level, operating years and other indicators. Coordination and optimization between renovation projects are still lacking. Scattered and disorderly transformation will cause potential safety hazards in the distribution network operation. The paper proposes to establish a unified real-time data collection platform for distribution network based on real-time/historical database, and gives the construction idea and implementation plan of the platform. The designed platform has data interfaces with mainstream production control systems, user meters and electrical related systems, and integrates a wealth of common software tools, which can manage and analyze the real-time/quasi-real-time data of the distribution network in a unified manner and can facilitate Coordinated with the implementation of advanced applications of smart distribution networks, it has laid the foundation for the analysis and control of the optimized operation of the entire grid/local area grid and the construction of an integrated model of smart grid operation and distribution. At the same time, the paper proposes a method for checking the topology of low-voltage distribution networks based on outlier detection, calculates the correlation coefficient between the voltage sequence data to measure the similarity of the voltage curves of different users, and finally verifies the users and stations in the grid GIS system The correctness of the zone transformer topology connection relationship.
Study on the adaptability of 5G and wireless private network applied to the protection of medium voltage distribution network
Authors: Shen Bing , Zou Xiaofeng
Published: January 2021

With a large number of grid connected renewable energy power generation brings new challenges to the operation and management of power grid in the future, the deep penetration of distributed energy makes the distribution network from the passive network with unidirectional power flow to the active network with bidirectional power flow, and the protection business of distribution network presents the situational demand of large data volume, high performance and new energy access. This paper makes use of the characteristics of 5G communication network, such as large bandwidth, low time delay and high reliability, to avoid the difficulties of traditional communication network deployment, and makes in-depth research and comparison from two aspects of demand and technology to explore the adaptability of 5G communication and future medium voltage distribution network protection servicebearing.
Research on the Software of Planning Assisted Decision of Park Integrated Energy System
Authors: Zuo Gao , Zhang Chao , Teng Zhenshan , Wang Binbin , Wang Zhiguang
Published: January 2021

According to the characteristics of multi-demand of integrated energy customers, multi-faceted projects and complex technology categories, a decision-making software for integrated energy system planning is proposed. By constructing the investment income model of the energy system in the park, the software realizes the accurate planning of the capacity of the integrated energy system and the accurate evaluation of the investment income of the energy system, which provides the auxiliary decision support for the energy end users, the energy service providers and so on. The software realizes the intelligent optimization of the planning scheme through the optimization algorithm, and realizes the optimal planning capacity and investment income of the integrated energy system in the park. The software enriches the means of energy system planning and design, and improves the efficiency of planning.
Research on Transmission and Transformation Engineering Cost System Based on BIM 3D Modelling Technology
Authors: Luo Wei , Zhang Jiali , Wang Miao , Wang Kaikai
Published: January 2021

Taking the concept of service-oriented design as the concept, the paper designs the digital platform architecture based on the integrated application ideas and technical methods of the IFC standard and the three-dimensional geospatial engineering cost information platform, and builds a 3DGIS+BIM digital power engineering cost based on the B/S network architecture. information platform. Combined with the application value of BIM technology in the field of engineering cost, the applicability of BIM technology in the management of transmission and transformation engineering cost is first analysed; then the BIM technology is studied layer by layer from the aspects of graphical calculation, three-dimensional design and full process management Promoting strategies for application of engineering cost management; Finally, from the perspective of policy guidance, industry standards, BIM platform construction, and training of BIM talents, the application guarantee mechanism of BIM technology in transmission and transformation project cost management is proposed, with a view to BIM technology in transmission and transformation projects Provide reference for application promotion in cost management.
Research on Job Crafting Based on the Theory of Strength Perspective
Authors: He Yuanyuan
Published: January 2021

Post-90 employees have gradually become the main force in the workplace, and giving full play to their individual advantages helps them to understand themselves objectively and rationally, reshape their work behavior, and enhance their sense of work identity, sense of value and mission. Integrating the existing results of job crafting, we can find that job crafting based on the theory of strength perspective includes three levels: individual level, group level, and organizational level. While exploring the three levels of job crafting, this paper further constructs a theoretical model and proposes five implementation strategies, which have important theoretical contributions and practical value to the research on strength perspective and job crafting.
Static Wind Nonlinear Analysis of Iced Transmission Lines
Authors: You Yi , Zhang Long , Yan Zhitao , Nie Xiaochun , Wang Feng
Published: January 2021

The torsion of iced transmission line under the action of static wind will affect the configuration of its equilibrium state. This state is very critical for occur of the galloping. The beam element simulation method of iced transmission line is proposed. The stiffness matrix and mass matrix are derived, and the double nonlinear analysis method considering geometric nonlinearity and material nonlinearity is proposed. The static wind stability analysis of iced transmission line show that the aerodynamic nonlinearity caused by the shape is obvious. With the increase of wind loads, the torsion angle of conductor increases and the three component force coefficient changes, which leads to the nonlinear change of displacement and internal force response. At low wind speed, the iced conductor is more sensitive to the initial attack angle of wind, but at high wind speed, the conductor deformation is not sensitive to the initial attack angle of wind, and both will converge to the positive and negative values respectively.
Application of PLC-Based Stroke Control in Industrial Production
Authors: He Xiaodan , Chen Xiaosheng
Published: January 2021

According to the requirements of large-stroke and high-precision positioning control in industrial production, the paper proposes a position closed-loop control system based on belt-type magnetic scale and PLC. The Siemens S7-200 PLC is used to capture the high-speed pulses of the magnetic scale in real time, realize the closed- loop automatic positioning control of the large-stroke position, and apply it to the plastic steel profile sawing centre control system, which solves the traditional stepper motor open loop at a lower cost The accuracy problems caused by the control greatly reduce the threshold of precise positioning control, which has strong practical application value.
Research on Computer Network Risk Prevention and Control Technology in the Information Age
Authors: Guo Yue , Dong Liang , Zheng Lei , Qiu Shuang , Li Lei , Zhang Xianfei , Gao Hang , Zhang Yintie
Published: January 2021

With the advancement of global informatization, cyber risk has become an important factor hindering the informatization process, and cyber security issues have become the focus of public attention. Computer network security incidents include viruses, Trojan horses, worms, network monitoring, hacker attacks, malware, phishing, botnets, etc. In order to help netizens to prevent network security incidents more effectively, in response to the characteristics of network risk prevention data management, network Research and design of risk prevention database and data warehouse. At present, the development of computer technology is very rapid, but there are still many problems in the security of computer networks. Therefore, in order to avoid these problems hindering the development of the computer, the author analyses and discusses the technology related to computer network security protection in the information age, hoping to solve the computer network security problems and make the computer network more secure.
Correction Calculation of Influence of Back Pressure Change of Extraction Steam Condensing Unit on Unit Power
Authors: Zhang Yanpeng , Zheng Wei , Li Susheng , Zhu Lingkai , Li Si , Shang Panfeng
Published: January 2021

In view of the correction calculation method for the power of extraction condensing steam turbine without back pressure change at present, a simplified correction calculation method for the influence of back pressure on the power of extraction condensing steam turbine is proposed. This method can accurately calculate the influence of back pressure change on the power of extraction condensing steam turbine, so as to provide guidance for the economic operation of extraction condensing steam turbine.
Research on SSD Countersink Defect Detection Method Based on Machine Vision
Authors: Dang Lifeng , Zuo Wenyan , Shi Qin
Published: January 2021

Defect detection of counterbore plays an important role in SSD solid state disk panel automatic detection. Its goal is to accurately find and locate the defect location. At present, the detection of counterbores mostly adopts manual detection, which has the problems of low detection speed, high false detection rate and high missed detection rate. In this paper, the defect detection algorithm of counterbore is studied. After experimental verification, the improved algorithm expansion ⊕ closed operation and Blob analysis tools are finally used for image processing to ensure the integrity of the detection effect and further improve the accuracy of SSD counterbore detection.
Research on Fault Diagnosis Method of Electric Energy Metering Equipment Based on Expert System
Authors: Xu Hongwei , Li Pengcheng , Cong Zhongxiao , Pan Yi , Wu Zhanhe , Ren Xu
Published: January 2021

The realization of the full coverage of the smart meter and the metering automation terminal across the entire network brings great challenges to the operation and maintenance of the field. Aiming at the long-term problems of on-site failure operation and maintenance of the electric energy metering equipment, this paper combines the metering and collecting of failure types to analyse the main causes of equipment failure, based on the field topology structure for fault reasoning, and designs fault diagnosis and fault knowledge base as the core module for fault diagnosis. The expert system has been proved by practice that this method can effectively diagnose and solve the failure problem of the energy metering equipment, which is beneficial to realize the intelligentization of on-site fault diagnosis and improve the on-site maintenance efficiency of the energy metering equipment, and has practical reference value.
A Fault Diagnosis System Based on Case Decision Technology for UAV Inspection of Power Lines
Authors: Li Jianyang , Wu Hui , Hu Chunhua , Yu Chenglie
Published: January 2021

Though Deep Learning CNN is mostly used in UAV power line-inspection system for the application of intelligent image recognition technology, can design image features easily and has strong adaptability to complex environments, but three problems deafly influence the actual results of application system such as insufficient image samples library, scarce labeling samples, and absent open-data source. To conquer these problems, CBR is proposed as a strategy for knowledge reasoning, which transform the similar case-space to a new situation for problem-solving, so the combination of RBR and CBR is expected to construct our flexible case- decision diagnosis system, which integrates efficient machine learning methods to give their full advantages to guarantee the good performance of the system for fault detection. The on spot experimental results indicates our system performs efficiently, assist people in decision-making and can find potential equipment faults.
Research on Efficiency Improvement of High Frequency Transformer in UPS based on Maxwell
Authors: Zhang Peng , Wang Yue , Han Siwei , Liu Heqian , Zhang Jian , Liang Jianquan , Zhang Dewen
Published: January 2021

On-line UPS occupies a large proportion in today's standby power market due to its rapid dynamic response and clean power output. The bi-directional DC-DC converter can replace the directional DC-DC in both commercial mode and battery mode of UPS, and realize the sharing of power transformer, inductor and power switch components in two DC-DC circuits, so as to achieve the goal of large charging current, high power density and low cost. In UPS, the loss of magnetic components is the main factor affecting the efficiency of bi-directional converter. In order to improve the efficiency of bidirectional DC-DC, a high frequency transformer is designed. Maxwell software is used in this paper to simulate the transformer losses in different winding arrangements, so as to select the optimal winding arrangements, reducing the transformer winding losses and improving the converter efficiency. Finally, the prototype is made and debugged to verify the feasibility of the design.
Research on switching loss reduction technology for missileborne DC-DC power supply
Authors: Li Jun , Qi Wei , Wang Shulin
Published: January 2021

With the development of power electronics technology, DC-DC power supply is widely used in secondary power supply system on missile. How to restrain the loss caused by the periodical on-off of the switch tube plays an important role in ensuring the normal operation of the missile-borne power supply system. In this paper, the switching-tube Absorption Circuit and ZCT PWM soft-switching circuit are taken as the research objects, and the effects of the two circuits on the switching-tube loss suppression in the dual-pulse-width modulation mode are analysed, and a more effective method to reduce the switching loss of high frequency DC-DC power supply is obtained, it provides a reference for the further research of switching loss reduction technology in high frequency DC-DC power supply.
Analysis on Several Issues Concerning Sustainable Development of Urban Fringe Green Open Space in Chinese Megalopolis: Taking Three Types of Leisure and Recreation Projects as Examples
Authors: Ling Yang
Published: January 2021

Taking country parks, sightseeing agriculture and golf courses as cases, the paper analyzes the law of the emergence and development of green open space leisure and recreation projects in the fringe of megalopolis in China, based on building of a comparative model of the correlation between different project development stages and the economy and the analysis of the preference of three types of projects in the location of space, transportation and scenic resources. The results show that: ① The three representative recreation projects have basically gone through the "embryonic stage-accelerated development / upgrading transformation stage-sustained and stable development stage", as well as the different development stages of the three kinds of projects are related to some specific nodes of urban per capita GDP. ② The higher the degree of public welfare of the type of recreation project, the later the start and development, and vice versa. The emergence of golf courses is earlier than that of sightseeing agriculture, while the emergence of country parks is much later than both. At the same time, the non-public welfare recreation projects driven by market capital obviously have a more sustainable and strong development power than the public welfare recreation projects led by government investment. ③ The three types of recreation projects are consistent in the location of space, transportation and scenic resources, and are bound to face fierce spatial competition in the limited urban fringe of megalopolis. ④ From the three aspects of strengthening the development guidance of recreation projects, gradually optimizing the spatial layout of recreation projects and optimizing the allocation of traffic infrastructure, this paper puts forward some countermeasures and suggestions for optimizing the recreation utilization of green open space in urban fringe.
Synthesized and characterization of open-ended Ta3N5 nanotube arrays for the preparation of growth template
Authors: Hu Yanling , Yuan Ronghuo , Zhang Zenghui , Zheng Yufan , Ma Tongmei
Published: January 2021

In this article, a two-step anodization method was applied to tantalum foils to grow compact open-ended tantalum oxide nanotube arrays, which were subsequently subject to high temperature nitridation. The nitride nanotube arrays were characterized with SEM, XRD, and electrochemical tests including I-V and Mott-Schottky analysis. The phases in the nitrided nanotube arrays may consist of Ta3N5, TaN, TaN0.5, N-Ta2O, or the amorphous oxide. The duration of the second anodization step was found to play a key role on the microstructure and the carrier density of the nitride nanotube arrays. It is found that the duration of the second anodization has to be more than 20 min to obtain a specimen with a top layer of Ta3N5, which can work as a photo electrode or a template for the growth of photo catalyst nanomaterials.
Research on the performance of water-lubricated hydrodynamic spiral groove thrust bearing
Authors: Gan Xianming
Published: January 2021

Hydrodynamic spiral groove thrust bearing with water lubricated is widely used in precision instruments, such as motorized spindle. And its test research has always been a hot research direction. The purpose of this paper is to solve the difficult problems in the construction of the test-bed for hydrodynamic spiral groove bearing. The test-bed for hydrodynamic spiral groove bearing is designed, and the parameters such as axial stiffness coefficient, volume flow rate and friction torque are tested with the spiral groove thrust bearing as the research object. The general laws of the static characteristics of the hydrodynamic spiral groove thrust bearing are obtained, and the test-bed designed in this paper is verified it is practical in the test and research of hydrodynamic spiral groove thrust bearing with water lubricated.
Study on influencing factors of void fraction of asphalt mixture based on grey correlation
Authors: Lv Xiping , Liu Haijun , Li Shanqiang
Published: January 2021

grey relational analysis method has been widely used because it is applicable to small samples, irregular samples and has a small amount of calculation. For the study of shear compaction forming factors affecting air void of asphalt mixture, this paper studies a set of shear compaction meter uniform specimen preparation methods, and based on this through the grey relation analysis method the study type of asphalt, asphalt content, shear compaction times and fine aggregate level matching specimen void fraction, and it is concluded that the factors impact on the specimen void fraction size. The results show that the grey correlation method is an analytical method suitable for studying the influencing factors of the voidage of asphalt mixture. Among the influencing factors, the shear compaction times, the ratio of oilstone and the mass fraction of particle size <0.075mm are the three main factors affecting the voidage of shear compaction specimens. The research results have certain guiding significance for asphalt mixture design and construction quality control.
Predicting the Anti-Inflammatory Mechanism of Polygonum perfoliatum L based on Network Pharmacology
Authors: Zhang Mei , Huang Xulong , Xu Feng , Qin Ping , Din Qin , Fang Rongze , Wang Xiangpei , Wu Hongmei
Published: January 2021

Objective: To study the mechanism of anti-inflammation of Polygonum perfoliatum L by network pharmacology. Method: The active ingredients of Polygonum perfoliatum L were screened using TCMSP database, the active ingredients-target network and protein interaction network were established. The biological functions and pathways involved in the target were analyzed. Results: 11 active ingredients were obtained by screening. The network analysis indicated that the active components of Polygonum perfoliatum L involved 183 protein targets including Serpinel, Akt1, Nos3, Tnf, Casp8, Bcl2l1and multiple protein targets related to the MAPK signaling pathway, etc. The medicine had anti-inflammatory effects by regulating many signaling pathways such as PI3K-Akt signaling pathway, MAPK signaling pathway, Toll-like receptor signaling pathway, and HIF-1 signaling pathway. Conclusion: This study reflects the medicine multi-component-multi-target-multi-path therapy. It provides new ideas and new directions for further research on the mechanism of anti-inflammatory effects of Polygonum perfoliatum L.
Interaction effect of phenanthrene degradation on nitrogen transformation in heterotrophic nitrification and aerobic denitrification systems
Authors: Fan Lin , Zhou Bo , Sun Ran , Chan Jiangwei , Hu Sihai , Zhang Jianghua , Wu Yaoguo
Published: January 2021

The heterotrophic nitrification and aerobic denitrification (HNAD) system plays an important role in treatment of nitrogen pollution in water, and nitrogen transformation is closely related to carbon source. In this study, in order to explore the interaction between nitrogen conversion and phenanthrene degradation under the HNAD system, different concentrations of phenanthrene (0, 3, 6, 9 mg/L) were used as the typical and only carbon source of microorganisms, and different concentrations of ammonium nitrogen (0, 25, 50, 75 mg/L) and nitrate nitrogen (0, 25, 50, 75 mg/L) were used as nitrogen sources of microorganisms. The results showed that with the increase of phenanthrene concentration, the degradation rate of ammonia nitrogen gradually increased, which was higher than that of the control by 24.9%. With the increase of phenanthrene concentration, the inhibition effect was more obvious, and the denitrification effect was weakened. The addition of ammonia nitrogen and nitrate nitrogen accelerated the degradation of phenanthrene. As the increase of the concentration of ammonia nitrogen and nitrate nitrogen, the degradation rate of phenanthrene gradually increased. The degradation rate of phenanthrene can reach 100% and 98.8% when the concentration of ammonia nitrogen and nitrate nitrogen was the highest. This may be related to the fact that a large amount of inorganic nitrogen can promote the assimilation of microorganisms and accelerate the co-metabolism of phenanthrene degradation by microorganisms. In short, there was an obvious interaction effect between the degradation of organic carbon source and the conversion of nitrogen in the HNAD system.
Detritus processing based on intelligent metal detritus compression system
Authors: Xing Yan , Yang Yunpeng , Guan Yuanyuan , Fu Zhenyi , Gou Yue
Published: January 2021

Based on the automatic metal particles forming machine of treatment is all kinds of machinery manufacturing processing compressible metal shavings a way of processing, based on the actual production needs, intelligent choice of metal debris processing system, the corresponding equipment technical parameters and design to meet the basic mode of production of CNC machine tool chip compression, practice has proved that the sum up the results of the selection and design of metal elastic compression processing system has important significance.