bluuebunny/crossref_metadata_2025 huggingface dataset:
Spatial scales and locality of magnetic helicity
Authors: Prior C. , Hawkes G. , Berger M. A.
Published: December 2019

Context. Magnetic helicity is approximately conserved in resistive magnetohydrodynamic models. It quantifies the entanglement of the magnetic field within the plasma. The transport and removal of helicity is crucial in both dynamo development in the solar interior and active region evolution in the solar corona. This transport typically leads to highly inhomogeneous distributions of entanglement.

Aims. There exists no consistent systematic means of decomposing helicity over varying spatial scales and in localised regions. Spectral helicity decompositions can be used in periodic domains and is fruitful for the analysis of homogeneous phenomena. This paper aims to develop methods for analysing the evolution of magnetic field topology in non-homogeneous systems.

Methods. The method of multi-resolution wavelet decomposition is applied to the magnetic field. It is demonstrated how this decomposition can further be applied to various quantities associated with magnetic helicity, including the field line helicity. We use a geometrical definition of helicity, which allows these quantities to be calculated for fields with arbitrary boundary conditions.

Results. It is shown that the multi-resolution decomposition of helicity has the crucial property of local additivity. We demonstrate a general linear energy-topology conservation law, which significantly generalises the two-point correlation decomposition used in the analysis of homogeneous turbulence and periodic fields. The localisation property of the wavelet representation is shown to characterise inhomogeneous distributions, which a Fourier representation cannot. Using an analytic representation of a resistive braided field relaxation, we demonstrate a clear correlation between the variations in energy at various length scales and the variations in helicity at the same spatial scales. Its application to helicity flows in a surface flux transport model show how various contributions to the global helicity input from active region field evolution and polar field development are naturally separated by this representation.

Conclusions. The multi-resolution wavelet decomposition can be used to analyse the evolution of helicity in magnetic fields in a manner which is consistently additive. This method has the advantage over more established spectral methods in that it clearly characterises the inhomogeneous nature of helicity flows where spectral methods cannot. Further, its applicability in aperiodic models significantly increases the range of potential applications.
Application of Diamond Wire Saw Cutting in Demolition of Large Reinforced Concrete Members
Authors: YI Jianhui , Liu Tao , Zhou Jie
Published: December 2019

With the rapid development of construction engineering and densely populated of urban buildings, it is impossible to adopt traditional methods for demolition construction due to the constraints of the surrounding environment. This paper combines the demolition engineering practice of the foundation pit support system of Jinyuan International Plaza, expounds the superiority of the application of diamond wire saw cutting in the demolition of large reinforced concrete members, and puts forward the effective construction operation points, which can provide beneficial for similar projects reference.
Development and Application of Dynamic Timing Optimization Platform for Big Data Intelligent Traffic Signals
Authors: Wang Zhao , Wang Mengjie , Bao Wenqiang
Published: December 2019

As the number of car ownership increases, road traffic flow continues to increase. At the same time, traffic pressure at intersections is increasing as well. At present, most of the traffic lights in China are fixed cycle control. This timing control algorithm obviously cannot make timely adjustments according to changes in traffic flow. In this case, a large number of transportation resources would be wasted. It is very necessary to establish a dynamic timing system for Big data intelligent traffic signals. In this research, the video recognition method was used to acquire the number of vehicles at the intersection in real time, and the obtained data was processed by the optimization algorithm to make a reasonable dynamic timing of the traffic signals. The test results show that after using the big data intelligent traffic signal dynamic timing optimization control platform, in the experimental area, the overall total delay time was reduced by 23%, and the travel time was reduced by 15%. During the off-peak period, the overall total delay time in the experimental region was reduced by 17% and travel time was reduced by 10%. The big data intelligent traffic signal dynamic timing optimization platform would improve the operational efficiency and traffic supply capacity of the existing transportation infrastructure, and could provide real convenience for citizens.
Carbon Footprint Study of Tesla Model 3
Authors: Gui Gensheng
Published: December 2019

With the application of life cycle assessment method, according to the life cycle assessment standard, the Tesla Model 3 life cycle GHG emissions are accounted applying the CALCM and GREET in this paper obtaining the following conclusions: firstly, the GHG emissions value per unit distance of Tesla Model 3 is 376gCO2e/km, 17% higher than the average GHG emissions of B class ICEV in China, attributing mainly to the high power consumption during driving.
Research on Overhead Line Cost Prediction Based on Index Construction
Authors: He Yongping , Liu Xiaomin , Yang Kai , Liu Shangke , Chen Yaxuan
Published: December 2019

In order to meet the growing demand of the society for electric power, the construction of electric power infrastructure is constantly carried out. However, investment in construction and cost control are particularly important. Because of its own characteristics, overhead line project cost control management is difficult to carry out. According to the characteristics of overhead line engineering, this paper constructs an overhead line engineering cost index system composed of 24 indexes including voltage grade from three aspects: technical conditions, engineering quantity attribute and cost attribute. Combining with the actual data of the completed project, the BP neural network algorithm is used to predict the static investment of the project. The accuracy of the prediction model reaches 99.9%. This verifies the rationality and comprehensiveness of the overhead line project cost index system constructed in this paper, and provides reliable guidance for the overhead line project cost management.
Optimization of Reactive Power Compensation Based on Fuzzy Mathematics
Authors: Lunzhu Dawa , Kui Tao , Ping Ni , Dunzhu Basang , Zhihua Dong , Feng Xu , Zhiyuan Pan
Published: December 2019

This paper proposes a heuristic method for optimization of reactive power compensation. Firstly, two fuzzy sets of node voltage and cost savings are formed. The compensation location with the greatest compensation suitability is obtained by fuzzy reasoning. Considering the operation modes of several different loads, the mathematical model of reactive power compensation optimization is established, and fuzzy multi-objective optimization is adopted. The method solves the fixed and variable compensation capacity, and calculates the compensation capacity for each existing compensation position cycle until the change does not occur. The above process is repeated until the new compensation position is no longer saved, and finally all the compensation positions, capacity and total savings can be obtained. The example analysis shows the effectiveness and practicability of the method.
Background Information Detection in Substations Based on Anomaly Detection
Authors: Li-Qing Ge , Jian-Feng Wang , Jing-Yu Teng , Ming Yang
Published: December 2019

The substations are important parts of modern electrical grids. In this sense, it is necessary to detect the anomaly and problems in it. In this paper, we study on the information detection in substations based on traditional anomaly detection algorithms. The data flow from the background information is represented by feature vectors. And those from the historical data are used to build the background references. Afterward, the feature vector of the input data flow is examined using the anomaly detection algorithm. Based on the results, the anomaly in the background information in the substations can be found and located. Then, some high-precision identification algorithms can be further employed to recognition the type of the problems. In this way, the problems occurred in the substations can be found and solved in time.
Research and Application of One-key Sequence Control Technology for Substations
Authors: Li-Qing Ge , Jian-Feng Wang , Jing-Yu Teng , Ming Yang
Published: December 2019

The substations are important parts of modern electrical grids. In this sense, it is necessary to enhance the management efficiency and robustness of the substations. The one-key sequence control technology system could simultaneously control several subsystems and make use of their functions to automatically operate the substations. In this study, three subsystems, i.e., monitoring subsystems, error analysis subsystem, and decision support subsystem are designed in the one-key sequence control technology system. All the background information from the substations is monitored, checked, detected to find the potential threats. The decision support subsystem provides suggestive ways to handle these problems. Therefore, through the reasonable use of the one-key sequence control technology, the overall effectiveness and efficiency of the substations can be enhanced. With the development of artificial intelligence technologies, the one-key sequence control technology system can be further improved with more powerful functions.
Research on Classification of Substation Background Information for Monitoring
Authors: Yang Wang , Heng-xuan Li , Shi-ping E , Kan-jun Zhang
Published: December 2019

The substations are important parts of modern electrical grids. The monitoring of background information in substations should be carefully managed to keep the smoothly operating of the electrical system. However, there are still some problems in present substations. As a result, some problems can not be handled efficiently and effectively. In order to improve the robustness of information monitoring of substations, this study first analyses the typical problems in the substations. Afterwards, several ways are proposed to handle these problems. As all the information in the substations are standardized, classified and automatically diagnosed, the occurred problems can be smoothly solved with high efficiency and effectiveness.
Virtual Submodule Predictive Control method for Power Electronic Transformer based on MMC Structure
Authors: Zhao Jinghong , Huang Xing , Zhao Honghao , Hong Xin
Published: December 2019

In order to achieve flexible and efficient operation of intelligent power distribution, solving the problems of traditional distribution transformer such as large volume and weight, easy to generate harmonics when overload, and need supporting protection equipment to protect it when failure, etc. We propose a power electronic transformer structure based on modular multilevel converter (MMC). Firstly, we consider the multi-dimensional control target of MMC converter to establish a mathematical model. Then a virtual submodule predictive control method is proposed. The method introduces the concept of virtual submodule to realize the optimal switching state rapid mapping and reduce the switching loss of MMC. Finally, the experimental results show that the mmc-based power electronic transformer has excellent dynamic steady-state performance and can effectively overcome the high loss of traditional predictive control.
Pattern Recognition of Partial Discharge by Using Scale parameters-Energy Entropy Characteristic Pairs
Authors: Dongchao Liu , Hui Xiong , Xiaotong Zhu , Lei Xu
Published: December 2019

In this paper, the complex wavelet transform (CWT) was used to process the ultra-high frequency partial discharge (UHF PD) signal in gas insulated switchgear (GIS) at different scales. The trend curves of complex wavelet transform energy entropy (CWT-EE) under different decomposition scale were analyzed, and it was found that the PD feature information mainly distributed in the scales, in which the gradient of CWT-EE is big. Besides, The CWT-EE characteristics and their scales were extracted to the structure characteristic pairs for PD type identification. The recognition results show that the characteristic pair could effectively identify four typical defects in GIS and obviously reduce the feature dimension.
Research on Application System of Three-Dimensional Design of Transmission Line Based on Grid GIS Cloud Platform
Authors: Yu Xinmin , Zhong Tianrong , Wang Xianri , Nie Kejian , Lv Jinglei
Published: December 2019

Intelligent integration has been basically achieved in transmission line design in developed countries, while the current management design level in this field in China is backward and inefficient. According to the characteristics of the pilot transmission line project, it is necessary to build a transmission line 3D design application system based on the grid GIS cloud platform with the advantages of webgl cross platform and without installing plug-ins, to assist in the application of transmission line 3D design, and to develop the interface with professional line 3D design software, so as to realize the smooth operation of GIS elevation and image information and other information such as line selection and capital collection. Experiments prove that the construction of transmission line three-dimensional design application system based on grid GIS cloud platform provides a set of simple, fast, convenient and intelligent and efficient three-dimensional design support for planners and designers. It is an effective means for modern power enterprises to improve management design level and work efficiency, and has great significance in economic and social benefits.
Environmental monitoring based on data processing of Internet of Things
Authors: Ivanov Alexander , Platov Alexander
Published: December 2019

The concept of online monitoring of the urban environment is proposed. It is based on the online processing of hydrometeorological and traffic information received through the Internet of Things. The traditional approach of the Internet of things includes transfer and storage of huge arrays of measurements in digital form. This concept of online monitoring is primarily an analysis, evaluation of the results of processing information received from wireless networks. The concept was implemented at Nizhny Novgorod State University of Architecture and Civil Engineering in several services including Eco-routes, Quite-routes, in which the air pollution of the urban environment by vehicle emissions and the noise level from traffic flows are estimated in real time mode. The calculation is based on meteorological data and traffic flow velocity. The calculation and assessment of environment pollution is carried out at the request of the user via Internet. The concept includes micro weather and algal blooming monitoring of reservoirs and ponds. Developed services is the first to provide free short time health risk assessment for both decision makers and common internet users.
Optimization Design of Thermoelectric Power Generation System of Waste Heat Recovery
Authors: Cheng Xiaoyu , Hu Huiqing , Bai Yunqing , Xu Gang , Hu Chongju , Li Yukun , Jiang Zhizhong
Published: December 2019

Considering that many parameters with mutual influence which were difficult to be considered comprehensively were involved in the optimization design of thermoelectric power generation system, a method that can calculate the optimal design scheme quantitatively according to the heat source characteristic was proposed in this work. The optimum working temperature of the thermoelectric module was determined by coupling the measured thermoelectric module performance curve with the temperature relationship of the cold and hot ends under the design condition. Then, based on the iterative method, the influence of various fin radiator structural parameters on heat dissipation performance was quantitatively analyzed by FLUENT software, so as to deliver the best combination of radiator parameters. The results showed that under the condition of constant heat flux density of 36 kw/m2, in order to obtain the best system efficiency, the cold end temperature should be controlled as 50 oC, and the fin radiator base thickness, fin spacing and fin height of the matched radiator should be 8 mm, 3 mm and 90 mm respectively.
CFD Analysis of Scaled Wire-wrapped rod Bundle Cooled by LBE
Authors: LYU Kefeng , SHENG Xuelei , MA Xudan , WANG Haitao
Published: December 2019

Lead bismuth eutectic (LBE) is one of the most potential materials for coolant for Lead based reactor and Accelerator Driven Systems (ADS). Thermal-hydraulic behaviour of LBE in fuel assembly is a key issue for development of the systems. To get a deeper understanding on the complex thermal-hydraulic features of wire-wrapped rod bundle cooled by upward LBE, CFD calculation based on RANS methodologies were also performed to support the experimental results analysis. The results concluded that LBE has the similar flow resistance characteristics with traditional fluids. Both the Rehme correlation and CFD showed a good agreement with the experimental results. As for the entrance characteristics, during the fully heating length (exceeding 140 times the hydraulic diameter), the thermal field did not reach a fully developed and stable condition which is contrary to the ducted flows. Based on the experimental results and CFD investigation of heat transfer coefficient showed that the hexagonal shell has a great influence on the heat transfer coefficient in rod bundle geometry. For this reason, the application of empirical correlation should be kept cautious in rod bundle analysis.
Analysis of movable guide vane inversion and limited block dropping of hydropower plants
Authors: Li Wenbo , Liu Lanlan , Wang Jun , Xiao Jian , Zhang Jun , Xie Yi
Published: December 2019

The fracture signal of shear pin occurs in the process of short time load reduction of AGC. During the stop site inspection, it is found that the shear pin was broken, the guide vane limit block fell off, and the movable guide vane was reversed. The analysis shows that the installation and welding mode of the limited block is wrong. Therefore, when the guide vane is subjected to additional load, the position of the fixed guide vane cannot be effectively limited, which leads to the inversion of the fixed guide vane.
Research on Power System Relay Protection Method Based on Machine Learning Algorithm
Authors: Fang Jingying , Zhang Xiangyun
Published: December 2019

With the development of power industry, there are gradually high permeability distributed energy systems. However, the existing relay protection is difficult to be effectively applied in this type of power system. To solve this problem, this paper applies machine learning algorithm to power system relay protection. Firstly, the structure of power system with high permeability and distributed energy is analyzed, and the challenges which current relay protection algorithms faced are introduced in detail. Then, the artificial intelligence algorithm is introduced, and the machine learning algorithm in artificial intelligence algorithm and its application in power system are mainly studied. Finally, the power system relay protection based on machine learning algorithm is deeply studied, and the specific implementation method and implementation flow are designed. The machine learning algorithm studied in this paper is helpful to the development of technology in the field of power system relay protection.
Study on the Development and Utilization of Renewable Energy in China
Authors: Ren Guizhou , Li Fangqing , Liu Gang , Ren JianXin , Liu Yudong , Shen Honghong
Published: December 2019

With the continuous consumption of fossil energy and non-renewable, countries all over the world pay more and more attention to the use of renewable energy, among which Denmark, Japan, Germany and so on are among the best. Based on the basic national conditions and the energy development situation of our country, the utilization of renewable energy in our country is also promoted to the national strategic position. Experience shows that large-scale renewable energy access to the power grid system can not only meet the electricity demand of industrialized countries. Moreover, the safe and stable operation of the power grid can be realized by advanced technical means. Through the analysis of some advanced technology and equipment research in the development and utilization of renewable energy in foreign power grid, in order to improve the repeatability of our country, The level of development and utilization of raw energy.
Development of Offshore Platform Stress Monitoring System based on Internet of Things Technology
Authors: Wu YongShun , Chen Demin , Xia Zhaodan , Yang Sujun
Published: December 2019

This paper mainly analyzes the main external load types of offshore platforms and the current status of offshore platform health monitoring technology. On this basis, a platform health monitoring system which is consist of a wireless sensor network and a satellite communication system is an typical application of Internet of Things Technology in the field of offshore platform monitoring. This paper has a detailed discussion of the overall system and key equipment. It has certain reference significance to engineers and technicians in related fields.
ENERGY EFFICIENT COMPOSITES USING NATURAL ORGANIC MATERIALS
Authors: Shalobyta N.N. , Tur V.V. , Shalobyta T.P. , Rakhuba V.I.
Published: December 2019

The increasing pace of human activities in the XX and XXI centuries led to a serious contamination of the planet by variety of production waste. Violation of the natural composition of air, quality of water, environmental degradation cause a number of irreversible pathophysiological changes in the human body, which justifies the need of cooperating activity of doctors hygienists and builders on creating an environmentally safe and comfortable human habitat Evaluation of environmental costs and environmental gains from the use of thermal insulation materials made it possible to identify the environmental advantages of natural cheap heat insulators. The use of natural fibers, as well as waste from plant processing, as reinforcing elements of composite materials is one of the most important research tasks of modern materials research.
Study on mechanical properties of a new type of prefabricated GRC mold shell
Authors: Dong Chen , Ming Chen , Ouyang Cai , Pengkun Li
Published: December 2019

The GRC formwork structural column adopts the factory-based vertical prefabrication production process, which can reduce the floor space, reduce the formwork loss, speed up the construction progress, promote the full decoration of the prefabricated building, and improve the efficiency of the assembly construction. major. In order to optimize the production process of prefabricated GRC formwork column, the overall stress system of GRC formwork structure is analyzed in the concrete pouring process, and the thickness of GRC formwork, the number of steel hoops and the GRC mode are considered. The influence of the shell cross-section size on the mechanical properties. The research results can provide reference for the optimization and design of prefabricated GRC formwork column production process.
Green Design in the View of Sustainable Development
Authors: Li Yan , Sun Zhenqing
Published: December 2019

With the continuous rising of economic benefits and the increasing innovation of science and technology, the relationship between human beings and natural environment is becoming more and more prominent. Especially after the world enters into industrialization, human beings plunder resources recklessly and destroy the stable cycle of ecological environment. In recent years, China has put forward the development concept of "not only the golden and silver mountains, but also the lucid waters and lush mountains are invaluable assets”. The 13th Five-Year Plan of China has established five development concepts: innovation, coordination, green, openness and sharing. The concept of "green" has been incorporated into the national strategic design, which highlights the harmonious development between human beings and nature, people and people. As the guider in the future, under the background of sustainable development, the green design takes innovation as the starting point, so as to become the permanent motive force of green development.
Selective Exploration and Experimental Research of a New Filling Cementitious Material
Authors: Xin Li , Lijie Guo , Wenyuan Xu , Wenchen Li
Published: December 2019

The method of stage vacant place and subsequent filling has been used in an iron mine in Anhui province, but the effect of underground filling with local cement dose not meet the requirements. Therefore, the cementitious material was developed which suitable for the actual situation of the mine. In this paper, the basic properties, fluidity of filling slurry and strength of filling body between local cement and cementitious materials are compared and studied. The experimental results show that the diffusion of filling slurry with new cementitious material is higher 37.93% than the filling slurry with local cement, and the compressive strength of filling body is higher 75.82% than the filling body with local cement. The testing indexes of the new cementitious material are better than the local cement. Therefore, the new cementitious material for mining can be well adapted to the cemented filling of tailings in this mine. Through the comparative experimental study in this paper, the data support and theoretical basis of performance evaluation and industrial application are provided for mine filling cementitious materials.
Traditional Coastal Settlements of Chaoshan Area Adapted to The Sand Ridge Landform
Authors: Pan Ying , Bai Jiayu , Shi Ying
Published: December 2019

Sand ridge landform is a kind of typical coastal natural landform in Chaoshan area. Through data review, historical satellite image collection, field interviews, archives search and other methods, the relevant data of the sand ridge landform area were collected, and comparative research methods were used to analyze the influence of such terrain on the Traditional settlement mode. A types of settlement patterns is summarized: the evolutionary pattern of settlements which are built on high ground and spread out to sea and that are adapted to the development of sand ridges landform. Through this case study, we hope to have a better understanding of the characteristics of the Chaoshan traditional settlements.
Study on Laboratory Experimental Pavement Performances of SEAM Modified Asphalt Mixture
Authors: Qingna Ma , Zhiqin Zhao , Qian Xu , Feng Sun
Published: December 2019

Adding sulphur dilution asphalt modifier SEAM to asphalt mixture is not only a modifier of asphalt mixture, but also an additive of asphalt mixture. When the modifier is added into the asphalt mixture, the road performance of the asphalt mixture can be improved. This paper studies SEAM modified asphalt mixture the Marshall property index, temperature stability, Water stability and fatigue feature in the Laboratory. On the based of the result of the experiment and analysis, SEAM can improve the high temperature stability, Water stability and fatigue feature. But the low temperature stability can’t improve.
Discussion on Green Building Design and Humanistic Care
Authors: Wu Shuhai , Liu Qing
Published: December 2019

Green building design is regarded as the key content of building design, which has been paid more and more attention in the development of the construction industry. Therefore, green building design is a new direction of architectural design development. Embodying humanistic care is the functional requirement of green building design in modern society. It’s crucial to study the correct direction of green building design and humanistic care development for the future of construction industry.
Application of low impact development concept in the construction of Shouxian County
Authors: Ding Kun , Xu Yang , Zhang Yi , Yang Chen
Published: December 2019

Low Impact Development (LID), also known as low impact design or low impact urban design and development, is a rainwater management method based on the principle of simulating natural hydrological conditions, using source control concepts to achieve stormwater control and utilization. Through the analysis of the current topography, meteorology, rainfall, and urban underlying surface of Shouxian County, the author finds out the cause of the county, and proposes to appropriately improve the design standards in the construction of municipal drainage facilities, and learn from the successful experience of sponge city construction in developed countries. The six-character policy of seepage, stagnation, storage, net, use and platoon is implemented in the engineering practice of the county-level recessed green space, rain garden, grass-growing ditch, infiltration pavement and water system remediation. Through several years of implementation, the phenomenon of sea watching in the county has disappeared, the water saving effect is obvious, the greening of the urban landscape has been greatly improved, and the social, economic and environmental benefits have been significantly improved
Analysis and Discussion on the Design of Green Super High-rise Civil Buildings in Huangshan
Authors: Jun Liu , Jinfeng Zhang , Qian Tu , Haowei Hu , Taotao Shui
Published: December 2019

With the accelerating urbanization process and the development of the construction industry, the role of green building design in architectural design is constantly reflected. The comprehensive implementation of green building is an important measure to promote China's energy-saving emission reduction and low-carbon city strategy. However, there are relatively few cases in which green building design is applied to super high-rise civil buildings, and in-depth research and data analysis must be carried out. The design points in green super high-rise civil buildings in Huangshan area were briefly summarized, and the actual cases of a green super high-rise civil building design in Huangshan City were analyzed, which is conducive to laying the foundation for the application of green building design to super high-rise civil buildings.
Study on Failure Law of Mining Process of Narrow Coal Pillars in Fully Mechanized Caving Roadway
Authors: Ren Haifeng , Zhao Xuewen , Cao Peng
Published: December 2019

In order to determine the damage law of narrow coal pillars in the roadway along the goaf, taking the 4-5(06) working face of a mine in Xinjiang as the research object, the 3D finite difference software FLAC3D is used to analyse the stress and displacement distribution characteristics of narrow coal pillars in the mining process. The results show that the internal stress of the coal pillar reaches the peak when the narrow coal pillar advances from 11m to 12m, and the coal pillar is subjected to the pre-supporting pressure, the range of the rupture zone is increased, and the bearing capacity is obviously reduced. When the working face advances 65m, the displacement in the coal column reaches a peak, and the deformation of the coal column is more serious. The field test results show that the damage law of the narrow coal pillars in the working face mining process is basically consistent with the simulation results. After the bolts, the cable-stayed anchor cable and the shotcrete, the deformation of the narrow coal pillar is in a controllable range, and the safety production requirements of the working face are realized.
Detection and Control of Radon and its Progenies in a Tunnel
Authors: Mao Hanyuan , Zhu Min , Wu Fei , Huang Huang
Published: December 2019

The presence of radon and its progenies in the tunnel directly affects the health of the staff. Effective measures should be taken to lower the concentration of radon and its progenies in the tunnel to reduce their harm to the human body. The article first introduces the investigation results of radon and its progenies in a tunnel, analyzes the monitoring data briefly, and then analyzes the application of ventilation, shielding and adsorption three kinds of methods in the control of tunnel radon, and gives some reasonable advice.
Construction of Backup Center for Enterprise Electronic Files Based on Cloud Platform
Authors: Wenjie Zhang , Wei Li , Chengming Jin , Shuo Chen , shanqi Zheng
Published: December 2019

The development in information technologies lies such as cloud platform provide good ways to improve the intelligence of present electrical enterprises. However, the massive data from the power stations and systems should be properly stored to avoid the sudden breakdowns of the system. Therefore, it is meaningful to construct the data backup center for all the data in the enterprise. The main objective to the properly manage and analyze these data to find and solve the potential threats in the enterprise system. This paper analyses the main functions of the data backup center and provides some potential ways to build it with high intelligence and automation level. By using stable facilitations, intelligent information classification modules and automatic anomaly detection tools, the data backup center could help the smooth operating of the whole enterprise.
Development and Application of Live Replacement of Insulator Suspension Tool Components for Transmission Lines
Authors: Jun Ma , Liang Yu , Yonggang Shi , Gang Dong , Fuxing Gong , Kegang Wei , Xin Su , Yushuai Ren
Published: December 2019

Transmission line insulators will reduce the insulation level and become low-value insulators because of lightning flashover. Toughened glass insulators are used in 500kV Tongfeng 1 and 2 lines in Tonghua area. Most umbrella skirts will break and fall off after lightning flashover, which greatly reduces the insulation performance. It needs to be replaced in time, but frequent blackouts will bring great losses and reduce the reliability of power supply. Aiming at the frequent lightning hazards and lightning strikes on transmission lines in Tonghua area, a tool assembly for live replacement of insulators for transmission lines is developed. Through the application of this tool, the live operation mode is adopted to eliminate such defects. The operation time can be arranged and implemented in a very timely manner, which avoids the threat of long-term defects, effectively reduces the outage time of equipment, enhances the stability of power grid, and greatly improves the reliability of power supply of lines. Finally, taking the live line insulator suspension tool as an example, the economic benefit analysis is given, and the feasibility and correctness of the tool are verified..
Comprehensive Classification of Urban Agglomeration Types in China
Authors: Huang He , Guo Lei , Wang Jingyan , Huo Molin , Liu Lan
Published: December 2019

Urban agglomeration is not only an important carrier of China's new urbanization strategy, but also a new regional unit for the country to participate in global competition and international division of labor. At present, China's regional spatial governance model is undergoing a major change, from the original administrative division management to the type of regional spatial governance. Based on the important extension characteristics of urban agglomerations, this paper classifies 23 urban agglomerations in China with the idea of comprehensive classification, and obtains the index system and clustering results of type classification, which provides scientific basis for the planning guidance of spatial pattern optimization and classification management of urban agglomerations in China. Referring to the scale and degree of agglomeration of mature urban agglomerations in the world, based on the four characteristics of urban agglomerations, the index system is constructed. Fuzzy C-means clustering (FCM) method is used to quantitatively classify Chinese urban agglomerations into five types.
Parameter optimization of double side wall method for soft surrounding rock tunnel
Authors: Yang Zhihua , He Rumiao , Li Ke , Guo Hongyan
Published: December 2019

When the Xiaojiazhai tunnel is constructed by the double-wall method, different curvature radii have different effects on controlling the stability of the surrounding rock and speeding up the construction progress. By numerically simulating the tunnel excavation under different radius of curvature, it is concluded that R is adopted respectively. The deformation displacement of surrounding rock is =11.6m∠520 and R=5.76m∠1060. The maximum horizontal displacement and vertical displacement are smaller when R=5.76m∠1060 is selected. According to the analysis results, when R=5.76m∠1060 is selected, the deformation of surrounding rock can be controlled to ensure the safety of construction and provide reference for future construction.
Sensitivity analysis of ground settlement induced by pipe-jacking construction in soft soil stratum
Authors: Han Xianmin , Li Wenjiang , Chen Tao , Liu Wang
Published: December 2019

Taking the ground settlement while pipe-jacking construction in soft soil as the engineering background, the effect of pipe jacking were studied by numerical simulation. It focused on the factors that mainly influenced surface settlement of ground including in-situ stress release rate (or ground loss ratio), chamber pressure, elastic modulus of soil, buried depth and diameter of pipe. That would provide theoretical basis for taking measures to reduce surface subsidence while jacking. The main conclusions were as follows: (1) The in-situ stress release rate and pipe diameter were proportional to the surface subsidence. (2) Chamber pressure, elastic modulus and buried depth were inverse proportional to the surface subsidence. (3) From the point of view of the influence on surface settlement, the sensitivity of pipe diameter and elastic modulus of soil was the greatest, followed by burial depth and chamber pressure, and the stress release rate was the smallest.
Application Research of Ground-Penetrating Radar in the Quality Inspection of Concrete Anti-seepage Panels
Authors: Li Meng , Ren Changde , Zhao Lei , Luo Shijiao
Published: December 2019

If the sand-free cushion of concrete anti-seepage panels of reservoir is void, it will cause local instability or even crack and collapse of the panel, which will lead to large leakage of reservoir and affect the safe operation of the project. In this paper, the ground-penetrating radar (GPR) method is used to scan the concrete panel. The results show that the quality of the panel is good overall, the distribution of rebar is uniform, and the contact between the panel and the sand-free cushion is dense. Some panels have internal voids and the contact between the cushion and the rock foundation is not dense, while no obvious hollowing is found in the sand-free cushion.
Application of Smooth Blasting in Yazhugou Tunnel
Authors: Wang Xiaolin , Yin Wei
Published: December 2019

This paper takes Yazhugou Tunnel, a highway project in the upper reaches of the Yalong River as the example to summarize the application of smooth blasting in the Yazhugou Tunnel from the aspects of the feasibility, resource allocation, blasting parameters, drilling and blasting technology and the guarantee measures, with the construction characteristics of the tunnel blasting, the type of surrounding rocks, construction technology and cost taken into consideration.
Developers' Competition Behaviour of Land Reserve in Assembled Buildings Development: Based on Game Analysis Framework
Authors: Luo Gangqiang , Wang Qin
Published: December 2019

Based on the perspective of game theory, this paper studies the land reserve competition behaviour of developers in assembled buildings development. This paper studies in detail the land price decision in the unilateral equilibrium model of land market, the lending strategy of commercial bank executives under the banking supervision system, the bank credit demand of developers hoarding land, and the bilateral equilibrium model of credit-land market under the loan game of bank executives. The results show that the equilibrium price of land is positively correlated with the number of developers, the total amount of bank loans available to developers and the basic price of land. There is a positive "vicious" circular transmission mechanism between land price, marginal private interest of bank executives' lending and bank financial support.
Progressive Collapse Analysis of multi-story building under the scenario of multi-column removal
Authors: Nassir M. , Yang J. , Nyunn S. , Azim I. , Wang F.L.
Published: December 2019

Recent studies regarding progressive collapse resistance of buildings considered only single critical column removal scenario. However, limited investigations have been conducted so far to assess multi-column removal scenarios. Hence this study is made to compare progressive collapse resistance of a multi-story building under both single and multi-column removal scenarios. An eight-storey reinforced concrete building was analyzed by using linear static analysis procedure and DCR values of the members are calculated to investigate the potential of progressive collapse as per GSA guideline. The values of DCR are compared for different cases. Comparisons of single and multi-column removal scenarios reveal that later scenarios are more critical because of their higher demand capacity ratios, and it is more critical when both corner and exterior columns are removed.
Repair Technology for Joint Damage of Sealing Cover Plate of Concrete Faced Rockfill Dam
Authors: Cui Zhigang , Sun Zhiheng , Li Meng , Liu Jincheng
Published: December 2019

In view of damages that are common in anti-seepage coiled joints used in the water-sealing of the concrete faced rockfill dam junction surface, the construction method that uses SK hand scraping polyurea and tire base fabric to quickly repair the broken coiled joint is proposed. By polishing the surface of the commonly-used Ethylene-Propylene-Diene Monomer (EPDM) board coiled material and using a special BU primer, good adhesion can be ensured between the SK hand scraping polyurea and the EPDM board. The EPDM boards were joined by docked joints and lapped joints, the boards were coated with SK hand scraping polyurea and adhered with tire base fabric, and the tensile and peel tests are carried out. The results show that SK hand scraping polyurea and EPDM board is well bonded. The method using for the connection of EPDM board joints has the advantages of simple construction, high speed, good quality and good anti-seepage effect, and it has been successfully applied to repair of damages of concrete faced joints on Pushi River pumped storage power station in Liaoning and the Nazixia hydropower station in Qinghai.
Analysis and study on static load test of box girder bridge in mining area under special load
Authors: Yuan Shengtao , Zheng Weilong , Chen Shunchao , Hu Chuanwen , Luo Wenbo , Xie Shoufu
Published: December 2019

In order to evaluate the stress condition and working performance of a box girder bridge in a mining area under the special load of 100T, through static load test, the mechanical properties of the bridge under operating conditions were analyzed and studied. Static load test is the stress test of the main beam under the partial and medium load, finally, the measured results are compared with the finite element result. The results show that under the action of various loads, the check coefficient of the bridge strain and the main tensile strain check coefficient was not exceed the standard allowable value 1, the actual working performance of the structure is very good, the maximum relative residual strain was 8.33%, which are not 20% higher than the standard allowable value, the whole bridge is in the elastic deformation stage, meet with the normal use requirements.
Experimental study on horizontal bearing capacity of enlarged cap-group pile composite foundation
Authors: Chen Taihao , Xu Yiming , Chen Jie
Published: December 2019

In order to provide reference for the engineering design in the area with large wind, water flow and other horizontal loads, the experimental study on the horizontal bearing capacity of composite foundation under three different working conditions was carried out in this paper, which includes cap-single pile, cap-9 piles and enlarged cap-9 piles. The results show that under the condition of cap-9 piles, the group pile effect coefficient is 1.17, and the load sharing ratio of the back piles is the largest, and the middle and front piless decrease sequentially. Also, with the increase of horizontal load, the load sharing ratio of the back pile increases while the middle and front piless is decremented. Under the condition of enlarged cap-9 piles, the group pile effect coefficient is 1.36, which is 16.24% higher than that of the cap-9 piles, which means the horizontal resistance is obviously enhanced. At the same time, compared with the cap-9 piles, the load sharing ratio of the back pile is reduced while the middle and front piless is increased, which means the stress of pile body tends to be more uniform.
Study on stability analysis of gravity wharf structure in Fujian
Authors: Zhang Jiaying , Li Bin
Published: December 2019

Gravity wharf is a common structure form in port engineering, and it is appropriate for rock foundation or the area of shallow buried bearing stratum. In this paper, stability analysis of gravity wharf and breakwater structure under seismic load in Fujian is studied, the potential factors of instability and corresponding repairing measures are put forward. These results have important significance to ensure the port operation safety and economize investment.
Urban Design of Old Town from the Perspective of Context Continuation
Authors: Zhang Xiaoxiao , Yan Jianxiong , Liu Renyi
Published: December 2019

The current urban development in China has generally entered the stage of urban renewal. Facing the urban mix of old and new, different forms of collage picture, the urban design exploration of continuing the urban context has important theoretical value and practical significance for the urban renewal of the old urban area. Based on the analysis of the explicit and implicit context, this paper raises six strategies for urban design in the old city, namely texture improvement, building integration, interface reconstruction, information implantation, functional compounding, and benefit balancing. As an empirical evidence, the urban design of the old city further discusses the importance of the continuity of the context for urban renewal in the old city.