bluuebunny/crossref_metadata_2025 huggingface dataset:
Improving the estimation of activation levels in flowing liquids under irradiation and decay
Authors: Pampin Raul , Cau Francesca , Fabbri Marco , Izquierdo Jesus , Portone Alfredo
Published: November 2020

A new methodological approach is proposed to calculate activation levels of flowing liquids under irradiation by coupling CFD analyses with activation physics. It overcomes the limitations of the conventional one, which assumes a simple linear dependency of residence times with flowrate that is only valid in a limited number of fluid-dynamic regimes. The new approach is more generally applicable and, as a consequence, successful in improving the post-analysis of a recent ITER water activation experiment. C/E values which with the conventional approach were very different from unity and showed a clear pattern with flowrate are now close to unity and showing a flat profile. Results are encouraging and suggest that the new approach leads to improved predictive capability for more complex applications in ITER and beyond. It is demonstrated that, under the particular conditions of the above experiment, the conventional approach always leads to under-prediction of activation levels downstream compared to the new one for the case of decay only, whereas it always leads to over-prediction for the case of irradiation and decay. The magnitude of the under- or over-predictions depends intricately on the actual flow patterns, flowrate and nuclide half-life.
Constructing the Industrial Prosperity Index Based on Big Data of Enterprise Electricity
Authors: Wang Jun , Tian Yingjie , Jia Fang , Zhang Shuaishuai
Published: November 2020

This paper is mainly based on the big electric power data of 5900 industrial enterprises above designated size in Shanghai. By combining a complex network and a hidden Markov model, the prosperity index of 164 medium-sized industries in Shanghai is constructed. Specifically, we use complex networks to describe the correlation between different industries, in order to mine the upstream and downstream drivers that affect industrial power consumption, and on this basis, consider the external factors that affect power consumption to establish a hidden Markov model that predicts changes in power consumption in the industry. Further, we use the state probability output by the Hidden Markov Model to define the industrial prosperity index, hoping that the index can fully reflect the economic operation of various industries in Shanghai and become a “barometer” and “wind vane” for economic development.
The Economic Load Scheduling Based on Particle Swarm Optimization
Authors: Chen Rongxuan , Zhao Ning
Published: November 2020

With the increasing cost of power generation, the economic load dispatching has been paid more and more attention. Considering the environmental temperature as the influencing factor of the economic dispatch of power plant load, it has a stronger adaptability to the working condition than the study that only considers the total load. In this paper, the application of particle swarm optimization in load economic scheduling was introduced. And combined with the actual operation data on two typical units, a comparative analysis was made on the load economic scheduling with and without environmental temperature. It was shown in the analysis results that the unit heat consumption rate decreases with the increase of total load and increases with the increase of temperature when the ambient temperature is taken into account or not. The unit heat consumption rate considering ambient temperature was always lower than that without ambient temperature. And as the temperature drops, the difference got bigger and bigger. The conclusion of the analysis has certain reference significance to the current load economic dispatching of power plants.
EOR Screening and pilot in YCAS Low Permeability Oilfield
Authors: Liu Peng
Published: November 2020

According to the reservoir characteristics and fluid characteristics of YCAS oilfield, combined with different EOR Process Screening, a method for enhancing oil recovery was selected for this oil field, and the polymer flooding parameters were optimized using numerical simulation software. The pilot test of the oil field shows that polymer flooding can greatly improve the oil recovery rate, which provides a reference for the efficient development of oil fields.
Effect of Low Temperatures on Battery Recharge and Discharge Voltage
Authors: Wang Hongwei , Liu Jun , Xia Defu , Fu Yanling , Zhu Yusong , Hu Bin , Tao Ziqiang , Xiao Haiqing , Deng Shuang
Published: November 2020

At a low temperature, due to its use of an organic electrolyte system, and its active substances having a poor electric conductivity as well, a lithium-ion battery will deliver a relatively poor performance at a low temperature, usually showing the symptoms of the common problem that individual batteries are consistent with each other better at a normal temperature, but showing a big difference in electric performance at a low temperature. Moreover, because of the effect of processing and fabricating techniques, the inconsistency among individual batteries in internal resistance also arises at a low temperature, which cannot be effectively detected at a normal temperature. Therefore, this article has studied the effect of low temperatures on battery recharge and discharge voltages. The results indicate that, with the decrease in temperature, batteries deliver a poor performance on discharge, the discharge curve shows an obviously downward trend, both average discharge voltage and discharge capacity fall somewhat, discharge capacity decreases remarkably, therefore the performance of batteries as a whole decreases faster, and batteries are noticeably less active.
Research on ZPW-2000A Track Circuit State Diagnosis Based on Set Pair Analysis
Authors: Zang Haoyue , Wang Ruifeng
Published: November 2020

For ZPW-2000A the traditional maintenance mode of uninsulated track circuit has some problems such as low efficiency and poor timeliness. This paper analyzes various index parameters that affect the running state of track circuit. Due to the influence of various random uncertain factors, such as the bad operation environment of track circuit equipment, the complex composition of equipment and the variety of fault causes, then the set pair analysis theory is introduced and the influence index is quantified by using the connection number. The degree of uncertainty is represented in mathematical form, and the expression of connection number between index and operation state is described systematically. The comprehensive and accurate state evaluation of track circuit is realized. Finally, an example is given to verify the effectiveness and feasibility of the proposed method.
Research on Liquid Cooling Technology and its Application in Wireless Charging
Authors: Liu Baojun
Published: November 2020

With the increasing thermal density and the limited installation space of wireless charging device, there are higher requirements for the external dimension and heat dissipation performance of wireless charging device. In order to improve the cooling efficiency of wireless charging device, combined with the disadvantages of traditional wireless charging device and air-cooled wireless charging device, the positive influence and Prospect of liquid cooling technology in wireless charging device are studied.
Present Statue and Development Trend of full-Scale Simulator for Drilling and Producing
Authors: Lv Zhenhu , Wei Yafang , Xiang Yingjie , Liu Jingtian , Chen Lu , Yu Weichu
Published: November 2020

Because it provides favorite ancillary support in terms of technology research and tools test, full-scale simulator for Drilling and Producing is still the focus for overseas researches. The test capability for full-scale simulator represents the level of development for national petroleum exploration and development. That the increasing efforts on unconventional oil & gas and deep water exploration brings new challenges to theory and technology for oil-gas exploration, so the full-scale simulator provides an intermediate bridge for theory and technology innovation. Following the tracks of the development of full-scale simulator, the overseas and domestic classify and development of full-scale simulator was analyzed, and identifying the main technical bottlenecks faced during it establish. This paper describes the development of key technologies for wellhead loading system, wellbore simulation technology and test monitoring system. On this basis, the research prospect for the full-scale simulator was forecasted.
Application of Intelligent Technology in Cold Storage Control System
Authors: Guo Changbao
Published: November 2020

With the development of my country’s economy, the application of intelligent technology of cold storage control system is more and more popular. The application of intelligent technology in the cold storage control system is conducive to the optimized operation of the cold storage. Not only can it reduce energy consumption, energy saving and environmental protection, but also has networked and humanized management in control management. Therefore, the cold storage control technology has developed rapidly. This paper analyzes the application of the current cold storage control system, and focuses on the application and development of the main intelligent technologies in the cold storage control system.
Application of Gas Lift Technology in High-deviated Well in NanPu Oilfield
Authors: Yin Qingguo , Jiang Xiaobo , Zhang Xiaochun , Wang Xiaoyan , Wang Qiuyue , Feng Rendong , Wang Zhensong
Published: November 2020

At present, the gas lift production technology used in conventional vertical Wells is basically maturing, but its adaptability of application is poor in high-deviated wells. The paper mainly aims at the technique challenges of gas lift production applied in high-deviated well, and the researches on some aspects such as the design optimization of gas lift, the mechanics analysis of downhole strings, the optimization of completion strings, and the research and development of completion tools and wire dropping& fishing tools. Finally, a set of gas lift production technology suitable for the application of high-deviated wells has been formed. This technology has been applied in 93 high-deviated wells in Nanpu 1-3 artificial island of Jidong oilfield with the design of gas lift coincidence rate 92%, string success rate 97% and success rate of gas lift put into production 100%. And gas lift production has been successfully realized in high-deviated and horizontal well in China.
Development of Ancillary Services in the Electricity Market of China and its Joint Market Optimization Model
Authors: Tang Chenghui , Qu Haoyuan
Published: November 2020

As an important part of power system, ancillary services have been widely developed. This paper introduces the ancillary service and its marketization trend in China. Considering the rapid development of China’s renewable energy, an optimization model for the joint optimization model of the ancillary service market and the energy market is established in this paper. The proposed model can effectively consider the electricity market with high penetration of renewable energy and is suitable for the future development of China’s electricity market.
Theoretical and Experimental Study on Nonlinear Flow Starting Pressure Gradient in Low Permeability Reservoir
Authors: Liu Hongtao , Zhao Tiany
Published: November 2020

In order to reveal the seepage characteristics of low permeability fluid in reservoir pores, the seepage mathematical equation of low permeability reservoir is derived based on the mechanical equilibrium equation. The characteristics and rules of oil and water seepage flow in low permeability reservoir are studied. The seepage process and starting mechanism are deeply analyzed. The starting pressure gradient is derived from its yield stress and surface force, and the boundary layer intensifies the nonlinear degree of seepage. In the actual reservoir development, the nonlinear characteristics of seepage should be fully grasped. The results show that the starting pressure is related to permeability and other physical properties such as viscosity and porosity.
Study on the Characteristics of UHV Negative Lightning Discharge in Tower-line Air Gap
Authors: Liao Zhenyu , Wang Haiyue , Yue Yishi , Zou Yanhui , Chao Yafeng , Wang Cheng
Published: November 2020

Research on the characteristics of UHV negative lighting discharge process in tower-line air gap is of great significance to the lightning protection of UHV transmission lines. Based on the physical mechanism of negative discharge in long air gap, a simulation model of UHV negative lightning discharge is established. According to the UHV negative discharge model, the relationship between the development speed of the leader, lightning current wave front time, gap length and breakdown voltage in the physical process of lightning development is studied and analyzed. The analysis results discuss the influence of the development speed of the positive and negative polarity leader on the simulation calculation, and the relationship between wavefront time, gap length and breakdown voltage is obtained through fitting.
Optimal Load Distribution of Power Plants Based on Linear Programming Method and Equal Micro-increment Method
Authors: Zhao Ning , Chen Ya-Mi
Published: November 2020

Optimal load distribution was an important way for power generation enterprises to save energy, reduce consumption and improve market competitiveness. At present, a lot of relevant studies had been carried out and many schemes have been put forward. In this paper, the application of equal micro-increment method and linear programming method in load optimization distribution was introduced. The results showed that the general trend of the two distribution methods was that the heat consumption rate of the steam turbine decreases with the increase of the load, and the change rate of the heat consumption of the steam turbine decreases gradually. At the lowest load, the difference between the two methods was the smallest. At 55% load, the difference of steam turbine heat consumption rate was the largest. Between 55% load and rated load, the difference between the steam turbine’s heat consumption rates was gradually reduced. The analysis conclusion had certain reference value to the current energy saving optimal scheduling.
An Analysis on Intelligence Innovation with Spirit of Artisans Under Ubiquitous Network in Grid Enterprises
Authors: Ni Hui-Jun
Published: November 2020

The paper discusses the relationship of spirit of artisans and intelligence Innovation. The survey shows that Intelligence Innovation has great contribution to organizational performance in an intelligent era. The survey from local state grid corporations shows that the interaction between the Artisan spirit and refinement process innovation under Ubiquitous Network in Grid Enterprises and organizational psychological empowerment acts as a significant moderator. This research provides useful tools for organizational intelligence innovation through the exertion of enterprise’ craftsmen examples.
Research on Speed Sensorless Control of Induction Motor Based on Back EMF
Authors: Hu Dan , Deng Xin , Zhu Wenbai
Published: November 2020

This article mainly uses the reduced-order model of induction motor (IM) to study the speed identification. Since the traditional voltage model (VM) and current model (CM) each have certain limitations, a general reduced-order model obtained by combining VM and CM is proposed for flux observation. This method is more conducive to analyzing system stability and determining gain, so that the entire induction motor vector control system reaches complete stability. In addition, for the full-order observer, according to the rapidity of current convergence, the back EMF can also be used to convert the full-order observer into an equivalent reduced-order observer. In this way, state feedback matrix can be avoided, which can greatly reduce the complexity of calculation and be more convenient to analyzing the stability of the system. Through the simulation of this novel back EMF reduced-order model, the feasibility of the system can be verified.
Study on the discrete analysis method of the factors affecting typical faults of Intelligent Electricity Meter
Authors: Shang Huaiying , Liu Yan , Zheng Angang , Qi Zhang , Xu Yongjin
Published: November 2020

Intelligent electricity meter represents the development direction of intelligent terminal of energy-saving smart grid end-user in the future. Intelligent electricity meters are widely used in the field, and the development momentum is rapid. In the future, the market demand is more vigorous, and the competition is increasingly fierce. However, in the practical application of electricity meters, faults may occur due to the influence of production enterprises, key components, research and development schemes, quality regulations, age of meters and other factors, even exposed batch quality problems, resulting in measurement disputes and customer complaints. In view of providing power companies and production enterprises with high batch early-warning for intelligent electricity meters to avoid economic losses caused by large-scale failures, based on the statistics of the whole life cycle data of 10 intelligent watt-hour meter manufacturers, this paper analyzes the typical fault types of intelligent watt-hour meter in detail, and obtains the analysis samples and dimensions of the main influencing factors. Based on the analysis method of standard deviation index, the multi-dimensional fault discrete analysis is carried out on the analysis samples, the dimension with the highest dispersion coefficient of fault is mined layer by layer until the smallest element is analyzed, and finally the main influencing factors of fault are obtained. The analysis results are basically consistent with the actual market performance of the production enterprise, which proves the rationality and scientific nature of the set of calculation indexes and discrete analysis method.
Three Dimensional Analysis Method and Application of Pressure Drop after Coal Seam Pressure
Authors: Peng Hongzhao , Kang Yunwei , Zeng Wenting , Sun Bin , Chen Dong
Published: November 2020

The analysis of pressure drop after compression is very important for obtaining coalbed gas reservoir parameters and optimizing coalbed gas fracturing design. However, there are some problems such as closed pressure analysis, inaccurate calculation of fracture geometry and effective permeability. In this paper, a three-dimensional analysis model of post-pressure pressure drop is established based on the principle of fluid volume balance during injection and closure. Based on the quasi-three-dimensional fracture model, the geometric size, fitting pressure and filtration coefficient of fracturing fluid are explained, and the practicability and accuracy of this method in the analysis of pressure drop after coal seam pressure are verified by field construction examples.
Research on Building Fire Risk Management Based on BIM
Authors: Zhang Hao
Published: November 2020

Based on the current building development needs and the existing problems of fire risk management, this paper analyzes the specific application of BIM technology in building fire safety analysis, and also puts forward the direction of thinking, and then builds a BIM-based fire risk management system model framework, which can provide references and ideas for the informatization and intelligent development of building fire risk management.
Port Container Throughput Forecast Based on ABC Optimized BP Neural Network
Authors: Huang Fucheng , Liu Dexin , An Tiansheng , Cao Jie
Published: November 2020

In order to improve the accuracy of port container throughput prediction, an improved ABC-BP prediction model based on Artificial Bee Colony (ABC) was proposed. With the advantage of global search ability and difficulty in local optimization, the weights and thresholds of Back Propagation (BP) neural network are optimized, and the optimal weights and thresholds in the network are finally determined. Referring to the existing research results, Qingdao 2014-2019 (24 quarters) GDP, port throughput, total foreign trade import and export volume were selected as network input, and Qingdao port 2014-2019 port container throughput statistics were used as network output, a total of 24 sets of data were constructed, so as to build a BP neural network prediction model. The first 20 groups of data were used as the training set, and the last 4 groups of data were used as the test set for instance verification. The results show that, compared with the traditional BP neural network and the BP neural network prediction model optimized by Genetic Algorithm (GA), the ABC-BP model can significantly improve the prediction accuracy of port container throughput.
Study on the Influence of Solid Medium Adsorption on the Migration and Transformation of Chlorinated Hydrocarbons in the Groundwater System
Authors: Zhang Shuaiji , Jia Ruibao , Sun Shaohua , Ma Zhenmin , Liu Shusen
Published: November 2020

In this paper, the pollution of chlorinated hydrocarbons in the groundwater system is taken as the main research object. According to the adsorption characteristics of chlorinated hydrocarbons in different aquifer media, carbon tetrachloride is taken as an example to carry out isothermal adsorption experiments under different solid medium conditions. The concentration data are obtained by fitting the standard curves of linear, Langmuir, Freundlich, and Temkin types to study the mechanism of chlorinated hydrocarbons in different media. The results show that the adsorption capacity of silty clay is greater than that of limestone at the same initial concentration. Therefore, before the pollutants enter the karst water, the silty clay will “intercept” the pollutants. However, once the karst water is polluted, the limestone medium has a small adsorption capacity, which will bring difficulties to pollution control and treatment.
Study on the Plant Diversity Under the Economic Fruit Forest in the Red Soil Erosion Area
Authors: Zhang Lichao , Yang Jiaqun , Ge Peilin
Published: November 2020

Navel orange garden and camellia oleifera forest are the most characteristic important economic industrial tree species in Jiangxi Province, and are mainly planted in mountainous and hilly areas. Because the species diversity of plants under the economic fruit trees is not rich, soil erosion and non-point source pollution are caused. Therefore, in view of the problems of soil erosion and nutrient deficiency under the economic fruit forest, this paper points out that the sustainable development of the economic fruit forest ecosystem can be promoted by increasing the plant diversity under the economic fruit forest, improving the ground cover of the conomic fruit forest, preventing and controlling the soil erosion, cultivating the soil fertility, restoring the biodiversity and promoting the sustainable development of the economic fruit forest ecosystem. At the same time, the future research and development direction of this field are discussed, which can not only provide scientific basis for the sustainable development of economic fruit forest industry in red soil erosion area, but also provide theoretical and technical support for the ecological construction of soil and water conservation and the development of ecological agriculture on slope land. It is of great significance for promoting the construction of ecological civilization in Jiangxi Province.
Basic Research on the Satisfaction of Building Indoor Personnel Based on Personnel Portrait
Authors: Xu Liangping , Wang Yaowu , Sun Pengcheng , Yang Chuanjun
Published: November 2020

During the operation phase, energy conservation of buildings gets much attention. Controlling methods are often based on physical parameters, ignoring the specific needs of different groups of people for the environment. To evaluate the current status, the questionnaire is used to investigate the relationship between personnel comfortability and various factors. This article aims to introduce the method of personnel portraits, balance the personality and common conflicts of the crowd, and solve the control problem of comfort that varies from person to person. Finally, combined with the analysis of the results of the questionnaire, a multi-faceted study of personnel satisfaction was provided to provide a reference for methods that can achieve energy-saving and satisfaction control at the same time.
Analysis of Groundwater Environment Evaluation and Prediction
Authors: Xiao Yuanhao , Zhu Lihong , Wu Yipeng , Zhao Xudong , Xi Junpeng , Chen Shun
Published: November 2020

In accordance with the requirements of Technical guidelines for environmental impact assessment―groundwater environment (HJ 610-2016), the process of groundwater environmental impact assessment and prediction was analyzed. Groundwater Model System (GMS) was used to simulate Groundwater flow field and solute transport, the following main conclusions were draw. As long as the project conforms to the specifications and design and the management is in place during operation, the production area and tailings area in normal working conditions will not cause obvious adverse effects on the quality of groundwater. Under different assumptions, groundwater pollution of the production area and tailings area in abnormal conditions will not directly affect the drinking water, farmland irrigation water and surface water of surrounding residents.
Study on Horizontal Well Over-replacement Fracturing
Authors: Jia Jiangfen , Long Changjun , Wang Xin , Zhang Hong , Tian Jianchao , Xu Zhengdong , Zhang Bin , Wang Peng , Ning Mengmeng , Kong Weizhong
Published: November 2020

Over-displacement technology often occurs in the fracturing process of horizontal gas wells. The effect of horizontal shale gas wells productivity with different fracture morphology considering over-displacement were analyzed by numerical simulation. The results show that the over-displacement productivity is only 12.3%-15.0% of the equilibrium displacement productivity considering the complete fracture closure, and the fracture morphology has no effect on the productivity. Therefore, the amount of over-displacement hydrofrac fluid should be minimized in horizontal gas well, the fracturing fluid can rapidly gel-break and flowback after fracturing, proppant can flow back or settle at the fracture seam, and complex fractures can be formed near the wellbore as far as possible, so that it can reduce the impact of over-displacement on productivity. This study can provide a theoretical basis for fracturing design and productivity prediction of horizontal gas wells.
Big Data Analysis on the State of Automotive Cabin Air Filters in China
Authors: He Yongao , Du Tianqiang , Wei Shuhong , Yin Wei , Tian Cheng , Li Chuanjie
Published: November 2020

Under the influence of the COVID-19, consumers pay more and more attention to the safety and health of the air in the car. As the core component of the air purification in the car, the performance of the cabin air filter is a hot topic for vehicle enterprises and parts enterprises. This paper introduces the inspection and data analysis of cabin air filter products in China by China Automotive Technology And Research Center, which includes the product geographical distribution, brand compliance rate, the compliance rate of different testing items. Based on the analysis of fractional efficiency of 0.3 μm, 2.5 μm and 10 μm particle sizes and particle sizes distribution in the atmosphere, this paper puts forward the view that it is necessary to pay more attention to the fractional efficiency of particulates which below 1 μm. In addition, the existing problems of cabin air filter are studied by data and its development direction is prospected.
Visualization Analysis of Sepiolite Research Progress in Recent Ten Years
Authors: Zhang Mengxin , Huang Hui , Li Ru , Xu Ruoyi , Li Qianwen , Jiang Luyao , Tao Shiying
Published: November 2020

The current situation and hot spots of sepiolite research were explored to provide reference for the further work in China. All literature related to sepiolite in CNKI database were searched in the past ten years. CiteSpace 5.6.R3 software was used to analyze the research situation from the perspective of the annual publication volume of key institution authors and other aspects in combination with the literature visualization function of HowNet. A total of 1084 papers were analyzed, and the overall number of publication was risen from 2010 to 2020. The research institute of Environmental Protection, Ministry of Agriculture, Hebei University of Technology, Xiangtan University were in the top list. The high-frequency authors were Xu Yingming, Liang Xuefeng, Qin Xu. Keyword analysis showed the main research hotspots were sepiolite adsorption and modification.
Static Mechanical Properties and Failure Modes of Layered Sandstones in Freeze-thaw Cycles
Authors: Chang Sen , Xu Jinyu , Wu Yunquan , Wang Tengjiao , Liu Gaojie , Huang He
Published: November 2020

Because the underground space in the alpine area is often in the freezing and thawing cycle state, as well as the layered rock is widely found in nature and the mechanical properties are complex, the mechanical properties of the lower rock in the freeze-thaw cycle are directly related to the development and utilization of the underground space in the alpine area. Based on the electro-hydraulic servo pressure tester, the static compression test of freeze-thaw damage specimen was carried out to study the strength, deformation, failure mode and anisotropy characteristics of the layered sandstone in freeze-thaw cycle condition. Also, the influence of freezing and thawing action and layered structure on the static mechanical properties and the mechanism of action were analysed. Finally, we obtained the following conclusions: The stress-strain curves of vertical and parallel bedding sandstones under freezing and thawing conditions can be roughly classified into compaction phase, elastic phase, plastic yielding stage and failure stage, and with the increase of freezing and thawing times, the peak stress and elastic modulus of layered sandstone samples decrease gradually; compared with vertical bedding samples, the mechanical parameters of parallel bedding samples deteriorate faster under freeze-thaw cycles; the deterioration of mechanical parameters of parallel layered specimens is faster under the condition of freeze-thaw cycle; the anisotropy index Rc of the intensity increased from 1.07 in 0 freeze-thaw cycle to 1.46 in 40 freeze-thaw cycles, and the intensity anisotropy became more significant as the number of freeze-thaw cycles increased.; when the number of freeze-thaw cycles is less than 10 times, the vertical bedding test specimen breaks the main crack at a certain angle (about 30°), showing shear failure through multiple bedding, while when the number of freeze-thaw cycles increases, the main crack tends to be parallel to the loading direction; parallel bedding samples always exhibit splitting failure along the bedding. The test results can provide theoretical support for the development of special underground space such as alpine and freeze-thaw areas.
“Sustainable growth” or “growth with pollution”—— research on economic growth patterns of industrial enterprise based on industry attributes
Authors: Yue Qin , Chen Jiameng
Published: November 2020

In recent years, protecting the ecological environment while developing the economy has become a widespread demand, but there is still a big controversy about the mode of industrial economic growth in China. This paper analyzes the growth pattern of China’s industrial enterprises by using the micro data of enterprises from 2011 to 2018. On the one hand, industrial enterprises without pollution fees show higher sales growth rate, and this phenomenon is more obvious in high pollution industries such as mining industry and smelting industry, which proves the existence of “sustainable growth” pattern; on the other hand, among the industrial enterprises that are levied pollution fees, those with more pollution fees have higher sales growth rates, which shows that there is still a phenomenon of “growth with Pollution” in some polluting enterprises. These enterprises evade the responsibility of protecting the environment by paying the pollution fees, and in exchange for the growth of the company’s sales at the expense of the environment. This paper provides a reference for further promotion of energy saving, and selection of sales growth pattern for highly pollution industries such as mining industry and smelting industry.
Evaluation Method Of Important Nodes Of Water Supply Network Under Terrorist Attack
Authors: Shun Chen , Xudong Zhao , Baoqiang Xiao , Yuanhao Xiao , Junpeng Xi
Published: November 2020

Aiming at the problem of urban water supply network protection under terrorist attack, a new comprehensive value evaluation method for important nodes of water supply network is proposed. Combined with the characteristics of terrorist attacks, Epanet and Aloha were used to simulate the changes in the efficiency of the water supply network and the consequences of secondary disasters after the node was destroyed, and a comprehensive value evaluation model based on the node’s own value, system value and indirect value was constructed. Taking an urban water supply network in Hubei Province as an example, the results can get the following conclusions: ①Compared with the buried water pipeline, the water supply plant as the source of the urban water supply network is the key target of terrorists; ②the calculation results show the comprehensive value of different water plants The gap is huge, and the comprehensive value of water plant 3 is nearly 5 times that of water plant 4; ③ the greater the comprehensive value of the water plant, the greater the terrorist attack revenue and the higher the probability of attack. Therefore, when responding to terrorist attacks, the comprehensive value should be High water plants provide more protection resources.
Study on Evaluation of Eco-city Construction Based on Sustainable Development
Authors: Yao Jiali , Yan Huihui , Shao Jun
Published: November 2020

According to the local development plan of Edinburgh, this paper establishes the evaluation system of ecological city construction, and combines the statistical data of 2014-2018, and uses the analytic hierarchy process and entropy weight method to calculate the index weight. the comprehensive evaluation of urban ecological construction in Edinburgh is carried out by the method of “model and sum”. The results show that the construction of ecological city in Edinburgh has shown an upward trend from the publication of the manuscript of local development plan in 2014, in which the construction effect has increased significantly from 2016 to 2017, and the evaluation value has reached the highest point. And then 2018 appeared a downward trend. Finally, on the basis of the evaluation of its implementation, discusses the enlightenment to the construction of ecological city and the realization of sustainable development in China.
Joint Optimization of Ship Sailing Speed and Container Handling Rate for a Near-sea Liner Service Route
Authors: Xi Jiang
Published: November 2020

This paper jointly designs the optimal ship sailing speeds on shipping legs and the optimal handling rates at ports of a near-sea liner service route operated by a container liner shipping company. A mixed integer linear programming model is developed, which can be solved directly by the commercial solvers to give a global optimal solution. The model is further applied to a real-life case. Results demonstrate that both bunker price and unit inventory cost affect the optimal ship sailing speed and the optimal container handling rate.
Anticorrosion Property of Chemically Bonded Phosphate Ceramic Coatings with Silica Sol
Authors: Zhang Yang , Liu Pai , Ding Zhu
Published: November 2020

To protect steel from corrosion in the service environments, a chemically bonded phosphate coating was successfully prepared in this study. The coating consists of aluminium dihydrogen phosphate, silica sol, aluminium hydroxide, silica, magnesium. Then, the microstructure and anticorrosion property of the coating were studied. By using XRD and SEM characterization, it is found that a crystalline Newberyite (MgHPO4·3H2O) and amorphous species formed in microstructure of coating matrix. The anticorrosion property was investigated by salt spray test, in which the coating was brushed on the surface of steel substrate in advance. Then, the anticorrosion property was carried out by an electrochemical test. Results indicated that the coating has an excellent effect in protecting steel substrate from corrosion. Because the compositions of the coating are water based, and it does not need any organic solvent, therefore the coating is both green and environmentally friendly.
Simulation Study on the Temperature Field of Iron-based Powder Metallurgy Friction Pair
Authors: Han Junjiao , Ning Keyan , Han Ming , Zhang Nan , Du Jianhua , Lang Zhaoyang , Liu Zhe , Liu Guimin , Ji Zhen , Jia Chengchang
Published: November 2020

For the iron-based powder metallurgical friction pair under high-speed braking conditions, the structural model and physical model of the friction pair were established, and the finite element software ABAQUS was used to calculate and analyze the temperature field and distribution law of the friction pair during friction braking. The results show that during friction braking, the temperature at the outer diameter of the contact surface of the friction pair is the highest, and the temperature at the inner diameter of the edge of the chip removal tank is the lowest. During braking, the temperature of friction pair increases first and then decreases with time.
Automatic Detection for Dam Restored Concrete Based on DeepLabv3+
Authors: Jun Zhang , Shiqiao Chen , Zhenhua Deng , yuan Zeng , Chabei Li
Published: November 2020

The concrete surface defects caused by various factors need to be repaired since the construction stage of the concrete dam. However, the binding strength between restored concrete and the original concrete will gradually get worse in the long run and appear some problems such as peeling. At present, the repaired concrete is mainly checked by the workforce, but it is time-consuming, inefficient, and hard to quantitative evaluate, such as the peeling area. A semantic segmentation method based on the DeepLabv3+ with ResNet50 backbone is proposed to restored concrete identification automatically. The dam restored concrete data set is established, including 372 high-resolution images to verify the method. The results indicated that the DeepLabv3+ model finally reaches 0.68 mIoU on the test set, which is a practical way to detect dam restored concrete.
Research on and Application of Roof Management Technology in 8.8m Ultra-high Fully Mechanized Mining Face
Authors: Qianyi Zhang , Tao Du
Published: November 2020

Aiming at the problems of high mining intensity and difficult roof management in a fully mechanized mining face with an ultra-high mining height of 8.8m, this article predicts the pressure parameters and rules of the working face based on the roof management technology of the 12402 fully mechanized mining face in Shangwan Coal Mine. The selection of the working surface bracket and the on-site roof safety management system are explained and analyzed. The results show that the analogy method can be used to predict the mining pressure parameters and rules of the working face to meet the needs of the application of large mining heights; the conventional techniques such as forced caving, “Scraped roof support moving method” and “Advanced drawing support method” are still effective under the condition of 8.8m mining height. The roof safety management system formed during construction guarantees the safe and efficient production of the ultra-high mining height working face, and provides a reference for the popularization of the mining technology of ultra-high mining height.
Hydrochlorination of Acetylene Using the Novel SiC Foam with Hollow Structure Supported Au/C Catalysts
Authors: Wang Peng , Yang Xiaodan , Gao Yong , Zhang Jinsong
Published: November 2020

Acetylene hydrochlorination using Au/C as catalyst, is an important process to produce vinyl chloride. It is a highly exothermic and diffusion-controlled reaction with local hot spots and poor diffusion process in the fixed-bed reactor, weakening the catalytic performance of Au catalyst. The structuring of catalyst using solid SiC foam ceramic can solve the above problems through optimizing spatial distribution of Au/C, reducing the pressure drop and temperature rise. In order to further disperse Au/C, the novel SiC foam with hollow structure was manufactured to compare with solid SiC foam. The hollow foam structured catalyst has inside and outside surface, thinner catalyst coating and smaller Au particles. Thus it provides more active site accessible to the reactants and further shortens the diffusion distance, then improving the catalytic efficiency. The catalytic lifetime (acetylene conversion above 90%) of hollow SiC foam structured catalyst is 205 hours while that of solid foam is 126 hours at acetylene gaseous hourly space velocity (GHSV) of 120 h−1. In conclusion, the better dispersion of Au/C on hollow SiC foam supported structured catalyst is the main reason for activity and stability enhancement.
Effect of ECAP Deformation on Microstructure and Properties of Pure Magnesium
Authors: Qin Tipeng , Ban Chunyan , Hou Xiaoze
Published: November 2020

In this paper, the effect of the deformation of equal-channel angular pressing (ECAP) on the microstructure and the mechanical properties at room temperature was studied under the extrusion temperature of 350°C and extrusion path of BC. The results show that the grain size of pure magnesium is obviously refined with the increase of the number of extrusion passes. The yield strength, tensile strength and elongation of the as-cast sample are 20MPa, 55MPa and 14.7% respectively. The yield strength and tensile strength of the 3-pass extrusion sample can be increased by 350% and 170%, respectively. The tensile strength and yield strength of the 4-pass extrusion sample are reduced compared with the 3-pass extrusion sample, but the elongation is further increased. The grain refinement of alloy ECAP process is mainly a combination of mechanical shear and dynamic recrystallization.
Calcination Effects of Fe Modified MoS2-Carbon Composites for the Improved Degradation Performances of Rhodamine B
Authors: Lv Peiyu , Ma Chao , Wang Dongxue , Liu Xuan , Hu Xudong , Zhang Tong , Cheng Xiangyin , Zheng Chunming , Sun Xiaohong
Published: November 2020

The pure MoS2-carbon composites (MoS2-C) and Fe modified MoS2-carbon composites (Fe/MoS2-C) were successfully synthesized through a facile two-step hydrothermal method by adding soft template of CTAB and applied as piezocatalysts to degrade Rhodamine B. The as-obtained catalysts were characterized by the X-ray diffraction (XRD) and scanning electron microscope (SEM). The results indicated the hybrids have large surface area, mesoporous structure, more edges and unsaturated S atoms. By comparing the muffle furnace samples (open air calcination) with the tube furnace one (closed Ar calcination), Fe/MoS2-C catalysts with tube furnace show the higher degradation activities (12.8% versus 5.8%). The possible degradation mechanisms are also discussed.
Study on the Influencing Factors of Mildew of Polycarboxylate Superplasticizer
Authors: Guan Mengqin , Yao Liangke , Lin Tianxing , Jiang Zhuojun
Published: November 2020

This article discusses the effect on the mildew of polycarboxylic superplasticizer under different environmental temperature, sealing conditions, reaction temperature, acid-ether ratio, initiation system and compounding with different dosage of sodium gluconate. The results of the study indicate that the polycarboxylic superplasticizer should be kept as tightly as possible when not in use. In the case of the same cost performance, it can be selected to appropriately increase the acid-ether ratio, the reaction temperature, and reasonably select the additives with bactericidal effect for production.
Demonstration of Suppressed Backscattering in Acoustic Valley Hall Topological Insulator
Authors: Han Xiangzhen , Li Li , Hu Yujin , Wang Xuelin
Published: November 2020

Acoustic topological insulators are at the frontier of acoustic metamatetials research. The analogue of the quantum valley-Hall effect (QVHE) in sound waves has led to acoustic valley Hall topological insulators (VHTIs). Here, we construct a new acoustic VHTI with C3v- symmetric hexagonal cells. The sound propagation along the interface is demonstrated via simulations. By introducing defects along the interface, such as cavity or bendings, we observe the robust transports to these defects in acoustic VHTIs. In addition, we construct several waveguides to quantitatively analyze the suppressed backscattering. The results illustrate that the new designed acoustic VHTIs in this paper possess better backscattering suppression in sound propagation, although the penetration is lower than the previously designed acoustic VTHIs.
Research Progress in Catalysts for Fatty Acid Ester Hydrogenation
Authors: Zhang Jia , Jiang Luyao , Huang Hui , Tao Shiying , Zhang Haojian , Xiao Xunwen , Fang Jianghua
Published: November 2020

Fatty alcohols and its derivatives have wide applications in industrial production and constitute one of the largest kind within the oleo-chemicals, and could be got by heterogeneous catalytic hydrogenation of fatty acids esters over suitable catalysts. The new progress in the efficiency supported copper, palladium, ruthenium catalysts and metal hydrides for fatty acid ester hydrogenation was reviewed, further development was also discussed.
Comparison of Stabinger and Glass Capillary Viscometer for Measuring Kinematic Viscosity of Unused Heat Transfer Fluids
Authors: Guo Linyuan , Kong Dexin , Feng Shichun , Rong Yan , Jin Dong
Published: November 2020

Kinematic viscosity is an important physical property of unused heat transfer fluids. This paper uses Stabinger viscometer and glass capillary viscometer method for testing unused heat transfer fluids’ kinematic viscosity and compares the results, in order to ensure the accuracy and reliability of the results. We tested the kinematic viscosity of the 85 samples. The analysis shows that Stabinger viscometer method can be applied to determine the kinematic viscosity of unused heat transfer fluids.
Research Progress on Numerical Simulation of Welded Joints Microstructure
Authors: Zhan Lan , Ma Zhen , He Xin , Li Bing
Published: November 2020

Since the integrity and mechanical properties of welded joints mainly depend on the solidification behavior of the weld pool and the microstructure characteristics of the welding heat affected zone, it is crucial for engineers and scientists to reveal the solidification behavior of the weld pool and the structural transformation of the welding heat-affected zone. With the dramatical improve of material calculation methods, the formation mechanism of the microstructure of some metal welded joints has been continuously revealed. In this article, the application of computer simulation in the study of welded joint microstructure is comprehensively analyzed. It focuses on the difficulties of simulating each area of welded joints, the advanced simulation methods applicable to each area and the current research status. Based on the characteristics of welded joint formation and simulation methods, some hot issues in research are proposed, aiming to provide effective help for researchers in related fields and open up new research ideas.