bluuebunny/crossref_metadata_2025 huggingface dataset:
Research of land engineering and soil classification from the perspective of Geological Sciences
Authors: Cheng Jie , Yang Liangyang , Wu Dan
Published: July 2021

In order to speed up the construction of land science, solve land problems and promote the sustainable and rational development and utilization of land resources. In this paper, we start with recognizing the existing problems of land resources, discuss the subject construction of land engineering, and discuss its core research. The results show that there are some problems in the land resources, such as the continuous expansion of land desertification area, serious soil erosion and soil pollution; In order to solve the land problem, it is proposed to speed up the construction of land engineering discipline and vigorously carry out the research work with the organic reconstruction of soil as the core.
Research on Cooling Effect on Heading Face of Spray by CFD in Metal Mines
Authors: Li Chen , Chen Guowei , Zhang Teng , Zhao Yanyang
Published: July 2021

In order to study the treatment of mine heat disaster and improve the thermal environment of heading face. Taking the heading face of a metal mine as the research object, a physical model is established, and the temperature distribution of the heading face is numerically simulated by using computational fluid dynamics (CFD) software. The results show that spray can significantly reduce the temperature on the heading face. It provides theoretical guidance for the spray device in the field of mine thermal damage control.
Research And Analysis on Anti-Cracking Performance and Hydration Heat of Shear Wall in Cold, Dry and Windy Area
Authors: Luo Fajiang , Luo Zuoqiu , Meng Zhaohu , Han Guangzhao , Liu Manqing , Huang Fajing , Zhang Dafa , Wu Shixian , Tong Xiaogen
Published: July 2021

Gansu Province is located in a cold, dry and windy area. The whole province is dry with little rain, large temperature difference between day and night, and long cold time. The quality of raw materials used for concrete is unstable, and cracks exist in all kinds of building concrete walls, which has a great impact on the quality and forming effect of buildings, and there are many types of concrete cracks. In order to improve the problem of concrete cracks, we need to start from the causes of concrete cracks. The most effective way to control and reduce concrete cracks is to correctly judge and analyze the causes of concrete cracks. Through the study of concrete: raw material properties, mixture properties, mechanical properties and other factors and the relationship between cracks. At the same time, two kinds of structural measures are added in the construction site, i.e. reinforcing mesh and concrete curing method, to study their influence on concrete cracks.
Experimental Study on the Boundary of Karst Spring Basin: Take Ji’nan Spring Basin as an Example
Authors: Zhang Manqi , Shu Longcang , Du Xiaofeng , Han Gang , Chen Yuan
Published: July 2021

The accurate determination of spring area boundary position and boundary property is an important link to establish a correct hydrogeological conceptual model, and is the fundamental guarantee of the accuracy of groundwater resource calculation results in the spring area. In view of the two perspectives of the east-west boundary of Jinan spring basin, the sand tank model of the fault-watershed region was built based on the characteristics of karst aquifers. The experimental scenarios were dominated by changing the precipitation intensity and duration time. The experiment results under different scenarios were analyzed and the characters of the boundary were preliminarily investigated. The results show that about 30% ∼ 40% of the atmospheric precipitation is converted into surface runoff, and 50% ∼ 60% of that is converted into fissure karst water. The water balance can be correctly calculated only by accurately identifying the water flow direction and amount of sources and sinks of the region.
Sensitivity analysis of advanced cement-based grouting parameters in tunnel soil structure
Authors: Zhang Hongbin , Wang Shuai , Ma Shuai , Liu Gao
Published: July 2021

Advanced support is the key measure for tunnel passing through the weak broken surrounding rock. As a common advanced support method, advanced small conduit grouting technology can improve the physical and mechanical properties of rock mass, enhance surrounding rock parameters, and effectively suppress the deformation of surrounding rock. Based on a diversion tunnel project in the west of China, this paper comprehensively evaluates the sensitivity of the physical parameters of grouting reinforcement based on the multi-factor sensitivity analysis method, in order to provide reference for the optimization of advanced grouting reinforcement scheme.
Study on Underwater Anti-washout Concrete in Sediment Environment for Offshore Engineering
Authors: Shang Ningning , Kang Shaowei , Cui Cancan , Han Zhongzhi , Zhou Wei , Guo Xiaojun
Published: July 2021

The close packing theory is used to optimize the cementitious material system of ordinary underwater anti-washout concrete, and the performance of the prepared concrete is verified through experiments. The test results show that the tightly packed underwater anti-washout concrete with C40 mix ratio is cured under the condition of seawater curing., 7d compressive strength of 31.4MPa, 28d compressive strength of 55.3MPa, 56d compressive strength of 68.7MPa, electric flux of 860C, meeting the requirements of marine engineering concrete’s mechanical properties and resistance to harmful ion erosion.
Study on Dynamic Adjustment Method of Power Grid Critical Peak Periods Considering Load Characteristics
Authors: Liu Dunnan , Li Hua , Wang Lingxiang , Zhang Tingting
Published: July 2021

In order to promote the effective implementation of the critical peak pricing (CPP) mechanism, it is necessary to study the dynamic adjustment method of critical peak periods. In this paper, a dynamic adjustment method of critical periods based on FCM algorithm is proposed. First, the peak day of the peak month is selected according to the peak load. Then based on FCM algorithm, the peak periods of peak day are redivided into critical peak periods and peak periods. Finally, the effectiveness of the method is verified by a numerical example.
Research and Application of Construction Method of Power Grid Dispatching Professional Corpus
Authors: Zhang Yue , Hai Wei , Hao Feng , Shan Lianfei
Published: July 2021

The existing word segmentation tools are difficult to effectively segment the scheduling professional corpus, which leads to the problem of limited application of scheduling professional corpus. A method is proposed for constructing a professional corpus for power grid dispatch based on natural language processing and artificial intelligence technology. Faced with data of various structures and forms, the different methods are applied to establish the recognition model for scheduling professional corpus. The scheduling professional corpus is recognized in database and document table based on rule mask. The entity recognition and relation extraction technology are used to extract professional corpus in text. The scheduling instruction corpus is formed by determining the operation intention and slot of the dispatcher. Finally, the similarity between the scheduling professional corpus are calculated based on the text similarity algorithm, and the semantically identical corpus is formed into a mapping relationship. The application results show that the automatic speech recognition model based on the scheduling professional corpus has higher recognition accuracy and is suitable for practical applications.
Cause Analysis and Treatment of Slurry Foaming in Desulfurization Absorption Tower of 300MW Unit
Authors: Wu Jianxun , Xue Fangming
Published: July 2021

In view of the serious slurry foaming and overflow problems in the flue gas desulfurization system of a company in Shandong, the causes were analyzed and improvements were made on the basis of the original process. The results show that the inadequate combustion of the intermediate ash of the boiler and the high concentration of organic matter in the desulfurization process water are the main reasons for the slurry foaming; after improving the boiler operating conditions and adding defoamers, the boiler fly ash contains carbon The circulating pump current returns to normal levels, the desulfurization efficiency is increased from 97.2% to 99%, the power consumption of the circulating pump is reduced from 380 kWh to 316 kWh, and the moisture content of desulfurized gypsum is reduced from 16% to 9.5%.
Research on Video Detection Method of Moving Target Oriented to Substation
Authors: Tian Ye , Yu Cunzhan , Xie Fei , Gao Song , Ru Manhui
Published: July 2021

With the promotion of unattended substations across the country, intrusion detection technology for people in important areas of substations has become an important research area. This article focuses on the problem of personnel entering important areas of substations for the purpose of man-made destruction, and proposes an improved two-frame difference method A moving target detection method combined with the background subtraction method. This method is based on the two-frame difference method, taking into account the impact of changes in illumination, and avoids the image sequence by combining the difference map of the background subtraction method and the two-frame difference method. The “double shadow” phenomenon caused by the difference method can also avoid the situation that the background subtraction method misjudges the sudden change of light as a moving target, improves the recognition accuracy, and can meet the real-time requirements of the substation intelligent monitoring system.
Wind Turbine in Renewable Energy System in Navigation Technology
Authors: Zhang Rongjun
Published: July 2021

Advances in science and technology promote the use of more equipment in marine engineering. This equipment will undoubtedly increase energy consumption significantly. If only solar energy is used for charging, it may be able to charge in time to meet the demand when the sun is sufficient. In case of rainy weather, it will cause the navigation mark battery not to be charged in time, causing the equipment on the navigation mark to fail to work normally. For this reason, offshore wind power, as a renewable energy source, can make up for the lack of solar power for marine projects. In view of this research background, the paper studied the coherence effect between the blade and the tower wind field based on the wind turbine structure characteristics and the random wind power spectrum characteristics, and proposed the harmonic superposition method (HSMBTI) considering the interaction between the blades and the tower. This method is used to numerically simulate the random wind speed time history of the random wind field of the wind turbine structure, and check the calculated power spectrum and the target spectrum, which verifies the applicability of the HSM-BTI method to the random wind speed time history simulation of the wind turbine structure.
Transient analysis of 1200kV DC generator charging process
Authors: Li Yu
Published: July 2021

UHV power transmission technology is already under development and its economics. It is necessary for my country to develop UHV. One of the three key technical issues of UHV power transmission technology is UHV insulation and requirements. In order to ensure the safe and stable operation of UHV DC equipment, UHV DC test equipment must go ahead, and the stable operation of the 1200kV UHV bipolar DC generator itself as the main power supply of the test line is very important. This article first carried out the modeling and design of the bipolar high voltage DC generator, and then used the electromagnetic transient analysis program ATP-EMTP to simulate the charging process of the generator and analyze the transient state. The transient characteristics of the generator were analyzed. Influencing factors.
Design of hard carbon anode with low specific surface area and low porosity in sodium ion battery
Authors: Gao Yifan
Published: July 2021

Among various anode materials, such as hard carbon, which as the most promising material, has shown great advantages in terms of reserves, initial coulombic efficiency and cycle stability. By studying the mechanism of storing sodium ions in hard carbon, it is found that the specific surface area and porosity of hard carbon are the key factors that affect hard carbon as a battery anode material. Hard carbon is obtained by setting different precursors and different pyrolysis temperatures. These carbons have different surface areas and porosities. The electrochemical performance was tested separately, and the results show that hard carbon materials with low specific surface area and low porosity usually showed higher initial coulombic efficiency (ICE), superior rate performance, larger reversible capacity and stronger cycle stability. This is because the hard carbon with low specific surface area reduces the contact area between the electrode and the electrolyte, thereby reducing the loss of sodium ions. In addition, the micropores on the surface shorten the diffusion distance of sodium ions. Also, the resulting low-defect structure has a high degree of graphitization and a good degree of order, which enhances electrical conductivity, increases reversible capacity, and makes the structure more stable. This article introduces several types of methods for constructing hard carbon anode with low specific surface area and low porosity, and by influencing the internal structure of the electrode, thereby enhancing ICE and other properties. This provides a new idea for constructing anodes with superior performance.
Design and performance evaluation of a submerged floating tidal current power generation device
Authors: Zhou Xu , Wang Dazheng , Guo Bin
Published: July 2021

Due to the difficulty and high cost of offshore power supply, there are still many remote islands which have not been fully developed and utilized. In order to solve this kind of problem, a new type of marine current turbine (MCT) power generation device was designed for Tuoji Island, Changdao County, Shandong Province, which is convenient for installation and maintenance. This paper presents both the prototype design and model test verification work. Limited by the size of circulating water channel, the test model was modeled and manufactured under the scale of 3:100, which means the turbine model is not able to meet the small scale geometry similarity and gravity equivalent at the same time. A light circular plate was designed to replace the resistance of the turbine as equal by means of CFD. Then it combines the main body and the equivalent disc to complete the mooring test, observing the attitude response of the device under different angles of current. On the basis, the hydrodynamic performance of the whole device model was observed under different inflow speeds and angles. The results of the model tests indicated that the prototype is relatively stable under the design condition.
Research on Tower-Type Solar Photothermal Power Generation Technology
Authors: Fang Yueyun , Zhu Yingying , Huang Renlong
Published: July 2021

China has abundant solar energy resources and a huge market prospect. Tower-type solar power generation technology has high solar energy conversion rate and great room for improvement in power generation efficiency, so it is widely used in power stations. This paper analyzed the characteristics and status quo of various tower-type photothermal generation technologies, found that the tower-type molten salt power generation technology is an excellent power generation technology, and analyzed the characteristics and potential risks of this technology. The research results can provide references for research on tower-type solar power generation technology.
Research on Energy Management of Microgrid in Power Supply System Using Deep Reinforcement Learning
Authors: Jin XianZhi , Lin Fei , Wang Ye
Published: July 2021

Aiming at the energy storage scheduling problem of microgrid system with wind power generation, this paper proposes an energy management strategy of microgrid based on deep reinforcement learning. In order to analyze the influence of different scenario combination models on the microgrid energy storage dispatching strategy, taking the residential user microgrid system as an example, a microgrid dispatching problem environment model was constructed. In the case of changes in multiple factors such as power generation and load, the coordinated control of compound energy is a complex optimization decision-making problem. Different schemes may affect the stability of the system’s power supply, utilization efficiency and economic benefits. To this end, this article uses three deep reinforcement learning algorithms and compares them with experiments. The results show that there are obvious differences in the ability of deep reinforcement learning algorithms to converge to the optimal strategy, but it also proves the feasibility and effectiveness of deep reinforcement learning in the coordinated control of composite energy storage problems, which has strong academic significance and engineering value, and can be used to deal with similar problems.
Application of improved EEMD algorithm in Low Carbon HVDC transmission line detection
Authors: Gao Ming , Xu Jian
Published: July 2021

In electronic detection and signal processing, the convenient and practical EEMD algorithm is generally selected. In this paper, the problems of the algorithm in some specific areas are improved. By adding white noise, the white noise is replaced by the white noise with opposite positive and negative amplitude, and the Schmidt orthogonalization theory is used to process each signal to eliminate the influence of modal function and improve the signal quality Anti mode aliasing ability, improve the level of multiple harmonic decomposition.
Electrical power systems energy saving and consumption reduction through transformer capacity and operation scheme
Authors: Mu Xingchen
Published: July 2021

on the basis of summarizing the power loss of transformer, based on the optimal load rate of transformer or the principle of minimum comprehensive energy efficiency cost[1], the transformer capacity can be reasonably selected, so as to effectively reduce the increase of operation cost caused by too large or too small transformer capacity selection, and improve the energy saving and economy; After the transformer is selected, the economic operation scheme of the transformer can be used to arrange the operation[2], including making the transformer work in the economic operation section, economic switching among various operation modes of the transformer, economic distribution among transformer loads, etc.
Design of the Monitoring System for Power Distribution Area by Clean Energy Intelligent Integration Terminals
Authors: Hou Zhe , Sun Xin , Ju Zeli , Li Zhe , Niu Quanbao , Liu Shulin
Published: July 2021

Power distribution area is an important part of low-voltage distribution network. Because of its wide distribution and complex environment, it often causes large area blackout or even worse. As the core equipment in the automation construction of low-voltage distribution network, the monitoring and management level of distribution network will be directly affected by the performance of intelligent transformer terminal. The traditional intelligent transformer terminal and concentrator belong to the two departments of operation and distribution, and there are some problems, such as non-sharing of data, duplication of functions, increasing the workload of operation and maintenance. In view of the above defects, this paper puts forward the concept of intelligent integration terminals, which has the functions of intelligent transformer terminal and concentrator. Based on this terminal, a set of power distribution area condition monitoring system is designed, which can realize the function of low-voltage distribution station area condition information monitoring, low-voltage line topology identification and branch line loss analysis. While the construction cost of power distribution area is reduced, the intelligent management level of the low-voltage distribution network can also be comprehensively improved.
Research On Energy Distribution of Multi-Scene Hydropower System Through Improved Power Load Optimization Strategy
Authors: Zhao Yulong
Published: July 2021

Taking the minimization of coal consumption in hydro-thermal power system as the objective function, this paper focuses on the static water abandonment strategy and improved dynamic water abandonment strategy, given the constraint conditions of hydropower station generation flow, reservoir water quantity, load balance constraint and power constraint. in this paper, the penalty cost of abandoned water is introduced into the existing model, and a short-term electric power balance model considering the cost of abandoned water is established. In view of the deficiency that it is difficult to effectively obtain feasible solutions that meet large-scale and complex constraints in the process of solving the model, the premature convergence and local optimization of the algorithm are avoided. An optimization algorithm is proposed to provide reference for solving the problem that the calculation efficiency of optimal dispatching of large-scale hydropower stations is the problem faced by hydropower and power system operation.
Analysis and Research on Forecasting Electricity Demand Based on ARMA and VAR Model
Authors: Yang Liping , Pang Jian
Published: July 2021

This paper uses the relevant data from the official website of the National Bureau of Statistics of China from 1980 to 2017, and uses the ARMA model and VAR-based co-integration analysis to predict the electricity demand from 2018 to 2020, making the forecast data more convincing. Besides, this paper uses unit root test, Granger causality analysis, Johansen test and other co-integration analysis methods to empirically study the determinants of China’s electricity demand, and establish a longterm equilibrium and its fluctuation relationship between electricity demand and GDP, urbanization rate, industrialization rate, and electricity use efficiency. The forecast results were compared and analyzed, and corresponding policy recommendations were put forward to provide data support and reference for the future development of China’s power industry.
Gas-phase elemental mercury removal by bamboo charcoal impregnated with KMnO4: mechanism study
Authors: Tan Zengqiang , Niu Guoping , Li Yuanhao , An Xiaoxue
Published: July 2021

Bamboo charcoal is made from biomass with porous structure. The performance of bamboo charcoal (BC) and KMnO4-modified BC was studied with a bench-scale fixed-bed reactor. X-ray photoelectron spectroscopy, X-ray diffraction, elemental analysis and BET surface area analysis were used to determine the physical and chemical property of the sorbents. The results show that the modification increased the oxygen functionalities and π electrons, which facilitate the mercury oxidation on sorbent surface and act as possible active centers for elemental mercury.
Simulation and optimization control plan model for fungus monitoring
Authors: Lan Chenrui , Zhu Tianyu , Liu Ning , Wang Jiaqi , Zhang Yujie
Published: July 2021

In order to effectively monitor and analyze the growth of fungi,this paper established a mathematical model to deal with it. First of all, we selected a Monte Carlo simulation model to simulate according to temperature and humidity to get its possible distribution. Secondly, on the basis of the previous model, we simulated the decomposition agents with different growth rates and different moisture resistance respectively, and finally got their relevant distribution. Third, we selected a grey prediction model to simulate the situation of different fungi separately, and got their specific distribution predictions. At the same time, it is described by the corresponding growth characteristics of different types of fungi, and their sensitivity is used to explain the impact of different weather. Finally, we established a principal component analysis model to analyze the data of different fungal communities, and estimate the growth of the fungi through temperature, humidity, etc., so as to clarify the biodiversity level of different fungal communities and give their impact.
Research on Over-temperature Online Rapid Early Warning Methods of Oil-immersed Transformer under the Condition of Three-Phase Unbalance
Authors: Chen Tao , Xiao Yingtao , Zheng Shuwei , Zhang Jinfeng
Published: July 2021

The number of oil-immersed transformers in the distribution network is huge, and the real-time electrical quantity information of a single device is little in number and longer in period in comparison with the main network device. Owing to the randomness of the load, the transformer has long been dynamic three-phase unbalance. The short-term emergency load formed by the rapid rise of residents’ load in summer and winter causes the hotspot temperature of the single-phase winding to rise, the insulation quickly ages, the operating life suffer serious losses, and even cause the transformers in the area to be burned out in large areas. On the basis of the existing data resources, the feasible judgment methods is made from the overall interests, which can avoid damage of the equipment and inform the operating personnel of the residual margin simultaneously. This paper fully proposes the over-temperature online early warning method of oil-immersed transformers under three-phase unbalance, analyzes the compatibility of various commonly used three-phase unbalance algorithms and the hotspot temperature of winding, establishes the logic model of transformer over-line and abnormal warning, and assesses the life loss during the extreme operation of the equipment for reliability. The results of the calculation examples show that the research on the over-temperature online early warning method of oil-immersed transformer under the condition of three-phase unbalance has the capacity to prevent extensive burning of equipment and predict the extreme residue of the transformer.
Particle flow velocity detection technology based on electrostatic induction method and urban block distance method
Authors: Chen Jiange
Published: July 2021

Aiming at the problem of difficulty in detecting the velocity of coal dust particles in pneumatic conveying coal dust pipelines, this study is based on electrostatic induction method and urban block distance algorithm to achieve accurate detection of coal dust velocity in dust conveying pipelines. Firstly, the principle of electrostatic induction is introduced in this paper. The dust particles with static electricity can sense fluctuation signals on the surface of the metal detector electrode. Then two electrostatic sensors are designed and installed on the upstream and downstream of the dust conveying pipeline. The actual flow velocity of coal dust is obtained by using the urban block distance method to analyze the electrostatic induction signals generated with the two sensors. Compared with the current cross-correlation algorithm, the urban block distance method has the advantage of better real-time performance and less computation. Finally, the experimental results show that the detection error of the coal dust velocity detection technology based on the electrostatic method and the urban block distance method is small, and the maximum absolute error does not exceed 0.16m/s compared with the velocity of the airflow. The results are reliable and effective.
Application of SNCR denitration technology in circulating fluidized bed boiler
Authors: Zhao Quanzhong , Zhang Zhiyong , Runa A , Wu Jie
Published: July 2021

In order to ensure the realization of NOX emission limit and implement the enterprise’s leading. the denigration principle, basic structure and application effect of SNCR (selective non-catalytic reduction) denigration system of circulating fluidized bed boiler in a power plant are introduced. The test results show that SNCR denigration technology can meet the NOx emission requirements of the new pollutant emission standard of thermal power plant.
Reuse of power plant pollution sources in the cultivation of thermophilic cyanobacteria PKUAC-SCT E542
Authors: Chen Pengyu , Tang Jie , Daroch Maurycy
Published: July 2021

The growth of hermophilic cyanobacteria Thermosynechococcus elongatus PKUAC-SCT E542 was not inhibited when the leachate from the flue fly ash of waste incineration plant was added to the culture of cyanobacteria, and the growth of cyanobacteria was not inhibited. Some elements in the BG-11 medium could be used with smoke Dow fly ash leachate was replaced, and the growth rate was increased by 6% to 12% compared with the use of BG-11 medium. In addition, combining the use of fly ash leachate and simulated flue gas to replace Na2CO3 in the microalgae culture system as the sole carbon source, the growth of cyanobacteria was still active, and there was no significant difference compared to BG-11. After 4 days of cultivation, the biomass yield was 0.805 ± 0.05 g/L and 0.751 ± 0.02 g/L, achieving a higher biomass accumulation efficiency, and realizing the feasibility of replacing medium components with leachate and flue gas at the same time. In this system, the cultivation of thermophilic cyanobacteria and the two major pollutants of power plants were mutually beneficial, and at the same time achieve the results of resource utilization of pollution sources, reduction of cultivation costs and production of phycobiliprotein(PBPs).
Research on capacity planning of thermal power units in deep peak regulation auxiliary service
Authors: Liang Jiahao , Liu Dunnan
Published: July 2021

Deep peak regulation service is an important transaction type in China’s power auxiliary service. The thermal power units’ participation in the quotation decision of deep peak regulation auxiliary service is related to their own benefits and the smooth operation of the whole deep peak regulation auxiliary service system. In order to study the influence of capacity planning of thermal power units on the transaction income and market equilibrium of market players in deep peak regulation, this paper builds static models of thermal power units participating in deep regulation transactions with complete information and incomplete information based on game theory and virtual game opponent analysis method, and gives the solution method of game equilibrium. In addition, based on the depth of the province peak shaving auxiliary services related data to do the game model of case analysis, obtained in the condition of incomplete information static equilibrium in depth peakload auxiliary services unit the best boot output range and corresponding interval unit best deep callback service decisions, in this paper, the rationality of the model and its equilibrium solution is verified, It is hoped that the research of this paper has some reference value for the capacity planning decision of thermal power units participating in depth peak regulation.
Research on Key Technologies of New Energy Fuel Cell Electric Vehicle
Authors: Bai Yunlong , Zhu Qiang , Zhang Jingming , Guo Jinwei , Dong Haibo
Published: July 2021

Energy and environmental problems have become the biggest obstacles to the development of traditional automobiles. Fuel cell vehicles based on hydrogen energy have injected vitality into the progress of automobile industry. With the gradual strengthening of China’s concept of energy conservation and environmental protection, new energy vehicles have been loved by more and more people because of their low fuel consumption and low pollutant emissions, which has also promoted the rapid development of new energy vehicles in China. Fuel cell is a device that makes hydrogen react with oxygen in air to generate electric energy. As an efficient and clean electric vehicle, compared with traditional internal combustion engine vehicles, fuel cell vehicles use electric motors instead of internal combustion engines as the power source of fuel cell vehicles. This paper introduces the basic structure of fuel cell vehicle, and discusses the key technologies in the development of fuel cell vehicle, such as fuel cell, motor control, body and chassis design, electronic control, testing and system optimization.
Nonlinear static analysis of thermal power plant buildings
Authors: Huang Youqiang , Chen Shixi
Published: July 2021

When steel structure is adopted in the main building of domestic thermal power plant, steel frame-center support structure is often adopted. The main building of a 2×660MW thermal power plant in Turkey is located in a high-intensity area, the earthquake area is Zone 1, and the building site category is Z2. In order to make the structure have better ductility and energy dissipation capacity under rare earthquakes, the structure adopts the form of steel frame-eccentric support structure. Through the nonlinear static analysis of the structure, the performance of the structure under the action of rare earthquakes is studied, which provides reference experience for future engineering design. The analysis results show that the energy dissipating beam has played a good role in dissipating energy under the action of rare earthquakes, effectively protecting the main structure, and the structure has not entered a collapsed state.
Research on a Reinforcing Method for Insulated Cable
Authors: Qian Yong , Ren Shuang , Lin Chang , Wang Xiaobing , Shen Amei
Published: July 2021

Insulated cables are widely used in the power grid, especially the urban power grid is dominated by overhead insulated cables, with main models of JKLGV (PVC insulated overhead cable) or JKLGVJ (cross-linked polyethylene insulated overhead cable) insulated wire. The method introduced in this paper is a fast and simple reinforcement method to deal with the damage of overhead insulated wire caused by external force, when the damage degree of metal wire is less than 10%. It is also called “cable damage repair 2/7 law”, i.e. implement seven processes in a certain sequence using two specific materials.
Analysis on the Reason of Excessive Moisture Content in Wet FGD System in a Power Plant
Authors: Zhao Quanzhong , Zhang Zhiyong , Runa A
Published: July 2021

In a thermal power plant flue gas wet desulphurization system appeared the problem of high-moisture content of gypsum. The paper combines the desulfurization system operating statement and laboratory analysing results. Meanwhile, it analyses the factors composed high-moisture content. The conclusion shows that there are several main factors influence the gypsum dehydration effect, namely content of dust concentration about the system entrance disposal situation of desulphurization wastewater and the quantity of air oxidation. The paper also shows that the gypsum cyclone running condition directly influences the effect of gypsum slurry dehydration. The paper suggests that,in order to ensure the safe operation of desulphurization system, the correspondent treatment measures and suggestions were put forward.
Applicability Analysis of Pre-cracked Material for SHPB during the High-level Radioactive Waste Geo-disposal
Authors: Gao Huan , Liu Chang , Man Ke
Published: July 2021

According to the national nuclear power plan, the high-level radioactive waste should be disposed safety and effectively. And the deep geological disposal is the main way, which is influenced by the surrounding rock and soil, especially the physical and mechanical properties. Currently, the SHPB is mature equipment for the material’s dynamic testing. It is mainly used to load the entire specimen, however, the specimen with the pre-crack is less used. Firstly, it should satisfy two hypotheses, i.e. the one dimension stress wave and the stress equalization when using the SHPB to measure the mechanics characteristics of the material, especially for the pre-cracked specimen. Then, from the point of stress equalization along the specimen, emphasize the importance of the dynamic force equilibrium during the testing data processing. Finally, the SHPB testing system could also be applied to the pre-cracked specimen has been proposed.
Heat Dissipation Structure and Test System Design of a New Piezoelectric Fan
Authors: Lin Qing , Wang Kun , Li Lidan , Wang Yanyong , Ma Zhiyang , Zhang Xiaozheng
Published: July 2021

The heat dissipation structure of a new piezoelectric fan is put forward in this paper; the system adopts the piezoelectric fan embedded design, which realizes efficient and stable heat dissipation for the target without increasing the volume of the device. The system adopts the improved piezoelectric fan structure, on the basis of orientation, low power consumption, low cost, and highly efficient heat dissipation, realizes key technologies such as low noise, temperature control, and leakage prevention. This paper introduced composition and characteristics of the new heat dissipation structure in detail and conducted thermal stress simulation, built test platform, carried out temperature test for the physical object, and realized the integrated iterative closed-loop design of thermal design, thermal simulation, and thermal test.
Pollution Prevention and Soil Activation of Garden Plants in Urban Environmental Ecosystem
Authors: Zhao Meina
Published: July 2021

Cities are currently facing more and more serious environmental pollution problems. Garden plants are alleviating due to their ecological functions such as carbon and oxygen balance, transpiration and heat absorption, pollution and dust retention, bacteria reduction and noise reduction, water conservation, soil activation and nutrient cycling, maintenance of biodiversity, landscape functions, disaster prevention and mitigation, pollution and vice versa. Urban environmental pressure plays a vital role. Aiming at the diversity of urban garden plants, starting from its ecological function on the environment, the thesis focuses on the application of colourful leaf plants, ground cover plants, climbing plants, aquatic plants, bamboo plants and other garden plants in urban greening and pollution prevention. This article provides theoretical basis and practical guidance for the selection and application of urban garden tree species.
Effect of Myriophyllum verticillatum on controlling phosphorus release from sediment for water environment purification
Authors: Wang Shujing , Lin Tian , Liu Xiao , Chen Xiang
Published: July 2021

Eutrophication is one of the most common water pollution problems in the world. In this paper, the effects of Myriophyllum verticillatum on phosphorus content in water and sediment were studied. The results showed that Myriophyllum verticillatum had the strongest purification effect on water sample. Under the condition of sufficient light, suitable temperature and environmental factors not affected by the external environment, the phosphorus content in the overlying water increased first and then decreased. In addition to the external factors, the phosphorus content in the water decreased. The results show that the growth of Myriophyllum verticillatum depends on the change of phosphorus concentration in water. The increase of phosphorus concentration in water will increase the phosphorus concentration in plants and accelerate the growth of Myriophyllum verticillatum. However, the growth of Myriophyllum verticillatum will consume more phosphorus. Myriophyllum verticillatum in sufficient light, suitable temperature, environmental factors are not affected by the outside world. The contents of phosphorus in the sediments showed a downward trend. In addition to the external factors, the phosphorus content in the sediment was reduced by Myriophyllum verticillatum. The relationship between the growth of Myriophyllum verticillatum and the total phosphorus concentration in sediments is interdependent. The release of phosphorus in sediment will increase the phosphorus content in water, which will lead to the enrichment of phosphorus in plants and accelerate the growth of Myriophyllum verticillatum. The growth of Myriophyllum verticillatum will make Myriophyllum verticillatum need more phosphorus, which will accelerate the absorption of phosphorus in water and release more phosphorus from sediment. This is the reaction mechanism of phosphorus removal by Myriophyllum verticillatum; Under the conditions of sufficient light, warm climate and environmental factors not affected by the external environment, the total phosphorus content of Myriophyllum verticillatum was on the rise.
Treatment Technology of Printing and Dyeing Wastewater from Modified Grapefruit Peel
Authors: Zhang Yongxun
Published: July 2021

In this study, methylene blue wastewater was used as simulation printing and dyeing wastewater, and ferric chloride was used as modifier to modify the pomelo peel of Shatian Pomelo from Meizhou, Guangdong. The optimal ratio of modifier and raw material was analyzed by simulating the change of absorbance of printing and dyeing wastewater, and the prepared pomelo peel was characterized by SEM. The experimental results showed that when the ratio of modifier to grapefruit peel raw material was 25:1, the modified grapefruit peel biochar reached the highest adsorption effect of 10 mg/L methylene blue solution, and the adsorption efficiency was as high as 97.16%.
Effect of pH and Initial Concentration on Adsorption of Chitosan in Restaurant Sewage Treatment Technology
Authors: Wang Yibo , Liu Hua , Mai Zhijian , Jiang Peiqi , Yang Canjie , Yao Zhien , Zhang Hongyu , Qiu Anqi
Published: July 2021

In this study, the waste shrimp head shell in catering industry was used as raw material to extract chitosan, and the wastewater added with Fe (III) was used as simulated wastewater. The static adsorption experiment was used to analyze the change of absorbance of simulated wastewater after adsorption of Fe (III) by chitosan to explore the optimal adsorption conditions of Fe (III) by chitosan. The results showed that the adsorption rate of chitosan decreased with the increase of Fe (III) concentration in the initial solution, and the initial concentration of Fe (III) was 10-30 μ When the initial concentration increased to 30-60 g/ml, the adsorption rate of chitosan remained almost unchanged μ The adsorption rate decreased gradually at the concentration of 0.5 g/ml; The results showed that the adsorption rate of chitosan for iron ion increased rapidly to 82.32% from pH 1.0 to 2.0, and the lowest adsorption rate was 53.32% at pH 1.0.
Limit model for the Vlasov–Maxwell system with strong magnetic fields via gyroaveraging
Authors: Keßler T. , Rjasanow S.
Published: July 2021

This paper deals with the Vlasov–Maxwell system in the case of a strong magnetic field. After a physically motivated nondimensionalization of the original system, a Hilbert expansion is employed around a small parameter given as the product of the characteristic time scale and the gyrofrequency. From this, necessary conditions on the solvability of the reduced system are derived. An important aspect is the reduction of the six-dimensional phase space to five dimensions. In addition to the discussion of the partial differential equations, also initial and boundary conditions both for the full system and the limit model are studied.
Genome-wide association study of febrile seizures implicates fever response and neuronal excitability genes
Authors: Skotte Line , Fadista João , Bybjerg-Grauholm Jonas , Appadurai Vivek , Hildebrand Michael S , Hansen Thomas F , Banasik Karina , Grove Jakob , Albiñana Clara , Geller Frank , Bjurström Carmen F , Vilhjálmsson Bjarni J , Coleman Matthew , Damiano John A , Burgess Rosemary , Scheffer Ingrid E , Pedersen Ole Birger Vesterager , Erikstrup Christian , Westergaard David , Nielsen Kaspar René , Sørensen Erik , Bruun Mie Topholm , Liu Xueping , Hjalgrim Henrik , Pers Tune H , Mortensen Preben Bo , Mors Ole , Nordentoft Merete , Dreier Julie W , Børglum Anders D , Christensen Jakob , Hougaard David M , Buil Alfonso , Hviid Anders , Melbye Mads , Ullum Henrik , Berkovic Samuel F , Werge Thomas , Feenstra Bjarke
Published: July 2021

Febrile seizures represent the most common type of pathological brain activity in young children and are influenced by genetic, environmental and developmental factors. In a minority of cases, febrile seizures precede later development of epilepsy.

We conducted a genome-wide association study of febrile seizures in 7635 cases and 83 966 controls identifying and replicating seven new loci, all with P < 5 × 10−10.

Variants at two loci were functionally related to altered expression of the fever response genes PTGER3 and IL10, and four other loci harboured genes (BSN, ERC2, GABRG2, HERC1) influencing neuronal excitability by regulating neurotransmitter release and binding, vesicular transport or membrane trafficking at the synapse. Four previously reported loci (SCN1A, SCN2A, ANO3 and 12q21.33) were all confirmed. Collectively, the seven novel and four previously reported loci explained 2.8% of the variance in liability to febrile seizures, and the single nucleotide polymorphism heritability based on all common autosomal single nucleotide polymorphisms was 10.8%. GABRG2, SCN1A and SCN2A are well-established epilepsy genes and, overall, we found positive genetic correlations with epilepsies (rg = 0.39, P = 1.68 × 10−4). Further, we found that higher polygenic risk scores for febrile seizures were associated with epilepsy and with history of hospital admission for febrile seizures. Finally, we found that polygenic risk of febrile seizures was lower in febrile seizure patients with neuropsychiatric disease compared to febrile seizure patients in a general population sample.

In conclusion, this largest genetic investigation of febrile seizures to date implicates central fever response genes as well as genes affecting neuronal excitability, including several known epilepsy genes. Further functional and genetic studies based on these findings will provide important insights into the complex pathophysiological processes of seizures with and without fever.
Reducing Influenza Virus Transmission: The Potential Value of Antiviral Treatment
Authors: Hayden Frederick G , Asher Jason , Cowling Benjamin J , Hurt Aeron C , Ikematsu Hideyuki , Kuhlbusch Klaus , Lemenuel-Diot Annabelle , Du Zhanwei , Meyers Lauren Ancel , Piedra Pedro A , Takazono Takahiro , Yen Hui-Ling , Monto Arnold S
Published: July 2021

Prompt antiviral treatment has the potential to reduce influenza virus transmission to close contacts, but rigorous data on the magnitude of treatment effects on transmission are limited. Animal model data indicate that rapid reductions in viral replication after antiviral treatment reduce the risk of transmission. Observational and clinical trial data with oseltamivir and other neuraminidase inhibitors indicate that prompt treatment of household index patients seems to reduce the risk of illness in contacts, although the magnitude of the reported effects has varied widely across studies. In addition, the potential risk of transmitting drug-resistant variants exists with all approved classes of influenza antivirals. A controlled trial examining baloxavir treatment efficacy to reduce transmission, including the risk of transmitting virus with reduced baloxavir susceptibility, is currently in progress. If reduced transmission risk is confirmed, modeling studies indicate that early treatment could have major epidemiologic benefits in seasonal and pandemic influenza.