bluuebunny/crossref_metadata_2025 huggingface dataset:
Uniaxial Compression Properties of Marble with Crossed Double Fissures at Different Angles in Mineral Resource Exploration
Authors: Tang Lizhong , Tu Yihao
Published: July 2021

In order to study the effect of the two prefabricated crack angles of the prefabricated cross-shaped cracks on the peak stress, crack development and acoustic emission characteristics of the marble specimens under uniaxial compression, the uniaxial compression test and acoustic emission were carried out by using natural marble specimens to prefabricate the intersecting cracks at different angles. test. Experimental research shows that: (1) The strength of the prefabricated cracked specimen is significantly lower than that of the complete specimen, and the strength of the specimen decreases as the sum of the angles between the two cracks and the loading direction increases. When the sum of the angles is the same, the strength of the two cracks the greater the angle of the crack with the load direction, the lower the strength. (2) The test piece always cracks first at the end of the crack with a larger angle with the loading direction, and the through crack that leads to the final failure of the test piece is also gradually developed from the two ends of the crack. (3) The larger the angle between the two prefabricated cracks of the specimen and the load direction, the higher the accumulated acoustic emission energy, the higher the accumulated acoustic emission energy, and the lower the strength of the specimen.
The Design and Construction of Prefabricated Reinforced Truss Concrete Composite Plate in Soil Excavation Foundation
Authors: Xue Tianlang , Gu Chenglong
Published: July 2021

As one of the most commonly used forms of prefabricated floor slabs, steel-bars truss concrete composite slabs have been widely accepted in China in recent years. However, due to its application is still based on the use conditions of cast-in-place slabs, and most engineers and technicians are unfamiliar with the features and use methods of composite slabs, the application of it has numerous limits. This paper primarily focuses on the characteristics of steel truss concrete composite plate and the process of its design, fabrication and construction.
Analysis of Stress and Deformation and Stability of Grouting Wall and Mud Control in Tunnel Excavation
Authors: Wang Xuebin
Published: July 2021

To prevent the grout and fissure water from gushing out of the working face and to ensure the effective diffusion of grout along the fissure under the action of high grouting pressure, the grouting wall should be set up on the working face before grouting to ensure the grouting effect. This study found that under the grouting pressure of 4MPa, the grouting wall model with a thickness of 80cm is more stable than that with a thickness of 50cm. At the same time, for the grouting stop wall with a thickness of 80cm and a dip angle of 50°, both the horizontal deformation and the settlement of the vault have met the requirements of the construction specification in the process of simulated grouting calculation.
Construction technology of super high rise ultra-thin shear wall bearing heavy tonnage tower crane under energy saving and emission reduction
Authors: Zhao Ziwu , Li Shimin , Yu Ziqiang , Chen Jun , Li Yan , Zhang Qinxiong , Meng Zhaohu , Gao Peng , Chen Zhanxun , Wang Ning
Published: July 2021

Lanzhou·Famous City Plaza Project There are two internal climbing boom tower cranes in the core tube of 1# building. From the 50th floor, the thickness of shear wall is reduced to 200mm, and the design wall thickness and reinforcement can not meet the stress requirements of boom tower cranes. Through the finite element analysis software ANSYS simulation analysis, the core tube shear wall and coupling beam are strengthened, the reinforcement is increased, and the concrete strength grade is improved. At the same time, the steel beam of the boom tower crane is reinforced to reduce the load borne by the shear wall, and then the seamless steel pipe and jack are used to push back the load of the steel beam from the bottom, which solves the problem of insufficient bearing capacity of the ultra-thin shear wall to the boom tower crane, makes the boom tower crane work normally, and ensures the construction safety and the construction period.
Properties characterization of interfacial transition zone of recycled concrete for reducing the resource waste and environmental pollution
Authors: Zhang Yichao , Chen Xingyi , Liu Aixia , Zhou Jinghai
Published: July 2021

The extensive use of concrete results in a lot of resource waste and environmental pollution. More experts and scholars began to pay attention to the application of recycled concrete in construction engineering. The weak interface transition zone of recycled concrete is the fundamental reason for the deterioration of recycled concrete materials, components and structures. This paper summarizes the property and its characterization of interface transition zone of recycled concrete, which can improve the mechanical parameters such as elastic modulus and thickness of interface transition zone (ITZ) of recycled concrete. Through the nano-indentation technology and scanning electron microscope (SEM) technology can study the cracks in the interface transition zone of recycled concrete from micro to meso. The combination of the two technologies can make it easier to study the microstructure and mechanical properties interface transition zone of recycled concrete. It is concluded that elastic modulus of ITZ of recycled concrete is improved through adding fiber, slag, silica fume and other materials, and the thickness of that is decreased at the same time, which can strengthen the property of ITZ, which provides a better method for the study of the failure mechanism of recycled concrete.
Identification of preferential groundwater run-off belts through correlation between spring discharge and precipitation in Baiquan spring basin
Authors: Yu Yafei , Shu Longcang , Dong Yanan , Wang Xin
Published: July 2021

Baiquan spring group is a typical sign of the existence of preferential groundwater run-off belts in Baiquan spring basin. The spring flow is mainly affected by the supply of karst water, and atmospheric precipitation is the most important factor affecting the supply of karst water. By using Pearson correlation coefficient method, the number of months with the maximum Pearson coefficient between the spring discharge and the precipitation at the monthly scale of each hydrological station in the water spring area is analyzed, which is called the best precipitation delay. According to the optimal precipitation lag time, the Pearson correlation coefficients of spring discharge and precipitation of each hydrological station in 2006-2013 are calculated on the three months scale and the daily scale respectively, and the hydrological stations closely related to spring discharge are found out. The results show that: the best precipitation lag time of each station is 6 months; the precipitation change of Wangsheren station, Suncun station and Wenzu station is consistent with the spring flow process, which has a relatively large impact on the spring flow. The 3 stations may be located in the preferential groundwater run-off belts bearing medium in Baiquan spring basin.
Safety Science and Engineering Technology of Dust Control and Air Quality Improvement in Large Coal Mines
Authors: Liu Haixia , Lian Qingwang
Published: July 2021

The paper introduces a new type of large-scale coal mine dust monitoring and efficient treatment technology, which realizes online continuous monitoring and control of mine dust concentration, and can transmit the dust concentration at the detection point to the underground control system in real time, realizing intelligent coal mine dust management, When the dust concentration exceeds the set standard, the coal shearer and road header can automatically carry out high-pressure spraying to reduce dust. Compared with the traditional technology, the dust removal efficiency is increased by more than 80%.
Effects of Different Land Use Patterns on Soil Organic Matter and Soil Cycle Process
Authors: Li Xia , Jin Xin , Song Ying
Published: July 2021

Soil organic matter is not only the condition for the survival and development of soil organisms, but also the product of the survival and development of soil organisms. Land use pattern is an important factor affecting the content and dynamic change of soil organic matter. There are significant differences in the spatial and temporal distribution and circulation of matter under different land use patterns, which interfere and adjust the cycle process of soil biochemistry, and the content of soil organic matter also changes. In this paper, the soils under four land use types, i.e., grassland, woodland, cultivated land and unused land, in the surrounding area of Yanshan Campus of Guilin University of Technology were selected as the research objects, and five samples of 10-20cm topsoil under different land use types were collected by diagonal method. The soil organic matter content was measured by hydration heat K2Cr2O7oxidation-colorimetry, and the differences and laws of soil organic matter content under different land use types were discussed. The results showed that soil organic matter content was closely related to land use patterns, and there were differences in organic matter content among different land use patterns, which was supported by F test of land use patterns. According to the average value of sample organic matter, the organic matter content of red soil under different land use patterns is cultivated land (3.89%) > unused land (3.02%) > grassland (1.25%) > forest land (1.12%). However, under the condition of α=0.01, there is no significant difference between woodland and grassland, while there is significant difference between woodland and cultivated land and unused land, while there is no significant difference between grassland and cultivated land and unused land.
Research on the Harmless and Recycling Treatment Technology of Drilling Waste Mud Based on Changqing Oilfield
Authors: Zhou Bo , Lei Biao , Hou Lin , Huang Lei , Lian Xiaolong , Zhou Bo
Published: July 2021

During the process of oil and gas field exploration and development, a large amount of solid-liquid wastes will be produced, among which drilling waste mud is the main pollutant. If the drilling waste mud is discharged untreated or improperly treated, it will inevitably threaten the local environment and ecological safety, and environmental pollution will not be conducive to the sustainable development of the petroleum industry. At present, how to realize the reduction, harmless treatment and comprehensive utilization of drilling waste mud produced during oil and gas field exploration is a bottleneck restricting the high-quality development of oil and gas fields. This study mainly introduces the source, composition and environmental effects of oilfield drilling waste mud, summarizes the research status of oilfield drilling waste mud at home and abroad, analyzes the difficulties and prospects of related treatment technologies, and introduces the characteristics of drilling waste mud in Changqing Oilfield and the application status of reducing and harmless treatment technology.
Simulation Analysis of Magnetic Flux Leakage Detection Damage of Natural Gas Pipelines
Authors: Hu Bing , Zhang Ning , Wang Lu , Lin Penglong , Xu Lei
Published: July 2021

Pipeline damage can cause pipeline magnetic flux leakage. By analyzing the phenomenon of magnetic flux leakage, the integrity of the natural gas pipeline can be determined. In order to realize the detection of pipeline performance, this paper analyzes the principle of magnetic flux leakage detection technology, uses COMSOL simulation software to establish a metal pipeline simulation model, and compares the magnetic field distribution curves before and after the pipeline damage through ANSYS software. The simulation results show that the integrity of the pipeline can be effectively detected through the magnetic flux leakage detection and analysis.
Distribution characteristics of surface soil organic carbon in different land types in the loess hilly region
Authors: Meng Tingting , Liu Jinbao
Published: July 2021

Management of land and soil resources is important in the loess hilly region to explore the change characteristics of soil organic carbon in different land types. Four major land use types, including jujube orchard, 7-yr-old grassland, Cropland, and 30-yr-old grassland, were selected to study the distribution characteristics of soil organic carbon content from 0-100 cm in the small watershed of Yuanzegou watershed in the loess hilly region. The results showed that the soil organic carbon content of different land use types decreased with soil layer increasing. The contents of soil organic carbon at different depths were as follows: 7-yr-old grassland < Cropland < jujube orchard < 30-yr-old grassland, and there were significant differences among different land use types in 0-20 cm soil layer (P<0.05).
Optimization Model Design of Regenerative Braking Energy Utilization of Subway Train based on Block Zoning
Authors: Zhao Yang
Published: July 2021

There are a series of problems such as short distance between urban rail transit stations, large energy consumption, and heat treatment difficulty when trains start and stop. By optimizing the interval time and improving the efficiency of the regenerative braking energy of subway trains, these problems can be solved. In this paper, the primary entry point of the analysis is the condition of “traction -- idling -- braking” in the inter-station block partition. The energy utilization rate of the regenerative brake is calculated by using the overlapping time of the front and rear vehicle traction brakes. The utilization rate of the regenerative braking energy is expressed by the area method. On this basis, a model of 12 operating conditions is established, and the total traction power of train operation minus regenerative braking energy is taken as the objective function, and the train travel time, stop time, departure interval time, and other constraints are taken as constraints, and an optimization model of regenerative braking energy utilization of subway train based on block partition is designed.
Research on the Preparation of Supercapacitor Perovskite and the Performance of Solar Cell Integrated Devices
Authors: Jiang Pei , Lu Yuhan , Ma Ying
Published: July 2021

In today’s world rely on fossil fuels is the main energy, causing a series of ecological environment problems, people have to put attention to the renewable energy, including solar energy with its access to such advantages as low cost, relatively stable, clean particularly favoured by people, and perovskite high conversion efficiency of solar cells and solar cells that category. As a new type of energy storage element, supercapacitor has the advantages of high specific energy, good cycle stability and environmental friendliness compared with traditional capacitors, while polyvinyl alcohol is easy to process, easy to form film and low price. In this paper, a perovskite solar cell-supercapacitor integrated device preparation method is proposed, and its performance is studied and analysed.
Optimal allocation of power resources considering consumption of clean energy
Authors: Liu Dunnan , Li Hua , Zhang Tingting , Wang Lingxiang
Published: July 2021

Under the background of “carbon neutrality” and “carbon peak” targets, how to break the inter-provincial barriers and promote a wider range of clean energy consumption has become an urgent problem. This paper improves the traditional inter-provincial clearing model by introducing the correction coefficient of inter-provincial differences and the correction coefficient of carbon emission reduction. The results show that the improved clearing model can promote the wider consumption of clean energy in provinces. And it has better energy saving and emission reduction effect.
Optimal allocation of wind-solar storage capacity of microgrid considering carbon emission reduction benefits
Authors: Wang Xiumei , Zhu Qianying , Wang Yuqing
Published: July 2021

In the context of vigorously advocating the transformation of electric energy production to green and low emission, it is very important to rationally allocate the wind-solar storage capacity of micro-grid. Based on this, this paper aims at the micro grid with wind-solar storage. Firstly, the output model of wind-solar storage unit is established, combined with the system scheduling strategy. Then, the optimization objective was to minimize the total cost of investment and operation, and the benefits of carbon emission reduction were taken into account. Genetic particle swarm optimization algorithm is used to solve the optimal capacity allocation. Finally, according to the calculation results of the example, the proposed wind-solar storage capacity configuration considering the benefits of carbon emission reduction can effectively reduce the cost and carbon emissions of the microgrid.
Study on electrical properties of nonlinear materials for high voltage transmission
Authors: Shen Yubo , Zhang Jian , Sun Wei , Zhang Dewen , Zhou Hongyi , Chen Shiyu , Zhang Kexin
Published: July 2021

The new power grid puts forward higher and higher requirements for the insulation performance of power equipment. ZnO/LDPE composite has potential application value in high voltage transmission in China. With the wide application of ZnO/LDPE Composites, the study of the conductivity characteristics of the composites is helpful to further understand the conductive principle and application scope, and provide theoretical basis for reasonable use and modification.In this paper, the inorganic/polymer composites with nano ZnO as inorganic filler and low density polyethylene (LDPE) as matrix were prepared by double roll mill, and the effect of test temperature on the conductivity of the nonlinear composites was studied.
Research on wave and tidal current law prediction and coupling mechanism applied to ocean energy utilization
Authors: Li Yamei , Zhu Yutian , Zhao Shiwen , Li Zeyu , Wang Shiming
Published: July 2021

The energy efficiency of integrated wave and current turbine is closely related to the velocity and direction of wave force and tidal current force.To study the blade motion of the wave-tidal current integrated variable-pitch turbine, raise the capacity efficiency of the turbine, take Fishing grounds of Changjiang estuary Port as an example,based on the tidal current and wave features data in recent two years,time series prediction model was established to predict the changes of wave and tidal current in the next 24 hours respectively, and the prediction accuracy is up to 93%. The wave theory applicable to Fishing grounds of Changjiang estuary Port was confirmed as the second-order strokes wave theory, the wave-tidal current coupling equivalent velocity vector was deduced, which is related to the tidal current velocity, flow direction, average wave direction, average wave period and significant wave height. The predicted wave-current coupling velocity vector is obtained after the predicted 24 hours wave-current data was substituted into it, which can provide a method and basis for the design of marine energy turbine’s variable angle law in the future, and can be applied to the development of new energy and the prediction of Marine environment.
Research on the Influence of Photovoltaic Module Power Generation Efficiency and Manufacturing Technology on Power Grid Connection
Authors: Fang Qingyuan
Published: July 2021

The power generation efficiency of a photovoltaic power generation system is closely related to factors such as the material of the photovoltaic module, the tilt angle of the module installation, and the power of the module. At present, the output power of large-scale grid-connected photovoltaic power generation systems has large fluctuations and strong randomness. In order to accurately predict the output power of photovoltaic power stations to solve the problems of peaking and dispatching caused by large-scale photovoltaic grid-connected power generation to the grid. The article introduces the design of single-phase photovoltaic grid-connected inverter system and its control system based on big data technology. The research found that the photovoltaic manufacturing and grid-connected algorithms proposed in this paper can achieve the best power generation benefits of photovoltaic power plants, while improving the operation and maintenance efficiency of photovoltaic power plants.
The research on Inertial Control Strategy of DC Distribution Network
Authors: Sheng Siqing , Zhan Zhigang , Fu Yuan
Published: July 2021

The DC power grid has characteristics that the AC power grid does not have, and is becoming increasingly important in an environment where renewable energy sources are being connected to the power system in large numbers. It is of great importance to enhance the virtual inertia of the DC grid side for the whole distribution network. Using the subsequent addition of the improved layering strategy, the system inertia time is used to visually evaluate the DC system for inertia size analysis, and the conclusion that the capacitance value outside the system is too small to cope with the external disturbance changes is found. The virtual inertia analysis of the system is also performed to grasp the relationship between the increasing level of virtual inertia and the size of the applied capacitance. After test in mathematical simulation software, it was verified that the addition of virtual relational control can change the instantaneous absorbed power emitted by the system, thus ensuring that the bus voltage changes within a reasonable range.
Design of Horizontal Tail Hook of Power System
Authors: Qian Yong , Ren Shuang , Li Xin , Wang Xiaobing , Shen Amei
Published: July 2021

Nowadays, power distribution table and line branch in power system often need to install drop-out fuse for distribution and closing of line branch. Drop-out fuses in prior technology generally support iron at the upper and lower ends of insulating porcelain post. The fuse tube is secured to the fuse using the upper contact spring, the suspension hook and the lower pressing plate and shackle. The lower end locking mechanism will loosen when the fuse breaks out. The upper end of the fuse tube is separated from the upper suspension hook, affected by gravity. The entire fuse tube centers the lower-end rings. To design a scheme to solve the difficulties in large operating angle and laborious operations.
A crisscross-like Fe2N-Ni4N heterostructure with both sulfiphilic and lithiophilic properties enabled high performance lithium-sulfur batteries
Authors: Liu Jintao , Chen Junsong , Liu Xingquan
Published: July 2021

Li-S batteries have been recognized as one of the most promising candidates for next-generation energy storage systems, however, their practically commercialized applications are severely hindered by the shuttle effect of lithium polysulfides (LiPSS), retarded conversion kinetics and the growth of lithium dendrites. Herein, a vertically growing layered NiFe-LDH derived Ni4N-Fe2N heterostructure cross-like nanoarrays on a carbon cloth (CC) (denoted as CC@Ni4N-Fe2N@C) was constructed by a pot of hydrothermal method followed by the subsequent carbon coating and nitridation processes to synchronously tackle the above challenges related to Li-S batteries. This heterostructure presents good sulfiphilic and lithiophilic properties and can be directly used as the host materials both for S and Li. As-expected, this heterostructure exhibits the significantly improved discharge specific capacity, rate performance and cycle stability compared with the single-metal nitrides (CC@Ni4N@C and CC@Fe2N@C). The study of the symmetric cells certifies that this heterostructure can expose the abundant lithiophilic active sites to achieve the homogeneous Li deposition and effectively suppress the growth of Li dendrites.
Simulation of conducted emission voltage method for DCDC converter in electric vehicle
Authors: Li Jianqun , Xiong Fei , Zhu Linpei
Published: July 2021

In order to quickly predict the conducted emission (CE) of electric vehicle (EV) DC/DC converter, a co-simulation analysis method based on HFSS-simplorer is introduced. The detailed 3D models of magnetic devices, PCB board and metal structure, and the active device nonlinear models are added to the co-simulation circuit. The method is used to simulate and analysis the EMC performance of the conducted emission of the actual electric vehicle DC/DC converter, the simulation results are in good agreement with the test results in magnitude, trend and peak values, which shows that the method is feasible and practical.
Study on energy saving robot used for screw hole cleaning of reactor vessel in nuclear power plant
Authors: Chen Jun , Zhang Tao
Published: July 2021

Reactor holes can become stuck due to high temperature, high pressure, prolonged bonding, and load changes due to pressure changes in the reactor. To seal pressure in the reactor vessel, the threaded surfaces of the bolt holes shall be cleaned to remove any foreign matter that may be present in the bolt holes. The worker may manually enter the stud hole for the stud hole cleaning, but the worker’s radiation exposure is increased. Robots are an effective way to work in dangerous areas. Therefore, we introduced robots to clean the stud holes. The positioning of mobile robot is generally based on the mileage, but with the increase of the mileage, the position error will accumulate continuously. In order to eliminate the accumulated error and ensure the stability of the drive, a laser sensor and a new control algorithm are adopted. The distance between the robot and the wall is measured by the laser sensor, and the control algorithm is implemented. The value measured by the sensor moves along the desired trajectory. The actuation performance and hole sensing performance of the robot are verified by field application.
Research on energy conservation and emission reduction technology of free-form surface thermosetting forming composites
Authors: Jing Xishuang , Duan Yingzhu , Zhang Chengyang , Chen Siyu
Published: July 2021

Thermosetting composites will produce spring-back deformation after curing, and the mold is the key factor affecting the curing of components. In this paper, the solidification and spring-back deformation process of free-form surface composite parts are simulated by finite element simulation. By comparing the deformation of components under invar steel mold, 304 stainless steel mold and composite mold, the influence of thermal expansion coefficient, mold structure and molding process on the curing deformation of composite materials was analyzed, and the optimal molding scheme of free-form surface composite parts was obtained.
Assembly Automation Technology of the Stand Type Transformer Using Power System Gripper Cable
Authors: Pan Peifeng , Yang Zhiyi , Li Longda , Jin Xinsheng , Wu Tao
Published: July 2021

The cold crimping process of the lead wire of the vertical transformer of the clamp cable is a commonly used manufacturing method in the current transformer manufacturing process. Its advantages are: clean, simple, reliable, and convenient, which satisfies the manufacturing needs of high-voltage electrical products. However, due to the diversity of the lead cross-sectional area, in actual operation, it is often necessary to fill between the lead and the terminal, and there are many optional specifications for the filling line, which may easily lead to inconsistent filling methods and unclear filling standards. Aiming at a kind of vertical transformer primary winding structure and primary cable lead assembly automation research. The improved cold crimping of the lead includes two parts: the tightening and rounding of the lead and the filling of the lead copper tube as the preparatory process before the cold crimping. The post-assembly paper uses machine learning algorithms to simulate and model the wiring reliability of the connected vertical transformer, and evaluate its assembly automation level. The research results found that the wiring method proposed in the paper can improve the reliability of the wiring and the assembly efficiency is higher.
Research progress on hydrothermal oxidation technology to treat oily sludge
Authors: Gao Guoning , Yu Tao , Liu Tianle , Sun Xuan , Chong Faguo , Zhang Xiaofei , Qu Chengtun
Published: July 2021

Oily sludge is the production and collection of a mixture of oil and sludge produced during crude oil processing. It contains crude oil, heavy metals, organic toxins, and harmful substances. It is characterized by high water content, poor fluidity, and large volume. Recycling and disposal have always been important aspects of environmental protection in the petroleum industry. Therefore, the safe treatment of oily sludge is particularly important. Hydrothermal oxidation technology is an emerging technology in which the treatment of oily sludge is comprehensive and without secondary pollution. This article describes the basic principles and research progress of wet oxidation and supercritical water oxidation and focuses on the latest experimental research, advantages and disadvantages, and development prospects in the treatment of oily wastewater.
Preparation of Deep-sea Refined Salt by Solution Crystallization Technology
Authors: Zhang Li , Zhang Yanan , Hao Xiaocui , Ma Laibo , Gao Chunjuan
Published: July 2021

Deep seawater is a high-quality resource with development potential. Therefore, deep processing of deep seawater can achieve greater economic benefits. In this paper, the deep seawater concentrate after membrane separation was used as the raw material, and the deep-sea refined salt was prepared by the solution crystallization technology. By controlling the process conditions, a deep-sea refined salt product that meets the requirements of the standard was prepared.
Analysis on the changes and differences of carbon emissions in different industries based on the research of various provinces in China
Authors: Wang Yudan
Published: July 2021

To provide recommendations and basis for reducing China’s carbon emission intensity and achieving ecologically sustainable development by analysing the changes and differences in carbon emissions of different industries in various provinces in China. By using the Gini coefficient as a research indicator, analyse the differences in carbon emissions of different industries, the contribution of differences in carbon emissions of various industries to the differences in total carbon emissions, as well as the changes in carbon emissions differences and the reasons for the changes. The production and supply industries of electricity, steam and hot water are the main sources of carbon emissions, and structural effects, distributional effects, and cross-effects have played a role in promoting the reduction of differences in carbon emissions.
Research progress of supercritical water oxidation technology for oily sludge treatment
Authors: Liu Tianle , Yu Tao , Gao Guoning , Sun Xuan , Chong Faguo , Zhang Xiaofei , Qu Chengtun
Published: July 2021

Supercritical water oxidation (SCWO) technology is efficient and offers significant development potential for hazardous waste treatment. The use of water in a supercritical state with special physical and chemical properties for refractory organic matter processing offers significant advantages. This article summarizes (i) the mechanism of SCWO technology and its research progress for oily sludge treatment; (ii) the effects of reaction temperature, pressure, residence time, oxygen ratio, catalyst, antioxidant, and other factors on oily sludge treatment; and (iii) problems in the current process. Finally, SCWO technology for the future development of oily sludge treatment is discussed.
Optimal Scheduling Strategy for Electric Vehicle Charging Based on Particle Swarm Optimization Algorithm
Authors: Liu Dunnan , Wang Lingxiang , Li Hua , Gao Yuan , Peng Xiaofeng , Liu Mingguang
Published: July 2021

The development of power demand side resources provides new opportunities and challenges for the advancement of energy revolution. Flexible loads such as electric vehicles provide a large number of load regulation resources for the power demand side, while distributed energy sources provide energy supply for the power demand side. Reasonable utilization of these flexible loads and energy supply facilities will be conducive to promoting the balance between supply and demand of the power demand side, promoting the development of new energy and improving the social and economic benefits. Considering the resource characteristics of electric vehicles and distributed energy, this paper sets up an optimal scheduling strategy based on particle swarm optimization algorithm. The grid-connected consumption of distributed energy is realized through charging and discharging load regulation of electric vehicles, which effectively saves the grid-connected cost of distributed energy and improves the market income of distributed energy operators and electric vehicle operators.
Research on System Optimization of Integrated Energy Park Based on Time-sharing Electricity Supply
Authors: Ma Chunyan , Duan Qing , Sha Guanglin , Zhao Caihong , Gao Jian
Published: July 2021

Integrated energy system can improve the overall utilization efficiency of energy, and its advantages are remarkable. The integrated energy system covers various types of energy, such as electric energy, natural gas, and so on,which can realize the integration and complementarity of various energy sources in the park, which can improve the comprehensive utilization efficiency of the park system as a whole and reduce the cost of comprehensive energy use. In this paper, a multi-energy coupling energy system is constructed based on a typical park integrated energy system. By modelling the typical equipment in the system and using the time of using supply as the guiding strategy, the particle swarm optimization algorithm is used to optimize the typical days of the park, and the optimal operation strategy of the equipment in the system is obtained, which can significantly alleviate the peak and valley phenomenon between the system and the superior network.
Defect Signal Detection of Station Process Pipelines Based on the BP Neural Network
Authors: Jiang Yi , Liu Yuting , Yu Dongliang , Li Feng , Chen Ge , Di Xin
Published: July 2021

In recent years, leakage, rupture, and perforation accidents in oil and gas pipelines caused by corrosion have increased significantly. Therefore, the online, nondestructive testing of oil and gas pipelines has become essential to maintain their structural integrity. Ultrasonic guided wave detection technology presents advantages, such as high detection efficiency and complete coverage of the pipeline body, which is conducive to popularization and application. This paper considered the natural gas transmission station as the research object, while ultrasonic guided wave technology was used for detection. Ultrasonic guided wave equipment was used to detect the field process pipeline and experimental pipeline, obtaining data samples of the defects and welds. Defects were automatically identified via data processing by combining the characteristic signal method and the BP neural network. The results indicated that the neural network displayed a recognition accuracy of 80.9% for the features and defects in the test samples. By combining the characteristic signal method and the BP neural network, the defect recognition technology can reduce the subjective influence of inspectors while improving recognition efficiency and accuracy.
Effect of microbial consortium on Ricinus communis L. seedling in Pb/Zn-contaminated soils
Authors: Li Xue , Yang Fengyi , Wu Meiqun , Luo Fang , Wang Jing , Li Tingjie
Published: July 2021

In order to investigate the effects of lead-zinc resistant microbial consortium on growth of Ricinus communis L., fungus L14 and the bacteria X8 from the soil in the lead-zinc mining area were collected as the microbial consortium of heavy metal-tolerant plant growth-promoting. The effect of compound functional flora on the growth of Ricinus communist L. seedlings was investigated. As the concentration of lead and zinc increased, the growth indicators of castor plant seedlings all reduced sharply. It can be seen that the higher the concentration of lead and zinc was, the greater the toxic effect on castor, and the more inhibited root growth. In inoculate group, the root length and stem height increased by 2cm and 2-3cm on average compared with the non-inoculated group.
Research on New Energy Technology in Energy-Saving and Emission-Reduction Low-Pollution Aerospace Engine
Authors: Nie Jinlong , Chen Lei
Published: July 2021

Under the national energy technology call for energy saving and emission reduction, the paper uses FLUENT software to simulate three-dimensional, two-phase, turbulent combustion in the combustion chamber of a certain type of aeroengine at the maximum and ground idle state and calculates the generation of CO and UHC. The value of temperature field, velocity field and concentration field. Through simulation, it is found that the maximum temperature of the flame is located at the axial position of the main combustion hole. The flame temperature begins to decrease after reaching the maximum temperature near the main combustion hole. In the temperature field of the combustion chamber outlet, the maximum temperature of the outlet section is 1820K and the average temperature is 1342K.The temperature distribution is relatively uniform overall. CO and UHC are mainly generated under low operating conditions, but the oil-gas ratio has a greater impact on pollutant emissions.
Vertical seismic analysis of roof truss in Indonesia
Authors: Chen Shixi , Huang Youqiang
Published: July 2021

Based on a 1×680MW thermal power plant in Indonesia, the large-scale general finite element software ABAQUS was used to analyze the vertical seismic time history of the steel roof truss of the main plant of the thermal power plant, and study the vertical seismic effects of different seismic areas and site types on the steel roof truss Impact. Through analysis, a table of vertical seismic action coefficients of steel roof trusses with different parameters (the ratio of the standard value of vertical seismic action to the representative value of gravity load in frequent cases) is given for future engineering design reference.
The effect of five kinds of colloidal polymers for seed germination and growth in sand
Authors: Zhang Wenxu , Guo Lulu , Chen Jing , Liu Shengfang , Wang Yifan , Chen Wenxiao , Lei Ziqiang
Published: July 2021

The effect that five kinds of colloidal polymers did to seed germination and growth in sand was studied through orthogonal experiment in this paper. The water consumption, germination rate, growing and shoot length of five kinds of plants were investigated by changing the type and amount of natural colloidal polymers, soil and bio-fertilizer. Furthermore, the soil crust effect and the biomass of soil around sand seeds were analyzed in different conditions. It can be seen from the analysis of variance result that the types of colloidal polymer played a crucial role in water consumption of seed, and the water consumption was the smallest when Konjac Glucomannan was added with 911.14g/g. And the primary factor was plant species that effected germination rate of seeds, growing and plant height. Besides, the soil depth, plant species, polymer type and mass of polymer significantly influence the soil crust effect all. However, the amount of bio-fertilizer played an inhibiting part on biomass of soil.
Torsional vibration test and analysis of an internal combustion engine power assembly by RLV-5500
Authors: Wu Ji , Long Jun , Zhang Chunlei
Published: July 2021

The vibration characteristics of marine power plant and propulsion system shafting directly affect the navigation safety of the ship. Shafting torsional vibration is an important parameter to evaluate the stability and reliability of shafting. The demand of ship shafting torsional vibration measurement is gradually developing towards high resolution and high accuracy. According to the characteristics of ship shafting installation and operation, this paper selects an internal combustion engine powertrain as the test object, and uses rlv-5500 rotary laser vibration measurement system to test the shafting torsional vibration. The time-frequency analysis of the test results is carried out to calculate the comprehensive angular displacement and the angular displacement amplitude of each harmonic order. The maximum comprehensive amplitude of crankshaft free end torsional vibration is 0.33 °. The crankshaft will not be damaged by torsional vibration.
Study on The Mechanism of Flexible Demand-Side Resources Participating in The Electricity Market Under New Situation
Authors: Liu Dunnan , Wang Lingxiang , Gao Yuan , Li Hua , Pang Bo , Song Li , Liu Mingguang
Published: July 2021

The high proportion of renewables added to the electricity system and the “dual carbon target” require more adjustable resources to keep the power system running smoothly. The flexible resource of demand side is an important adjustable resource, which can help the safe and reliable operation of power system. This paper considers the way that demand-side resources participate in load regulation through the power market, discusses the types and characteristics of demand-side resources, analyses the trading mechanism of demand-side resources participating in various types of markets, and puts forward the benefit calculation methods under different scenarios, which has important reference significance.
Research on the reaction temperature of PTFE/Al reactive materials
Authors: Zou Xuan , Zhou Jingyuan , Ran Xianwen , Wu Yiting , Liu Ping , Tang Wenhui
Published: July 2021

In order to learn about the energy release characteristics of PTFE/Al (Teflon/aluminum), samples with a mass ratio of 73.5: 26.5 (PTFE: Al) were designed by the molding-sintering process. The drop hammer device and spectrometer system were selected for the experiment. By analyzing the spectrum of the reaction flame, the reaction temperature was calculated. At different drop heights, the reaction temperature changes little, and the standard deviation of reaction temperature of PTFE/Al is 14.90. We believe that the reaction temperature of PTFE/Al does not change with the height of the hammer drop, and the average reaction temperature of PTFE/Al under different drop hammer heights is 2733.41±14.9K.
Spatial Sensitivity Analysis and Structure Design of the Ring Electrostatic Electrode
Authors: Chen Jiange , Jiao Min , Li Dewen , Lu Siyuan , Yan Gelai
Published: July 2021

In order to accurately detect the dust concentration in the open space, this paper designed a dust concentration sensor based on the ring electrode of the electrostatic induction method. According to the size of the fan and the maintenance needs of cleaning in the pipeline, the inner diameter of the ring electrode was designed to be 40mm. The high-fidelity three-dimensional finite element model of the ring-shaped detection electrode was established by COMSOL software, and the electrostatic field distribution in the ring-shaped electrode was simulated. The spatial sensitivity of the ring electrodes was calculated under the condition of different length and thickness of the ring electrode. By analyzing the distribution of the spatial sensitivity of the ring electrode, the length of the ring electrode was designed to be 40mm and the thickness was designed to be 2mm, which ensure that the axial spatial sensitivity of the ring electrode is relatively large and the radial spatial sensitivity is relatively uniform. This research result provided a reference for the structural design of the ring electrode.
Prediction of the thermal safety of nitrocellulose package in large scale
Authors: Wang Qiong , Du Jiaojiao , Gu Yan , Yu Silong , Zhang Linjun
Published: July 2021

In order to assess the risk of nitrocellulose (NC) package atuo-ignition in warehouse, the three kinetic parameters of thermal decomposition of NC were calculated based on DSC curves using commercial software AKTS-kinetic module. On this basis, effects of ambient temperature (Ta), initial temperature of the package (T0) and cylinder diameter of package on time to ignition (τ) were studied using AKTS-thermal safety module. Results showed that as Ta and/or T0 increases the τ decreases exponentially, but the τ at different package dimensions is related to the Ta. More importantly, for a certain Ta, the τ doesn’t always change monotonously with the dimension, there is a dangerous dimension which are easier to ignite. It indicates that big risks exist when trying to predict the safe status of a certain NC package by extrapolation.
The comprehensive treatment of industrial wastewater and its recovery and utilization technology
Authors: Han Yun
Published: July 2021

With the acceleration of industrialization in China, the phenomenon of industrial pollution has become more and more serious, which has caused a great hazard on the ecological environment. The quantity and scale of industrial wastewater continue to increase, and higher requirements are put forward for the treatment of industrial wastewater. Firstly, this paper analyzes the function and importance of industrial wastewater treatment. Secondly, we proposed the comprehensive treatment of industrial wastewater and its recovery and utilization technology. The comprehensive treatment of industrial wastewater is completed by the backwashing of biochemical tank, the dehydrating of sludge thicker and the effluent from disinfecting tank. The recovery and utilization technology of industrial wastewater is designed. By recovery industrial wastewater, the usage amount of reuse water is increased.
Study on Technology of Bulge and Crack Repair in Epoxy Asphalt Pavement of Steel Bridge Deck
Authors: Qin Kesheng , Yang Fei , Fu Jiancun , Han Tao , Liu Fangtao
Published: July 2021

This project mainly combines the operation characteristics of epoxy asphalt pavement of steel bridge deck in the north frozen sea environment, and judges the cause and degree of damage of epoxy asphalt pavement of steel bridge deck according to the manifestations of swelling disease and related detection indexes. Combined with the formation mechanism of the disease, the corresponding treatment scheme of bulge and crack is put forward, so as to achieve the purpose of identifying and treating the disease of epoxy pavement of steel bridge deck.
Experimental study on the treatment of rural domestic sewage by modified MBBR sludge and bio-membrane coupling integrated process
Authors: Zhu Xiaoming , Shu Mengzhao , Ge Jun , Wang Xiao , Huang Shenglin
Published: July 2021

Experimental study on the treatment of rural domestic sewage by modified MBBR sludge membrane integrated process was carried out, to investigate the removal of organic matter and nitrogen and phosphorus pollutants in sewage by this process technology under different pollution loads. The results showed that the COD, NH4
+-N, TN and TP concentration of the influent were 114-214 mg/L, 3.49-16.3 mg/L, 14.4-58.5 mg/L and 0.94-2.68 mg/L, respectively. The COD, NH4+-N, TN and TP concentration of the effluent of the modified MBBR sludge membrane integrated process can meet the Class I level A standard of discharge standard of pollutants for municipal wastewater treatment plant of China. The comparison of process performance under different pollution load conditions showed that the process equipment had good shock load resistance ability. The effluent indicator of the process equipment basically met the Class I Level A standard. Therefore, the modified MBBR sludge membrane integrated process is used in rural domestic sewage treatment, and has a higher comprehensive removal ability of pollutants.