bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effects of Different Land Use Patterns on Soil Organic Matter and Soil Cycle Process
Authors: Li Xia , Jin Xin , Song Ying 
Published: July 2021

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

AbstractReactor 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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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

Abstract
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.