bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development trend analysis of variable oxygen concentration combustion research based on bibliometrics
Authors: Wang Yiqi , Chen Lei , Zhang Dingran 
Published: May 2021

Abstract
Based on CiteSpace, 955 journal literature related to variable oxygen concentration combustion research collected in the web of Science (WOS) core database were analyzed visually. The results show that: 1 Literature publication trends. According to the total number of published literature, it can be divided into three stages: initial development, steady development, and rapid development. 2. Analysis of the author’s co-occurrence map. The author’s cooperation network in this field is obvious, but the overall cooperation network presents a “core-edge” structure, and the cooperation of academic teams is scattered. 3. Research hotspots, the related research mainly focused on the combustion characteristics of polymer synthetic materials, and chemical cycle combustion related to the field of energy and power engineering. 4. Research on the frontier trend. At present, “mechanical property” and “Nanoparticles” are the keywords representing the latest frontier trend in this field.
The Evaluation of Coal Mine Safety Based on Entropy Method and Mutation Theory
Authors: Mi Xin , Cao Qinggui , Li Dan , Wang Junqing 
Published: May 2021

Abstract
In order to accurately evaluate the safety status of coal mines and improve the safety level of coal mines, the method of evaluating the state of coal mine safety combined with entropy method and mutation theory is proposed. By analyzing the influence factors of coal mine safety status, 17 evaluation indicators were established from the four aspects of employee quality, equipment facilities, natural conditions and safety management, and the evaluation index system of coal mine safety status was established. Based on this evaluation model and process, the safety status evaluation and analysis of the example coal mine are carried out, and the evaluation results are consistent with the actual safety status of the coal mine, which confirms the reasonable feasibility of the evaluation method. This method can be used to evaluate the safety status of coal mine and provide the basis for the formulation of safety countermeasures.
Intercropping Effects of Sophora davidii and Silage Maize on Soil Physicochemical Properties, Enzyme Activities and Yield
Authors: Zou Chao , Ding Leilei , Zhang Yujun , Wang Puchang , Chen Chao , Long Zhongfu 
Published: May 2021

Abstract
Crops-beans intercropping has the advantages of efficient utilization of light energy, space environmental resources and increasing land productivity. People have done a lot of research on the yield and soil nutrient utilization of grain crops intercropping system, which proves that crops-beans intercropping is of great significance in production practice. However, there is little research on the soil properties and yield affected by intercropping forage grass with shrub legume. In order to explore the ecological value and yield effect in the intercropping mode of shrub legume and forage grass, and to provide the high-quality forage resources in the region, we selected Sophora davidii and silage corn for field intercropping experiment. To study the benefit of intercropping and the feedback regulation between crop yield and soil fertility. The results showed that the land equivalent ratio was 1.501 under intercropping mode, and intercropping silage corn between S. davidii rows could improve the land use efficiency, and compared with S. davidii monoculture system, the land yield increased by 1286.4% in fresh matter and 738.5% in dry matter. At the same time, intercropping increased the content of available N in soil and promoted the sustainable utilization ability of soil. This has important enlightenment for the restoration area of S. davidii planting in karst area, taking into account the restoration effect, improving soil, increasing grass and increasing efficiency.
Research on High Cycle Fatigue Performance of Q345B
Authors: Zhu Pengxiao , Wen Jun , Li Yi , Zhang Dongya , Ma Xuejiao 
Published: May 2021

Abstract
The high cycle fatigue properties of Q345B were studied by optical microscope, conventional mechanical properties and fatigue tests. The results showed that the microstructure of hot-rolled Q345B was ferrite + pearlite, and the inclusions were MnS. In the case of high fatigue strength, the dispersion of fatigue life was low. With the decrease of fatigue strength, the dispersion of fatigue life gradually increased. The fatigue crack initiated at the MnS inclusion on the subsurface.
Analysis of deformation and failure characteristics of soft and broken surrounding rocks of super-large section tunnel constructed using benching tunneling method
Authors: Wan Fei , Fu Chongtao , Zhou Changwu , Li Lei , Zhang Xuan 
Published: May 2021

Abstract
The benching tunneling method can overcome the problems of insufficient working space and low construction efficiency in the soft and broken surrounding rock tunnel with super large section, but the design and construction theory and method are under developing. In order to solve the problem of insufficient basis for the design of the large-section bench method in the weak and broken surrounding rock, a three-dimensional elastoplastic model was established. The deformation and fracturing of the surrounding rock outside the tunnel excavation profile and in front of the tunnel face were used as indicators to analyze the deformation and failure characteristics of the weak and broken surrounding rock under benching tunneling method. The calculation results show that the grade of surrounding rock worsens (grade IV-V). Depending on the initial support design conditions, instability of the supporting structure or the tunnel face may occur. In the condition that grade of surrounding rock does not lose stability, the leading deformation accounts for a larger proportion of the whole deformation, indicating that the leading deformation is the key to the stability control in the benching tunneling method. When the tunnel face is unstable, the surrounding rock within 4.5m in front of the tunnel and 1.5m above the arch collapses, and the deformation and damage develop from the vault down to the foot of the wall.
Evaluation and Repair of Construction Damage to an Old Factory Building
Authors: Wang Hongnan , Liu Huabo 
Published: May 2021

Abstract
This paper describes the performance based seismic rehabilitation of an old four-story RC frame building which is being remodeled to be reused as an office building in the creative industrial park. The building is part of the city’s adaptive reuse and redevelopment program. It was designed and constructed in the 1980’s and, therefore, does not meet current design and detailing standards. To make matters worse, two of the first floor columns were badly damaged during renovation and were in danger of collapsing at any time. This paper presents the effects of the accident, failure mechanism, as well as the actions taken to repair the building. The damaged columns are strengthened by a reinforced concrete jacket. The beams closer to damaged columns are retrofitted by externally bonded CFRP. Structural redesign made it feasible to rehabilitate and strengthen the structure sufficient to meet seismic criteria that were judged to be compatible with the site conditions.
Research on Application of Wall Construction Technology in Building Construction - Case study on the Modern Art Design Teaching and Training Center Building of Shanghai Art & Design Academy
Authors: Liu Zhen 
Published: May 2021

Abstract
Wall cracks is the most commonly seen wall quality issue in the construction of industrial and civil architectures. The areas where cracks occur are also extensive, including the connection parts of masonry infill walls, concrete beams and columns. This article is based on the case study of lightweight wall panels utilization in the interior wall project of the Modern Art Design Teaching and Training Center Building of Shanghai Art & Design Academy. In view of cracks commonly experienced in the new wall materials, projects should fully consider various elements including joint stress, construction operation, putty treatment, construction environment, design and other factors, analyze the root cause, and get repair in place (strengthen the mortar joint, strictly follow the construction operation procedures, and strengthen the lightweight wall panel Installation). It is also pointed out that flexible treatment is an effective method for wall repair and damage prevention, which can effectively control the cracks at the joints of the lightweight wallboard and the cracks on the board surface.
Transient Analysis Based on Finite Element Method for Ball Grid Array Package
Authors: Luo Wenhao , Su Wei , Dong Xianshan , Nie Zhenhua , Tomar Agam 
Published: May 2021

Abstract
In this paper, finite element simulation is carried out for BGA sample. The authors establishes the model of fixture, ceramic panel and metal sheet. Based on this model, several layers papers are laid on the metal sheet for simulation test. Then, ANASYS Workbench is used to conduct transient analysis of the samples to study the influence of different thickness papers on acceleration and time. The results provide useful reference for the adjustment of dynamic response parameters.
Research on 3D Contrast Image Segmentation Based on an Improved Otsu Algorithm
Authors: Wu Xiaoling 
Published: May 2021

Abstract
This article mainly introduces typical segmentation methods of medical images, especially when using the advantages of threshold segmentation when segmenting blood vessels, and it is effective when selecting the principle of maximum between-class variance and global threshold. Sex is explained. Based on this, the key role played by the local threshold in the segmentation of angiographic images is explained. In addition, the block method used in this article is a fixed size. Considering when the block size can show the best segmentation effect, the article proposes an index that can determine the block size, namely block the rate of change of the internal standard deviation of the image, and the proposed method is also demonstrated.
Dynamic Optimal Configuration Method for Distribution Network Based on Multidimensional Reliability Improvement
Authors: Guo Haoming , Chen Yinghua , Jiang Yinghan , Liao Mengke , Liu Wenxia , Huang Yuchen 
Published: May 2021

Abstract
The power supply company has invested a lot of money to enhance the reliability of the distribution network by improving the grid structure, increasing the level of distribution automation, and increasing the coverage of live operations. However, blind investment will cause a lot of waste of assets. In view of the current situation, this article firstly constructs a reliability calculation model based on the minimum path method, which considers the mutual influence of multiple methods. Then, from the perspective of the life cycle, a corresponding life cycle cost (LCC) model is established. Next, based on grid search, a multi-dimensional dynamic optimal configuration method of distribution network considering the full life cycle is presented. Finally, this paper takes a regional distribution network as an example, and verifies the validity of the model through simulation calculations. The research results can provide a theoretical basis for the investment of distribution network assets.
Economic Stimulation Signal on Power Supply Optimization From Distribution Cost Allocation Based on Shapley Value in Integrated Energy Park
Authors: Gao Xiao 
Published: May 2021

Abstract
This paper discussed the economic incentives of the distribution cost distribution based on the Shapley value of cooperative game in the integrated energy service park for the optimization of the park’s power supply mode. The application of cooperative game in the distribution of power distribution costs gives an economic signal reflecting the difference in power supply to users in the park. In the concept of multiple solutions in cooperative game theory, the Shapley value determines the power flow contribution of each user to the power grid with its uniqueness, determines the user’s power distribution cost based on the power flow, and its economic background also clarifies the user’s responsibilities, and the user chooses differently. The power distribution costs borne by the power supply are also different, thereby promoting power supply optimization. The 5-node calculation example verifies the effectiveness of the distribution cost allocation based on the Shapley value for the economic incentive of power supply optimization.
Machine Learning in Smart Home Energy Monitoring System
Authors: Xiao Gengyi 
Published: May 2021

Abstract
In order to solve the insufficiency of the existing smart home energy monitor ing system in autonomous adaptability, a smart home energy monitoring system based on machine learning and embedded technology is proposed. The system uses a gatewa y to collect sensor data, and then uses a cloud computing platform running Hadoop and machine learning algorithms to learn and identify user behaviours to achieve autonom ous decision-making capabilities. Through the analysis of examples, it can be seen that the solution greatly improves the humanization of the smart home system.
Numerical studies on fluid-structure interaction of a liquid-filled tank with baffles
Authors: Duan Linlin , Yang Zhirong , Liu Cenfan , zhang Chongchong , Deng Guide 
Published: May 2021

Abstract
CFD is used to simulate liquid sloshing which affects the safety of baffles in this study, a three-dimensional model of a tank is established. The fluid-structure interaction method is applied to analyze the liquid sloshing phenomenon, deformation and stress of baffles during the acceleration. The distribution of liquid phase in a tank with 0.5 and 0.8 liquid filling ratios are studied. Force distribution of the baffles at different times under 0.8 liquid filling ratio is researched to obtain deformation and stress of baffles under this condition. The simulation results show that the liquid distribution in a tank with 0.8 liquid filling ratio is more stable than that with 0.5. During the acceleration process of the tank with 0.8 liquid filling ratio, the deformation and stress of the baffles are inversely proportional. The roots of baffles suffer from large stress, which is easy to crack under certain conditions. It should take protective measures at the root of the baffles to avoid cracking.
Research on optimization control of vehicle road noise performance
Authors: Su Jintao , Lou Jianping , Jiang Xiaolu 
Published: May 2021

Abstract
By analyzing the road noise problem of a car model, it is confirmed that the car exists in the car when driving at uniform speed on rough road surface. The front and rear row road noise problem. Based on the existing vehicle CAE model, the TPA analysis of the vehicle model was carried out by using MSC NASTRAN software to obtain the contribution of each transfer path to road noise, and the main path influencing the road noise was locked. The key factors on the main path are further identified through acceleration response analysis of key positions in the transfer path. Through vehicle test and ODS simulation analysis, the main vibration modes of the components that affect the road noise are determined. Combined with CAE and test methods, a reasonable chassis optimization scheme was developed to improve the road noise performance of the vehicle.
Research on Campus Attendance System Based on Face Recognition and Trajectory Tracking
Authors: Cao Fengping , Zhu Lin 
Published: May 2021

Abstract
The traditional Morning jog attendance in colleges and universities is limited to manual supervision by swiping card attendance, which is prone to queuing and sign-in on behalf of others. In addition, the lack of quantitative records of exercise data makes supervision difficult. Location-based attendance systems represented by Dingding time attendance, or simple face recognition attendance systems cannot achieve accurate attendance. The campus happy running system based on face recognition and trajectory tracking innovatively combines face recognition and trajectory tracking, and students achieve accurate attendance certification within the designated “geo-fence”. Practice shows that the system can meet the special needs of colleges and universities for Morning jog attendance and data recording, and it effectively improves the accuracy of identity verification.
Project Research Based on Electronic Engineering Innovation Practice
Authors: Chen Ze , Zhong Xiaolei 
Published: May 2021

Abstract
In this paper, combined with the practical conditions of our university training center, puts forward the project, for traction, on the basis of the module, dominated by technology training, to cultivate students’ engineering consciousness and innovation ability as the core of electronic engineering training teaching system, to adapt to the “double top” and innovation personnel training in our university. The teaching system and content, through one year’s teaching practice, integrates the design of the project, the design and production of PCB, the testing of electronic components, the assembly and debugging, the writing and defense of the science and technology report, and the teaching effect is very significant and is well received by the students.
Analysis and Research on Factors Affecting the Reliability of Medium Voltage Power Supply
Authors: Duan Weidi , Jia Junqing , Si Qin , Dong Wenjuan , Deng Fengting 
Published: May 2021

Abstract
With the continuous development of social economy, the demand for electricity is increasing day by day. Power users have higher and higher requirements on the reliability of power supply. In case of grid failure, The impact on businesses and individuals is also growing. The reliability of medium voltage power supply system has been paid more and more attention. The reliability of medium voltage power supply has a direct impact on users’ satisfaction with electricity consumption. Power supply reliability has become an important index to reflect the continuous power supply capacity of enterprises. Power supply enterprises pay more attention to power supply reliability year by year. Improving the reliability of power supply for medium voltage users has become an important part of reliability management. The author summarizes the work experience, the main factors affecting the reliability of medium voltage supply are analyzed. The measures and methods to improve the reliability of medium voltage power supply are put forward.
An Image Enhancement Method Based on Partial Differential Equations to Improve Dark Channel Theory
Authors: Li Pengcheng , Gu Xiaohui 
Published: May 2021

Abstract
Image applications appears in all aspects of life, such as medical imaging, electronic monitoring, face recognition, aerial photography remote sensing, fingerprint analysis, robot vision, automatic driving, intelligent car and so on in the civil field, as well as tanks, armored vehicles, artillery, missiles, bat submunitions in the military field. However, in the process of image acquisition or storage and transportation, the image quality will decline due to environmental conditions, equipment conditions or transmission compression, and so on. In order to accurately analyze the image, we need to carry out enhancement processing. In this paper, the current research status of image enhancement methods is analyzed. The traditional dark channel prior algorithm has some problems, such as edge or texture blur and so on. The processing effect is not ideal. Considering the limitations of the traditional dark channel prior algorithm, this paper proposes a improved algorithms based on the dark channel prior by combining partial differential equation. The main work includes the following aspects. First, the partial differential equation algorithm is combined with the dark channel prior method, and the improved algorithm is applied to enhance the image with fog. The contrast experiment of enhancement effect and running time is designed to verify the image enhancement effect of the improved algorithm. Second, the improved algorithms proposed in this paper are compared with traditional algorithms. After making the subjective and objective evaluation, it is found that the improved method in this paper has better image processing effect, stronger fog and noise removal effect, better edge retention effect, more information acquisition, and higher computational efficiency.
Study of deformation manifestations in the excavation working floor when it is supported by roof bolting
Authors: Demin VF , Isabek TK , Nemova NA 
Published: May 2021

Abstract
The diagrams for supporting workings by floor and roof bolts are considered, which allow to reduce the swelling of floor rocks and manifestations of rock pressure. The degree of influence of mining and engineering factors on the bolting effectiveness of workings is established.
Stress concentration analysis in rock pillars in the framework of non-local elastic model with structural parameter
Authors: Altukhov VI , Lavrikov SV , Revuzhenko AF 
Published: May 2021

Abstract
The regularities of changes in the stress-strain state of coal in rock mass depending on the main mining geological and engineering factors are identified. Using these factors, it is possible to find the optimal support parameters in specific conditions to increase the stability of preparatory mine workings. The degree of influence of mining and engineering conditions of exploitation on displacements in marginal rocks with various types of support in excavation workings is investigated.
Measuring system to investigate geo- and gas-dynamic processes in hydraulic fracturing of coal seams
Authors: Drobchik AN 
Published: May 2021

Abstract
A measuring system has been developed for a test bench allowing the study of gas-dynamic processes in large-sized rock samples when performing hydraulic fracturing of a coal seam in a borehole model. This system provides collection of the data on pressure in a hydraulic fracturing device and loading of pneumatic jacks which create compressive stresses in the borehole zone, it also records acoustic emission during crack formation. An additional capability is implemented to measure the flow rate of gas supplied to sample through the holes on its side wall and pumped from the borehole.
Adsorption properties of Kemerovo manganese ore toward zinc
Authors: Kovalenko KA 
Published: May 2021

Abstract
Zinc is a toxic and a prevailing pollutant contained in wastewater in nonferrous metallurgy. With a view to ensuring the environmental safety, it is required to develop an integrated wastewater treatment technology to remove heavy metals from effluents. A promising approach to natural and waste water treatment is adsorption using various natural materials. The author analyzes the adsorption capacity of manganese ore from Durnovskoe and Usa deposits toward zinc in static conditions. The adsorption isotherms are described by the Langmuir equation at a high correlation factor. The maximal adsorption capacity, the sorption equilibrium constant and the change in the Gibbs energy are evaluated. Usa manganese ore reveals higher adsorption capacity toward zinc.