bluuebunny/crossref_metadata_2025_split huggingface dataset:
An improved genetic algorithm for low carbon dynamic scheduling in a discrete manufacturing workshop
Authors: Li Nie , Wang Xiaogang , Bai Yuewei 
Published: March 2021

Abstract
Due to energy consumption activities, manufacturing enterprises produce many carbon dioxide emissions in the production process, which exacerbates global climate deterioration. The production scheduling optimization method is an effective way to reduce carbon emissions and relieve environmental pressure. The paper proposed a low-carbon dynamic scheduling optimization method to solve machine failure interference and to minimize the total cost of production and carbon emissions in the discrete manufacturing workshop. The rolling window mechanism driven by abnormal events and rescheduling strategy are used to update the original schedule in real-time when the machine fails. In the carbon emission measurement method, the machine’s carbon emission parameters in different states are considered. The traditional genetic algorithm is improved in the initial population strategy and crossover operator. The experimental results show that the proposed low-carbon dynamic scheduling method based on the improved genetic algorithm can effectively reduce carbon emissions under the premise of ensuring the completion of production tasks as soon as possible.
Failure criticality evaluation of ship propeller shaft system based on Fuzzy FMECA method
Authors: Wang Ruixin , Chen Zhimin , Zhou Taotao , Xia Yuan 
Published: March 2021

Abstract
The propeller shaft system is the key system for power transmission on board. The components of the system are complex, the working environment is bad, the failure modes are numerous, and the failure consequences are serious. FMECA (Failure Modes, Effects and Criticality Analysis) is difficult to accurately and quantitatively carry out criticality assessment. Therefore, in view of the complex navigation environment, the fuzzy FMECA method is used to evaluate the failure mode criticality of propeller shaft system. On the basis of FMECA, the factor set with maintainability and testability is established, and the factor level set, fuzzy evaluation matrix and factor weight set are determined, and the consistency judgment is made. Finally, the fuzzy comprehensive evaluation is carried out to obtain the accurate and quantifiable failure mode criticality ranking. Compared with the traditional FMECA method, fuzzy FMECA can consider the limited maintenance conditions and test conditions on board, accurately quantify the criticality degree, and take into account more expert opinions, so as to improve the authenticity, accuracy and repeatability of criticality assessment. Therefore, the fuzzy FMECA method can better evaluate the criticality degree of propeller shaft system, and the results can effectively guide the improvement of propeller shaft design and maintenance work.
Application of laser tracker in the industrial measurement field
Authors: Hu Chang’an , Luo Shutong , Li Wanze , Cai Dongyan , Li Jiangang 
Published: March 2021

Abstract
In recent years, with the rapid development of modern three-dimensional space technology, laser tracker has become a mature technology, high efficiency, stable and reliable performance of high-precision large-size measurement instruments in the industrial measurement system. In some major industries, the 3d high-precision measurement method represented by laser tracker has gradually replaced the traditional measurement method and is widely used in the installation and detection of large precision equipment. This paper mainly introduces the structure, working principle, advantage, and laser tracker applications in main industries.
Temperature Variation of Steel Plate with Different Thickness on Normalizing Process
Authors: Yanchun Lv , Zhang Yuefei , Bao Wanghai , Wang Weihua , Liu Yang 
Published: March 2021

Abstract
By placing the thermocouples inside the steel plate and measuring the actual temperature in the normalizing process, combined with the numerical calculation, the temperature variation law of different thickness steel plate is simulated and calculated. The calculation shows that the core cooling rate is the lowest at the beginning of cooling. With the decrease of temperature, the cooling rate changes and then continues to decrease. The maximum cooling rate is 0.53°C/s-0.35°C/s. When the plate surface temperature reaches 642°C-673°C, the cooling rate of steel plate surface is consistent with that of core.
Steady State Unbalance Response Analysis of Internal Combustion Engine Crankshaft Based on Torsional Vibration
Authors: Lin Wang , Chen Ni , Zhang YuBai 
Published: March 2021

Abstract
Crankshaft is one of the main moving parts in internal combustion engine. The instantaneous gas pressure and effective crank radius of each cylinder of the engine and the ignition interval angle of each cylinder make the torque of each crank change constantly, which causes the torsional vibration of the crankshaft. Based on the lumped parameter model, the transfer matrix method is used to analyze the steady-state unbalance response of internal combustion engine crankshaft, which has a certain reference value for mastering the influence of torsional vibration on the working state and strength safety of crankshaft.
Analysis and Research on Multi-layer Docking Error of Complex Interlayer Column Module Based on Point Cloud
Authors: Han Jiang , Zhang Qing , Zhang Zifeng 
Published: March 2021

Abstract
Modular design of large offshore oil and gas module reduces the construction difficulty of the whole building, but increases the cumulative error between modules. For large-scale steel structure buildings, the error between the inter-story column modules will affect the overall building stability. It is a feasible method to use point cloud to monitor the errors in real time, so as to trim the columns in time. The goal of this paper is to put forward a set of error analysis method which is suitable for point cloud pre-matching of interlayer integral column. This method includes the calculation and analysis of the center line angle error of each butt joint and the position error of butt joint center of gravity after transformation based on interlayer optimal matching. In practical work, the column structure with large error can be trimmed according to the calculated data.
Research on Intelligent recognition system of Cotton apical Bud based on Deep Learning
Authors: Li Jianliang , Zhi Xinlei , Wang Yingying , Cao Qingzheng 
Published: March 2021

Abstract
Cotton topping is a key link in the whole cotton production process, which can eliminate the top growth advantage and promote cotton production and income. The automation of cotton topping can greatly reduce the topping time and labor intensity, and the high-speed and accurate identification of cotton top buds is the prerequisite and basis for automatic topping. This article designs a cotton top bud intelligent identification system based on YOLOv3 network, which can detect cotton top buds in visible light images in real time, and provide visual information for the subsequent realization of cotton top bud position measurement and mechanical control. A computer workstation (RTX2070s) was used to identify 15049 cotton top bud images under different weather and illumination conditions. The results show that the average time of single frame image recognition is controlled within 100 milliseconds, and the top bud recognition rate reaches 96%, which creates good conditions for the development of automatic cotton topping equipment and has broad application prospects.
A review of key tools for oil pipe blockage operation in gas wells under pressure
Authors: Song Chunyuan , Hu Shoulin , He Yunbin , Yang Hai 
Published: March 2021

Abstract
Blockage in tubing is an important guarantee for gas wells under pressure. The internal blockage is to close the channel inside the tubing through a sealing device, the pipe string can be lifted and lowered under pressure. In order to prevent natural gas from leaking through the tubing channel during well completion and string lifting operations, a plugging tool in the tubing is required to block the tubing channel, and the blockage is removed after the operation is completed to effectively control the pressure in the well. This article starts with the key tools related to internal plugging operations in Snubbing operation, introduces the basic principles of setting the internal plugging barriers when running the tubing string in completion operations, and introduces the key tools for internal plugging when the tubing runs in completion operations. The internal plugging method of the pipe string under pressure is introduced. The key tools (bridge plugs) and setting methods that have been matured or formed at home and abroad when the pipe string is lifted in workover are introduced. Well technology and key tool selection provide reference. Finally, we analyze and think about the domestically developed self-developed internal plugging tools for pressurized operations in my country. It is believed that internal clogging is not an isolated process of oil, gas, and water plugging, but is usually a process of multi-system construction processes working together. The key domestic tools and equipment also need to further improve their autonomous capabilities in terms of overall performance and stability, as well as intelligence.
Progressive Failure Analysis and Experiment Research of the Composite Bolted Connection
Authors: Xi Li , Yazhi Li 
Published: March 2021

Abstract
Bolt connection is a common engineering structure. In order to analysis the composite bolted connection, based on continuous damage mechanics method, different failure criteria are established for fiber, matrix and delamination. To improve the efficiency of engineering estimation, this paper proposed the selective parabola algorithm to solve the fracture angle and uses the linear stiffness degradation method to establish the finite element model. Firstly, composite laminates with a hole in the tension stress are analyzed by using the above model, and by comparing the test results with the experimental results, the feasibility of the model is verified. Then, the progressive failure analysis is carried out to study the composite bolted connection. The comparison between the calculation results and the test results shows that the mechanical model proposed in this paper can predict the strength of composite bolted connection under tensile load accurately and also can present the damage evolution process exactly.
Research on Protection Optimization of Distribution Network Containing Distributed Power Generation Based on Sparrow Algorithm
Authors: He Yu-Hua , Luo Yi , Li An-Hao , Wang Teng-Fei , Cheng Zhe , Peng Yan-Hua 
Published: March 2021

Abstract
In recent years, the increasing energy crisis and environmental pollution have brought attention to distributed renewable power generation such as photovoltaics and wind power. However, the integration of distributed power sources puts forward higher requirements for the safety, stability and economic operation of the power system. Traditional protection setting methods face greater difficulties in solving the contradiction between action time and protection selectivity under complex conditions including distributed power generation. In many cases, the setting value is not optimal. With the increase in the penetration rate of distributed power sources and the increasingly complex operation of distribution networks, how to achieve the optimal setting of overall protection performance has become a current research hotspot. For this reason, this paper proposes a new scheme based on the Sparrow algorithm to optimize the online protection of distributed power distribution network protection, which is verified by a calculation example.
A method for geometric tolerance annotation and position adjustment of engineering graphics
Authors: Jiang Youzhi , Liu Fuyun , Wu Qiang , Xu Yunzhan 
Published: March 2021

Abstract
In the field of engineering design, 2d engineering drawing is the core content of machining. Most drawings are datum symbol old mark phenomenon, manually modify the notation and variant design can lead to the emergence of the form tolerance of interference, using CAD software provided by the API interface, combined with the Microsoft visual studio 2012 development platform for secondary development, makes the old national standard in the engineering drawing, form and position tolerances of interference is able to automatically adjust and modify the notation, and meet the international requirements. It can not only shorten the design cycle and improve the drawing efficiency of designers in product production, but also avoid the human error in drawing and ensure the quality of drawing.
Morphology and Efficiency of the Deposition Function in the Deterministic Electrochemical Repairing Method
Authors: Li Dan , Yin Qin , Shen Xinmin , Yuan Jianhu , Zhang Xiaonan 
Published: March 2021

Abstract
Deterministic electrochemical repairing method is effective technique for the rapid fixing of damaged parts in the military equipment, and its critical content is to achieve a steady deposition function. In order to take into consideration both the repairing efficiency and fixing accuracy, three shapes of deposition functions were developed through the square nozzles, the rectangular nozzles and the round nozzles. Meanwhile, for the three kinds of nozzles, each kind had several sizes, which aimed to further improve the scope of application of the deterministic electrochemical repairing method. Furthermore, the deposition functions were detected through measuring the morphology and efficiency of the deposition spots obtained by the deterministic electrochemical repairing system with the varied deposition times of 0.5h, 1.0h, 1.5h and 2.0h, respectively. The experimental results indicated that morphology of the deposition functions were consistent with those theoretical results, and their corresponding efficiency was steady, which were propitious to obtained better repairing efficiency and higher fixing accuracy. The developed effective deposition functions can promote the practical application of deterministic electrochemical repairing method in the precision assurance of military equipment.
Automatic Control System of Hydraulic Tension Pilot Warm Rolling Mill
Authors: Yang Hong , Li Jianping , Sun Tao , Niu Wenyong 
Published: March 2021

Abstract
In order to meet the warm rolling demand and deal with the inefficiency of cold-rolled deformation metals such as high-strength steel, silicon steel and magnesium-nickel alloy, etc., The state key Laboratory of Rolling technology and Automation of Northeastern University(NEU-RAL) designed and manufactured a new pilot warm rolling mill that can achieve heating on line in the rolling process. This paper introduces equipment constitutes, and its main functions and features. The paper also describes its temperature control system, AGC system and ATC system during the warm rolling process in details. Multiple experiments have proven that the pilot warm rolling mill can not only simulate the actual production process to produce the hard-deformed metals, provide innovative technology, but also offer easy to use experimental equipment for steel industry researchers.
Simulation and optimization of a factory automation production line based on Plant Simulation
Authors: Luo Silin , Cen Songqing 
Published: March 2021

Abstract
Model an automated production line in a factory in order to understand and improve the automated production line. The layout and function of this automated production line were simulated on Plant Simulation, and the statistical results were obtained according to the actual situation. According to the results, the shortcomings of the production line were analyzed, an optimization method was proposed, and the results were simulated again by using genetic algorithm for comparison.
Industrial robot trajectory planning based on improved pso algorithm
Authors: Han Shunjie , Shan Xinchao , Fu Jinxin , Xu Weijin , Mi Hongyan 
Published: March 2021

Abstract
A particle swarm optimization (PSO) algorithm which can dynamically adjust learning factors is proposed to solve the problems of low efficiency and unstable operation of traditional industrial robots. The method uses piecewise polynomial interpolation to fit the trajectory, and uses an improved particle swarm algorithm to optimize the trajectory of industrial robots with time as a fitness function. This method effectively combines the piecewise polynomial interpolation function with PSO, avoids the complex process of particle swarm algorithm to construct the adaptation function, and improves the problem that the traditional PSO is more likely to fall into local extreme value in the early stage and convergence speed is slow in the later stage. Through experiments to obtain the motion pose, velocity and acceleration trajectory of each joint of the manipulator, we can know that this method can effectively realize the trajectory optimization of the industrial robot, and ensure the stability of the overall operation while improving the operating efficiency.
RF design studies on a 325 MHz rebuncher cavity for high intensity linear accelerators producing neutrons
Authors: Zhu X. , Marchand C. , Piquet O. 
Published: March 2021

Abstract
Two identical Coupled Cavity Linac type (CCL) rebuncher cavities to be integrated in the Medium Energy Beam Transport line (MEBT) of a high intensity linac Accelerator have been studied for matching a 40-mA proton beam accelerated by a 3 MeV Radio-Frequency Quadrupole (RFQ) to a 13 MeV Drift Tube Linac (DTL). The rebuncher operates at 325 MHz, and is designed for β = 0.080. The rebuncher aperture radius is 20 mm required by transverse beam dynamics. It is a single gap structure operating in the TM_010 mode for providing longitudinal beam focusing. The unloaded quality Q0 and the required input power to achieve an effective voltage of 150 kV are 27253 and 20.5 kW, respectively. In this work, we present the RF design studies for the high power rebuncher resonator, as well as the considerations of the tuning scheme and the coupler design.
Global synthesis for the scaling of soil microbial nitrogen to phosphorus in terrestrial ecosystems
Authors: Wang Zhiqiang , Wang Mingcheng , Yu Kailiang , Hu Huifeng , Yang Yuanhe , Ciais Philippe , Ballantyne Ashley P , Niklas Karl J , Huang Heng , Yao Buqing , Wright S Joseph 
Published: March 2021

Abstract
Nitrogen (N) and phosphorus (P) are associated with the life history of all organisms. Soil microbes play essential roles in nutrient cycling and ecosystem dynamics. As compared to plants, however, our understanding of the soil microbial N versus P scaling relationship remains limited. In this study, we used a comprehensive dataset comprising 2210 observations from 422 sites worldwide to examine microbial C, N, and P concentrations and C:N:P ratios, and to determine the scaling of microbial N versus P in different ecosystems and spatial scales (i.e. soil depths, latitudinal zones, and local sites). The global mean values of microbial C, N, and P concentrations were 721.5 mg kg−1, 84.7 mg kg−1, 37.6 mg kg−1, respectively, whereas C:N, C:P, and N:P ratios were 9.5, 30, and 3.4, respectively. Microbial C, N, and P concentrations varied within and across different ecosystems and spatial scales, but C:N:P ratios varied surprisingly little. The numerical value of the scaling exponent (i.e. the slope of the log-log linear relationship) of microbial N versus P was 0.89 across the entire dataset and for different ecosystems. However, the numerical value of the exponent varied significantly across different spatial scales. Soil total P was the largest contributor to the variation observed in the scaling of microbial N versus P at different local sites. These findings have important implications for predicting soil microbial growth rates and improving our understanding of nutrient cycling in plant-soil-microbe systems.
Research on remote monitoring technology of temperature field in goaf of fully mechanized caving face
Authors: Sun Jing , Zhang Canming 
Published: March 2021

Abstract
In this paper, the test site is the working surface hollowing area of Luling Coal Mine 8, coal seam III 811, and the distributed fiber temperature measurement is carried out. Distributed temperature measuring fibers and beam tubes are arranged in the inlet and return wind lanes of the work surface for continuous monitoring. After analyzing the data such as measuring temperature and gas concentration, the remote monitoring technology of the temperature field in the mining area is expanded. Finally, combined with the self-ignition characteristics of the Luling coal seam and the classification criteria of the “three zones” in the mining area, the range of the self-ignition hazard area of the III 811 mining area is accurately determined. This paper provides theoretical and technical support for the development of targeted fire prevention measures and remote monitoring.
Experimental Study on Spontaneous Combustion Prediction System of No.12 Coal Seam in TongXin Coal Mine
Authors: Cai Zhouquan , Shi Lin 
Published: March 2021

Abstract
To reduce coal spontaneous combustion hazards, establishing accurate and reliable prediction system, with 12# coal seam with TongXin ore as object, using the large platform of coal spontaneous combustion simulation of coal spontaneous combustion process, the oxygen consumption rate, exothermal intensity and other characteristic parameters were analyzed, and based on the method of index gases, temperature programmed experiments, summarizes the characteristics of the temperature and gas change rule. The experimental results show that the oxygen consumption rate and heat release intensity increase with the increase of coal temperature. At 70.1 °C, it reaches the critical temperature of coal; at 132.7 °C, the dry cracking temperature of coal is reached;when the temperature is 244.8 °C, it reaches the growth temperature of coal; when the coal temperature is between 22.9.1-70.1 °C, CO and C2H6/CH4 can be selected as the main index gas of No.12 coal seam in TongXin Mine; when the coal temperature is between 132.7-320.5 °C, CO can be selected as the index gas. Since C2H4 can only be detected when the coal temperature reaches about 85 °C, C2H4 and C2H4/CH4 can be used as auxiliary marker gas.
Integrated energy service business operation model and key issues research and prospects
Authors: Liu Dunnan , Liang Jiahao 
Published: March 2021

Abstract
At the present stage, China is faced with the problems of unreasonable energy consumption structure, difficult coordination of energy utilization and imbalance of energy supply and demand. Under the background of energy Internet, the commercial operation of comprehensive energy services will have a favorable impact on solving the problem of comprehensive utilization of energy in China and stabilizing the balance between energy supply and demand. This paper reviews the current research on the business operation mode of integrated energy service, summarizes the key problems in the business operation process of integrated energy service, and finally draws relevant conclusions based on the above content, and puts forward the improvement of the business operation mode of integrated energy service at the current stage.