bluuebunny/crossref_metadata_2025_split huggingface dataset:
Performance evaluation of man-portable devices based on the cloud center of gravity
Authors: WeiShi Peng , Wang Wu , Chen Li , Qing Li , Ying Li 
Published: June 2021

Abstract
In order to accurately assess the performance of man-portable devices, a method of evaluating the performance of man-portable devices based on the cloud center of gravity evaluation method is proposed. Firstly, a performance evaluation index system was constructed by analyzing the factors affecting the performance of man-portable devices. Then, using the cloud center of gravity judgment method, a man-portable device performance evaluation model is established and the weighted deviation is applied to determine the evaluation results. Finally, using examples, we verify the feasibility and effectiveness of the method. The research work provides ideas and references for scientific assessment of the performance of man-portable equipment, and further provides a theoretical basis for the modification and development of this type of equipment.
Study on Internal Friction of Dislocation Density in Bake-Hardening Steel
Authors: Xiaolong Jin , Feiru Zeng , Rongsheng Sun , Rendong Liu , Yan Li , Shunda Cai , Liwei Song 
Published: June 2021

Abstract
This study investigates internal friction of dislocation density in bake-hardening steel. The experiment was conducted as follows: pre-deformation being set at 2%, 5% and 10% with the baking set at 170°C×20min. The curve of internal friction and the configuration of transmissivity were also observed. It can be concluded that with the increase of the pre-deformation value, the Snoek peak of the experimental steel decreased. Moreover, both of the SKK peak and the dislocation density grew at first and then dropped. It is noted that while the pre-deformation was set at 5%, its SKK value and the dislocation density reached their respective peak value, whereas both decreased while the pre-deformation at 2% and 10%. This study investigates the changing mechanisms of dislocation density in bake-hardening steel in relation to different degree of pre-deformation.
Research on the Motivation of Construction Enterprises Accepting BIM
Authors: Ziye Chen , Shengyue Hao 
Published: June 2021

Abstract
BIM applications are often accompanied by a series of organizational changes. The resistance of employees to changes is an important obstacle that affects BIM applications. Top manager’s function is to lead the change and promote the active participation of the employees in change, which can promote the successful implementation of BIM. And engineering construction information level will be improved accordingly. This article uses questionnaire survey method and statistical analysis method to explore the influence mechanism of construction enterprise’s senior management on employees’ active acceptance of BIM behavior, and provides useful experience for BIM implementation in construction engineering enterprises.
Study on the implementation of reinforced concrete target in PELE with hood
Authors: Jun HE , Wei-xia Wang , Zhong-hua DU 
Published: June 2021

Abstract
In order to analyze the influence of the material and shape of the hood of the medium-caliber PELE warhead on the damage effect of the reinforced concrete wall with PELE projectile, the three-dimensional nonlinear dynamic finite element program LS-DYNA was used to numerically simulate the penetration of the PELE projectile with the hood of different shapes and materials into the 0.25 thick thin reinforced concrete wall target at various velocities. The results show that under the same conditions, the hollow cone shaped phenolic resin hood can achieve better damage effect of reinforced concrete wall. Chinese map classification number: TP391.9 Document identification code: A
Study on the law of ground subsidence caused by shield construction in composite stratum
Authors: Erbin Liang , zhikang Wang , Jun Wang , Chunxin Zhao 
Published: June 2021

Abstract
In this paper, based on the actual working conditions of the shield tunnel of Jinan R3 line through the composite stratum, the engineering monitoring work was carried out. Combined with the GTS/NX finite element calculation software, the numerical simulation of shield construction in the composite stratum was carried out, and the law of ground subsidence caused by shield construction in the composite stratum was obtained, which can provide experience for similar projects, to prevent the damage caused by excessive surface subsidence above the composite strata.
Bridge anomaly data identification method based on statistical feature mixture and data augmentation through forwarding difference
Authors: Qiu Yang , Jing Liang , Li Sheng 
Published: June 2021

Abstract
Identifying abnormal data in the structural health monitoring system is of vital importance for correctly evaluating the structural service status. For the monitored data of a long-span cable-stayed bridge, this paper proposed a method to identify abnormal data, primarily including data augmentation through forwarding difference, and statistical feature hybrid. The average prediction results of the test set showed that the proposed method can significantly improve the classification accuracy of anomaly data compared to directly training the original samples. Besides, the comparison results of the confusion matrix illustrated that the prediction results based on classifiers of random forest and decision tree were more robust, and using the former as the classifier can gain better recognition performance.
Research on Deep Convolutional Neural Network in Damage Identification of Truss Structure
Authors: Gao Yiting , Yang Xiaolin 
Published: June 2021

Abstract
Aiming at the problem of damage identification inside the truss, through the convolutional neural network, after a large amount of data simulation, the deep learning convolutional neural network can effectively identify the internal damage of the truss and accurately determine the damage location as well as the damage recognition and effective prediction of other large roof trusses. First, we import the existing data into the convolutional neural network for identification, and calculate the damage identification process belonging to the truss. Then, we import another part of the data to verify the practicability and accuracy of the convolutional neural network, and obtain a series of data streams.
Research and Analysis on hydration heat effect of mass concrete for main tower cap of long-span self anchored suspension bridge
Authors: Luo Fajiang , Guo Kun , Li Peng , Wang Zhaobing , Li Jianning , Li Hualong , Dai Zizhou , Zhang Qinxiong , Luo Guolong , Liu Gang , Li Lizhong 
Published: June 2021

Abstract
The self anchored suspension bridge on Jiancai North Road in Xi’an city is a typical cable structure. According to the force transmission characteristics of the cable, the main tower bearing platform is planned to adopt the construction method of laying embedded parts in the bottom layer and pouring the upper layer at one time, which is very different from the traditional layered and phased pouring of the bearing platform. In this paper, the finite element analysis software is used to carry out the fine modeling analysis of the foundation cap and its foundation temperature diffusion area, and the actual simulation of temperature and stress is carried out, and the “temperature stress asynchronous” effect caused by the bottom layer embedded parts and the upper layer pouring construction is studied; by analyzing the asynchronous difference of stress and temperature peak, the transfer law of temperature core area and the temperature field change caused by surface temperature control effect, the construction and monitoring measurement scheme is optimized.
Study on Passenger Flow Assignment Method of Urban Rail Transit Based on Improved Logit Model
Authors: Liu Jiekang 
Published: June 2021

Abstract
With the advantages of small pollution, punctuality, safety and large capacity, urban rail transportation provides good ideas for solving China’s urban transportation problems and gradually becomes an indispensable part of China’s urban public transportation system. According to the current development of urban rail transportation, the era of networked operation has arrived, and the connectivity between different stations in the metro network and the mobility of operation and management have greatly increased. And for passengers, considering the convenience of seamless transfers, the complexity of the line network structure, and the rapid feedback of real-time passenger flow information on the line, it will cause the passengers’ travel behavior to be highly random. Different passengers are choosing the route selection scheme to reach the target station will also make the spatial and temporal distribution within the rail transit network more diverse and complicated. This paper adopts the method of analyzing the behavior of passenger travel route selection under the established urban rail transit network to establish a generalized cost function and Logit model, and contributes to the planning, design and operation management of urban rail transit.
Design and Implementation of a New Automatic Charging System for Metal Round Tubes
Authors: Yuankai Yang , Yihang Peng , Zhiqiang Liu , Yingran Xie 
Published: June 2021

Abstract
This paper took the automatic charging process of metal round tubes as the research object. A traditional manual charging method was researched and an automatic charging system was designed in this paper. The system improved the existing enterprise processing mode significantly and the overall production efficiency of metal round tubes. This article introduced the composition of the automatic charging system for metal round tubes, and further analyzed the structural design features and operation principles of each component; in order to realize the automatic production of the charging system, a complete set of automatic control system was designed in the paper, enabling the orderly connection between the round tube cutting and edge chamfering processing procedures. The automatic charging design was used to replace the original cut round tube manually transported to the chamfering process and then manually load to the chamfering slot, thereby reducing the cost of enterprise labor, improving productivity and ensuring production safety.
Research on metro safety factors assessment based on comprehensive fuzzy algorithm
Authors: Liu Fanghua , Li Jianbiao , Zhang Bo , Zhang Shuxiang , Zheng Xuanrong , Chen Qingrui , Cheng Weikang , LV Gao 
Published: June 2021

Abstract
Shield crossing loess stratum will encounter many engineering problems such as excessive local soil deformation and ground collapse crater. Based on the phenomenon and characteristics of soil deformation caused by large-diameter shield crossing loess strata, this paper summarizes the soil deformation curve, analyzes the causes of loess reaction and ground deformation, and summarizes the main causes and laws caused by shield crossing loess strata. And the fuzzy mathematical method is used to analyze the main influencing factors and provide theoretical support for the subsequent numerical simulation objectives.
Cost Analysis of Multimodal Transport on Refrigerated Container
Authors: Meng Xiangru , Sun Jianmeng , Wang Haining 
Published: June 2021

Abstract
Refrigerated container multimodal transport is a long-distance interprovincial transportation, which effectively ensures the quality of agricultural products. The application of refrigerated containers and other means of transportation in the long - distance transportation of perishable agricultural products can reduce the cost of multimodal transport of agricultural products and improve the logistics efficiency. Therefore, it is of practical significance to study the multimodal transport cost analysis of refrigerated containers for perishable agricultural products. The article classifies the applicable goods in refrigerated containers and refrigerated containers; Erishable agricultural products have short shelf life and high damage rate. Refrigerated transportation tools have the particularity; In the cold chain logistics environment, in addition to considering the transportation cost, transit cost and time penalty cost of normal temperature multimodal transport, we should also consider the loss cost of perishable agricultural products in transit and the energy loss cost of refrigerated container refrigeration in transit.
Separation of non-metallic inclusions from high strength low alloy steel by electromagnetic stirring
Authors: Li Pengchao , Liu Daiwei , Pan Zheru , Zhang Peipei , Zhang Guifang 
Published: June 2021

Abstract
Non-metallic inclusions are the impurities that solidified during steel continuous casting. The compositions, sizes and shapes of inclusions significantly affect the steels’ mechanical properties such as ductility, formability and toughness. This paper mainly focuses on the observation and characterization of non-metallic inclusions in high strength low alloy steels, and especially is devoted to the homogenization of molten steel within the copper mold of continuous casters, as the primary purpose of this project is to discover the optimum operation parameters for electro-magnetic stirrers surrounding the copper mold. In this paper, non-metallic inclusions in high strength low alloy steel were observed and characterized, and separation of non-metallic inclusions from high strength low alloy steel by electromagnetic stirring was specifically studied. The nonmetallic inclusions in the billet can be greatly reduced when the electromagnetic stirring parameters of the mold are 300 A current and 3 Hz EMS frequency.
Research on online sag monitoring of transmission lines based on barometric pressure
Authors: Gong Xing , Wang Zhiming , Xu Wenping , Li Hangfeng , Wang Ke , Guo Jian 
Published: June 2021

Abstract
Transmission line is an important part of power system, and sag is an important parameter to evaluate the running state of transmission line. Because of the complex system and the high power consumption of online monitoring application used nowdays, this paper proposes an online sag monitoring system based on high precision barometer and relative height measurement method. Firstly, precision barometer will be installed in the middle of line to calculate the relative height of measuring points. Secondly, the span of space distribution can be calculatd which leads to complete the sag calculation. All the research above has passed the test.
Automatic Testing Design for Thermal Performance of Domestic Solar Water Heating Systems Based on PLC
Authors: Haiqin Yu 
Published: June 2021

Abstract
This paper mainly introduces the method of using PLC to realize the automatic test for the thermal performance of the domestic solar water heating systems, including 4 functional modules as automatic water temperature control, automatic water supply control, automatic circulation control, and automatic data collection control. Through verification, it can meet the test requirements of the standard GB/T18708-2002 “Test Methods for Thermal Performance of Domestic Solar Water Heating Systems”.
Floc Morphological analysis of macromolecule heavy metal flocculant CSAX
Authors: Li Xizohong , Hao Xuekui 
Published: June 2021

Abstract
The purpose of the flocculation operation is not only to remove the substance causing turbidity, but also to give the causing particles with the ability to be trapped in subsequent operations. This paper discusses the process of generating the floc, sedimentation characteristics, separation effect and so on, when the macromolecule heavy metal flocculant CSAX used in water treatment, especially for heavy metal ions and turbidity of coexisting system. The research is the popularization and application of this kind of flocculant that expand the types of multifunctional flocculant, decreases the number of the water treatment unit, which provides a certain reference value.
Development Trend and Prospect of New Energy in Tibet under the Background of Carbon Neutrality
Authors: Sun Yaxun , Wang Ze , Du Yangfan , Wang Yuanhao , Wang Shifeng 
Published: June 2021

Abstract
In view of the severe situation of global warming, China puts forward the carbon emission reduction target of “achieving carbon peak by 2030 and carbon neutrality by 2060”. Among all production activities, the energy sector emits the most carbon dioxide of nearly 90%, followed by the industrial sector of more than 10%. Therefore, the focus of carbon emission reduction is to reduce carbon emissions in the energy sector. Tibet possesses unique natural conditions and geographical environment, which is rich in renewable energy and water energy resources. There is a huge space for the development of renewable and clean energy in Tibet. In order to provide sufficient energy for the Tibetan people and achieve the goal of carbon neutrality, Tibet needs to vigorously develop clean energy in the next 40 years. First of all, it is necessary to formulate a systematic energy development plan for the next 40 years, and formulate different energy development plans according to the natural conditions of different regions, so as to put the energy development plan in place. Tibet can not only achieve the goal of carbon neutrality on time, but also contribute to the power transmission from the West to the East.
Accuracy analysis of current sensor based on magnetic field
Authors: Xin Mingyong , Xu Changbao , Meng Lingwen , Zhang Li , Tian Bing , Liu Zhong 
Published: June 2021

Abstract
Current is the most important parameter in power system, and its accurate measurement is the basis of system operation. With the research of new current measurement technology based on magnetic field, such as Hall effect and giant magnetoresistance, the current can be measured without contact with the conduct. However, due to the different wire diameters and the deviation of wire position, it is impossible to measure the multi-range current through the sensor with a single structure in practical use. In this paper, the error analysis of current technology based on magnetic field is studied. First, the measurement model is analyzed, and the measured wire current and magnetic field measuring point model is established. Through simulation, the influence of wire diameter and position deviation on the measurement accuracy is tested, which supports the design of current sensor based on magnetic field.
Signal timing optimization of shifted left-turn intersections
Authors: Li Zhichao , Liu Hong 
Published: June 2021

Abstract
A signal timing optimization method based on shifted left turn lane intersections is proposed to increase the efficiency of shifted left turn lane junctions. In previous studies, vehicle delays were often the only concern but vehicle exhaust emissions were ignored, which could easily aggravate environmental pollution. A multi-objective optimization model was developed in this paper for intersection signal timing from a vehicle and environmental perspective, using vehicle delay, capacity and exhaust emissions as indicators. A modified particle swarm algorithm was used to resolve the impact of a shifted left turn lane on vehicles at a selected junction in Shanghai. The proposed scheme can reduce vehicle delay by 24.58%, increase traffic capacity by 17.09% and reduce tail gas emission by 34.68% in peak period compared with before improvement. In low peak period, the delay, exhaust emission and traffic capacity are reduced by 49.04%, 41.68% and 17.09% compared with those before improvement. Using this optimization scheme can improve vehicle delay to a certain extent, improve vehicle traffic capacity and reduce pollution caused by exhaust emission to the environment. It also verifies the validity of the model and provides some theoretical basis for setting the signal timing for shifted left-turn lane intersections.
Fast estimation method of renewable energy carrying capacity of power grid based on nadir frequency constraint
Authors: Jiang Xiaoliang , Xie Yan , Si Ruihua , Tang Xiaojun , Yu Linlin , Li Jing 
Published: June 2021

Abstract
With more and more renewable energy connected to the power system, the power system gradually presents the characteristics of low inertia and the risk of frequency instability gradually becomes prominent. Therefore, nadir frequency has become one of the limiting factors of renewable energy carrying capacity. In this paper, firstly, based on the swing equation, frequency dynamic response after power loss was analysed. Secondly, quantitative analysis on system inertia time with renewable resources was carried out, with higher penetration rate k and the replacement rate a, the inertia time is relative lower. Thirdly, fast estimation method of renewable energy carrying capacity of power grid based on nadir frequency constraint was proposed. Finally, taking a regional power grid as an example, the effectiveness of the proposed estimation method is verified.
Construction of evaluation index system of reclaimed water development and utilization potential based on AHP
Authors: Wu Leixiang , Li Ang , Guan Ronghao , Wang Zhuowei , Liu Xingchen 
Published: June 2021

Abstract
The shortage of water resources has severely restricted the rapid development of modern cities in China, and the recycling of reclaimed water is one of the important methods to effectively solve the bottleneck problem of urban water shortages. Based on the Analytic Hierarchy Process (AHP), this study determines the evaluation indexes and their weights from social and technical levels respectively and constructs an evaluation index system of reclaimed water development and utilization potential, which contains 3 levels, 5 criteria and 19 alternatives, focusing on the production, utilization and benefit of reclaimed water and other characteristic indexes. From the weighting results of the index system, among the main influencing factors of reclaimed water development and utilization, the water quantity factor has the greatest influence, the influence of water usage and water quality assurance ranks second, and the economic factor has the least influence. This evaluation system provides a useful reference for the reasonable development and utilization of regional reclaimed water in the future.
Research and Design of Automatic Chip Removal Model Based on Cutting Machine
Authors: Lu Yaping 
Published: June 2021

Abstract
Aiming at the widespread environmental pollution problem of cutting machine tools, an automatic chip removal model platform is designed based on solid works. The model platform has the functions of automatic collection of waste chips and automatic chip removal through the air guide groove. A new type of cutting seam is designed to prevent the scraps from being taken out by the cutter, and remove the scraps adhered on the cutter due to high temperature. The inner loop gas path is designed, which is composed of two air inlets and 180 degree evenly distributed air outlets, forming a unique annular gas path. The gas path relies on the annular gas path, which blows away the waste chips during the cutting work of the machine tool, and enters the inner cavity of the machine tool through the new cutting seam. The automatic chip removal model platform is based on the chip removal of the machine tool itself, which can improve the chip removal efficiency of the waste and reduce the scratches on the surface of the material.