bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on a Method of Log Aggregation
Authors: Lai Xinming , Wang Haitao , Zhao Jing , Zhang Fan , Zhao Chao , Wu Gang 
Published: December 2019

Abstract
This paper proposed a log aggregation method in scale container platform. This method collects container log data from cluster nodes through system management tool and container governance tool, provides the indiscriminate collection service for different platforms, aggregates log data in time based on Storm stream processing to implement real-time performance, implement high performance and high availability of container log data aggregation under scale clusters based on Kafka as the aggregation queue of log data.
A new analytical framework for the location selection of shared car site
Authors: He Yonggui , Meng Wang , He Qi 
Published: December 2019

Abstract
Reasonable and effective sharing of vehicle location plans will be of great significance for improving the overall efficiency of shared vehicles and the allocation of urban transportation infrastructure resources. This paper predicts the demand for shared cars in Hangzhou by evaluating the ownership rate of shared cars, and estimates the maximum number of people that can be served at each level. Then, using K-means clustering method, the initial clustering center is selected according to the center of gravity method, and the clustering condition is formed by using the minimum distance from each vehicle demand point to the clustering center to form a clustering cluster. The number of service groups of the cluster is added, and the cluster center iteration is performed according to whether each cluster satisfies the number of service groups until the optimal number and location of the network points are obtained. Finally, according to the number of service persons, the construction scale of 12 selected outlets will be determined, and the plan for the location selection of shared car outlets in downtown Hangzhou will be obtained. The research results show that this method can provide an effective basis for the decision-making of shared car site selection.
Design of Acoustic Doppler Current Profiler Calibration System
Authors: Xie Hui , Liu Yicheng , Zhang Mingmin 
Published: December 2019

Abstract
In order to trace and transmit the velocity value of acoustic Doppler current profiler (ADCP), an ADCP velocity measurement method based on deep water channel and unmanned ship is proposed. An unmanned ship carrying ADCP moves at a uniform speed along the planned route. High-speed camera and total station are used as the main standard for time and length measurement. The average velocity of ADCP in the measurement section is measured as a reference value for velocity. Compared with ADCP velocity indication, the error of velocity indication is calculated. Real-time kinematic positioning technology (GPS-RTK) is used to map the trajectory and yaw error of unmanned ship and verify the instantaneous velocity stability. The test results show that, under the condition of unmanned ship setting speed of 1 m/s, the error of ADCP velocity indicated by inspection is -0.029 m/s, and the extended uncertainty of this test system is evaluated as U=0.071m/s, k=2.
A Practical Method of Modelling and Simulation for Ball End Mill CNC Grinding
Authors: Pei Qichao , Li Zhuyu , Cui Xuefei , Wang Hongyang , Zhang Wei 
Published: December 2019

Abstract
The spherical cutting edge on the ball end mill directly affects its cutting performance. This paper presents a practical method for end mill rake/clearance face modelling. The rake face is a developed ruled surface to fulfill the desired normal rake angle. Revolution surface of the bottom curve on the rake face avoids the interference between the wheel with the designed rake face while grinding. An equidistance curve of the cutting edge on the sphere is deduced by the geodesic curve in order to adjust the position of the cutting edge. With this new modelling method as a platform, it is very helpful for model modification and contour error compensation. The measurement results show that the average value of contour error on spherical cutting edge of the machined sample is 0.01mm inspected by the tool measuring instrument. Its validity is verified by good agreement between the results computed and the data measured.
Applications and prospects of titanium and its alloys in seawater desalination industry
Authors: Wang C P , Wang H Z , Ruan G L , Wang S H , Xiao Y X , Jiang L D 
Published: December 2019

Abstract
Seawater desalination (SD) is an effective method to solve the shortage of human water resources. Because of the excellent corrosion resistance of metallic materials in natural waters, as well as the best corrosion resistant, low density, high strength and good heat resistance in seawater, titanium and its alloys are considered the desirable marine material, including in SD equipment. This review introduces material characteristics of titanium and its alloys, and three currently most widely used commercial SD technologies: multiple effect desalination (MED), multi-stage flash (MSF) and reverse osmosis (RO). The applications and prospect of titanium and its alloys in SD industry are overviewed and analysed. This paper can be a reference for the future material selection of SD equipment.
A comprehensive study of three dimensional deviation analysis methods for aero-engine rotors assembly
Authors: Ding Siyi , Zheng Xiaohu , Bao Jinsong , Zhang Jie 
Published: December 2019

Abstract
Rotor assembly is a core tache in the whole process of aero-engine manufacturing. The assembly deviation analysis is an effective tool to control deviation propagation. For aero-engine rotors assembly, the traditional deviation control methods focus on the modeling of plane dimension chain and extremum analysis, which is difficult to comprehensively consider the rich geometrical errors and their relationship to each other; meanwhile, the precision prediction is too conservative to reduce the parts’ rework frequency and adjusting difficulty; In addition, traditional methods overemphasize the promotion of parts’ machining precision, and ignore the means of overall stack optimization. In recent years, three dimensional deviation analysis and control methods have a lot of developments. These methods synthetically consider the matters of size deviation, form and location deviation, fixing structure and the positioning relationship. The poor concentricity problem of gyro black assembly can be exactly described, which is beneficial to control assembly deviation. This paper deals with aero-engine rotors assembly problem from two perspectives: deviation expression and deviation propagation, gives the difficulties of this topic, and provides a detailed review on the most recent approaches about partial deviation expression and three dimensional chain propagation. Finally, a perspective overview of the future research about aero-engine rotors assembly is presented, such as rotors deformation, surface morphology representation and matching, and the relationship between assembly precision geometry and performance physical quantity.
Lithium insertion in Si electrodes studied by first principles method
Authors: Wu Ruiqi , Liu Fengbin , Lina Si , Zhao Nan , Yan Hongjuan , Chen Jianguo 
Published: December 2019

Abstract
Si has been considered as one of the most potential new-generation anode materials for high-capacity lithium-ion batteries. However, the lithiation and delithiation of lithium ions during the charge-discharge processes of the Si electrode would give rise to almost four-fold volume expansion, causing structural changes and cracks of the conductive network, limiting the application of Si-based anode material. In this paper, the lithium ions inserting into Si material at various positions and at different doping concentrations of lithium ions was studied by first-principles method. The stability of different insertion sites, the structural changes, band structures and density of States after Li insertion were analyzed. It has been found that the lithium ions doping is an interstitial doping rather than a substitutional one and the tetrahedral center (Td) site is the most stable insertion position. From the band structure analysis, it can be seen that the Si material with the insertion of lithium ions becomes metal-like, and as the concentration changes, silicon changes from an indirect gap semiconductor to a direct gap semiconductor. When the concentration reaches 12.5%, the structural expansion rate increases obviously. This work provides a strategy for the improvement of the Si based anode material used in high-capacity lithium-ion batteries.
Research Progress on Production Technology and Equipment of Fired Perforated Brick
Authors: Liu Hongmei , Zhang Jian , Wang Xingxing , Zhu Aidong , Ding Dawei , Ni Hongjun , Ai Wenbo 
Published: December 2019

Abstract
Fired perforated brick is a common material in modern construction industry. This paper introduced the production technology and equipment of fired perforated brick. Based on the research status of domestic and foreign scholars, technical difficulties and corresponding solutions of production process were analyzed and summarized. And the future of fired perforated bricks production equipment was discussed.
Microstructure of silver coating of cyanide-free brush plating based on multicomponent coordination system
Authors: Li Xinmei , Zhang Zhongwen , Suo Shuai , Qiao Yaxia , Du Baoshuai , Deng Hualing , Hao Zhang , Luo Hongjian 
Published: December 2019

Abstract
By using metallographic microscope, scanning electron microscope, X ray diffraction and other test methods, this paper studies the microstructure of brush silver coating prepared by multicomponent coordination systems, such as succinimide, 5,5-dimethyl hydantoin and mono potassium phosphate. The results show that the appearance of silver coating of cyanide free brush is silver white with uniform and even surface and the combination situation between silver coating and copper is great. The coating is the single silver particle structure whose arrangement is tight and size is small and even. It meets the requirements of microstructure of button contact used by high voltage switch and lays the theoretical basis for the development of electric brush plating repair technology of silver coating of button contact used by high voltage switch.
Interfacial stress of carbon fiber patch bonded to transverse cracked steel plate reinforcement
Authors: Fan Zhao , Zhang Xiangming , Wu Jing , Wang Anwen 
Published: December 2019

Abstract
A three-dimensional elastic-plastic finite element model was established in finite element software ANSYS to investigate the interfacial stress of carbon fiber patch bonded to transverse cracked steel plate reinforcement. The patch and adhesive were modeled as linear elastic. The steel plate was modeled as elastic-plastic. The load-deflection curve of the steel was obtained by bending test. The influence of crack depth, adhesive thickness, patch thickness and patch length on reinforcing efficiency was studied. The results show that the peel stress of the adhesive was distributed symmetrically along the center line, mainly concentrated on the crack center, near the crack and the patch ends. The peel stress at the crack center was always greater than the near crack. The shear stress is anti-symmetric along the center line, and the shear stress at the crack center is zero, mainly concentrated near the crack and plate end. The debonding may be initiated from the vicinity of the crack. Increasing the crack depth can significantly increase the peel stress and shear stress at the crack, but has little effect on the stresses at the end. Increasing the thickness of the adhesive can reduce the peel stress and shear stress at the crack center and near the crack, and the shear stress at the ends, but has little effect on the peel stress at the ends. Increasing the patch thickness can reduce the stress at the crack but increase the stress at the end. Increasing the patch length cannot reduce the stress at the crack, but significantly reduce the stress at the end.
Process simulation of Multi-layer and Multi-channel Selective Laser Melt of Al2O3 Ceramics Based on Temperature Field
Authors: Chen Xiaobing , Sun Quan , Sun Quanping , Wu Haibing , Chang Zhang 
Published: December 2019

Abstract
Based on the temperature field theory and ANSYS software, the simulation model of Al2O3 ceramics selective laser melting (SLM) temperature field of multi-layer and multi-channel was established, and the analysis process of SLM temperature field simulation was designed. The temperature distribution of Al2O3 ceramics SLM temperature field and molten pool forming characteristics were researched. When the laser power is 105W, the scanning speed is 50mm/s and the thickness of powder layer is 0.25m, there is no remelting in adjacent molten channels in the same layer and multiple layers. Laser power and scanning speed are the main factors that whether remelting occurs in adjacent molten channels and multiple layers.
Design and Development of Monitoring System for GIS Structural Deformation Based on Photogrammetry
Authors: Luo Hongjian , Li Zhenggang , Gao Wenwu , Zhang Jie , Zhao Zhoufeng , Zhou Yutong 
Published: December 2019

Abstract
Aiming at the current situation, main problems and the characteristics of structure monitoring of GIS equipment, the principle and method of deformation monitoring of key points in GIS are put forward based on photogrammetry technology. A non-contact monitoring and early-warning system for structural deformation of GIS equipment is designed and developed. Moreover, the monitoring results are compared with the results of finite element simulation. The reliability of the system is verified.
Hydrothermal Synthesis and NH3 Gas Sensing Properties of Nanosheet WO3
Authors: Sun Fengyun , Mu Changsheng , Wen Dianzhong , Sun Huiming , Ju Xin , Hu Jing , Dou Yanwei 
Published: December 2019

Abstract
WO3 Nano powders had been synthesized by hydrothermal synthesis through acidification of Na2WO4·2H2O at different PH value. The phase and morphology of WO3 nano powders were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), respectively. The result showed that PH value effect the phase and morphology of WO3 nano powders. The morphology of WO3 was nanoparticles at PH=1, however became nanosheets at PH=2. The effect of PH value on the morphology of WO3 nano powders was studied. NH3 gas sensing properties of WO3 nano powders were also studied. The result showed that WO3 nanosheets enhanced NH3 sensing performance to low concentration of NH3.
Dynamic and static analysis of the battery box structure of an electric vehicle
Authors: Yang Na , Fang Rui , Li Hongliang , Xie Hui 
Published: December 2019

Abstract
As an important device to protect batteries in electric vehicles, the dynamic and static performance of the battery box is closely related to the safety of the whole vehicle. Therefore, it is very important to study the stress and displacement distribution of the battery box under specific working conditions to optimize the design of the weak parts of the battery box’s stiffness and strength. At first, this paper establishes the three-dimensional entity model and finite element model, and the stress state of battery box under extreme conditions of steep turning and braking on uneven road surface is calculated. At the last, the static strength analysis is carried out on the battery box. By analyzing the modal characteristics and the harmonious response to vibration characteristics of the battery box, the dynamic performance of the battery box has been comprehensively mastered. Finally, based on the static and dynamic analysis results of the battery box, the weak points and unreasonable points are improved. The results show that the modified model has a good improvement effect and has basically reached the established design requirements, which verifies the rationality of the structural improvement scheme.
Design and Experiment of Vibration Reduction Scheme for Sensitive Detectors Based on Random Vibration
Authors: Yue Kaiqin , Wang Feicheng , Zhang Hongjian , Li Siyuan 
Published: December 2019

Abstract
This work proposes a vibration damping scheme using a metal rubber damper for space camera mechanically sensitive detectors. The feasibility of the scheme is verified by the analysis of the principle of metal rubber damper. According to the relevant test conditions, the relevant parameters of the metal rubber damper are designed, and the vibration damping effect of the scheme is verified by experiments. The research results show that the use of metal rubber damper can play a role in the vibration energy transfer of the space camera, thus effectively reducing the RMS value of the acceleration in the main vibration direction.
The application management system of railway-river combined transportation under cloud environment
Authors: Wang Yunxi , Huang Qiang 
Published: December 2019

Abstract
In the context of the serious information isomerized of China’s hot metal water transport system, it is impossible to solve all problems of the same level in a complex cloud environment, resulting in rigid resource management problems and larger energy sources under the traditional “chimney” framework. Combining the technical framework of the iron and steel intermodal cloud platform, researching the key technologies of automated construction, deployment and cluster management of intermodal applications in the cloud environment, and building an intermodal application management system based on virtualization and elastic computing, not only can significantly reduce the heterogeneous heterogeneity of the cloud platform. The management cost of the intermodal service application can also provide a common virtual resource management service for the construction of intermodal information sharing and big data applications.
Research on Intersection Signal Timing Optimization Based on Eliminating Secondary Queuing Time
Authors: Zhai Zi-An 
Published: December 2019

Abstract
This paper takes Guanzhou Tunnel Intersection in Guangzhou Higher Education Mega Center as an example, first uses PARAMICS to simulate the traffic condition, then uses Webster method to optimize the intersection, besides, a simplified signal optimization method based on reducing the number of secondary stops is proposed. Finally, intersection evaluation indicators are compared and analyzed.
Research on time-of-use pricing method of shared bicycles
Authors: Ma Jun , Yuan Zhenzhou , Tran Thu Phuong 
Published: December 2019

Abstract
Shared bicycles have become an important mode of urban slow traffic, and the operation and management of shared bicycles have attracted more and more attention. In order to alleviate the shortage of supply during peak period and accelerate the turnover rate during flat peak period, this paper proposes a differentiated pricing strategy of shared bicycles. By establishing a bilevel programming model of shared bicycles fare and using a particle swarm optimization-based global pricing model solution algorithm, the purpose of minimizing the generalized travel cost of travelers and maximizing the economic benefits of shared bicycles enterprises are achieved. Based on the actual traffic situation in Beijing, the model parameters are calibrated to verify the validity of the model and the algorithm. The proposed model can provide a reference for the pricing strategy of shared bicycles and provide a scientific basis for the operation and management of shared bicycles enterprises.
Study on the Capacity of Urban Road Construction Section under Mixed Traffic Environment
Authors: Wang Yazhai , Zhang Weihua , Wang Kun 
Published: December 2019

Abstract
Based on the analysis of the calculation model of the capacity of urban road construction section, a calculation optimization model considering the influence of non-motor vehicle factors on the capacity of construction section is established. Through the recording and calibration of the geometric and traffic parameters of the construction section at the intersection of Huangshan Road and Susong Road in Hefei City, and using PTV-VISSIM10 for modeling and calculation, the calculation model of non-motor vehicle reduction factor is constructed. Finally, the optimization model of the capacity of the construction section is verified by combining with observation data of the morning peak of the urban road construction section under mixed traffic environment. The results show that the relative error between the calculated value of the capacity and the observed value of the construction section under mixed traffic environment is less than 5%. Therefore, it is reasonable to consider the non-motor vehicle reduction factor on the capacity calculation model of the construction section, and make up for the original model to only consider the insufficient factors such as the proportion of the large vehicle, length of work area and speed limit value.
Optimization Design of Expressway Entrance and Exit Based on Actual Traffic Flow Characteristics
Authors: Zhang Weihua , Meng Qiu , Yu Li 
Published: December 2019

Abstract
The combination area of entrance and exit is the frequent bottleneck of urban expressway system. The running state of traffic flow in combination area is closely related to the key parameters including the acceleration and deceleration lane length, the interweaving area length, the sign identification, etc. And the analysis of traffic flow status can in turn guide the design of road engineering. Therefore, this paper proposes the geometric elements optimization model and design results of the expressway entrance and exit combination area based on the actual traffic flow characteristics and driver’s driving characteristics. To verify the superiority of the optimization model, this paper takes a combination area of Jinzhai Expressway in Hefei City as an example, and after a large number of road traffic surveys, uses VISSIM to simulate and evaluate optimization effect based on proposed model and calculation results. The results show that the optimization model based on traffic flow characteristics is better at improving traffic flow status, especially during the peak period, the average delay of the research section decreased by 18.1%, and the average pass rate of the bottleneck increased by 13.6%.
Traffic safety evaluation based on fuzzy clustering analysis: case studies in the city-cluster region of Beijing-Tianjin-Hebei
Authors: Gao Tingting , Liu Xiaofeng , Zhang Rui 
Published: December 2019

Abstract
Traffic safety is a hot topic. Although traffic safety has improved, overall, for many developing countries, traffic safety fluctuates from year to year. Many studies have explored the issue of traffic safety evaluation from the perspective of the road, but little traffic safety evaluation is from the perspective of the city-cluster region. This paper adopts the fuzzy clustering theory to analyse the traffic safety level in the Beijing-Tianjin-Hebei region. Through calculation and analysis, it can be concluded that the traffic safety level in the city-cluster region of Beijing-Tianjin-Hebei differs among the three. The result shows that the overall traffic safety is improved in city-cluster of region of Beijing-Tianjin-Hebei, they are divided into two categories according to calculations. The traffic safety is relatively stable in Beijing and Hebei, but the traffic safety is more severe in Tianjin. The conclusions can provide a theoretical basis for the integrated traffic safety of Beijing-Tianjin-Hebei.