bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic Characteristics Analysis of Cover System
Authors: Zong Xiaorui , Yu Wenhui , Rui Guangchao , Jia Haijie , Zhang Xiang 
Published: September 2021

Abstract
Up to now, although a lot of research has been done on the control algorithm of cover motion, no systematic analysis has been carried out on the trajectory planning of cover opening yet. In order to improve the dynamic characteristics of the cover in the process of cover opening, a velocity planning algorithm based on trigonometric function is proposed in this paper, which improves the poor smoothness of the acceleration curve of the traditional S-shaped feedrate planning algorithm. The simulation model of the cover system is established to verify the effectiveness of the algorithm, and the results show that the algorithm is effective.
Research on wheel rail system based on Dissipative Structure Theory
Authors: Zhou Suxia , Jiang Hua , Liu Jingyuan 
Published: September 2021

Abstract
At present, the research on wheel-rail system is usually to analyze a problem separately, and draw a conclusion through experiments and simulations. This analysis result has certain accuracy, but it often cannot meet the requirements of optimization analysis of wheel-rail complex system. In this paper, by analyzing the characteristics of openness, away from equilibrium and fluctuation of wheel-rail system, a method of constructing element set based on information entropy is put forward. Entropy is used as a parameter to find out the inflow trend of wheel-rail system, and negative entropy flow and positive entropy flow are input to keep the system stable and orderly. The viewpoint of system engineering is put forward for the optimization of wheel-rail system.
Design and Development of the Flammability Tester
Authors: Xu Xiaoguang , Zhang Qiang , Chen Jian , Zhang Dong , Mai Baohua , Deng Shaojun 
Published: September 2021

Abstract
Among the international toy safety standards and national toy safety standards, the types of toys which need to be tested for flammability include: toys to be worn on the head, toy disguise costumes, toys intended to be entered by children, soft filled toys, and different types of toys have different flammability test methods. Based on the different test requirements, combined with PLC control technology and the working principle of high performance step-in motor, a multi-function flammability tester of toys is designed and developed. The function design, structure design and control principle of the flammability tester are discussed. It is pointed out that the use of this tester can not only solve the difficult problems in the test work of toys, but also greatly improve the quality and efficiency of toy safety test, and improve the automation level of the test work.
Multi-objective Reliability Optimization Design of Planetary Transmission Cutter Mechanism
Authors: Zhang Huipeng 
Published: September 2021

Abstract
Traditional planetary cutter mechanism design needs repeated trial and verification to determine a design scheme that meets the given conditions, and the scheme is generally not the best; The conventional single objective optimization design usually only aims at a certain requirement to achieve a certain optimal performance, neglecting the optimal comprehensive performance of the product. In order to solve the above problems, the reliability theory and optimization design technology are applied, and the compact structure, transmission efficiency, transmission stability and bearing capacity of the planetary cutter mechanism are comprehensively considered. Taking the minimum volume, maximum efficiency and maximum coincidence degree of the mechanism as the objective function, a multi-objective optimization design mathematical model different from the existing models is established by using the safety factor method and other constraints, Matlab software is used for optimization calculation. The results show that compared with the conventional design, the volume of the multi-objective optimization design is reduced by 79.97% and the coincidence degree is increased by 2.64% under the premise of almost constant transmission efficiency; Compared with the conventional single objective optimization design, although the single index is not optimal, the indexes are more balanced and the optimization effect is obvious.
Research and Design of MES System for Intelligent Production Line of Prefabricated Building Components
Authors: Zhou FuLiang , Chen YaJuan 
Published: September 2021

Abstract
Due to the national mandatory requirements for building assembly rate, more and more production enterprises have invested in prefabricated building component production. Because of the low intelligence of production line and the lack of advanced production management system, the problems of component production in terms of standard, quality, efficiency and energy consumption are gradually revealed. Based on the information management, combined with the new generation of information technology, this paper studies the technology, functional requirements and system architecture of MES system of intelligent production line, in order to promote the fine management and information management and control of PC intelligent production line.
Optimized Design of Internal Mixing Nozzle for Asphalt Oil Based on Fluent
Authors: Tai Weiheng , Ge Rongyu , Fu Xiuli , Chen Liwen 
Published: September 2021

Abstract
The design of the nozzle has an important influence on the atomization effect of asphalt oil in the road maintenance process. Fluent is used to numerically analyze the atomization process of asphalt oil in an internal mixing nozzle. The physical model of the nozzle was established, and the influence of the gas inlet pressure on the atomization cone angle and the SMD of atomized droplets was discussed. At the same time, the SMD of atomized droplets in different cross-sections downstream of the nozzle was studied. The results show that with the increase of the gas inlet pressure, the atomization cone angle of the asphalt oil gradually increases first and then decreases, and the SMD of the droplets gradually becomes smaller. As the distance between the cross-section and the nozzle outlet becomes larger, the SMD of the droplets on the cross-section first gradually becomes smaller and then remains basically unchanged. According to this rule, it provides a reference for the design of the internal mixing nozzle.
Based on the QT embedded data acquisition system design
Authors: Wan Jun , Wang HuaJun , Wang ZhenHeng , Yang Yao , Ma Yu , Huang Cong 
Published: September 2021

Abstract
The design of embedded data acquisition system based on QT is to use QT for embedded development, which can develop a data acquisition system with low cost, good effect and high practicability. This design is composed of temperature and humidity acquisition system module, camera acquisition module, buzzer alarm module, motor and fan module. The debugging and verification of the embedded system show that the data acquisition system has perfect function and stable operation. It can better meet the needs of practical application. QT based embedded data acquisition system has the advantages of high efficiency and reliability.
Design of socket with load identification and control
Authors: Xu Kai , Li Yilong , Jiang Zisong , Feng Xianyu 
Published: September 2021

Abstract
Under the background of demand-side power management, one solution to the problem of seasonal and intermittent power shortages is to involve residential users. The power supply company can sense and control the energy-consuming equipment such as air conditioners and water heaters in residential users’ homes. A socket with load identification and control functions is designed in the article. Through this socket, it is possible to sense and control the loads such as air conditioners and water heaters connected behind it. The socket adopts a combination of “sensing core” and “measurement core”, uses an algorithm based on events and Gaussian model to identify the load, uses a magnetic latching relay for control, and has protection functions such as overvoltage and overcurrent. In terms of installation method, it is fully compatible with the 86-size ordinary panel sockets used in residential houses on a large scale, and has certain application value.
An intelligently controlled tilting drum type kitchen waste in-situ processing device
Authors: Rong Lishan , Yu Feng , Huang Yaqin , Chen Ziqian , Wang Xinyue , Shi Ling , Gong Wei 
Published: September 2021

Abstract
Aiming at food waste, this project designs a set of innovative equipment based on realtime monitoring of biochemical processes, high-efficiency microbial aerobic fermentation and intelligent control of scenes to realize the resource utilization of food waste in situ. Focusing on the temperature and oxygen concentration in the fermentation process of kitchen waste, the two major parameters in the biochemical process will be monitored and intelligently controlled by the monitor on the cloud platform to solve the main problems in the process of resource utilization of kitchen waste. The indicators of parameters are not monitored in time, the production cycle of aerobic fermentation is long, and the traditional experience is mainly based on manual problems. In the later stage, it can be made into a vehicle-mounted mobile device to carry out community services.
Safety Evaluation of Hydraulic Steel Gate Based on TOPSIS Model
Authors: Shi Y.J , Shao Y.Y , Zhang Z.M , Jiang Y , Qi L 
Published: September 2021

Abstract
The paper aims to evaluate the safety of spillway’s steel gates in Xiaoling Reservoir. The weight of each evaluation index was obtained by analytic hierarchy process. Based on the detected data, TOPSIS model was used to evaluate the safety of main components for each gate. And then the comprehensive safety evaluation for spillway’s gates was carried out on this basis. The results were as follows. The coating of supporting arm was thin for gate 1. The coating of main beam and supporting arm was thin for gate 2. The coating of supporting arm was thin and the corrosion was serious for gate 3. The order of the three gates safety was gate 2 > gate 1 > gate 3. The results can reveal the safety situation of the gates and provide a reference for engineering maintenance.
Features and differences between Desay SV and Ford in the solution of C-V2X Technology
Authors: He Anxiang 
Published: September 2021

Abstract
C-V2X (means cellular vehicle to everything) is a vehicle wireless communication technology based on cellular network. In the early days of V2X, it was mainly based on DSRC. Its full name is dedicated short range communication, a dedicated short-range communication technology. C-V2X technology supports various vehicle networking applications including vehicle, vehicle road, vehicle person and vehicle network through device to device and cellular communication. C-V2X is a global standard formulated by 3GPP organization, including lte-V2X and 5g-V2X. Among them, LTE-V2X mainly carries basic traffic safety business. The standard has been formulated since 2015 and R14 version has been released in 2017; 5g-V2X, based on 5g NR technology, is mainly aimed at carrying automatic driving business, and will be released in 3GPP R16 at the end of 2019. This paper will compare the characteristics of C-V2X technology solutions of Ford and Desay SV, and explore the differences between Desay SV and Ford in C-V2X technology solutions [1].
Research on resolution of underwater acoustic imaging
Authors: Wu YangShuang , Lv ZhiYong , Fang QingPing 
Published: September 2021

Abstract
In order to study the influence of underwater material on the resolution of acoustic imaging, the Rayleigh resolution limit is proposed for the acoustic imaging system. Based on the realization form of Bessel function, the theoretical calculation formula of sound field scattered by a rigid sphere is obtained. Based on the boundary element theory, the scattering sound field of the small ball is simulated by COMSOL software, and the feasibility of the simulation is verified. Finally, the applicability of Rayleigh resolution limit in acoustic imaging system is verified by underwater simulation experiment with sonar. The research results provide theoretical support for improving the resolution of underwater acoustic imaging, and have important guiding significance for the research and development of underwater detection equipment.
Design of Monitoring System for Urban Low-Lying Water
Authors: Chen Shuaihua , Wang Xiaoping 
Published: September 2021

Abstract
The Internet of things technology is applied to establish a low-lying ponding monitoring system, which includes information acquisition system and information management system. This GPRS, 4G, Java, Internet of things and large database technology are applying to build a data acquisition hardware platform. On this basis, the basic database of road ponding and the monitoring and early warning system of road ponding in low-lying land are established. Thus, the application requirements of road ponding information query, management, monitoring, water level change analysis and water level overrun alarm based on map are realized. At the same time, the control of relevant drainage facilities has been integrated. The modern management means of road low-lying land ponding monitoring has been improved. And the management and control level of municipal road ponding has been comprehensively improved.
Research and application of small target detection method
Authors: Wang Zhenheng , Wang Huajun , Wan Jun , Ma Yu , Huang Cong , Yang Yao 
Published: September 2021

Abstract
With the advent of the big data era, more and more data are used in image detection. In order to solve the problem of small target detection in traditional image detection algorithms, this paper proposes an improved target detection algorithm based on YOLO-v5. The algorithm proposes to connect two models in series, using the former model for target pre-positioning, and the latter model for target detection. This method trains two different model parameters, tests them separately, and finally connects them for target detection. The test results show that the improved algorithm improves the ability in small target detection, and at the same time has a speed advantage.
Environmental Engineering Deformation Control of High-speed Railway Shield Tunnel Under Crossing Bridge Piles
Authors: Wu Nan 
Published: September 2021

Abstract
With the continuous acceleration of my country’s high-speed rail construction, it is inevitable to cross the existing engineering structure during the construction process. During the construction of high-speed railway, the control of the influence and deformation of the existing structure is a subject that needs to be studied in environmental engineering. Hangzhou metro line 1 is designed to cross under the Hu-Hang high-speed railway. According to the design, the shield tunnel is very close (minimum distance 5.19m) to the bridge piles of the Hu-Hang high-speed railway. Therefore, how to control the deformation of the bridge piles is a big problem in the shield tunnel excavation. Before construction, the method of the bored piles coupled with the jet grouting piles was proposed. The 3D numerical model was built to study the deformation of the bridge piles with the cases of the shield tunnel excavation without soil consolidation, the construction of the bored piles coupled with the jet grouting piles and the shield tunnel excavation with soil consolidation. The results show that the method of the bored piles coupled with the jet grouting piles can control the deformation of the bridge piles in the shield tunnel excavation effectively. Then, the deformation monitoring of the bridge piles was performed in the process of construction. The monitored data were close to the calculated results, which implies that the method of the bored piles coupled with the jet grouting piles is effective.
Research on Drilling Depth Measurement Technology based on Drilling Rig Parameter Monitoring
Authors: Gao Jun 
Published: September 2021

Abstract
In view of the problem that the drilling depth is measured by manually counting drill pipes in the process of underground drilling construction in coal mine, combined with the multi-channel sensor parameters loaded on the parameter monitoring device of mining tunnel drilling rig, a new drilling depth measurement method is proposed. This method mainly relies on multiple pressure sensors assembled on the drilling rig to reflect different drilling rig operation states, and the drilling depth is obtained by increasing or decreasing the displacement parameters of the power head. It is suitable for tunnel drilling rig equipped with drilling rig parameter monitoring device. It not only saves hardware cost, but also adds a monitoring function of the device. At the same time, it provides a new technical path for accurate and reliable drilling depth measurement.
Effect of different inlet pressures of vortex tube on internal flow field
Authors: Xu Qijun , Xie Jing 
Published: September 2021

Abstract
Numerical simulations were used to investigate the distribution of the internal pressure, velocity, and temperature fields in the vortex tube (VOTU) at inlet pressures of 1-4 MPa to reveal the causes of temperature separation. A three-dimensional model with a nozzle flow channel number of 5 was drawn, and the simulation was performed in Fluent 19.0 with CO2 as the working fluid. The simulation results show that when the inlet pressure of the VOTU is greater than 2 MPa, the temperature separation between the hot and cold air streams of the VOTU gradually increases with the increase of the inlet pressure. The maximum temperature is 285 K and the minimum temperature is 257 K at an inlet pressure of 1.0 MPa, and the maximum temperature is 319 K and the minimum temperature is 243 K at an inlet pressure of 4.0 MPa. As the inlet pressure increases, the temperature difference inside the VOTU will also increase. In the high-pressure condition, the wall thickness and sealing degree of the VOTU design should be increased accordingly, while the inner wall side of the VOTU needs to use wear-resistant materials to delay the long-term scouring of the VOTU caused by high-speed airflow. The results of the study have certain guiding significance for the design and manufacture of VOTUs.
Analysis and Selection of Shipping Route in Ocean
Authors: Jie Junwu , Miao Congjin 
Published: September 2021

Abstract
This electronic document is a “live” template. Ocean navigation is a long-distance cross ocean navigation. There are three kinds of ocean routes in common use: great circle route, rhumb line route and mixed route. The great circle route is usually used when ships are sailing in the ocean, but sometimes in the mid latitude sea area, the rhumb line route is a choice in the mid latitude sea area. Combined with the calculation of a navigation example, this paper makes some analysis on the selection of ocean routes in mid latitude sea area, illustrates the advantages and disadvantages of these three ocean routes with data, and draws a conclusion on how to choose the routes.
Analysis of Flexible Plate Motion Based on Co-Simulation of STAR-CCM + and ABAQUS
Authors: Shu Linzhao , Yang Guang , Ji Nan , Qian Zhipeng 
Published: September 2021

Abstract
By the advantages of the fluid dynamics software STAR-CCM + and the structure simulation software ABAQUS in their respective fields, this paper adopts the FEM algorithm for structural deformation, and based on the RANS equation for fluid simulation, the accuracy of the co-simulation method of Fluid-Structure Interaction(FSI) was proved by comparing the simulation results under typical conditions with the experimental results. Then the deformations of a large flexible plate with fixed bottom end at high flow rate were numerically analyzed. The co-simulation method can obtain more accurate and detailed flow field and structural deformation, and has certain application value for related theoretical research, engineering structure design and safety evaluation.
In-pixel automatic threshold calibration for the CMS Endcap Timing Layer readout chip
Authors: Sun H. , Gong D. , Edwards C. , Huang G. , Huang X. , Liu C. , Liu T. , Liu T. , Olsen J. , Sun Q. , Wu J. , Ye J. , Zhang L. , Zhang W. 
Published: September 2021

Abstract
We present the implementation and verification of an
in-pixel automatic threshold calibration circuit for the CMS Endcap
Timing Layer (ETL) in the High-Luminosity LHC upgrade. The
discriminator threshold of the ETL readout chip (ETROC) needs to be
calibrated regularly to mitigate the circuit baseline
change. Traditional methods need a lot of communication through a
slow control system hence are time-consuming. This paper describes
an in-pixel automatic scheme with improvements in operating time and
usability. In this scheme, a sample-accumulation circuit is used to
measure the average discriminator output. A binary successive
approximation and linear combination scan are applied to find the
equivalent baseline. The actual calibration procedure has been first
implemented in FPGA firmware and tested with the ETROC front-end
prototype chip (ETROC0). The calibration circuit has been
implemented with Triple Modular Redundancy (TMR) and verified with
Single Event Effects (SEEs) simulation. A complete calibration
process lasts 35 ms with a 40 MHz clock. In the worst case, the
dynamic and static power consumption are estimated to be
300 μW and 10.4 μW, respectively. The circuit design,
implemented in a 65 CMOS technology, will be integrated into ETROC2,
the next iteration of the ETROC with a 16 × 16 pixel matrix.
Care-seeking delay of imported malaria to China: implications for improving post-travel healthcare for migrant workers
Authors: Lu Guangyu , Cao Yuanyuan , Chen Qi , Zhu Guoding , Müller Olaf , Cao Jun 
Published: September 2021

Abstract

Background
Imported malaria cases continue to pose major challenges in China as well as in other countries having achieved elimination. Our study aims to identify the factors influencing the timing of care-seeking after symptom onset among migrant workers with imported malaria, in order to develop innovative interventions to improve access and provision of post-travel healthcare for returning migrants.

Methods
We analysed the timing and types of healthcare service utilization after symptom onset among patients with imported malaria between 2012 and 2019 in Jiangsu Province, China. Moreover, decision tree models were used to explore the factors influencing the care-seeking timing after symptom onset among patients with imported malaria.

Results
A total of 2255 cases of imported malaria were identified from 1 June 2012 through 31 December 2019. Patients with malaria imported into China were mainly male migrant labourers returning from sub-Saharan Africa (96.8%). A substantial number of patients with imported malaria sought healthcare &gt;3 days after symptom onset, which clearly represented delayed healthcare-seeking behaviour. According to the decision tree analysis, initial healthcare seeking from healthcare facilities at higher administrative levels, infection with Plasmodium vivax and absence of malaria infection history were significantly associated with delayed healthcare seeking in patients with imported malaria.

Conclusion
The delay in seeking of medical care among migrant workers with imported malaria should be considered and addressed by specific interventions. In addition to increasing awareness about these issues among health care professionals, improved access to healthcare facilities at higher administrative levels as well as improved diagnostic capacity of healthcare facilities at lower administrative levels should be developed. Moreover, education programs targeting populations at risk of malaria importation and delayed healthcare seeking should be improved to facilitate early healthcare seeking and service use.