bluuebunny/crossref_metadata_2025_split huggingface dataset:
Three-dimensional Imaging Sonar Signal Processing System Based on Blade Server
Authors: Zeng Xiangrui , Liu Jingyang , Gao Bo 
Published: June 2019

Abstract
The three-dimensional high-resolution imaging sonar uses multi-beam technology combined with synthetic aperture technology to achieve centimeter-level imaging of small underwater targets. It has a good imaging effect on underwater anchoring, sinking mine and buried mine target detection and underwater topography, and has a wide range of military and civil engineering applications. The system has a large amount of data transmission and computation, including multiple functional modules such as synthetic aperture, high resolution array processing, image processing, and target recognition. The software architecture is complex and real-time system development faces serious challenges. The blade servers have been widely used in the telecommunications, financial and other big data processing fields as for the high efficiency, stability and autonomy. This paper introduces a cluster 3D imaging signal processing system based on x240m5 blade server. The message queue communication (ZMQ) is used to realize the stable transmission of large data volume. At the same time, the mixed programming technology of C language and Matlab language combines the convenience of real-time and software integration, which greatly shortens the development cycle. The system runs stably and realizes the imaging recognition of the small spheres and their clump weights in the simulated target water.
Dynamic spectrum access strategy for cognitive wireless networks based on two channel sensing
Authors: Li Yanliang , Chen Dianjun , Zhang Luyong 
Published: June 2019

Abstract
A dynamic spectrum access strategy based on two channel sensing is proposed for the spectrum access model in multi-channel multi-user scenarios. The strategy reduces the contention of cognitive users to the channel by sensing the dynamic allocation of spectrum channels. The number of the perceptual access channels is adaptively allocated according to the number of access users, and the collision interference to the authorized channel is reduced. Then based on the above model, a hybrid dynamic spectrum access strategy is proposed, and the Overlay/Underlay hybrid access mode is adopted instead of the original single Overlay access mode. By setting the probability threshold to reduce the perception of the channel with lower credibility, the cognitive user adopts the Underlay access mode shared transmission at a lower transmission rate. The simulation results show that the proposed two dynamic spectrum access strategies can effectively reduce the collision probability and improve the network service quality.
Design and Analysis of Power Frequency Electric Field Sensing Unit with Reduce Edge Effect
Authors: Fan Liangjin , Zhang Wenbin 
Published: June 2019

Abstract
The performance of the electric field sensing unit determines the sensitivity, linearity and range of the electric field sensor. In this paper, a kind of alternating electric field sensing unit based on parallel capacitance was been introduced. And it analyzed the measurement principle of the parallel capacitive sensing unit. The structure parameters of the electric field sensing unit with equipotential ring were been designed by simulation, which reduced the influence of edge effect on the performance of the sensing unit. According to the measurement standard of power frequency electric field, the designed sensing units were tested under uniform electric field. And the influence of the sampling capacitances on the static characteristics of the sensing unit was been analyzed. The sensing unit with the best performance had a linearity of 1.6025% and a sensitivity of 248 mV/(kV/m). Its sensing unit had the characteristics of small volume, low production cost and it was easy to integrate and have mass production.
Error Tracking and Compensation Method Obtained by High-speed TV Measurement System
Authors: ShuHua Cui , Tiening Nie , Jun Liu , Haichen Lin , Yuanyuan Kang 
Published: June 2019

Abstract
Because the high-speed TV measurement instrument used to track and measure the vertical take-off section of the carrier rocket sometimes can’t provide the systematic error in the spaceflight test range, a systematic error compensation method is established succinctly and skillfully through spatial analytic geometric relationship by making full use of the rocket outline size, launch aiming direction and site parameters of each measuring station. An analysis on calculation results of actual task data shows that this error compensation method not only realizes the error correction purpose of tracking measurement instrument accurately, but also improves the flight trajectory and attitude calculation results of the carrier rocket at the same time, expanding the technology for systematic error correction method through optical measurement.
Research and Application of Low Voltage Ride Through Testing Device for Low Voltage Frequency Converter in Thermal Power Plant
Authors: Zaide Xu , Yang Liu , Jingmin Xu , Qi Xiao , Zhijie Zhu 
Published: June 2019

Abstract
In order to improve the Low Voltage Ride through (LVRT) level of the low voltage auxiliary frequency converter in the thermal power plant and effectively solve problems including the inaccurate drop time of voltage drop device, which is controlled by the switching structure of the traditional multi-winding transformer, excessive magnetizing inrush current occurs during the closing process, and the 30KW testing device for LVRT of the frequency converter in the thermal power plant is developed. It is designed with a three-phase four-wire back-to-back power electronic topology, together with adaptive fuzzy PI control algorithm. They can precisely set the voltage drop amplitude and time, ensuring automatic periodic cycle test controlled by upper computer. A LVRT field experiment has been carried out on low-voltage auxiliary frequency converter both before and after the transformation in a thermal power plant in Jiangxi Province. It proves that the dynamic response time of the power electronic voltage drop device is less than 5ms, the harmonic content in the converter voltage output is less than 0.5%. Additionally, the device boasts convenient operation and well-developed protection mechanism.
Design of Mathematical Model of Main Working Parts of Grain Combine Harvester
Authors: Wang Heng , Cao Shukun , Xu Xiangqian , Han Tao , Guo Hejia 
Published: June 2019

Abstract
In order to improve the working efficiency of the grain combine harvester, this paper decomposes the harvester into three parts: the power system, the walking system and the operating system. The paper determines the matching relationship between engine power and driving speed, corn harvesting speed, peeling speed and threshing speed. This paper determines the mathematical model of the main working parts by establishing a matching relationship. Based on the mathematical model, this paper designs the harvester simulation model by using Matlab and simulink software tools. In this paper, the effects of engine power simulation parameters on the speed, threshing and harvesting speed of the harvester in the mathematical model are studied. The results show that the harvester power increases, the walking speed of the harvester increases, the harvesting speed increases, the speed of corn peeling and threshing increases, and the loss of corn in threshing and clearing increases. The mathematical model of the harvester is very high and belongs to the large inertia system.
Humidity Sensor Based on Fiber Grating Coated with Graphene Oxide
Authors: Qiao Shuqi 
Published: June 2019

Abstract
Graphene oxide (GO) is a new two-dimensional carbon nano-material with large specific surface area and outstanding hydrophilicity. Its refractive index varies significantly with humidity, which can be used to improve the sensitivity of optical fiber humidity sensor. A kind of fiber Bragg grating (FBG) humidity sensor based on GO is proposed and experimentally demonstrated. GO is uniformly coated on the FBG surface by deposition. When the ambient humidity changes, the GO film adsorbs or releases water molecules and its refractive index changes. Thus the effective refractive index of FBG changes and the transmission wavelength also changes. The experimental results show that the sensor has a linear response of 2.53 pm/% RH in the range of 20%-70% RH, so it has the advantages of high sensitivity and simple structure.
Analysis and Simulation of Gradeability of Orchard Operation Platform Based on ADAMS
Authors: Hao Zhang , Guiju Fan , Zhao Li , Fu Qin , Xiaohan Sun 
Published: June 2019

Abstract
In view of the instability of the orchard machinery in the hilly terrain in China, this paper takes a crawler orchard operation platform as the research object. On the basis of mechanical design and theoretical analysis, the model is created by Solidworks and imported into ADAMS. It performs kinematics simulation and obtains experimental data of the machine running on a slope with a certain gradient. The simulation experiment sets the slope angle between 0° and 35°, and displays the climbing ability and working state of the orchard work platform by changing the driving force of the engine. The simulation results show that the orchard work platform designed in this paper can be used to carry out the work in the hilly area with large slope, which provides effective parameters for the improvement and actual operation of the machine.
Research on the Key Technology of the Automatic Piping Layout Design for the Launch Vehicle
Authors: Wang Teng , Nie Rongmei 
Published: June 2019

Abstract
For the low design efficiency and poor design quality in the piping layout design of the launch vehicle, the article raises a piping automatic layout method which is based on the geometry. In order to realize the piping automatic layout design, the method need the position coordinates and direction vector for both of the initial point and termination point. The article verifies the feasibility of the method by developing the piping automatic layout design system for the launch vehicle.
Dynamic Simulation Analysis of Flight Process of Bionic Aircraft
Authors: Wang Xinjie , Ning Yu , Wang Chen , Wang Caidong 
Published: June 2019

Abstract
In this paper, the beetle (Coleoptera) is taken as a bionic object. According to the characteristic of the hind wing of the beetle that can be folded, combined with the four-plate mechanism theory, a bionic flapping aircraft with four-degree-of-freedom beetle foldable wing is designed. It can realize flapping, gliding, wing folding and abduction/adduction movement with self-locking function. At the same time, the physical model of the beetle-folding four-plate wing was established. The dynamic simulation of the flight process was carried out in ADAMS. The variation of the force and torque of the flexible hinge at different flapping frequencies is analyzed. The results show that the force and torque of the hinge have nonlinear characteristics during the take-off phase, but they tend to be stable eventually. The force and torque of each hinge first decrease and then increase as the flapping frequency increases, and the time of fluctuations becomes smaller. The simulation results provide a reference for the parameter design of the flexible hinge and the control of the aircraft motion.
A Survey of Related Research on Compression and Acceleration of Deep Neural Networks
Authors: Long Xin , Ben Zongcheng , Liu Yan 
Published: June 2019

AbstractDeep networks have achieved great success in many areas in recent years. However, with the increasing sophistication of deep neural networks (DNNs), the memory consumption and computational cost expand exponentially, greatly hindering their application in mobile devices and other limited resources. Therefore, there is impending necessity to consider model compression and acceleration without affecting the inference accuracy. In this paper, we review the recent popular techniques for compressing and accelerating deep networks. Those methods could be broadly divided into four categories: parameter pruning and sharing, low rank approximation, sparse regularization constraints and network weight low-bit quantization. The advantages and disadvantages of different compression and acceleration methods are also described in detail, other types of approach are also introduced in our paper, and future prospects for the field are given finally.
Spatial Distribution Pattern and Prediction of Pension Pressure in Provinces of China
Authors: Rendao Ye , Wang Dan 
Published: June 2019

Abstract
Along with China stepping into the aging society, pension pressure has become a social livelihood issue. This paper firstly defines the concept of pension pressure standing on the employment. On this basis, the research uses the spatial autocorrelation and standard deviation ellipse to study the spatial distribution pattern and evolution characteristics of pension pressure. Furthermore, the study constructs the GM (1,1) model to predict the trend of pension pressure. Based on the data collected from 31 provinces from 1995 to 2016, it found out that the pension pressure in China shows a slow upward trend generally. The growth of the pension pressure has a spatial agglomeration effect, and the pension pressure is characterized by a general pattern of divergent spatial distribution, mainly in the East-West direction and supplemented by the North-South direction. In addition, the future distribution pattern of pension pressure in China will shift from “Northeast to Southwest” to “North to South”, and it will basically become stable in the future.
Discussion of College and University Laboratory Safety Management System Using Blockchain
Authors: Bai Yu , Chen Zhiyu , Liao Liumei , Li Liping , Liang Sheng , Wang Junyang , Chen Jun , Ouyang Bocheng 
Published: June 2019

Abstract
Laboratory safety management in colleges and universities is an important task in daily management. It is related to the life safety of teachers and students and the safety of state property, and it guarantees the normal progress of experimental projects and experimental teaching. Constructing a laboratory safety management system (LSMS) is an important way to realize the informatization and modernization of laboratory safety management. An efficient, reasonable, convenient, and open LSMS can prevent accidents, effectively supervise the disposal of wastes, and stimulate the passion of teachers and students for experiments. In this work, an LSMS based on a blockchain model is presented. By integrating safety education, equipment management, waste disposal management, and other aspects into an organic arrangement, it can be effectively implemented and provide reference for the application and implementation of blockchain technology in the field of safety management.
Influence of Welding Parameters on Weld Formation and Microstructure of Fiber Laser Beams Welded T-Joint of Aluminium Lithium Alloy
Authors: He Enguang , Chen Li , Luo Kun , Xu Fei 
Published: June 2019

Abstract
This paper focused on the welding 1.2 mm thick 2A97 aluminium lithium (Al-Li) alloy plates in T-joint form using fiber laser with ER2319 aluminium filler wire. The effects of welding parameters on the T-joint weld appearance, microstructure and the joint mechanical properties were studied systematically, and the influence of welding parameters including the incident beam position and the incident beam angle. The weld shape, microstructure, hardness of the joint were evaluated by optical microscope and micro-hardness test. A uniaxial tensile test was conducted to obtain the tensile property of welded joints. At the optimized parameters, the welded T-joints showed good weld shape without macro defect. The significant softening occurred at the weld zone of the T-joints, and the micro-hardness of the weld ranged from70 to 85 HV0.2. The tensile strength was about 432 MPa, and the fracture mode of tensile specimens of T-joints was mixed.
Research on Beam Structure Damage Identification Method Based on Time Domain Response Sensitivity Analysis
Authors: Lin Lizong , Chang Haoyuan , Zhang Xin 
Published: June 2019

Abstract
A method for damage identification of beam based on time domain response sensitivity is proposed. The damage of the beam is regarded as the reduction of Young’s modulus, and the damage of the beam structure is detected by comparing the difference in displacement response between the undamaged-beam and damaged-beam. At the same time, the derivation and establishment of sensitivity matrix and the solution of sensitivity equation were introduced in detail, and the accuracy of the method was verified by software such as ABAQUS and MATLAB. Numerical analysis shows that the sensitivity analysis method has the advantages of simple operation, less measuring points and high precision. Quantitative measurements can be achieved for single damage conditions. Meanwhile, positioning measurements can be achieved for multiple loss conditions.
Study on heat treatment process of welded plates of VW75 magnesium alloy
Authors: Li Yongjun , Lu Chunfang , Zhang Kui , Liu Xiaodao , Wang Shengqing , Teng Hang , Ma Minglong 
Published: June 2019

Abstract
In this paper, microstructure and mechanical properties of welded plates of VW75 magnesium alloy under different heat treatment conditions were studied. The results show that the eutectic microstructure along grain boundaries of weld zone all could decompose when the welded plates of VW75 magnesium alloy were heat treated at 480°C, 500°C and 520°C conditions. With increasing of solution temperature and solution time prolonging, the eutectic microstructure along grain boundaries of weld zone were dissolved more fully. When the welded plates of VW75 magnesium alloy were treated at mentioned above temperatures, the grain size of base metal all increased dramatically during the initial solution treatment. The average grain size of base metal increased from 13um to 50 ∼ 60um just for half hour. With increasing of solution temperature and solution time prolonging, the average grain size of base metal was continuously increased obviously to 80um. Compared with the process of aging treatment after solution, directly aging treatment at 220° for 10h was more benefit to maintaining the strength of the welded plates of VW75 magnesium alloy.
Fabrication and Thermoelectrical Power Factor of n-type Si85Ge15 Alloys
Authors: Xu Yadong , Ge Huichao , Dong Huiling , Dong Shufeng 
Published: June 2019

Abstract
N-type Si85Ge15 alloys heavily doped with different dopant over a wide range of dopant have been fabricated by hot isostatic pressing. Influences of the carrier concentration and mobility of heavily doped n-type Si85Ge15 alloys on the thermoelectrical power factor are investigated. The experimental results indicate that thermoelectrical power factors of 31-38μWcm −1K −2 could be consistently achieved with carrier concentrations of 2.0-3.0 × 10 cm-3 and carrier mobilities of 35-42 cm 2 V -1 s -1, However, many samples with suitable carrier concentrations do not always have high mobilities and high power factors. Some possible explanations for this behaviour are presented.
Research on the Effect of Vulcanizing Agent and Vulcanizing Process on the Properties of Sealing Gasket
Authors: Du Peng , Wang Xinning , Tuo Jianzhi , Wang Yongyan , Xie Sujiang 
Published: June 2019

Abstract
Rubber plays the role of elastic adhesive in the preparation of compressed rubber sheet gasket reinforced by non-asbestos fibre, and it has an effect on the comprehensive performance of gasket. The performance of rubber is influenced by the choice of vulcanizing agent and vulcanizing process parameters. Therefore, the tensile strength, compression-resilience, creep relaxation and leak rate of the non-asbestos gaskets are affected. By adjusting the ratio of vulcanizing agent and vulcanizing process, the properties of the gaskets were compared. The results show that the gasket developed by using the experimental results has excellent performance.
Research of heavy wall X65MOS submarine pipeline steel key process strategy
Authors: Ding W H , Li S P , Zhang H , Ma C W , Li Q , Wang X S 
Published: June 2019

Abstract
In recent years, there has been development of several significant pipeline projects for the transmission of oil and gas from deep water environments. The production of gas transmission pipelines for application demands heavy wall, high strength, good lower temperature fracture toughness, low yield ratio and good corrosion resistance. To overcome the difficulties of producing excellent performance in heavy wall X65MOS pipe Shougang Steel Research in cooperation with the Shougang Steel Qinhuangdao China (Shouqin) 4.3m heavy wide plate mill research was conducted.
This paper describes the background, composition design, key process strategy to produce excellent performance in heavy wall X65MOS plate. The importance of recrystallized rolling process, the tensile property change during pipe making and the corrosion resistance change by “pre-stretching + bend” deformation simulate pipe making in the lab will be discussed. The results showed the per pass reductions during recrystallized rough rolling should be increased in a steady fashion, with special emphasis on the reduction of the final two roughing pass prior to the intermediate hold (transfer thickness for finishing) should be more than 20%. The tensile properties change rule and the reasonable pipe expansion process should be determine during pipe making. The crack length ratio(CLR) internal control criteria of the plate should be less than 6%, it helps to ensure the HIC performance of the pipe can meet the technical specification(CLR≤15%).
Preparation and Superficial Characteristics of Light-Cured Resin Containing Negative Ion Powder
Authors: Zhu Jingli , Ding Lili , Shi Jiatong , Liu Bin 
Published: June 2019

Abstract
The objective of this paper is to prepare light-cured resin material containing negative ion powder, test and evaluate the performance of its composite material, and provide some experimental basis for its clinical application. Adopt mechanical agitation dispersion and ultrasonic dispersion for ultra-fine processing of negative ion powder. Prepare the antibacterial composite resin by evenly dispersing negative ion powder in 4% ratio of 0% to 2% in Durafill composite resin. Observe the dispersion uniformity of antimicrobial agents by scanning electron microscope (SEM), and use Fourier transform infrared spectroscopy (FTIR) to determine the curing rate of the modified composite resin after adding different proportion of negative ion powder. Test the microhardness of modified composite resin by Vickers microhardness meter. The SEM result shows that the negative ion powder was dispersed uniformly in the composite resin. The results of initial curing rate of composite resin showed that the addition of negative ion powder did not lead to the decrease of curing rate but increased the curing rate to some extent. The mechanical properties test showed that the surface hardness was decreased compared with the control group, and it was gradually decreased with the increase of the proportion of negative ion powder.
Study on Job Analysis and Optimization of Solid Wood Puzzle Operation Based on Job Measurement
Authors: Gao Weixia 
Published: June 2019

Abstract
In this paper, three types of solid wood splicing are summarized: short material splicing, narrow material splicing and thin material lamination. The technological requirements of solid wood splicing are also summarized. On this basis, the work of jigsaw splicing is measured and analyzed by means of work sampling, and some suggestions for job improvement are put forward. Finally, the existing problems in the layout of jigsaw puzzle workplaces are analyzed and improved according to the principles of importance, frequency, sequence and functionality.