bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of variational calculus for optimization of optic gradient coatings
Authors: Schitov N N 
Published: May 2021

Abstract
The design optimization for n-graded optic coatings based on variational calculus is discussed. In order to exemplify the approach, the Lagrange problem for minimizing refraction is stated and solved. The refraction law is generalized for alteration of the continuous refraction index. To solve problems of reflection minimization, an integro-differential equation of retarding potentials is proposed to use as a condition to the nonholonomic Lagrange problem.
Influence of Ni on electrochemical resistance of tribo-adaptive Ti-Al-Mo-N coatings
Authors: Sergevnin V S , Demirov A P , Belov D S , Chernogor A V 
Published: May 2021

Abstract
Electrochemical behavior of Ti-Al-Mo-N coatings before and after addition of Ni in amount of 1 and 2 at. % was investigated in alkaline and acidic media. Ni resulted in decrease in the corrosion current an alkaline media and reduction of oxygen concentration in the coating material after electrochemical test. It was found that addition of Ni to Ti-Al-Mo-N coatings with high molybdenum content increases the resistance to dissolution in alkaline media, but does not have a significant positive effect on their resistance in acidic environments.
Investigation of the influence of laser treatment modes on coatings of aluminum, nickel, nickel-titanium systems
Authors: Makarov A M , Gerashchenkov D A , Kuznetsov P A , Ryabov V. V. , Vasiliev O S 
Published: May 2021

Abstract
This paper shows the effect of different modes of laser treatment on the final structure of the coating obtained by the CS method. Among the studied modes, the following were selected: the speed of movement of the laser spot, defocused or focused laser beam, continuous or pulsed mode of laser treatment. The CS coatings of systems Ni, Ni-Ti, Al have been investigated. It is shown that under pulsed and defocused modes, the resulting coatings have cracks and other types of defects. It is also shown that the microhardness of CS coatings after laser treatment with a laser beam increases: 8 times for the Al system, 3 times for the Ni-Ti system, and does not increase for the Ni system.
Influence and Application of Big Data Analysis in Product Design Research
Authors: Yang Fan 
Published: May 2021

Abstract
Design research is an important work in product design. Through a series of data collection and data analysis, we can better adjust the design scheme. The traditional product design research mode data analysis effect is not good, through the Big Data(BD) technology research and analysis of product design, is a good solution at present. Therefore, this paper establishes the research on the influence and application of BD analysis in product design research. In this paper, the product design research and the application of BD analysis technology in the design research are deeply studied and analyzed. It is believed that through the BD technology, the research content can be analyzed more scientifically, so as to improve the overall product design effect. In order to make the BD analysis technology better applied in product design research, this paper optimizes and improves the evaluation crowd weight calculation method of entropy processing, which effectively improves the accuracy of the algorithm. In order to further verify the application effect of BD analysis in product design research; this paper establishes a test experiment with “mobile power supply” as the product. The experimental results show that among the tested users, young people aged 15-20 are the main ones, accounting for 38.7%. According to the analysis of users’ interests and hobbies, the highest proportion of digital options is 31.2%. The analysis shows that the results of BD analysis provide valuable reference for the formulation and adjustment of product design strategy.
Numerical Simulation of Soft Rock Creep Behavior under Coupling Influence of Temperature and Stress
Authors: Wang Hongwei 
Published: May 2021

Abstract
In order to investigate the deformation law of deep surrounding rock under the coupling influence of temperature, cracks and stress. We take the temperature, initial damage and confining pressure into consideration to simulate the deformation of deep surrounding rocks after mining. The numerical simulation of the creep characteristics of deep tunnel can be sum up as follows: a) the increase of temperature makes the strength decrease and the increase deformation of rock mass; b) With the increase of confining pressure, the anti-deformation ability of rock mass is enhanced and the failure mode of rock mass changes from brittle failure to plastic failure; c) The existence of cracks reduces the strength of rocks and intensifies the deformation of rocks; d) the stress in the tunnel mainly concentrates on the tip of the initial cracks and the existence of defects aggravates the deformation inside the tunnel.
Research on the influence of spindle temperature rise of drilling and tapping machine on machining accuracy
Authors: Yu Lianzhou , Xing Zhihui , Gao Mingming , Shang Li 
Published: May 2021

Abstract
With the progress of science and technology, the improvement of product performance, as well as the improvement of user’s requirements for product experience, the accuracy of machine tools and equipment is required to be higher and higher. Spindle is an important component of high-speed drilling and tapping machine. The change of its temperature directly affects the accuracy of machining size and appearance of machine equipment. This paper mainly studies the causes of spindle temperature rise and the methods to prevent excessive temperature rise.
Bionic fish design with coordinated propulsion of pectoral and caudal fins
Authors: Miao Fengyi , Peng Lijun , Wu Jiaxu , Shi Ting , Gao Xian , Hu Ruan , Qi Jingyuan , Gao Xinchi , Mei Jie 
Published: May 2021

Abstract
The continuous development of the aquaculture industry is accompanied by a large amount of aquaculture wastewater discharge, which brings a series of environmental protection problems. With the call for the construction of high-quality modern marine pastures, it is imperative to enhance the research and development capabilities of marine observation/monitoring equipment and pollution reduction/monitoring equipment. At present, underwater submersibles have the characteristics of complex structure and high concealment requirements. As a typical combination of robotics and bionics, the bionic robotic fish has the characteristics of high swimming efficiency, strong mobility, and strong concealment. This project will apply the bionic robotic fish to the field of pasture construction and monitoring in oceans and other waters. A bionic fish with coordinated pectoral and caudal fins.
Physical-mechanical performance of bamboo scrimbers made from Bambusa rigida
Authors: Zhang You , Li Feng , Zhang Xuelun , Qiu Chongpeng , Liang Ting , Peng Xiaopeng , Huang Xingyan 
Published: May 2021

Abstract
Bamboo scrimbers (BCs) with excellent performances were made from Bambusa rigida (2 to 5 years old). It was found that BCs made from 3-year-old bamboo have the smallest thickness swelling (TS) and width swelling (WS). BCs prepared from 4-year-old bamboo has the maximum compressive strength (CS) and horizontal shear strength (HSS). The maximum modulus of rapture (MOR) and modulus of elastic (MOE) of BCs were observed in BCs made from bamboo with age of 5 years. Overall, the resin dosage of 11% was optimized to fabricate BCs with different maturing bamboo culms; 4-year-old bamboos were recommended to be used as the raw material for the production of BCs.
Application of the precision industrial measurement technology in geometric measurement
Authors: Hu Chang’an , Li Wanze , Zhou Yang , Du Wenbo , Peng Yuanhui , Li Jiangang 
Published: May 2021

Abstract
In recent years, for expanding the productivity and improving the market competitiveness, some methods are carried out, which include new technology, new process, new materials and so on, to constantly improve the precision of geometric measurement in the manufacturing field. In addition to this, a large number of the advanced manufacturing equipment has also been used. In the case of rich field experience, this paper mainly introduces the application of laser tracker, laser interferometer, joint arm type coordinate measuring machine, three-dimensional contour optical scanning measuring instrument in robot, automobile fixture, ground penetrating radar, special-shaped parts scanning and so on.
Analysis and Practice of Jiangsu Expressway Centralized Maintenance Mode
Authors: Wang Hongxiang 
Published: May 2021

Abstract
Under the traditional maintenance mode, the contradiction between maintenance operations and traffic has negative effects on maintenance safety, efficiency, quality and benefits, and the centralized maintenance mode can effectively solve this problem. Based on the practical experience of the Jiangsu Expressway Centralized Maintenance Project, this paper summarizes the significance of carrying out the centralized maintenance of expressways, and systematically analyzes the applicability of the centralized maintenance mode from the two aspects of project requirements and external conditions. Not all expressway maintenance projects are applicable. In order to adopt the centralized maintenance mode, it is necessary to combine the construction operation content of the project and the external construction environment to make scientific decisions. Finally, taking the Shanghai-Nanjing Expressway Centralized Maintenance Project as an example, it introduces the construction organization and management characteristics of the Shanghai-Nanjing Centralized Maintenance Mode and the successful experience of the design scheme for traffic diversion of high-volume expressways, in order to provide a certain reference value for similar projects.
Application Research of Online Sensing Technology of Dynamic Capacity Increase
Authors: Chen Li Hui , Feng Yang , Yuan Fu Zhong , Ye Cui Rong 
Published: May 2021

Abstract
With the continuous development of my country’s national economy, the demand for electricity in various regions continues to increase, and the operation of high-voltage overhead transmission lines in many regions is already facing transmission bottlenecks. Therefore, it is very important to study the dynamic capacity increase technology of high-voltage overhead lines. This article points out the main technologies and methods to increase the transmission capacity of transmission lines, analyzes the advantages and disadvantages of each technical method, evaluates the advantages and limitations of dynamic capacity expansion technology and economic feasibility, and finally proposes that dynamic capacity expansion technology is developing. The existing problems and the future development trend point out the broad application prospects and important practical significance of the research on the new capacity-increasing wire of the online state-aware technology.
Research on Application of BIM+GIS Technology in Building Life Cycle
Authors: Wu Bei , Zhou Rui , Long Yu , Cai Xinyue , Li Bingnan 
Published: May 2021

Abstract
Based on a project, the application of BIM+GIS technology in the whole life cycle of the project building is studied. Selecting the image data based on the fusion of UAV tilt photography and panoramic data, a controllable data management platform is established. In the planning and design stage, the use of technology can reduce the frequency of exploration, check the project for design errors, reduce the number of rework of the project, improve work efficiency. In the construction phase, funding for large-scale projects through image data, using BIM Technology to simulate construction progress, collision check, etc. Reduce the waste of resources; in the operation and maintenance phase, through the management of the information data of the BIM model, so as to provide data support for the maintenance and other work in the later stage of the project.
Process Defects and Failure Analysis Methods of Crystal Oscillator
Authors: Liu Cong , Gao Yancai , Cai Xiuming , Zhou Wenjuan , Zou Jinlin 
Published: May 2021

Abstract
The common failure modes of crystal oscillators are vibration stop, waveform abnormality and frequency drift, there are many failure mechanisms, some of which are related to process defects, such as chip process defects, module packaging process defects and crystal process defects. In order to discover the process defects, summarize the performance, appearance, reason and failure analysis methods of its common process defects is necessary. Introduced several common process defects of current SMD crystal oscillators and corresponding analysis methods through specific case analysis.
Correlative Analysis Method and Its Application in Highway Slope Engineering
Authors: Zhu Weiwei , Tan Yangyang , Liu Chunli 
Published: May 2021

Abstract
Highway slope engineering is faced with a large number of information elements, and the complicated relationship between these information elements makes the slope stability evaluation very difficult. This paper introduces the correlative analysis method of Extenics, and puts forward the concept of “slope stability correlative chain”. Starting from matter-element M=(slope, stability, v), the slope stability correlative network is established. The case analysis shows that the correlative analysis method can help to analyze the stability of highway slope, and has great engineering application value.
Implicative Analysis Method and Its Application in Slope Engineering
Authors: Zhu Weiwei , Tan Yangyang , Liu Chunli 
Published: May 2021

Abstract
Slope design must be multi-objective design. In addition to ensuring the slope stability, it is also necessary to achieve other goals such as landscape construction and environmental protection. Slope design is full of various contradictions. Implicative analysis method is a kind of analysis methods in Extenics. The analysis of engineering case shows that using the implicative analysis method in Extenics to assist in dealing with contradictions in slope engineering design can obtain effective solutions and help technicians get rid of excessive dependence on engineering experience and design inspiration.
Research on the method of extrapolating 3D particle profile from 2D Fourier spectrum
Authors: Zheng Shanxi , Zheng Jiagen , Guo Xia , Sun Bingqi , Shi Chong 
Published: May 2021

Abstract
Based on 2D Fourier analysis, a shape extrapolation method of 3D geotechnical particles with arbitrary roughness is proposed, and the control conditions are discussed. It is realized that the two-dimensional profile is randomly constructed by Fourier description, then the three-dimensional particles are extrapolated using the profiles of multiple sections, lastly the 3D random particles can be generated which are close to the actual particle’s area, volume, roundness and other morphological characterization parameters; and particles with different accuracy can be constructed by controlling the number of sections. This method can provide help for the discrete element numerical calculation of particles.
New Method of Airport Pavement Health Inspection Based on MobileNet-SSD and Mask R-CNN
Authors: Guo Wentong , Fang Hongyuan , Wang Niannian 
Published: May 2021

Abstract
This paper presents a rapid detection and pixel size measurement method for airport pavement apparent disease and Foreign Object Debris. Firstly, MobileNet-SSD algorithm is used for object identification. Then Mask R-CNN algorithm is used to segment the target image and measure the pixel size of the target object. Finally, the detailed information of the target object is obtained. The experimental verification shows that the recognition speed of this method reaches 65 frames per second, and the pixel segmentation accuracy reaches 96 %, which can meet the requirements of airport pavement health inspection.
Research on the Influence of Unstable Incoming flow Parameters on DPF Regeneration Performance
Authors: Li Lu , Zhao Zhichao , Wang Yi , Meng Zaiqiang , Liu Qi 
Published: May 2021

Abstract
Based on the simulation software, a regeneration simulation model of diesel particulate filter (DPF) was established, and the influence of unstable incoming flow parameters on its regeneration performance was studied. The results show that when the incoming flow is in an unstable state, the maximum temperature and maximum temperature gradient are lower than the steady state regeneration, with decreased regeneration efficiency. When the incoming flow temperature is in an unsteady state, 550°C is the critical temperature. When the incoming flow temperature is lower than 550°C, the maximum temperature and the maximum temperature gradient are higher than the steady state regeneration. When the incoming flow temperature is higher than 550°C, the maximum temperature and the maximum temperature gradient has little difference, with regeneration efficiency higher than that of steady state regeneration. When the oxygen concentration of incoming flow is in an unstable state, the maximum temperature is higher than the steady state regeneration. The maximum temperature gradient is higher than the steady state regeneration when the oxygen concentration is lower than 15%, and the difference is not significant, and vice versa, with the regeneration efficiency higher than the steady state regeneration.
Heat dissipation performance of a heat pipe radiator with rectangular longitudinal fin under natural convection
Authors: Qu Pengyang , Li Wei , Dong Yu , Tao Hanzhong , Cheng Jianjie , Li Yannan 
Published: May 2021

Abstract
To solve the cooling problem of electronic equipment with small heat dissipation area under high uneven power, this paper presents a natural convection radiator with L-shaped heat pipe and rectangular longitudinal fin module. The radiator has the advantages of compact structure, flexible layout, and didn’t occupy the side space due to the structural advantages. A numerical study was carried out, and the results are in good agreement with the experimental results. The thermal performance of the rectangular longitudinal fin module is also studied, the radiation heat loss of the fins accounts for about 25% of the total heat dissipation. The temperature and velocity vector distribution near the fin was analysed to research the influence of flow characteristics on the heat transfer of the fin. Additionally, the numerical results also show that the fin heat sink has an optimal fin height, which is 14mm.
Research on the Application Status and Improvement of Modern Technology of Electronic Information Engineering
Authors: Ye Jingjing 
Published: May 2021

Abstract
The in-depth application of modern technology in modern electronic information engineering has greatly changed people’s lives and work, and its convenience is very strong. However, it can also be seen from practical applications that there are still some problems that have not been resolved. This article summarizes the application status of modern electronic information engineering technology based on previous work experience. The author discusses how to improve the modern technology of electronic information engineering from five aspects: how to create a good market order, how to optimize the development environment, how to strengthen the modern innovation level of electronic information engineering, how to train professional and technical personnel, and how to increase support.
Study on the Application Characteristics and Future Development Situation of Electronic Information Technology
Authors: Xu Hongxia 
Published: May 2021

Abstract
At present, under the macro background of intelligence and networking, electronic information technology has been widely used in many industries. The key technical advantage of electronic information technology is to automatically control the whole operating system, so as to ensure that system operators can adjust the system operation process by means of intelligent automatic system control devices, thus achieving the effect of correcting system operation and operation errors in time and saving technical cost resources in automatic system adjustment and control. When researching and exploring electronic information technology, the basic idea is to combine the practical application characteristics of electronic information technology and improve the means of developing electronic information technology at the present stage.
Prediction of sand mold cutting force and identification of cutting force coefficients
Authors: Ming-Peng Hou , Zhong-De Shan , Xiao-Li Dong , bin Ding 
Published: May 2021

Abstract
Patternless casting technology is an advanced digital forming technology. Sand mold cutting is one of the most important techniques of patternless casting technology. In the process of sand mold cutting, the cutting force is the key factor affecting the quality of sand mold machining, and is an important prerequisite for the optimization of cutting parameters and the study of cutting stability. The accuracy of the cutting force prediction model depends largely on the identification of the cutting force coefficient. In the average cutting force model, the cutting force coefficient is considered as a constant. For identification of sand mold cutting force coefficient, a series of resin sand cutting experiments have been conducted in this paper, fixing spindle speed and depth of cutting, linearly changing the feed per tooth to measure the cutting forces, the tangential and radial cutting force coefficient are calculated by linearly fitting experimental data. The analysis results show that with the change of the cutting parameters the resin sand cutting force coefficient is basically the same.
A Magnetic Potential-field Downward Continuation Method Based on Accelerated Landweber Iteration
Authors: Wang Ze , Zhang Qi , Pan Mengchun , Chen Dixiang , Liu Zhongyan , Hu Jiafei , Chen Zhuo , Ren Xintian , Zeng Zhe , Wang Zhenxiong 
Published: May 2021

Abstract
A high-precision geomagnetic database is the basis of geomagnetic matching navigation. In the construction of a geomagnetic database, it is necessary to use magnetic field extension technology to construct the vertical height relationship of geomagnetic data, in which downward continuation is mathematically ill-posed, and Landweber iterative method is a common solution. However, the convergence rate of the Landweber iterative method for the “non-smooth“ solution is very slow, resulting in low delay accuracy in dealing with local magnetic anomalies. Therefore, to solve the problem of slow convergence of the Landweber iterative method, a downward continuation method based on accelerated Landweber iteration is proposed in this paper. In the framework of the iterative method, stable upward continuation is used to connect the observation surface with the magnetic field values on the plane with the same height as upward continuation and downward continuation. Then the residual term is constructed by the vertical first-order derivative relation, and then the residual term is modified by using the low-pass filtering characteristic of the upward continuation operator to suppress the high-frequency noise in the residual term and finally update the iterative value. The simulation results of magnetic field models with different field source depths show that the improved method has faster convergence speed and higher extension accuracy when dealing with shallow local anomalies and deep regional anomalies, and under the condition of shallow source model, the continuation error of the improved algorithm is only 60% of that of Landweber iterative method. At the same time, the measured data also verify that the improved method can achieve fast and high-precision downward continuation of a magnetic field.