bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and manufacture of lock-in amplifier
Authors: Xu Zhengqin , Zhao Wendong , Peng Laixian , Chen Juan
Published: November 2020

This design realizes the excellent performance of lock-in amplifier in detecting weak signal, which is composed of signal conditioning circuit and MCU control module. The single chip microcomputer is used to control the AD sampling of the filtered DC component after multiplication operation, and the FPGA is used to realize the phase shift control. Finally, the amplitude of the signal to be measured can be obtained by eliminating the gain generated in the whole circuit with the measured amplitude. After testing, it has the advantages of high sensitivity, high input impedance and low noise, and can realize accurate measurement.
Residual vibration control of a single-link flexible manipulator with variable stiffness and damping magnetorheological joint
Authors: Dong Xiaomin , Shi Kaiyuan , Li Wenfeng
Published: November 2020

Residual vibrations of large flexible manipulator can be easily excited due to large inertia and low damping, which greatly reduces the efficiency of the tasks. This paper describes an approach for the use of smart materials, specifically, magnetorheological fluid, in vibration control of a single-link flexible (SLF) manipulator. Considering that the systems with variable stiffness and damping have demonstrated excellent performance, a compact variable stiffness and damping magnetorheological joint (VSD-MRJ) was designed. A mathematical model of the SLF manipulator with a VSD-MRJ was established. Two independent fuzzy controllers were designed and applied to the stiffness and damping control of the joint. Finally, a test platform was built and the experimental results verified that the residual vibration suppression performance of the manipulator with the VSD-MRJ is better than the traditional rigid manipulator.
Study on the Development Process of Several Small Micro-software under the GJB5000A Three-level System
Authors: Yang Xiaoyu , Yuan Shengrui , Dang Xunyi
Published: November 2020

In order to standardize and normalize the development process of small micro-software, based on the requirements of GJB5000A three-level system, this study is based on the software engineering management technology of process improvement, so as to adapt to the actual management requirements of software.
Research on Tracking Resistance of Silicone Rubber Based on Laser-induced Breakdown Spectroscopy
Authors: Hua Ren , Heng Xu , Shanqiang Gu , Kun Chen , Chao An , Nan Liu
Published: November 2020

Silicone rubber composite materials are widely used in the external insulation equipment of power systems, and the tracking resistance grade is one of the indicators used for evaluating the performance of silicone rubber. It is of great significance to quickly detect the tracking resistance of insulator materials on site. The existing tracking resistance tests are all laboratory tests performed after sample preparation, and there is a lack of on-site detection methods. The laser-induced breakdown spectroscopy (LIBS) method was used to establish the linear relationship between the amount of ablation due to tracking and the background radiation intensity of the experimental LIBS spectrum, and the influence of silica and alumina trihydrate (ATH) fillers on the material’s tracking resistance was studied. This study showed that the LIBS technology can be used to detect the tracking resistance of silicone rubber materials.
On Condition Maintenance Model for Complex Electromechanical Equipments Based on Remaining Useful Life and Wiener Process
Authors: Wu Minghui , Wang Xuemin , Liu Xianzhong
Published: November 2020

Aiming at the problem of condition based maintenance modeling for complex electromechanical equipment, a condition based maintenance model based on residual life prediction and improved Wiener process is proposed; first of all, for the degradation process character of complex electromechanical equipment, this paper proposes a residual life prediction model based on random coefficient Wiener process; To estimate the parameters of degradation process, a prior distribution construction method based on state data is proposed; And the posterior distribution and estimation of degradation process parameters are constructed by Bayes theory, and the remaining life prediction of equipment in operation is realized. Secondly, the decision model of condition based maintenance is established by balancing the reliability and economy targets with the information of remaining life; And the immune particle swarm optimization algorithm is used to solve the model. The case study shows that the residual life prediction model proposed in this paper has higher prediction accuracy and lower prediction uncertainty, the condition based maintenance decision-making model is more practical, has higher operational reliability and economy, and the convergence accuracy of the model solving algorithm is higher.
Research on Camera Calibration Method for Visual Inspection of Excavator Working Object
Authors: Zhou Guangcun , Sun Xuan , Dong Quancheng , Cao Shukun , Li Mingchun
Published: November 2020

In order to realize the identification and positioning of the working object when the excavator works independently, it is necessary to calibrate the binocular camera to determine that the binocular is the internal and external parameters of the camera. This paper focuses on the calibration of binocular camera, and determines the transformation relationship among world coordinate system, camera coordinate system and image coordinate system based on binocular stereo vision ranging principle. The checkerboard images that meet the calibration requirements are selected by using the visual toolbox of MATLAB. The camera calibration process is carried out to determine the camera parameters to be determined. The calibration parameters are analyzed and compared to preliminarily verify the accuracy of the calibration parameters. Finally, the error source is analyzed in QT5.14.2 programming environment combined with OpenCV3.4.10, the calibration method meets the application requirements.
Design and implementation of graphical interface of vehicle display and control system based on SylixOS
Authors: Zhang Jianwei , Yang Xiaoyu , Dong Xueyi , Tian Xingke
Published: November 2020

To satisfy the design requirements of the current vehicle display and control system, and in consideration of the independent controllable requirements of the current software and hardware platforms, this paper proposed a set of nationalized solution. The Loongson 2K1000 was selected as the main control chip, and the interface design and development of vehicle display control system was completed based on the SylixOS autonomous real-time operating system. This paper elaborated on the development process of the open source graphics library Qt, and proposed solutions to the screen flicker problem encountered during the development process.
Coupling characteristics of a new automatic artillery power system
Authors: Hao Li , Runji Jian , Xintai Geng
Published: November 2020

A new automatic artillery adopted hydraulic system as auxiliary power to solve the problem of insufficient power after unified power. Firstly, the structure and working principle of the automatic artillery were analyzed. Secondly, in order to confirm the working torque of auxiliary power, the dynamic simulation model of the new automatic artillery was established. The accuracy of the simulation model was verified by test. The effect of output torque of auxiliary power system on the firing rate and roller bearing was researched, based on the simulation model. Finally, the working characteristics of the auxiliary power system were analyzed, and the design of the auxiliary power system was carried out.
Modeling and control of multi-airfoils system of exploration robot
Authors: Nan Zhao , Ya-ping Tian , Xiang Wu
Published: November 2020

Most polar exploration robots use batteries or fuel engines to provide power, which greatly limits the robot’s range of motion, and may cause pollution problems, affecting the fragile external environment of Antarctica. In view of this situation, the detection robot studied in this paper adopts three sail system driven by wind directly. Firstly, referring to the wing structure, the lift and drag forces generated by the multi wing sail system are analyzed, and the coupling relationship among the thrust, roll force and lift resistance of the robot is obtained, and the lift drag coefficient function is fitted. The system dynamics of the robot in static, linear and steering motion is analyzed respectively, and the system dynamics model of the robot in different motion states is established. Then the control system of the robot is designed and manufactured. Finally, the experiment of anti sideslip ability, anti overturning ability and starting wind speed of the probe robot prototype is carried out, and the experimental data are analyzed to prove the correctness and rationality of the theoretical analysis.
Effect of high temperature ECAP process on microstructure and mechanical properties of Ti-5553 alloy
Authors: Wang Jian , Li Zhenhua , Ma Caiyun
Published: November 2020

Excellent mechanical properties are the key to improve the erosion resistance of materials. Superplastic deformation process ECAP is a new heat treatment method which can refine grain size, improve the microstructure of materials and the comprehensive mechanical properties of materials. In this paper, the microstructure of Ti-5553 alloy treated by ECAP process and Ti-5553 alloy without ECAP process were observed, and the effect of high temperature ECAP process on the microstructure of Ti-5553 alloy was discussed. The effect of high temperature ECAP process on the mechanical properties of Ti-5553 alloy was studied by tensile test, and the effect of high temperature ECAP process on refining microstructure and improving mechanical properties of Ti-5553 alloy was discussed mechanism.
The optimal allocation of dispatchable resources considering the flexibility of microgrid
Authors: Wang Jinfeng , Zhu Fangyuan
Published: November 2020

In order to improve the ability of the microgrid to deal with uncertain interference and flexibly adapt to the frequent variability and strong uncertainty of renewable energy that is connected in high proportion, a method increasing the flexibility of the microgrid is proposed through the capacity configuration of power units of multiple types as well as the participation and response of demand side. From the point of view of supply and demand balance, the flexibility of microgrid is analyzed quantitatively. The particle swarm optimization algorithm is used to optimize the capacity configuration of the system, and the optimal dispatching model with the lowest operating cost and the maximum flexibility margin of the system is established with the capacity of multiple types of units and load response capacity as decision variables. The example analysis shows that this method can greatly improve the overall flexibility of the microgrid while ensuring that the system investment and operating costs are relatively small.
The effect of ultrasonic vibration on the springback of incremental sheet forming
Authors: Wang Rongtao , Cheng Wei , Sun Yujing , Ge Hailong , Xu Wenqiu , Wang Jun
Published: November 2020

In this study, aiming at the springback problem, ultrasonic vibration was applied to incremental sheet forming to assist the sheet forming. The springback distribution of ultrasonic vibration and no ultrasonic vibration was compared. The influence of the application of ultrasonic vibration on the springback of the sheet mental formed was analyzed; and also by adjusting the power of the ultrasonic generator to adjust the amplitude of the ultrasonic vibration, the effect of the ultrasonic amplitude on the springback is studied. Experimental data shows that the effect of ultrasonic vibration on each forming stage is different during the forming process. Therefore, it is necessary to select the best amplitude to assist the sheet forming process to achieve the effect of restraining springback.
Comprehensive Compensation Strategy on the Power Quality of Micro-grid Integration Based on the Multifunctional Energy Storage Converter
Authors: Yu Guokang , Yu Jing , Guan Honghao , Ren Juan , Wang Genggeng , Meng Gaojun
Published: November 2020

In order to improve the utilization rate of the energy storage system as well as the power quality of micro-grid and grid under parallel operations, this paper proposed an integrated compensation strategy of power quality based on the composite controlling principle of frequency division and hysteresis loops. On the premise of not changing the operation state of the power conversion system (PCS), combined with the current generation principle of multi-objective compensation, use the residual capacity of PCS to compensate harmonic, reactive and unbalanced currents quickly, accurately and selectively, so as to realize the current control on the compensation component of the grid-connected current under the disturbance of the distorted voltage. At the same time, aiming at the dwarf-signal dynamic models of the converter, use the designed output current control loop based on H
∞ resonance control theories to provide the tuning basis of the controller parameters, and thus the anti-disturbance ability of the system is improved, and the sudden change of the frequency is reduced. Finally, construct a micro-grid system with energy storage devices, and carry out experiments on the proposed control strategies. The results show that it has well governance abilities on the power quality.
Simulation of a single-phase arc grounding fault on a 220-kV cable transmission system
Authors: Gong Qiming , Liu Surong , Zheng Jiankang , Su Xiaoting , Li Shaobin
Published: November 2020

Cable tunnel fires are mainly caused by single-phase arc grounding faults. The massive energy generated by arc can threaten the safety of the densely laid cable tunnels. In this study, a digital arc fault model with a 220-kV cable transmission system was established on Power Systems Computer Aided Design(PSCAD). The arc model was improved because the parameters were acquired from the experimental results. The arc fault can be divided into two stages: a primary arc at the initiation of the fault and a secondary arc after the tripping of the circuit breakers. The primary arc contains few nonlinear components because of the large arc currents. The secondary arc voltages exhibit nonlinear characteristics because of arc elongation. The secondary arc power continues to increase, however, its amplitude is considerably smaller than the primary arc. The lifetime of the primary arc is dependent on the action of the relaying protection system. Further, some limits based on the energy balance theory were introduced to obtain the extinction time of the secondary arc. In addition, the total energy generated by the arc fault in the 220-kV cable transmission system will eventually become 4891 kJ. This digital arc fault model will significantly contribute to future research with respect to the mechanism of cable tunnel fires.
Research on Temperature Control Technology of Thermal Protection Device for The Low Temperature Wind Tunne Equipment
Authors: ZeYuan Liu , Qiang Luo , ZheYang Ge , Jing Wang , QingHua Gao
Published: November 2020

One of the important technologies to improve the Reynolds number is to reduce the temperature of the air flow inside the wind tunnel. The air flow working temperature can reach 77K at least. At this time, it is necessary to carry out thermal protection for the internal equipment of the wind tunnel. In view of the complex layout and various characteristics of the equipment in the wind tunnel, this paper takes the thermal protection and temperature control strategy of the equipment in the wind tunnel as the research object, and designs the temperature control strategy of the typical equipment from the perspectives of heating element selection, temperature control logic, temperature control algorithm and heating mode. A physical test platform was designed and built. The feasibility of temperature control strategy was verified by the physical test platform under two typical temperature conditions of normal temperature and low temperature. The test results show that the comprehensive design of the temperature control strategy can meet the temperature control requirements of different shapes, heat capacities and heat leakage conditions, and the temperature control accuracy is better than 1 °C, which can meet the design requirements and effectively ensure the normal operation of the equipment in the wind tunnel.
Research on transformer drying technology based on low-frequency heating principle
Authors: Liu Qiang , Lv Liang , Zuo HaoMing , Wang Sen , Mao Chen , Zhang Yuanjie
Published: November 2020

In the process of current transformer field insulation treatment, temperature becomes the key factor to limit the treatment effect, leading to the low heating efficiency and poor effect when installing new transformers in winter. Restricted by the power of hot oil circulating heating method in the current field operation, it is difficult to improve the actual heating effect simply by increasing the power of oil filter. Based on the principle of low-frequency short circuit heating of transformer winding, a low-frequency heating device of high-power transformer winding is developed, which can be used for the insulation heating and drying treatment of large power transformers. With the method of inputting 0.2∼1Hz ac power supply on the high voltage side of the transformer and short-circuit on the low voltage side, the inductive reactance of the transformer winding is reduced, the working voltage in the short-circuit heating process is reduced, and the required power capacity is reduced, so that the device is simple, small in size and light in weight. It is proved by many field heating tests that the drying method can achieve the desired effect and greatly shorten the working cycle.
Design of transmitting and receiving circuit of ultrasonic transducer based on STM32
Authors: Kong Xiaohe , Li Xisheng , Zhou Ruochen
Published: November 2020

In order to meet the needs of ultrasonic in industrial detection, an ultrasonic transmitter and receiver circuit based on STM32 is designed. The transmitting circuit is controlled by the optocoupler control isolation circuit and the MOSFET drive circuit to generate high-voltage excitation pulses to drive the ultrasonic transducer; the receiving circuit which achieves Processing of ultrasonic echo signals includes a limiter circuit, a preamplifier circuit, a Butterworth band-pass filter circuit and an automatic gain circuit, etc The actual test shows that the ultrasonic excitation signal generated by the system has the characteristics of low noise and steep waveform. The processed echo signal is clear, the system performance is good and the structure is simple, stable and reliable.
Development of a three-dimensional virtual monitoring system for a workshop
Authors: Li Jiang , Gao Kunshan , Yu Cungui , Zhou Cheng
Published: November 2020

Aiming at the problems of poor applicability and development efficiency of the current manufacturing workshop monitoring system, a workshop monitoring system using the industrial Internet of Things platform as the system service platform is proposed. This article takes a seal automated production line as an example to illustrate the development process of a workshop monitoring system, including virtual scene construction, data acquisition and real-time model driving based on the industrial Internet of Things platform. The results show that the 3D virtual monitoring system has good real-time performance and realizes multi-level and visual monitoring. It has certain reference value for the development of the workshop 3D virtual monitoring system.
Fast screening of capacity and internal resistance for cascade utilization of the retired power lithium-ion batteries
Authors: Liu Weiwei , Li Honglei , Deng Yelin , Yang Fan , Cong Liang
Published: November 2020

The residual capacity and internal resistance of lithium-ion batteries are important indicators for evaluating the retired batteries, and they are also prerequisites for the cascade utilization of retired batteries. Screening of capacity and internal resistance of retired batteries was studied in this paper. In terms of battery residual capacity, the battery charging system is used to obtain the battery charging curves from which IC characteristics are extracted and screened. The relationship between the IC characteristics and the battery capacity is obtained using a neural network algorithm to achieve capacity estimation. In terms of internal resistance, the charge and discharge strategies of batteries connected in series was first studied, and then a screening method for battery internal resistance was designed based on such charge and discharge strategies. The overall results of this paper provided the basis for the selection of retired power batteries.
Numerical Simulation and Design of a Lunar Sample Unsealing and Processing Equipment
Authors: Jin Wang , Zhenlin Wang , Chunjie Yan , Xuesong Wang , Chunyong Wang
Published: November 2020

Lunar Sample Unsealing and Processing Equipment (LSUPE) is an equipment which is used to vacuum unseal the Vacuum Lunar Sample Container (VLSC) and to take pictures, weigh and process lunar samples. LSUPE is mainly composed of four parts, the transfer chamber, operate chamber, unseal chamber and gas purification system. The operate chamber needs to maintain a high-purity nitrogen environment all the times to prevent samples from being polluted by the atmosphere which affects subsequent analysis of the samples. The unseal chamber switches vacuum environment to high-purity nitrogen environment. The high-purity nitrogen environment ensures that the sample is not contaminated after unsealing, and the vacuum environment ensures that the VLSC can be unsealed. In order to ensure that the water and oxygen concentration indexes in the two chambers meet the requirements at all times after the lunar sample is unsealed, this paper gives the LSUPE simulation design process, and establishes a simulation calculation model for the water and oxygen concentration. The calculation results show that the internal water and oxygen concentrations of LSUPE are better than 10ppm in any state, which meets the requirements for storage and processing lunar samples.
Research on Vibration Signal Analysis Method of Transformer Winding Based on Wavelet Packet Transform and LMD Algorithm
Authors: Zhi Yongming , Xia Yongli , Yu Yang , Chen Qian , Zhu Le
Published: November 2020

Power transformer is an important equipment in power system, and its operation status has an important impact on the safe and stable operation of power system. However, most of the existing methods are off-line detection, which can not meet the requirements of engineering practice. Therefore, how to monitor and analyze the operation status of transformer based on the on-line measured vibration signal has become a research hotspot in this field. Therefore, this paper introduces a wavelet packet transform and local mean decomposition (LMD) decomposition method based on EMD. In this method, wavelet packet transform is used to denoise the vibration signal of transformer winding, and then it is adaptively decomposed into a series of product function (PF) components by LMD, so as to reveal the signal characteristics and realize on-line monitoring and analysis of transformer winding. Finally, the feasibility and effectiveness of the analysis method in this paper is verified by combining theory with simulation.
Comparative study on image processing algorithms in laser cladding process
Authors: Liu Shuntian
Published: November 2020

Three image processing methods including threshold processing, morphology processing and smoothing processing were introduced, and three image processing methods were analyzed in combination with cases. In order to adopt the appropriate image processing algorithm to the molten pool image processing. Among them, image threshold segmentation can turn gray image binary into black and white image, morphological processing can extract meaningful image components from the image to express and depict the shape of the region, and smoothing processing can be used to reduce the noise or distortion on the image.
An improved sine cosine algorithm with multiple updating ways for individuals
Authors: Gao Zheng-Ming , Zhao Juan , Li Xu-Ruo , Hu Yu-Rong
Published: November 2020

The sine cosine (SC) algorithm was very popular for scientists and engineers since it was raised in 2016, it was an efficient, simple algorithm that could be applied in real problems. In this paper, an improved version of the SC algorithm with multiple updating ways for individuals in swarms during iterations was proposed. Inspired by the slime mould (SM) algorithm, the algorithm was re-constructed and consequently, the individuals would update their positions in three ways, parts of them would be reinitialized, parts of them following the same traditional ways, and parts of them would explore further according to their own historical trajectories. Simulation experiments were carried out and the averaged results proved that the improved version would perform better, faster, and steadier than the original one.
The artistic style transfer from Shanghai modern landmark buildings images to Xiao Jiaochang New Year pictures based on deep learning
Authors: Chen Hongyi , Luo Yeyun
Published: November 2020

Posting New Year pictures is a folk custom with a long history in China. Shanghai New Year pictures are loved by the people with its unique Shanghai style. As a representative of Shanghai New Year pictures, Xiao Jiaochang New Year pictures have left a strong mark in the history of Shanghai style culture and history through its diverse and comprehensive categories and rich artistic styles. However, due to its short well-developed period, the New Year pictures in Xiao Jiaochang have no inheritance and cannot apply for intangible cultural heritage. Nowadays, it is not realistic for us to use the traditional way to make New Year pictures in small schools because of the lack of inheritors and the production techniques have not been continued. Therefore, this paper mainly focuses on tracing back to this period of history, and realize the recording and dissemination of the style of the New Year pictures of Xiao Jiaochang through modern high-tech. Collect the relatively complete New Year pictures of Xiao Jiaochang in the world as a data set, and realize the style transfer to modern Shanghai’s landmark buildings’ pictures through the method of machine learning. Realizing the electronic work on spreading the culture in addition to the normal electronic record needs to be in time, so that Xiao Jiaochang New Year pictures can reappear in the world.
Few-shot Thangka image classification based on improved DenseNet
Authors: He Guoyuan , Xue Panpan , Meng Jiahao
Published: November 2020

Thangka is an important part of Tibetan culture, and the classification of Thangka image is one of the basic works of Thangka research. DenseNet(Densely connected convolutional networks) has achieved a very good effect in the field of image classification. Considering that the DenseNet adopts ReLU function which loses the negative feature of the image in the feature propagation process, this paper proposed an improved DenseNet, called L-DenseNet that Leaky ReLU replaces ReLU function to increase the negative feature of propagation. In order to solve the problem of insufficient Thangka image sample, we adopted the method of based fine-tuned network. Experimental results show that L-DenseNet obtains an outstanding performance, which improves 1.1% performance compared with DenseNet. Compared with other CNNs, such as VGG16, ResNet50 and InceptionV3, L-DenseNet obtains state-of-the-art performance in the classification of Thangka image.
Mask wearing detection based on YOLOv3
Authors: Ren Xiaokang , Liu Xingxing
Published: November 2020

The CoVID-19 is still raging around the world, and the work of relying on manpower to detect masks in public places is time-consuming and laborious. To solve this problem, this paper proposes an improved Face_mask Net detection method for convolutional neural network based on YOLOv3. First, a new convolutional neural network Face_mask Net is designed based on YOLOv3 network structure. Second, before training, Face_mask Net uses the K-Means algorithm to cluster the labeled dataset and change its anchor value. Finally, the Face_mask Net loss function uses DIoU and the classifier uses DIoU-NMS. The combination of the two can further improve the detection accuracy of the target. To verify the effectiveness of the proposed algorithm, the Face_mask Dataset for mask detection was collected and annotated in this paper. The experimental results show that Face_mask Net can effectively detect the target of wearing mask and not wearing mask, and its performance can be close to real-time and the accuracy is higher than that of the network before the improvement.
Research of chromatic spectral peak location on confocal point sensors
Authors: Yanlei Li , Qingzeng Ma , guo Nan , Leiguang Nan , Wei Cheng
Published: November 2020

Chromatic confocal point sensors are used to measure the high-precision surface distance, and it’s based on the theory of chromatic dispersion and encodes the distance between the measure surface and chromatic lens. By accurately measuring the wavelength value, it indirectly calculates the distance to object surface. The accuracy of the sensor depends on the chromatic range of the lens and the resolution of the spectrograph. In this paper, the algorithm of spectral peak positioning can effectively filter kinds of noise, such as spectrometer and light source. The spectral data signal peak is extracted by Gaussian fitting method. In practice, the wavelength position can be stably detected effectively.
Design and Implementation of Network Information Service Platform Based on Microservice Architecture
Authors: Lian Jin , Gao Ming
Published: November 2020

In this paper, based on the development of network information microservice platform, and according to the business characteristics of the platform, the overall architecture model of the microservice platform was designed. Besides, the system is hierarchically managed by basic equipment area, standard area, hub area, and application service area. Hence, the problems of independent deployment, data transmission sharing, service monitoring, and authority management of the microservice system are solved. Moreover, the system development process, the development efficiency, and the system reliability are also improved. The project which is supplemented by a sound management mechanism implements the framework of service platform based on Spring Cloud technology, establishes the business container of microservice, analyzes the value of the system, and then forms a sustainable optimization system.
An improved grey wolf optimization algorithm with multiple tunnels for updating
Authors: Zhao Juan , Gao Zheng-Ming
Published: November 2020

The grey wolf optimization (GWO) algorithm was proposed in 2014 and after several years of applications, it was used worldwide and all over the subjects which involved computation. Various improvements have been raised to increase the capability of optimization. Based on the best performance of the slimd mould (SM) algorithm in optimization, a hybridization of the SM and GWO algorithms was proposed about the updating equations, and the GWO algorithm with multiple tunnels for individuals to update their positions during iterations was revised. Simulation experiments were carried out and comparisons were made between the GWO algorithm with variable weights and our proposed new one. Better performance were confirmed and reported as conclusions.
Research on Target Tracking Algorithm Based on context Multi-feature Fusion
Authors: Zhao Yurong , Ling Yao , Xia Peng , Xu Qianqian
Published: November 2020

In traditional target tracking algorithms, cosine window is often used to suppress the boundary effect and expand the search range when the target is located, which will reduce the available background information. Besides, when a single feature is used, the representation of the target appearance is not strong. When the challenge factors such as background clutter and occlusion occur to the target, the target will drift, which will reduce the accuracy of target tracking and even lead to tracking failure. To solve this problem, this paper proposes a context-based target tracking algorithm that fuses multiple features, using directional gradient histogram features and color name features as input features. To solve the occlusion problem, the occlusion mechanism of average peak correlation energy and maximum response fraction value is designed to judge the updating of the model. When both values are higher than a certain historical mean, the model is updated; Otherwise, stop updating. Finally, experiments show that the tracking algorithm proposed in this paper is more robust than some traditional correlation filtering algorithms.
Three-dimensional force simulation prediction of flexible sensor based on BP neural network
Authors: Wang Feilu , Chen Yufeng , Song Yang , Hu Yong , Ye Rungen , Jiang Yanan
Published: November 2020

When the robot grabs the object, the force information detection of the object is the basis for the smooth grabbing process. The force information of the object can be fully reflected by detecting the force in the three-dimensional direction. In this paper, with polydimethylsiloxane (PDMS) as the substrate and embedded into the sensitive unit prepared by conductive rubber, a new flexible sensor which can detect three-dimensional force is designed. Firstly, based on the piezoresistive effect of conductive rubber, COMSOL Multiphysics software was used to carry out multi-physical field simulation experiment for the sensor. Furthermore, based on the nonlinear approximation ability of BP neural network and the resistance of simulation output, the training sample set and the test sample set were constructed by using the 5-fold cross validation method, and the BP neural network model was constructed to achieve the accurate prediction of three-dimensional force. Finally, the number of hidden layer neurons was adjusted to optimize the BP network model. The results of cross-validation experiments show that the sensor designed in this paper can effectively detect the three-dimensional force information, and the optimized BP neural network can significantly improve the accuracy of the three-dimensional force prediction.
A Computationally Efficient Single-Channel EEG Sleep Stage Scoring Approach using Simple Structured CNN
Authors: Li Hongzhe
Published: November 2020

Automatic sleep stage classification has been a hot trend since hand-crafted feature engineering is highly inefficient. However, current studies of automatic sleep stage scoring focus more on designing complex neural network structures to improve the model performance while neglecting the model efficiency. This causes both lengthy training time and highly demanding hardware are needed for model training, which is not favorable for future industrial applications. This work proves the concept that the simple model, such as a shallow Convolutional Neural Network (CNN) combining the proper data processing techniques, can achieve a comparable model performance (overall accuracy of 79.0 %) to the complex model (overall accuracy of 74.9-82.0 %). The designed model in this work also significantly improves the model efficiency by reducing the number of learnable parameters in the neural network. This approach provides a new insight into automatic sleep stage scoring study as well as other deep learning studies that the data processing and the model design are equally important.
Design and Application of Micro-lecture in Personalized Teaching of Computer Network
Authors: Tianjiao Liu
Published: November 2020

With the continuous development of social economy, more and more people begin to pay attention to the teaching methods of micro-lecture. In recent years, micro-lecture has been widely used in education. The advantage of micro-lecture is that it breaks through the limitations of traditional teaching mode in time and space. As a currently efficient teaching method, micro-lecture can make abstract knowledge straight forward and concrete, and it give students’ initiative a full play to improve students’ ability of learning on their own. Therefore, it better realizes the cultivation of students’ core literacy. Therefore, the personalized classroom in the age of computer network needs to design micro-lecture reasonably to play the role of micro-lecture and improve the effectiveness of teaching. Nowadays, many school leaders and teachers have begun to adopt teaching methods of micro-lecture. Apart from the high teaching efficiency of micro-lecture, the teaching mode of micro-lecture also meets the requirements of the new curriculum reform to improve teachers’ professional quality. This paper mainly studies the design of micro-lecture and its application in personalized teaching of computer networks.
Comparison of Holland’s Model and Near-Real-Time Predicting System
Authors: Zhuang Demi
Published: November 2020

Hurricanes have affected many tropical and coastal countries for years, but the history of hurricane simulation is short, due to the unpredictable nature of hurricanes. Although several models and methods developed by numerous scientists in the past have substantially enhanced people’s understanding of hurricanes’ formations and features, not all of the errors have been eliminated. To display the improvements of hurricane simulation in the past decades, in this paper, both the advantages and limitations of Holland’s wind model and a new near-real-time prediction model are compared by presenting their key calculations and main ideas, respectively. The modern near-real-time predicting system turns out to be more extensive and exact than the Holland’s wind model. Besides, the idea of the Monte Carlo simulation approach, an accepted hurricane simulation method, is briefly stated for the sake of complete understanding.
The use of ultrasound for development of baker’s yeast activation technology
Authors: Krasnikova E S , Babushkin V A , Morgunova N L , Krasnikov A V
Published: November 2020

Various approaches are used to improve baker’s yeast technological properties of and final products quality. Because of low-frequency ultrasound does not have a destructive effect on yeast cells, the aim of our research is to test a new method of improving the technological properties of baker’s yeast using low-frequency ultrasonic cavitation. The object of the study was active dried baker’s yeast Saf-levure (France). All experimental and control samples were processed in a “Grad” ultrasonic bath (Russia) with different intensities and processing times at a frequency of 35 kHz. It was shown that precure of baker’s yeast with ultrasound at a frequency of 35 kHz, an intensity of 0.5-1 W/cm2 and an exposure of 1 and 3 minutes redound to improving the baker’s yeast technological properties: the yeast specific growth rate increases by 1.8–2.7 times, and yeast rising power - by 1.2–1.6 times. At the same time, baked with ultrasonic-treated yeast bread has significantly improved physicochemical and organoleptic characteristics compared to traditional bread. Acidity and humidity of the bread crumb decreased by 1.2 and 1.3 times and porosity increased by 1.6-2.5 times with an increasing the time and intensity of the sonication. With increasing of sonication time and intensity, the bread crust became golden brown, the color of the crumb became lighter, and the loaf shape fluffier. The best results are obtained after precure of baker’s yeast suspension with ultrasound at a frequency of 35 kHz, an intensity of 1 W/cm2 and an exposure of 3 minutes.
Application of luminescence spectral assay for monitoring of intracellular metabolism in hepatocytes
Authors: Akchurin S V , Larionov S V , Krasnikova E S , Akchurina I V , Krasnikov A V
Published: November 2020

The method of evaluation of intracellular metabolism level in chickens’ hepatocytes, using luminescence spectral analysis with 5-([4.6-Dichlorotriazin-2-yl]amino) fluorescein hydrochloride (DTAF) is proposed. The dynamics of proteins content in chickens’ hepatocytes under experimental escherichiosis and in intact poultry was established using this method. A gradual increase in the proteins content in hepatocytes of intact chickens was revealed from 1 to 30 days. The proteins content in hepatocytes of chickens with experimental escherichiosis was gradually increased during the monitoring period, to the exclusion of the sixth day indicators, which were kept at fourth day level (4th day - 2.15 ± 0.01; 6th day – 2. 15 ± 0.02). Moreover, these indicators were less than similar indicators of the control group throughout the experiment.
Control of a flexible inverse pendulum based on the singular perturbation method
Authors: Abbas Zainib Hatif
Published: November 2020

In this article, a partial differential equation model for a flexible inverted pendulum system is derived by using the Hamilton principle. Specifically, problems of stabilization and the optimization of such a system are considered. In addition, the singular perturbation method has been used to divide the partial differential equation model for a fast and a slow subsystem. For a fast subsystem stabilization, the control algorithm proposed a boundary force applied at the free end of the beam which proved that the closed-loop subsystem is appropriate and exponentially stable. To stabilize the slow subsystem, a sliding mode control method was used to design the controller, while the method of linear matrix inequality was used in designing the sliding surface. In conclusion, it was shown that the slow subsystem is exponentially stable.
Small vibrations of mechanical systems in the case of degenerate eigenvalues
Authors: Pozhalostin A A , Goncharov D A , Panshina A V
Published: November 2020

Free vibrations of mechanical and hydrodynamic systems are considered. Some well-known works in this field are summarized and some aspects of computational nature are discussed. The eigenvalue boundary value problem is solved in the case of multiple roots for a system with n degrees of freedom. The case of the zero root of a semidefinite system is considered. The question of orthogonality of forms of natural oscillations is considered. It is shown that in some cases, the proximity of eigenvalues occurs in problems of dynamics of an aircraft containing elastic containers with a liquid. On the example of a mechanical analog of transverse vibrations of a cylindrical tank with a liquid, the possibility of rotation of the free surface of the liquid is shown.
Biometric identification and authentication based on a new method of a pulse wave contour forming
Authors: Gerashchenko M S , Fateev A G , Markuleva M V , Astafyev A N , Zefirov S L , Gerashchenko S I
Published: November 2020

The paper considers authentication methods, including biometric. The advantages, disadvantages and limitations of the known authentication methods are considered, and for the first time it is proposed to use hydrocuff pulse wave technology for biometric identification. A parameters set characterizing the pulse wave contour and its derivatives is defined. As the pulse wave mathematical processing result, a multiparametric feature space is formed. The paper considers the main problems that arise when collecting source data. To solve legal and ethical issues, as well as reduce the cost of forming a database, the possibility of applying algorithms for generating synthetic biometric images has been proved. Synthetic biometric images are designed to use neural network technologies for identification and authentication based on the large databases analysis.
Application of luminescence spectral assay to evaluate the results of a scientific experiment
Authors: Akchurin S V , Larionov S V , Krasnikova E S , Akchurina I V , Krasnikov A V
Published: November 2020

The method of characterization of functional state of epithelium of mucous membrane of alveolar glands of poultry proventriculus, using luminescence spectral assay with fluorescent dyes Ethidium bromide (EtBr) and 5-([4.6-Dichlorotriazin-2-yl]amino) fluorescein hydrochloride (DTAF) is offered. The dynamics of nucleic acids and proteins content in chickens’ cells under experimental klebsiellosis in antibiotic-treated poultry is established using this method. It is found that at the 2th – 7th days of treatment the markers of the cells functional status in the experimental group chickens are similar to those of poultry of the intact group.
Investigation of the reflection coefficients of apple skin when removing in the garden and during storage
Authors: Rodikov S A , Palfitov V F , Butenko A I
Published: November 2020

Antonovka apples, yellow and green, which were picked on August 25 and September 1 have been analyzed. The reflection coefficients of the apple surface were measured at wavelengths of 700 and 750 nm. R750 / R700 ratio was used to estimate the chlorophyll content in the skin. It is shown that the reflection coefficients decrease in storage with time. It is proved by the change in the structure of the apple tissue; the light is absorbed to a greater extent by it. The change in the content of chlorophyll in the skins of apples remains at the same level during the storage. There are some fluctuations in its content. It has been shown that fruit diversity increases with the storage time.
Special aspects in interference of in-phase and anti-phase waves with unequal phase velocities in coupled lines under pulse impact
Authors: Sychev A N , Malyutin N D , Trenkal E I , Malyutin G A
Published: November 2020

We considered the propagation of a short pulse in the picosecond range in coupled lines with a ratio of phase velocities of anti-phase and in-phase waves of 3:1. We showed experimentally a special aspect in the interference of in-phase and anti-phase waves in such structures, which leads to the input pulse separation between three ports without a significant energy loss associated with the reflection from the input. The wave interference was found to lead to a change in the directional properties of the structures under consideration and a separation of the pulse spectral components between the ports.
Effect of low intensity laser radiation on sugar content in sugar beet root crops obtained from seeds treated with a quantum generator
Authors: Brizhanskij L V , Brizhanskaya Yu A , Lasica A M , Dorohova A M
Published: November 2020

In the modern world the question of obtaining environmentally friendly food products with the best possible performance is increasingly raised not only in the scientific community but also among the citizens of cities and rural areas. There are many theories and experiments that prove the advantage of the chosen method of exposure to seeds and plants in order to obtain the best result of the final product. One of these areas is the influence of low-intensity laser radiation on plants and their seeds. This article examines the effect obtained from such an impact. And in particular, the authors are talking about increasing the sugar content of root crops obtained from sugar beet seeds treated with low-intensity laser radiation.