bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation of nickel-coated graphene and evaluation of infrared interference performance
Authors: Li Kai , Wang Xuanyu , Gao Yanqing , Dong Wenjie , Li Huiying
Published: February 2022

In this paper, reduced graphene oxide (RGO) was prepared by oxidation-reduction method, and then RGO/Ni composite was prepared by chemical plating method. The RGO and RGO/Ni samples were characterized by the methods of SEM, TEM, XPS, EDS, XRD, etc. The complex refractive index of the samples in 2~14μm infrared wavebands was measured by ellipsometry method, and the infrared absorption characteristic was calculated by DDA method. Then, the infrared interference performance was tested by the method of Fourier transform spectrometer connected with smaller smoke box, and the dispersivity was also comprehensively evaluated by Carr index method. It is found that electroless nickel plating not only can ease the secondary agglomeration between the RGO layers, improve its dispersivity, but also change the electromagnetic properties of graphene surface and significantly improve its infrared absorption. From the infrared interference performance test, it can be seen that the average extinction coefficients of RGO smoke to 3~5 μm and 8~14 μm infrared is 2.56m2/g and 1.8m2/g, respectively. While the average infrared extinction coefficients of RGO/Ni in the corresponding wavebands is 2.9m2/g and 2.55m2/g, respectively. It further indicates that the surface modification of electroless nickel plating can greatly promote the infrared interference performance of RGO. In particular, the far-infrared extinction performance has been obviously improved.
Preparation of modified rare earth lanthanum oxide/polypropylene nonwoven fabric by meltblown method
Authors: Sun Yunhan , Wang Xiaoning , Jia Qingxiu , Yang Jian
Published: February 2022

Lanthanum oxide was organically modified with dopamine and blended with polypropylene, and then lanthanum oxide (La2O3)/polypropylene (PP) nonwovens were prepared by melt blown method. The nonwovens were characterized by FTIR, SEM, TG, mechanical properties and X-ray shielding. The experimental results show that the addition of modified La2O3 makes the fiber arrangement of PP nonwovens more densely arranged and improves the thermal stability of PP nonwovens. The higher the amount of La2O3, the better the X-ray shielding performance of composite nonwovens.
The Effect of UV Degradation of Ketoprofen and Its Influencing Factors
Authors: Zhen Huiwen , Liu Junliang , Zhang Tiejian
Published: February 2022

This paper mainly studies the removal effect of ketoprofen in UV-degraded water and explores the influence of light turbidity, light intensity and other factors on the degradation efficiency of ketoprofen. The results show that deep ultraviolet treatment has a good degradation effect on ketoprofen, which accords with the pseudo-first-order kinetic equations. After irradiation with 1700 μw/cm2 UV lamps for 40 minutes, the maximum removal rate can reach 99.59%. Besides, UV lamps with different irradiation strengths (1300μw/cm2/1700μw/cm2) have similar treatment effects on ketoprofen. Low turbidity (1-5NTU) solutions will reduce the degradation rate of ketoprofen, while high turbidity (5-9NTU) solutions will enhance the degradation rate of ketoprofen. Solution turbidity is increased after UV degradation of ketoprofen.
Research on tunnel damage process based on acoustic emission technology
Authors: Zhu Huangda , Liu Feng , Cui Jiawei , Peng Wangbin
Published: February 2022

For a long time, it is generally believed that the tunnel has excellent seismic performance and can resist earthquake damage, so it will not be damaged. However, according to the survey of tunnels after the Wenchuan earthquake in China, 110 tunnels were damaged to varying degrees. In this paper, a series of shaking table tests were carried out on the proportional tunnel model under seismic excitation. Acoustic emission technology is combined with seismic excitation to identify and describe the damage of tunnel lining. The tunnel lining strain and acoustic emission signals are collected in the test. In addition, this paper also introduces the use of acoustic emission technology to describe the damage of tunnel lining. Taking the crown as an example, through the correlation analysis of amplitude, counts and energy, it is preliminarily judged that the crown is damaged under working conditions 7 and 8; Then combined with strain analysis, it is proved that the correlation analysis is reasonable. Finally, the rationality of correlation analysis is further explained by the changes of counts, energy, and its cumulative parameters with time. At the same time, the damage process of tunnel lining under seismic excitation is described by defining damage variables, which can be divided into three stages: initial compression elastic stage, yield failure stage and residual stage.
Research on rail crack detection technology based on magneto-optical imaging principle
Authors: Xu Chen , Xu Guili , He Junwei , Cheng Yuehua , Dong Wende , Ma Limin
Published: February 2022

The detection of rail top crack is of great significance in ensuring the safe operation of railway. Based on the principle of magnetic flux leakage detection and Faraday magneto-optical effect, a high-resolution and non-destructive magneto-optical imaging detection method is proposed in this paper. This paper analyses the principle of magneto-optical imaging, establishes a rail magnetic flux leakage detection experimental system based on magneto-optical effect, and detects the rail specimen with crack through experiment. The experimental results show that the change of crack width and depth will affect the magneto-optical imaging results, and the minimum crack size that can be detected by this experimental system is 0.4mm wide and 0.5mm deep. This paper realizes the detection of rail crack defects by using magneto-optical imaging method, and provides the basis for building an efficient, portable and high-resolution rail non-destructive testing equipment.
A digital microfluidic system with integrated electrochemical impedance detection arrays
Authors: Jin Kai , Huang Qi , Hu Chenxuan , Hu Siyi , Li Jinhua
Published: February 2022

Electrochemical sensing provides a new way for miniaturization and low cost of equipment. Meanwhile, digital microfluidic (DMF) technology is making lab-on-chip a reality. The two technologies are essential in the point-of-care area. Electrochemical detection on electrodes and DMF-based droplet driving electrode realize their respective functions by means of electrical signals. In terms of working mode, it seems to have certain similarity, and electrochemical sensing seems to be more suitable for integrating digital microfluidic systems. We thus integrated electrochemical sensing on an active matrix (AM) DMF system. As a common transparent conductive glass, indium tin oxide (ITO) has been widely used as the top plate of the digital microfluidic chip. In this work, we used ITO glass with patterned interdigital electrodes as the top plate of the AM-DMF chip. We achieved on-chip droplet volume detection by electrochemical impedance spectroscopy (EIS). We also proposed a novel sample dilution method on the DMF chip. It takes only 30 seconds to dilute solutions into 4 different concentrations. We then analyzed droplet samples of different concentrations with EIS method. And the correlation coefficient of the fitted curve is as high as 0.9964. In conclusion, EIS is a powerful detection technology for fast, high-integration and low-cost detection on DMF system. The integration of EIS and DMF can be used in various biochemical analyses in the future.
Masked Face Detection and Calibration with Deep Learning Models
Authors: Li Xingze
Published: February 2022

Under the COVID-19 pandemic, the demand that face detection devices should be enhanced to detect masked faces is imperative. In this study, we utilize several state-of-the-art face detection models and compare them on various unmasked and masked human face datasets. Moreover, by analyzing the results we obtain, we evaluate these disparate models and discover some problems. Attempting to overcome the problems discovered, we propose and implement several improvements, and acquire more results for analysis. At length, we propose some ideas for future research directions.
Research on Straightness Detection Device for Elevator Guide Rail
Authors: Feng Shuangchang , Liang Yanchun , Chen Jie
Published: February 2022

The elevator guide rail is composed of a plurality of section by section guide rails in series. The straightness of the guide rail needs to be detected when the elevator is installed. There are many detection methods in the prior art. The first is the vertical line method, but this method is too backward, low precision, time-consuming and laborious; The second is to use RSU (elevator guide rail straightness dynamic detector) for measurement. Its basic principle is to install RSU in the lift car. When the car slides up and down along the guide rail, multiple distance (displacement) sensors detect the horizontal offset of the guide rail in real time, and finally fit these horizontal offsets to analyze its straightness. The disadvantage of this method is that its accuracy will be affected by car shaking and its own error, and the improvement of measurement efficiency is limited. The purpose of this paper is to provide a straightness detection device for elevator guide rail in order to overcome the defects of the above existing technology. With low cost and high efficiency, it is worth popularizing in the inspection work.
High-temperature digital circuit design for fluxgate sensor
Authors: Zhang Chenhao , Zhang Yiming , Gao Junxia , Li ZhongZheng
Published: February 2022

With the continuous development of integrated electronics and the increasing demand for downhole resource exploration, it has become important to develop a small size, high temperature resistant, high-performance digital fluxgate sensor. Due to the strict size limitation of downhole exploration equipment, some high-temperature devices are generally large in size and have a different performance of the same type of devices, so it is necessary to select the devices that meet the temperature requirements through high-temperature experiments. In this paper, by simplifying the circuit structure and selecting devices through high-temperature experiments, the usability of the circuit structure at 175°C and the stable performance in long-time operation at high temperature were verified.
Research on Adaptive Transmission Protocol of TT&C of Launch Vehicle Based on TDRSS
Authors: Fan Dandan , Han Xingye , Dun Yi
Published: February 2022

The application of TDRSS in TT&C of launch vehicle can improve the coverage and transmission rate of TT&C link. But the transmission protocol based on fixed transmission rate can not ensure the stable TT&C link based on TDRSS. The adaptive transmission protocol proposed in this paper can adjust the transmission rate according to the real-time transmission status during the whole flight. According to the different types of rocket-borne subscriber terminals, the open loop adaptive transmission protocol and closed loop adaptive transmission protocol are designed, which can both keep the stable transmission and improve the transmission efficiency.
Study of Installation Method for Large Parts of Spacecraft Based on Zero-gravity Unloading
Authors: Zheng Lide , Song Xiaohui , Wang Wei , Zhang Qian , Xue Feng , Liu Xu , Gu Lei , Lian Huaqing
Published: February 2022

The zero-gravity unloading method is a process method commonly used in the spacecraft field. It has been widely used in the docking installation and ground deployment test of load equipment such as solar wing and antenna, and it is used according to the situation of solar wing, antenna or other load equipment. Different gravity unloading tooling. This article analyzes and compares various unloading methods according to the installation requirements of a certain model of large parts in the zero-gravity state. On the basis of analysis, it is concluded that the traditional five methods of uninstallation are not suitable for the installation and uninstallation of large-scale equipment modules of this model. It is necessary to carry out targeted design according to the configuration characteristics, main structure characteristics and installation requirements of large-scale equipment to realize large-scale modules. Stress-free assembly in zero-gravity state. As a result, a method for installing large parts of spacecraft based on zero-gravity unloading was proposed, which formed a large-scale component docking technology and realized the smooth assembly of the product.
SC Curreent Interruption Capability and Protection of SiC Based Solid State Circuit Breaker
Authors: Tian Mingyu , Ren Yu , Tian Shipeng , Tan Yuchen
Published: February 2022

This paper presents the short circuit (SC) current interruption capability of a 1.7 kV/72 A silicon carbide (SiC) MOSFET based solid state circuit breaker (SSCB). The interruption process of SSCB is introduced in detail. A test platform is built and the SSCB is tested and discussed at various DC-link voltage, fault inductance and junction temperature. Before the desaturation point (VDS=200 V), SSCB can successfully turn off the SC current. The saturation value of the SC current is positively correlated with di/dt, and the effect of junction temperature (50-150°C) on saturation current is not significant. A SC protection circuit with a response time of 260 ns is proposed and is validated through the test platform.
Security architecture and technology of power Internet of things for energy interconnection
Authors: Zhao Xuesong , Fan Xiaofei , Hou Jing
Published: February 2022

The power Internet of things platform is an important support for the digital innovation service of the energy Internet, covering all links of the power system. There are many new security problems. How to realize the trusted interconnection, intelligent defense and security interaction of the power Internet of things, and how to solve the data, application and key security of the power information system are important problems to be solved in the current power Internet of things, Facing the development of energy Internet, this paper analyzes the security requirements and characteristics of power Internet of things, puts forward the security framework of power Internet of things, and summarizes the key technologies of power Internet of things security.
Different parameter values of Gaussian function analysis on EMI reduction and switching loss in active gate drive of SiC MOSFET
Authors: Li Chentao , Ma Qishuang , Xu Ping
Published: February 2022

Nowadays, wide bandgap(WBG) devices named SiC and GaN were widely used in power electronics system to improve power density and switching speed, meanwhile, electromagnetic interference(EMI) becomes a major drawback in power electronics system based on wide bandgap devices. This article discusses the influence of different parameter values in Gaussian function on EMI suppression, and a trade-off between EMI and losses was also discussed. Experiments were given in this article to analyze different parameter values effect on EMI reduction. This article can give guidance in the Gaussian function generated when used in active gate drive to reduce EMI.
Design of magnetic coupling mechanism for wireless power transmission system based on magnetic flux analysis
Authors: Xiao Jing , Yin Liqun , Gong Wenlan , Wu Xiaorui , Ouyang Jin
Published: February 2022

Aiming at the wireless charging system that can dynamically change arbitrarily in a three-dimensional space such as a smart robot, this paper proposes a new type of magnetic coupling mechanism that combines a disc coil and a spiral coil. It can not only avoid frequency splitting in the short-distance range, but also effectively enhance the coupling strength in the long-distance range. In addition, it can also effectively improve the position robustness and anti-offset ability of the robot’s wireless charging system. In this paper, the geometric framework of the new magnetic coupling mechanism is first given. Based on the analysis of magnetic flux, it is theoretically confirmed that the magnetic coupling mechanism can reduce the coupling strength in the near range, avoid the frequency splitting phenomenon, and improve the coupling strength of the system and the energy efficiency of the system in the long range. Finally, based on the finite element simulation software COMSOL, it is proved that the proposed magnetic coupling mechanism can achieve high energy efficiency output in a large range, and has strong position robustness and anti-deviation.
Bearing fault diagnosis based on XWT-CEEMD noise reduction
Authors: Wei Yuqian
Published: February 2022

In recent years, bearing fault diagnosis has been a research hotspot. In order to improve the reliability of acoustic fault diagnosis, this paper combines Cross Wavelet Transform (XWT) and complementary ensemble empirical mode decomposition (CEEMD) to extract bearing fault features from acoustic signals. Finally, the time-domain features and spectral centroid are input into the SVM for fault classification. The results show that the proposed method can effectively improve the reliability of acoustic fault diagnosis.
Volume calculation of goaf based on 3D scanning
Authors: Zhao Hu , Zou Bofeng , Meng Xianfeng , Duan Qingming
Published: February 2022

The goaf formed by underground mining poses a great safety hazard to the production of the mining area. The accurate calculation of goaf volume is the data basis for the filling and blasting of the goaf, and it also has certain reference significance for the monitoring of collapse accidents. In this paper, the data detected by the 3D ranging scanner is used to build a network model on the Self - developed 3D modeling platform, and the network model is divided into the smallest triangular grid. The algorithm uses the scanner’s laser probe as the common point, accumulates all the minimum tetrahedral volumes constructed by the common point and the smallest triangular grid, and completes the accurate solution of the total volume of the scanned goaf. Experiments and practical applications show that the volumetric algorithm has high accuracy, and has universal applicability to the volume calculation of similar types of space scanning equipment.
New Energy Vehicle Battery SOC Evaluation Method based on Robust Extended Kalman Filterd
Authors: Zhang Jian , Wang Qiang , Meng Fanjie , Shi Hang , Xi Yanjun
Published: February 2022

In actual charging/discharging scenarios of new energy vehicles, low temperature, natural disasters, extreme weather, electromagnetic radiation and other factors will cause strong noise interference in SOC evaluation. Aiming at the problem of SOC evaluation accuracy in extreme environments, a power battery SOC evaluation method based on robust Kalman filter is proposed. The experimental results prove that the method is suitable for the accurate assessment of SOC in the charging/discharging process of the power battery of new energy vehicles under the interference of complex and harsh environment noise, and it has good robustness.
Failure causes and solutions of relay protection switching power supply
Authors: Zhang Hongyue , Liu Zhiwen , Fan Zhanfeng , Song Hongtao , Niu Zhilei , Xiong Zhangxue , Deng Maojun , Shuai Jiang , Li Wenzheng , Li Xinwen
Published: February 2022

Relay protection device plays a key role in the stable operation of power grid, and the failure of switching power supply is the main reason for the unstable operation of relay protection device. This paper studies the failure causes of relay protection switching power supply, and concludes that electrolytic capacitor is the key component leading to the failure of power plug-in. At the same time, the failure mechanism and life influencing factors of aluminum electrolytic capacitor are deeply studied, and the improvement measures are put forward. According to the research results of this paper, the switching power supply has the characteristics of high reliability and long life.
Research on Foldable Elevator Manual Turning Device
Authors: Feng Shuangchang , Chen Jie , Liang Yanchun , Chang Xiaoqing
Published: February 2022

In the elevator main engine room, turning gear is one of the indispensable safety devices. The elevator turning gear is used to drive the main engine to rotate when the elevator is closed, and then stop the car at the corresponding position for rescue. The elevator turning mainly includes a disc and a drive shaft, wherein the drive shaft is provided with a gear, which is used to cooperate with the gear on the traction wheel of the main engine to drive the elevator traction wheel to rotate. The turning gear needs to be suspended when not in use. Because the disc is perpendicular to the drive shaft, when the drive shaft is normally installed on the disc, the drive shaft is horizontal, which will affect the space in the main engine room. Of course, there is also a separate design between the drive shaft and the disc. When the drive shaft needs to be installed on the disc through tools, the installation process is more troublesome. In order to solve the above technical problems, this paper studies a foldable manual turning of elevator, which saves space and is easy to install.
Research on Non-uniform Interrupted Sampling Repeater Jamming for Phase Coded Radar
Authors: Luo Zhihao , Li Jianbing , Dong Xueyu , Sun Jianbang
Published: February 2022

Because of using correlation processing technology, it is difficult for traditional jamming patterns to achieve the desired jamming effect on phase coded radar. At present, the forward deception jamming of phase coded radar is mainly realized by uniform interrupted sampling repeater jamming (UISRJ). In order to solve the problem that the UISRJ can only produce a single and delayed false target, a kind of non-uniform interrupted sampling repeater jamming (NUISRJ) is proposed. The non-uniform sampling pulse train is generated through pseudo random sequence, and then sampled and forwarded to generate jamming signal, which is processed by radar pulse compression to form dense false targets. Combining the theoretical analysis and simulation results, it can be seen that the NUISRJ has the dual effects of suppressing jamming and spoofing jamming, and the distribution of false target string is more random, including the leading and lagging false target. The amplitude and coverage area of false targets group can be controlled by adjusting sampling pulse width and forwarding times to effectively implement jamming.
Research on Equalization Technology of Broadband Satellite Communication Channel
Authors: Jiang Jie , Zuo Jian , Feng Hao
Published: February 2022

Satellite channel is the representative non-linear channel with limited frequency band. The random change of the channel causes the communication stability to be affected. With the development of satellite communication technology, the bandwidth of satellite communication has increased and the data rate has also increased significantly, resulting in more serious code interference, which has become a key factor affecting communication quality. Finding an efficient equalization technology to eliminate channel inter-code interference is the key to ensuring satellite broadband communications. This article first briefly discusses the principle of eliminating inter-symbol interference and common equalizer algorithms, and summarizes the main factors that affect the performance of channel equalization algorithms. On this basis, an improved LSTM blind equalization algorithm is proposed.
Study of Spacecraft Low Frequency Cable Installation Technology Oriented to CSB Bus
Authors: Song Xiaohui , Wang Wei , Xing Xianing , Zhang Qian , Liu Xu , Lian Huaqing , Gu Lei
Published: February 2022

In response to the needs of spacecraft cable three-dimensional crossover layout, research on cable installation methods based on CSB bus has been carried out. Aiming at the status of using CSB bus cable in the satellite communication cabin of DFH-4 platform for the first time, on the basis of detailed analysis of the performance of CSB bus, the laying and binding methods are analyzed and tested, and the cable installation method on the carbon fiber bracket is proposed. Technical solutions. It has been proved through practice that this method meets the actual needs of satellites, solves the problems of laying and tying the bus cables of the communication cabin, and effectively meets the needs of the spacecraft cable three-dimensional crossover layout, and greatly improves the spacecraft assembly efficiency.
Application of Information Processing System Based on DSP in Electronic Information Engineering
Authors: Huang Jingbo
Published: February 2022

On the one hand, target tracking technology is widely used in navigation, guidance, alarm and monitoring and other military fields, on the other hand, it is also widely used in civil fields such as traffic information monitoring and security. This paper mainly studies the application of information processing system based on DSP in electronic information engineering. This paper introduces DSP information processing system in detail. Aiming at the comprehensive requirements of real-time and tracking performance of the target tracking system, multi-feature fusion optimization method is adopted to improve the particle filter tracking algorithm to improve the accuracy of the tracking algorithm. In this paper, the simulation results show that the improved algorithm has a certain scale and occlusion robustness, and can adapt to long-term stable real-time tracking.
Analysis and Research on the Interference of Civil Aviation Radio Navigation Equipment
Authors: Zhang Xianhao , Luo Zhongmei , Kang Guo
Published: February 2022

Aiming at the problem that civil aviation radio navigation equipment is susceptible to interference more and more frequently, through the study of aviation radio interference theory, the categories of civil aviation radio interference are classified, and then the source and harm of radio interference are analyzed, and specific measures to solve the interference problem are proposed. This is of great help to solve the difficult problem of radio interference signals, and is conducive to reducing the probability of civil aviation radio navigation equipment being interfered, thereby ensuring aviation flight safety.
Research on Application of Artificial Intelligence in Communication Network
Authors: Bai Zijun
Published: February 2022

Artificial intelligence has been widely utilized in people’s lives, especially in communication. The article provides a review of the recent research status of the application of artificial intelligence in communication, the usefulness of big data, machine learning, and cloud computation in this field. Several examples of how artificial intelligence is used to communicate are illustrated to discuss better and form a framework of modern artificial intelligence applications. The aspects of concern in ethics of using artificial intelligence are also mentioned, as ethics are the principles judging whether the technologies are suitable for humans to use or not. In order to predict the future development of communication, an introduction of previous progress in the field of communication is provided and sorted into categories of wireless communication, ethical concerns, and network monitor and control. This study confirms that the future development of artificial intelligence is mainly in two aspects: SDN (Software-defined network) and NFV (Network function visualization). AI will thus be used in enhancing communication efficiency.
Handover Scheme of LEO Satellite Network Based on Geographical Division Scenario
Authors: Liu Feng , Zhai Yurong
Published: February 2022

On the basis of completing the division of geographical regions, for the problem of satellite mobile handover, this paper proposes a satellite selection algorithm for selecting the satellite with the longest coverage time to reduce the handover rate. Also based on the idea of "centralized location management", this paper proposes the satellite handover scheme based on the geographical division scenario to update the satellite routing table entries and ensure the correct routing of data packets. Regarding the user handover problem, based on the idea of "decoupling data transmission and address update", a user handover scheme based on geographical division scenario is proposed, which reduces handover delay and signaling overhead compared to traditional satellite network handover schemes.
The Electronic and Ferroelectric Properties in Strontium and Zirconium Doped BaTiO3 from First-Principles Calculations
Authors: Shen Haolei , Wang Peng , Tan Rongri , Yu Yousheng
Published: February 2022

The structure, electronic and ferroelectric properties of BSZT were investigated based on first-principles calculations. The result of relaxation structure and two-dimensional charge density indicates that the tetragonal crystalline structure is distorted after Sr and Zr doping. The double-well curve fits well with the phenomenological Landau-Devonshire theory. Moreover, the smaller Zr ion displacement leads to a lower spontaneous polarization of BSZT than the original BaTiO3. The hybridization between the 3d states of Ti and the 2p states of O, and the hybridization between the 4d states of Zr and the 2p states of O are observed in the density of states, which is the reason for the ferroelectricity of BSZT materials.
Dynamic Power Allocation in D2D Communications Using Deep Reinforcement Learning
Authors: Zhou Jun
Published: February 2022

Due to the development of communication technology, mobile devices continue to increase. As one of the critical technologies of 5G, D2D communication is an up-and-coming technology. In this paper, multiple D2D pairs usually multiplex the same channel, which will cause serious channel interference. To solve this problem, a distributed deep reinforcement learning framework is proposed, which can well adapt to the power allocation in a dynamic environment. The simulation results show that compared with other benchmark methods, the proposed scheme can improve the overall D2D rate.
Design of Multi-band Compatible Trigeminal Monopole Array Antenna for Unmanned Aerial Vehicle
Authors: Zhang Zhiwei , Lin Bin , Huang Yuting , He Ye , Chen Haoyuan , Zheng Meijie , Wen Shuyao
Published: February 2022

Compared with the performance index of UAV system antenna, a compatible trigeminal monopole array antenna is proposed. This antenna uses photosensitive resin as the substrate material, and can be made with UAV shell using 3D printing technology, realizing the integration of the antenna system and UAV. The antenna uses a trigeminal monopole antenna as the basic radiation unit, which is arranged in accordance with the Sierpinski fractal structure to form fractal radiation array. While enhancing the radiation through the array, it ensures that the antenna has a larger working bandwidth. In radiation performance test, the antenna is operating over a frequency spectrum of 1.038-11.916 GHz, and the minimum S11 is -37.92 dB. The proposed antenna has multi-band compatibility, better radiation performance, and greater performance redundancy.
A method of multi-channel SAR moving target detection and imaging based on complex CNN
Authors: Deng Zhao-Rong , Zhang Xiang-Yang , Gao Wei-Min , Zhang Hong-Ping , Xu Yin-Qiang
Published: February 2022

Aiming at the problem of the detecting difficulty and imaging the moving target submerged in clutter, a multi-channel Synthetic Aperture Radar (SAR) moving target detection and imaging method based on complex Convolutional Neural Network (CNN) is proposed. First, using Range Doppler algorithm (RDA) to image SAR data to obtain images with clutter, noise and defocused moving targets. Then, the SAR image is used as the input of complex CNN. A SAR image with the clutter and noise eliminated, and the moving target in focus is obtained after processing by neural network. The simulation experiment results show this method is effectiveness.
Data enhancement method for object detection
Authors: Yin Zhijian , Xu Lei , Yu Hanqing , Yang Zhen
Published: February 2022

A data enhancement method for object detection is proposed to address the problem that there are few data enhancement means for target detection. This method has obvious advantages for small targets and scenarios where the target background is lacking. It is also a method to solve the problem of small and unbalanced samples. In this paper, the object is subtracted from the bounding box, and after processing, it is fused into a new image using various image classification improvement means such as random brightness, random contrast, random rotation, random cropping, etc. Using mixup-like fusion methods, and XIOU is proposed to guarantee the t intersection ratio of the target synthesis during synthesis. An improvement of 2% is obtained on yolov3 over the VOC dataset.
Research on face tracking Algorithm Based on Detection and Supervision Tracking
Authors: Yuan Gang , Lv Fengkun , Xu Zhihao , Luo Lv , Rong Yi , Zhang Yanan , Tian Zheng
Published: February 2022

Accurate face detection and tracking is widely used in many social life scenes. However, the uncontrollable background noise and random illumination change in the application scene will reduce the detection accuracy of the tracked target, and the rotation, occlusion and overlap of the tracked target will also affect the accuracy and success rate of the tracking algorithm. In order to solve the above problems, this paper proposes a method that uses deep learning detection method to supervise the correlation filter tracking algorithm to improve the success rate of de-tection and tracking. First of all, in the first frame of the picture, we use the deep learning SSD (Single Shot MultiBox Detector) algorithm to detect the face, and take the detected face as the tracking target, and use the correlation filtering algorithm DSST (Discriminative Scale Space Tracker) Tracking in the process of tracking, face detection is continuously carried out on the tracking target, and the detection results are used to monitor the tracking results, so as to reduce the target drift caused by the boundary effect, thus improving the accuracy of the tracking algorithm. The algorithm is tested and verified on OTB100 data set. The final experimental results show that the accuracy of this algorithm is obviously better than the mainstream classical algorithm, and the frame rate meets the real-time re-quirements.
Development and evaluation of a lead oxide flexible skin dosimeter with a silicon passive layer
Authors: Yang S.W. , Han M.J. , Park S.K. , Choi M.Y. , Moon Y.M. , Bae S.I. , Park S.H. , Kang Y.R. , Rah J.E. , Chung J.B. , Kim J.Y.
Published: February 2022

Normal tissues are also exposed during radiation therapy. In
particular, the skin is highly sensitive to radiation. Therefore,
care should be taken regarding excessive exposure, and the dose
irradiated to the skin should be measured accurately. In this study,
a skin dosimeter that can be attached to the human body was
manufactured using a silicone binder, and a new type of passive
layer using silicon was applied. In addition, the manufactured
dosimeter was evaluated to establish whether it could be used with a
skin dosimeter. The observation of the surface of the dosimeter
through SEM analysis showed that cracks did not occur on the surface
of the silicon passive layer PbO dosimeter when it was bending. The
bending silicon passive layer PbO dosimeter's relative standard
deviation was 1.45%, meeting the evaluation criteria of 1.5%. The
linearity evaluation showed that the R
2 of the bending silicon
passive layer PbO dosimeter was 0.9996, satisfying the evaluation
criterion R
2 of 0.9990. The PDD measurements showed that the
D_max points matched. As the silicon passive layer PbO
dosimeters showed no cracks when bending, high signal stability, and
accuracy in reproducibility, linearity, and PDD measurement results,
it could be suitable for application as skin dosimeters.
Efficiency of Zantedeschia Aethiopica and Nasturtium Officinale in the Removal of COD and BOD5 in Domestic Wastewater from The Santiago Antúnez De Mayolo El Tambo Urbanization - 2021
Authors: Blancas M , Cerrón A , Camargo-Hinostroza S
Published: February 2022

Domestic wastewater is dumped directly into the water resource affecting it, for which it is important to implement environmental control and prevention. In this research, the aim is to determine the efficiency of Zantedeschia aethiopica (Water Lily) and Nasturtium officinale (Water cress) in the removal of COD and BOD5 in the domestic wastewater of the Santiago Antúnez of Mayolo El Tambo Urbanization - 2021. To achieve the objective was to collect 36 L of domestic wastewater from the Santiago Antúnez de Mayolo El Tambo Urbanization, which were placed in three glass ponds of 35 cm × 25 cm × 25 cm, which each contained 12 liters of water; the first pond was considered as zero treatment (T0) or control treatment, In the second pond, the Zantedeschia aethiopica (Water Lily) species was placed and it was considered as treatment one (T1) and in the third pond the Nasturtium officinale (Water Cress) species was placed and it was considered as treatment two (T2). After 31 days in the zero treatment (T0) it was obtained that the domestic wastewater from the Santiago Antúnez Urbanization of Mayolo El Tambo has a concentration of 41 mg/L of BOD5 and 72.4 mg/L of COD; In treatment one (T1) with the Zantedeschia aethiopica species (Water lily) the final concentrations of 32.1 mg/L and 68.7 mg/L of BOD5 and COD were obtained respectively; In treatment two (T2) with the species Nasturtium officinale (Water cress) the final concentrations of 39.79 mg/L and 56.5 mg/L of BOD5 and COD were obtained respectively. It can be concluded that both species were efficient in removing BOD5 and COD; the Zantedeschia aethiopica species (Water lily) obtained a removal percentage of 21.71% and 5.11% for BOD5 and COD respectively; the species Nasturtium officinale (Water cress) obtained a removal percentage of 2.95% for BOD5 and 21.96% for COD.
Potato Farming Biologization as a Food Security Basis
Authors: Nikolaeva F V , Lukina F A
Published: February 2022

The paper discusses the experimental results of growing potatoes based on scientifically grounded crop rotations and biologized technologies. The main biological agriculture problem is to maintain the ecological balance in the biosphere based on the search for natural reserves to increase crop productivity while improving soil fertility and quality of crop products and reducing costs for energy and resources required for their production. The studies have revealed that green manure affects not only the yield of potatoes but also the population of soil microorganisms, which leads to increased reproduction of bacteria and actinomycetes. The highest yield was recorded in the crop rotation with sweet clover – 16.8 t/ha; when plowing the pea-oat mix, it reached up to 15.4 t/ha, and when plowing oats - up to 16.3 t/ha, which increased yield by 0.5-2.9 %. From among the most effective environmentally sound technologies, organic fertilizers, growth stimulants, and various fungicides are also applied. When using various organic fertilizer doses in combination with mineral fertilizers, the yield of potatoes and the content of phosphorus and potassium increase. Complex treatments of plants with ‘Ridomil Gold’ and ‘Cuproxat’ fungicides during the growing season reduce the incidence of fungal and bacterial diseases in both plants (by 3.7-3.9 %) and tubers (by 2.7-3.5 %) during the storage period.
Forming an Information System for Assessing Mineral Resource Availability for Enterprises
Authors: Dadykin B C , Sidorenko A S
Published: February 2022

Forming an information system for assessing mineral resource availability for enterprises is currently of particular relevance due to the necessity to provide a number of industrial enterprises with proven mineral reserves for the prospect of the licensed period of the field exploitation. An exploration enterprise in the course of its operation is subject to influencing various factors, which can be conditionally divided into the controlled and the uncontrolled ones. The first group includes such factors as economic and technical-technological factors. The second group includes natural, socio-demographic and ecological ones. The author carries out the controlled factor simulation as a part of the management system model of a geological exploration enterprise to determine the principles of managing the system and factors affecting the state of the controlled object represented by this enterprise. In this paper, the authors design the management system of a geological exploration enterprise and evaluate the influence of the environmental factors on the system. When determining the prospects, the criteria of infrastructural (availability of road communication) and resource (human, technical, technological, financial resources) availability during the field exploration were also considered. As a result, an information system for assessing mineral resource availability for enterprises was formed as a set of indicators for assessing the availability. This work was supported by the grant given by the President of the Russian Federation No. MD-2409.2020.5.
Improving the Safety of the Rectification Unit for the Production of Alkylphenols
Authors: Kh Kurbangaleeva M
Published: February 2022

As a result of the study, the analysis of occurrence of fire hazardous situation during the operation of rectification column of production facility of one of the city’s enterprises was carried out. This installation refers to facilities for which additional safety requirements are imposed. The main danger of the operation of rectification columns and their piping used at the installation is thefear of depressurization and theinitiation of gas contamination and fire situation on the site. As theresult of the fire, the rectification column and supporting metal structures can be in flame or be under the influence of thermal radiation from the flame in adjacent column, which can lead to the collapse of structures or to losses of bearing capacity under the influence of high temperatures. Depending on the height of the column, the water supply system can have different ways of distributing water: at small height of the column, manual water nozzles are used with the use of fire hydrants; at considerable height of the columns, stationary water irrigation systems (irrigation rings) are used.
Modeling Food Security Processes with Uneven Transportation of Goods and Economic Aspects
Authors: Kovalev K E , Galkina J E
Published: February 2022

The article discusses the methodology of modelling the work of the warehouse complex, which allows you to optimize its operation. The experience of creating various simulation models in the simulation environment is analysed in order to optimize the operation of transport and logistics complexes, the results of which were increased productivity and reduced costs. Planning a warehouse complex is a key stage in this process. Mistakes made during planning can cause the inability to use a warehouse with a high level of efficiency and significant financial losses for an organization. The following stages, such as optimization and organization of the warehouse operation, also play an important role.
Meat Productivity of Cattle When Using in Their Diets Local Non-Traditional Feed Additives in a Sharply-Continental Climate of Yakutia
Authors: Grigorev M F , Grigoreva A I
Published: February 2022

The article presents the research results of non-traditional feed additives’ impact on cattle meat productivity in the sharply continental climate of Yakutia. There were formed three experimental groups of young cattle given the age and the live weight. Meat productivity was estimated by killing products, organoleptic and physicochemical parameters of beef. It was found that the inclusion of local mineral feed additives in animal’s diet contributed to the increasing of carcass mass on 3,4 – 7,9 %, lean tissue on 8,5 – 15,7 kg, and fat tissue on 1,3 – 1,5 kg. The assessment of meat products showed that the experienced groups’ samples had high points. Thus, the researches have shown the effectiveness of local non-traditional feed additives in the sharply continental climate of Yakutia.
IT Tools for Managing Ecological Hazards
Authors: Prokofeva E N , Vostrikov A V , Nekrasov H A , Bragin N E , Malcev M O
Published: February 2022

The development of modern IT tools is a key vector of development in the management of natural hazards and geosciences. Thanks to the creation and implementation of geographic information systems (GIS) and technologies, monitoring of the area is greatly facilitated and the accounting of natural resources becomes streamlined. Geoinformation systems allow to take into account the social and environmental situation, accurately determining the qualitative and quantitative characteristics, structure, and location of objects. This allows the authorities at different levels to develop social infrastructure most effectively and correctly locate objects of it. In addition, geographic information systems are very effective for determining the location of an object. The requested information is provided in the form of detailed maps with additional details in texts, graphs, and diagrams. GIS tools are not a single program, but a package of programs, they have different interfaces and capabilities of working with data. Usually, the one that is best suited for the task is selected from this software package. An example of the choice of effective tools and related research in work with BigGeoData are presented in the article about aero monitoring use case.
Veterinary and Sanitary Examination of Commercially Important Broad Whitefish in Ust-Yansky Municipality, Yakutia
Authors: Sidorov M N , Tomashevskaya E P
Published: February 2022

This paper presents the results of veterinary and sanitary examination of fish caught in Ust-Yansky Municipality, Republic of Sakha (Yakutia). Subject to examination was broad whitefish. The goal was to see if the catch was in line with the safety regulations per GOST. To that end, fish freshness was tested organoleptically, physically, chemically, and microbiologically. Veterinary and sanitary examination concluded that all the broad whitefish caught in the Ust-Yansky Municipality was “dubiously fresh” in terms of organoleptic indicators applicable to the mucus, scales, mouth, eyes, gills, fins, anus, muscles, abdominal cavity, and internal organs. Physical and chemical tests (pH, peroxidase reaction, copper sulfate reaction, ammoniacal nitrogen content, and hydrogen sulfide content) returned indicators that matched the category of ‘fresh fish’. Microbiological tests showed that TVC, CFU/g was within the acceptable limit of 1*105, coliforms, S. Aureus, Salmonella, and Listeria monocytogenes were not isolated. Parasitological testing did not detect helminths or their larvae in the muscles. Reason being, fish carry many species of helminths that threaten humans. Toxicological testing revealed Pb content of 1.1±0.2 mg/kg, which did not correspond to the maximum acceptable concentration. HCH and DDT levels were within acceptable limits as well. Radionuclide testing reveled cesium137 and strontium90 contents within the acceptable concentrations per TR TS 021/2011 Food Safety. Broad whitefish was subjected to all veterinary and sanitary tests, one of which indicated dubious quality.