bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental research on terahertz scanning imaging system based on S-parameters
Authors: Zhang Yanbo , Li Xiangdong , Zhao Xingwen , Tian Xianzhong , Yang Zijiang 
Published: February 2022

Abstract
Due to the limitations of the detector in the terahertz (THz) scanning imaging process and the problems of low contrast and poor visualization effect of original image, a THz continuous-wave scanning imaging system from 75 to 110 GHz is presented. The system is comprised of vector network analyzer (VNA), spread spectrum module, transmit and receive antennas, scanning stage and host computer. In addition, the automatic acquisition and storage of S-parameters is realized by Virtual Instrument Software Architecture (VISA) protocol, and the gray imaging method based on S-parameters is proposed. High-precision structural resolution test board is designed based on printed circuit board (PCB) method and the imaging experiment for the resolution test board is carried out. By comparing with original imaging results, better imaging quality of the system designed in this paper is obtained and imaging results show that the resolution of 1.8 mm could be achieved.
Research on Simulation Experiment Method and Process in Joint Operations System
Authors: Kong Chenyan , Chu Wei , Ju Zhenqi 
Published: February 2022

Abstract
To meet the requirements of joint operations simulation experiment, a framework of joint operations simulation experiment is proposed, design elements in basic scenario before the experiment, design and screening method of experiment factors, characteristics and modeling elements of simulation models during the experiment are studied particularly, and the optimal control flow of the experimental process is designed
Spatio-temporal coverage planning algorithm for multi-UAV and multi-sensor cooperative search
Authors: Zheng Deyan , Liu Chunhui , Huang Lizhen 
Published: February 2022

Abstract
A spatio-temporal coverage planning algorithm for multi-UAV and multi-sensor cooperative search is proposed in this paper, named STC-MARL, which is based on multi-agent reinforcement learning and allows several UAVs equipped with two types of sensors to learn to complete full view of a field of interest (FOI). The proposed STC-MARL algorithm can make participating UAVs to learn from the environment to complete the full coverage of a specific FOI while minimizing field of views (FOVs) interacted with each other. The experimental results show in detail with simulation that the UAVs in the mission can effectively accomplish the task of spatio-temporal coverage planning.
Research and analysis of infrared image enhancement algorithm based on fractional differentiation
Authors: Lou Junyi , Ji Jiajia , Zhou Qin , Li Xi 
Published: February 2022

Abstract
Due to the inherent defects of infrared imaging systems and the influence of the external complex environment, infrared images have low contrast, blurred edge details, low signal-to-noise ratio and poor visual effects compared with visible images, which have a great impact on the subsequent feature extraction, detection and identification and target tracking, and cannot meet the requirements in military, medical and civilian fields. The current technical deficiencies of infrared imaging devices at the hardware level cannot fundamentally solve these problems, so it is especially necessary to enhance infrared images from the perspective of algorithms. We propose an improved fractional differentiation algorithm that enhances the contrast of infrared images and the contrast of the images is controlled by the fractional order. Experiments and analysis show that the proposed method has good feedback for enhancing the contrast of dark images, and it can effectively enhance the edge information and detail information.
Image defogging system and algorithm research based on MATLAB platform
Authors: Chen Yongchang , Sun Xiangrui , Qiu Xiaofeng , Wang Xinyan 
Published: February 2022

Abstract
Since the Reform and Opening up, the characteristics of China’s high-quality economic development have become more distinctive, the adjustment of economic and social structure has been continuously optimized, the kinetic energy has been continuously enhanced, and the degree of industrialization has been significantly improved. However, it has also caused some environmental problems, and haze pollution is one of them. The haze weather with low visibility has a certain impact on people’s daily travel, transportation and navigation. Because the images taken under the haze condition will be degraded to varying degrees and the image details will be lost, the effect of identifying and processing the degraded images in the later stage will be reduced. Therefore, in order to clear and restore the degraded image, we developed a defogging system based on MATLAB software. The system mainly uses histogram equalization, MSR and dark channel a priori defogging algorithms to restore fog degraded images. The results indicate that various defogging algorithms are able to enhance the clarity of the picture to varying degrees. The successful implementation of the defogging system lays a theoretical foundation for the in-depth research and application of fog image defogging processing technology, and has good technical operability.
Research on optimization method of routing buffer linkage based on Q-learning
Authors: Han Zhonghua , Qi Hongfeng , Chang Daliang , Gong Wei , Dai Shilong 
Published: February 2022

Abstract
According to the characteristics of the painting process of passenger car manufacturing enterprises, by formulating the routing buffer linkage rules based on the total renewal cost, the linkage process of the bus in the routing buffer is controlled, and an improved Q-learning (Q- The routing buffer of learning) algorithm quickly finds the optimal path method. According to the actual production situation, this method improves the dynamic parameters of the algorithm on the basis of the traditional Q-learning algorithm, and improves the optimization speed and accuracy of the algorithm by establishing the correlation between the work-in-process and its neighboring work-in-process in the current state. Through multiple sets of example simulation tests, the effectiveness of the Q-learning algorithm in solving the optimization problem of routing buffer linkage is verified.
Research on prefabricated component production line mold platform combination method
Authors: Han Zhonghua , Yu Lingfeng , Li Bo , Qi Yuanwei 
Published: February 2022

Abstract
In traditional prefabricated component manufacturing enterprises, there are often problems such as low utilization rate of the platform surface due to poor production plans of the enterprise, resulting in waste of production resources and low production capacity of the enterprise. In order to solve the problem of mold platform combination allocation in the production process of prefabricated component manufacturers, a mold platform combination allocation method based on the combination of machine learning and backtracking is proposed. The backtracking method is used to search for the theoretical best fit combination result, and the improved BL is used. The positioning algorithm simulates the placement process of the mold on the platform, and uses the Apriori algorithm to train the obtained data set to obtain the association rules contained in the frequent item set. When the enterprise re-produces, the prefabricated components are combined according to the association rules for production, and the utilization rate of the platform is improved. The simulation test is carried out with the example data of the prefabricated component manufacturing enterprise, which verifies the effectiveness of the combination allocation method of mold and platform combined with the backtracking method and the Apriori algorithm to solve the problem.
Research on the Test-times Selection Method for the Accuracy Evaluation of Inertial Navigation System
Authors: Wang Dan , Yang Gong-liu , Li Mingming , Luo Yong 
Published: February 2022

Abstract
Aiming at the unreasonable test-times selection method in the precision evaluation of inertial navigation system, this paper puts forward the test-times selection method. The test conclusion confidence, test condition confidence, and the sample confidence limit are included in this test-times selection method for quantitative test-times. In addition, the selection process is illustrated through an example.
Partial discharge detection and type identification of typical defects of XLPE cables under AC voltage
Authors: Liu JiaXin , Wei DeFu , Zhao ZhenWei , Zheng WeiGang , Cui JuYong 
Published: February 2022

Abstract
According to the discharge characteristics of the typical defects of power cables, four common physical models of cable simulation defects are designed and produced under laboratory conditions. The high-frequency current method is used to measure the discharge signals of the four common cable simulation defect models, the data is collected and stored, a two-dimensional discharge map is drawn, and the support vector machine method (SVM) is used for classification.The results show that: the signal distribution range of levitation discharge is the widest, and the signal distribution is long; the tip discharge only generates the discharge signal in the negative half of the cycle; the negative half of the creeping discharge is more dense than the positive half of the cycle; the number of discharges in the positive and negative half of the internal air gap discharge is roughly the same ; discharge of different types of defects is obviously different. Extracting statistical features from its two-dimensional spectrogram for identification, the identification accuracy rate is above 90%, and different types of defects can be effectively identified.
DOA estimation based on density-tapered thinned array
Authors: Tian Jiahao , Zou Yimeng , Zhang Yongsheng 
Published: February 2022

Abstract
In this paper, several classical DOA estimation methods are applied to density-tapered thinned array. The density-tapered thinned array has the advantage that there is no grating lobe in the whole angle scanning range, and the unambiguous angle estimation of the target is obtained. The experimental results show that the classical DOA estimation method can be applied directly to the density-tapered thinned array to obtain satisfactory results, which lays a foundation for the practical application of the density-tapered thinned array. In addition, the effects of sparsity and number of elements on DOA estimation are analyzed, and the advantages of density-tapered thinned array over uniform arrays are verified.
Research on Multi-step Mixed Predictiom Model of Coal Gasifier Furnace Temperature Based on Machine Learning
Authors: Zhao Yanbin , Ma Zhongbin , Han Xuefeng 
Published: February 2022

Abstract
In order to ensure the safe and stable operation of the coal gasifier, it is particularly important to study a new and reliable method for predicting the temperature of the gasifier. In this paper, the coal gasifier furnace temperature prediction is transformed into a time series prediction problem, and according to the non-linear characteristics of the gasifier furnace temperature data set, the LSTM (Long Short-Term Memory) model in the machine learning algorithm is selected for the gasifier furnace.Then use the PSO (Particle Swarm optimization) algorithm to optimize the hyperparameters of the model. The results show that the LSTM model is feasible but the accuracy is slightly lacking. The prediction accuracy based on the POS-LSTM model is significantly improved. It is of great significance to accurately predict the temperature of the gasifier.
Study on the PI/SPEEK nanofiber composite proton exchange membrane for fuel cells
Authors: Wei Peng , Huang Dong , Li Xi , Zhu Bensheng , Cong Chuanbo , Meng Xiaoyu , Zhou Qiong 
Published: February 2022

Abstract
Sulfonated poly ether ether ketone (SPEEK) can be selected as the candidate for proton exchange membrane (PEM) used in the fuel cell for its cheap price, great proton conductivity and stability. To further improve its performance, more SO3H were induced into SPEEK but would result in excessive swelling and losing its stability. Polyimide (PI) nanofibers have excellent mechanical properties and can be a supporter to improve stability. In this work, the PI nanofiber was put in the middle of the SPEEK to create the PI/SPEEK nanofiber composite membranes (NCMs). Its morphology of PI/SPEEK NCMs observed by SEM showed that PI nanofiber was almost in the middle of these NCMs. The proton conductivity and swelling ratio of 3%PI/SPEEK were 271.7 mScm-1 and 20.0% at 60°C and 100% RH, which is 29.6% higher and 90.4% lower than that of pristine SPEEK. It was intact after the single-cell test in the fuel cell and its power density was 199.1 mWcm-2, but for pure SPEEK there was some broken area on it. The reason was that PI/SPEEK can maintain the durability of the channels for the proton to transport and it can be attributed to an interaction at their interface of PI nanofiber and SPEEK. The 3%PI/SPEEK NCM will have a broad application prospect in PEM fuel cells.
Analysis of engineering application requirements of nano coating materials
Authors: Zhong Wenan , Zhang Dongjiu , Wang Yuchao , Zhao Yu , Liu Jianfeng 
Published: February 2022

Abstract
Coatings are the primary means to control the corrosion of marine engineering structures. It is the frontier and hot spot of nano coating materials research to use nano materials to modify anti-corrosion coatings, realize the complementary advantages between different materials, and prepare high-performance, environmental protection, energy saving and functional anti-corrosion coatings. However, with the application of nano coating materials in the atmospheric subtropical coastal environment, there are many problems of poor weatherability. Based on the environmental corrosion characteristics of the subtropical coastal zone, this paper evaluates the environmental adaptability of several nano coating materials in the coastal atmospheric environment, analyzes the engineering application requirements of nano coating materials, and puts forward the measures and suggestions for the development of nano coating materials in marine engineering in view of the main problems existing in the engineering application of nano coating materials in China.
Research and application of polymer-surfactant binary combination flooding numerical simulation
Authors: Zhang Yanyu , Luo Zhaowen , Xie Mengke , Teng Zhiyi , Wang Yue 
Published: February 2022

Abstract
At present, many oilfields in China have entered the stage of high water cut development, and the research on the methods of improving oil recovery has been paid more and more attention. Among them, the application of binary combination flooding is more and more extensive. In view of the target area, based on the fine geological modelling, this paper establishes a binary combination flooding model considering the influence of surfactant on oil-water interfacial tension, the adsorption of surfactant by rock, the shear and degradation of polymer, and the adsorption of polymer by rock. Based on the matching of reserves and production history, the development schemes under different development methods are designed and the development effect is predicted and evaluated, the influence of development mode, injection time and injection-production speed on development effect is also studied. The results show that the development effect of binary combination flooding is the best, which provides a theoretical basis for the subsequent efficient and reasonable development of the block.
Molecular Dynamic Simulation in Organic Semiconductor Investigation
Authors: Gu Junwen 
Published: February 2022

Abstract
The details of charge transfer events inside the organic semiconductor puzzled researchers for many years. This paper focuses on the simulation method’s capability to investigate on polaron’s properties and insights about charge transfer events inside the organic semiconductors. The paper adopts a molecular dynamic simulation method called LMD simulation from the journal of chemical science to model the charge transfer between pairs of fullerene molecules. By performing the simulation, the paper analyzes and evaluates the results it gained and concludes, by showing a large-scale investigation capability and accurate details for a single event, the molecular simulation is capable to study the charge transfer events of semiconductors.
Study on Compatibility of Waterborne Surface Treatment Coatings
Authors: Li Wenbo , Yang Yingfei , Song Dongdong , Zhu Jiran , Xie Yi 
Published: February 2022

Abstract
the severe corrosion of power grid equipment has always been an important factor affecting the service life of equipment. Rust transfer technology is used to treat the corroded equipment to improve the corrosion resistance of transmission grid cabinet equipment in high temperature and high humidity environment. Taking acid modified acrylic acid as the main component, the composite conversion solution was obtained by adding phosphoric acid and phytic acid. Through the surface morphology, electrochemical test and adhesion test after rust conversion, the universality and corrosion resistance of the rust conversion solution were analyzed; Combined with zinc phosphate primer and zinc rich primer, the effects of rust conversion solution on the adhesion and salt spray corrosion resistance of the two commercial primers were studied. The compound conversion solution has good rust conversion effect on atmospheric corrosion rust layer, salt spray corrosion rust layer and damp heat corrosion rust layer; The corrosion resistance and adhesion of atmospheric corrosion rust layer are obviously improved after being treated with rust conversion solution. The adhesion of zinc phosphate primer and zinc rich primer on rust conversion solution is 2.1 times and 0.8 times higher than that of atmospheric corrosion rust layer without rust conversion, respectively. The compound rust conversion solution has strong universality and can convert atmospheric corrosion, salt spray corrosion and damp heat corrosion rust layers. At the same time, it has good corrosion resistance, which can significantly improve the corrosion potential of the corroded surface and reduce the corrosion current density. In addition, the composite rust conversion solution can significantly improve the adhesion and corrosion resistance of the primer coating.
Research of Water Vapor Barrier Property Testing Methods for Hollow Containers
Authors: Li Meng , Liu Lina , Wang Jinxiu , Wang Shifeng , Mao Weichang , Chen Xin 
Published: February 2022

Abstract
Barrier property is a characteristic of hollow containers and can be used to meet the need for shelf life of the contents; the hollow container shape is variable, which makes it difficult for overall barrier property testing. Based on this, this paper discusses the common testing methods of water vapor barrier property of hollow containers. Firstly, the advantages and disadvantages of the traditional weighing method and sensor method in testing the water vapor barrier property of containers are compared, typical applications are taken as an example, and finally two new methods, namely electrolytic sensor method and infrared sensor method, which can quickly and accurately test the moisture permeability of hollow containers, are introduced in detail, so as to achieve good and accurate test for various hollow containers, which can provide reference for related industries in selecting testing technologies for container barrier property.
Synthesis Methods and Influencing Factors of Metal Organic Framework Material MIL-53
Authors: Li Fangqin , Wang Guanjun , Ren Jianxing , Sun Chenhao 
Published: February 2022

Abstract
Regarded as brand-new porous material, metal organic framework(MOF) has a certain ability to remove pollutants due to its high porosity, high specific surface area, adjustable micropore size and easy functionalization. Compared with other metal organic framework materials, MIL-53 has a relatively higher specific surface area and stronger hydrothermal stability, which leads to excellent performance and application prospects in the removal of pollutants. In this paper, synthesis methods of metal-organic framework material MIL-53 are introduced, and the influencing factors in the synthesis process using hydrothermal method are discussed, including the component ratio, type of organic solvent and pH value. Due to less dependence on residence time and organic solvent, mechanical method can reduce energy consumption and has latent value for future application. Among different influencing factors, reducing the pH of solution when synthesizing MIL-53 using hydrothermal method seems to save time and achieve rapid formation.
Study on Synthesizing Polycarbonate with Triphosgene
Authors: E Yongsheng , Lv Ping , Yang Fang 
Published: February 2022

Abstract
Polycarbonate is a widely used thermoplastic engineering plastic with excellent properties. Using triphosgene and Bisphenol A as raw materials, polycarbonate is synthesized by interfacial polycondensation. The effects of catalyst dosage, molar ratio of raw material, reaction temperature and reaction time on the molecular weight of the product are investigated, and the optimal reaction conditions are obtained. The structure of the product is verified by infrared absorption spectroscopy. The rotary viscometer measures the intrinsic viscosity of the sample and calculates the viscosity average molecular weight of the sample to be 50000. The glass transition temperature of the product is detected to be 148.5 °C by dilatometer. The polycarbonate synthesized by the new method meets the quality requirements.
Preparation and application of low molecular weight polyether polycarboxylate superplasticizer
Authors: Liu Bobo , Ke Kuliang , Yang Yinggang , Miao Donghui , He Chong 
Published: February 2022

Abstract
In this paper, a low molecular weight polycarboxylate superplasticizer was designed and synthesized by using low molecular weight polyether macromonomer with molecular weight of 800 as the side chain of polycarboxylate superplasticizer; The ratio of oxidant and reductant in inorganic salt initiator system is 2:1, and that in organic water solvent initiator system is 4:1. The amount of initiator in the two systems accounts for 5% and 2% of the total amount of polyether macromonomer, respectively; GPC and Fourier transform infrared spectroscopy tests showed that the number average molecular weight of the water reducer was about 24000, the conversion rate of polyether macromonomer was more than 90%, and the molecular structure of the polymerization product met the design requirements. The influence of the polymer on the fluidity and bleeding rate of manufactured sand concrete is also discussed.