bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of Foreign Body Blockage in Water Cooling Wall on Flow and Heat Transfer
Authors: Yang Xianbiao , Wang Shutao , Liang Shaohua , Zhang Xidong 
Published: February 2023

Abstract
The ultra (super) critical units, as mainstream thermal power units, often need to participate in deep peak shaving. The variable load and high frequency peak regulation will lead to the partial increase of the temperature of the water-cooled wall and the phenomenon of local over-temperature. Aiming at this situation, the numerical investigation on the water-cooled wall of the #5 boiler in She-yang-gang was performed. The results show that the welding nodules and the foreign bodies in the water-cooled tube have a significant effect on the wall temperature. Moreover, with the increase of the blocking ratio (β), the mass flow in the tube decreases significantly, and the mass flow in the adjacent tubes rising. Further the increase of the mass flow is noteworthy in the nearest tubes. When the β of the target tube is higher than 0.4 the possibility of exceeding the maximum temperature limit of water-cooled wall tube material increases. The deposition of foreign body on the inner wall of the tube weakens the convective heat transfer between the inner wall and the fluid, which makes the wall temperature rise faster than other places. The more serious the deposition, the more obvious this phenomenon is.
Mixing Characteristics and Flow Fields Optimization of Primary Air for Coal Mill
Authors: Sheng Ranran 
Published: February 2023

Abstract
This paper mainly focuses on the problems of inaccurate measurement of the primary air flow rate in a coal-fired power plant. The feasibility of improving the uniformity of flow fields and temperature fields by installing double-layer arch cool air distributor and mixed flow matrix was analyzed by the method of numerical simulation. The results show that, the relative standard deviation of the wind speed measurement section of optimization model decreased from 18.7%~18.4% to 9%~9.1%, compared with the original model. Similarly, the relative standard deviation of temperature measurement section also decreased from 15%~14.6% to 1.3%~1.4%. The study suggests that this mixed flow fields equalization solution can effectively enhance the mixing of cool and hot primary air, and can improve the uniformity of the mixed air flow fields, thereby improving the accuracy and reliability of primary air measurement.
Degradation of Methyl Orange by Flower-like ZnO Synergistically with H2O2
Authors: Cai Yungao , Dong Yinghong , Sun Dejuan 
Published: February 2023

AbstractFlower-like ZnO was prepared by a simple microwave method, and characterized by XRD and SEM, PL. The photocatalytic analysis of methyl orange degradation by the flower-like ZnO was carried out, and the experiment was repeated. The XRD patterns confirmed that the product was wurtzite structured ZnO. Mercury lamp of 20 W was used to degrade methyl orange, the degradation efficiency was only about 4% after 320 min. Researched the effect of H2O2on photocatalytic performance, found degradation efficiency was more than 82% after 3 min, illustrated that H2O2had a strong role in promoting photocatalysis, organic compounds can be degraded by cooperative effort between flower-like ZnO and H2O2. The experimental results of the degradation of Methyl Orange by ZnO synergistically with H2O2show that the the degradation rat degradation of methyl orange by flower-like ZnO synergistically with H2O2is increased about 27 times, H2O2has a very good promoting effect on ZnO photocatalytic degradation of methyl orange. Finally, the mechanism of H2O2synergistic with flower-like ZnO degradation of methyl orange was analyzed.
Study on the Preparation of Special Wettability Nanofiber Membranes and Its Application in Oil-water Separation
Authors: Gao Di , Xin Binjie , Zhang Zhihao , Wang Yingwen , Yu WenJie , Hou Chao , Jiang Yuchen , Huang Peijun , Xu Wenjun 
Published: February 2023

Abstract
The effective separation of oily wastewater not only effectively avoids the environmental pollution problems caused by direct discharge, but also enables the recycling of oil and water resources, so the research of materials for separating oily wastewater is particularly important for saving resources and protecting the environment. Membrane separation technology is considered to be the most promising method for effective treatment of oily wastewater due to its flexible operation and high efficiency. Special wettability nanofiber membrane materials have superhydrophobic/superoleophilic or superhydrophilic/superoleophobic properties, which have led to widespread interest in the research of oil-water separation applications. This paper summarizes and concludes the application of different types of special infiltrative nanofiber membrane materials in the field of oil-water separation, points out the problems in the separation process, and finally gives an outlook on its future development direction.
Performance Comparison of PVA/SA Composite Hydrogels for 3D Printing of Cartilage Scaffolds with Different Compositions
Authors: Chai Weihong , Yang Rongbin , Zhou Jiayi , Wei Qinghua 
Published: February 2023

Abstract
Physical blend is the method always used to modify the properties of composite hydrogels for 3D printing in tissue engineering. In this paper, polyvinyl alcohol (PVA) blending with sodium alginate (SA) was applied to enhance the mechanical properties of SA. The PVA/SA blending hydrogels with different components (5:5, 4:6, 3:7, 2:8, 1:9, and 0:10) were prepared through cross-linking method, and their properties were studied from microstructure, mechanical property, hydrophilicity, and printability, so the optimal composition ratio of the composite hydrogel can be selected for 3D printing cartilage scaffold. Results show that with PVA increasing in composite hydrogel, the pore size of the composite hydrogel becomes smaller and more even. The tensile strength and toughness of PVA/SA hydrogels increased firstly and then decreased with the increase of PVA content, and the composite hydrogel of 2PVA/8AS has the best tensile strength. Moreover, the water content and printability of hydrogels decrease with the increase of PVA, which is in good agreement with the pore structures of hydrogels. Based on the above results, we believe that 8AS/2PVA blend hydrogel is the most suitable for 3D printing cartilage scaffolds.
Improving Tribological Behaviors of Invar 36 Alloy under Extremely Cryogenic and Dry Conditions Through Surface Micro-Texturing
Authors: Wang Bin , Guo Yanbao , Zhang Zheng , Wang Deguo 
Published: February 2023

Abstract
Invar 36 alloy is an iron-nickel alloy with an ultra-low coefficient of thermal expansion, which is widely used in cryogenic fields of liquefied natural gas (LNG) and aerospace. However, the wear under extremely cryogenic and dry conditions is a key problem for Invar 36 alloy applied in the bearing of cryogenic submersible pump. In this work, we are mainly for improving the cryogenic tribological performance of Invar 36 alloy through laser surface texturing. Three different types of surface micro-textures were prepared on Invar 36 alloy specimens. And the effects of these micro-textures on the friction and wear properties of Invar 36 alloy were investigated. The results show that groove-channel micro-texture has the lowest coefficient of friction and wear rate under normal and -196 °C. Further research shows that this is because the channel structure of groove-channel micro-texture is more conducive to the transfer of most debris generated caused by wear, which successfully reduces the occurrence of abrasive wear. Scanning Electron Microscopy/Energy-dispersive X-ray spectroscopy was utilized to explain the cryogenic tribological performance of the micro-textures.
The Production Practice of Ultra-pure and Ultra-low-carbon Stainless Steel 07Cr17Ni12Mo2 by LF-VOD+ESR Steelmaking Process
Authors: Jia Xiaobin , Tu Mingjin , Yin Ranran , Chen Liangxiao , Zhao Wuyunbilige , Guo Wenbin 
Published: February 2023

Abstract
By reasonably controlling the vacuum degree, oxygen supply intensity, oxygen lance position, and other process parameters of Vacuum Oxygen Decarburization (VOD) refining furnace (60t), and according to the blowing situation, combined with the oxygen concentration difference potential, exhaust gas temperature and CO concentration, accurately determine the blowing end point, and then further remove inclusions in steel by Electro-Slag Remelting (ESR), making the end point C less than or equal to 0.06 %, the total content of (As + Sn + Pb + Sb + Bi) is less than or equal to 150 ppm, total oxygen content is less than or equal to 30 ppm. The content of class A, B, C and D inclusions is less than or equal to grade 1.0 and the total inclusion grade is less than or equal to grade 2.0.
Effects of Cold Spraying Process and Diamond Addition on Microstructure and Thermal Conductivity of Copper Matrix Composites
Authors: Wu Dan , Zhang Linwei , Zhang Youliang , Zeng Yanqi , Hu Qiang , Liu Qi , Liu Jin , Jia Jingxuan , Zou Jin 
Published: February 2023

Abstract
The operation speed and integration degree of electronic components are getting higher and higher, which puts forward higher requirements for electronic packaging materials. Diamond is added to copper matrix composites to improve the thermal conductivity. The effects of cold spraying process and diamond addition on the microstructure and thermal conductivity of copper matrix composites are studied. The results show that the copper matrix composite prepared by cold spraying is a deformed strip copper layer. The change of cycle times has little effect on the microstructure, while the flattening rate of the deformed copper layer decreases as the carrier gas temperature increases. The diamond particles are uniformly distributed at the copper grain boundary after adding copper plated diamond powder, which are closely bound to the copper matrix. Increasing the temperature is conducive to increasing the thermal conductivity, while the change of cycle times has little effect on it. The addition of 20% diamond particles reduces the thermal conductivity, so the diamond content should be increased to play its role in thermal conductivity.
Study the Test Method of Temperature and Humidity Monitoring Equipment in the Cold Chain Transportation Process
Authors: Zhao Xia , Pei Lining , Jia Xin , Qu Meng , Zhang Zheng , Wang Yuanyuan 
Published: February 2023

Abstract
Transportation objects include food cold chain logistics, flower, plant cold chain logistics, chemical cold chain logistics and other cold chain logistics. In order to improve the overall performance of the temperature and humidity monitoring equipment in the cold chain process, and further promote and improve the regional metering service system. This study is to analyze its dewpoint temperature stability, relative humidity stability and temperature stability to evaluate the performance of the dew point instrument. The results showed that the standard deviation of temperature, humidity and dew-point in reproducible experiments are 0.00°C, 0.07%RH and 0.01°C. The standard deviation of temperature, humidity and dew-point in stability experiments are 0.02°C, 0.33%RH and 0.066°C. Results show that the measurement method of this experiment meets the requirements of the measurement standards.
Pulse Bag Filter Fault Classifier Research and Analysis
Authors: Ding Wenjie , Cao Yichao , Yu Kai , Ma Mingxue , Hong Bin 
Published: February 2023

Abstract
Aiming at the problem of fault alarm flooding, a fault classifier is established to automatically classify fault types in combination with unsupervised learning methods in machine learning. The k-means method is used to classify the alarm types in dimensionality reduction, and the optimal K value is selected as 11 through various evaluation indexes, and the faults are added to the new category labels according to the center of each cluster after clustering. The random forest and support vector classification algorithm is used to establish a fault classifier model on the fault alarm dataset with new labels, and the unified analysis of the fault type prediction results of the test set unlabeled fault data set is compared with the random forest algorithm, support vector classification, and k-means method. The results show that the unity rate of the prediction results of the three types of classifiers on the test set when taking different K values can reach up to 67%, and the uniformity rate of the prediction results of the three models exceeds 0.998, which has a high degree of uniformity, indicating that the establishment of the fault alarm classifier for the pulse bag dust collector is feasible and has good classification accuracy, which can help maintenance personnel quickly locate and troubleshoot faults, and improve the intelligence level of equipment.
Design of Micro Five-axis CNC Machine Tool and Research on Virtual Simulation Machining
Authors: Cao Xuyan , Li Bin 
Published: February 2023

Abstract
By studying the structure and functional characteristics of five-axis linkage CNC machine tool, design five-axis CNC machine tool with X, Y, Z linear motion axes, B and C rotation axes. The virtual simulation system of miniature five-axis machine tool is built based on the VERICT, and an impeller part was simulated and processed as an example. Check whether the state of each moving axis in the machine tool movement is correct, and judge the rationality of the structure design of the machine tool based on the error information such as interference and collision in the processing. It is proved by simulation that the machine can realize five-axis linkage machining within the design range and meet the design requirements.
Seismic Vulnerability Analysis of Continuous Beam Bridge Based on Multivariate Copula Function
Authors: Gao Wei , Cao Qing , He Haoxiang , Cheng Yang 
Published: February 2023

Abstract
To solve the problem of low accuracy caused by only a single typical component which is selected to represent the overall vulnerability in the traditional analysis, continuous beam bridge is assumed as a ternary system composed of pier, abutment bearing and pier bearing. The damage degree of corresponding components is quantified by pier end curvature or damage index based on elastic-plastic energy dissipation difference and bearing displacement, and then the vulnerability analysis of components is carried out. Multivariate Copula function was introduced. On the basis of calculating the vulnerability curve of the main components, the method to solving the seismic vulnerability of the ternary component system was established.
Sowing Machine for Scallop Seedling in Bottom-culture
Authors: Li Mingzhi , Lu Hongbo , Chen Haiquan , He Ruilin , Sun Yuqing 
Published: February 2023

Abstract
The scallop is among the most important shellfish resource and is a proven candidate for aquaculture in many countries. In China, the scallop is generally bottom culture and artificial seeding. Artificial seeding on scallops is a difficult process with low production efficiency, high labor intensity, excessive cost low profit, and high rate of mortality and damage. In this paper, a sowing machine is developed for the bottom-sowing culture of the scallop. It consists of a transmission module, sows slide module, and buoyancy module. The structure and working mechanism of this machine are presented and analyzed in detail. The tests of experiments were conducted as well with the development machine. Through the simulation analysis of flow field of bottom-sown machine. The results show that the vortex area below the platform makes the scallop seedlings seedlings spread more evenly. In addition, the boat-shaped fairing at the head of the platform effectively reduces the water flow rate inside the platform, allowing the scallop seedlings to successfully leave the platform through the grille at the bottom of the platform after sowing. The control group efficiency is 26.67%; however, the optimized group efficiency average value is 57.97%. The cost of bottom sowing 1t scallop seedling was reduced from 1260 RMB to 124.4 RMB. It is proven that the design of the machine is feasible.
Research on Intelligent Control Method for Radial Spinning Pressure Balance of Three-roller Spinning
Authors: Lu Bo , Huang Tao , Luo Wei , Ma Lijun , Ma Xiaoliang , Chen Hongwei , Ma Shuai , Zheng Hongwei , Wang Wendong 
Published: February 2023

Abstract
Aiming at the imbalance of radial force in the traditional spinning process, an intelligent control method for radial spinning pressure balance of three-roller spinning machine is proposed. Firstly, an indirect measurement method of spinning pressure is proposed. By measuring the pressure in the two chambers of the output oil cylinder, the pressure of the rollers is calculated. Using the electro-hydraulic servo closed-loop control principle, the intelligent control of spinning pressure can be accomplished in one cycle by changing the rolling reduction of the roller. Secondly, three intelligent control methods of radial spinning pressure balance, sequential control method, simultaneous control method and immediate control method are proposed. Three evaluation indexes of workpiece wall thickness, radial runout and ellipticity are adopted. Influence rule of three different intelligent control methods of radial spinning pressure balance on workpiece spinning dimensional accuracy are studied by the evaluation indexes. The results show that the three evaluation indexes using the radial spinning pressure balance intelligent control method are significantly improved compared with the evaluation indexes without the radial spinning pressure balance control method. The size and precision of the parts are the best by the sequential control method.
Relative Position of Plug and Die on Forming Accuracy of Shaped Tube by Cold Drawing
Authors: Li Wei , Liu Shengqiang , Feng Pengni , Zhou Jing , Wang Baoyu 
Published: February 2023

Abstract
In the actual industrial production and manufacturing, tube drawing plays an extremely important role. In this study, a device with adjustable relative plug position is designed, the influence of relative plug position on the dimensional accuracy and the drawing force of drawn tube was investigated. The results show that different relative plug positions affect the inner and outer surface dimensions of the tube respectively. Therefore, the relative plug position can be distinguished according to the following rules in industrial production. When the position of the plug relative to the die is backward, the outer surface dimension of the drawn tube is qualified but the inner surface dimension is unqualified. When the position of the plug relative to the die is forward, the inner surface dimension of the drawn tube is qualified but the outer surface dimension is unqualified. The relative position of the plug is mainly due to the different radial force given to the tube by the plug and the die, resulting in the unqualified size of the drawn tube. When the plug is positioned backward relative to the die, the tube is subjected to the radial force of the plug first and then the radial force of the die. When the plug is positioned forward relative to the die, the tube is subjected to the radial force of the die first and then the radial force of the plug.
Design and Analysis of a Single-sided Hook-type Structural Lock with Eccentric Wheel
Authors: Zou Kaisa , Ma Zhifei , Zhang Yu , Chen Chuanzhi 
Published: February 2023

AbstractIn order to reduce the lander load during the docking process during the docking of the manned lunar lander and the cruise, this paper designs and introduces a kind of unilateral hook type structural lock with eccentric wheel. This mechanism can reduce the quality of the lander docking device and achieve the technical requirements of locking and unlocking between the two spacecraft. Based on the mathematical model and three-dimensional entity model of the structural lock device, the motion law is solved and simulated by Matlab and Adams software respectively. Then the theoretical and simulated motion data are compared to verify that the modified structure lock can complete the established design requirements.
The Modified Cubature Kalman Filter for Relative Navigation of Space Target Tracking
Authors: Zhang Ai , Zhang Chao , Zhao Xin , Jiu Yuanwei , Li Jing , Huang Gang , Liang Fengchao 
Published: February 2023

Abstract
At present, the trend of improving the mobility of fast acquisition, long-term tracking and high-precision control has been formed in China. The continuous observation ability of non-cooperative targets and good imaging performance in motion are important trends in the development of optical remote sensing technology. Aiming at the high-precision observation and real-time tracking requirements of high orbit space satellites, this paper studies the high-precision relative navigation of space non cooperative targets. In order to solve the problem that the estimation accuracy of Cubature Kalman filter (CKF) decreases when the system visibility is low, a modified Cubature Kalman filter (MCKF) based on the visibility is proposed. This algorithm defines a system visibility characterization method based on the error gain matrix of the filtering process, and proposes the visibility scaling parameter based on this method, The filter gain covariance matrix is adjusted online, so that the algorithm can adjust the weight of state prediction and system observation online according to the observability of the current time. Numerical simulation shows that compared with CKF, the estimation accuracy of MCKF is improved by about 4 times, and MCKF stabilizes faster and has higher accuracy.
Research on Registration Accuracy Detection Method Based on Machine Vision
Authors: Li Jialin , Wu Shuqin , Chang Kun , Wang Jia 
Published: February 2023

Abstract
The online printing machine registration control system can detect the overprint accuracy in real time during the printing process, so as to adjust the corresponding equipment to improve the print quality. The off-line overprint accuracy detection system ensures the stability and reliability of the detection results when detecting the print quality. Under this background, the research and experiment on the algorithm model of overprint accuracy detection of color prints based on machine vision system are carried out. Set up a hardware platform for printing registration accuracy detection with perfect machine vision, complete the collection of registration logo images. Convert the collected graphic sample information into data that can be processed by the computer. The collected image samples can be processed through the corresponding functions of the software platform interface, including graphic segmentation, visual enhancement, filtering and noise reduction, and edge extraction. Finally, the registration accuracy detection is completed through the neural network model for experimental analysis.
Control of Quadrotor Based on RBF Neural Network Adaptive Fast Terminal Sliding-Mode Strategy
Authors: Luo Huan , Zhang Song 
Published: February 2023

Abstract
I The purpose of this paper is to propose a fast adaptive terminal sliding mode control method for quadrotor unmanned aerial vehicles (UAVs) under dynamic uncertainties and external interference. Firstly, a complete mathematical dynamics model of a quadrotor UAV is presented. Secondly, a robust dual-loop nonlinear control law for the quadrotor velocity and attitude tracking is designed. Through the introduction of equivalent control inputs, the attitude control channels can be decoupled and attitude stabilized controllers can be designed separately. For velocity tracking and altitude tracking control, coupled controllers are designed to ensure velocity tracking based on the stability of altitude tracking control. The attitude loop adopts RBF neural network sliding mode control, to compensate for model disturbance uncertainty, adjust its gain in real time, and suppress chattering problems. Finally, the experimental results show that the designed controller can not only suppress external interference, but also achieve accurate tracking of the desired flight command.