bluuebunny/crossref_metadata_2025_split huggingface dataset:
Fault diagnosis of DC-DC module of V2G charging pile based on Fuzzy Neural Network
Authors: Wang Qunfei , Lu Xiaoli , Yang Dongjunming 
Published: May 2021

Abstract
Aiming at the problem of fault diagnosis of switching devices in DC/DC module of V2G charging pile, a diagnosis method based on fuzzy neural network is proposed. The method combines fuzzy mathematics with neural network, adopts 4-layer forward network and a step degree optimization algorithm, uses the self-learning and self-adaptive ability of neural network, adjusts the parameters of fuzzy set membership function in real-time, and trains a set suitable for V2G charging Fault diagnosis algorithm of DC/DC module of electric pile. Simulation results show that the fault diagnosis algorithm based on fuzzy neural network can effectively diagnose faults.
Development of Helium Direct Current Discharge Ultraviolet Light Source
Authors: Shi Xiaoqian , Zhu Meiqiang , Zhan Zhaokang , Zang Kan , Dong Huajun , Guo Fangzhun 
Published: May 2021

Abstract
Ultra-violet (UV) light source is one of the important components of ultraviolet photoelectron spectroscopy (UPS). A Helium direct current discharge ultraviolet light source is mainly composed of anode, quartz capillary, gas inlet pipe, differential exhaust assembly and heat sink. At 80Pa working pressure and 30mA discharge current, the test sample shows 1nA photoelectron current. Photoelectron current increases proportional with discharge current. The results show that the He DCDUV light source is working well and can be used as the light source in UPS.
Multi-Objective Optimization of the Vuilleumier Heat Pump under Adiabatic Condition
Authors: Xie Yingbai , Zhang Mengtao 
Published: May 2021

Abstract
The Vuilleumier cycle adiabatic model has complex calculations and numerous structural parameters. In order to facilitate the analysis and optimization of the structural parameters of the adiabatic model, a dimensionless method is adopted, a system of dimensionless differential equations containing 7 dimensionless parameters is obtained. Among the 7 dimensionless parameters, 5 dimensionless structural parameters representing the volume structure characteristics of the system are selected as decision variables in the optimization. The non-dominated sorted genetic algorithm-II is used for multi-objective optimization with heating capacity and COP as the target parameters. Finally, the Pareto front was obtained, and the baseline case was optimized using the TOPSIS method. After optimization, the heating capacity and COP increased by 0.701 % and 0.848 %, respectively.
Standard Heat Consumption Modelling Calculation and Operation Optimization of Boiler Steam Temperature System
Authors: Li Fengping , Yuan Jun , Chen Jiayi , Zhang Kailiang 
Published: May 2021

Abstract
The combination of neural network and genetic algorithm not only can improve the operating efficiency and economy of the boiler, but also give the recommended values of the operating parameters. Based on the power plant, the number of hidden layers, nodes and learning rate of the neural network modelling calculation are determined according to the data experiments. Taking the standard heat consumption as the target value, the adjustable and non-adjustable quantities of the input parameters are analysed, the parameters such as the crossover rate, the mutation rate and the GGAP suitable for the research object are selected, and the genetic algorithm is used for optimization. The results show that the standard heat consumptions of all the 100 groups of working conditions are reduced. The average reduction is 153.93 kJ/(kW•h). This indicates that by modelling and optimizing the parameters such as the superheater desuperheating water flow, it can provide operational guidance for actual production.
Research on Heat Dissipation of Diode Laser Array with Sharp-angle Sink
Authors: Zhao Shuyun , Xu Huiwu , Li Dezhen , Yan Lihua , Li Zhaoyi , Li Xianjie 
Published: May 2021

Abstract
The project is designed and analyzed for the heat sink of the semiconductor laser array, and the heat dissipation performance of the heat sink with a sharp-angled channel is simulated by the finite element method. The results show that: compared with the traditional cylindrical cavity, the sharp-angle shape cavity has a stronger heat dissipation capacity. By designing a gradual flow channel inlet and outlet size, the flow channel inlet and outlet two of the large-size and multi-bar array laser are significantly reduced. The chip junction temperature difference at the end makes the array chip wavelength difference controlled within 1.9nm, which effectively improves the absorption uniformity and efficiency of the Nd:YAG crystal in this type of pump module.
Signal Simulation and Test of Cadmium Zinc Telluride Nuclear Radiation Detector
Authors: Chen Yunfei , Zhang Jijun , Wang Linjun , Wang Shulei , Yang Yang 
Published: May 2021

Abstract
In the research and development of nuclear instruments, the simulation and shaping of nuclear pulse signals are very important. Since the output signal of nuclear detectors is very weak and has noise interference, it cannot be processed well by the data acquisition system, so it is necessary to filter and shape the nuclear pulse signals. Using MATLAB 2019a simulation software to superimpose random noise to simulate the output signal of the CdZnTe nuclear radiation detector, the output signal of the preamplifier and the output signal of the main amplifier. The final result is basically the same as the actual signal, which is a simulated nuclear pulse signal, laying the foundation for the nuclear-simulated pulse signal generator.
Design of Single Anti-Reflection Film for High Power Semiconductor Laser Facet
Authors: Xu Huiwu , Li Xianjie , Yan Lihua 
Published: May 2021

Abstract
The catastrophic optical damage (COD) threshold of high power semiconductor laser chip is very important in its application. In this paper, based on the transfer matrix calculation method, a coating model is established to explain the relationship between the design parameters and COD threshold. The influence of the refractive index of the film in the whole range between Air and GaAs medium is analyzed. The influence of the refractive index in the range of 1.1 ~ 3.3 on the reflectivity of the film and on the COD threshold are theoretically simulated. The simulation results show that in the design of actual coating parameters, not only the reasonable PC value, but also the requirement of reducing reflectivity and the trade-off between reflectivity and PC value should be considered. In addition, the possible refractive index parameters of the film, the reflectivity of the corresponding film and the corresponding PC value are reflected in the simulation diagram. This paper provides ideas for the improvement of COD threshold and the reliability of chip facet.
Research and application of cave slag tailings in concrete
Authors: Rao Qi , Zhang Hengchun , Wan Rui , Xi Shuiping , Wu Dianxing , Luo Chunyang 
Published: May 2021

Abstract
This article starts with the characteristics of cave slag tailings, proposes to optimize the quality of the concrete production process and product structure by improving the composition of concrete fine aggregates, and conducts research on the key technologies of the application of cave slag tailings to concrete. Concrete quality and economic cost are the basic frameworks, and the feasibility of using cave slag tailings is comprehensively analyzed. It has been verified by experiments that the application of cave slag tailings can greatly improve the stability of concrete production process, reduce concrete structural defects and quality disputes caused by process control, and can significantly reduce the cost of single main material of concrete and bring good Economic benefits. At present, the slag tailings of the cave have been widely used in the resettlement houses of Houyu, Minhou, the MIXC# building, TA# building and its basement of the fourth phase of Fuzhou China Resources Vientiane City, and all performances have reached the engineering design requirements.
Measurement of CO2 hydrate phase change heat for renewable energy application of biogas
Authors: Li Juan , Xia Xinliang , Liu Changming , Tang Nong 
Published: May 2021

Abstract
Biogas is a renewable clean energy produced by decaying organic matter and its main components are methane and CO2, in which CO2 accounts for 25%~40% (volumetric percentage). The storage and transportation of biogas by hydrate method has attracted wide attention at home and abroad. In this paper, the phase equilibrium conditions for the hydrates in CO2, CO2-THF (tetrahydrofuran) and CO2-cyclopentane systems are researched to determine the phase transition heat of the hydrates of corresponding systems. The results illustrate that the phase transition heat of hydrate is related to the structure formed during experiments. Adding THF and cyclopentane into CO2 hydration system both increases the phase transition heat of hydrate. Phase transition heat of the CO2-THF hydration system increases with the increase of the mass concentration of THF, and the phase transition heat of CO2- cyclopentane hydration system is greater than 200kJ/kg. Results in this paper will be helpful for transportation and utilization of biogas as an renewable clean energy.
Abnormal Detection System Design of Charging Pile Based on Machine Learning
Authors: Li Yanjie , Ji Xiaoyu , Jiang Dongxiao , Meng Tao 
Published: May 2021

Abstract
With the exhaustion of fossil energy and people’s increasing attention to environmental protection, electric vehicles began to be popularized around the world. As an important infrastructure, the EV charging network is faced with the risk of a series of network attacks, which may cause economic losses to the power grid and car owners, and even endanger the stable operation of the power grid. In order to solve the security problem of charging piles, we designed an abnormal detection system for charging piles based on the power consumption side channel and machine learning. By collecting power consumption information of the charging control unit of charging piles, the abnormal detection system determines whether charging piles are facing attacks or not. We have verified three kinds of attacks, proving that our anomaly detection system can effectively detect attacks and protect the security and stable operation of charging piles.
Characterization on microstructure of interface and failure analysis of SiC fiber reinforced Ti-17 composites under tension load
Authors: Zhao Wenxia , Ciuca Octav. , Yang Xiaoguang , Tao Chunhu , Zhou Xiaorong , Liu Changkui 
Published: May 2021

Abstract
In this study, the ultimate tensile strength of unidirectional SiC-fiber/Ti-17 composites was measured in the as-produced condition at room temperature. Fracture and interfacial reaction zone was characterized by using laser confocal microscopy, field emission scanning electron microscopy (FE-SEM) and transmission electron microscopy. Elemental distribution maps of the interfacial reaction layer and titanium matrix were quantitatively examined by electron probe micro-analyzer (EPMA). Micromechanical properties of SiC fiber and titanium matrix was inspected by Nano-indentation. The Fracture failure mechanisms was show that the key microstructural parameters which dominate damage initiation, damage growth and fracture behavior of the composites were explained in detail.
Water-based double layer coating transfer aluminum-plated paper material in the application
Authors: Pan Ruru , Yao Pingzhang , Yu Lin , Fang Xiling 
Published: May 2021

Abstract
This paper introduces a new type of moisturizing paper, which makes the material have a stronger moisturizing effect than ordinary transfer paper through the water-based double-layer coating process. At the same time, the paper has a stronger degradation capacity than plastic film paper, more in line with environmental protection requirements. Through the paper printing machine adaptability verification, the paper has easier processing and stronger printing performance. The development and application of this moistening material is a major innovation in the field of moistening packaging materials research.
Simulation Study of Magnetic Shielding to Address Heat Generation in Rollers for Clamping Aluminum Rod Heated by HTS DC Induction Heater
Authors: Hu Lei , Yan Xufeng , Dai Shaotao , Ma Tao 
Published: May 2021

Abstract
The roller is the connect structure between the gripper and main or auxiliary gearbox, which rotates simultaneously with the aluminum billet. When preheating short aluminum billet, a part of the roller is in the air-gap, which will be heated during preheating the aluminum billet, and the increase in the temperature of the roller can affect the gearbox. To address the roller heat, a magnetic shielding method has been proposed. And the effect of the magnetic shielding of the magnetic field in the roller and the air-gap has been analyzed. The weakening effect of the magnetic shielding on the heating power also has been evaluated. At the same time, the electromagnetic force of the magnetic shielding is also been carried out. The results show that the magnetic shielding can effectively reduce the heating power of the roller. Evidently, adding a magnetic shielding around the roller is feasible to alleviate or solve the problem of roller and gripper heat.
The Effects of Different Splitter Blades Number on Characteristics of Miniature Super-Low Specific Speed Centrifugal Pump
Authors: Zhong Wenqing , Zhou Jin , Zhou Shaoping 
Published: May 2021

Abstract
Splitter blades are often used to improve the performance parameters of super-low specific speed centrifugal pumps, while the number of splitter blades is the most important influencing factor of head and efficiency. In order to study the effect of different number of splitter blades between long blades on the external characteristics and internal flow field of centrifugal pumps, the numerical simulation of four impeller models has been carried out by Fluent. The results show that splitter blades can raise head and efficiency of the centrifugal pump, so that the performance curve moves toward large flow rate area. The low speed area on the pressure surface of the long blade reduces with the slip and separation inhibited. When the number of splitter blades increase gradually, the head of the centrifugal pump has not much increase while the efficiency decreases. Most of the medium flow out through the runner on the pressure surface leaving the others blockage due to the backflow and vortexes, resulting in large hydraulic loss.
A new analytical model for the growth rate of dendrite tips
Authors: Ao Xiaohui , Xia Huanxiong , Liu Jianhua , He Qiyang , Lin Shengxiang 
Published: May 2021

Abstract
It’s well known that the driving forces of dendrite growth in metal solidification typically include temperature undercooling, constitutional undercooling, and curvature undercooling, and these undercoolings are usually computed independently by their corresponding local temperature, concentration, and curvature in a model. This paper derived a new formula only depending on the temperature undercooling based on the dynamic equilibrium relationship and the Ivantsov function for computing the growth rate of dendrite tips at the equilibrium state. By taking the derivative of this formula to find the maximum growth rate, an almost constant ratio of the curvature undercooling to the temperature undercooling was found, specifically, the ratio is in the range of 0.507 to 0.524 corresponding to the temperature undercooling of 4 to 10 K. The analytical result was validated by the numerical simulations of the solidification of Inconel 718 alloy with different temperature undercoolings by using a cellular-automata mothed. The numerical results suggested a ratio of 2/3 of the curvature undercooling to the temperature undercooling for the given Inconel 718 alloy.
Experimental Study on the Dimension Error of Bridged Structures Printed by Fused Deposition Modeling
Authors: Yang Chun , Liu Jianhua , Ao Xiaohui , Xia Huanxiong 
Published: May 2021

Abstract
Fused deposition modeling, a popular additive manufacturing technology by extruding thermoplastic materials, can be used to print structural parts with complex geometries. However, when a part appears an overhanging structure, it is usually necessary to add an auxiliary support structure. The added structure not only causes material waste but also secondary damage to the printed part owing to removing the support structure in post-processing. To understand the dimension error of bridged structures without support structures, this paper experimentally investigated the effects of the bridging span, layer thickness, nozzle speed and temperature on the sagging deformation of the bridged structures. The limitation of bridging span and the sensitivities of the printing parameters were found.
Forming Control of Rod-Shaped Tantalum-Tungsten Alloy Explosively Formed Projectile
Authors: Xue Weizhao , Li Mei , Men Jianbing , Jiang Jianwei , Wang Shuyou 
Published: May 2021

Abstract
In order to obtain the charge structure of rod-shaped tantalum-tungsten alloy (Ta-W) explosively formed projectile (EFP) with good performance indicators, the LS-DYNA numerical simulation software was used to study the arc-cone liner different charge structure parameters (such as curvature radius, half cone angle and thickness of liner, charge height and shell thickness) on the forming of Ta-W EFP so that the optimal range of each structural parameter was determined. The primary and secondary order of the influence of various structural parameters on the forming performance of Ta-W EFP was obtained by orthogonal optimization design, and the optimized plan of rod-shaped Ta-W EFP was determined (curvature radius of liner is 1.16071D, half cone angle of liner is 68.5°, thickness of liner is 0.02054D, charge height is 0.85714D and shell thickness is 0.08929D, where D is charge diameter). The results show that the performance indicators of the optimized plan of rod-shaped Ta-W EFP are better, whose velocity is 2312m/s, length-to-diameter ratio is 4.41998, compactness is 0.95929 and necking ratio is 0.21109.
Effect of initial temperature and initial pressure on the lower explosion limit of aviation kerosene
Authors: Ning Yongqian , Zhang Liang , Wang Zhi , Ning Xiaoyao , Wang Jian 
Published: May 2021

Abstract
The effect of initial temperature and initial pressure on lower explosion limit (LEL) of RP-3 aviation kerosene vapor was investigated experimentally. The experiments were conducted in an explosion limit equipment at initial temperature of 40-160 °C and initial pressure 100-160 kPa. In the temperature-pressure range studied, the LEL decreases with the increase of the initial temperature, while increases as the initial pressure increases. A correlation formula established in the present study can predict the experimental data well. A comparison of the temperature dependence and pressure dependence indicates that the LEL of RP-3 aviation kerosene vapor is mainly affected by the initial temperature. This guides people to pay more attention to the aspect of the heat transfer in the fuel tank of aircrafts avoiding the explosion risk caused by high temperature.
Combined oxidative degradation of ammonia and phenol by homogeneous UV/S2O8
2- process
Authors: Yang Yuke , Wen Zhiguo 
Published: May 2021

Abstract
Utilization of UV in peroxydisulfate (S2O8
2-) activation exhibits a potential for removing contaminants in wastewater. In this study, the oxidative degradation of aqueous ammonia (NH3/NH4
+) or/and phenol by UV/S2O8
2- process was investigated, including the kinetic model of ammonia removal, the effect of pH on degradation efficiency and TOC removal, and influence of S2O8
2- concentrations on contaminants removal. The results revealed that the kinetic model of ammonia removal conforms to pseudo-first-order. Strong alkaline conditions and high dosage of S2O8
2- were profited to ammonia degradation, and the removal percent was up to 95.98% (e.g. 50 mM S2O8
2- at pH 12). The near-neutral environment was conducive to phenol removal, and its maximal removal percent was 96.28% in 30 min at pH 8. In the combined oxidation system of ammonia and phenol, the ammonia removal quickly reached 40.90% in 30 min and got its maximum of 55.20% after 8 h, while the phenol degradation had almost no obvious decline. This study enriches our understanding of the oxidation kinetic of ammonia under UV, and provides new insights for combined oxidation of ammonia and phenol.
Microstructure and fatigue properties of TC4 titanium alloy treated by α+β forging process
Authors: Cui Wenbin , Chen Xuan , Cheng Li , Ding Junliang , Wang Changkai , Wang Bohan 
Published: May 2021

Abstract
As aero engine life increases, blade fatigue has become one of the key factors restricting the high reliability and long service life of aero engine. In this paper, TC4 bar was treated by α+β forging process. The microstructure and mechanical properties of the treated material were observed and tested at room temperature, and the three point bending ultrasonic fatigue test was carried out. The results show that the S-N curve of the α+β forging material presents a double platform shape. The high cycle showed surface cleavage mode, the very high cycle showed internal cleavage mode, and the very high cycle cracks originated from the primary phase cleavage plane.
Two synthetic strategies of (S)-3,3′-bis(azidomethyl)-2,2′-bis(methoxymethyl)-1,1′-binaphthalene
Authors: Shi Huizhong , Wu Changzhi , Huang Yan , Fu Muyun , Wang Huizhen , Zhang Yafeng , Sun Xiaoxia 
Published: May 2021

Abstract
Different effective synthetic strategies of chiral intermediate (S)-3,3′-bis(azidomethyl)-2,2′-bis(methoxymethyl)-1,1′-binaphthalene are described from the original material (S)-3,3′-bis(hydroxymethyl)-2,2′-bis(methoxymethyl)-1,1′-binaphol. The 1HNMR and HRMS spectroscopic analyses have been used to confirm the synthesis of (S)-6.
Operation Characteristic Analysis and Parameter Optimization of District Heating Network with Double Heat Sources
Authors: Zhao Junhong , Li Ying , Li Jingyi , Li Zhi 
Published: May 2021

Abstract
The heating system is a practical engineering problem with multi-parameter coupling and multi-constraint restrictions. The use of optimization algorithms has guiding significance for its high efficiency and energy saving. This paper takes the district heating pipe network with dual heat sources as an example to analyze the operation characteristics of the heating pipe network and optimize its parameters. The thermodynamic model of the dual-heat source district heating pipe network is established, and the NSGA-II algorithm is applied to analyze the operating characteristics. By comparing the upper and lower limits of the interval and the interval when the pipe length and pipe diameter are the decision variables, it is believed that to reduce the loss during the operation phase of the system, quantity adjustment should be avoided as much as possible. The water supply temperature is greater than 95°C, the greater the system fluctuation. Through the NSGA-II algorithm, the Pareto front is obtained, and the TOPSIS optimization method is used to finally obtain the best operating parameters of the pipe network with the best closeness.