bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chain-Length Induced Structural Polymorphism for two-dimension self-assembly
Authors: Xu Li , Cheng Xuxin 
Published: March 2023

Abstract
Structural polymorphism obtained through the 2D self-assembly which was made use of the chain-ength induced, has has aroused wide concern. On the one hand, owing to its significance meaning in crystal engineering, on the other hand, it has a broad application prospect in nano science and technolog.The assembly of symmetric 2, 7-bis (n-alkoxy) -9-fluorenone(F-OCn) with varying lengths of peripheral alkyl chains dissolved in homologous acids was investigated. The size and shape of molecules and the structure and position of substituents were critical factors that regulate the equilibrium of the interaction and formation of self-assembled patterns. Useing altered the symmetry and chain-length of the molecular structure, the self-assembly morphology and cellular properties can be predicted. The self-assembled strcture displayed the assembly of F-OCn (11-14). “S” shaped and alternating phases are the thermodynamic stable states. The competition between van der Waals forces from the interdigital alkyl chains and van der Waals forces between molecule-substrate takes effect. The vdW forces between the molecule-substrate was predominant when n varies from 15 to 18. The observation of the chain-length effects and odd-even effects showed that: F-OCeven developed from a loose-and close-packed patterns to a dislocated zigzag patterns.Self-assembled morphology of F-OCodd evolved from a well-distributed trimer monolayer to the dislocated zigzag pattern.These researches offers insight into the structural diversity by regulating the alkyl side chain-length and odd-even effects on two-dimension self-assembly and the construct a new molecular materials.
Parameterization investigation on distributed electric propulsion aircraft aerodynamic characteristics
Authors: Cheng ZhiYong , Yang YouXu , Ye Bo 
Published: March 2023

Abstract
Revealing the principle of distributed electric propulsion (DEP) plane aerodynamic design under the effect of strong aerodynamic coupling of distributed power-wing and the change law of total gain is the key to carrying out the design of distributed electric propulsion plane. For the distributed electric propulsion plane aerodynamic layout, the aerodynamic performance of the DEP configuration is studied based on the VLM-ADT aerodynamic characteristics fast solver method. This paper gives a set of fast parametric methods to research the aerodynamic performance of DEP layout, which mainly includes three comprehensive indexes such as lift-to-drag ratio L/D, power loading T/P, and lift loading L/P—focused on; the factor of propeller number, which affects the aerodynamic performance of DEP aerodynamic layout. As the propeller number increases, the lift-to-drag ratio decreases, but the wing’s lift efficiency increases.
Study on warpage deformation of micro extrusion 3D Printing Bone Tissue Engineering Scaffold and Its Optimization Method
Authors: Ren Xiaoxiang , Yang Zhenda 
Published: March 2023

Abstract
Spinal degeneration is a major disease that affects human health. Titanium alloy, PECK, and other nondegradable materials are currently used in interbody fusion cages. It is important to develop a biodegradable biomaterial. Taking the warpage analysis in micro extrusion 3D printing of tricalcium phosphate (TCP) and polycaprolactone (PCL) mixed materials as an example, the theoretical model of 3D printing part deformation is established and studied, the influence of different stress resultant forces on warpage is analyzed. The influence of layer height, ambient temperature, and other process parameters on the warpage of the finished product is quantitatively analyzed. It is proposed to increase the printing temperature appropriately and print layer thickness. The printing warpage can be reduced by reducing the end face length.
Study on the method for detecting contact state of bolted joint surface based on laser ultrasonic
Authors: Hao Bin , Tao YuLong , Yi Hongzhen 
Published: March 2023

Abstract
The contact state of the bolt joint surface has an important influence on the contact stiffness, damping, and other properties of the equipment. To obtain the contact state of the bolt joint surface, the method to detect the contact state of the bolt joint surface based on laser ultrasonic technology is proposed in this paper. The reflectivity under different working conditions is obtained by the reflection amplitude of the longitudinal wave before and after bolt tightening. The relationship between reflectivity and bolt torque is studied. The results show methods proposed in this paper can effectively detect the contact state of the bolt joint surface, and it provides a basis for the study of the mechanical properties of the contact surface.
Numerical study of the mixing of micron particles in a vane mixer
Authors: Lv Junmeng , Chen Siwei , Jin Yu , Huang Zhiwei 
Published: March 2023

Abstract
As the research and application of micron particles are intensified, higher requirements for continuous flow mixing of multiple micron particles have been put forward. This study is based on rotating blades in the flow field to generate a vortex through which various micron particles are mixed. The particle mixing device designed in this study has a simple structure and small size advantages. The particle mixing model for coupled flow field study is established by using the finite element analysis method to realize the study of multiple micron particle mixing. The effects of blade shape, blade size, blade rotation speed, and inlet particle entry interval on the mixing impact are analyzed in the study. In this study, the factors affecting the particle mixing effect were analyzed by counting the number of outlet particles and plotting the flow lines in the mixing chamber. Optimization of the mixer scheme based on the influencing factors obtained from the study resulted in a high mixing effect of the designed particle mixer, which can provide a significant reference value for the subsequent micron particle mixing scheme design.
Investigation on failure of 35Cr45Ni steel at high temperature
Authors: Yang Chao , Han Qing , Liu Haibo , Ju Zichen , Wang Yuanyuan 
Published: March 2023

Abstract
The 35Cr45Ni steel with the high service temperature of about 1150°C was wildly used in ethylene pyrolysis device. However, the structure of 35Cr45Ni steel will change greatly after it was in service for a long time at high temperature. Therefore, in this paper, focusing on the 35Cr45Ni furnace tubes with different service time (0 and 6 years, i.e. original sample and failed sample), the microscopic morphology and elemental composition analysis were carried out to determine its failure behaviour. The results showed that the fracture morphology of the failed tube was mainly characterized by intergranular cracking, and there were carbides on the local surface of the crack, which was brittle cracking at low temperature. The precipitated phase in original 35Cr45Ni steel was mainly austenitic, M7C3 carbide and MC carbides. In a long-time service at 1000°C, the transformation of M7C3→M23C5 and MC(NbC)→Nb3Ni2Si occurred, and dispersed secondary M23C6 carbide was precipitated in the grain. Additionally, The NbC→Nb3Ni2Si transformation promoted the M7C3 to M23C5 process and the carbide precipitation as well as coarsening.
Effect of joint-extrusion-force on the plasticity of beam oscillation fiber laser welded X2CrTiNb18 ferritic corrosion resisting steels
Authors: Zhang Qiushi , Chi Hongcheng , Zhang Hong , Liu Fengde 
Published: March 2023

Abstract
The effect of extrusion force on the microstructure and plasticity of the X2CrTiNb18 ferritic corrosion resisting steels joints which were welded by beam oscillation laser welding was studied. The cross section profile of welded joint beam oscillating fiber laser welding & extrusion (OLW&E) was similar to that of the beam oscillation laser welding (OLW), but the weld width of OLW&E was slightly narrow. The differences of microstructure between them were very obvious. In the OLW&E weld zone (WZ), on the one hand, the quantity of small grains increased obviously, and on the other hand they grew in a staggered state. In the plastic forming process, the deformation compatibility of welded joints was significantly improved, and its plasticity was increased by 21%.
Displacement Control and Simulation Based on A Hybrid Magnetic Bearing Model
Authors: Zheng Yan , Sun Jiyuan , Li Pin 
Published: March 2023

Abstract
The mechanical structure of a hybrid magnetic bearing contains both a permanent magnet and electromagnet, besides, its magnetic force form is relatively complex. The installation deviation of the sensor, processing quality, and other factors will make the actual working position of the magnetic bearing deviate from the rated balance position when it is stably suspended. This situation affects the working efficiency of magnetic bearings. This paper takes a magnetic levitation structure as the research object, and obtains the single-end magnetic force of the structure from electromagnetics-related knowledge. From the mechanical point of view, the detailed force formula of the system is obtained. The control system is designed by combining fuzzy control with PID control, and the performance of the two control methods is compared. In this paper, based on a hybrid magnetic bearing model, its mathematical model is obtained through electromagnetics and other related formulas, and PID and fuzzy PID algorithms are designed and simulated
Research on Fast Homing Method in Automatic Production Line
Authors: Wang Hai , Li Yanjuan 
Published: March 2023

Abstract
Homing is a particularly important step to establish the equipment coordinate origin. A reliable method of fast homing based on the PLC system in the automatic production line is discussed, which obtains the position information of each motion axis through Modbus or other networks, and cooperates with PLC’s Homing instruction to static home quickly to avoid complex operations. And the function of returning to the breakpoint in the middle process is proposed, which makes it easy to resume production in the event of power failure or overload, and greatly improves production efficiency. And the above research is transformed into a practical system, which has been verified and has the value of promotion.
Research on Intelligent Fault Diagnosis Method of Automation Equipment Based on EMD-ISVM
Authors: Cheng Junkai , Zhang Yangyang 
Published: March 2023

Abstract
Bearing plays an important role in automation equipment in many fields, such as industry, transportation, and national defense. An intelligent fault diagnosis method for rotating machinery based on EMD-ISVM is proposed to improve the diagnostic accuracy of typical bearing faults. Firstly, the vibration signal is decomposed into multiple IMF components through the adaptability of empirical mode decomposition. Then the IMF components containing effective state information are selected to reconstruct the signal to reduce noise. Then, the fault feature set is formed by extracting multiple features of the reconstructed signal that can represent the machine’s running state. Finally, the global optimization ability of FOA is used to optimize the parameters of SVM and to improve the ability of SVM to identify fault modes. The bearing experiment results verify the effectiveness of the proposed method, which has a certain reference significance for fault diagnosis of other key components of automation equipment.
Research on Drag Reduction and Heat Prevention of Hypersonic Vehicle Combined Model with Reverse Jet and Slot Blowing
Authors: Ni Zi-jian , Fang Shu-zhou , Guo Jian , Wang Zi-yu 
Published: March 2023

Abstract
A novel strategy combining reverse jet with slotted blowing is proposed in this paper, and two-dimensional (RANS) is used to numerically investigate the flow characteristics of a reverse jet. The numerical results show the jet from the aircraft head ejects backward, pushing the shock away and reducing aerodynamic heating and shock wave resistance. The jet from the middle slot ejects backward and the effective solution reduces the viscous resistance of the fuselage. This new strategy not only further reduces the total resistance but also provides good thermal protection for the aircraft. Compared with the aircraft model, the stagnation point temperature and resistance are reduced by 25.0% and 28.0%, respectively, with the addition of multiple jets.
Design and research of energy supplement system for ocean buoy
Authors: Fang Zifan , Zhao Shuang , Zhang Liming , Zuo Xinqiu , Yang Yanli 
Published: March 2023

Abstract
Aiming at the problem of energy supplements for ocean buoys, an energy supplement system for ocean buoys is designed. The buoy shakes under the action of waves, and the energy supplement system located in the buoy collects ocean kinetic energy and converts it into stable electric energy for buoy power supplement or storage. The working principle, design schemes, and structural composition of the ocean buoy energy supplement system are determined. According to the motion principle of the shaking pendulum, the system torque equation is established. AQWA is used to simulate the motion characteristics of the floater under the first level of regular and irregular waves, and the roll angle displacement of the floater is taken as the input of the simulation model. The joint simulation of Adams and AMESim is used to build the electromechanical coupling simulation model of the system, which verifies the rationality of the design scheme. The results show that 3.3 V and 1 A DC can be generated under the action of first-order regular wave and irregular wave, and stable power output can be achieved to supplement the buoy or charge the battery.
Research on Fast Frequency Response Control of PV Power Stations
Authors: Li Hua , Li Xu-dong , Han Xiang , Chen Zhiqiang 
Published: March 2023

Abstract
In this paper, the frequency support capacity of power system integrated by A large number of PV generation is considered. Based on the conventional inverter PQ control strategy, virtual droop control and inertia control are introduced, and a fast frequency response control strategy of PV inverter similar to the synchronous generator is proposed. Meanwhile, in simulation software of power system, a three-machine nine-node simulation model including the PV power station is established, and the simulation verification is carried out. The simulation results show that when the system is disturbed, PV station can actively provide frequency regulation and enhance frequency stability of the power system.
Research on DC Power Supply for Electrolytic Water to Hydrogen Based on Renewable Energy
Authors: Zhou Jinghua , Meng Xiangfei , Chen Yaai 
Published: March 2023

Abstract
Hydrogen production from electrolytic water based on Renewable Energy has been found as a vital method for the local consumption of new energy and the utilization of hydrogen energy. In this paper, the hydrogen production power supply matching the working characteristics of electrolytic water production was investigated. Through the analysis of the correlation between the electrolysis current and temperature of the proton exchange membrane electrolyzer and the electrolyzer port voltage, energy efficiency, and hydrogen production speed, it was concluded that the hydrogen production power supply should be characterized by low output current ripple, high output current, and wide range voltage output. To meet the requirements of the system of hydrogen production from electrolytic water based on new energy, a hydrogen production power supply scheme was proposed based on Y which is the type three, is the phase staggered parallel LLC topology. In the proposed scheme, the cavity with three is the phase staggered parallel output is resonated to meet the operating characteristics (high current and low ripple) of the electrolyzer, and pulse frequency control is adopted to achieve resonant soft in the switching operation and increase conversion efficiency. Lastly, a simulation model and a 6kW experimental prototype were built to verify the rationality and feasibility of the proposed scheme.
Optimal Configuration of Coupled Optical Storage Hydrogen Production System Considering Multi-body and Multi-objective Joint Optimization
Authors: Li Jianlin , Zhao Wending , Liang Zhonghao , Yan Tao 
Published: March 2023

Abstract
With the development of siting and capacity setting methods for coupled optical-storage hydrogen production systems, difficulties such as the complexity of constraints in multi-body and multi-objective system planning models, the decline of electrolytic tank life, and non-linear and non-time-series have emerged one after another. To address these difficulties, this paper proposes a double-layer planning capacity configuration method for coupled optical-storage-grid hydrogen production for transmission and transformer systems, which solves the explicit and implicit coupled double-layer optimization problems under the mixed-integer optimization framework with traditional cone optimization techniques combined with swarm intelligent optimization techniques to achieve joint optimal planning configuration for coupled optical-storage-hydrogen production systems.
Metal Paths and Distribution Characteristics of Metro Stray Current Flowing into Power Grid
Authors: Wei K , Fang D , Gao D , Li J , Wang W , Peng Q , Wang A , Lin S 
Published: March 2023

Abstract
In order to analyze the paths and distribution characteristics of stray current flowing into the power grid, this paper uses CDEGS software to establish a coupling model including the metro line and the surrounding power grid and considering the metal structures. The distribution and flow paths of stray currents in the power grid are simulated and analyzed. The results show that the cable armoring connection to the grounded grids of the metro and substation is the metal path, through which the stray current flows into the power grid. Stray currents can also invade the grid through the soil.
Evaluation Method for Distribution Network Resilience Based on Typical Scenarios Under Icy Weather
Authors: Cao Kuan , Zhou Heng , Liu Yutian , Wang Chunyi 
Published: March 2023

AbstractThe resilience of power distribution networks to extreme weather is becoming more and more concerning. A novel resilience evaluation method for distribution networks under icy weather is proposed in this paper. According to the analysis of factors affecting the distribution networks, two sets of resilience index systems are constructed. Based on the line fault probability model under icy weather, the typical weather scenarios are chosen by k-means clustering. The valuable fault scenarios are selected depending on the information entropy. To analyse the resilience of different distribution network structures, a preventive reconfiguration measure is considered in the evaluation process. Simulating results demonstrate the effectiveness of the proposed resilience evaluation method.
Online Intelligent Temperature Monitoring System for Tunnel Power Cable Based on Fiber Bragg Grating
Authors: Guo Yuanhu , Chen Jiabo , Yang Mingda , Shi Kaiyuan 
Published: March 2023

Abstract
To solve the problem that the existing method is better than the power cable and the instability of the environment leads to low accuracy of its monitoring, this paper proposes the research of an online intelligent monitoring system of tunnel power cable temperature based on fiber grating. In the design of system architecture, FACE-TD200, with abundant FPGA programmable logic resources, is used as the main device, and the SuperHawk 1002T fiber grating temperature sensor is set to realize temperature acquisition. In the stage of data acquisition and processing, considering the loss caused by the difference between the wavelength of pump light and Raman scattering light, the spontaneous Raman scattering light power of the acquired signal is calculated. According to a certain energy difference between the upper energy level and the lower energy level of the optical fiber molecule, the temperature information of the cable is calculated. The test results show that the temperature monitoring results of the designed system have a high degree of fitting with the actual temperature values, and the monitoring effect is better than that of the control group.
Flexibility Demand Calculation Model Based on Net Load Decomposition with CEEMDAN Algorithm
Authors: Wang Yao , Liang Yan , Ji Zhe , Wang Peng , Jing Yongming 
Published: March 2023

Abstract
The high proportion of renewable energy connected to the grid will propose higher flexibility requirements for the power system. Since flexible resources have different adjustment rates, it is urgent to establish a method for calculating flexibility demands at different time scales. Therefore, this paper proposes a flexibility demand calculation model based on the net load decomposition using the CEEMDAN algorithm. First, the CEEMDAN algorithm and IIR filter are used to decompose the net load curve to obtain the fluctuating components of different frequencies, and then the flexibility demands at different time scales are calculated according to these fluctuating components.
Surface matching error evaluation system design based on QT
Authors: Lu Zhibing , Yuan Yuan , Bai Jing , Xue Yuqing , You Jia , Sun Weiwei 
Published: March 2023

Abstract
Based on the analysis of existing assembly simulation positioning error evaluation methods, a visualization evaluation system of surface matching error was developed in this paper. The software can read the point cloud data measured by the CMM. And then, the software can fit the data to the surface and then visualize the surface. At the same time, the software can automatically match different parts in the database, display the best matching solution, and evaluate the matching error.
Research on the control of Interlayer Material Properties based on a Neural Network Model
Authors: Li Zeyan 
Published: March 2023

Abstract
There are many process parameters for the preparation of intercalated melt-blown nonwoven materials, and there are interactions between the parameters, which are further complicated by the intercalated airflow. Therefore, the study between process parameters, structural variables, and product performance becomes more complicated. In this paper, the relationship between the three parameters is modeled separately to provide a certain theoretical basis for the establishment of the product performance regulation mechanism. To investigate the changes in structural variables and product performance after intercalation, this paper determines the correlation between the variables and uses the idea of
ANOVA
to infer whether the control variables (whether to intercalate or not) bring significant effects on the observed variables. To explore the relationship between process parameters and structural variables. In this paper, the
soft Sigmoid
function is introduced and the root means the square error is used as the
Loss
function to reflect the goodness of fit, and finally, the
Adam
optimization process is chosen to update the parameters. Based on the above structure, BP neural network
Model I
is established. To explore the relationship between structural variables and product performance. This paper eliminates the correlation between structural variables based on factor analysis. Add neurons to
Model I
and use the factors to predict the filtration efficiency of the product. Finally, an optimization model to maximize filtration efficiency is established.