bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation of bimetallic organic framework nanocrystals and application of its calcined composites in electrocatalytic hydrogen evolution
Authors: Dai Jianbing , Wang Junyang , Liu Zhao
Published: March 2023

Zeolitic imidazolate frameworks (ZIFs) have attracted extensive research interests because of their porosity, large specific area, and adjustable aperture. In particular, a series of nanomaterials derived from ZIF-67 precursor has broad application prospects in energy and environment. In this paper, Co-ZIF nanocrystal was synthesized by solvothermal method, by introducing a second kind of transition metal Ni, the NixCo1-x-ZIF nanocrystals with single metal Co-ZIF structure were synthesized. NixCo1-x-O composites were obtained by oxidation of NixCo1-x-ZIF nanocrystals, and the electrocatalytic hydrogen evolution activity of composites modified glassy carbon electrode in 1 M KOH solution was tested. It is found that the Ni0.5Co0.5-O composites have the lowest overpotential compared with similar composites.
Study on Penetration Behavior of the Reactive Material Composite Jet against Concrete
Authors: Li Hong-da , Chen Ting-hao , Liu Cheng-zhe , Duan Hui , Zhang Zhi-li
Published: March 2023

To improve the damage performance of the shaped charge when damaging the concrete target, a new structure of shaped charge with reactive material composite liner was proposed. The behavior of reactive material composite liner-shaped charge penetrating the concrete target was researched by numerical simulation in the finite element simulation platform Autodyn-2D. The effects of the ratio of liner diameter and the ratio of the liner thickness of the inner liner to the composite liner on the penetration depth, hole diameter, and the following behavior of reactive materials were obtained. Numerical simulations show that, with increasing the liner diameter ratio and the liner thickness ratio, the penetration depth and hole diameter of the composite jet into concrete first increase and then gradually decrease. However, the increase of the liner diameter ratio and thickness ratio also means a decrease in the reactive materials’ total mass, which will significantly affect the following reactive materials into the penetration hole. Simulated results further show that it is better to find out that the liner diameter ratio is 0.7 and the liner thickness ratio is 0.2~0.4. The penetration depth and hole diameter of the composite jet into the concrete match well with the quality of the following reactive materials.
Out-of-plane Ferromagnetic Resonance and Surface Spin Wave Modes in Ni80Fe20 Film on Ripple-Patterned Sapphire Substrate
Authors: Xu Xu , Huang Haoyang , Jin Lichuan , Wen Tianlong , Liao Yulong , Tang Xiaoli , Li Yuanxun , Zhong Zhiyong
Published: March 2023

The study of surface magnetic anisotropy of magnetic films is beneficial to understanding the behaviors of films at high frequencies and further promoting their high-frequency magnetic applications. We investigated the out-of-plane ferromagnetic resonance (FMR) and surface spin wave modes in 40-nm Ni80Fe20 (NiFe) films deposited on ripple-patterned sapphire substrate with periodicity and a flat sapphire substrate by broad-band FMR technique. When measuring the FMR of the film on ripple-patterned substrate, the in-plane angle (𝜑
H
of the external applied magnetic field was along the direction of the ripples (𝜑
H
= 90°) and perpendicular to the ripple direction (𝜑
H
= 0°) respectively. The spin-wave resonance spectra consisting of up to two surface spin wave (SSW) modes were observed as the external magnetic field polar angle θH
varied from “in-plane configuration” (θH
= 90° ) to “out-of-plane configuration” (θH
= 0°). As the decrease of θH
, the two surface spin excitations disappeared in sequence and further only FMR mode was observed in the region θH
which was smaller than the “critical angle” θc
. The θc
of 𝜑
H
= 90° is found to be different from that for 𝜑
H
= 0°. The dependences of field shift vs. out-of-plane angles θH
for each SSW mode were analyzed by the surface inhomogeneity model. From the model, the surface anisotropy constants Ks
of films were obtained. The results show that the values of surface anisotropy constants for the two SSW modes are different. Compared with the film sputtered on flat sapphire substrate, after introducing ripple-patterned substrate, the variation of Ks
is only on the order of 0.01 erg/cm2 for the film of this thickness.
Microstructure morphology and tensile properties of 9Cr-ODS steels added different Y2O3 contents
Authors: Xie Rui , Wang Qing , Lv Zheng , Liu Chunming
Published: March 2023

Oxide dispersion strengthened (ODS) steels are considered to be the promising structural material candidates for Generation IV fission reactors, fusion reactor applications, new accident-tolerant fuel (ATF) cladding materials. In this study, different contents of Y2O3 were added into 9Cr-ODS steels to realize different Y/Ti atomic ratios. The microstructure of samples, kinds, number densities and size distribution characteristic of nano-scale oxide-precipitates formed in the 9Cr-ODS steel samples were investigated by synchrotron radiation SAXS, XAFS spectrum and TEM, explained the effect of Y2O3 contents on microstructures of 9Cr-ODS steel samples. The tensile properties of the 9Cr-ODS steel samples with different Y2O3 contents were also measured simultaneously. The experimental data show when Y2O3 content is 0.3%, the density of Y-Ti-O nano-clusters is the highest, reaching to 1.39×1024 /m3. At the same time, the number density of Y-Ti-O nano-clusters is the lowest, if the Y2O3 content is 0.7%. The XAFS result of 0.7% Y2O3 sample is close to a Y2O3 reference sample. The 0.3% Y2O3 has a bigger grain size than the other two samples. The 9Cr-ODS steels with Y2O3 content of 0.3% exhibit the highest tensile strength and higher ductility properties.
Preparation and Degradation Properties of Magnesium Copper Coating based on COMSOL Simulation
Authors: Yu Xiaoming , Ma Xuexin , Wang Xiaoxi
Published: March 2023

COMSOL software was used to design and simulate the preparation of magnesium copper (MgCu) coating on a titanium (Ti) alloy substrate. The influence of the deposition process and other parameters on the surface quality of coating was studied. The experimental results of the simulated preparation of MgCu coating showed that the thickness of MgCu coating by vacuum evaporation plating decreased gradually from the center to the periphery, and the coating thickness mostly depended on the deposition time and was relatively least affected by the substrate temperature. At the same time, COMSOL software was used to simulate and analyze the initial degradation behavior of MgCu coating and pure Mg coating. The results of the simulated MgCu coating degradation experiment showed that the degradation rate of MgCu coating in simulated body fluid was significantly higher than that of pure Mg coating.
Research on Improvement of Clamping Device for Online Nondestructive Tensile Testing of Braided Wire Rope
Authors: Cui Weihua , Gu Weilin , Wang Hui , Liu Chunlei
Published: March 2023

The online nondestructive tensile testing machine can crush wire ropes, during the safety tension test of braided wire ropes. To solve this problem, this paper analyzes the reasons for crushing phenomena from the aspects of static simulation and geometric analysis of wire ropes. In terms of static simulation of the tensile process, the equivalent stress, contact pressure and contact gap cloud map of the wire rope in the clamping jaw range are obtained. It is found that both equivalent stress and contact pressure of the wire rope reach maximum values at the transition section between the adjacent peak and trough of the sinusoidal curve, while both reach minimum values at the position of the peak and trough, where the wire rope is in a non-contact state. Concerning the geometrical analysis of the clamping surface of the jaws, the results show that the normal distance between the sinusoidal curves of the movable jaw and the fixed jaw is not constant in one period, which is the smallest at the transition section between the peak and the trough. Therefore, our group determine the destruction resulted from the unreasonable curve shape of the clamping surface, further improve the jaw curve and realize the non-damaged safety tension test of wire ropes.
Effect of Tempering Temperature on the Microstructure and Mechanical Properties of 42CrMo4 Steel
Authors: Zhang Yu , Zhao Hui , Liu Pengke , Wei Menghan , Lu Yang , Liu Zhanqi
Published: March 2023

This paper investigated the effects of tempering temperature (200°C, 400°C, 600°C or 800°C) on microstructures, mechanical properties, and residual stress of 42CrMo4 steel. Microstructures were characterized by OM and SEM techniques. The results show that the change in tempering temperature leads to a change in austenite, resulting in a change in hardness and toughness. The specimen showed the best combination of mechanical properties under the heat treatment condition of a tempering temperature of 600°C. The hardness, yield strength, tensile strength, area shrinkage, and elongation reached 312.74HV, 759MPa, 898MPa, 60%, and 18%, respectively. The experimental results provide a reference for the selection of the heat treatment process of 42CrMo4 steel.
Study on fatigue fracture of SW400 fine-grained high-strength steel T-lap joint
Authors: Jin Ge , Chen Yujing , Song Guoshan , Fan Qiuyue , Yu Haoxuan , Xu Guocheng , Xu Desheng
Published: March 2023

The SW400 fine-grained high-strength steel T-lap joints were welded by submerged arc welding. The influence of welding technology on the geometrical characteristics of welds and fatigue performance of the joints were studied by radial fatigue test with different welding parameters. The numerical analysis was used to study the characteristics of the stress distribution. And the fatigue fracture morphology was analyzed by scanning electron microscope. The results show that with the increase of welding line energy, the thickness of the weld increased, and the propagation direction of the fatigue crack changed from the weld to the base metal. When the thickness was less than 4 mm, the high-stress region was in the area of the weld around the weld root, and the fatigue crack propagated to the weld. When the thickness was greater than 4.5 mm, the high-stress region of AE and AS were in the weld around the root, where the crack propagated to the weld, while in the middle of the weld high-stress region was in the area of base metal around the weld root, crack propagated to the base metal. With the increase in the thickness of the weld, the maximum mises stress decreased, and the crack propagation rate decreased. The time of crack initiation was very short, which occurred in the high-stress region of the weld root in the middle of the weld.
Effect of Cryogenic Cooling on Cutting Surface Integrity and Surface Functional Properties of 6061 Aluminum Alloy
Authors: Wang Tianzhong , Duan Pengfei , Wang Jinhui , Wang Xiangyu , Qiao Yang
Published: March 2023

With the increasing environmental requirements in machining techniques, cryogenic machining technology gains more and more attention recently. We have carried out cryogenic cutting tests on 6061 aluminum alloy in this study. The effects of cryogenic cooling on machined surface roughness, surface hardness and surface functional properties were studied. The experiment results show that cryogenic cutting can reduce the surface roughness, improve the surface hardness, and thus the machined surface can obtain better wear resistance and corrosion resistance.
Analysis of Corrosion Causes of Ring Connection Fittings of ±800 kV Transmission Line
Authors: Qin Haodong , Li Wenrong , Yang Yuegang , Su Junyuan , Zhou Jiayi
Published: March 2023

The ring-linked fitting used in an ultra-high voltage DC transmission line project has suffered serious local corrosion after only one year of operation. Based on the macroscopic inspection, chemical composition analysis, galvanized layer quality analysis, metallographic organization analysis, scanning electron microscopy analysis, and energy spectrum analysis, the physical and chemical examination of the ring coupling fixture was carried out to analyze its corrosion causes and explore the corrosion mechanism. The results show that the galvanized layer of the rusted area was damaged by wear and tear due to external factors in the process of transportation, lifting, and installation. And the electrochemical corrosion led to the serious local corrosion of the fixture within a short period of operation. It is recommended to send someone to visually check the shape of the galvanized layer of the metal before the ring-linked fixture is put on the tower and to review the thickness of the zinc layer at the end of the fixture with a handheld zinc layer thickness tester if necessary.
Research on 20CrMnTi gear steel continuous cooling transformation behavior
Authors: Cui Haitao , Li Yonghua
Published: March 2023

Mechanical properties are essential for gear steel, so as the microstructure. The gear steel’s continuous cooling transformation behavior has influence on both. The performance of 20CrMnTi gear steel has a lot of room for improvement, if the continuous cooling transition behavior is clear. By using the expansion method and microstructure observation, the transformation behavior of 20CrMnTi gear steel under various cooling rates has been investigated. Through these experiments, the 20CrMnTi gear steel continuous cooling transformation curves can be getted. Through this curve, the microstructure of 20CrMnTi gear steel under different conditions can be determined. The research results of 20CrMnTi gear steel are very helpful to the industrial production of gear steel.
Design of a Fault Diagnosis Method for Transmission System of Hydraulic Support Truck for Coal Mine
Authors: Lu Zhiqi
Published: March 2023

To improve the speed of fault diagnosis of the handling car transmission system, it is necessary to design and analyze the fault diagnosis method of the hydraulic support handling car transmission system for coal mines. Firstly, the coupling demodulation abnormal signal is obtained, and the initial fault identification is realized by using the improvement instruction. Based on this, the fault diagnosis method for the transmission system of the hydraulic support truck(FFT) high-frequency fault diagnosis model is designed, and the fault diagnosis is finally realized through database regulation. The test results show that the diagnostic response time of the designed method is only 1.05s, indicating that the designed method is faster in diagnosis during practical application and can quickly assist in the repair of the transmission system of the hydraulic bracket handling car for coal mines, which has practical application value.
Chain-Length Induced Structural Polymorphism for two-dimension self-assembly
Authors: Xu Li , Cheng Xuxin
Published: March 2023

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The 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

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

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

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

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.
On the experiment and design of the Tachi-Miura polyhedron’s radial load-bearing capacity
Authors: Ma Ye
Published: March 2023

Recent research has yet to note the structural performance of the radial direction. This paper experimentally verified the factors influencing the TMP’s radial load-bearing capacity and designed the new intermediate layer patterns for the radial extension. The methodology first assumed the axial motion of TMP as the approaching among sections. Based on the analysis, the relationship among the parameters was revealed according to the experiments, which marked the TMP as a high-performance structure. The results proved the positive correlation between the axial pre-compression and the radial load-bearing capacity where the folding angle has reached the value range of the self-locking state. The new intermediate layer patterns were correspondingly designed to substantiate the hypothesis regarding the specific parts. The overlapped triangular facets and the concave vertex have enhanced the radial load-bearing capacity. The combination of the relevant parameters and the spatial attributes expands the application scope of the TMP configuration.
Process optimization and property of Ti-Al-Cr-Nb coating on titanium alloy surface by laser in-situ synthesis
Authors: Chen Ting Ting , Shi Yong Jun
Published: March 2023

Ti-6Al-4V alloys are popular structural materials for the production of critical components. However, its poor surface properties, such as friction and high-temperature oxidation, further limit its application scope. Ti-Al-Cr-Nb coating was deposited on the Ti-6Al-4V alloy through laser cladding. The tendency of cracks was low when the laser energy density was 14.33-8.19 kw · s · cm
−2, the corresponding effective process parameters were the laser power of 1600-1800 W matching the scanning speed of 4-6 mm/s. Due to the formation of Ti3Al intermetallic compound phase, and the lattice distortion caused by adding a small amount of Cr and Nb playing a role in solid solution strengthening, average vickers hardness of the coating was about 583.3 HV0.1, which was about 1.7 times that of the substrate.
Multi-domain united link adaptation technique in high-throughput satellite communication system
Authors: Liu Haike , You Yang , Shi Lifeng , Zhang Huajiian
Published: March 2023

Under the condition of using the same frequency resources, the communication capacity of high-throughput satellites is tens or even hundreds of times higher than that of traditional satellites. Compared with traditional satellites, high-throughput satellites have a large capacity, high speed, and anti-interference characteristics. However, the high-throughput satellite communication link using Ku/Ka-band is vulnerable to weather factors such as rain attenuation, so the system should have a control mechanism to achieve fade countermeasures. The existing methods include transmission power adjustment, mod cod adaptive adjustment, carrier symbol rate adjustment, etc. In this paper, various technical means are comprehensively used to compare and analyze the effect of combined control and propose a multi-domain united link adaptation technique to optimize link availability and resource utilization.
Simulation and data analysis of a fission time projection chamber based on Monte Carlo method
Authors: Zhang J. , Xiao J. , Sun J. , Chen H. , Peng T. , Zheng P.
Published: March 2023

In this study, we use Monte Carlo method to conduct
simulation research on a time projection chamber (TPC) which used
for fission cross-section measurement. Based on Garfield, SRIM,
COMSOL and other platforms and software, we explore the physical
process during its actual operation, and analyze the simulation
data. We carry out α particle track measurement experiments
with U-235 ultra-thin target, and the measured results are in good
agreement with the simulation results. This paper focuses on the
simulation and reconstruction of particle tracks at different
emission angles, and introduces the concept of ballistic deficit to
correct the experimental measurement results. The corrected 2D
distribution of particle track length and energy is closer to the
theoretical model than the uncorrected distribution.
The influence of solar variability on Atlantic basin tropical cyclones: a 10-year study
Authors: Syed Zaiful Hamzah S N A , Johari N I , Hamidi Z S , Shariff N M
Published: March 2023

The Sun is a dynamic celestial body that changes as the universe progresses through space and time. The Sun is by far the most important driving force of the climate system. This paper aims to study the impact of solar variability on our planet’s extreme weather, namely tropical cyclones in the Atlantic basin. From the year 2010 to 2020, we have analyzed the trend of Thermosphere Climate Index (TCI) values, Tropical Cyclone (TC) counts, and its maximum wind speeds. The r value presented by the Pearson’s correlation coefficient confirms a strong anti-correlation relationship of -0.719 between the TCI value and TC count. Meanwhile, the observed cyclone wind speed shows a moderately strong negative correlation with TCI values, with an r value of -0.520. The seasonal fluctuations in TCs are believed to be caused by a shift in thermal energy within the thermosphere.
Petrography of quartz sandstone in Nanggulan formation at Sermo area, Kulon Progo Regency, Daerah Istimewa Yogyakarta, Indonesia: implications on provenance and basin origin
Authors: Rizqi A F , Sastrawiguna G I
Published: March 2023

Provenance can be used to determine how the sedimentary rock formed, as reflected in the mineral composition of lithology as the composition of sedimentary minerals. The Research area is located in the Hargowilis area, Kokap district, Kulon Progo Regency, Daerah Istimewa Yogyakarta Province. This Study uses a surface geological mapping method supported by laboratory analysis in the form of petrographic analysis. Based on the analysis of the sandstone provenance in the study area, the results show the research area is included in the Recycled orogenic provenance zone, foreland uplift sub-zone to continental block provenance with a dominant quartz percentage (92%). The tectonic setting in the research area was controlled by an orogenous process during the Eocene showing that the analysis is very relevant to the provenance in the research area which shows the source of recycled rock due to the orogenous process which is then deposited in the basins formed as a result of the process.
Preparation of biofertilizer blend from banana peels along with its application in agriculture and plant microbial fuel cell
Authors: Sogani M , Sonu K , Syed Z , Rajvanshi J
Published: March 2023

Bananas comprise essential nutrients which can be used for a variety of purposes. This study aims at the preparation of a bio-stimulating fertilizer from banana peels. Different physical and chemical characterizations of the extracted biofertilizer were performed. The biofertilizer extracted from banana peels was applied to a black gram crop grown in a plant microbial fuel cell (PMFC). According to the results, an increase in the dose of banana peel extract to the black gram crop caused the germination rate to increase. After 7 days of planting, the germination rate of the black gram crop improved from 12% (control without biofertilizer) to 100% (20 ml/l of biofertilizer). The maximum power density recorded in PMFC employed with biofertilizer was 260 mW/m2 which was 2.65 times higher than the control. Higher biomass was also obtained with the addition of biofertilizer in PMFC within 60 working days which in turn led to higher generation of bioelectricity.
Characteristic of asphalt emulsion modified with natural rubber latex
Authors: Kamal M I A M , Arshad A K , Ahmad J , Shaffie E , Rais N M , Grover S , Guyot X
Published: March 2023

Polymer modified asphalt emulsions offer superior performance and lifespan as compared to conventional asphalt emulsions or hot mix asphalt surface treatments, as well as reduced life cycle costs. This study’s objective was to examine the characteristics of latex-modified asphalt emulsions using a range of tests, including those for softening point, penetration, ductility, viscosity and solubility. In order to determine the optimal latex modified asphalt emulsion, latex was added into emulsion type CSS-1hP at various ratios ranging from 1 to 9 percent, with 2 percent interval while 0 percent serving as the control. From the experiments described, the best latex modified asphalt emulsion measurement was selected using a decision matrix analysis. Decision Matrix Analysis was performed to determine that asphalt emulsion with 5 percent latex is the best choice since it offers the highest quality polymer modified asphalt emulsion.