bluuebunny/crossref_metadata_2025_split huggingface dataset:
Study of the Electron cyclotron power deposition in TOMAS
Authors: Buermans J , Adriaens A , Brezinsek S , Crombé K , Dittrich L , Goriaev A , Kovtun Yu , López-Rodríguez L D , Petersson P , Van Schoor M 
Published: July 2024

Abstract
Efficient Electron Cyclotron Resonance Heating (ECRH) breakdown and pre-ionization can be achieved with fundamental X-mode, while higher harmonics can introduce excessive stray radiation. Fundamental heating however is characterized by a low cut-off density, introducing additional power absorption mechanisms in the plasma. A good knowledge of these mechanisms is necessary to use fundamental X-mode as an efficient pre-ionization method. Numerous experiments were performed on the TOroidally MAgnetized System (TOMAS) to study the power deposition for ECRH in helium. It is a facility designed to study plasma production, wall conditioning and plasma-surface interactions and is operated by LPP-ERM/KMS at the FZ-Jülich. The influence of the injected power P

EC
and the magnetic field B
0 on the absorption mechanisms is examined, in order to reduce stray radiation and improve the absorption efficiency. This will allow to determine the best scenarios for plasma start-up and pre-ionization.
Weak time-scale separation at the onset of oscillatory magnetoconvection in rapidly rotating fluids
Authors: Sreenivasan Sethulakshmy Edathara , Sahoo Swarandeep 
Published: July 2024

Abstract
Convective instabilities are one of the integral parts of the dynamics of flows driven by thermal buoyancy. Naturally, physical phenomena exhibit a wide disparity in the length and timescales of the field variables in numerical simulations and experimental observations. Such variations are not represented in the traditional normal mode stability analysis attempting to understand the onset of convection. This study attempts to incorporate different time constants for different perturbation variables in the linear stability analysis with the help of a Taylor series expansion. The infinite horizontal layer model is chosen for simplicity. Apart from the classical Rayleigh-Bénard system, additional physical effects such as background rotation and magnetic field have been considered with plausible implications for geophysical flow applications. The time scale separation is implemented by considering a slight change in the frequency of temperature perturbation compared to that for other physical quantities. Both analytical and numerical methods have been utilised for the investigation. The threshold buoyancy force is reduced when the temperature perturbation has a smaller frequency than the frequencies of other variables. Besides that, the onset wavenumber and frequency of the oscillatory modes are modified due to weak scale separation from the onset characteristics of the reference case. In particular, enhanced frequency of temperature perturbations leads to smaller-scaled magnetically controlled convective rolls and larger-scaled viscously controlled instabilities at the onset. A robust dependence of the onset characteristics with the parameter quantifying the timescale separation is obtained. Additionally, two transitions in the convective onset modes with scale separation have been identified.
Ultra-broadband and thin switchable multifunctional metamaterial for terahertz wave
Authors: Jalal Abdul , Khan Alina , Qasim Muhammad , Qureshi Ubaid Ur Rahman , Moghise Mojtaba 
Published: July 2024

Abstract
An ultra-broadband thin multi-functional and switchable metamaterial is examined in the terahertz (THz) regime. The proposed design achieved high polarization conversion efficiency and can be switched from a polarization converter to an absorber using the phase change transitioning of vanadium dioxide (VO2). The linear polarization conversion is achieved from 6.0 THz to 15.0 THz, achieving a bandwidth of 9.0 THz, and the absorption is realized from 5.0 THz to 16.0 THz with a bandwidth of 11.0 THz. These broadband characteristics were achieved by a simple metamaterial design incorporating a few layers. The relative bandwidth was 85% for the polarization conversion and 105% for the absorption. Moreover, the angular stability of the designed structure is impressive for various incident angles from 0° to 45°. The proposed switchable design has the potential to contribute to the development of tunable polarization rotating devices, on/off switching LPC devices, which have wide application potentials in THz detection, sensing, adaptive optics, and communications.
Jeans instability in the particle-antiparticle system with the different gravitational charges and the ALPHA-g experiment
Authors: Trigger S A 
Published: July 2024

Abstract
The principle of binding energy conservation during charge conjugation and the hypothesis of gravitational repulsion of antiparticle masses is used to formulate appropriate two-component hydrodynamics. The dispersion relation for small perturbations is obtained and analyzed. The modified Jeans instability for matter-antimatter system is found as the function of arbitrary fraction of the repulsive matter. For the hydrogen-antihydrogen system, the recent ALPHA-g experimental result is used to apply to the early Universe evolution. It is shown that the non-damping sound mode exists if the annihilation damping is absent.
Quasinormal modes and greybody factor of a Lorentz-violating black hole
Authors: Guo Wen-Di , Tan Qin , Liu Yu-Xiao 
Published: July 2024

Abstract
Recently, a static spherically symmetric black hole solution was found in gravity nonminimally coupled a background Kalb-Ramond field. The Lorentz symmetry is spontaneously broken when the Kalb-Ramond field has a nonvanishing vacuum expectation value. In this work, we focus on the quasinormal modes and greybody factor of this black hole. The master equations for the perturbed scalar field, electromagnetic field, and gravitational field can be written into a Schrödinger equation. We use three methods to solve the quasinormal frequencies in the frequency domain. The results agree well with each other. The time evolution of a Gaussian wave packet is studied. The quasinormal frequencies fitted from the time evolution data agree well with that of frequency domain. The greybody factor is calculated by Wentzel-Kramers-Brillouin (WKB) method. The effect of the Lorentz-violating parameter on the quasinormal modes and greybody factor are also studied.
Numerical Simulation and Optimization Design of Particle Transport in 3D Printers Spiral Extrusion 3D Printers
Authors: Zhang Yukai , Shi Zhiliang , Huang Jiatao 
Published: July 2024

Abstract
In response to the challenges of feed delay and inconsistent wire production in existing 3D printers, a novel 3D simulation model for spiral extrusion 3D printers was developed. This model incorporates the particle filling rate within the spiral groove as a critical evaluation criterion, establishing a correlation between the transport section parameters and the filling rate. The simulation software STAR-CCM+ was utilized for in-depth analysis, leading to structural optimizations based on various feeding mechanisms. The effects of different hopper models on feeding efficiency were investigated using the principles of the discrete element method. The findings indicate that the enhanced feed structure effectively addresses particle transportation issues within the printer. An increase in rotational speed is shown to improve the filling efficiency of the spiral groove, while simultaneously reducing the residence time of the particle material in the extruder, which in turn affects particle melting quality. By integrating the simulation data with experimental validation, an optimized printing structure was designed to fulfill the requirements of spiral extrusion printers.
Design of A 12-phase Clock Generator Based on DLL
Authors: Zhang Zhenbu , Wang Xiaocha , Huang Shengming 
Published: July 2024

Abstract
This article proposes a 12-phase clock generator for DC-DC power supply chips, which can be used for external clock synchronization of DC-DC and serves as the foundation for multiple parallel connections of DC-DC. This article is based on the NTC 0.35 um BCD process and verified through simulation by using Cadence software. In typical environments of 3.3 V and 27°, the clock input range is 832 K-49.6 MHz, the time to reach stability is less than 5 us, the clock jitter is less than 1%, the duty cycle error is less than 3.5%, and the phase error generated is less than 1%.
Research on vibration test method of electric actuator
Authors: Hu Xiaoguang , Li Jian , Gao Zhigang , Niu Pingjuan , Wang Wenbo , Li Yunxiang , Wan Zhicong , Tan Qixiang 
Published: July 2024

Abstract
The stable, safe, and reliable operation of electric actuator valve systems is of great significance in industrial production. This paper proposes a vibration test method for electric actuators, employing the test to meet the test severity level as the first priority, with random frequency vibration within 10 Hz to 1000 Hz. The vibration acceleration is loaded with a Gaussian distribution, which can be used to simulate the irregular vibration of electric actuators in the actual working conditions of the working environment. The test is divided into up and down vibration (z-axis), left and right vibration (x-axis), and front and rear vibration (y-axis) in three directions independently to verify the electric actuator from the mechanical structure and the circuit structure in order to meet the reliability requirements of the actual production.
FSI Modeling and simulation analysis of superimposed valves in flow state of hydraulic shock absorbers*
Authors: Yu Zhenhuan , Zhang Na , Zhao Jiakun 
Published: July 2024

Abstract
This study, through rigorous bench testing, has identified the pivotal parameters influencing the oil flow state within the shock absorber. Based on the Reynolds number parameter model, a reduced parameter model was established, incorporating the number of holes in the throttle valve, their diameters, and the diameters of the piston and piston rod as fundamental parameters. To ensure the model’s precision, this study developed high-accuracy solid and fluid finite element models, defined specific time steps for both laminar and turbulent flows along with their respective numerical methods, and executed a detailed Fluid-Structure Interaction (FSI) finite element simulation analysis. The findings indicate that fluid-structure interaction simulation accurately captures the shock absorber oil’s flow states across laminar, transitional, and turbulent phases, identifying the maximum Reynolds number position, with the simulation’s velocity-specific results aligning closely with the parameter model, showing a maximum deviation of 22%, a minimum of 2%, and an overall average error of 9.1%.
Structural design and finite element analysis of a milling machine sliding saddle
Authors: Zhang Weiwei 
Published: July 2024

Abstract
With the rapid development of modern manufacturing, the requirements for milling machine products are becoming higher and higher, leading to higher requirements for the working accuracy of milling machines. It is necessary to use the finite element method for static analysis of key components. This article uses 3D software to establish a geometric model of the milling machine saddle and establishes a finite element model. Finite element analysis is performed on the stiffness and strength of the sliding saddle in the middle of the crossbeam and the spindle sleeve at the lowest end of the sliding saddle under the load condition. Through analysis, it is known that the milling machine slide saddle is located in the middle of the crossbeam, and the spindle sleeve is located at the lowest end of the sliding saddle, which is the worst working condition. According to the strength theory, it is verified that its strength meets the requirements. This static analysis can provide reliable data for the design optimization of the milling machine saddle.
Single Event Effect Protection Design of Output Module of Relay Protection Device
Authors: Gao Shihang , Ma Yulong , Zhao Fengrong , Zou Zhiyang , Teng Chuntao 
Published: July 2024

Abstract
A design scheme for single event effect protection of output modules has been proposed, which combines software and hardware to solve the problem of output relay misoperation or refusal to operate caused by single event effect in the output module of relay protection devices. The core idea is to use dual path independent logic processing in software and dual circuit combination driving control in hardware to ensure that the output of the relay protection device will not misoperate when single event effects occur. The error detection and correction of instruction processing code is designed for MCU on-chip instruction storage areas that are easily affected by single event effects. It executes cyclically, allowing the output module to quickly return to normal after single-event effects occur, ensuring that the device output will not refuse to operate when it is expected to operate. When an irreparable error is detected, the output power supply is locked to ensure that the device output does not misoperate. Based on the experimental verification results, the reliability of the relay protection device is improved through the above methods.
Research on the load-bearing performance of new bionic lunar rover wheels
Authors: Zhao Liangliang , Luo Xiaotao , Ma Jia , Du Yupei , Hu Zhenyu , Zhang Rui , Wen Lige , Zhou Guifen 
Published: July 2024

Abstract
In response to the limitations of existing flexible metal wheels in meeting heavy load requirements, a tire/foot integrated bionic wheel with characteristics of being non-inflatable, high load-bearing, and effective vibration damping was designed. A detailed study was carried out to analyze its load-carrying properties under different mechanical working conditions using the finite element method. By simulating different static loading conditions in the vertical direction and considering the balance between wheel elasticity and stiffness, the final plate thickness was determined to be 1 mm. Radial stiffness simulation revealed a radial stiffness of approximately 250 N/mm for the novel bionic lunar rover wheel. According to the above simulation results, the mechanical properties of the wheels of the bionic lunar rover are manufactured and tested, and the test results show that the experimental results are consistent with the simulation results, which verifies the accuracy of the simulation results.
Research on High-Traction Bionic Mesh Lunar Rover Wheel
Authors: Zhao Yongjiao , Zhang Rui , Wen Lige , Luo Xiaotao , Ma Jia , Du Yupei , Hu Zhenyu 
Published: July 2024

Abstract
In addressing the traction performance, mobility, and power consumption issues of lunar rover wheels, this study focuses on a bionic mesh wheel inspired by ostrich toe characteristics. By establishing a simulation environment and assembling a processed prototype wheel, both the bionic and comparative wheels underwent discrete element simulation experiments and traction and mobility tests. The experimental evaluation criteria included settlement depth and driving torque. The results revealed superior traction and mobility performance of the bionic wheel compared to the conventional wheel, with enhanced energy efficiency.
Research on dynamic characteristics of rolling bearing slippage under different working conditions
Authors: Yu Xiao , Han Jianggui , Ming Tingfeng 
Published: July 2024

Abstract
With the development of aerospace, military and other fields, higher requirements are put forward for the life, reliability and accuracy of rolling bearings. Rolling element slippage, as a phenomenon that cannot be ignored in the work of rolling bearings, affects the accuracy and life of rolling bearings. The present paper discusses the dynamic modelling of rolling bearing slippage, drawing on the research conducted by both domestic and international scholars in this field. The variations in rotational speed and revolution speed, the fluctuations in sliding speed between the inner ring raceway and outer ring raceway, as well as the impact of bearing load and speed on rolling element slippage during the process.
A new power prediction model for wind power generation
Authors: Yang Jiacheng , Wen Shiyuan , Lin Jia 
Published: July 2024

Abstract
A wind power generation forecast model based on WOA-SVM is presented to exploit effective information in different data sets completely. This model addresses the difficulties associated with parameter selection, low prediction accuracy, and susceptibility to local optima in short-term wind energy prediction. The model systematically investigates the relationship between various wind parameters (mean wind speed, maximum wind speed, minimum wind speed, mean wind direction, and mean hull position) and wind power. It then evaluates the model’s performance using mean absolute error and coefficient of determination. The predictive outcomes of the WOA-SVM model are contrasted with those of the SVM model, PSO-SVM model, and extreme learning machine (ELM) model, utilising authentic data from a wind farm located in northern China in the year 2021. The overall evaluation indicates that the WOA-SVM model outperforms the other models in short-term wind energy prediction, demonstrating superior prediction accuracy.
Aided assembly technology of satellite honeycomb sandwich panel insert based on virtual and real fusion
Authors: Wang Bin , Liu Lixia , Xue Wenjuan , Yang Fenglong , Hong Youxie , Zhou Yong , Wang Kai , Niu Hairui 
Published: July 2024

Abstract
Aiming at the problems of frequent low-level quality and difficulty in improving assembly efficiency in the assembly process of satellite honeycomb sandwich panel insert, the 3D model of the honeycomb sandwich panel is formed into high-definition model projection image by feature processing and extraction for 3D process information, and the virtual-real fusion insert aided assembly system is constructed, which is composed of core components such as camera, high-definition projector, and measurement software. Through structured light projection technology and projection algorithm based on landmark point transformation, the projection image can be accurately matched with the contour and hole position of the physical, structural panel, which can effectively assist the assembly process of the insert and reduce the low-level quality problems such as wrong use of parts and reverse polarity assembly. Compared with the traditional manual assembly method, the efficiency is improved by more than 200%, and the error rate is reduced by more than 300%.
Finite element analysis of radial temperature of transmission conductor in low-temperature environment
Authors: Wang Ying , Gao Xiuyun , Hou Meng , Zhang Lingquan , Zhang Xiao 
Published: July 2024

Abstract
Most existing studies simplify conductors as isothermal cylinders, neglecting their actual structure and the inter-conductor contacts. This is especially problematic in regions like Northeast and Northwest China, where the conductors face harsh working environments due to significant seasonal temperature variations. Additionally, there is a lack of research under extreme low-temperature conditions. Considering these factors, a temperature field in low-temperature environments was established based on the heat conduction equation. A finite element model and a mathematical model for the transmission conductor were developed using the actual structure of the JL/G1A-240/30 type steel-core aluminum stranded conductor as a reference. Constraint conditions were set, and the model was simulated under various environmental conditions using the finite element ANSYS software. This simulation calculated the radial temperature distribution of the conductors in low-temperature environments, along with the combined effects of transmission line current load, air convection cooling, sunlight intensity, and wind speed on the radial temperature distribution. The results indicate that this method can effectively determine the radial temperature values of transmission conductors under different meteorological conditions, which are significantly influenced by environmental temperature and wind speed. This is beneficial for enhancing the operational safety and stability of transmission lines, achieving dynamic capacity expansion, and improving the transmission capacity of the lines.
Analysis on Fuel Spillage from Surge Tank and Optimization of Vent System for Civil Aircraft
Authors: Zhao Shiyang 
Published: July 2024

Abstract
This paper introduces the composition and function of civil aircraft fuel tank ventilation and inerting systems. The ventilation and inerting systems are closely related to the fuel tank, so there is a cross-link between the two. Given the fuel spillage phenomenon of the surge tank, which occurs during the climb of the aircraft due to the imperfect design of the fuel tank vent system, the mechanism of the fuel spillage and the role of the inerting system in the fuel spillage process are analyzed. Meanwhile, the optimization measures of the fuel tank vent system are introduced, which can provide experience reference for the cross-linking design of the fuel tank system and inerting system of other aircraft.
Research on the analysis strategy of electric vehicle charging demand based on multi-correlation daily scenario generation
Authors: Jiang Weixing , Han Wei , Wan Ye , Yang Wenhui , Li Jiayi 
Published: July 2024

Abstract
With the continuous increase of the penetration rate of OFELECTRIC vehicles, their high random charging loads exert a more significant effect on the stability of the electrical system. Simultaneously, the past charging patterns of electric vehicles indirectly influence the possible future charging activities of these vehicles. Therefore, in order to characterize the correlation between the predicted daily charging behavior of electric vehicles and its historical daily charging behavior, this article uses scene generation theory to fully mine the original multi-correlation Internal characteristics of electric vehicle charging behavior among the original multi-correlation day charging scenario set (OMCDCSS), generating massively generating multi-correlation day charging scenarios (GMCDCS) similar to the probability distribution of OMCDCSS. Secondly, the related scene set (RSS) is screened in the generation of multi-correlation day billing scenario (GMCDCSS) on the basis of weighted Spearman rank (SR). Get the forecast result of electric vehicle load interval.
Combined Rotor-Side and Grid-Side Suppression of Sub-Synchronous Oscillation in Doubly-Fed Wind Turbines
Authors: Wang Haobo , Wang Hongtao , Xin Peiqi , Xu Changmeng 
Published: July 2024

Abstract
In the field of wind power generation, the significant geographical separation between wind farms and load centers often necessitated the long-distance and large-scale transmission of wind energy, which was typically achieved through transmission lines equipped with series compensation capacitors. However, this setup led to interactions between the series compensation capacitors and the control systems of doubly-fed induction generators (DFIGs), potentially causing sub-synchronous oscillations in grid-connected systems. To address this issue, our study focused on a DFIG-based wind farm interconnected via a series-compensated line. We proposed an innovative suppression strategy that incorporated additional virtual damping on the grid side. This strategy was effectively combined with an ancillary approach of adding virtual inductance on the rotor side, offering a robust solution to mitigate sub-synchronous oscillations. The simulation results showed that the joint application of these two strategies was more effective than implementing them individually. Notably, the strategy involving additional virtual damping on the grid side outperformed the approach of adding virtual inductance on the rotor side.