bluuebunny/crossref_metadata_2025_split huggingface dataset:
Plasma zone plate for high-power lasers driven by a Laguerre–Gaussian beam
Authors: Wang Lukai , Liu Wei , Jia Qing , Zheng Jian 
Published: March 2023

Abstract
Plasma-based optics has emerged as an attractive alternative to traditional solid-state optics for high-power laser manipulation due to its higher damage threshold. In this work, we propose a plasma zone plate (PZP) driven by the ponderomotive force of a Laguerre–Gaussian beam when it irradiates an underdense plasma slice. We formulate the theory of the PZP and demonstrate its formation and functioning using particle-in-cell simulations. The proposed scheme may offer a new plasma-based method to manipulate high-power lasers.
Bilayer MSe2 (M = Zr, Hf, Mo, W) performance as a hopeful thermoelectric materials
Authors: Jobayr Mahmood Radhi , Salman Ebtisam M-T. 
Published: March 2023

Abstract
Significant advancements in nanoscale material efficiency optimization have made it feasible to substantially adjust the thermoelectric transport characteristics of materials. Motivated by the prediction and enhanced understanding of the behavior of two-dimensional (2D) bilayers (BL) of zirconium diselenide (ZrSe2), hafnium diselenide (HfSe2), molybdenum diselenide (MoSe2), and tungsten diselenide (WSe2), we investigated the thermoelectric transport properties using information generated from experimental measurements to provide inputs to work with the functions of these materials and to determine the critical factor in the trade-off between thermoelectric materials. Based on the Boltzmann transport equation (BTE) and Barden-Shockley deformation potential (DP) theory, we carried out a series of investigative calculations related to the thermoelectric properties and characterization of these materials. The calculated dimensionless figure of merit (ZT) values of 2DBL-MSe2 (M = Zr, Hf, Mo, W) at room temperature were 3.007, 3.611, 1.287, and 1.353, respectively, with convenient electronic densities. In addition, the power factor is not critical in the trade-off between thermoelectric materials but it can indicate a good thermoelectric performance. Thus, the overall thermal conductivity and power factor must be considered to determine the preference of thermoelectric materials.
Pinning energies of organic semiconductors in high-efficiency organic solar cells
Authors: Li Xian’e , Zhang Qilun , Liu Xianjie , Fahlman Mats 
Published: March 2023

Abstract
With the emergence of new materials for high-efficiency organic solar cells (OSCs), understanding and finetuning the interface energetics become increasingly important. Precise determination of the so-called pinning energies, one of the critical characteristics of the material to predict the energy level alignment (ELA) at either electrode/organic or organic/organic interfaces, are urgently needed for the new materials. Here, pinning energies of a wide variety of newly developed donors and non-fullerene acceptors (NFAs) are measured through ultraviolet photoelectron spectroscopy. The positive pinning energies of the studied donors and the negative pinning energies of NFAs are in the same energy range of 4.3−4.6 eV, which follows the design rules developed for fullerene-based OSCs. The ELA for metal/organic and inorganic/organic interfaces follows the predicted behavior for all of the materials studied. For organic–organic heterojunctions where both the donor and the NFA feature strong intramolecular charge transfer, the pinning energies often underestimate the experimentally obtained interface vacuum level shift, which has consequences for OSC device performance.
A fuzzy granular logistic regression algorithm for sEMG-based cross-individual prosthetic hand gesture classification
Authors: Diao Yanan , Chen Qiangqiang , Liu Yan , He Linjie , Sun Yue , Li Xiangxin , Chen Yumin , Li Guanglin , Zhao Guoru 
Published: March 2023

Abstract

Objective. Prosthetic systems are used to improve the quality of life of post-amputation patients, and research on surface electromyography (sEMG)-based gesture classification has yielded rich results. Nonetheless, current gesture classification algorithms focus on the same subject, and cross-individual classification studies that overcome physiological factors are relatively scarce, resulting in a high abandonment rate for clinical prosthetic systems. The purpose of this research is to propose an algorithm that can significantly improve the accuracy of gesture classification across individuals. Approach. Eight healthy adults were recruited, and sEMG data of seven daily gestures were recorded. A modified fuzzy granularized logistic regression (FG_LogR) algorithm is proposed for cross-individual gesture classification. Main results. The results show that the average classification accuracy of the four features based on the FG_LogR algorithm is 79.7%, 83.6%, 79.0%, and 86.1%, while the classification accuracy based on the logistic regression algorithm is 76.2%, 79.5%, 71.1%, and 81.3%, the overall accuracy improved ranging from 3.5% to 7.9%. The performance of the FG_LogR algorithm is also superior to the other five classic algorithms, and the average prediction accuracy has increased by more than 5%. Conclusion. The proposed FG_LogR algorithm improves the accuracy of cross-individual gesture recognition by fuzzy and granulating the features, and has the potential for clinical application. Significance. The proposed algorithm in this study is expected to be combined with other feature optimization methods to achieve more precise and intelligent prosthetic control and solve the problems of poor gesture recognition and high abandonment rate of prosthetic systems.
Model Predictive Current Control for Asymmetric Six-phase Permanent Magnet Motors With Less Computation and Optimized Voltage Vector Magnitude
Authors: Sun Jinyu , Chen Fubing 
Published: March 2023

Abstract
For the sake of the fixed magnitude of candidate control sets, the conventional model predictive current control (MPCC) for asymmetric six-phase permanent magnet motors suffers from huge harmonic currents. This article designs a novel MPCC that aims to improve operational performance. First, virtual-voltage vector (VV) sets are synthesized as the new candidate vectors to restrain harmonic currents. Then, a simplified method for evaluating voltage vectors is used to alleviate the computation in the enumeration process. Moreover, the duty cycle modulation with the deadbeat solution is introduced to optimize the magnitude of the VV. The modulation range can be expanded by utilizing null vectors, which will significantly reduce the torque fluctuations and flux ripples. The experiments are conducted to verify the designed control strategy.
A Damping Control for DC Distribution System Under Isolated Operation Mode
Authors: Liu Beiyuan 
Published: March 2023

Abstract
There are risks of resonant instability exiting in the DC distribution system configured with battery energy storage devices because of capacitors and inductors in the network with fast speed-controlled DC-DC converters. The DC distribution system needs battery energy storage devices to provide DC voltage support when it operates in an isolated island mode because of no AC or DC sources at that moment. To explore the key factors affecting the resonant instability of DC network, a three-terminal DC network consisting of DC voltage control, constant current control, and constant power load is used for state space modeling. Research results show that the inductors for faults current limitation interacting with the capacitors under high constant power load is the main reason causing instability. The other reason is the large parameter of the current controller. To suppress the resonant instability of the DC distribution system, a damping control strategy by filtering DC voltage in advance to the current control loop is proposed, and the parameters are selected using the roots locus method. Simulations verify the correctness and effectiveness of the proposed method.
Brushless DC Motor Common-mode Voltage Analysis
Authors: Wei Hongye , Wang Xiuhe , Wang Xinghua 
Published: March 2023

Abstract
Brushless DC motors (BLDCMs) with their own performance of obvious advantages: good speed regulation performance and high efficiency. BLDCMs have continuously replaced brushed DC and induction motors in many competitive fields and obtained more extensive applications. The common-mode voltage (CMV) in the motor parasitic capacitance coupling in the motor shaft induces the shaft voltage. It then triggers the shaft current, resulting in electrical corrosion of the bearing. It is necessary to conduct a systematic scientific analysis of its CMV. For different modulation methods, the phase voltages under three conditions without PWM modulation, HPWM_LPWM modulation, and HPWM_LON modulation are studied, FFT, and then the CMV is analyzed. Then, the correctness of the analysis is verified by simulation analysis.
Analysis of Dynamic Response and Current-Carrying Capacity of Bridge-along Cable under Typhoon Load
Authors: Qian Gang , Cong Yun , Zheng Xinlong , Zhang Zhenpeng , Yan Xunping , Liu Jinjuan , Chen Zhipeng 
Published: March 2023

Abstract
In order to study the structural dynamic response and dynamic load capacity of bridge-along cable under typhoon load, in this paper, the cable under two laying environments, including the steel box girder and steel platform, are taken as the research object. Shiyuan typhoon spectrum and harmonic superposition method are adopted to obtain the wind speed time history curves corresponding to different scales of typhoon wind force, then the wind-induced pulsating displacement of steel box girder and steel platform is calculated by using the wind speed time history curve. The electromagnetic-thermal-structure coupling model is established, and the obtained pulsating displacement under typhoon load is applied to the cable as a boundary condition to obtain its dynamic response characteristics. The eccentricity of XLPE insulation is used as the evaluation index of the current-carrying capacity of cable under different scales of typhoon wind force and different laying environments. The simulation results show that the maximum stress amplitude on the metal layer occurs near the clamp during cables are forced to move under typhoon load. The higher the typhoon wind force, the lower the allowable current-carrying capacity. Under wind force 10, the current-carrying capacity is not affected by the typhoon weather; under wind force 11, the current-carrying capacity dropped by 17.2%; under wind force 12, the current-carrying capacity dropped by 47.7%; under wind force 13, the cables are not recommended to work. The research results provide theoretical guidance for assessing the power supply reliability of bridge-along cables under typhoon disasters.
Research and Application of Mechanical State Diagnosis Method of Horizontal Telescopic Type Disconnector
Authors: Yang Tao , Wang Bing , Bao You-Zhi , Xu Ji-Yong , Niu Bo-Rui , Liu Yu-Fei , He Song 
Published: March 2023

Abstract
Most transmission parts of the horizontal telescopic type disconnector are directly exposed, resulting in frequent mechanical failures. Its mechanical state is mainly judged by manual operation experience, so it is not easy to achieve rapid and accurate evaluation. In this paper, by establishing the virtual prototype model of the horizontal telescopic type disconnector and building the corresponding test platform, the changing trend of torque in the movement process of the disconnector is analyzed. Compared with the torque-angle curves of the normal state and different mechanical defects’ states, the closing and opening process’s torque increases obviously under the jamming defect. The opening process is torque increases while the closing process’s torque decreases under the spring fatigue defect. The ending torque value of the closing process increases, or there is no typical wave peak in the meshing stage under improper travel defect. There are multiple wave peaks in the meshing stage under the three-phase position asynchrony. With this, the mechanical state diagnosis method of GW23 disconnector based on the torque-angle curve is summarized, and the installation and debugging of the same type of disconnectors in a substation are taken as examples to prove that the rapid and accurate diagnosis of its mechanical state can be realized by using this method in engineering application.
Ranging Algorithm of UAV Inspection of Transmission Line Based on Monocular Vision and SURF Method
Authors: Li Bocheng , Li Wen , Zhang Liang , Yang Haoyan , Chen Ziwei , Lei Tian , Wang Xiao 
Published: March 2023

Abstract
In view of the complexity and economy in the inspection of transmission lines by drones, a monocular ranging model based on consideration of the length and flight attitude of the object being measured is proposed to measure distances, which effectively solves the UAV ranging problem in the inspection. The range measurement procedure is divided into three parts: processing and recognition of images taken by drones, performing camera calibration experiments to obtain internal and external parameters of the camera, and building a distance measurement model to perform distance calculations. Finally, this article compares the calculated results with the actual distances and draws conclusions.
Open-circuit fault diagnosis method for inverters using deep learning and the evidence reasoning rule
Authors: Yu Hang , Gao Haibo , He Yelan , Lin Zhiguo , Xu Xiaobin , Pan Zhiqiang 
Published: March 2023

Abstract
Inverters having high voltage levels, high power density, and high integration are widely used. However, many high-frequency switch units also increase the probability of failure. Therefore, developing an accurate and stable fault diagnosis method is necessary. This paper proposes a fault diagnosis algorithm based on deep learning and the evidence reasoning (ER) rule. It not only ensures high diagnostic accuracy, but also enhances the stability of the diagnostic results. The algorithm takes the three-phase voltage source inverter as the research object and extracts the three-phase current signals with different types of faults as features. First, Convolutional and Deep Neural Network methods were utilized independently to determine a preliminary diagnosis. Second, the softmax functions of the Convolutional and Deep Neural Network outputs provided the probability distribution of the fault category, which was used as the evidence body for the ER rule to construct the fusion diagnosis. In addition, a new method of determining the reliability and the importance factors of the evidence was proposed in which the evaluation index of the deep-learning diagnosis result was applied. Finally, the final classification result was obtained using the ER rule. The proposed method can effectively enhance the accuracy and robustness compared with a single classifier.
Dynamic Buckling Analysis of the Cylindrical Shell with Radial Stiffness and Damping Constraints under Axially Impact
Authors: Gui Yifei , Xu Jiaxin , Ren Juhui 
Published: March 2023

Abstract
The governing equation of a cylindrical shell with radial stiffness and damping constraints is established and then solved. The bifurcation conditions of buckling are obtained given boundary conditions and consistency conditions. The critical loads and buckling modes are analyzed. The results reveal both radial stiffness and damping constraints will enhance the anti-buckling capacity of cylindrical shells, and the capacity of the former is better than that of the latter. The radial stiffness and damping values will have a great influence on the critical load when they are small but do not have much influence on the critical load with increasing their values.
Numerical Simulation on Structural Integrity of Grain with Large Increased Area Ratio for Solid Rocket Motor
Authors: Wang S X , Bai J Q , Zuo Y X , Qiang X W , Wang H L , Yan Q X 
Published: March 2023

Abstract
To evaluate the structural integrity of a type of solid rocket motor grain with a largely increased area ratio using free-loading modified double-base grain, the Schapery integral nonlinear viscoelastic constitutive equation with damage is derived, and the numerical simulation model of solid rocket motor grain is constructed. According to the mission profile of the grain during the equipment period, the numerical simulation research on the mechanical response characteristics of the grain under three typical working conditions, namely, platform vibration, underwater explosion impact, and ignition pressurization during the launch is carried out. The simulation results show that under the three typical working conditions, the grain will not produce structural damage and defects, and the mechanical response of the grain under the platform vibration and explosion impact load is far less than that under the launch ignition pressurization. The ignition pressurization should be considered in the grain structural integrity design of this type or similar structure solid rocket motor.
A General Approach for the Analysis of Transverse Vibration Characteristics of a Rectangular Plate with Arbitrary-shaped Openings
Authors: Zhang Wenwen 
Published: March 2023

Abstract
Based on the Rayleigh-Ritz method, the transverse vibration characteristics of a rectangular plate with an arbitrarily shaped inner opening are investigated. A modified two-dimensional Fourier series was chosen as the trial function and springs of different stiffnesses were used to equate the arbitrary boundary conditions of the rectangular plate. The Lagrange generalization of the transverse vibration of the open rectangular plate is obtained by equating the open area to a special film with physical properties of zero according to the energy superposition principle. The variational method is used to derive the characteristic equations of the thin plate and to find the intrinsic frequencies and corresponding vibration modes. The convergence of this theoretical method is analyzed by means of an example, and the accuracy of the method is verified by comparison with the results of finite element software calculations, which provides a reference for practical engineering problems.
Effect of Tip Clearance Size on the Cavitation Flow and Noise Characteristics of the NACA0009 Hydrofoil
Authors: Zhou Yudi 
Published: March 2023

Abstract
The noise characteristics of NACA0009 hydrofoil with tip clearance are discussed. Select SST k- ω Turbulence model and Schnerr Sauer cavitation model simulate tip leakage cavitation flow. The results show that the simulation results are in good agreement with the original records, and the tip clearance reduces the energy characteristics of the hydrofoil. With the expansion of tip clearance model, TLV and cavitation compressive strength gradually decrease. In addition, the study of far-field noise shows that the nonspecific curve of the total noise coefficient of far-field noise shows a disc shaped symmetric structure. Compared with the original hydrofoil, when the tip clearance is 20 mm, the far-field dipole noise value at 170 ° angle is reduced by 17.68%. Tip clearance reduces offline and far-field noise. Far field noise decreases with the increase of tip clearance model.
Fractal metasurface for THz applications with polarization and incidence angle insensitivity
Authors: Abdel Aziz Ahmed A. , Abdelsallam Ali , Gaafar Abdelhamid Ali , Abdalla Mahmoud A. 
Published: March 2023

Abstract
A Fractal metasurface-based absorber is designed to obtain a
wideband absorption in THz frequency band. The developed absorber
has a broadband absorption over more than 600 GHz bandwidth, from
0.6 THz to 1.2 THz, with a minimum absorption percentage of 70%
and total absorption from 1 to 1.1 THz. The proposed fractal
structure is investigated using a Modified Split Ring Resonator
(MSRR). The absorption coefficient of the proposed fractal
metasurface is compared with the modified initially SRR
metasurface. The results indicate that by using fractal design, the
metasurface operating band is summed up, resulting in a wide
bandwidth. The absorption coefficient of the proposed fractal
metasurface is studied using two different simulation software
programs to ensure the obtained results, with a high agreement
between the results of them. The designed metasurface has a similar
absorption response for the different polarization of the incident
wave. The impedance of the designed metasurface indicates that, for
the operating band, the fractal metasurface has a surface impedance
of around 377 Ω, indicating a good matching between the
designed metasurface and air. Different incidence and polarization
angles are studied with results showing its insensitivity to both of
them. The designed metasurface is compared with previously published
works, showing wider bandwidth, higher absorption, and incidence and
polarization insensitivity. The proposed metasurface absorber can be
used for biomedical applications.
Theoretical principles and practical aspects of the theory of transformation of interaction measures with external objects and the environment for ground robot complexes
Authors: Zalypka V 
Published: March 2023

Abstract
The guiding documents regarding ground robotic complexes (GRC) of the USA were analyzed and it was found that the basis of the development of modern GRC is artificial intelligence. It was found out that GRC is the preservation of life and health of servicemen in battle. It was established that the transformation of the means of interaction with external objects and the environment (MIEOE) is due to the need to improve the operational properties of the GRC. A new idea is proposed to provide a dual function of the MIEOE for the GRC due to their transformation. Individual cases of the transformation of the wheel drive and the design of the manipulators were analyzed, and a mathematical description of the transformation of the circle into figures for the construction of the wheel drives of the GRC of increased cross-country ability was carried out. It has been established that the promising MIEOE GRC can be manufactured in a combination of different materials and combine the latest technologies for the use of gallium nitride transistors, soft crystals and graphene thread (films).
Modeling the sequence of part machining to minimize the time spent on the machining center, considering the working tool changing
Authors: Matviishyn Yevhen 
Published: March 2023

Abstract
An algorithm for choosing a rational sequence for machining a part on a machine with a tool magazine is proposed using the drilling operations example. The algorithm is based on the analysis of all possible options and the calculation of the time spent on each of them. In this respect, the working tool (drill) change is considered, if it is necessary to switch to another machining type (drilling a different diameter hole). Three types of time costs are included in the calculation of the total machining time for one part: the duration of each operation, the duration of the transition to the next operation, and the duration of the working tool change. The result of the algorithm application is the sequence of machining the part with the least total time spent on transitions to the machining areas and the working tool changing.