bluuebunny/crossref_metadata_2025_split huggingface dataset:
On the structure and icosahedral interconnectivity in Tantalum monatomic glass produced under pressure
Authors: Kbirou Meryem , Atila Achraf , Hasnaoui Abdellatif 
Published: July 2024

Abstract
Proper processing of bulk metallic glasses (BMGs) under pressure is a promising approach to tailor their properties. However, to fully understand how pressure processing affect the final glass properties, a clearer understanding of how the pressure affects the structure of the glass at both short- and medium range levels is required. Accordingly, using molecular dynamics simulations, we study the effect of cooling under pressure on the local structure and the medium-range connectivity in a model Tantalum monatomic metallic glass. Crystalline grains form in the Ta sample with increasing the pressure under which the sample was cooled. These observations were confirmed by decreasing the fivefold symmetry with increasing pressure. The connectivity type between the perfect icosahedra was determined and showed that when cooled under pressure, intercross sharing is favored in the higher pressure. This work gives insights into understanding local structural changes induced by the pressure in metallic glasses.
Inflation and Higgs phenomenology in a model unifying the DFSZ axion with the majoron
Authors: Matlis Michael , Dutta Juhi , Moortgat-Pick Gudrid , Ringwald Andreas 
Published: July 2024

Abstract
The Two-Higgs-Doublet-Standard Model-Axion-Seesaw-Higgs-Portal inflation (2hdSMASH) model consisting of two Higgs doublets, a Standard Model (SM) singlet complex scalar and three SM singlet right-handed neutrinos can embed axion dark matter, neutrino masses and address inflation. We report on an investigation of the inflationary aspects of 2hdSMASH and its subsequent impact on low energy phenomenology. In particular, we identify inflationary directions for which the parameter values required for successful inflation do not violate perturbative unitarity and boundedness-from-below conditions.
By analyzing the renormalization-group flow of the parameters we identify the necessary and sufficient constraints for running all parameters perturbatively and maintaining stability from the electroweak to the PLANCK scale. We observe that stringent constraints arise on the singlet scalar self coupling from inflationary constraints, i.e., λS
∼ 10-10. Further, we find that all theoretical and experimental constraints are satisfied if the portal couplings are typically in the range (v/vS
) and (v/vS
)2 (where v, vS
refer to the electroweak and singlet scalar vacuum expectation value respectively). As a consequence, inflation is realized in a variety of field space directions in the effective single field regime. Finally we provide testable benchmark scenarios at colliders.
Correcting for ERP latency jitter improves gaze-independent BCI decoding
Authors: Van Den Kerchove A , Si-Mohammed H , Van Hulle M M , Cabestaing F 
Published: July 2024

Abstract

Objective. Patients suffering from heavy paralysis or Locked-in-Syndrome can regain communication using a Brain–Computer Interface (BCI). Visual event-related potential (ERP) based BCI paradigms exploit visuospatial attention (VSA) to targets laid out on a screen. However, performance drops if the user does not direct their eye gaze at the intended target, harming the utility of this class of BCIs for patients suffering from eye motor deficits. We aim to create an ERP decoder that is less dependent on eye gaze. Approach. ERP component latency jitter plays a role in covert visuospatial attention (VSA) decoding. We introduce a novel decoder which compensates for these latency effects, termed Woody Classifier-based Latency Estimation (WCBLE). We carried out a BCI experiment recording ERP data in overt and covert visuospatial attention (VSA), and introduce a novel special case of covert VSA termed split VSA, simulating the experience of patients with severely impaired eye motor control. We evaluate WCBLE on this dataset and the BNCI2014-009 dataset, within and across VSA conditions to study the dependency on eye gaze and the variation thereof during the experiment. Main results. WCBLE outperforms state-of-the-art methods in the VSA conditions of interest in gaze-independent decoding, without reducing overt VSA performance. Results from across-condition evaluation show that WCBLE is more robust to varying VSA conditions throughout a BCI operation session. Significance. Together, these results point towards a pathway to achieving gaze independence through suited ERP decoding. Our proposed gaze-independent solution enhances decoding performance in those cases where performing overt VSA is not possible.
Non-linear MHD investigations of high-confinement regimes without type-I ELMs in ASDEX Upgrade and JT-60SA
Authors: Cathey A. , Hoelzl M. , Meier L. , Dunne M.G. , Huijsmans G.T.A. , Gil L. , Harrer G.F. , Aiba N. , Cruz-Zabala D.J. , Lackner K. , Pamela S.J.P. , Viezzer E. , Wolfrum E. , Günter S. ,   the JOREK Team,   the ASDEX Upgrade Team,   and the EUROfusion WPTE Team
Published: July 2024

AbstractLarge edge localised modes (ELMs) would cause an unacceptable reduction of material lifetime in future large tokamaks due to the significant amount of energy expelled from the magnetically confined region towards the plasma facing components. Thoroughly validated modelling of regimes devoid of large ELMs is crucial as it may then provide predictive insights prior to tokamak operation and design. This paper describes recent efforts pursued with the non-linear extended MHD code JOREK in the modelling of three scenarios without large ELMs: quiescent H-mode (QH-mode), quasi-continuous exhaust regime (QCE regime), and the enhanced D-alpha H-mode (EDA H-mode). For each of these regimes, the non-linear dynamics observed in the simulations are detailed and compared to experimental observations of the underlying instabilities of each regime (edge harmonic oscillation for QH-mode, small ELMs for QCE regime, and quasi-coherent mode for EDA H-mode). For QH-mode, the kink-peeling mode is found to govern the dynamics and a transition to a large ELM is obtained above the same density threshold as in the modelled experiment. For the QCE regime and EDA H-mode, resistive peeling–ballooning modes dominate and pedestal fluctuation frequencies correspond well to experimental observations. The dominant mechanisms for the excitation and suppression of these instabilities are presented and their influence on simulation dynamics is shown. Finally, predictive simulations of edge instabilities at different values of plasma resistivity in a 4.60 MA scenario with low edge safety factor in JT-60SA are presented.
Many-sided Poisson–Voronoi cells with only Gabriel neighbors
Authors: Hilhorst H J 
Published: July 2024

AbstractLetpnGbe the probability for a planar Poisson–Voronoi cell to ben-sidedand have only Gabriel neighbors. Using an exact coordinate transformation followed by scaling arguments and a mean-field type calculation, we obtain the asymptotic expansion oflog⁡pnGin the limit of largen. We determine several statistical properties of a many-sided cell obeying this ‘Gabriel condition.’ In particular, the cell perimeter, when parametrized as a functionτ(θ)of the polar angleθ, behaves as a Brownian bridge on the interval0⩽θ⩽2π. We point out similarities and differences with related problems in random geometry.
Design and Analysis of Five-Phase Fault-Tolerant Vernier Permanent Magnet Machines for Direct-Drive Occasions
Authors: Ding Lingwei , Zhang Meng , Xiong Ling , Fan Xun , Hu Xin , Xie Yinpeng , Ren Qiuye , Cai Cheng 
Published: July 2024

Abstract
A fault-tolerant vernier permanent magnet machine (FTVPMM) with five phases for direct-drive occasions is designed and analyzed. The construction of the proposed FTVPMM is introduced and the principle of the vernier modulation effect is investigated. Parameters are designed and optimized by finite element analysis (FEA), including tooth width, slot opening, PM thickness, pole-arc coefficient, air-gap length, and rotor yoke. Furthermore, major electromagnetic performances are discussed, including cogging torque, no-load back electromotive force (BEMF), output torque, and fault-tolerant capability.
An Edge Detection Method for Welding Pool Based on An Improved Canny Algorithm
Authors: Zou Lin , Zheng Yunlong , Lu Jie 
Published: July 2024

Abstract
In this study, an improved Canny algorithm is proposed for detecting welding pool edges in complex environments, considering the issues of inaccurate extraction, discontinuity, and susceptibility to noise in traditional edge detection algorithms. Firstly, the original Gaussian filter is replaced with a hybrid filter that combines dark channel prior defogging and bilateral filtering used for image denoising. Then, a four-direction Sobel operator is utilized to calculate gradient amplitude and direction. Furthermore, the double threshold required for extracting and connecting pool edges is obtained by using an enhanced quadratic Otsu algorithm. Experimental results demonstrate that, compared with the traditional algorithm, the improved Canny algorithm achieves an approximately 51.6% increase in PSNR and about 0.04 improvement in SSIM, enabling more accurate and comprehensive extraction of welding pool edge information.
Optimized design of armored vehicle door structure with negative Poisson’s ratio core layer under blast impacts
Authors: Li Mingxing , Fu Tiaoqi , Zhou Di , Wang Xianhui , Wu Mengyang , Qin Weiwei , He Jiahao , Yao Tuzao , Sun Xiaowang 
Published: July 2024

Abstract
The door is the main part of the side wall of the vehicle body and the key to the side explosion protection of the vehicle. First of all, this paper takes a certain type of armored vehicle as the research object to analyze the side blast protection performance of the equivalent composite door based on the sandwich structure with a negative Poisson’s ratio core layer. Then, the effect of the cell length, cell height, cell angle, cell thickness, and thickness gradient of the core layer on the explosion protection performance of the sandwich structure is studied. Finally, the door structure is optimally designed based on the basic structural parameters of the cells. The results show that the side blast protection of the vehicle is improved compared with the original door, and the shoulder and head injuries of the occupants under side blast impact are reduced to a great extent.
A coarse to fine calibration method for the q-X-Z type wafer pre-alignment device
Authors: Wu Huikai , Zhou Yijun , Luo Chen , Si Buchao 
Published: July 2024

Abstract
The wafer pre-alignment device is a crucial component of the equipment front-end modules (EFEM) in the integrated circuit (IC) manufacturing industry. It corrects the wafer position and orientation errors before the wafer is transferred to the subsequent fine alignment wafer stage. To solve the calibration problem of a q-X-Z type wafer pre-alignment device, the study establishes its kinematic model and constructs the relationship between each axis and a laser sensor. Compared to the conventional method of directly selecting 4 points’ wafer edge data to achieve calibration, this paper proposes a method that makes full use of the edge data of a square calibration board. This method solves the device parameters through iteration based on coarse to fine thoughts and obtains a calibration accuracy within 10 microns. The statistical accuracy and operational repeatability of the proposed method are verified through a series of calibration experiments of the wafer pre-alignment device.
Design of Automotive Collision Avoidance Lower Position Controller Based on GA Optimization
Authors: Huang Yuhao , Ni Fuyin 
Published: July 2024

Abstract
To improve the control stability of the lower controller in the vehicle collision avoidance system, and solve the problem of traditional fuzzy PID not providing good dynamic performance under large parameter changes, a lower controller for vehicle collision avoidance based on genetic algorithm optimized fuzzy proportional-integral-derivative (PID) control was studied. The vehicle collision avoidance system collects real-time motion information of the preceding vehicle through millimeter-wave radar and calculates the safety distance. The safety distance model and upper controller of the system calculate the required acceleration of the vehicle. Afterwards, the expected acceleration of the vehicle is controlled by the lower controller of fuzzy PID. At the same time, the improved GA is used to adjust the PID parameters, solving the problem of poor robustness of the lower controller. A simulation platform was built to simulate the longitudinal vehicle collision avoidance control system jointly. The simulation results show that the lower controller designed based on this control algorithm has better stability and meets the collision avoidance requirements, providing an important basis for the development of vehicle control systems.
Experimental Study and Influencing Factors Analysis of the Electric Gear Urea Pump Supply Performance
Authors: Tian Bingqi , Sun Lijing , Mao Liwei 
Published: July 2024

Abstract
An experimental study on four electric gear urea pumps was carried out, and the variation rules of supply flow rate, speed, and volumetric efficiency of the urea pumps were obtained. Test results show that the volumetric efficiency will be affected by the coupling of multiple factors simultaneously, showing complex nonlinearity. A simulation model whose accuracy was verified by test data was established for analyzing the influencing factors of supply performance. With the increase in speed, the variation of volumetric efficiency has a linear relationship with the change of radial clearance and a quadratic parabola relationship with the change of axial clearance. In the range of working speed, the influence of radial clearance on volumetric efficiency is more significant, while the influence of axial clearance on volumetric efficiency will be gradually enhanced with increasing speed. The radial tolerance range should be as small as possible to ensure the consistency of the urea pump’s volumetric efficiency.
Youla Parameterized Adaptive Hybrid Control for Active Vibration Control Platform
Authors: Yang Cong , Liu Tianqi , Li Feng , Wu Zhizheng 
Published: July 2024

Abstract
To increase the vibration attenuation of the damped platforms, an adaptive hybrid vibration control algorithm based on Youla (Q) parameterization is proposed, where the vehicle suspension platform is considered as an application example. First, an inner controller is designed to keep the hybrid control system stable. Then, the controller is extended to the Youla parameterized controller set. Finally, the Q-parameters are adjusted online by using a recursive least squares (RLS) adaptive algorithm to eliminate vibration disturbances. Simulation results demonstrate that the hybrid algorithm is capable of effectively suppressing the vibration signals.
Research on cooperative control of vehicle path tracking and lateral stability
Authors: Chen Luran , Liu Zhikun , Yin Dejun 
Published: July 2024

Abstract
This study presents a novel trajectory tracking control approach integrating steering angle and wheel torque output. Unlike conventional hierarchical methods, it considers front wheel steering angle and direct swing torque control simultaneously. Utilizing Model Predictive Control for autonomous vehicles, the system employs path tracking deviation as the state variable, front wheel steering angle, and overall additional yaw moment as control inputs. The coordinated control strategy enhances vehicle stability and contributes to heading angle changes, improving trajectory tracking accuracy. Simulation results in Matlab/Simulink demonstrate the validity and superiority of the proposed method in trajectory tracking and vehicle stability.
Reliability analysis of aerospace planetary roller screw mechanism considering multiple failure modes
Authors: Zhang Ming , Fan Yuanxun , Zhang Changhui , Song Hongzhou 
Published: July 2024

Abstract
Faults in planetary roller screw mechanisms under typical aerospace operating conditions are usually caused by the combined effects of multiple coupled failure modes. Reliability analysis methods that ignore correlation often lead to significant errors. In this paper, the failure models of the planetary roller screw mechanism under fatigue elastic failure, wear failure, and fracture failure are analyzed based on the stress-strength interference model, and failure functional functions are provided. The improved O. Ditlevsen second-order reliability bound theory is used to characterize the relationships between multiple failure modes. Using this method, reliability analysis and calculation of planetary roller screw pairs considering multiple failure modes have been performed, verifying the rationality and effectiveness of this method.
Study on Hot Weather Operation Flight Test of Civil Aircraft Fuel System
Authors: Zhao Shiyang , Ji Kelin 
Published: July 2024

Abstract
As one of the important on-board systems of an airplane, the fuel system of a civil aircraft mainly supplies fuel to the engine and APU of the aircraft, and it is necessary to ensure that the pressure and flow rate of the fuel supply meets the needs of the engine and APU under each kind of probable operating conditions. This paper studies the specific requirements of the airworthiness regulations for the fuel system to work under hot climate conditions. At the same time, it explores how to show the compliance of the fuel system with the airworthiness regulations through the flight test method, which covers the determination of the flight test parameters, the control of the hot fuel temperature, the test modification, the implementation of the flight test mission and the analysis of the results. This paper provides a reference for the implementation of the hot weather operation of similar types of aircraft fuel systems.
Loss model of low pressure compressor for mechanical vapor recompression system
Authors: Le Wang , Pengtao Huang , Jun Xiao , Maofei Geng 
Published: July 2024

Abstract
Low pressure compressor (LPC) serves the role of enhancing pressure levels of secondary steam at nominal pressure ratios (1.5), procured from the evaporator as a primary thermal energy source. A loss model has been proficiently proposed to rapidly predict the performance of the LPC. Instead of conventional lump sum loss equations, the model adopts well-established one-dimensional (1D) loss formulations scattered across scholarly publications. Given an explicit configuration of the LPC, the environmental conditions, rotational velocity, and capacity, static and total temperatures, static and total pressures, pressure reductions, polytropic head, and efficiencies of each individual segment of the compressor can be calculated. Validation of this model was done using computational fluid dynamics (CFD) analysis. This model renders it feasible to conduct a parametric examination of the impact of each loss apparatus on the LPC’s capability, thereby aiding designers in substantiating design choices that minimize these losses and consequently positively influencing the comprehensive efficiency.
Circuit Breaker Fault Diagnosis Method Based on Integrated OCSSA-VMD-CNN-BiLSTM Method
Authors: Liu Wanli , Xu Mingshen , Zhang Jingzhong , Guo Haoxuan , Kang Di , Dou Longjiang 
Published: July 2024

Abstract
The paper proposes a novel approach to diagnose circuit breaker faults by integrating OCSSA, VMD, CNN, and BiLSTM algorithms. Firstly, OCSSA optimizes the parameters of VMD to reduce noise interference. Then, VMD decomposes the circuit breaker operating signals into characteristic signals. Secondly, CNN captures mechanical fault characteristics from the decomposed signals. Finally, BiLSTM applies CNN’s results for feature classification. Experimental results show that combining improved VMD with the CNN-BiLSTM model achieves a fault classification accuracy rate of 99.5%, surpassing other traditional models such as VMD-CNN-BiLSTM and ELMD in accuracy and robustness.
Simulation Study on Defect Damage Behavior of Fe under Irradiation Environment
Authors: Liu Chengwei , Yin Jian , Liu Zekun , Huang Xinming , Wei Shaochong , Zhang Wenli , Wei Pengyu , Zou Yang , Chen Guoxing 
Published: July 2024

Abstract
As a commonly used structural material in nuclear power plants, Reactor pressure vessel (RPV) steel is subjected to high-energy neutron irradiation from the reactor core for a long time, and the service environment is harsh. The accumulation of point defects (interstitial atoms and vacancies) generated by irradiation over a long period can seriously affect the microstructure of the material. The macroscopic properties of the material changed until the material failed, which threatened the safety and operation stability of nuclear power plants. This paper used the method of molecular dynamics to simulate the cascade collision process of Fe in the irradiation environment. The relationship between different factors and radiation damage defects was studied. Firstly, the quantity of the Frenkel pairs increases rapidly in the irradiation environment, and then recombination occurs after reaching the peak, which makes the quantity of the Frenkel pairs decrease rapidly. Finally, the quantity of Frenkel pairs is in a stable trend. When PKA energy and temperature increase, the higher the quantity of Frenkel pairs at the peak is, the higher the recombination rate of defects is. Meanwhile, the larger the cluster size of interstitial atoms and vacancies is, the greater the corresponding quantity of clusters is. As PKA energy increases, the quantity of residual Frenkel pairs at stability increases, while the number of residual Frenkel pairs at stability decreases with temperature. This is attributed to the intense thermal motion of molecules at high temperatures, resulting in the quantity of Frenkel pairs decreasing at the stable stage. Therefore, by simulating the irradiation damage process of Fe, the prediction of material irradiation damage under a neutron irradiation environment is provided, and the service life of materials can be provided with theoretical guidance.
Construction and Experimental Research of Active Vibration Control System of Voice Coil Motor with Integral Acceleration Feedback
Authors: Pu Huayan , Xiong Jing , Wang Min 
Published: July 2024

Abstract
The skyhook control technology is widely used in active vibration isolation and has proven effective. However, the absolute speed sensor used in the skyhook control technology is easily affected by external factors and may be easily damaged. There are few application scenarios for the skyhook control technology. To overcome this limitation, a brand-new approach is proposed for the design of an isolator that involves a voice coil motor (VCM) and an accelerometer. First of all, the proposed structure is introduced, and the dynamic model is established to achieve an analytical solution. Then, an integral acceleration feedback (IAF) algorithm is introduced and simulations are carried out. Finally, a prototype is constructed to verify its vibration isolation performance. From the experimental results, it can be concluded that the proposed active vibration control system (AVCS) can effectively reduce the peak value near the natural frequency, with a peak value reduction of 14.77 dB. Compared with the simulation results, the peak change rate at 12.5 Hz is 3.92%. AVCS with IAF can be applied to more application scenarios with a similar isolation effect to skyhook control technology.