bluuebunny/crossref_metadata_2025_split huggingface dataset:
Correction of microwave pulse reflection by digital filters in superconducting quantum circuits
Authors: Guo 郭 Liang-Liang 亮亮 , Duan 段 Peng 鹏 , Du 杜 Lei 磊 , Zhang 张 Hai-Feng 海峰 , Tao 陶 Hao-Ran 浩然 , Chen 陈 Yong 勇 , Yang 杨 Xiao-Yan 小燕 , Zhang 张 Chi 驰 , Jia 贾 Zhi-Long 志龙 , Kong 孔 Wei-Cheng 伟成 , Chen 陈 Zhao-Yun 昭昀 , Guo 郭 Guo-Ping 国平 
Published: July 2024

Abstract
Reducing the control error is vital for high-fidelity digital and analog quantum operations. In superconducting circuits, one disagreeable error arises from the reflection of microwave signals due to impedance mismatch in the control chain. Here, we demonstrate a reflection cancelation method when considering that there are two reflection nodes on the control line. We propose to generate the pre-distortion pulse by passing the envelopes of the microwave signal through digital filters, which enables real-time reflection correction when integrated into the field-programmable gate array (FPGA). We achieve a reduction of single-qubit gate infidelity from 0.67% to 0.11% after eliminating microwave reflection. Real-time correction of microwave reflection paves the way for precise control and manipulation of the qubit state and would ultimately enhance the performance of algorithms and simulations executed on quantum processors.
Origin of the up/down poloidal asymmetric dependence of ELM control in ITER-like RMP configuration in KSTAR
Authors: Choi Inhwan , Liu Yueqiang , In Yongkyoon 
Published: July 2024

Abstract
Recent edge-localized modes (ELM) control experiments via resonant magnetic perturbation (RMP) in KSTAR have shown a strong up/down poloidal asymmetric coupling dependence. Specifically, in lower single null (LSN) plasmas at q95

≳

5, the lower two-row (middle/bottom) RMPs among ITER-like three-row (top/middle/bottom) in-vessel control coils (IVCC) in KSTAR were more effective in suppressing ELM-crashes than the upper two-row (top/middle) RMPs. In contrast, at q
95 ∼ 4, the upper two-row RMPs turned out to be more effective than the lower counterpart. Since the ITER baseline scenario is planned to operate at q
95 ∼ 3, the understanding of the origin of such up/down poloidal asymmetric coupling dependence, as well as the prediction about ITER-relevant conditions at a lower q
95, would be quite important and potentially impactful to the RMP ELM control in ITER. A linear, resistive, single-fluid MHD code MARS-F has been utilized to address and model the up/down poloidal asymmetric RMP coupling dependence. Specifically, based on two contrasting exemplary discharges with up/down poloidal (i) asymmetric at q
95 ∼ 4 and (ii) symmetric behavior at q
95 ∼ 5, among tens of otherwise similar discharges, a systematic MARS-F modeling has been thoroughly conducted. As a result, the plasma response investigation suggests that the X-point displacement (ξ
X), rather than any other figures of merit, would be a directly relevant metric for the up/down poloidal asymmetric coupling in RMP-driven, ELM-crash suppression in KSTAR. Based on a sensitivity study of the edge safety factor in MARS-F modeling, the ξ
X variation follows the same quantitative trend as observed in experiments. However, no or little plasma pressure dependence has been found, though ξ
X increases with plasma pressure. At the ITER-relevant low q
95 ∼ 3 in a scaled KSTAR equilibrium, such modeling predicts the upper two-row RMPs would be more favorable in suppressing the ELM-crashes than the lower counterpart.
Facilitated core-edge integration through divertor nitrogen seeding in the HL-2A tokamak
Authors: Wu N. , Cheng J. , Yi K.Y. , Wang R. , Han M.K. , Huang Z.H. , Wang W.C. , He Y. , Yan L.W. , Du H.L. , Gao J.M. , Ma H.C. , He X.X. , Yang Z.C. , Wen J. , Zhang K. , Wu T. , Guo W.P. , Yu X. , Liu L. , Li Y.G. , Nie L. , Shi Z.B. , Wang D.Z. , Zhong W.L. 
Published: July 2024

Abstract
A divertor detachment with sustainable high-performance plasmas has been achieved through divertor nitrogen seeding in the HL-2A tokamak. The closed divertor structure facilitates achieving high divertor neutral pressure due to its efficient particle containment effect as demonstrated by both experimental and SOLPS simulation results, which aids in achieving the divertor detachment. The radiative divertor is conducive to high-frequency small edge localized modes (ELMs) operation, characterized by a reduced pedestal ion temperature gradient

∇

T

i

and the enhanced electron density gradient

∇

n

e

. The presence of minority nitrogen at the edge plasma, which results from the divertor nitrogen seeding, contributes to the increase of ion temperature

T

i

in the confinement region by suppressing the turbulence through the impurity dilution effect and

E

×

B

shear. The increased ion temperature

T

i

and electron density

n
e

compensate the energy loss resulting from the increased edge radiation during detachment, which contributes to the confinement sustainment combined with reduced pedestal energy loss caused by small ELMs. This work advances our understanding of the fundamental physics governing closed divertor detachment with sustainable high-performance plasmas through divertor nitrogen seeding.
A high-gain high-drive operational amplifier
Authors: Ma Jintao , Liang Jinhui , Li Yanling , He Jiangping 
Published: July 2024

Abstract
This paper presents a high-gain, high-drive operational amplifier based on the 0.18 μm technology. The first stage employs a current-reuse common-source common-gate structure to enhance gain, while the second stage utilizes a transconductance-enhanced push-pull output stage. This design achieves high-drive performance while retaining a high gain. Simulation using Cadence software demonstrates that, under a 5 V power supply voltage, the amplifier exhibits a low-frequency gain of 120 dB, with output sink and source current capabilities reaching 17.7 mA and 2.53 mA, respectively.
Research on Extrusion Forming Process of Micro Internal Thread for Nickel-plated Aluminum Alloy Parts
Authors: Shen Tao , Yang Zaibin , Zhang Liu 
Published: July 2024

Abstract
With the development of electronic products in the direction of miniaturization and lightweight, the specifications of thread gradually become minor, and the high-precision forming of micro threads has become an urgent problem to be solved. In this paper, the extrusion forming process of the micro internal thread was mainly studied on the nickel-plated aluminum alloy parts. The process route suitable for the internal thread forming on electroplated parts was designed, and the key parameters of thread bottom hole diameter and thread tapping speed were determined by experiment. Aiming at the typical problem of internal thread blocked by a broken tap, a thread repair method based on laser ablation was proposed and the laser processing parameters were optimized. Eventually, the manufacturing of M1 micro internal thread on nickel-plated aluminum alloy parts was successfully realized.
A novel gain boost and slew rate enhanced CMOTA
Authors: Zhou Qiang , Ma Jintao , Li Yanling , He Jiangping 
Published: July 2024

Abstract
The design of a novel current mirror operational transconductance amplifier is proposed to address the issues of low gain and limited swing rate under conditions of low voltage and power consumption. In order to improve the gain and swing rate of the amplifier, the increase and lift technology and swing rate increase technology are introduced to the traditional op-amp Simulation and verification based on 0.18 μm BCD process and candence. The results show that under 10 pF load capacitance, the gain is increased by 42 dB and the swing rate is increased by 130 times compared with the conventional transconductance op amp.
Axial flow impeller design and simulation for negative pressure adsorption climbing robot
Authors: Li Mingqiang , Yin Chenggang 
Published: July 2024

Abstract
Axial flow impeller is broadly applied in negative pressure adsorption climbing robots, but its design method and procedure are rarely reported. This paper used a wind turbine blade climbing NDT robot as case study, presented a comprehensive design process of the axial flow impeller, and evaluated the adsorption performance of the impeller by carrying out simulation experiments. Firstly, analysing the force equilibrium of the robot and determining minimum adsorption force required by the robot. Secondly, defining design parameters of the axial flow impeller by using fluid dynamics analysis method. Thirdly, specifying structural parameters of the impeller blades using impeller design theory and developing the CAD model of the impeller. Finally, evaluating the adsorption performance of the impeller by carrying out a series of Fluent simulation experiments. Research results showed that the total adsorption force of the impeller reached 80.30N as rotational speed is 6000rpm, which satisfied design requirements of the climbing robot. This research provides a methodological framework in designing axial flow impellers for the purpose of negative pressure adsorption.
Design of clean energy based microplastic collection device
Authors: Xiong Zhenxi , Luo Yuanming , Wang Kunyang 
Published: July 2024

Abstract
Microplastics are plastic particles with a particle size of less than 5 mm formed after the degradation of plastic by crushing. Microplastics are chemically stable and difficult to degrade, and they are also enriched with chemical poisons, microorganisms, and pathogenic bacteria[1]. Some microplastics migrate with ocean currents in the ocean, affecting the global distribution of pollution and causing great harm to the stability of marine ecosystems and the marine environment. There are a large number of microplastics in the ocean, and the number is increasing[2][3]. In order to realize the microplastic collection function, a microplastic collection device was designed to reduce operational requirements and costs while realizing microplastic salvage. The overall scheme of the system includes the design of subsystems consisting of a solar power generator, a collection mechanism, a filtration device, a buoyancy device, a lighthouse, an anchor device, and so on. According to the actual needs of the microplastic collection, the mechanical structure and dimensions of each subsystem were designed, the 3D modeling of the overall system was completed using SolidWorks, and a physical model of the microplastic collection device was produced for experimental testing.
Simulation for fuselage section with dummies and seats under crash environment
Authors: Zou Jiansheng 
Published: July 2024

Abstract
A numerical model of a commercial fuselage section with dummies and seats under a crash environment was investigated to evaluate the dynamic responses of occupants. Firstly, the two dynamic tests about seats and occupants restraint system were performed to meet the requirements specified by CCAR-25, including the tension loads in straps and the head injury criterion, and gained a method for simulation on seats and occupants restraint system. Secondly, the detail fuselage FE model was built to compare different vertical velocities; the results showed that the greater the velocity is, the more violently the dummies moved, while the deformation of structures had no difference.
Defect identification method for stainless steel welded pipes based on eddy current testing
Authors: Zhang Hengxi , Li Shengtao , Wu Tinghui , An Yuxiang 
Published: July 2024

Abstract
A defect identification and classification method for 316 stainless steel welded pipes is proposed based on eddy current testing technology. Initially, this approach acquires eddy current signals from steel pipes, applies Empirical Mode Decomposition (EMD) to derive Intrinsic Mode Functions (IMFs), chooses the principal IMF based on interrelationships, and extracts time-frequency domain characteristic parameters from the selected IMF. To enhance model recognition efficiency, Principal Component Analysis (PCA) is employed to reduce the dimensionality of the feature vector set. Ultimately, a Support Vector Machine (SVM) is utilized to identify and classify weld defects. The results indicate that this method is highly accurate in identifying defects in 316 stainless steel welded pipes.
Crack initiation life of aviation gear pair
Authors: Liu Yixian , Lin Tengjiao , Chen Bingkui 
Published: July 2024

Abstract
The gear transmission system is an important part of the aero-engine. The most serious fault is tooth root fatigue fracture. This paper mainly discusses the time of fatigue crack initiation stage of aviation gear tooth root position. The crack initiation state can be evaluated by analyzing the root stress. The static contact analysis is solved by using the generated aviation gear pair model. The maximum stress in the bending direction of gear teeth is calculated. The changing pattern of tooth root stress with meshing position is described in detail. According to the multi-axial stress fatigue theory, the surface damage parameters and fatigue life of the gear tooth root position are calculated, and the location of the crack initiation is obtained. Fatigue cracks often appear at half of the gear tooth width and near the tooth root circle.
Maximum Torque Control of Permanent Magnet-Assisted Synchronous Reluctance Motor Using Fuzzy PI
Authors: Wang Fukuan , Sun Baojiang 
Published: July 2024

Abstract
This paper proposes a fuzzy PI-based Maximum Torque Per Ampere (MTPA) control for Permanent Magnet-Assisted Synchronous Reluctance Motor (PMASynRM). The aim is to address issues such as overshooting and slow response in the operation of the PMASynRM by optimizing MTPA control under traditional PI using a fuzzy PI control algorithm. This approach enhances the system’s responsiveness and disturbance rejection capabilities. The article builds a simulation model for the maximum torque-to-current ratio control of PMASynRM using fuzzy PI control in MATLAB/Simulink, comparing it with traditional PI control. Simulation results indicate that the fuzzy PI motor control system exhibits lower overshoot, faster response speed, and better robustness compared to traditional PI control.
Analysis of Automotive Smoothness Driven by Wheel Hub Motors with Different Configuration under Dual Excitation
Authors: Lin Yumeng , Zhao Haijun , Wang Feng , Wang Xulong 
Published: July 2024

Abstract
In response to the smoothness issue of wheel hub motor driven vehicles, electromagnetic vertical excitation was added on the basis of road excitation, and the noise source of a three-phase 8-pole 48-slot permanent magnet motor was investigated in the frequency domain; A 1/4 vehicle 2-DOF vertical vibration system model with three suspension configurations under dual excitation was established, and the vehicle smoothness problem was analyzed from a time domain perspective. The results show that the overall trend of the response values of each evaluation indicator under dual coupling excitation is correspondingly higher than that under single excitation. Under dual excitation, the suspension configuration of absorber type exhibits the smallest maximum variation in the vertical acceleration response of the vehicle over time compared to the distributed and isolated suspension configurations.
Research on Parameter Identification of Induction Motor Based on Model Reference Adaptive System
Authors: Wu Qize , Wang Chenyu , Zhao Jiayi , Hu Jiaxing , An Xue , Huan Xingzhong , Yang Shuang 
Published: July 2024

Abstract
This paper proposes a novel online parameter identification method based on model-reference adaptive systems to achieve more precise control of induction motors. This method efficiently and accurately obtains the parameters of induction motors during operation, facilitating effective control. Experimental validation is conducted on a hardware-in-the-loop test platform, demonstrating that the proposed online parameter identification method for induction motors achieves accurate parameter estimation with the advantages of high identification speed and precision. Control experiments on induction motors using the identified parameters further validate the feasibility of the proposed method for online parameter identification.
Reliability Evaluation of Distribution Networks Considering Natural Gas Network Integration
Authors: Zhang Guozheng , Wang Yong , Wu Wei , Zhang Peiyue 
Published: July 2024

Abstract
With the transformation of energy structure, the distribution network in the form of multi-energy interconnection is gradually emphasized. The access of gas turbines to the distribution network puts high requirements on the reliability assessment of the distribution network counting and natural gas network access. Models of distribution network components and natural gas network equipment are established. Based on the traditional sequential MC reliability assessment, the calculation of reliability indexes for the distribution network with gas turbine access is accomplished by identifying the islanded areas under fault conditions and judging the gas turbine output state, taking into account the energy flow constraints. The results of the calculations show that the reliability of the distribution network with natural gas network access is improved, and the reliability of the load nodes near the gas turbine is improved significantly.
Real-time monitoring method for power system voltage based on optical voltage sensors
Authors: Zhou Lifu , Wu Guoxing , He Zhenhua , Zheng Qingmeng , Zhu Ruichao , Zhong Tianyong 
Published: July 2024

Abstract
A real-time monitoring method for power system voltage based on optical voltage sensors is proposed to obtain transient voltage signals and achieve real-time tracking of instantaneous changes in electrical parameters of the power system accurately and effectively. Analyzing the topology principle of power system transformers clarifies the installation location of optical voltage sensors. By combining the measurement principle of optical voltage sensors, the electrical, optical modulation, and optical-electrical conversion of voltage signals are achieved, and the voltage signal of the power system is output. Using the short-time Fourier transform method to perform temporal processing on the output signal and obtaining a voltage signal sliding window based on wavelet packet decomposition, we set the normal range threshold of the voltage signal in the sliding window, combined with information entropy theory to extract key features of the voltage signal and achieve real-time monitoring of the power system voltage. The experimental results show that the proposed method can effectively obtain transient voltage signals of the power system, with an average detection accuracy of 92.61%, and the output voltage can be adjusted promptly to reflect the instantaneous changes in the power system voltage.
Risk Assessment and Analysis of New Power System Operation Under Extreme Disasters
Authors: Wu Hao , Zhang Yanchi , Shao Guangyi , Wei Qing , Wu Qian 
Published: July 2024

Abstract
In recent years, new power systems have been developing continuously, and the operational risk assessment of new power systems under extreme disaster conditions has attracted much attention. This paper uses Latin hypercube sampling technology to establish a power system failure model under extreme disasters and proposes a new power system risk assessment method that applies the power system power flow model to establish a comprehensive system risk index. In addition, taking the power grid of a certain province in eastern China as an example, a case analysis is conducted on the IEEE39 node system to verify the effectiveness of the method.
A high-precision hazard ranging method for transmission lines based on laser point cloud
Authors: Liu Jing , Cai Fudong , Cao Songyuan , Xia Lingzhi , Kong Zhiqiang , Liu Wei , Zhang Mingxiang , Cheng Yang , Liu Xiaoqing , Wang Chaohui 
Published: July 2024

Abstract
To ensure the safe operation of the line, it is necessary to discover the hidden danger in time and accurately. This paper proposes a high-precision hidden danger-ranging method for transmission lines based on the laser point cloud. This method uses LiDAR to form a data acquisition system, which is installed in the fixed position of the transmission line channel power tower to obtain the point cloud data of the channel field at regular intervals, according to a certain rule. Two ends of the suspension points and some of the conductor point cloud data are used to fit the whole conductor in three-dimensional space and carry out the precise hidden danger ranging through the fitted conductor combined with the point cloud data and ranging. By comparing the original conductor point cloud data with the fitted conductor data to verify the reliability of the conductor fitting, and verifying the feasibility of the conductor arc prolapse measurement method based on the measured arc prolapse of the conductor and the distance to the ground, it can provide more timely and effective early warning information for the safety of the transmission line channel.
Particle size distribution of two-phase medium measured by ultrasonic wave
Authors: An Yuxiang , Hou Huaishu , Li Shengtao 
Published: July 2024

Abstract
Measurement of ultrasonic attenuation spectra of particle suspensions using a variable acoustic range approach is introduced. This study is based on the improved ECAH model. In this paper, an experimental test was performed on an emulsion with a concentration of 15%. Then, the NNLS algorithm is used for inversion calculations. Compared with laser particle size meter results, the measurement results are in good agreement.
A Transient-Enhanced Capacitorless LDO Design
Authors: Liang Jinhui , Zhou Qiang , Chen Haichuan 
Published: July 2024

Abstract
This paper introduces a capacitor-less low drop-out voltage regulator (LDO) designed for fast transient response. Traditional capacitor-less LDOs often suffer from suboptimal transient responses, leading to unstable outputs during load transitions. To address this challenge, the circuit employs voltage rise and fall suppression circuits to mitigate voltage spikes. It utilizes slew rate enhancement techniques to improve the transient response characteristics of the LDO. Miller compensation is applied to achieve phase margin compensation with a smaller capacitor area. Simulation outcomes indicate that within the voltage range of 2.2 V to 3.3 V, the circuit provides a stable output voltage of 1.8 V while accommodating a peak load current of 100 mA. When the load current undergoes a step change between 1 mA and 100 mA, the transient enhancement circuit reduces the undershoot of the output voltage by 58 mV, a decrease of 39%, with a response time of 1.13 μs. The overshoot amplitude is reduced by 212 mV, a decrease of 70.6%, with a response time of 1.21 μs.
Modeling and prediction of degradation induced by light on monocrystalline silicon solar cell
Authors: Li Hailing , Li Wenhao , He Mengyuan , Zhao Wanying 
Published: July 2024

Abstract
In this work, the qualitative and quantitative study of degradation extent caused by LeTID on monocrystalline silicon solar cells under different treatment temperatures and irradiance intensities is carried out. A mathematical model of the relationship between the degradation temperature and irradiance intensity is established. The concept of equivalent temperature and equivalent irradiance intensity is introduced to establish the relationship between the constant temperature and irradiance in the laboratory and the changing temperature and irradiance outdoors, and the outdoor degradation prediction of LeTID of monocrystalline silicon cells is realized. Using this model can help the PV industry to predict the outdoor long-term performance of PERC solar cells.