bluuebunny/crossref_metadata_2025_split huggingface dataset:
Does Voicing Affect Patterns of Transfer in Nonnative Cluster Learning?
Authors: Cheng Hung-Shao , Buchwald Adam 
Published: April 2021

PurposePrevious studies have demonstrated that speakers can learn novel speech sequences, although the content and specificity of the learned speech motor representations remain incompletely understood. We investigated these representations by examining transfer of learning in the context of nonnative consonant clusters. Specifically, we investigated whether American English speakers who learn to produce either voiced or voiceless stop–stop clusters (e.g., /gd/ or /kt/) exhibit transfer to the other voicing pattern.MethodEach participant (n= 34) was trained on disyllabic nonwords beginning with either voiced (/gd/, /db/, /gb/) or voiceless (/kt/, /kp/, /tp/) onset consonant clusters (e.g., /gdimu/, /ktaksnæm/) in a practice-based speech motor learning paradigm. All participants were tested on both voiced and voiceless clusters at baseline (prior to practice) and in two retention sessions (20 min and 2 days after practice). We compared changes in cluster accuracy and burst-to-burst duration between baseline and each retention session to evaluate learning (performance on the trained clusters) and transfer (performance on the untrained clusters).ResultsParticipants in both training conditions improved with respect to cluster accuracy and burst-to-burst duration for the clusters they practiced on. A bidirectional transfer pattern was found, such that participants also improved the cluster accuracy and burst-to-burst duration for the clusters with the other untrained voicing pattern. Post hoc analyses also revealed that improvement in the production of untrained stop–fricative clusters that originally were added as filler items.ConclusionOur findings suggest the learned speech motor representations may encode the information about the coordination of oral articulators for stop–stop clusters independently from information about the coordination of oral and laryngeal articulators.
Manipulating Berry curvature of SrRuO3thin films via epitaxial strain
Authors: Tian Di , Liu Zhiwei , Shen Shengchun , Li Zhuolu , Zhou Yu , Liu Hongquan , Chen Hanghui , Yu Pu 
Published: April 2021

SignificanceBerry phase and Berry curvature contribute significantly to a large collection of intriguing properties in quantum materials, particularly intrinsic anomalous Hall effect (AHE). One of the central steps is to explore the evolution of Berry curvature and related properties under external stimulus. Here, we report that the epitaxial strain effectively tunes the Berry curvature and the magnitude and sign of corresponding intrinsic AHE in SrRuO3films, which are due to modification of electronic structures induced by strain. We further reveal the Berry curvature can also be modulated with the rotation of magnetization, resulting in an exotic nonmonotonic change of anomalous Hall resistively. Our findings suggest that epitaxial strain provides a nice approach for manipulating Berry curvature and its related physics.
Effects of chronic dietary grape seed extract supplementation on aortic stiffness and hemodynamic responses in obese/overweight males during submaximal exercise
Authors: Dillon Katherine , Shariffi Brian , Gillum Trevor , Boyer William , Sullivan Sean , Kim Jong‐Kyung 
Published: April 2021

ABSTRACTWe investigated the effect of chronic grape seed extract (GSE) on blood pressure and aortic stiffness (AoS) among overweight and obese males. Systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), heart rate (HR), stroke volume (SV), cardiac output (Q), total vascular conductance (TVC), and AoS were measured during two submaximal cycling exercises (40% and 60% VO2max), after 7 consecutive days of GSE or placebo (PL) ingestion with one week washout period. Compared with PL, GSE supplementation significantly decreased MAP at rest (85 ± 3 mmHg vs. 82 ± 3 mmHg), 40% (102 ± 3 mmHg vs. 99 ± 3 mmHg), and 60% workloads (109 ± 3 mmHg vs. 107 ± 3 mmHg) (P = 0.001, ES = 0.2). AoS was significantly reduced (13.0 ± 1.9 AU vs. 10.2 ± 1.0 AU) at rest (P = 0.002, ES = 0.6). Q was decreased at rest and across all workloads, but there were no significant differences (7.5 ± 0.4 L/min vs. 7.1 ± 0.4 L/min; 20.4 ± 1.2 L/min vs. 19.6 ± 0.9 L/min; 26.3 ± 1.1 L/min vs. 25.5 ± 1.6 L/min, respectively). GSE had no effect on HR, TVC, and SV. Our study indicates that chronic supplementation with GSE reduces arterial pressure at rest and during exercise primarily via the substantial reduction in AoS. Thus, GSE can be a dietary supplement to treat augmented blood pressure responses in obese and overweight males at rest and during exercise.Trial registration: ClinicalTrials.gov identifier: NCT04465110.
A new method for measuring complex relative permittivity of dielectric material by reflection method
Authors: Qin Yao , Wei Bin , Liu Shuo , Li Mingxing , Cai Chengxin , Hou Tiangang 
Published: April 2021

Abstract
In this paper, a new lossless free space method for measuring the complex relative permittivity of dielectric material by reflection method is presented. When this method is used to measure the complex relative permittivity of dielectric material, there is no multi-value problem. The measurement system used in this method consists of a horn lens antenna and a vector network analyzer(VNA). In this paper, HFSS microwave simulation software is used to simulate the complex relative permittivity measurement method proposed in this paper. The simulation results show that this method can accurately measure the complex relative permittivity of dielectric material.
Numerical simulation study of free space method for measuring sample permittivity
Authors: Qin Yao , Liu Shuo , Wei Bin , Li Mingxing , Cai Chengxin , Hou Tiangang 
Published: April 2021

Abstract
The composition and performance of the material can be expressed by the permittivity. The paper introduces the measurement principle of free space method and TRL calibration principle, the calculation formula of the sample permittivity is theoretically analysed, a horn lens antenna is designed to simulate the emission of plane waves, and numerical simulation software is used for simulation and optimization. In the working frequency range, the voltage standing wave ratio of the antenna is less than 1.49, and the maximum gain is 21.8dB. A free space measurement system is established in the software to measure the sample permittivity with different thicknesses, and compare the calculated value with the actual value. The results show that the root mean square error of the real part is less than 5.3%, and the root mean square error of the imaginary part is less than 1.3%. The correctness and applicability of the formula for calculating the permittivity are also proved.
Optimal economic dispatch of microgrid based on chaos map adaptive annealing particle swarm optimization algorithm
Authors: Dai Xufan , Lu Kui , Song Dan , Zhu Zheng , Zhang Yongle 
Published: April 2021

Abstract
This paper adds chaos optimization based on adaptive annealing particle swarm optimization algorithm, which improves the global convergence ability and makes up for the shortcomings of traditional PSO algorithm, which is easy to fall into local optimization in addition, this paper adds simulated annealing operator, improving the diversity of better population. In addition, the micro source of microgrid is modeled, and the constraints of the model are set. The fitness of the optimized algorithm is compared with the traditional algorithm, and the objective function involved in microgrid dispatching is taken as the application layer. Finally, through data analysis, the effectiveness of the optimization algorithm for microgrid optimal economic dispatching is confirmed.
The research on notch filtering and spectral filling for RFI suppression
Authors: He Yinguang , Gao Fei , Gong Ziyi , Dang Hongxing , Tan Xiaomin 
Published: April 2021

Abstract
Radio frequency interference (RFI) suppression has become an essential step in synthetic aperture radar (SAR) imaging processing. In this paper, a spectral filling filtering method for RFI suppression referred to notch filter is derived and analysed. The derivation results show the reason for the “residual terms” after suppression processing in frequency domain and the influence of the “residual terms”. And a conclusion is drawn: the essence of interference suppression based on spectral filling filter is the dynamic change process of “residual terms”. Since they cannot be completely eliminated in theory, they will affect the image quality after interference suppression, but the effect of spectral filling method is better than that of the notch filter method. The conclusion is verified by the simulation experiment.
Torque ripple minimization for PMSM considering harmonic magnet flux phase
Authors: Guo Honghao , Cao Rui , Lin Xinxin 
Published: April 2021

Abstract
Due to the existence of cogging torque, magnet flux harmonics and inverter dead time, permanent magnet synchronous motor (PMSM) has torque ripple during operation, which limits its application in high-precision situations. Stator current optimization is an easy-to-apply and accurate torque ripple suppression approach. However, existing methods fail to consider the effect of magenet flux phase angle on optimal current calculation. In this paper, a torque ripple minimization method considering harmonic magnet flux phase is presented, which uses torque waveform of an electric angular period as the optimization object. By deducing the electromagnetic torque model considering harmonic magnet flux, the torque is expressed as a dense sequence. Based on this, the objective function including torque ripple and losses minimization is constructed and optimized by genetic algorithm (GA) to obtain the optimal harmonic current. Experiment results show that the proposed approach can calculate the optimal harmonic current accurately and suppress the torque ripple effectively.
Research on live detection technology of cable joint defects based on high-speed light sensing and pressure wave method
Authors: Zhaoguo Wu , Weisheng He , Haibing Zhang , Bangfei Deng , Qian Wang , Hong Xiang , Zhaoguo Wu 
Published: April 2021

Abstract
With the widespread application of stable high-voltage power cables, cable failures have gradually become the main source of major accidents in the process of power transmission. The most easily damaged part is the cable joint. Since the cable joints are made on site, it is easy to introduce high-voltage cable defects and cause insulation failures. Therefore, the defect detection of high-voltage voltage joints is particularly important. In order to promote the process of urbanization, ensure people’s life quality and personal safety, the popularization of high-voltage cables is an inevitable trend. However, difficulties will be encountered in the detection of cable joint faults. To improve the detection efficiency, relatively extensive research has been carried out on the detection of high-voltage cable joints at home and abroad. Based on the high-speed light sensing and pressure wave method, the online detection method of cable joint defects proposed in this paper has accurate, fast, convenient and non-contact online detection features.
Analysis of Practical Application of PLC Technology in Electric Automation
Authors: Zhao Guohua , Zheng Hui 
Published: April 2021

Abstract
With the continuous development of science and technology, PLC technology has been applied in many industries. This also includes electrical automation control, which can better maintain the accuracy and stability of electrical automation control, and its development prospects are very broad. This article summarizes the application significance and advantages of PC technology in electrical automation control based on previous work experience. The author discusses the practical application of PLC technology in electrical automation from six aspects: air conditioning, coal mining, numerical control, transportation, power systems, and lathe electrical control systems.
Risk Assessment of Power Systems Considering CVaR
Authors: Yu Jin , Wang Xingang , Yu Zhongping , Xi Dongsheng , Chen Mengdi 
Published: April 2021

Abstract
In view of the randomness of component fault and load, considering the deficiency of traditional single reliability index, this paper introduces the Conditional Value-at-risk method based on Monte Carlo simulation, and constructs the probability model of risk assessment considering the forced outage rate of unit and line. In order to quantify uncertainty caused by random factors, the value-at-risk and conditional value-at-risk of power system security was proposed and used as a grid security index in the model combined with reliability index, which can accurately describe secure operation level in power system under different operation parameters, and reflect the severity of the accident and weakness and the grid, for further research on safe operation of power system to offer reference and decision-making basis.
A single-winding BSRMWR direct instantaneous torque control and direct levitation force control method
Authors: Xiang Yu , Yang Yan , Liu Chengzi , Liu Zeyuan 
Published: April 2021

Abstract
The stator and rotor of the bearingless switched reluctance motor are both double salient pole structures, when the traditional current chopping control method is used, the torque and levitation force of the motor will have large fluctuations. To solve this problem, this paper studies a direct instantaneous torque control and direct levitation force control (DITC&DFC) method suitable for single-winding bearingless switched reluctance motors. This method takes the instantaneous torque and the instantaneous levitation force of the motor as the directly controlled object, eliminates the current loop, and simplifies the control algorithm while suppressing the fluctuation of the motor torque and levitation force. A 12/8-pole singlewinding bearingless switched reluctance motor with wide rotor teeth drive system is constructed, the Matlab/Simulink system simulation verifies the effectiveness and feasibility of the method.
Soft Start Strategy of Power Electronic Transformer based on Energy Feedback
Authors: Yu Jimin , Nie Chuanjie , Xiong Fei 
Published: April 2021

Abstract
There are a large number of capacitors in power electronic transformer (PET). If PET is started by conventional closed-loop control directly to establish DC capacitor voltage, the over-current that may lead to device damage may be caused. To solve this problem, a soft start strategy of PET based on energy feedback is proposed. In this strategy, the DC capacity of the low voltage side is moderately overcharged at first, and then part of the energy is fed back to the high voltage side to make the voltage of the high voltage DC side reach the reference value. Finally, the CHB is allowed to enter the closed-loop control, thus completely eliminating the impulse current of the AC side. This method avoids the complex parameter design process, and completely relies on the theoretical model rather than experience to guide the design of the process of soft start. Simulation results verify the feasibility and effectiveness of the proposed method.
Research on current harmonic suppression of PMSM based on mathematical morphology
Authors: Cheng Zhihua , Kan Kun 
Published: April 2021

Abstract
Due to the existence of power converter dead time, flux harmonics and other nonlinear factors, the motor phase current contains a large number of high-order harmonics, so the electromagnetic torque generated by the interaction of current and flux also contains various orders of harmonics. In order to eliminate current harmonics, mathematical morphology filter is proposed to suppress current harmonics. However, the single-scale morphological filtering has shortcomings in preserving information details. In order to make up for the deficiency of the traditional single-scale morphological filtering in preserving information details, a weighted multi-scale mathematical morphology method is proposed to suppress the current harmonics.
New feed-forward control strategy of single-phase grid-connected inverter
Authors: Cao Ziheng , Zhou Shaoping , Wu Di 
Published: April 2021

Abstract
Traditional proportional feed-forward strategy can well restrain harmonic disturbance from grid background, but in the weak grid, positive feedback channel and grid-connected current inner-loop are coupling with each other by grid impedance, and robustness is substantially decreased. According to the above situation, a kind of new feed-forward control strategy is proposed, and adding more resonant link on positive feedback channel of point of common coupling voltage to change full pass characteristics of positive feedback channel which only make positive feedback channel have feedback effect on the frequency of main grid background harmonics. Inverter can both have great robustness and harmonic suppression ability in weak grid. In the end, the effectiveness and correctness of proposed control strategy is verified by the simulation model of single-phase grid-connected inverter.
Development of integrated spectral sun-photometer based on embedded Linux OS
Authors: Zhaoyang Qi , Fengying Sun , Jianyu Li , Wenyue Zhu , Wenqing Xu , Gang Xu , Yao Huang 
Published: April 2021

AbstractAccurate detection of solar irradiance has important application value for theoretical research on climate change and atmospheric analysis, so this paper proposes the integrated spectral sun-photometer to enrich methods of obtaining the solar irradiance and entire atmospheric transmittance. With the ARM microprocessor as central processing unit and Linux OS as the software platform, the two-dimensional turntable and grating spectrometer are combined to construct sun-photometer which can measure continuous wavebands. This article advances the solution scheme to realize data transmission between microcontroller and turntable through CANopen communication. Meanwhile, the spectrometer based on USB communication protocol is used to obtain spectrum from visible to near-infrared band. In addition, both the multiple task operating system Linux and application framework Qt are employed to design friendly user-interface and display real-time process images, which would simplify and integrate the solar radiometer. After Langley calibration is used to calculate the constants to achieve calibration of instrument in spectral band, measured data of the radiometer and results of the DTF solar radiometer are compared and analysed, which confirms the reliability of integrated sun-photometer.
Differential evolution algorithm based on entropy weight method to determine the weight to optimize the configuration of wind, solar, and diesel microgrid
Authors: Xing Yongchen , Duan Qing , Zhang Guobao , Ma Chunyan , Liu Wen Long 
Published: April 2021

Abstract
In order to enhance the stable operation of the multi-energy complementary microgrid for wind, solar, and diesel storage, reduce operating costs, and solve the problems of large randomness, low accuracy, and slow convergence of traditional microgrid optimization multi-objective decision-making, a differential evolution based on the entropy weight method to determine the weight is proposed. Firstly, we establish a microgrid integrated energy model from the perspectives of system operation stability, economy and environmental protection; combined with the Pareto optimal solution set, multi-objectives are weighted according to the entropy weight method, and the multi-objective optimization problem is transformed into single-objective optimization The problem is to avoid artificial setting of weight factors; the calculation example shows that this method is more economical and reasonable in optimization results, and provides an economic, reliable and environmentally friendly microgrid configuration strategy for users to increase power capacity.
Research on Information Coding of Smart Substation Facing “Two Networks Convergence”
Authors: Chen Pan , Xiao ZhiHong , Yan Peili , Feng Teng , Wang Xiaoming , Wang Liang 
Published: April 2021

Abstract
With the popularization and application of “Internet of Things” technologies such as equipment online monitoring and intelligent inspection in the field of substation operation and maintenance, the number of subsystems in smart substations has increased rapidly, and the types of information and the amount of information have shown explosive growth. However, due to disorder and irregular expression, the potential value of a large amount of information is difficult to be effectively used. This paper proposes a “system code-device code-information code” information coding technology that serves the operation and maintenance of information equipment to make information orderly and standardized. This technology lays the foundation for quickly and accurately finding the required information, fully mining and effectively using the value of information, strengthening information fusion between subsystems, and realizing digital management and control of substation equipment information.
Research on Aging and Burning Performance of AC 380V ZR-YJV Cable Insulation sheat
Authors: Chen Minjiang , Liu Yang , Jiang Lingao , Huang Zhidong , Liu Yang 
Published: April 2021

Abstract
Carrying out research on the aging and burning performance of cable insulation sheath is an important means to prevent cable fires. The thermal aging test box, cone calorimeter and synchronous thermal analyzer were used to study the effect of thermal aging on the combustion performance of AC 380V ZR-YJV cable insulation sheath. The results show that in the early stage of thermal aging of the cable, the ignition time of the YJV cable insulation sheath material gradually increases; compared with unaged cables, the ignition time of cables being aged for 15 days has increased from 8 seconds to 57 seconds while the initial peak value of the heat release rate of the cable decreased from 123 kW/m2 to 22 kW/m2. A large amount of easily decomposable additives in the early stage of thermal volatilized from aging cable sheath may be responsible for the reduction trend of the ignition and fire occurrence of the cable insulation sheath. And for the condition of the aging time increasing, the ignition time decreases from 57s to 32s, and the heat release rate will increase from 22 kW/m2 to 85 kW/m2 in which the ignition and fire trend of the cable insulation sheath increase.
Research of Coal Mining Safety Evaluation on Roughset-Svm
Authors: Zhao Zhen 
Published: April 2021

Abstract
Through the impact of fully mechanized coal mining face security personnel, equipment, operating environment and the analysis of geological environment, the establishment of a fully mechanized coal mining face safety evaluation index system is presented based on rough sets - Support Vector Machine fully mechanized coal mining face Safety assessment model. Model application method of rough set evaluation index system of attributes, eliminate redundant attributes, thus reducing the input of SVM learning sample dimension. On this basis, the use of SVM regression nonlinear characteristics was evaluated, and the final example shows the applicability of this model.