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1,386 results on '"Lu, Haifeng"'

267. Classification of Cognitive Impairment and Healthy Controls Based on Transcranial Magnetic Stimulation Evoked Potentials

Author

Zhang, Jiahao, primary, Lu, Haifeng, additional, Zhu, Lin, additional, Ren, Huixia, additional, Dang, Ge, additional, Su, Xiaolin, additional, Lan, Xiaoyong, additional, Jiang, Xin, additional, Zhang, Xu, additional, Feng, Jiansong, additional, Shi, Xue, additional, Wang, Taihong, additional, Hu, Xiping, additional, and Guo, Yi, additional

Published
2021
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271. Current Control Method of Vehicle Permanent Magnet Synchronous Motor Based on Active Disturbance Rejection Control.

Author

Wang, Jinyu, Miao, Qiang, Zhou, Xiaomin, Sun, Lipeng, Gao, Dawei, and Lu, Haifeng

Subjects
PERMANENT magnet motors, FREQUENCY-domain analysis, DYNAMIC testing, ELECTRIC vehicles
Abstract

Due to the frequently changing working conditions and complex operating environment of electric vehicle permanent magnet synchronous motor(PMSM), the motor parameters change dramatically. However, the performance of the PI current regulator, which is the most widely used, is sensitive to motor parameters and has weak robustness, which will lead to the deterioration of motor control system performance. To address this problem, active disturbance rejection control (ADRC) technology is applied to the PMSM current loop control. Firstly, the traditional ADRC current regulator is designed, and the performance and parameter tuning laws of the extended state observer are analyzed by the method of frequency domain analysis. Then, the traditional ADRC algorithm is improved in three aspects: observation error compensation, utilization of model information and anti-windup. After that, simulations and bench test validation are performed. The simulation results show that the improved ADRC current regulator is more robust in the face of parameter changes. The torque step test results show that the improved ADRC current regulator has fast dynamic response without overshoot and has high robustness when the motor parameters change. The dynamic test results show that the improved ADRC current regulator has high robustness when the load, speed and motor parameters change, and the anti-windup measures designed can effectively overcome the integral saturation phenomenon. [ABSTRACT FROM AUTHOR]

Published
2023
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278. A Thermal Effect Model for the Impact of Vertical Groundwater Migration on Temperature Distribution of Layered Rock Mass and Its Application

Author

Lu Haifeng, Zhang Guifang, Yuan Zhang, and Zhang Manman

Subjects
Convective heat transfer, 020209 energy, Geography, Planning and Development, Borehole, Mineralogy, 02 engineering and technology, Aquatic Science, 010502 geochemistry & geophysics, Curvature, 01 natural sciences, Biochemistry, layered rock mass, Physics::Geophysics, Thermal conductivity, 0202 electrical engineering, electronic engineering, information engineering, Rock mass classification, vertical migration, Geothermal gradient, TD201-500, 0105 earth and related environmental sciences, Water Science and Technology, Water supply for domestic and industrial purposes, geothermal gradient, geothermal resources, Hydraulic engineering, Thermal conduction, TC1-978, Groundwater, Geology
Abstract

On the basis of the one-dimensional heat conduction–convection equation, a thermal effect model for vertical groundwater migration in the stratified rock mass was established, the equations for temperature distribution in layered strata were deduced, and the impacts of the vertical seepage velocity of groundwater and the thermal conductivity of surrounding rocks on the temperature field distribution in layered strata were analyzed. The proposed model was employed to identify the thermal convection and conduction regions at two temperature-measuring boreholes in coal mines, and the vertical migration velocity of groundwater was obtained through reverse calculation. The results show that the vertical temperature distribution of the layered rock mass is subject to the migration of the geothermal water, the temperature curve of the layered formation is convex when the geothermal water travels upward, but concave when the water moves downward. The temperature distribution in the stratified rock mass is also subject to the thermal conductivity of the rock mass, greater thermal conductivity of the rock mass leads to a larger temperature difference among regions of the rock mass, while weaker thermal conductivity results in a smaller temperature difference. A greater velocity of the vertical migration of geothermal water within the surrounding rock leads to a larger curvature of the temperature curve. The model was applied to a study case, which showed that the model could appropriately describe the variation pattern of the ground temperature in the stratified rock mass, and a comparison between the modeling result and the measured ground temperature distribution revealed a high goodness of fit of the model with the actual situation.

Published
2021

279. Stargazin Interaction With Serine Racemase Mediates Cerebral Ischemia/Reperfusion Injury in Rats

Author

Yuan, Xiaqing, primary, Diao, Shanshan, additional, Chen, Shujun, additional, Lu, Jiajie, additional, Shen, Haitao, additional, Li, Haiying, additional, Li, Xiang, additional, Wu, Jiang, additional, Liu, Chao, additional, Yang, Ya, additional, Xue, Qun, additional, Fang, Qi, additional, Zhao, Hongru, additional, Gan, Lei, additional, Ni, Jianqiang, additional, Lu, Haifeng, additional, Zhu, Juehua, additional, and Chen, Gang, additional

Published
2021
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283. Corrigendum to “Down-regulation of UBA6 exacerbates brain injury by inhibiting the activation of Notch signaling pathway to promote cerebral cell apoptosis in rat acute cerebral infarction model” [Mol. Cell. Probes 53 (2020) 101612]

Author

Chen, Zhiguo, primary, Liu, Jiangang, additional, Chen, Qingmei, additional, Su, Min, additional, Lu, Haifeng, additional, Yang, Yi, additional, Zhou, Guoqing, additional, Zhang, Xianxian, additional, Liu, Yuan, additional, Dong, Wanli, additional, and Fang, Qi, additional

Published
2021
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291. Geochronology, geochemistry, and Hf isotopic compositions of the Early Devonian Heihaibei granite in the East Kunlun Orogen, Northwest China.

Author

Lu, Haifeng, Pan, Tong, Jiao, He, Ding, Qing-feng, Zheng, Tao, Zhou, Xuan, and Wu, Ruizhe

Abstract

The East Kunlun Orogen (EKO) is located in the western part of the Central Asian Orogenic Belt, and it records the Neoproterozoic–Early Devonian tectonic evolution involving the subduction and extinction of the Proto-Tethys Ocean. The Heihaibei granite is located in the South Kunlun belt within EKO. In this study, geochronology, geochemistry, and Hf isotope analysis of Heihaibei monzogranite and granodiorite were carried out. Their LA-ICP-MS zircon U-Pb results yielded ages of 414.1 ± 2.0 and 417.8 ± 2.0 Ma. The Heihaibei granite is peraluminous (A/CNK = 0.99–1.30), with high alkali contents (7.76–9.14 wt.%) and 10 000 Ga/Al (2.60–3.38), FeOT/MgO (27.6–49.5), and Y/Nb ratios (1.93–2.93), suggesting that the Heihaibei granite is an A2-type granite. The Heihaibei granite samples have zircon εHf(t) values ranging from −6.3 to −0.3, which suggests that the Early Devonian granite was derived from partial melting of Mesoproterozoic (TDM2 = 1797–1415 Ma) crust. When considering data on contemporaneous granites, geochronological and geochemical data for the Heihaibei granite indicate that it was emplaced in a post-collisional extension environment following the closure of the Proto-Tethys Ocean. The Heihaibei granite was formed by extension of the southern subduction accretionary complex as part of the post-collisional setting during the closure of the Proto-Tethys Ocean. [ABSTRACT FROM AUTHOR]

Published
2022
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300. Oral Microbiome Characteristics in Patients With Autoimmune Hepatitis

Author

Rao, Benchen, primary, Lou, Jiamin, additional, Lu, Haifeng, additional, Liang, Hongxia, additional, Li, Juan, additional, Zhou, Heqi, additional, Fan, Yajuan, additional, Zhang, Hua, additional, Sun, Ying, additional, Zou, Yawen, additional, Wu, Zhongwen, additional, Jiang, Yan, additional, Ren, Zhigang, additional, and Yu, Zujiang, additional

Published
2021
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