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Neural Regeneration Research 2025年第4期20卷 1164-1177页

作者： Pengfei Wang Yuewei Bi Min Li Jiazhi Chen Zhuyong Wang Huantao Wen Ming Zhou Minjie Luo Wangming Zhang Neurosurgery center Department of Pediatric NeurosurgeryGuangdong Provincial Key Laboratory on Brain Function Repair and RegenerationZhujiang HospitalSouthern Medical UniversityGuangzhouGuangdong ProvinceChina

Long-term levodopa administration can lead to the development of levodopa-induced *** oscillations are a widely recognized hallmark of abnormal neural electrical activity in levodopa-induced ***,studies have reported increased oscillation power in cases of levodopa-induced ***,little is known about how the other electrophysiological parameters of gamma oscillations are altered in levodopa-induced ***,the role of the dopamine D3 receptor,which is implicated in levodopa-induced dyskinesia,in movement disorder-related changes in neural oscillations is *** found that the cortico-striatal functional connectivity of beta oscillations was enhanced in a model of Parkinson’s ***,levodopa application enhanced cortical gamma oscillations in cortico-striatal projections and cortical gamma aperiodic components,as well as bidirectional primary motor cortex(M1)↔dorsolateral striatum gamma *** of PD128907(a selective dopamine D3 receptor agonist)induced dyskinesia and excessive gamma oscillations with a bidirectional M1↔dorsolateral striatum ***,administration of PG01037(a selective dopamine D3 receptor antagonist)attenuated dyskinesia,suppressed gamma oscillations and cortical gamma aperiodic components,and decreased gamma causality in the M1→dorsolateral striatum *** findings suggest that the dopamine D3 receptor plays a role in dyskinesia-related oscillatory activity,and that it has potential as a therapeutic target for levodopa-induced dyskinesia.

关键词： aperiodic components dopamine D3 receptor dorsolateral striatum functional connectivity gamma oscillations levodopa-induced-dyskinesia local field potentials neuromodulation Parkinson’s disease primary motor cortex

Defect band formation in high pressure die casting AE44 magnesium alloy

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China Foundry 2022年第3期19卷 201-210页

作者： Ying-ying Hou Meng-wu Wu Feng Huang Xiao-bo Li Shou-mei Xiong Hubei Key Laboratory of Advanced Technology for automotive components Wuhan University of TechnologyWuhan 430070China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China

The characteristics of defect bands in the microstructure of high pressure die casting(HPDC)AE44 magnesium alloy were *** attention was paid to the effects of process parameters during the HPDC process and casting structure on the distribution of defect *** show that the defect bands are solute segregation bands with the enrichment of Al,Ce and La elements,which are basically in the form of Al_(11)RE_(3) *** is no obvious aggregation of porosities in the defect *** width of the inner defect band is 4-8 times larger than that of the outer *** variation trends of the distribution of the inner and outer defect bands are not consistent under different process parameters and at different locations of *** is due to the discrepancy between the formation mechanisms of double defect *** filling and solidification behavior of the melt near the chilling layer is very complicated,which finally leads to a fluctuation of the width and location of the outer defect *** affecting the content and aggregation degree of externally solidified crystals(ESCs)in the cross section of die castings,the process parameters and casting structure have a great influence on the distribution of the inner defect band.

关键词： high pressure die casting magnesium alloy AE44 defect band microstructure

Analyses of dynamic characteristics of a fluid-filled thin rectangular porous plate with various boundary conditions

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Acta Mechanica Solida Sinica 2017年第1期30卷 87-97页

作者： Yu Xiang automotive and Transportation Engineering Collage Guangxi University of Science and Technology Liuzhou 545006 China Guangxi Key Laboratory of Automobile components and Vehicle Technology Guangxi University of Science and Technology Liuzhou 545006 China

Based on the classical theory of thin plate and Biot theory, a precise model of the transverse vibrations of a thin rectangular porous plate is proposed. The first order differential equations of the porous plate are derived in the frequency domain. By considering the coupling effect between the solid phase and the fluid phase and without any hypothesis for the fluid displacement, the model presented here is rigorous and close to the real materials. Owing to the use of extended homogeneous capacity precision integration method and precise element method, the model can be applied in higher frequency range than pure numerical methods. This model also easily adapts to various boundary conditions. Numerical results are given for two different porous plates under different excitations and boundary conditions.

关键词： Thin rectangular porous plate Blot theory Vibration First order differential equations Extended homogeneous capacity high precision integration method

Effect of Hot Isostatic Pressing on Fatigue Properties of Laser Melting Deposited AerMet100 Steel

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Journal of Iron and Steel Research International 2013年第11期20卷 79-84页

作者： CHENG Hao LIU Dong TANG Hai-bo ZHANG Shu-quan RAN Xian-zhe WANG Hua-ming Engineering Research center of Ministry of Education on Laser Direct Manufacturing for Large Metallic components Beihang University

The ultra-high strength steel AerMetl00 was fabricated .by laser melting deposition （LMD） process. The effect of hot isostatic pressing （HIP） on high-cycle fatigue properties of the LMD AerMet100 steel was investigated, and the influence of defects on fatigue behavior was discussed. Results showed that the LMD AerMetl00 steel had fine directionally solidified cellular dendrite structure and coarse columnar prior austenite grains. Metallurgical de fects such as gas pore and lack-of-fusion porosity were produced during the laser deposition process. After HIP treat- ment, the number and size of metallurgical defects had remarkably decreased. Moreover, high-cycle fatigue proper ties of the alloys after HIP treatment were superior to the as-deposited alloys.

关键词： laser melting deposition hot isostatic pressing AerMetl00 steel high cycle fatigue metallurgical defect

The Controllable Design of Catalyst Inks to Enhance PEMFC Performance:A Review

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Electrochemical Energy Reviews 2021年第1期4卷 67-100页

作者： Yuqing Guo Fengwen Pan Wenmiao Chen Zhiqiang Ding Daijun Yang Bing Li Pingwen Ming Cunman Zhang School of automotive Studies and Clean Energy automotive Engineering center Tongji UniversityShanghai 201804China WeiChai Power Co. Ltd.WeifangShandong 261016China

Typical catalyst inks in proton exchange membrane fuel cells(PEMFCs)are composed of a catalyst,its support,an ionomer and a solvent and are used with solution processing approaches to manufacture conventional catalyst layers(CLs).Because of this,catalyst ink formulation and deposition processes are closely related to CL structure and ***,catalyst inks with ideal rheology and optimized electrochemical performances remain lacking in the large-scale application of *** address this,this review will summarize current progress in the formulation,characterization,modeling and deposition of catalyst *** addition,this review will highlight recent advancements in catalyst ink materials and discuss corresponding complex *** review will also present various catalyst ink dispersion methods with insights into their stability and introduce the application of small-angle scattering and cryogenic transmission electron microscopy(cryo-TEM)technologies in the characterization of catalyst ink ***,recent studies in the kinetic modeling and deposition of catalyst inks will be analyzed.

关键词： Catalyst ink Ink formulation Ink modeling Ink deposition process Proton exchange membrane fuel cell Catalyst layer

Estimation of Vehicle Sideslip Angle with Adaptation to Road Bank Angle and Roll Angle

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Estimation of Vehicle Sideslip Angle with Adaptation to Road...

Effects of annealing temperature and cooling rate on microstructures of a novel titanium alloy Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si manufactured by laser additive manufacturing

2014中国汽车工程学会年会

作者： Ling Jie Chen Hui Xu Fan School of automotive Studies & Clean Energy automotive Engineering center Tongji University

ISBN: (纸本)9783662450420

The road bank angle and roll angle have direct influence on the vehicle’s lateral *** a result,the accuracy of sideslip angle estimation can be improved through estimation of road bank angle and roll *** this paper,estimation of vehicle sideslip angle with adaptation to road bank angle and roll angle is achieved through a proposed Kalman filter at low cost based on the combination of dynamic model and kinematic model,which is developed from a three-freedom model of lateral,yaw and roll *** are the simulation results displayed in this paper.

关键词： sideslip angle road bank angle roll angel Kalman filter low cost sensors

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Journal of Iron and Steel Research International 2018年第4期25卷 442-452页

作者： Guo-chao Li Xu Cheng Xiang-jun Tian National Engineering Laboratory of Additive Manufacturing for Large Metallic components and Engineering Research center of Ministry of Education on Laser Direct Manufacturing for Large Metallic components School of Materials Science and Engineering Beihang University Beijing 100091 China

The microstructure changes of Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si alloy manufactured by laser additive manufacturing （LAM） are systematically investigated with statistical analysis of primary α phase （αp） and secondary α phase （αs） under different annealing conditions. Results indicate that, with the increase in holding temperature, the content of αp lamellas decreases with the increasing αs content, maintaining the total α phases concentration stabilized. The width of αp lamellas and the nominal specific surface area of α phase both exhibit positive correlation with the temperature, while the increment of αp and the widths of αs lamellas show an increase-decrease tendency. Besides, with the decrease in cooling rate, the total content of α and the width of αp lamellas increase, while the nominal specific surface area of α phase shows no significant change. The results indicate that, in the annealing process, the holding temperature determines the surplus and growth interfaces of % lamellas, and the cooling rate influences the nucleation quantity of c^s in unit time. During the cooling stage, the αp lamellas grow initially, and then, the nucleation and crab-like structure growth occur followed by those of the αs lamellas. The time intervals among them are influenced by cooling rate. The mechanism of microstructure formation of the LAMed titanium alloy during annealing stage was discussed, which would guide for the heat treatment method to achieve required microstructure.

关键词： Novel titanium alloy Annealing Microstructure statistics Holding temperature Cooling rate

Microstructure and property of laser additive manufactured alloy Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si after aged at different temperatures

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Rare Metals 2024年第5期43卷 2275-2281页

作者： Guo-Chao Li Xu Cheng Hua-Ming Wang National Engineering Laboratory of Additive Manufacturing for Large Metallic components and Engineering Research center of Ministry of Education on Laser Direct Manufacturing for Large Metallic components School of Materials Science and EngineeringBeihang UniversityBeijing 100191China

The solid solution and aging treatment for conventional manufacturing processes might not be suitable for laser additive manufactured titanium alloys due to the different lamellar *** this study,the influence of aging temperatures(600,700 and 800°C)on microstructure and mechanical properties of titanium alloy Ti-6Al-2V-1.5Mo-0.5Zr-0.3Si was *** results indicate that after solid solution treatment at 970°C followed by water quenching,the alloy mainly consists of coarsening lamellar a phase in martensite α' *** at 600°C will not change the size of primary lamellar α phase but lead to huge amount of secondary a phases(α_(s))generating with very fine *** increasing the aging temperature,the number of α_(s) decreases but with coarsened *** aged at 800°C,the width of the asphase reaches 350 nm,almost 7 times wider than that aged at 600°*** changing size of α_(s) obviously influences the property of the *** fine α_(s) leads to high strength and microhardness but low plasticity,and specimen aged at 700°C with suitable assize has the best comprehensive properties.

关键词： α+βtitanium alloy Laser additive manufacturing Solid solution and aging treatment Microstructure Room temperature tensile property

Investigation of heavy ion irradiation effects on 650-V p-GaN normally-off HEMTs

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Science China(Information Sciences) 2022年第8期65卷 254-260页

作者： Yinhe WU Jincheng ZHANG Shenglei ZHAO Zhaoxi WU Zhongxu WANG Bo MEI Chao DUAN Dujun ZHAO Weihang ZHANG Zhihong LIU Yue HAO Key Laboratory of Wide Band-Gap Semiconductors and Devices School of MicroelectronicsXidian University China Aerospace components Engineering center

In this study, we investigate heavy ion irradiation effects on commercial 650 V p-GaN normallyoff HEMTs. Ge and Cl ions are used to irradiate the GaN devices in the experiments. Ge and Cl ion beam irradiation have little impact on the output characteristics of GaN devices. After heavy ion irradiation, the leakage currents between source and drain electrodes increase significantly under off-state, decreasing the breakdown voltage(BVDS) sharply. Additionally, Ge and Cl ion irradiation have little effect on the trap states under the gate electrode; thus, the gate leakage currents increase slightly. Many line-shaped crystal defects extending from the surface to the GaN buffer layer can be captured using a transmission electron microscope after Ge/Cl ion irradiation. The buffer layers of the irradiated devices were damaged, and the leakage path was generated in the buffer layer. Defect percolation process in buffer layer is the dominant factor of irradiated high-voltage GaN device failure.

关键词： heavy ions irradiation p-GaN normally-off HEMTs line-shaped crystal defects leakage path defect percolation process