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中国神经科学学会第四次会员代表大会暨第八届全国学术会议

作者： Kai YU~1,Ning-Qian WANG~1,Zhuo ZHANG~1,Ying-Shing CHAN~2,Ju-Fang HE~(1,*) 1 Department of Rehabilitation Sciences,The Hong Kong Polytechnic University,Hong Kong,China 2 Department of Physiology and Research Centre of Heart,Brain,Hormone,and Healthy Aging,LKS Faculty of Medicine, University of Hong Kong,Hong Kong,China

＜正＞Pyramidal neurons in different layers of the cerebral cortex send abundant dendrites into the superficial *** the present study,we investigated the functional implication of superficial layer neurons in the auditory cortex in terms of its influence on other cortical *** responses and spontaneous activities in the primary auditory cortex were recorded through in vivo intracellular recordings and multiple extracellular recordings in anesthetized guinea pigs,while electrical stimuli were applied to active neurons in different *** some cases,the firings of single neuron were manipulated by electrical pulses delivered by intracellular *** results showed that electrical stimuli changed the firing pattern of neurons that located in deep and superficial *** long lasting firing of single superficial layer neuron changed the global state of the auditory *** results indicate that the superficial layer plays a modulatory role in the cortex.

关键词： auditory cortex superficial layer brain state modulation

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Improving superficial microstructure and properties of the laser-processed ultrathin kerf in Ti-6Al-4V alloy by water-jet guiding

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Journal of Materials Science & Technology 2023年第25期156卷 32-53页

作者： Yang Chao Yuezhuan Liu Zifa Xu Weixin Xie Li Zhang Wentai Ouyang Haichen Wu Zebin Pan Junke Jiao Shujun Li Guangyi Zhang Wenwu Zhang Liyuan Sheng Ningbo Institute of Materials Technology and Engineering Key Laboratory of Aero Engine Extreme Manufacturing Technology of Zhejiang ProvinceCASNingbo 315201China School of Mechanical Engineering Ningbo University of TechnologyNingbo 315336China Huizhou Port Customs Huizhou 516084China School of Mechanical Engineering Yangzhou UniversityYangzhouJiangsu 225127China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China Shenzhen Institute Peking UniversityShenzhen 518057China PKU-HKUST ShenZhen-HongKong Institution Shenzhen 518057China

In the present research,the gas-assisted laser(GAL)and water-jet guided laser(WGL)processing technologies were applied to machine the ultrathin kerf in the wrought Ti-6Al-4V *** microstructure,microhardness,and wear properties of the superficial layer were *** results reveal that the GAL processing could machine the kerf with a high depth-to-width ratio of 12–15,but the increased processing times enhance the depth *** to the oxygen entrainment and relatively low heat and mass transferring efficiency,the assisted gas promotes the formation of a scaled recast layer containingβ-Ti phase and oxides,which increases the roughness to 20μ*** WGL processed kerf has a low depth-to-width ratio with a value of 1.9–2.5 and the depth could be increased by increasing the WGL processing *** the assistance of the water jet,the remelted debris and heat could be eliminated immediately,which restrains the formation of the recast layer and heat-affected *** ultrathin oxide outer layer with hundreds of nanometers and ultrafineα-Ti grain inner layer are formed on the surface,which decreases the roughness to 12μ*** with the as-received Ti-6Al-4V alloy,the microhardness of GAL processed kerf surface is increased to 382.8 HV accompanied by residual tensile stress,while the microhardness of WGL processed kerf surface is increased to 481.6 HV accompanying with residual compressive *** addition,the GAL processing increases the wear rate at room temperature but decreases the wear rate at high ***,the WGL processing decreases the wear rate at room and high temperatures,*** wear behaviors could be ascribed to their different superficial microstructures and phase constituents.

关键词： Ti-6Al-4V alloy Water-jet guided laser processing superficial layer Microstructure Wear properties

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