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Feedback linearization and equivalent-disturbance compensation control strategy for piezoelectric stage

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Nanotechnology and Precision Engineering 2024年第2期7卷 49-59页

作者： Tao Huang Yingbin Wang Zhihong Luo huajun Cao Guibao Tao Mingxiang Ling State Key Laboratory of Mechanical Transmissions for Advanced Equipment Chongqing UniversityChongqing 400044China College of Mechanical and Vehicle Engineering Chongqing UniversityChongqing 400044China Hongdu Aviation Industry Group NanchangJiangxi 330000China Robotics and Microsystems Center Soochow UniversitySuzhou 215123China

Piezoelectric stages use piezoelectric actuators and flexure hinges as driving and amplifying mechanisms,*** systems have high positioning accuracy and high-frequency responses,and they are widely used in various precision/ultra-precision positioning ***,the main challenge with these devices is the inherent hysteresis nonlinearity of piezoelectric actuators,which seriously affects the tracking accuracy of a piezoelectric *** by this challenge,in this work,we developed a Hammerstein model to describe the hysteresis nonlinearity of a piezoelectric *** particular,in our proposed scheme,a feedback-linearization algorithm is used to eliminate the static hysteresis *** addition,a composite controller based on equivalent-disturbance compensation was designed to counteract model uncertainties and external *** analysis of the stability of a closed-loop system based on this feedback-linearization algorithm and composite controller was performed,and this was followed by extensive comparative experiments using a piezoelectric stage developed in the *** experimental results confirmed that the feedback-linearization algorithm and the composite controller offer improved linearization and trajectory-tracking performance.

关键词： Piezoelectric stage Hysteresis nonlinearity Feedback linearization Equivalent-disturbance compensation

A VGGNet-based correction for satellite altimetry-derived gravity anomalies to improve the accuracy of bathymetry to depths of 6500 m

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Acta Oceanologica Sinica 2024年第1期43卷 112-122页

作者： Xiaolun Chen Xiaowen Luo Ziyin Wu Xiaoming Qin Jihong Shang huajun Xu Bin Li Mingwei Wang Hongyang Wan Key Laboratory of Submarine Geosciences Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Ocean College Zhejiang UniversityZhoushan 316021China Key Laboratory of Ocean Space Resources Management Technology Marine Academy of ZhejiangHangzhou 310012China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200240China School of Civil Engineering and Architectures Zhejiang University of Science and TechnologyHangzhou 310023China National Center for Archaeology Beijing 100013China

Understanding the topographic patterns of the seafloor is a very important part of understanding our *** the science involved in bathymetric surveying has advanced much over the decades,less than 20%of the seafloor has been precisely modeled to date,and there is an urgent need to improve the accuracy and reduce the uncertainty of underwater survey *** this study,we introduce a pretrained visual geometry group network(VGGNet)method based on deep *** apply this method,we input gravity anomaly data derived from ship measurements and satellite altimetry into the model and correct the latter,which has a larger spatial coverage,based on the former,which is considered the true value and is more *** obtaining the corrected high-precision gravity model,it is inverted to the corresponding bathymetric model by applying the gravity-depth *** choose four data pairs collected from different environments,i.e.,the Southern Ocean,Pacific Ocean,Atlantic Ocean and Caribbean Sea,to evaluate the topographic correction results of the *** experiments show that the coefficient of determination(R~2)reaches 0.834 among the results of the four experimental groups,signifying a high *** standard deviation and normalized root mean square error are also evaluated,and the accuracy of their performance improved by up to 24.2%compared with similar research done in recent *** evaluation of the R^(2) values at different water depths shows that our model can achieve performance results above 0.90 at certain water depths and can also significantly improve results from mid-water depths when compared to previous ***,the bathymetry corrected by our model is able to show an accuracy improvement level of more than 21%within 1%of the total water depths,which is sufficient to prove that the VGGNet-based method has the ability to perform a gravity-bathymetry correction and achieve outstanding results.

关键词： gravity anomaly bathymetry inversion VGGNet multibeam sonar satellite altimetry

Regulation of"P35/P25-CDK5-Tau"signaling pathway in hippocampi and prefrontal cortex of AD rats by electroacupuncture

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解剖学杂志 2021年第S1期44卷 127-128页

作者： Zhu Shujuan sheng huajun Xu Jin Department of Human Anatomy Chongqing Medical UniversityChongqing 400016China

Fifty SD rats were randomly divided into control,sham,model and electroacupuncture treatment group in this *** model rats were established by injecting *** into the hippocampi,while the same amount of saline was injected into the sham *** model rats were treated by electroacupuncture stimulation at"Baihui"and"Shenshu"acupoints once a day for 10 *** behavioral experiments results showed that the learning and memory ability of the AD rats were significantly decreased compared with the controls and shams,while depression-related behaviors were significantly increased.

关键词： electroacupuncture rats stimulation

Boosting the performance of LiNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) electrode by uniform Li_(3)PO_(4) coating via atomic layer deposition

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Chinese Chemical Letters 2024年第5期35卷 499-503页

作者： Mingjiao Lu Zhixing Wang Gui Luo huajun Guo Xinhai Li Guochun Yan Qihou Li Xianglin Li Ding Wang Jiexi Wang School of Metallurgy and Environment Central South UniversityChangsha 410083China BASF ShanShan Battery Materials Co. Ltd.Changsha 410006China Engineering Research Center of the Ministry of Education for Advanced Battery Materials Central South UniversityChangsha 410083China Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy Central South UniversityChangsha 410083China School of Physics and Chemistry Hunan First Normal UniversityChangsha 410205China National and Local Joint Engineering Laboratory for Lithium-ion Batteries and Materials Preparation Technology Key Laboratory of Advanced Battery Materials of Yunnan ProvinceFaculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China

Ultra-high nickel material is considered to be a promising cathode ***,with the increase of nickel content,the interfacial side reactions between the cathode and electrolyte become increasingly ***,an atomically controllable ionic conductor Li_(3)PO_(4)(LPO)coating is deposited on the LiNi_(0.90)Co_(0.06)Mn_(0.04)O_(2)(NCM9064)based electrode by the atomic layer deposition *** results shows that the LPO coating is uniformly and densely covered on the surface of secondary particles of NCM9064,helping to prevent the direct contact between the electrolyte and cathode during the chargingdischarging *** addition,the coating layer is electrochemically *** a result,the interfacial side reactions during the long cycle are effectively suppressed,and the solid electrolyte interphase layer at the interface is *** electrode with 20 layers of LPO deposition(ALD-LPO-20)exhibits an excellent capacity retention of 81%after 200 cycles in 2.8-4.3 V at 25℃,which is 18%higher than the unmodified material(ALD-LPO-0).Besides,the moderate LPO coating improves the rate capability and high temperature cycling performance of *** study provides a method for the modification of ultra-high nickel cathode materials and corresponding electrodes.

关键词： Ultra-high nickel material LiNi_(0.90)Co_(0.06)Mn_(0.04)O_(2) Atomic layer deposition Li_(3)PO_(4) Ionic conductor

Regulation of "P35/P25-CDK5-Tau" signaling pathway in hippocampi and prefrontal cortex of AD rats by electroacupuncture

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Regulation of "P35/P25-CDK5-Tau" signaling pathway in hippoc...

Reconfigurable and polarization-dependent optical filtering for transflective full-color generation utilizing low-loss phase-change materials

中国解剖学会2021年年会

作者： Zhu Shujuan sheng huajun Xu Jin Department of Human Anatomy Chongqing Medical University

Fifty SD rats were randomly divided into control,sham,model and electroacupuncture treatment group in this *** model rats were established by injecting Aβ into the hippocampi,while the same amount of saline was injected into the sham *** model rats were treated by electroacupuncture stimulation at "Baihui" and "Shenshu" acupoints once a day for 10 days.

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Journal of Semiconductors 2024年第7期45卷 46-53页

作者： Shuo Deng Mengxi Cui Jingru Jiang Chuang Wang Zengguang Cheng huajun Sun Ming Xu Hao Tong Qiang He Xiangshui Miao School of Integrated Circuits Huazhong University of Science and TechnologyWuhan 430074China Hubei Yangtze Memory Laboratories Wuhan 430205China School of Microelectronics Fudan UniversityShanghai 200433China

All-dielectric metasurface, which features low optical absorptance and high resolution, is becoming a promising candidate for full-color generation. However, the optical response of current metamaterials is fixed and lacks active tuning. In this work, we demonstrate a reconfigurable and polarization-dependent active color generation technique by incorporating low-loss phase change materials(PCMs) and CaF_2 all-dielectric substrate. Based on the strong Mie resonance effect and low optical absorption structure, a transflective, full-color with high color purity and gamut value is achieved. The spectrum can be dynamically manipulated by changing either the polarization of incident light or the PCM state. High transmittance and reflectance can be simultaneously achieved by using low-loss PCMs and substrate. The novel active metasurfaces can bring new inspiration in the areas of optical encryption, anti-counterfeiting, and display technologies.

关键词： structural color reconfigurable all-dielectric metasurfaces phase change material

一种基于区块链和动态代理模型的舰船数据应用方法

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中国造船 2024年第2期65卷 256-264页

作者：刘子祥程成洪华军赵峰中国船舶科学研究中心无锡214082

引入区块链技术以满足舰船设计研发工作对多方数据受控安全共享和应用的需求。根据数据管理和应用服务功能建立一套区块链底座,基于随机森林算法和动态样本法开发舰船阻力动态代理模型预报程序,实现程序与区块链底座的功能集成。以水面... 详细信息

引入区块链技术以满足舰船设计研发工作对多方数据受控安全共享和应用的需求。根据数据管理和应用服务功能建立一套区块链底座,基于随机森林算法和动态样本法开发舰船阻力动态代理模型预报程序,实现程序与区块链底座的功能集成。以水面舰船阻力数据为应用实例,模拟多方数据共享与应用场景。结果表明,论文方法能够实现设计功能,具备工程实用性。

关键词：区块链数据应用舰船阻力代理模型

指向初中科学“理解”学习的表现性评价实践研究

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物理教学 2024年第6期46卷 34-38页

作者：孙华君绍兴市柯桥区鲁迅外国语学校浙江312030

“理解”是学习的过程和方式。在初中科学学习中,对学生开展指向“理解”学习的评价,可以帮助学生掌握理解学习的操作要点,开展有效的理解学习活动,提升学生科学学习的效度。文章以华东师大版《科学(七年级下册)》“透镜和视觉”一课为... 详细信息

“理解”是学习的过程和方式。在初中科学学习中,对学生开展指向“理解”学习的评价,可以帮助学生掌握理解学习的操作要点,开展有效的理解学习活动,提升学生科学学习的效度。文章以华东师大版《科学(七年级下册)》“透镜和视觉”一课为例,通过指向理解学习的表现性任务设计和表现性评价量表制作,阐述指向初中科学“理解”学习的表现性评价实施策略。

关键词：初中科学理解学习表现性评价实施研究

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新时代十年中国绿色发展之路

中国人口·资源与环境 2024年第3期34卷 102-111页

作者：刘华军吴倩敏山东财经大学经济学院山东济南250014 山东财经大学高质量发展研究中心山东济南250014

新时代生态文明建设的成就举世瞩目,成为新时代党和国家事业取得历史性成就、发生历史性变革的显著标志。该研究基于生态环境治理现代化的视角,总结回顾了新时代十年中国的绿色发展历程;从绿色发展体制机制、生态环境质量、经济绿色转... 详细信息

新时代生态文明建设的成就举世瞩目,成为新时代党和国家事业取得历史性成就、发生历史性变革的显著标志。该研究基于生态环境治理现代化的视角,总结回顾了新时代十年中国的绿色发展历程;从绿色发展体制机制、生态环境质量、经济绿色转型、绿色低碳生活、全球可持续发展等方面出发,直观展示了新时代十年中国的绿色发展成效;以协同推进降碳、减污、扩绿、增长和正确处理五个重大关系为导向,提出新征程上深入推动绿色发展的优化路径。绿色发展是中国共产党人在不懈探索下形成的全新发展模式,是发展观的一场深刻革命,其内涵包括经济“绿色化”和绿色“经济化”两个方面,具有深刻的理论逻辑、历史逻辑和现实逻辑。从党的十八大到党的二十大的十年间,中国多措并举完善治理制度、多维联动推动环境共治、科学有力实施治理手段、多管齐下提高治理效能,成功探索出了一条顺应自然、促进人与自然和谐共生的绿色发展之路。新时代十年来,中国绿色发展的体制机制不断健全,生态环境质量实现全局性改善,经济绿色转型取得重要进展,绿色低碳生活成为新风尚,为全球可持续发展贡献中国力量,创造了举世瞩目的生态奇迹和绿色发展奇迹,绿色成为中国式现代化的显著特征。把握党的二十大提出的新任务新要求,分析当前面临的新情况新问题,新征程上继续推动绿色发展,必须切实增强系统观念,协同推进降碳、减污、扩绿、增长,加快形成降碳、减污、扩绿、增长的协同机制,正确处理5个重大关系,加快推进人与自然和谐共生的现代化,厚植高质量发展的绿色底色,推动中国绿色发展之路行稳致远。

关键词：新时代绿色发展人与自然和谐共生中国式现代化