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Beyond Performance of Learning Control Subject to Uncertainties and Noise: A Frequency-Domain Approach Applied to Wafer Stages

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IEEE/CAA Journal of Automatica Sinica 2025年第1期 198-214页

作者： Fazhi Song ning Cui Shuaiqi Chen Kai Zhang Yang Liu Xinkai Chen Jiubin Tan IEEE the Center of Ultra-precision Optoelectronic Instrument Engineering Harbin Institute of Technology the Key Laboratory of Ultra-Precision Intelligent Instrumentation Ministry of Industry and Information Technology the State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of Technology the Center of Ultraprecision Optoelectronic Instrument Engineering Harbin Institute of Technology the Key Laboratory of UltraPrecision Intelligent Instrumentation Ministry of Industry and Information Technology the Department of Electronic and Information Systems Shibaura Institute of Technology

The increasingly stringent performance requirement in integrated circuit manufacturing, characterized by smaller feature sizes and higher productivity, necessitates the wafer stage executing a extreme motion with the accuracy in terms of nanometers. This demanding requirement witnesses a widespread application of iterative learning control(ILC), given the repetitive nature of wafer scanning. ILC enables substantial performance improvement by using past measurement data in combination with the system model knowledge. However, challenges arise in cases where the data is contaminated by the stochastic noise, or when the system model exhibits significant uncertainties, constraining the achievable performance. In response to this issue, an extended state observer(ESO) based adaptive ILC approach is proposed in the frequency *** being model-based, it utilizes only a rough system model and then compensates for the resulting model uncertainties using an ESO, thereby achieving high robustness against uncertainties with minimal modeling effort. Additionally, an adaptive learning law is developed to mitigate the limited performance in the presence of stochastic noise, yielding high convergence accuracy yet without compromising convergence speed. Simulation and experimental comparisons with existing model-based and data-driven inversion-based ILC validate the effectiveness as well as the superiority of the proposed method.

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Influence of baffle position on liquid sloshing during braking and turning of a tank truck

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第5期11卷 317-324页

作者： ning KANG Kui LIU School of Transportation Science and Engineering University of A eronautics and Asttvnautics Beijing 100191 China

The influence of baffle position on liquid sloshing during the braking and turning of a tank truck was studied using a volume of fluid (VOF) model. The forces,their positions and weight distribution during braking and the forces and rolling moment during turning were calculated. The reliability of the calculation method was validated by comparisons with experimental results. The results showed that during braking,liquid splashes in the tank and the maximum forces and G (the ratio of weight acting on the front axle to the rear axle) are large when A (the ratio of the arch area above the baffle to the area of cross section)≤0.1. When A≥0.2,as the position of the baffle is lowered,the maximum of Fx (the force in direction x) first decreases then increases,and the maximum of Fy (the force in direction y) and G increase. During turning,liquid splashes in the tank and the maximum forces and M (the rolling moment) are large when D (the ratio of the arch area above the baffle to the area of cross section)≤0.2. When D≥0.3,as the position of the baffle is lowered,the maximums of Fy,Fz (the force in direction z) and M increase.

关键词： Tank truck Volume of fluid (VOF) method Liquid sloshing Two phase flow Baffle

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Equation of Motion of a Spinning Test Particle in Gravitational Field

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Communications in Theoretical Physics 2008年第1期49卷 129-132页

作者： WU ning Institute of High Energy Physics the Chinese Acndemy of Sciences P.O. Box 918-1 Beijing 100049 China

Based on the coupfing between the spin of a particle and gravitoelectromagnetic field, the equation of motion of a spinning test particle in gravitational field is deduced. From this equation of motion, it is found that the motion of a spinning particle deviates from the geodesic trajectory, and this deviation originates from the coupling between the spin of the particle and gravitoelectromagnetic field, which is also the origin of Lense-Thirring effects. In post-Newtonian approximations, this equation gives the same results as those of Mathisson-Papapetrou equation. Effect of the deviation of geodesic trajectory is detectable.

关键词： equation of motion of a spinning particle gauge theory of gravity geodesic trajectory

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Tissue cell differentiation and multicellular evolution via cytoskeletal stiffening in mechanically stressed microenvironments

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Acta Mechanica Sinica 2019年第2期35卷 270-274页

作者： Junwei Chen ning Wang Laboratory for Cellular Biomechanics and Regenerative Medicine Department of Biomedical Engineering College of Life Science and Technology Huazhong University of Science and Technology Wuhan 430074 China Department of Mechanical Science and Engineering University of Illinois at Urbana-Champaign Urbana IL 61801 USA

Evolution of eukaryotes from simple cells to complex multicellular organisms remains a mystery. Our postulate is that cytoskeletal stiffening is a necessary condition for evolution of complex multicellular organisms from early simple eukaryotes. Recent findings show that embryonic stem cells are as soft as primitive eukaryotes-amoebae and that differentiated tissue cells can be two orders of magnitude stiffer than embryonic stem cells. Soft embryonic stem cells become stiff as they differentiate into tissue cells of the complex multicellular organisms to match their microenvironment stiffness. We perhaps see in differentiation of embryonic stem cells (derived from inner cell mass cells) the echo of those early evolutionary events. Early soft unicellular organisms might have evolved to stiffen their cytoskeleton to protect their structural integrity from external mechanical stresses while being able to maintain form, to change shape, and to move.

关键词： Cytoskeleton Force Bacteria Amoebae Eukaryotes

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Learning to memorize: shedding new light on prefrontal functions

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Neuroscience Bulletin 2015年第2期31卷 242-244页

作者： ning-long Xu Institute of Neuroscience State Key Laboratory of Neuroscience CAS Center for Excellence in Brain Science Shanghai Institutes for Biological Sciences Chinese Academy of Sciences

Working memory is one of the essential higher cognitive functions that actively holds behaviorally-relevant information essential for guiding subsequent actions. It includes subsystems that store and manipulate singlemode or multi-modal sensory information, e.g., spatial information, visual images, auditory scenes, olfactory objects, or any combination of these. In addition to merely holding a certain amount of information for a short period of time, as is generally believed, the cognitive processes involved are far more complex, including the executive and attentional control of short-term memory, permitting interim integration, and the processing, disposal, and retrieval of information. Evolution-wise, working memory is essential for the behavioral flexibility that allows humans and animals to quickly adapt to rapidly changing environments.

关键词： PFC Learning to memorize shedding new light on prefrontal functions

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Age Hardening of Rapidly-Solidified Mo-Th-B Alloys

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Rare Metals 1989年第1期9卷 19-22页

作者： ning, Yuantao Inst of Precious Metals China

Splat foils with 30-35 μm thickness and spum ribbon with 50-55 μm thickness of Mo-4Th-0.4B and Mo-8Th-0.8B were made by arc melt hammer-anvil and melt spinning techniques. Both alloys have high hardness and a strong age hardening response, especially Mo-8Th-0.8B. The precipitates associated with age hardening were ThB4(tetragon) and Mo2B (C16, BTC). The times for reaching a age hardening peak for both alloys are not the same and depended on the precipitation extent of Th and B solutes from the metastable solid solution. Grain refinement was observed. The work indicates that new high strength Mo alloys can be developed by rapid solidification.

关键词： Molybdenum Metallography Microstructures X ray Analysis

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Aircraft air conditioning system health state estimation and prediction for predictive maintenance

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Chinese Journal of Aeronautics 2020年第3期33卷 947-955页

作者： Jianzhong SUN Fangyuan WANG Shungang ning Department of Civil Aviation Nanjing University of Aeronautics and AstronauticsNanjing 210016China

The vast potential of system health monitoring and condition based maintenance on modern commercial aircraft is being realized through the innovative use of Airplane Condition Monitoring System(ACMS) *** there are few methods addressing the issues of failure prognostics and predictive maintenance for commercial aircraft Air Conditioning System(ACS).This study developed a Bayesian failure prognostics approach using ACMS data for predictive maintenance of ***, a health index characterizing the ACS health state is inferred from a multiple sensor signals using a data driven *** a dynamic linear model is proposed to describe the degradation process for failure *** inference formulas are carried out for degradation estimation and *** developed approach is applied on a passenger aircraft fleet with ACMS data recorded for one *** analysis of the case study shows that the developed method can produce satisfactory prognostics results, where all the ACS failure precursors are identified in advance, and the relative errors for the failure time prediction made when just entering the degradation warning stage are less than 8%.This would allow operators to proactively plan future maintenance.

关键词： Aircraft air conditioning system Bayesian method Failure prognostics Health index Predictive maintenance

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Defect engineering: A versatile tool for tuning the activation of key molecules in photocatalytic reactions

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Journal of Energy Chemistry 2019年第10期28卷 43-57页

作者： ning Zhang Chao Gao Yujie Xiong Hefei National Laboratory for Physical Sciences at the Microscale iChEM (Collaborative Innovation Center of Chemistry for Energy Materials) and School of Chemistry and Materials Science University of Science and Technology of China

Many photocatalytic reactions such as CO2 reduction and N2 fixation are often limited by the activation of some key molecules. Defects in solid materials can robustly introduce coordinately unsaturated sites to serve as highly active sites for molecular chemisorption and activation. As a result, rational defect engineering has endowed a versatile approach to further develop photocatalytic applications beyond water splitting. The subtly designed defects in photocatalysts can play critical and decisive roles in molecular activation as proven in recent years. The defects cannot only serve as active sites for molecular chemisorption, but also spatially supply channels for energy and electron transfer. In this review, we aim to summarize the diversiform photocatalytic applications using defects as active sites, including but not limited to CO2 reduction, O2 activation,H2O dissociation, N2 fixation as well as activation of other molecules. In particular, we emphatically outline how the parameters of defects (e.g.,concentration,location,geometric and electronic structures) can serve as the knobs for maneuvering molecular adsorption and activation as well as altering subsequent reaction pathway. Moreover, we underline the remaining challenges at the current stage and the potential development in the *** is anticipated that this review consolidates the in-depth understanding towards the structure-activity relationship between defects and related reactions.

关键词： Defect engineering Photocatalysis Molecular adsorption Molecular activation Electron transfer

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Size analysis of slag eye formed by gas blowing in ladle refining

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Journal of Iron and Steel Research International 2017年第3期24卷 243-250页

作者： ning-ning Lv Liu-shun Wu Hai-chuan Wang Yuan-chi Dong Chang Su School of Metallurgical Engineering Anhui University of Technology Ma'anshan 243032 Anhui China Key Laboratory of Metallurgical Emission Reduction & Resources Recycling Ministry of Education Ma' anshan 243002 AnhuiChina

The formation of slag eye in a gas stirred ladle was studied through cold models and industrial trials. In the cold model,water and sodium tungstate solution were employed to simulate liquid steel,and silicon oil was employed to simulate slag. The simulation results revealed that the gas flow rate and bath height had strong effects on the slag eye size. In particular,the thickness of slag layer played a strong role in the slag eye size. In addition,the slag eye could not be formed when the thickness of the top layer was more than 4 cm in water-silicone oil ***,the section area of vessel had a great impact on the slag eye size. Industrial trials results showed a similar trend that the gas flow rate was very significant on the slag eye size. The predictions of the existing models showed larger predictions deviations compared with the experimental data. Moreover,a new model without fitting parameters was developed based on force balance and mathematical derivation,and verified by the experimental data. The new model provides the prediction with small deviations by comparing with the data acquired from cold models and industrial trials.

关键词： Slag eye Cold model Industrial trial Gas blowing Ladle refining

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Relationship between dealloying conditions and coarsening behaviors of nanoporous copper fabricated by dealloying Cu-Ce metallic glasses

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Journal of Materials Science & Technology 2018年第7期34卷 1162-1171页

作者： ning Wang Ye Pan Shikai Wu School of Materials Science and Engineering Southeast University Jiangsu Key Laboratory for Advanced Metallic Materials

Monolithic nanoporous copper （NPC） with tunable ligament size （107-438 nm） was synthesized by dealloying a new Cu-Ce binary glassy precursor in dilute H2 SO4 aqueous solution. The effects of the dealloying conditions on the morphologies of NPC were evaluated comprehensively. The results show that the ligaments of NPC can significantly coarsen with the increase of acid concentration, elevation of reaction temperature or prolongation of immersion time. These coarsening behaviors can be well described by a diffusion based growth kinetic model. Moreover, the surface diffusivity and activation energy for diffu- sion of Cu atoms were also estimated to investigate the formation mechanism of NPC, which is mainly governed by dissolution of Ce element in the glassy precursor coupled with nucleation and growth of Cu clusters via the precursor/solution interface. In the experiment of the degradation of methyl orange （MO） dye, the NPC fabricated by Cu-Ce metallic glasses exhibits superior sono-catalytic activity.2018 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology.

关键词： Cu-Ce metallic glasses Nanoporous copper Dealloying Diffusion Sono-Fenton-like

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