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Recent advances in ocular lubrication

Friction 2024年第9期12卷 1929-1954页

作者： Jianhua ZHANG Yunjuan SU Jian WU Hongdong WANG School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China

The ocular lubrication,where the eyelid constantly slides on the curved corneal surface,is considered as one of primary lubrication systems in *** reliable lubrication conditions,sensitive ocular tissues remain intact from fatigue damage during spontaneous blink *** tear film,evenly filled between cornea and conjunctiva,is a biological fluid with dynamic adjustment ability,which provides superior lubrication with the friction coefficient of below ***,the lubrication failure may result in a variety of uncomfortable symptoms such as inflammatory reactions,tissue damage and neurological ***,it is essential to clarify the fundamental mechanism of ocular lubrication,which helps to alleviate and even recover from various ocular *** review firstly demonstrates that the ocular components,containing lipids and mucins,contribute to maintaining the lubrication stability of tear ***,the ocular lubrication state in various physiological environments and the physical effect on tear film dynamics are further *** typical applications,the therapeutic agents of dry eye syndrome and contact lens with superior lubrication effects are introduced and their lubrication mechanisms are ***,this review summarizes a series of the latest research inspired by ocular ***,this work will provide a valuable guidance on the theoretical research and extensive applications in the field of biological lubrication.

关键词： bio-tribology ocular lubrication tear film dry eye syndrome tear film dynamics

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Adjustable superlubricity system using polyalkylene glycol with various acid aqueous solutions

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Friction 2023年第7期11卷 1138-1149页

作者： Wenrui LIU Hongdong WANG Yuhong LIU State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China School of Mechatronic Engineering and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China

Polyalkylene glycol(PAG)aqueous solutions have recently been demonstrated to exhibit an ultralow friction coefficient(COF,μ<0.01).However,the prolonged running-in period and low bearing capacity have limited its widespread *** this study,we determined that the running-in period can be decreased by more than 75%when the pH value of the lubricant is controlled at 3 by introducing various acid ***,less time was required to realize stable superlubricity with inorganic acid at lower pH *** was mainly attributed to the acceleration effect of hydrogen ions around the contact *** case of PAG aqueous solution with organic acid,the wear loss between sliding solid surfaces was reduced,and thus the bearing pressure during the superlubricity period was significantly improved from approximately 30 to 160 ***,the organic acid molecules were considered to form strong hydrogen bonds with PAG macromolecules and solid *** in turn strengthened the structure of the adsorption *** unique effect of different acids in aqueous polymer lubrication can potentially significantly aid in advancing the study of polymer tribology and broadening industrial applications.

关键词： superlubricity running-in time bearing pressure organic acid hydrogen bond

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Optimizing Photonic Annealing Technique for Full-Solution-Processed Oxide Thin Film Transistor

Optimizing Photonic Annealing Technique for Full-Solution-Pr...

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International Conference on display Technology, 2024

作者： Xu, Meng Li, Xifeng Key Laboratory of Advanced Display and System Application Ministry of Education Shanghai University Shanghai200072 China

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Simple and effective:Superlubricity behaviour of the G-quadruplex hydrogel with high selectivity for K^(+) ions based on the ocular environment

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Friction 2024年第11期12卷 2548-2562页

作者： Hongdong WANG Jian WU Kunpeng WANG Yunjuan SU Xiacong ZHANG Yuhong LIU Jianhua ZHANG School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China Department of Polymer Materials School of Materials Science and EngineeringShanghai UniversityShanghai 200444China

Hydrogels have been the subject of significant research in the field of friction due to their exceptional lubricating *** this study,the G-quadruplex hydrogel with high selectivity for K^(+) ions was formed by introducing a mixture of G,2-formylphenylboronic acid,and polyethylene glycol diamine into simulated artificial tears solution with high transparency,and an ultra-low coefficient of friction(COF)of about 0.004 was obtained based on the simulated ocular environment,thus achieving macroscopic *** friction pairs simulating the ocular environment,to assess the frictional performance of the G-quadruplex hydrogel as both a lubricant and a friction pair based on the simulated ocular environment,we conducted experiments considering various factors such as concentration,sliding speed,and *** these experiments,it was found that superlubricity was achieved when the G-quadruplex hydrogel was applied as lubricant or friction *** effect was attributed to the three-dimensional network structure and hydrophilicity of the hydrogel,which facilitated the formation of a highly bearing and flowing hydration layer,promoting macroscopic *** to the G-quadruplex hydrogel with low concentration,the high concentration hydrogel(75 mM)exhibited increased mechanical strength and robustness in *** with biocompatibility experiments,our synthesized G-quadruplex hydrogel has excellent biocompatibility and offers a novel approach to achieve superlubricity in ocular drug delivery.

关键词： superlubricity ocular environment G-quadruplex hydrogel bio-compatibility

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Artificial synapses based on organic electrochemical transistors with self-healing dielectric layers

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Chinese Chemical Letters 2024年第3期35卷 423-427页

作者： Yushan Gao Junyao Zhang Dapeng Liu Tongrui Sun Jun Wang Li Li Shilei Dai Jianhua Zhang Zhenglong Yang Jia Huang School of Materials Science and Engineering Tongji UniversityShanghai 201804China Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200072China National Key Laboratory of Autonomous Intelligent Unmanned Systems Tongji UniversityShanghai 201804China

Organic electrochemical transistors(OECTs)have emerged as one type of promising building block for neuromorphic systems owing to their capability of mimicking the morphology and functions of biological neurons and ***,numerous kinds of OECTs have been developed,while self-healing performance has been neglected in most reported *** this work,the OECTs using self-healing polymer electrolytes as dielectric layers are *** important synaptic behaviors are simulated in the OECTs by doping the channel layers with ions from the *** from the dynamic hydrogen bonds in the self-healing polymer electrolytes,the OECTs can successfully maintain their electrical performance and the ability of emulating synaptic behaviors after self-healing compared with the initial *** significantly,the sublinear spatial summation function is demonstrated in the OECTs and their potential in flexible electronics is also *** results suggest that our devices are expected to be a vital component in the development of future wearable and bioimplantable neuromorphic systems.

关键词： Organic electrochemical transistors Artificial synapses Synaptic behaviors Self-healing Flexibility

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Superlubricity achieved by polyvinylpyrrolidone at Si3N4/sapphire interfaces

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摩擦（英文版） 2025年第6期13卷 112-121页

作者： Hongdong Wang Zhen Luo Kunpeng Wang Yuhong Liu Jianhua Zhang School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China School of Mechatronic Engineering and Automation and Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai UniversityShanghai 200444China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China

Polymers have complex molecular structures that often lead to interchain friction and hinder movement,making it difficult to achieve ***,in the field of hydration lubrication,the electronegative interface of ceramics readily adsorbs water molecules,creating a protective water film that covers the frictional interface and effectively reduces *** achieve hydration lubrication,it is essential to create a continuous lubricating film by selectively enriching specific functional groups of adsorbed water molecules from the polymer solution onto the ceramic *** adsorbing a hydrophilic layer composed of polyvinylpyrrolidone with pyrrolidone groups onto a negatively charged Si3N4/sapphire interface,we formed a continuous lubricating *** has shown that the interaction between the polymer chain structure of polyvinylpyrrolidone molecules(such as PVP10000)in solution and water molecules could result in excellent *** the contact pressure exceeds 198 MPa,the coefficients of friction(COF)can be reduced to *** detailed surface analyses and sophisticated simulations,we uncovered the underlying mechanism *** pyrrolidone moieties of polyvinyl pyrrolidone(PVP)formed hydrogen bonds with the Si3N4 surface,transforming the initially difficult frictional interface into a PVP/sapphire interface with significantly reduced sliding energy *** findings highlight the vital role of PVP in superlubricity and hydration lubrication and provide a theoretical and experimental basis for the design of materials and lubricants with exceptional lubricating properties.

关键词： superlubricity polyvinyl pyrrolidone(PVP) hydration lubrication molecular simulation

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Enhanced Privacy-Preserving WiFi Fingerprint Localization from CL Encryption

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Chinese Journal of Electronics 2024年第6期33卷 1435-1446页

作者： Zhiwei WANG Qiuchi ZHU Zhenqi ZHANG School of Computer Nanjing University of Posts and Telecommunications State Key Laboratory of Public Big Data Guizhou University Advanced Cryptography and System Security Key Laboratory of Sichuan Province Chengdu University of Information Engineering Key Laboratory of Computational Science and Application of Hainan Province Hainan Normal University

The WiFi fingerprint-based localization method is considered one of the most popular techniques for indoor localization. In INFOCOM'14, Li et al. proposed a wireless fidelity(WiFi) fingerprint localization system based on Paillier encryption, which is claimed to protect both client C 's location privacy and service provider S's database privacy. However, Yang et al. presented a practical data privacy attack in INFOCOM'18, which allows a polynomial time attacker to obtain S's database. We propose a novel WiFi fingerprint localization system based on CastagnosLaguillaumie(CL) encryption, which has a trustless setup and is efficient due to the excellent properties of CL encryption. To prevent Yang et al.'s attack, the system requires that S selects only the locations from its database that can receive the nonzero signals from all the available access points in C 's nonzero fingerprint in order to determine C's location. Security analysis shows that our scheme is secure under Li et al.'s threat model. Furthermore, to enhance the security level of privacy-preserving WiFi fingerprint localization scheme based on CL encryption, we propose a secure and efficient zero-knowledge proof protocol for the discrete logarithm relations in C's encrypted localization queries.

关键词： Location awareness Threat modeling Data privacy Protocols Databases Fingerprint recognition Trustless services Encryption Servers Wireless fidelity

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A skin-conformal and breathable humidity sensor for emotional mode recognition and non-contact human-machine interface

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npj Flexible Electronics 2024年第1期8卷 929-937页

作者： Tongkuai Li Tingting Zhao Hao Zhang Li Yuan Congcong Cheng Junshuai Dai Longwei Xue Jixing Zhou Hai Liu Luqiao Yin Jianhua Zhang Key Laboratory of Advanced Display and System Application Ministry of EducationShanghai University149 Yanchang RoadShanghai 200072China Shanghai Key Laboratory of Intelligent Manufacturing and Robotics Shanghai University333 Nanchen RoadShanghai 200444China School of Microelectronics Shanghai University20 Chengzhong RoadShanghai 201800China

Noncontact humidity sensor overcomes the limitations of its contact sensing counterparts,including mechanical wear and cross infection,which becomes a promising candidate in healthcare and human-machine interface ***,current humidity sensors still suffer the ubiquitous issue of uncomfortable wear and skin irritation hindering the long-term *** this study,we report a skin-conformal and breathable humidity sensor assembled by anchoring MXenes-based composite into electrospun elastomer nanofibers coated with a patterned *** composite is highly sensitive to the water molecules due to its large specific surface area and abundant water-absorbing hydroxyl groups,while the elastomeric nanofibers provide an ultrathin,highly flexible,and permeable substrate to support the functional materials and *** sensor presents not only excellent air permeability(0.078 g cm^(−2)d^(−1)),high sensitivity(S=704),and fast response/recovery(0.9 s/0.9 s),but also high skin conformability and ***,this humidity sensor is confirmed to realize the recognition of motional states and emotional modes,which provides a way for the advanced noncontact human-machine interface.

关键词： composite interface conformal

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Experimental study of the circular subsonic pipe jet expanding into near vacuum environment

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Science China(Physics,Mechanics & Astronomy) 2025年

作者： Xin Chen Fangyuan Liu Yu-Ze Wang Si-Yu Zhang Qingxiang Li Jian-Zhao Wu Bo-Fu Wang Kai Leong Chong Cheng Wang Jian-Hua Zhang Quan Zhou Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai Institute of Applied Mathematics and MechanicsSchool of Mechanics and Engineering Science Shanghai University Zhangjiang Laboratory School of Microelectronics Key Laboratory of Advanced Display and System Application of Ministry of EducationShanghai University

In extreme ultraviolet(EUV) lithography, mitigation of tin(Sn) debris contamination during EUV light generation is an important issue. In practice, the high-speed jet flows are used to transport debris away from the collector mirror, thereby protecting it and improving system performance. Since EUV light is generated in a near-vacuum environment, understanding jet flow behavior in these extreme conditions is crucial for effective contamination control. In this study, we introduce a new facility designed to investigate jet extruded into near-vacuum environments using particle image velocimetry(PIV) and particle tracking velocimetry(PTV). Our results reveal a significantly extended potential core and a “top-hat” velocity profile with an inlet flow rate of 0.28standard liter per minute(SLPM) and ambient pressure of 13.9 Pa. We also investigate the effects of inlet flow rate, ambient pressure, and jet diameter on the centerline streamwise velocity of the jet flow. These findings aim to guide the design of equipment operating in vacuum conditions.

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A Generic Image Feature Extraction Method Towards Multiple Vision Tasks 9th

A Generic Image Feature Extraction Method Towards Multiple V...

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9th International Forum on Digital Multimedia Communication, IFTC 2022

作者： Wei, Jiao An, Ping Huang, Kunqiang Yang, Chao Ma, Ran School of Communication and Information Engineering Shanghai University Shanghai200444 China Key Laboratory for Advanced Display and System Application Ministry of Education Shanghai200072 China

ISBN: (纸本)9789819908554

With the developments of artificial intelligence and image processing technology, the study of multiple vision tasks has become a hot topic in the field of computer vision, and the key to implementing vision tasks lies in the feature extraction of images. To meet the demands of modern life for multiple vision tasks and promote the deployment of artificial intelligence on edge devices, we propose an image feature extraction method applied to multiple vision tasks, which promotes the deployment of artificial intelligence on edge devices. Firstly, the function of the secondary task in multi-task learning is combined with a feature migration strategy to build a feature migration model for multiple vision tasks. Then, a generic feature extraction model based on feature fusion and feature migration is established under the guidance of image classification. The experimental results show that the proposed feature migration model with image classification as the secondary task can improve the mAP (mean average precision) of the target detection by 5.5%, and the feature migration model with target detection as the secondary task can improve the average accuracy of the image classification by 1%. The proposed generic feature extraction model can effectively implement the image classification and target detection tasks. © 2023, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Feature extraction

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