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Achieving ultrafast superlubricity with layered double hydroxides

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Nano Research 2023年第5期16卷 6940-6950页

作者： kunpeng wang Yuhong Liu Hongdong wang Jianbin Luo State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China School of Mechatronic Engineering Shanghai UniversityShanghai 200444China

Layered double hydroxides(LDHs)have the potential to be superlubricated materials due to their strong adsorption effect and weak internal ***,obtaining stable superlubricity during the ultrafast time(<10 s)is still a ***,we demonstrated macroscale superlubricity based on LDHs of multiple metal ions at high surface roughness,achieving superlow friction coefficients(0.006)and ultrafast wearing-in time(<7 s),which mainly originated from tribochemical reactions and the formation of nanostructured adsorption *** cross-sectional analysis and density functional theory,we revealed the properties of the protective tribofilm to achieve ultrafast *** strongly adsorbed on the surface of the bearing steel,the sliding interface transformed into a heterogeneous interface between the polytetrafluoroethylene and LDH,leading to macroscale *** findings demonstrate that tribochemical treatment of surfaces produces tribofilm that effectively reduces wearing-in time and promotes ultralow friction.

关键词： superlubricity ultrafast wearing-in time bearing steel LDH nanosheets sliding barrier

Hash-based signature revisited

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Cybersecurity 2022年第4期5卷 71-96页

作者： Lingyun Li Xianhui Lu kunpeng wang State Key Laboratory of Information Security Institute of lnformation EngineeringCASNo.89 Minzhuang RoadHaidian DistrictBeijing 100093China School of Cyber Security University of Chinese Academy of SciencesNo.19 Yuquan RoadShijingshan DistrictBeijing 100049China School of Computer Science Liaocheng UniversityNo.1Hunan RoadDongchangfu DistrictLiaochengCity 252000China.

The current development toward quantum attack has shocked our confidence on classical digital signature *** one of the mainstreams of post quantum cryptography primitives,hash-based signature has attracted more and more concern in both cryptographic research and application in recent *** goal of this paper is to present,classify and discuss different solutions for hash-based ***,this paper discusses the research progress in the component of hash-based signature,i.e.,one-time signature and few-time signature;then classifies the tree-based public key authentication schemes of hash-based signature into limited number and stateful schemes,unlimited number and stateful schemes and unlimited number and stateless *** above discussion aims to analyze the overall design idea of different categories of hash-based signatures,as well as the construction,security reduction and performance efficiency of specific ***,the perspectives and possible development directions of hash-based signature are briefly discussed.

关键词： Hash-based signature One-time signature Few-time signature Hash tree

Montgomery Algorithm over a Prime Field

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Chinese Journal of Electronics 2019年第1期28卷 39-44页

作者： YU Wei wang kunpeng LI Bao TIAN Song State Key Laboratory of Information Security the Institute of Information EngineeringChinese Academy of Sciences Data Assurance and Communication Security Research Center Chinese Academy of Sciences University of Chinese Academy of Sciences

New formulae for point addition and point doubling on elliptic curves over prime fields are *** on these formulae, an improved Montgomery algorithm is proposed. The theoretical analysis indicates that it is about 13.4% faster than Brier and Joye’s Montgomery algorithm. Experiments on the elliptic curve over a 256-bit prime field recommended by the National Institute of Standards and Technology and over a 256-bit prime field in Chinese elliptic curve standard SM2 support the theoretical analysis.

关键词： Elliptic curve Montgomery algorithm Scalar multiplication

Modulation mechanism of electron energy dissipation on superlubricity based on fluorinated 2D ZIFs

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Nano Research 2024年第4期17卷 3198-3209页

作者： Yuxin Li Lei Liu kunpeng wang Yuhong Liu State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China School of Mechatronic Engineering Shanghai UniversityShanghai 200444China

Electron energy dissipation is an important energy dissipation pathway that cannot be ignored in friction ***-dimensional zeolite imidazole frameworks(2D ZIFs)and fluorine doping strategies give 2D Zn-ZIF and 2D Co-ZIF unique electrical properties,making them ideal materials for studying electron energy dissipation *** this paper,based on the superlubricity modulation of 2D fluoridated ZIFs,the optimal tribological properties are obtained on the 2D F-Co-ZIF surface,with the friction coefficient as low as *** experiments,density functional theory(DFT)simulation,and fluorescence detection are used to explain the mechanism of fluorine doping regulation of tribological properties from the two stages,namely energy transfer and energy ***,the energy will transfer into the friction system through the generation of electron–hole pairs under an external excitation,and release by radiation and non-radiation energy dissipation *** reduces energy transfer by altering the electronic properties and band structures of ZIFs,and slows down the charge transfer by enhancing the shielding efficiency,thus slowing the non-radiative energy dissipation rate during the energy release *** insights not only help us better understand the role of fluorine doping in improving tribological properties,but also provide a new way to further explore the electron energy dissipation pathway during friction.

关键词： superlubricity electron energy dissipation modulation two-dimensional zeolite imidazole frameworks(2D ZIFs) fluorination

Optimized Mask-RCNN model for particle chain segmentation based on improved online ferrograph sensor

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Friction 2024年第6期12卷 1194-1213页

作者： Shuo wang Miao WAN Tonghai WU Zichen BAI kunpeng wang Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System Xi’an Jiaotong UniversityXi’an 710049China

Ferrograph-based wear debris analysis(WDA)provides significant information for wear fault analysis of mechanical *** decades of offline application,this conventional technology is being driven by the online ferrograph sensor for real-time wear state ***,online ferrography has been greatly limited by the low imaging quality and segmentation accuracy of particle chains when analyzing degraded lubricant oils in practical *** address this issue,an integrated optimization method is developed that focuses on two aspects:the structural re-design of the online ferrograph sensor and the intelligent segmentation of particle *** enhancing the imaging quality of wear particles,the magnetic pole of the online ferrograph sensor is optimized to enable the imaging system directly observe wear particles without penetrating ***,a light source simulation model is established based on the light intensity distribution theory,and the LED installation parameters are determined for particle illumination uniformity in the online ferrograph *** this basis,a Mask-RCNN-based segmentation model of particle chains is constructed by specifically establishing the region of interest(ROI)generation layer and the ROI align layer for the irregular particle *** these measures,a new online ferrograph sensor is designed to enhance the image acquisition and information extraction of wear *** verification,the developed sensor is tested to collect particle images from different degraded oils,and the images are further handled with the Mask-RCNN-based model for particle feature *** results reveal that the optimized online ferrography can capture clear particle images even in highly-degraded lubricant oils,and the illumination uniformity reaches 90%in its imaging *** importantly,the statistical accuracy of wear particles has been improved from 67.2%to 94.1%.

关键词： wear particle analysis online ferrography particle image acquisition particle chain segmentation

On the Construction of Mohr Stress Circle and a Graphic Method in Representing the Stress Components on Different Oblique Planes

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上海交通大学学报 2004年第z2期38卷 223-228页

作者： Zhubin He Z. R. wang kunpeng Kang School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China School of Materials Science and Engineering Harbin Institute of Technology Harbin150001 China Department of Computer Science Shangqiu Normal University Shangqiu476000 China

The Mohr stress circle for three-dimensional stress is usually determined by equations,which is lack of intuitionistic meanings and difficult to understand. In this paper, the construction of Mohr stress circle is illustrated directly by numerical method. The shortcoming of Mohr stress circle in representing the stress components on different oblique planes for three-dimensional stress is analyzed. A three-dimensional figure is given to describe the variation of normal and shear stress on different oblique planes at one point for the first time.

关键词： Mohr stress circle Graphic method normal stress shear stress

Tribological properties of novel palygorskite nanoplatelets used as oil-based lubricant additives

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Friction 2021年第2期9卷 332-343页

作者： kunpeng wang Huaichao WU Hongdong wang Yuhong LIU Lv YANG Limei ZHAO School of Mechanical Engineering Guizhou UniversityGuiyang 550025China State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

Layered palygorskite(PAL),commonly called attapulgite,is a natural inorganic clay mineral composed of magnesium *** this study,an aqueous miscible organic solvent treatment method is adopted to prepare molybdenum-dotted palygorskite(Amo-PMo)nanoplatelets,which greatly improved the specific surface area of PAL and the dispersion effect in an oil-based lubricant *** layered structure and size were confirmed using transmission electron microscopy(TEM)and atomic force *** a tribological test lubricated with three additives(PAL,organic molybdenum(SN-Mo),and Amo-PMo),it was found that the sample of 0.5 wt%Amo-PMo exhibited the best tribological properties with a coefficient of friction of ***,the resulting wear scar diameter and wear volume of the sliding ball surface were 63%and 49.6%of those lubricated with base oil,*** excellent lubricating performance and self-repairing ability were mainly attributed to the generated MoS2 adsorbed on the contact surfaces during the tribochemical reaction,thereby effectively preventing the direct collision between asperities on sliding solid ***,as-prepared Amo-PMo nanoplatelets show great potential as oil-based lubricant additives,and this study enriches the existing application of PAL in industry.

关键词： palygorskite(PAL) layered material lubricant additive wear tribofilm

Security estimation of LWE via BKW algorithms

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Cybersecurity 2024年第1期7卷 71-87页

作者： Yu Wei Lei Bi Xianhui Lu kunpeng wang SKLOIS Institute of Information EngineeringCASBeijingChina School of Cyber Security University of Chinese Academy of SciencesBeijingChina

The Learning With Errors(LWE)problem is widely used in lattice-based cryptography,which is the most promising post-quantum cryptography *** are a variety of LWE-solving methods,which can be classified into four groups:lattice methods,algebraic methods,combinatorial methods,and exhaustive *** Blum–Kalai–Wasserman(BKW)algorithm is an important variety of combinatorial algorithms,which was first presented for solving the Learning Parity With Noise(LPN)problem and then extended to solve *** this paper,we give an overview of BKW algorithms for solving *** introduce the framework and key techniques of BKW algorithms and make comparisons between different BKW algorithms and also with lattice methods by estimating concrete security of specific LWE *** also briefly discuss the current problems and potential future directions of BKW algorithms.

关键词： Post-quantum cryptography Learning with errors problem Lattice-based cryptography Security estimation

Decoratable hybrid-film-patch stabilized Pickering emulsions and their catalytic applications

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Nano Research 2015年第8期8卷 2603-2610页

作者： Shenghua Ma Yinan wang kunpeng Jiang Xiaojun Han State Key Laboratory of Urban Water Resource and Environment School of Chemical Engineering and Technology Harbin Institute ofTechnology Harbin 150001 China

We demonstrated a method to fabricate functional hybrid film patches that were used to form Pickering emulsions （PEs）. The hybrid patches were made of carbon nanotubes, Fe3O4 nanoparticles, octadecyltrimethoxysilane, and poly（diallyldimethylammonium chloride）. The aqueous phase of the hybridpatch stabilized PEs can be easily separated by applying a magnetic field. The hybrid-film-patch stabilized PEs are extremely stable and lasted for eight months at room temperature. Furthermore, they are easily ruptured by adding ethanol, and regenerated by vortexing the patches in aqueous/oil mixtures, enabling the inner hydrophilic side of the patches to be easily modified with metal nanoparticles. As an example, palladium nanoparticles were embedded into the surface of the hybrid patches using an in situ reduction method. The Pd functionalized patch formed PEs showed an excellent catalytic performance for the hydrogenation of acetone with a yield of 99.5%. The same batch of Pd functionalized patches was recycled 13 times without loss of the catalytic activity. The hybrid-patch formed PEs have a great potential in the catalytic field.

关键词： Pickering emulsion hybrid film patches catalysis carbon nanotubes Fe3O4 nanoparticles