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Non-specific/specific SERS spectra concatenation for precise bacteria classifications with few samples using a residual neural network

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Chinese Chemical Letters 2025年第1期36卷 484-490页

作者： Feihu Wu Gengwen Chen Kaitao Lai Shiqing Zhang Yingchao Liu Ruijian Luo Xiaocong Wang Pinzhi Cao Yi Ye Jiarong Lian Junle Qu zhigang yang Xiaojun Peng Shenzhen Key Laboratory of Photonics and Biophotonics&College of Physics and Optoelectronic Engineering Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceShenzhen UniversityShenzhen 518060China Hematology Reagent R&D department Mindray Bio-medical Electronics Co.LTD.Shenzhen 518107China State Key Laboratory of Fine Chemicals College of Material Science and EngineeringShenzhen UniversityShenzhen 518060China

Deep learning neural network incorporating surface enhancement Raman scattering technique(SERS)is becoming as a powerful tool for the precise classifications and diagnosis of bacterial ***,the large amount of sample requirement and time-consuming sample collection severely hinder its *** herein propose a spectral concatenation strategy for residual neural network using nonspecific and specific SERS spectra for the training data augmentation,which is accessible to acquiring larger training dataset with same number of SERS spectra or same size of training dataset with fewer SERS spectra,compared with pure non-specific SERS *** this strategy,the training loss exhibit rapid convergence,and an average accuracy up to 100%in bacteria classifications was achieved with50 SERS spectra for each kind of bacterium;even reduced to 20 SERS spectra per kind of bacterium,classification accuracy is still>95%,demonstrating marked advantage over the results without spectra *** method can markedly improve the classification accuracy under fewer samples and reduce the data collection workload,and can evidently enhance the performance when used in different machine learning models with high generalization ***,this strategy is beneficial for rapid and accurate bacteria classifications with residual neural network.

关键词： SERS Deep learning Resnet Bacteria classification Spectra concatenation

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Structural Nonlinear Flutter Characteristics Analysis for an Actuator-fin System with Dynamic Stiffness

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Chinese Journal of Aeronautics 2011年第5期24卷 590-599页

作者： yang Ning WU zhigang yang Chao School of Aeronautic Science and Engineering Beihang University Beijing 100191 China

The flutter characteristics of an actuator-fin system are investigated with structural nonlinearity and dynamic stiffness of the electric motor. The component mode substitution method is used to establish the nonlinear governing equations in time domain and frequency domain based on the fundamental dynamic equations of the electric motor and decelerator. The existing describing function method and a proposed iterative method are used to obtain the flutter characteristics containing preload freeplay nonlinearity when the control command is zero. A comparison between the results of frequency domain and those of time domain is studied. Simulations are carried out when the control command is not zero and further analysis is conducted when the freeplay angle is changed. The results show that structural nonlinearity and dynamic stiffness have a significant influence on the flutter characteristics. Limit cycle oscillations （LCOs） are observed within linear flutter boundary. The response of the actuator-fin system is related to the initial disturbance. In the nonlinear condition, the amplitude of the control command has an influence on the flutter characteristics.

关键词： aeroelasticity flutter actuators dynamic stiffness structural nonlinearity component mode substitution method describing functions

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Antibacterial Property and Precipitation Behavior of Ag-Added304 Austenitic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2014年第3期27卷 539-545页

作者： yang Xuan Chi Zhang Nianqing Fan zhigang yang School of Materials Science and Engineering Tsinghua University Suzhou Nuclear Power Research Institute

A 304 stainless steel with the addition of 0.27 wt% Ag was found to exhibit excellent antibacterial properties. Based on Thermo-Calc calculation, a special heat treatment was introduced to obtain Ag precipitate in this steel. Anti- bacterial experiments show that the alloy can kill the adhering Escherichia coli effectively. Since the Ag element plays a key role in killing the adhered bacteria, microstructures of Ag and Ag-rich compounds were characterized by scanning electron microscopy and transmission electron microscopy. Ag-rich compounds with the size of a few microns were found to be embedded within the matrix and along grain boundaries, Moreover, pure Ag particles with a lattice parameter of 0.422 nm were found within the austenite matrix. The orientation relationship between the matrix and Ag particles was identified. Nano-sized Ag particles were precipitated during heat treatment, and the interfacial energy between Ag precipitates and matrix was determined by Becket＇s model calculation.

关键词： 304 Stainless steel Ag addition Precipitation Antibacterial property

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Measurement of the flow structures in the wakes of different types of parachute canopies

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Acta Mechanica Sinica 2018年第2期34卷 225-237页

作者： Sylvio Pasqualini Zheyan Jin zhigang yang School of Aerospace Engineering and Applied Mechanics Tongji UniversityShanghai 200092China Shanghai Key Lab of Vehicle Aerodynamics and Vehicle Thermal Management Systems Shanghai 201804China

We measured flow structures with stereoscopic particle image velocimetry(stereo-PIV) in the turbulent wakes of three parachute canopies, which had the same surface area, but different geometries. The tested parachute canopies included ribbon canopy, 8-branches canopy, and cross canopy. The obtained results showed that the geometry of the parachute canopies had significant influences on the flow structures in the wakes of these three canopies. In addition, the variation of Reynolds number did not lead to a dramatic change in the distributions of velocity, vorticity,Reynolds stress, and turbulent kinetic energy.

关键词： Parachute canopies Wake structures Particle image velocimetry

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A fine-grained intrusion protection system for inter-edge trust transfer

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Digital Communications and Networks 2024年第5期10卷 1365-1374页

作者： Boran yang Dapeng Wu Ruyan Wang zhigang yang Yu yang School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing400065China Advanced Network and Intelligent Connection Technology Key Laboratory of Chongqing Education Commission of China Chongqing400065China Chongqing Key Laboratory of Ubiquitous Sensing and Networking Chongqing400065China

The phenomenal popularity of smart mobile computing hardware is enabling pervasive edge intelligence and ushering us into a digital twin ***,the natural barrier between edge equipment owned by different interested parties poses unique challenges for cross-domain trust *** addition,the openness of radio access and the accessibility of edge services render edge intelligence systems vulnerable and put sensitive user data in *** paper presents an intrusion protection mechanism for edge trust transfer to address the inter-edge trust management issue and the conundrum of detecting indistinguishable malevolent nodes launching weak ***,an inter-edge reputation transfer framework is established to leverage the trust quality of different edges to retain the accumulated trust histories of users when they roam in multi-edge environments ***,a fine-grained intrusion protection system is proposed to reduce the negative impact of attacks on user interactions and improve the overall trust quality and system security of edge intelligence *** experimental results validate the effectiveness and superior performance of the proposed intrusion protection for edge trust transfer in securing,enhancing,and consolidating edge intelligence services.

关键词： Edge computing Cross-domain trust management Trust transfer Intrusion protection

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UTM:A trajectory privacy evaluating model for online health monitoring

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Digital Communications and Networks 2021年第3期7卷 445-452页

作者： zhigang yang Ruyan Wang Dapeng Wu Daizhong Luo School of Communication and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing400065China School of Artificial Intelligence Chongqing University of Arts and SciencesChongqing402160China Key Laboratory of Optical Communication and Networks Chongqing400065China Key Laboratory of Ubiquitous Sensing and Networking Chongqing400065China

A huge amount of sensitive personal data is being collected by various online health monitoring *** the data is anonymous,the personal trajectories(e.g.,the chronological access records of small cells)could become the anchor of linkage attacks to re-identify the *** on trajectory privacy in online health monitoring,we propose the User Trajectory Model(UTM),a generic trajectory re-identification risk predicting model to reveal the underlying relationship between trajectory uniqueness and aggregated data(e.g.,number of individuals covered by each small cell),and using the parameter combination of aggregated data to further mathematically derive the statistical characteristics of uniqueness(i.e.,the expectation and the variance).Eventually,exhaustive simulations validate the effectiveness of the UTM in privacy risk evaluation,confirm our theoretical deductions and present counter-intuitive insights.

关键词： Online health monitoring Trajectory privacy User trajectory model Aggregated data Uniqueness

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Influence of ground effect on flow field structure and aerodynamic noise of high-speed trains

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第2期25卷 147-160页

作者： Xiaoming TAN Linli GONG Xiaohong ZHANG zhigang yang Key Laboratory of Intelligent Manufacturing and Service Performance Optimization of Laser and Grinding in Mechanical Industry Hunan Institute of Science and TechnologyYueyang414000China Key Laboratory of Traffic Safety on Track(Central South University) Ministry of EducationSchool of Traffic&Transportation EngineeringCentral South UniversityChangsha410075China

The simulation of the ground effect has always been a technical difficulty in wind tunnel tests of high-speed *** this paper,large eddy simulation and the curl acoustic integral equation were used to simulate the flow-acoustic field results of high-speed trains under four ground simulation systems(GSSs):“moving ground+rotating wheel”,“stationary ground+rotating wheel”,“moving ground+stationary wheel”,and“stationary ground+stationary wheel”.By comparing the fluid-acoustic field results of the four GSSs,the influence laws of different GSSs on the flow field structure,aero-acoustic source,and far-field radiation noise characteristics were investigated,providing guidance for the acoustic wind tunnel testing of high-speed *** calculation results of the aerodynamic noise of a 350 km/h high-speed train show that the moving ground and rotating wheel affect mainly the aero-acoustic performance under the train *** influence of the rotating wheel on the equivalent sound source power of the whole vehicle was not more than 5%,but that of the moving ground slip was more than 15%.The average influence of the rotating wheel on the sound pressure level radiated by the whole vehicle was 0.3 dBA,while that of the moving ground was 1.8 dBA.

关键词： High-speed train Aero-acoustics Flow field structure Large eddy simulation Moving ground condition Rotating wheel

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An experimental investigation into the icing and melting process of a water droplet impinging onto a superhydrophobic surface

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Science China(Physics,Mechanics & Astronomy) 2013年第11期56卷 2047-2053页

作者： JIN ZheYan JIN SongYue yang zhigang School of Aerospace Engineering and Applied Mechanics Tongji University School of Automotive Studies Tongji University Shanghai Automotive Wind Tunnel Center

The freezing and melting process of a small water droplet on a superhydrophobic cold surface was investigated using the Laser Induced Fluorescence(LIF)*** superhydrophobic surface was prepared using a sol-gel method on a red copper test *** the obtained fluorescence images,the phase transition characteristics during the freezing and melting process of a water droplet were clearly *** was found that,at the beginning of the droplet freezing process,liquid water turned into ice at a very fast *** phase transition process decreased gradually with time and the volume of frozen ice approached a constant value at the end of the icing *** addition,the freezing time was found to reduce with the decrease of the test plate ***,when the test plate temperature is relatively high,the effect of droplet volume on the freezing time is very *** all,we provide some tentative insights into the microphysical process related to the icing and melting process of water droplets.

关键词： sol-gel icing melting superhydrophobic surface water droplet

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高强钢中亚稳奥氏体对断裂韧性影响的研究进展

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金属学报 2025年第1期61卷 77-87页

作者：唐景韬姚英杰张游游吴文华李宇博陈浩杨志刚清华大学材料学院教育部先进材料重点实验室北京100084

超高强度钢中亚稳奥氏体调控是协同提升其强塑性的重要策略。亚稳奥氏体在拉伸变形过程中能够通过形变诱发马氏体相变来延迟颈缩并增强材料的加工硬化能力。在超高强度钢部件轻量化及载荷复杂化的趋势下,迫切需要进一步提升其断裂韧性,... 详细信息

超高强度钢中亚稳奥氏体调控是协同提升其强塑性的重要策略。亚稳奥氏体在拉伸变形过程中能够通过形变诱发马氏体相变来延迟颈缩并增强材料的加工硬化能力。在超高强度钢部件轻量化及载荷复杂化的趋势下,迫切需要进一步提升其断裂韧性,在保证强塑性的基础上,如何利用亚稳奥氏体相增韧是当前研究的重点之一。亚稳奥氏体可以通过相变过程及与裂纹的相互作用导致裂纹的偏转/钝化,来提高材料断裂韧性,但相变产生的新鲜马氏体具有本征脆性,同时微观结构中复杂的力学配分行为改变了裂纹尖端的应力状态,导致相变增韧效应的减弱甚至材料的脆化。本文综述了亚稳奥氏体对高强钢断裂韧性影响的研究进展,总结了其增韧及脆化机制,并展望了未来面向协同强韧化的亚稳奥氏体设计及理论研究。

关键词：亚稳奥氏体断裂韧性相变

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Enhancing the Hydrogen Embrittlement Resistance of Medium Mn Steels by Designing Metastable Austenite with a Compositional Core-shell Structure

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Acta Metallurgica Sinica(English Letters) 2023年第7期36卷 1059-1077页

作者： Jun Zhang Binhan Sun zhigang yang Chi Zhang Hao Chen Key Laboratory for Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Pressure Systems and Safety Ministryof EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China

Deformation-induced martensite transformation from metastable retained austenite is one of the most efficient strain-hardening mechanisms contributing to the enhancement of strength-ductility synergy in advanced high-strength ***,the hard transformation product(often-martensite)and the H redistribution associated with phase transformation essentially decrease materials’resistance to hydrogen *** solve this fundamental conflict,we introduce a new microstructure architecting strategy based on an accurately design of core–shell compositional distribution inside the austenite *** employed this approach in a typical medium Mn steel(8 wt.%Mn)with an ultrafine grained austenite-ferrite *** produced a high Mn content(15–16 wt.%)in the austenite shell region and a low Mn content(~12 wt.%)in the core region,through a thermodynamics-guided two-step austenite reversion *** room-temperature deformation,the austenite core transforms continuously starting from a low strain,providing a high and persistent strain-hardening *** transformation of Mn-rich austenite shell,on the other hand,occurs only at the latest regime of the deformation,thus effectively inhibiting the nucleation of H-induced cracks at ferrite/deformation-induced martensite interfaces as well as suppressing their growth and *** step-wise transformation,tailored directly targeted to protect the hydrogen-sensitive microstructure defects(interfaces),results in a significantly enhanced hydrogen embrittlement resistance without sacrificing the mechanical performance in hydrogen-free *** design of compositional core–shell structure is expected to be applicable to,at least,other multiphase advanced high-strength steels containing metastable austenite.

关键词： Medium Mn steels Hydrogen embrittlement Core-shell austenite Chemical heterogeneity Deformationinduced martensite transformation

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