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Finite-Time Attack Detection and Secure State Estimation for Cyber-Physical Systems

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IEEE/CAA Journal of Automatica Sinica 2023年第10期10卷 2032-2034页

作者： Mi lv Yuezu lv Wenwu Yu Haofei Meng School of Cyber Science and Engineering Southeast UniversityNanjing 210096China School of Mathematics Southeast UniversityNanjing 210096China School of Automation Southeast UniversityNanjing 210096China

Dear Editor, This letter aims to investigate the problem of attack detection and state estimation when the system suffers from external malicious attacks. A finite-time reduce-order observer is designed, which can achieve attack detection at the preset time instant. Meanwhile, it is shown that the protection of the key nodes greatly improves the efficiency of secure state estimation. Finally, the proposed theory is applied to a general cyber-physical system to illustrate its effectiveness.

关键词： estimation Secure system

Microstructure and mechanical performance of AZ31/6061 lap joints welded by laser-TIG hybrid welding with Zn-Al alloy filler metal

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Journal of Magnesium and Alloys 2024年第8期12卷 3325-3338页

作者： Xinze lv Liming Liu Key Laboratory of Liaoning Advanced Welding and Joining Technology School of Materials Science and EngineeringDalian University of TechnologyDalian116024China

A series of Zn-xAl(x=0-35 wt.%)alloy filler metals were designed to join AZ31 Mg alloy to 6061 Al alloy by laser-TIG hybrid *** effect of Al content on the wettability of filler metals,microstructure evolution and strength of joint was *** results indicated that the strength of joints was improved with the increase of Al content in filler *** Zn-15Al filler was used,the ultimate fracture load reached the maximum of 1475.3 N/cm,which was increased by 28%than that with pure Zn *** reason is that the Al element acts as a"reaction depressant"in filler metal,which contributes to inhibiting the dissolution of Mg base metal and the Mg-Zn *** addition of appropriate quantity of Al element promoted the precipitation of Al-rich solid solution instead of Zn solid *** MgZn_(2) IMCs have lower lattice mismatch with Al solid solution than Zn solid solution,thus the strength of joints is ***,the excessive addition of Al caused the formation of brittle Mg32(Al,Zn)49 ternary compounds,leading to the deterioration of joint performance.

关键词： Laser-TIG hybrid welding Mg-Al dissimilar joint Intermetallic compounds Microstructure Fracture

Modeling the measurement precision of Fringe Projection Profilometry

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Light(Science & Applications) 2023年第11期12卷 2480-2497页

作者： Shenzhen lv Qian Kemao School of Computer Science and Engineering Nanyang Technological UniversitySingaporeSingapore

Three-dimensional(3D)surface geometry provides elemental information in various sciences and precision *** Projection Profilometry(FPP)is one of the most powerful non-contact(thus non-destructive)and non-interferometric(thus less restrictive)3D measurement techniques,featuring at its high ***,the measurement precision of FPP is currently evaluated experimentally,lacking a complete theoretical model for *** propose the first complete FPP precision model chain including four stage models(camera intensity,fringe intensity,phase and 3D geometry)and two transfer models(from fringe intensity to phase and from phase to 3D geometry).The most significant contributions include the adoption of a non-Gaussian camera noise model,which,for the first time,establishes the connection between camera’s electronics parameters(known in advance from the camera manufacturer)and the phase precision,and the formulation of the phase to geometry transfer,which makes the precision of the measured geometry representable in an explicit and concise *** a result,we not only establish the full precision model of the 3D geometry to characterize the performance of an FPP system that has already been set up,but also explore the expression of the highest possible precision limit to guide the error distribution of an FPP system that is yet to *** theoretical models make FPP a more designable technique to meet the challenges from various measurement demands concerning different object sizes from macro to micro and requiring different measurement precisions from a few millimeters to a few micrometers.

关键词： sizes concerning formulation

Designing and optimizing a parallel neural network model for predicting the solubility of diosgenin in n-alkanols

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Chinese Journal of Chemical Engineering 2021年第1期34卷 288-294页

作者： Huichao lv Dayong Tian School of Chemical&Environmental Engineering Anyang Institute of TechnologyAnyang 455000China

Accurate estimation of the solubility of a chemical compound is an important issue for many industrial proce *** overcome the defects of some thermodynamic models and simple correlations,a parallel neural network(PNN) model was conceived and optimized to predict the solubility of diosgenin in seven n-alkanols(C_(1)-C_(7)).The linear regression analysis of the parity plots indicates that the PNN model can give more accurate descriptions of the solubility of diosgenin than the ordinary neural network(ONN) *** comparison of the average root mean square deviation(RMSD) shows that the suggested model has a slight advantage over the thermodynamic NRTL model in terms of the calculating ***,the PNN model can reflect the effects of the temperature and the chain length of the alcohol solvent on the solution behavior of diosgenin correctly and can estimate its solubility in the n-alkanols with more carbon atoms.

关键词： Solubility Diosgenin Parallel neural network model NRTL model

Seismic response characteristics of nuclear island structure at generic soil and rock sites

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Earthquake Engineering and Engineering Vibration 2023年第3期22卷 667-688页

作者： lv Hao Chen Shaolin Department of Civil and Airport Engineering Nanjing University of Aeronautics and AstronauticsNanjing 211106China College of Safety and Environmental Engineering Shandong University of Science and TechnologyQingdao 266590China College Resources Shandong University of Science and TechnologyTai’an 271019China

The number of traditionally excellent coastal lithologic nuclear power plants is *** is a trend to develop nuclear power plants on soil sites in inland ***,the seismic safety and adaptability of non-rock nuclear power plant(NPP)sites are the key concerns of nuclear safety *** the five site categories are clearly defined in the AP1000 design control documents,the effects of nuclear power five site conditions and soil nonlinearity on the seismic response characteristics of nuclear island buildings have not been systematically considered in previous related *** this study,targeting the AP1000 nuclear island structure as the research object,three-dimensional finite element models of a nuclear island structure at five types of sites(firm rock site(FR),soft rock site(SR),soft-to-medium soil site(SMS),upper bound soft-to-medium site(SMS-UB),and soft soil site(SS))are *** partitioned analysis method of soil-structure interaction(PASSI)in the time-domain is used to investigate the effects of site hardness and nonlinearity on the acceleration,displacement,and acceleration response spectrum of the nuclear island structure under seismic *** incremental equilibrium equation and explicit decoupling method are used to analyze the soil nonlinearity described by the Davidenkov model with simplified loading-reloading *** results show that,in the linear case,with the increase of site hardness,the peak ground acceleration(PGA)and the peak of acceleration response spectrum of the nuclear island structure increase except for the FR site,while the maximum displacement *** nonlinear analysis,as the site hardness increases,the PGA,maximum displacement,and the peak of acceleration response spectrum of the nuclear island structure *** peak value of the acceleration response spectrum in the nonlinear case is greater than that in the linear case for FR,while smaller for SR and soil *** site nonlinear

关键词： partitioned analysis for SSI site conditions nuclear structure explicit-implicit integration scheme incremental algorithm for nonlinear analysis

An enzyme-loaded reactor using metal-organic framework-templated polydopamine microcapsule

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Chinese Journal of Chemical Engineering 2021年第1期34卷 317-325页

作者： Jing Wang Yongqin lv Beijing Key Laboratory of Bioprocess College of Life Science and TechnologyBeijing University of Chemical TechnologyBeijing 100029China

Ultrathin polydopamine microcapsules with hierarchical structure and porosity were prepared for the immobilization of multienzymes using metal-organic framework(MOF) as the *** multienzyme/MOF composite was first prepared using a "one-pot" co-precipitation approach via the coordination and self-assembly of zinc ions and 2-methylimidazole in the presence of *** obtained nanoparticles were then coated with polydopamine thin layer through the self-polymerization of dopamine under alkaline *** polydopamine microcapsules with an ultrathin shell thickness of ~48 nm were finally generated by removing the MOF template at acidic *** enzymes were encapsulated in PDA microcapsules including carbonic anhydrase(CA),formate dehydrogenase(FateDH),and glutamate dehydrogenase(GDH).FateDH that catalyzed the main reaction of CO_(2) reduction to formic acid retained 94.7% activity of equivalent free *** with free multienzymes,the immobilized ones embedded in PDA microcapsules exhibited 4.5-times higher of formate production and high catalytic efficiency with a co-factor-based formate yield of 342%.

关键词： Biocatalysis Enzyme Immobilization Microcapsule Metal-organic framework Template

Rational catalyst design and interface engineering for electrochemical CO_(2) reduction to high-valued alcohols

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Journal of Energy Chemistry 2022年第7期31卷 310-331,I0009页

作者： Lingxi Zhou Ruitao lv State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Advanced Materials(MOE) School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

Electrochemical CO_(2) reduction(eCO_(2)RR) is an emerging strategy to address the global carbon balance issues and fulfill the carbon-neutral goal through converting CO_(2) to value-added chemicals/fuels driven by renewable energy sources. The production of highly reduced carbon compounds beyond CO and formate, especially oxygenate alcohol products with high energy densities and large global market capacities, is particularly desirable for practical applications. However, the building of alcohol-selective e CO_(2)RR electrocatalysis systems to overcome the high overpotential and poor durability remains a big ***, diverse strategies have been developed for rational catalyst design towards alcohol productions from e CO_(2)RR on the basis of the corresponding reaction mechanisms. In this review article, we firstly highlight recent advances in fundamental understanding of mechanisms in three electrochemical CO_(2)-alcohol reaction pathways. Then, the design strategies focused on catalyst and interface design are summarized for building alcohol-selective e CO_(2)RR electrocatalysis systems. The advanced characterization techniques are also discussed to provide more insights into e CO_(2) RR-to-alcohols processes. Finally, the remaining challenges and perspectives for promoting e CO_(2)RR to alcohols are proposed.

关键词： Electrochemical CO_(2)reduction reaction Alcohols Electrocatalysis Selectivity

Classification of Quasifinite Modules with Nonzero Central Charges for EALAs of Type A with Coordinates in Quantum Torus

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Chinese Annals of Mathematics,Series B 2009年第2期30卷 129-138页

作者： Rencai lv Department of Mathematics Suzhou University Suzhou 215006 Jiangsu China

The author first constructs a Lie algebra ∑ ：=∑（q, Wd） from rank 3 quantum torus, which is isomorphic to the core of EALAs of type Ad-1 with coordinates in quantum torus Cqd, and then gives the necessary and sufficient conditions for the highest weight modules to be quasifinite nonzero central charges are Finally the irreducible Z-graded quasifinite ∑-modules with classified.

关键词： Core of EALAs Graded modules Quasifinite module Highest weightmodule Quantum torus

Carleson Measures and Toeplitz Operators on Doubling Fock Spaces

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Chinese Annals of Mathematics,Series B 2019年第3期40卷 349-362页

作者： Xiaofen lv Department of Mathematics Huzhou University

Given φ a subharmonic function on the complex plane C,with ?φdA being a doubling measure,the author studies Fock Carleson measures and some characterizations onμsuch that the induced positive Toeplitz operator T_μ... 详细信息

关键词： Doubling Fock spaces Carleson measure Toeplitz operators