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Science China(Information Sciences) 2025年第1期68卷 292-305页

作者： Tao shi Wei-Wei CHE School of Mechatronic Engineering and Automation Shanghai University State Key Laboratory of Synthetical Automation for Process Industries Northeastern University College of Information Science and Engineering Northeastern University

This article proposes a distributed dynamic event-triggered data-driven iterative learning control(DET-DDILC)scheme under a predefined performance to tackle the bipartite tracking control problem for multiagent systems(MASs). An improved dynamic linearization technique is utilized to convert the nonlinear MASs into an iterative linear data model. First,a peer-to-peer mapping function is introduced to map the constrained distributed system output homeomorphism to an unconstrained one. In addition, a DET mechanism based on a time-iteration-varying function is devised to conserve network communication resources. Based on the unconstrained transformation and the designed DET mechanism, the DET-DDILC algorithm is devised to ensure that the bipartite tracking performance of MASs can be within the preset range. Finally, the effectiveness and feasibility of the designed control scheme are demonstrated via a simulation case by a comparison.

关键词： bipartite tracking control prescribed performance event-triggered iterative learning control multiagent systems

Penalty Function-Based Distributed Primal-Dual Algorithm for Nonconvex Optimization Problem

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IEEE/CAA Journal of Automatica Sinica 2025年第2期12卷 394-402页

作者： Xiasheng shi Changyin Sun IEEE the Engineering Research Center of Autonomous Unmanned System Technology Ministry of Education Anhui University the School of Artificial Intelligence Anhui University Anhui Provincial Engineering Research Center for Unmanned System and Intelligent Technology Anhui University the Anhui Key Laboratory Industrial Energy-Saving and Safety Anhui University

This paper addresses the distributed nonconvex optimization problem, where both the global cost function and local inequality constraint function are nonconvex. To tackle this issue, the p-power transformation and penalty function techniques are introduced to reframe the nonconvex optimization problem. This ensures that the Hessian matrix of the augmented Lagrangian function becomes local positive definite by choosing appropriate control parameters. A multi-timescale primal-dual method is then devised based on the Karush-Kuhn-Tucker(KKT) point of the reformulated nonconvex problem to attain convergence. The Lyapunov theory guarantees the model's stability in the presence of an undirected and connected communication network. Finally, two nonconvex optimization problems are presented to demonstrate the efficacy of the previously developed method.

关键词： Constrained optimization Karush-Kuhn-Tucker (KKT) point nonconvex p-power transformation

Experimental confirmation of the linear relation between plasma current and external vertical magnetic field in EXL-50 spherical torus energetic electron plasmas

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Plasma Science and Technology 2024年第8期26卷 32-36页

作者：董力立王明远刘文军石跃江董家齐郭栋孙恬恬顾翔宋显明袁保山彭元凯 the ENN Team Hebei Key Laboratory of Compact Fusion Langfang 065001People’s Republic of China School of Mathematics and Physics Anqing Normal UniversityAnqing 246133People’s Republic of China ENN Science and Technology Development Co.Ltd. Langfang 065001People’s Republic of China

A three-fluid equilibrium plasma with bulk plasma and energetic electrons has been observed on the Xuanlong-50(EXL-50) spherical torus, where the energetic electrons play a crucial role in sustaining the plasma current and pressure. In this study, the equilibrium of a multi-fluid plasma was investigated by analyzing the relationship between the external vertical magnetic field(B_(V)),plasma current(I_(p)), the poloidal ratio(β_(p)) and the Shafranov formula. Remarkably, our research demonstrates some validity of the Shafranov formula in the presence of multi-fluid plasma in EXL-50 spherical torus. This finding holds significant importance for future reactors as it allows for differentiation between alpha particles and background plasma. The study of multi-fluid plasma provides a significant reference value for the equilibrium reconstruction of burning plasma involving alpha particles.

关键词： plasma equilibrium Shafranov formula multi-fluid plasma

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Joint Feature Encoding and Task Alignment Mechanism for Emotion-Cause Pair Extraction

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Computers, Materials & Continua 2025年第1期82卷 1069-1086页

作者： shi Li Didi Sun College of Computer and Control Engineering Northeast Forestry UniversityHarbin150040China

With the rapid expansion of social media,analyzing emotions and their causes in texts has gained significant ***-cause pair extraction enables the identification of causal relationships between emotions and their triggers within a text,facilitating a deeper understanding of expressed sentiments and their underlying *** comprehension is crucial for making informed strategic decisions in various business and societal ***,recent research approaches employing multi-task learning frameworks for modeling often face challenges such as the inability to simultaneouslymodel extracted features and their interactions,or inconsistencies in label prediction between emotion-cause pair extraction and independent assistant tasks like emotion and cause *** address these issues,this study proposes an emotion-cause pair extraction methodology that incorporates joint feature encoding and task alignment *** model consists of two primary components:First,joint feature encoding simultaneously generates features for emotion-cause pairs and clauses,enhancing feature interactions between emotion clauses,cause clauses,and emotion-cause ***,the task alignment technique is applied to reduce the labeling distance between emotion-cause pair extraction and the two assistant tasks,capturing deep semantic information interactions among *** proposed method is evaluated on a Chinese benchmark corpus using 10-fold cross-validation,assessing key performance metrics such as precision,recall,and F1 *** results demonstrate that the model achieves an F1 score of 76.05%,surpassing the state-of-the-art by 1.03%.The proposed model exhibits significant improvements in emotion-cause pair extraction(ECPE)and cause extraction(CE)compared to existing methods,validating its *** research introduces a novel approach based on joint feature encoding and task alignment mechanisms,contributing to advancements in emotion-c

关键词： Emotion-cause pair extraction interactive information enhancement joint feature encoding label consistency task alignment mechanisms

Detection and Recognition of Spray Code Numbers on Can Surfaces Based on OCR

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Computers, Materials & Continua 2025年第1期82卷 1109-1128页

作者： Hailong Wang Junchao shi School of Computer Science Zhongyuan University of TechnologyZhengzhou450007China

A two-stage algorithm based on deep learning for the detection and recognition of can bottom spray codes and numbers is proposed to address the problems of small character areas and fast production line speeds in can bottom spray code number *** the coding number detection stage,Differentiable Binarization Network is used as the backbone network,combined with the Attention and Dilation Convolutions Path Aggregation Network feature fusion structure to enhance the model detection *** terms of text recognition,using the Scene Visual Text Recognition coding number recognition network for end-to-end training can alleviate the problem of coding recognition errors caused by image color distortion due to variations in lighting and background *** addition,model pruning and quantization are used to reduce the number ofmodel parameters to meet deployment requirements in resource-constrained environments.A comparative experiment was conducted using the dataset of tank bottom spray code numbers collected on-site,and a transfer experiment was conducted using the dataset of packaging box production *** experimental results show that the algorithm proposed in this study can effectively locate the coding of cans at different positions on the roller conveyor,and can accurately identify the coding numbers at high production line *** Hmean value of the coding number detection is 97.32%,and the accuracy of the coding number recognition is 98.21%.This verifies that the algorithm proposed in this paper has high accuracy in coding number detection and recognition.

关键词： Can coding recognition differentiable binarization network scene visual text recognition model pruning and quantification transport model

A Novel Control Strategy Based onπ-VSG for Inter-Face Converter in Hybrid Microgrid

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Energy Engineering 2025年第2期122卷 471-492页

作者： Kai shi Dongyang Yang Department of Electrical Engineering Jiangsu UniversityZhenjiang21200China

The rapid development of new energy power generation technology and the transformation of power electronics in the core equipment of source-grid-load drives the power system towards the“double-high”development pattern of“high proportion of renewable energy”and“high proportion of power electronic equipment”.To enhance the transient performance of AC/DC hybrid microgrid(HMG)in the context of“double-high,”aπtype virtual synchronous generator(π-VSG)control strategy is applied to bidirectional interface converter(BIC)to address the issues of lacking inertia and poor disturbance immunity caused by the high penetration rate of power electronic equipment and new ***,the virtual synchronous generator mechanical motion equations and virtual capacitance equations are used to introduce the virtual inertia control equations that consider the transient performance of HMG;based on the equations,theπ-type equivalent control model of the BIC is ***,the inertia power is actively transferred through the BIC according to the load fluctuation to compensate for the system’s inertia ***,theπ-VSG control utilizes small-signal analysis to investigate howthe fundamental parameters affect the overall stability of the HMG and incorporates power step response curves to reveal the relationship between the control’s virtual parameters and transient ***,the PSCAD/EMTDC simulation results show that theπ-VSG control effectively improves the immunity of AC frequency and DC voltage in the HMG system under the load fluctuation condition,increases the stability of the HMG system and satisfies the power-sharing control objective between the AC and DC subgrids.

关键词： Hybrid AC/DC microgrid electromotive force of DC motor interface converter virtual synchronous generator control

The shadow and gamma-ray bursts of a Schwarzschild black hole in asymptotic safety

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Communications in Theoretical Physics 2025年第2期77卷 121-131页

作者： Yuxuan shi Hongbo Cheng Department of Physics East China University of Science and Technology The Shanghai Key Laboratory of Astrophysics

The effects and rules of the dimensionless parameter ξ on neutrino annihilation v+■→e-+e+dominated gamma-ray bursts are analysed and investigated within the context of black holes in asymptotic *** also computationally model photon orbits around black holes,as photons and neutrinos have the same geodesic equations near black *** show that the black hole shadow radius decreases with increasing ξ.Calculations are made to determine the temperature of the accretion disk surrounding the black hole and the ratio ■Newtof energy deposition per unit time and compared to that of the Newtonian *** accretion disk temperature peaks at a higher temperature due to quantum gravity corrections,which increases the probability of neutrino emission from the black *** is interesting to note that larger quantum gravity effects cause the ratio value to significantly *** the neutrinoantineutrino annihilation process,the energy deposition rate is sufficient even while the energy conversion is inhibited because of quantum ***-ray bursts might originate from the corrected annihilation ***,we examine the derivative d■/dr about the star radius *** findings demonstrate that the ratio is lowered by the black hole's quantum *** neutrino pair annihilation grows weaker the more prominent the influence of quantum gravity.

关键词： quantum gravity black hole gamma-ray burst

Multi-Objective optimization for stable and efficient cargo transportation of partial space elevator

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Defence Technology(防务技术) 2025年第2期44卷 17-29页

作者： Gefei shi Zheng H.Zhu School of Aeronautics and Astronautics Sun Yat-sen UniversityGuangzhou 510275China Shenzhen Key Laboratory of Intelligent Microsatellite Constellation Shenzhen 518107China Department of Mechanical Engineering York University4700 Keele StreetTorontoCanada

This paper proposed a new libration decoupling analytical speed function(LD-ASF)in lieu of the classic analytical speed function to control the climber's speed along a partial space elevator to improve libration stability in cargo *** LD-ASF is further optimized for payload transportation efficiency by a novel coordinate game theory to balance competing control objectives among payload transport speed,stable end body's libration,and overall control input via model predictive *** transfer period is divided into several sections to reduce computational *** validity and efficacy of the proposed LD-ASF and coordinate game-based model predictive control are demonstrated by computer *** results reveal that the optimized LD-ASF results in higher transportation speed,stable end body's libration,lower thrust fuel consumption,and more flexible optimization space than the classic analytical speed function.

关键词： Partial space elevator Stable transportation Libration decoupling analytical speed function Coordinate game Model predictive control Pareto optimization

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Engineering strategies of biomaterial-assisted exosomes for skin wound repair:Latest advances and challenges

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Chinese Chemical Letters 2025年第1期36卷 99-109页

作者： Yang Xu Le Ma Yang Wang Chunmeng shi Institute of Rocket Force Medicine State Key Laboratory of Trauma and Chemical PoisoningThird Military Medical University(Army Medical University)Chongqing 400038China

The treatment of skin wounds,especially chronic wounds,remains a critical clinical challenge and places a heavy burden on patients and healthcare *** recent years,the engineering strategy of using biomaterial-assisted exosomes has emerged as a powerful tool for skin *** to treatments such as debridement and regular dressing changes,the design of biomaterial-assisted exosomes not only maintains the bioactivity of exosomes at the wound site but also provides an appropriate microenvironment for the repair of complex tissues,thereby accelerating wound *** review systematically introduces the general characteristics of exosomes and their functions in skin wound healing,highlights recent advances in classification of natural exosomes and engineering methods which enriching their functions in intercellular ***,various emerging and innovative approaches based on biomaterials delivery of exosomes are comprehensively *** review seeks to bring an in-depth understanding of bioactive dressings based on exosomes therapeutic strategies,aiming to facilitate new clinical application value.

关键词： Exosomes Biomaterials Hydrogel Delivery system Wound healing

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Emission characteristics and probabilistic health risk of volatile organic compounds from leather sofa

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Journal of Environmental Sciences 2025年第2期148卷 79-87页

作者： Chuanhui Mu Yuling Tang Zhaohui Yang Jianfei Zhou Bi shi National Engineering Laboratory for Clean Technology of Leather Manufacture Sichuan UniversityChengdu 610065China Research Institute of Leather and Footwear Industry of Wenzhou Wenzhou 325088China Key Laboratory of Leather Chemistry and Engineering of Ministry of Education Sichuan UniversityChengdu 610065China

Furniture is identified as a vital volatile organic compound(VOC)emission source in the indoor *** has become the most common raw and auxiliary fabric material for upholstered furniture,particularly with extensive consumption in sofas,due to its abundant resources and efficient *** being widely traded across the world,little research has been conducted on the VOCs released by leathermaterials and their health risk assessment in the indoor ***,this study investigated the VOC emissions of leather with different grades and the health risk of the inhalation *** on the ultra-fast gas phase electronic nose(EN)and GC-FID/Qtof,the substantial emissions of aliphatic aldehyde ketones(Aks),particularly hexanal,appear to be the cause of off-flavor in medium and low grade(MG and LG)sofa *** health risk assessment indicated that leather materials barely pose non-carcinogenic and carcinogenic effects to *** the abundance of VOC sources and the accumulation of health risks in the indoor environment,more stringent specifications concerning qualitative and quantitative content should be extended to provide VOC treatment basic for the manufacturing industry and obtain better indoor air quality.

关键词： Indoor environment Leather Volatile organic compounds(VOCs) Health risk assessment