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A SUPERLINEARLY CONVERGENT SPLITTING FEASIBLE SEQUENTIAL QUADRATIC OPTIMIZATION METHOD FOR TWO-BLOCK LARGE-SCALE SMOOTH OPTIMIZATION

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Acta Mathematica Scientia 2023年第1期43卷 1-24页

作者：简金宝张晨刘鹏杰 College of Mathematics and Physics Guangxi Key Laboratory of Hybrid Computation and IC Design AnalysisCenter for Applied Mathematics and Artificial IntelligenceGuangxi Minzu UniversityNanning530006China School of Mechanical Engineering University of Shanghai for Science and TechnologyShanghai200093China School of Mathematics China University of Mining and TechnologyXuzhou221116China

This paper discusses the two-block large-scale nonconvex optimization problem with general linear *** on the ideas of splitting and sequential quadratic optimization(SQO),a new feasible descent method for the discussed problem is ***,we consider the problem of quadratic optimal(QO)approximation associated with the current feasible iteration point,and we split the QO into two small-scale QOs which can be solved in ***,a feasible descent direction for the problem is obtained and a new SQO-type method is proposed,namely,splitting feasible SQO(SF-SQO)***,under suitable conditions,we analyse the global convergence,strong convergence and rate of superlinear convergence of the SF-SQO ***,preliminary numerical experiments regarding the economic dispatch of a power system are carried out,and these show that the SF-SQO method is promising.

关键词： large scale optimization two-block smooth optimization splitting method feasible sequential quadratic optimization method superlinear convergence

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Super-Twisting Control for Re-entry Rigid-Elastic Coupled Hypersonic Vehicles

Super-Twisting Control for Re-entry Rigid-Elastic Coupled Hy...

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2023 China Automation Congress, CAC 2023

作者： Tang, Wentao Fan, Junfang Ji, Yi Li, Yafeng Xu, Xiaobin Zang, Luyao Beijing Information Science and Technology University Beijing Key Laboratory of High Dynamic Navigation Technology Beijing China School of Automation Beijing Information Science and Technology University Beijing China The System Design Institute of Mechan-ical-Electrical Engineering Beijing China

ISBN: (纸本)9798350303759

A super-twisting control strategy is proposed to tackle the complex problem of attitude stabilization control for rigid-elastic coupled hypersonic vehicles experiencing significant aerodynamic perturbations. Initially, the elastic modes are treated as uncertain factors, leading to the construction of a control-oriented dynamic model. To design the attitude subsystem, a combination of a super-twisting algorithm and a non-singular terminal sliding mode is proposed. A first-order differentiator is introduced to address the 'derivative explosion' issue commonly found in traditional control methods, thus eliminating the need for intricate differential computations. Moreover, a switching control strategy is integrated into the nonlinear feedback control law design, ensuring robust velocity tracking. Simulation results validate that the proposed control method surpasses conventional methods in both tracking performance and robustness. © 2023 IEEE.

关键词： Sliding mode control

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Nontoxic chemical crosslinked bacterial cellulose-heparin-gelatin composite hydrogel as antibacterial dressing

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Journal of Materials science & technology 2024年第11期178卷 29-38页

作者： Ruixuan Liu Jingting Cai Nana Qin Kexin Zhang Tongyang Li Hao Luo Dadang Guo State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXi'an 710049China Northwest Institute for Non-ferrous Metal Research Xi'an 710016China College of fashion and art design Xi'an Polytechnic UniversityXi'an 710048China Frontier Institute of Science and Technology Xi'an Jiaotong UniversityXi'an 710049China.

A hydrogel dressing based on bacterial cellulose(BC),which is grafted with quaternary ammonium func-tional and crosslinked with the gelatin-heparin system,is prepared to provide the features mainly con-cerning softness,high swelling ratio,antibacterial property,and *** innovation of prepa-ration is that the BC is beaten into short-chain scaffolds to improve the efficiency of grafting,which not only simplifies the preparation process but also avoids the biotoxicity caused by the introduction of toxic catalyst such as dimethyl sulfoxide(DMSO)or uncertain toxic side products in long-chain *** electron microscopy(SEM)shows that the QBC/Hep/Gel composite hydrogel possesses a three-dimensional mesh structure with high *** hydrogel shows outstanding water manage-ment performance indicated by the swelling ratio of 1476%,water retention ratio of more than 90%at 120 h,and moisture permeability of 3296 g m^(-2) 24 h^(-1).The antibacterial experiment is implemented with staphylococcus aureus,and the antibacterial effect is represented by an inhibition zone of 3 cm in *** vivo animal experiments suggested that QBC/Hep/Gel could effectively promote epithelial reconstruction,collagen deposition,and angiogenesis in normal wounds,reduce inflammation,and ac-celerate wound *** these results indicate that the proposed QBC/Hep/Gel hydrogel is a potential composite for antibacterial dressing.

关键词： Antibacterial dressings Hydrogel dressings Wound healing Cross-linking

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Distributed finite-time event-triggered formation control based on a unified framework of affine image

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IEEE/CAA Journal of Automatica Sinica 2024年第6期12卷 1-3页

作者： Lin, Yan-Jun Yang, Yun-Shi Chai, Li Lin, Zhi-Yun Hangzhou Applied Acoustics Research Institute Hangzhou 310027 China College of Control Science and Engineering Zhejiang University Hangzhou 310027 China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen 518055 and also with Peng Cheng Laboratory Shenzhen 518000 China

Dear Editor, This letter concentrates on distributed event-triggered formation control problems with finite-time convergence in an arbitrarily dimensional Euclidean space. A new unified approach of finite-time event-triggered formation control is proposed by steering all agents to a sliding manifold (the affine image) to achieve general formations, like affine, rigid or translational formation. It only requires to design an extra steering law driving at least d +1 leaders from an affine image to a rigid or translational image, where d is the dimension of the space. The event-triggered function is designed in a distributed and discontinuous manner based only on local information to reduce the communication and calculation resources by aperiodic sampling. In the proposed event-triggered formation law, zeno-free behavior is ensured. IEEE

关键词： Sliding mode control

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Trilogy of drug repurposing for developing cancer and chemotherapy-induced heart failure co-therapy agent

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Acta Pharmaceutica Sinica B 2024年第2期14卷 729-750页

作者： Xin Chen Xianggang Mu Lele Ding Xi Wang Fei Mao Jinlian Wei Qian Liu Yixiang Xu Shuaishuai Ni Lijun Jia Jian Li State Key Laboratory of Bioreactor Engineering Shanghai Frontiers Science Center of Optogenetic Techniques for Cell MetabolismFrontiers Science Center for Materiobiology and Dynamic ChemistryShanghai Key Laboratory of New Drug DesignSchool of PharmacyEast China University of Science and TechnologyShanghai 200237China Cancer Institute Longhua HospitalShanghai University of Traditional Chinese MedicineShanghai 200032China College of Pharmacy Jinan UniversityGuangzhou 510632China

Chemotherapy-induced complications,particularly lethal cardiovascular diseases,pose significant challenges for cancer *** intertwined adverse effects,brought by cancer and its complication,further complicate anticancer therapy and lead to diminished clinical *** supplementation of cardioprotective agents falls short in addressing these *** bifunctional co-therapy agents provided another potential solution to consolidate the chemotherapy and reduce cardiac events *** repurposing was naturally endowed with co-therapeutic potential of two indications,implying a unique chance in the development of bi-functional ***,we further proposed a novel“trilogy of drug repurposing”strategy that comprises function-based,targetfocused,and scaffold-driven repurposing approaches,aiming to systematically elucidate the advantages of repurposed drugs in rationally developing bi-functional *** function-based repurposing,a cardioprotective agent,carvedilol(CAR),was identified as a potential neddylation inhibitor to suppress lung cancer *** target-focused SAR studies and scaffold-driven drug design,we synthesized 44 CAR derivatives to achieve a balance between anticancer and ***,optimal derivative 43 displayed promising bi-functional effects,especially in various self-established heart failure mice models with and without ***,the present study validated the practicability of the“trilogy of drug repurposing”strategy in the development of bi-functional cotherapy agents.

关键词： Anticancer Heartfailure Complication Drug repurposing Bi-functional drug

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Experimental Investigation on Natural Circulation Characteristics of Core Make-Up Tank Under Rolling Conditions 29

Experimental Investigation on Natural Circulation Characteri...

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2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Wang, Shuguang Zhang, Jinlei Shen, Ya'ou Liu, Xiaobo Ding, Shuhua Liu, Yusheng Li, Dongyang Tang, Jilin Heilongjiang Provincial Key Laboratory of Nuclear Power System & Equipment Harbin Engineering University Harbin China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China Nuclear and Radiation Safety Center Beijing China

ISBN: (纸本)9780791886502

In the floating nuclear power plant, Core Make-up Tank (CMT) is one of the passive safety facilities, has been widely used in nuclear engineering. Under emergency conditions, natural circulation occurs and consequent thermal stratification appears in CMT system. However, rolling motion will directly affect the natural circulation and destroy the formation of thermal stratification, so there will be uncertain and unknown change of the safety injection capacity of CMT. Based on above analysis, this work carried out experiments under rolling conditions to reveal natural circulation and thermal stratification characteristics in CMT. A temperature detecting matrix formed by thermocouples is deployed in CMT. It is concluded that thermal stratification distribution is affected by the rolling conditions. Rolling conditions increase the thickness of thermal stratification and reduce the temperature gradient. The CMT natural circulation has two stages, the influence of rolling motion on the average flow in the first stage of natural circulation is very weak, but rolling motion will significantly affect the second stage of natural circulation and advance the decline time of direct vessel injection (DVI) flow rate. The transition time of natural circulation stage and the flow change in the second stage of natural circulation are related to the thermal stratification in CMT. The impact of rolling conditions should not be ignored when evaluating the performance of CMT. © 2022 by ASME.

关键词： Safety engineering

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Principle and Control of Active Engine Mount Based on Magnetostrictive Actuator

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Chinese Journal of Mechanical Engineering 2022年第6期35卷 363-376页

作者： Zhiyuan Si Xianxu‘Frank’Bai Lijun Qian Peng Chen Laboratory for Adaptive Structures and Intelligent Systems(LASIS) Department of Vehicle EngineeringHefei University of TechnologyHefei 230009China School of Mechanical Engineering Anhui Science and Technology UniversityFengyang 233100China Guangzhou Automobile Research and Design Center Guangzhou 511434China

Engine mount system affects the automobile NVH *** mounts would achieve excellent vibration isolation and relative displacement control performance in a broad frequency bandwidth by outputting controlled force to the mounting *** actuator and control method of the active mounts determine the system *** this paper,an active mount based on the smart material,i.e.,Terfenol-D rod,is proposed,which mainly includes three parts:rubber spring,magnetostrictive actuator(MA),and hydraulic amplification mechanism(HAM).Dynamic model of the active mount is correspondingly established.A state feedback control method based on x-LMS(Least-Mean-Square)algorithm is proposed as ***,with the consideration of the unmeasurable state parameters in the active mounting system,an x-LMS state feedback controller with the system state as the reference signal is constructed by employing Sage-Husa Kalman filter to realize the state estimation of the active mounting *** a detailed analysis of the proposed control method is conducted,with deriving iterative formula of tap-weight ***,the problem of the dependence on the excitation signal in the x-LMS algorithm is *** feasibility and capability of the proposed control method are verified and evaluated by simulation of a two-degree-offreedom active mounting system.

关键词： Terfenol-D rod x-LMS Sage-Husa Kalman filter Semi-active control Active mount controller

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Recent progress in heterostructured materials for room-temperature sodium-sulfur batteries

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Interdisciplinary Materials 2024年第4期3卷 565-594页

作者： Haobin Song Yifan Li Xue LLi Yixiang Li Dong-sheng Li Deli Wang Shaozhuan Huang Hui Ying Yang Pillar of Engineering Product Development Singapore University of Technology and DesignSingaporeSingapore Key Laboratory of Inorganic Nonmetallic Crystalline and Energy Conversion Materials College of Materials and Chemical EngineeringChina Three Gorges UniversityYichangChina Key Laboratory of Material Chemistry for Energy Conversion and Storage Ministry of EducationHubei Key Laboratory of Material Chemistry and Service FailureSchool of Chemistry and Chemical EngineeringHuazhong University of Science and TechnologyWuhanChina Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science South-Central Minzu UniversityWuhanChina

Room-temperature sodium-sulfur(RT Na-S)batteries are a promising next-generation energy storage device due to their low cost,high energy density(1274 Wh kg^(-1)),and environmental ***,RT Na-S batteries face a series of vital challenges from sulfur cathode and sodium anode:(i)sluggish reaction kinetics of S and Na_(2)S/Na_(2)S_(2);(ii)severe shuttle effect from the dissolved intermediate sodium polysulfides(NaPSs);(iii)huge volume expansion induced by the change from S to Na_(2)S;(iv)continuous growth of sodium metal dendrites,leading to short-circuiting of the battery;(v)huge volume expansion/contraction of sodium anode upon sodium plating/stripping,causing uncontrollable solid-state electrolyte interphase growth and“dead sodium”*** strategies have been proposed to address these issues,including physical/chemical adsorption of NaPSs,catalysts to facilitate the rapid conversion of NaPSs,high-conductive materials to promote ion/electron transfer,good sodiophilic Na anode hetero-interface homogenized Na ions flux and three-dimensional porous anode host to buffer the volume expansion of *** materials can combine these merits into one material to realize ***,the recent development of heterostructure as the host for sulfur cathode and Na anode has been *** of all,the electrochemical mechanisms of sulfur cathode/sodium anode and principles of heterostructures reinforced Na-S batteries are ***,the application of heterostructures in Na-S batteries is comprehensively ***,the current primary avenues of employing heterostructures in Na-S batteries are *** and prospects are put forward regarding the existing problems in current research,aiming to inspire the design of advanced and improved next-generation Na-S batteries.

关键词： heterostructured materials polysulfides shuttle effect sodiophilic Na anode sodium sulfur

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High-dimensional aerodynamic data modeling using a machine learning method based on a convolutional neural network

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Advances in Aerodynamics 2022年第1期4卷 845-875页

作者： Bo-Wen Zan Zhong-Hua Han Chen-Zhou Xu Ming-Qi Liu Wen-Zheng Wang Institute of Aerodynamic and Multidisciplinary Design Optimization National Key Laboratory of Science and Technology On Aerodynamic Design and ResearchSchool of AeronauticsNorthwestern Polytechnical UniversityXi’an710072China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province School of Aeronautics and AstronauticsUniversity of Electronic Science and Technology of ChinaChengdu611731China

Modeling high-dimensional aerodynamic data presents a significant challenge in aero-loads prediction, aerodynamic shape optimization, flight control, and simulation. This article develops a machine learning approach based on a convolutional neural network (CNN) to address this problem. A CNN can implicitly distill features underlying the data. The number of parameters to be trained can be significantly reduced because of its local connectivity and parameter-sharing properties, which is favorable for solving high-dimensional problems in which the training cost can be prohibitive. A hypersonic wing similar to the Sanger aerospace plane carrier wing is employed as the test case to demonstrate the CNN-based modeling method. First, the wing is parameterized by the free-form deformation method, and 109 variables incorporating flight status and aerodynamic shape variables are defined as model input. Second, more than 7000 sample points generated by the Latin hypercube sampling method are evaluated by performing computational fluid dynamics simulations using a Reynolds-averaged Navier-Stokes flow solver to obtain an aerodynamic database, and a CNN model is built based on the observed data. Finally, the well-trained CNN model considering both flight status and shape variables is applied to aerodynamic shape optimization to demonstrate its capability to achieve fast optimization at multiple flight statuses.

关键词： Aerodynamic data modeling High-dimensional problem Machine learning Convolutional neural network Computational fluid dynamics

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The Influence of Suspension and Deposition on Pool Boiling Heat Transfer of Nanofluids: Experiment and Engineering Model Study

SSRN

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SSRN 2024年

作者： Peng, Cheng Song, Youya Deng, Jian Wu, Jiang Chen, Helin Liu, Fang College of Energy and Mechanical Engineering Shanghai University of Electric Power Shanghai China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

Applications including heat exchangers, high power electronic components, and nuclear reactors now require heat transfer technologies that can achieve both high efficiency and compact footprints. Because nanofluids have advantageous heat transfer properties, they have a greater potential to replace conventional coolants. However, predicting nanofluid boiling heat transfer is still difficult. In order to compare the coupled effects of suspended and deposited nanoparticles with the single effect of deposited nanoparticles, the researchers conducted boiling heat transfer experiments. The findings demonstrated that suspended nanoparticles made the surface less wettable, while the deposited nanoparticles increased the wettability. The number of active nucleate sites and the frequency of bubble detachment increase due to the suspension and deposition of nanoparticles, whereas the diameter of the bubble decreases. Based on the experimental data, predictive models for boiling heat transfer and bubble behavior were proposed, with a range of mass concentrations from 0.001% to 0.005% and heat flux between 60 and 130 kW/m2. Less than 30% was found to be the error margin between the experimental data and the predictive equations. It was discovered that the influence of deposited nanoparticles on boiling heat transfer was usually dominant, according to the predictions made by the proposed theoretical models. © 2024, The Authors. All rights reserved.

关键词： Deposition

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