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IEEE/CAA Journal of Automatica Sinica 2022年第3期9卷 520-532页

作者： Lina xia qing Li Ruizhuo Song Hamidreza Modares Beijing Engineering Research Center of Industrial Spectrum Imaging School of Automation and Electrical EngineeringUniversity of Science and Technology Beijing IEEE the Department of Mechanical Engineering Michigan State University

The asymmetric input-constrained optimal synchronization problem of heterogeneous unknown nonlinear multiagent systems(MASs)is considered in the ***,a state-space transformation is performed such that satisfaction of symmetric input constraints for the transformed system guarantees satisfaction of asymmetric input constraints for the original ***,considering that the leader’s information is not available to every follower,a novel distributed observer is designed to estimate the leader’s state using only exchange of information among neighboring *** that,a network of augmented systems is constructed by combining observers and followers dynamics.A nonquadratic cost function is then leveraged for each augmented system(agent)for which its optimization satisfies input constraints and its corresponding constrained Hamilton-Jacobi-Bellman(HJB)equation is solved in a data-based *** specifically,a data-based off-policy reinforcement learning(RL)algorithm is presented to learn the solution to the constrained HJB equation without requiring the complete knowledge of the agents’*** of the improved RL algorithm to the solution to the constrained HJB equation is also ***,the correctness and validity of the theoretical results are demonstrated by a simulation example.

关键词： Asymmetric input-constrained heterogeneousnonlinear multiagent systems(MASs) Hamilton-Jacobi-Bellman(HJB)equation novel observer reinforcement learning(RL)

Bond-associated non-ordinary state-based peridynamic model for multiple spalling simulation of concrete

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Acta Mechanica Sinica 2021年第7期37卷 1104-1135,I0002页

作者： Siyang Yang Xin Gu qing Zhang xiaozhou xia Department of Engineering Mechanics College of Mechanics and MaterialsHohai UniversityNanjing 211100China

The non-ordinary state-based peridynamic(NOSB PD)model has the capability of incorporating existing constitutive relationships in the classical continuum *** the present work,we first develop an NOSB PD model corresponding to the Johnson–Holmquist II(JH-2)constitutive damage model,which can describe the severe damage of concrete under intense impact ***,the numerical oscillation problem of the NOSB PD caused by zero-energy mode is analyzed and hence a bond-associated non-ordinary state-based peridynamic(BA-NOSB PD)model is adopted to remove the ***,the elastic deformation of a three-dimensional bar is analyzed to verify the capability of BA-NOSB PD in eliminating the numerical ***,concrete spalling caused by the interaction of incident compression wave and reflected tension wave is *** dynamic tensile fracture process of concrete multiple spalling is accurately reproduced for several examples according to the spalling number and spalling thickness analysis,illustrating the approach can well simulate and analyze the concrete spalling discontinuities.

关键词： Non-ordinary state-based peridynamics Bond-associated horizon-Johnson-HolmquistⅡ(JH-2)model Wave propagation Multiple spalling

Sodium cellulose sulfate: A promising biomaterial used for microcarriers' designing

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Frontiers of Chemical Science and Engineering 2019年第1期13卷 46-58页

作者： qing-Xi Wu Yi-Xin guan Shan-Jing Yao Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China School of Life Sciences Anhui UniversityAnhui Key Laboratory of Modem BiomanufacturingKey Laboratory of Eco-engineering and Biotechnology of Anhui ProvinceHefei 230601China

Due to a worldwide focus on sustainable materials for human health and economy services, more and more natural renewable biomass are regarded as promising materials that could replace synthetic polymers and reduce global dependence on petroleum resources. Cellulose is known as the most abundant renewable polymer in nature, varieties of cellulose-based products have been developed and have gained growing interest in recent years. In this review, a kind of water-soluble cellulose derivative, i.e., sodium cellulose sulfate (NaCS) is introduced. Details about NaCS's physicochemical properties like solubility, biocompatibility, biodegradability, degree of substitution, etc. are systematically elaborated. And promising applications of NaCS used as biomaterials for microcarriers' designing, such as microcell- carriers, micro-drug-carriers, etc., are presented.

关键词： sodium cellulose sulfate biomaterial physicochemical properties microcarriers

Enabling Mg metal anodes rechargeable in conventional electrolytes by fast ionic transport interphase

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National Science Review 2020年第2期7卷 333-341页

作者： Ruijing Lv Xuze guan Jiahua Zhang Yongyao xia Jiayan Luo Key Laboratory for Green Chemical Technology of Ministry of Education State Key Laboratory of Chemical Engineering School of Chemical Engineering and Technology Tianjin University Department of Chemistry Fudan University

Rechargeable magnesium batteries have received extensive attention as the Mg anodes possess twice the volumetric capacity of their lithium counterparts and are dendrite-free. However, Mg anodes suffer from surface passivation film in most glyme-based conventional electrolytes, leading to irreversible plating/stripping behavior of Mg. Here we report a facile and safe method to obtain a modified Mg metal anode with a Sn-based artificial layer via ion-exchange and alloying reactions. In the artificial coating layer, Mg2Sn alloy composites offer a channel for fast ion transport and insulating MgCl2/SnCl2bestows the necessary potential gradient to prevent deposition on the surface. Significant improved ion conductivity of the solid electrolyte interfaces and decreased overpotential of Mg symmetric cells in Mg(TFSI)2/DME electrolyte are obtained. The coated Mg anodes can sustain a stable plating/stripping process over 4000 cycles at a high current density of 6 mA cm-2. This finding provides an avenue to facilitate fast ion diffusion kinetics of Mg metal anodes in conventional electrolytes.

关键词： fast ion transport interphase artificial layer Mg metal anodes conventional electrolytes

Nitrogen-,phosphorus-doped carbon-carbon nanotube CoP dodecahedra by controlling zinc content for high-performance electrocatalytic oxygen evolution

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Rare Metals 2020年第6期39卷 680-687页

作者： xia-xia Li Pei-Yao Zhu qing Li Yu-xia Xu Yan Zhao Huan Pang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China guangling College Yangzhou UniversityYangzhou 225000China College of Chemistry and Materials Science Sichuan Normal UniversityChengdu 610068China

Here,N-and P-doped carbon-carbon nanotube CoP(NPC-CNTs-CoP)nanoparticles dodecahedra are achieved by multistep calcination of the Zn-doped zeolitic imidazolate framework ZIF-67 precursor(ZnCo-ZIF).In the structures,the presence of N and P atoms,abundant CNTs and the CoP nanoparticles can enhance electrochemical activity and promote the structural stability of *** the temperature increases,the Zn contents gradually reduce to zero,which provides more active sites for electrochemical ***,the high specific surface area and microporous behavior of NPC-CNTsCoP-9 make it excellent in electrocatalytic ***-CoP-9 shows a low overpotential of 224 mV at10 mA·cm^-2 in 1.0 mol·L^-1 KOH *** strategy of zeolitic imidazole framework-derived transition metal phosphides will provide a new sight for developing energy conversion materials.

关键词： Nitrogen Phosphorus Carbon Carbon nanotube CoP Oxygen evolution

The Characterization of Graphs with No 2-connected Spanning Subgraph of V_(8)as a Minor

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Acta Mathematicae Applicatae Sinica 2022年第4期38卷 902-915页

作者： xiao-min ZHOU xia-xia guan Cheng-fu QIN Wei-hua YANG Department of Mathematics Taiyuan University of TechnologyTaiyuan 030000China School of Mathematical Sciences Xiamen UniversityXiamen 361005China School of Mathematics Science Guangxi Teachers Education UniversityNanning 530001China

It is difficult to characterize graphs which contain no a 2-connected graph as a minor in graph *** V_(8)be a graph constructed from an 8-cycle by connecting the antipodal *** are thirteen 2-connected spanning subgraphs of V_(8).In particular,one of them is obtained from the Petersen graph by deleting two vertices and it is also a hard problem to characterize Petersen-minor-free *** this paper,we characterize internally 4-connected graphs which contain a 2-connected spanning subgraph of V_(8)as a forbidden minor.

关键词： V_(8) internally 4-connected graph minor-free 2-connected subgraph

Dense copper azide synthesized by in-situ reaction of assembled nanoporous copper microspheres and its initiation performance

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Defence Technology（防务技术） 2022年第6期18卷 1065-1072页

作者： Xing-yu Wu Ming-yu Li qing-xuan Zeng qing-xia Yu State Key Laboratory of Explosion and Technology Beijing Institute of TechnologyBeijing100081PR China

Copper azide with high density was successfully synthesized by in-situ reaction of nanoporous copper(NPC)precursor with HN_(3) *** with pore size of about 529 nm has been prepared by electroless plating using polystyrene(PS)as *** copper shells thickness of NPC was controlled by adjusting the PS loading *** effects of copper shell on the morphology,structure and density of copper azide were *** conversion increased from 87.12%to 95.31%when copper shell thickness decrease from 100 to 50 ***,the density of copper azide prepared by 529 nm NPC for 24 h was up to 2.38 g/cm^(3).The hollow structure of this NPC was filled by swelling of copper azide which guaranteed enough filling volume for keeping the same shape as well as improving the charge ***,HNS-IV explosive was successfully initiated by copper azide with minimum charge thickness of 0.55 mm,showing that copper azide prepared has excellent initiation performance,which has more advantages in the application of miniaturized explosive systems.

关键词： Nanoporous copper Electroless plating In-situ reaction Copper azide

Puncture injection of para-toluenesulfonamide combined with chemoembolization for advanced hepatocellular carcinoma

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World Journal of Gastroenterology 2012年第46期18卷 6861-6864页

作者： qing He An-Ren Kuang Yong-Song guan Yue-qing Liu Department of Oncology West China Hospital of Sichuan University Department of Nuclear Medicine West China Hospital of Sichuan University

Hepatocellular carcinoma (HCC) is difficult to eradicate due to its resilient nature. Portal vein is often involved in tumors of large size, which exclude the patient from surgical resection and local ablative therapy, such as percutaneous ethanol injection (PEI) and radiofrequency ablation (RFA) because they were considered neither effective nor safe. Currently, there is almost no effective treatment for HCC of such condition. As a unique antitumor agent in form of lipophilic fluid for local injection, para-toluenesulfonamide (PTS) produces mild side effects while necrotizing the tumor tissues quickly and efficiently. Being largely different from both PEI and RFA therapies, PTS can disseminate itself in tumors more easily than other caustic agents, such as alcohol. So PTS may offer additional benefit to HCCs with vascular involvement. We herein describe a 70-year-old HCC patient who was treated with the combination of PTS injection and transcatheter arterial chemoembolization, resulting in a significantly improved clinical prognosis.

关键词： Hepatocellular carcinoma Para-toluenesulfonamide Antitumor agent Transcatheter arterial chemoembolization Therapy

How to make insulin-producing pancreatic β cells for diabetes treatment

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Science China(Life Sciences) 2017年第3期60卷 239-248页

作者： Jiaqi Lu qing xia Qiao Zhou State Key Laboratory of Natural and Biomimetic Drugs Department of Chemical BiologyPeking University School of Pharmaceutical Sciences Department of Stem Cell and Regenerative Biology Harvard Stem Cell InstituteHarvard University

Around 400 million people worldwide suffer from diabetes *** major pathological event for Type 1 diabetes and advanced Type 2 diabetes is loss or impairment of insulin-secreting β cells of the *** the past 100 years,daily insulin injection has served as a life-saving treatment for these ***,insulin injection often cannot achieve full glucose control,and over time poor glucose control leads to severe complications and *** an alternative treatment,islet transplantation has been demonstrated to effectively maintain glucose homeostasis in diabetic patients,but its wide application is limited by the scarcity of donated ***,it is important to define new strategies to obtain functional human β cells for transplantation ***,we summarize recent progress towards the production of β cells in vitro from pluripotent stem cells or somatic cell types including a cells,pancreatic exocrine cells,gastrointestinal stem cells,fibroblasts and *** also discuss novel methods for optimizing β cell transplantation and maintenance in *** our perspective,the future of βcell replacement therapy is very promising although it is still challenging to control differentiation of β cells in vitro and to protect these cells from autoimmune attack in Type 1 diabetic ***,tremendous progress has been made in understanding βcell differentiation and producing functional β cells with different *** the coming years,we believe more clinical trials will be launched to move these technologies towards treatments to benefit diabetic patients.

关键词： pancreatic β cell diabetes mellitus insulin differentiation reprogramming iPSC transplantation

Effect of Reinforcement Corrosion Sediment Distribution Characteristics on Concrete Damage Behavior

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Computers, Materials & Continua 2019年第3期58卷 777-793页

作者： Fenghua Yuan qing Zhang xiaozhou xia Department of Engineering Mechanics Hohai UniversityNanjing210098China

Reinforcement corrosion directly affects the mechanical behavior of reinforced concrete *** electric corrosion test was conducted on a reinforced concrete test specimen,and a finite element model of the reinforcement corrosion damage was *** addition,the damage behavior of reinforced concrete under different corrosion sediment distribution characteristics and different corrosion rates was *** was noted that when corrosion sediments are in a“semiellipse+semicircle”distribution,the results of numerical calculation are consistent with those obtained experimentally,reflecting the damage characteristics of reinforced concrete test ***,the results showed that the distribution characteristics of corrosion sediments greatly influence the damage behavior of reinforced *** particular,when the corrosion sediments demonstrate a“semiellipse”distribution,reinforced concrete members may easily suffer from reinforcement *** the case of“semiellipse+semicircle”and“circle”distributions,the cohesive force between the reinforcements and concrete decreases:With the same corrosion rate,the damaged area expands with the increase in the number of reinforcements,which indicates a reduction in the cohesive force and thus,a reduction in the damage in the reinforcement *** paper analyzes in-depth the effects of reinforcement corrosion expansion on the concrete damage behavior,provides references for practical engineering.

关键词： Reinforced concrete corrosion damage numerical modeling chlorine salt corrosion durability.