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Cluster-Delay Consensus for Second-Order Nonlinear Multi-agent Systems

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Journal of Systems Science & Complexity 2020年第2期33卷 333-344页

作者： HUANG Jun WEN Guoguang PENG Zhaoxia zhang yunlong Department of Mathematics Beijing Jiaotong UniversityBeijing 100044China School of Transportation Science and Engineering Beihang UniversityBeijing 100191China

This paper investigates the second-order nonlinear multi-agent systems subject to the cluster-delay *** multi-agent systems consist of leader and agents,whose dynamics are second-order *** objective is that the agents track the leader asymptotically with different time delays,i.e.,the agents in different groups reach delay consensus,while the agents in the same group reach identical *** guarantee the cluster-delay consensus for the second-order multi-agent systems,a new control protocol is *** some corresponding conditions for cluster-delay consensus are derived by using Lyapunov directed method and matrix ***,the effectiveness of the theoretical analysis results are verified by some numerical simulations.

关键词： Cluster consensus multi-agent systems second-order nonlinear dynamics time delay

Observer-Based Intra-Cluster Lag Consensus of Multi-Agent Systems via Intermittent Adaptive Pinning Control

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Journal of Systems Science & Complexity 2023年第5期36卷 1809-1829页

作者： zhang yunlong WEN Guoguang RAHMANI Ahmed PENG Zhaoxia WEN Shiping CRIStAL UMR CNRS 9189Centrale LilleVilleneuve d'Ascq 59651France Department of Mathematics Beijing Jiaotong UniversityBeijing 100044China School of Transportation Science and Engineering Beihang UniversityBeijing 100191China Centre for Artificial Intelligence(CAI) University of Technology SydneyAustralia

The intra-cluster lag consensus means that the agents in the same cluster can achieve lag consensus asymptotically while the agents in different clusters can achieve different *** this paper,the authors investigate the observer-based intra-cluster lag consensus problems of multi-agent systems(MASs)with general linear dynamics and nonlinear dynamics via intermittent adaptive pinning *** interaction network is considered to be weakly connected,i.e.,it is not necessary to be strongly connected,in-degree balanced or contain a directed spanning *** realise the intra-cluster lag consensus,a class of observers is designed to estimate the states of *** a class of observer-based intermittent adaptive pinning control protocols is proposed according to the difference that the agents receive information ***,the pinning gains are designed to be intermittent adaptive and have an exponential convergence rate,which will effectively reduce communication costs,avoid the pinning gains being larger than those needed in real applications and guarantee the pinning gains quickly converge to steady ***,some sufficient consensus criteria are derived and rigorous proofs are given based on matrix theory and Lyapunov stability ***,the effectiveness for the proposed intermittent adaptive pinning control strategy is validated by a numerical simulation.

关键词： Lag consensus multi-agent systems intermittent adaptive pinning control state observer

Platelet rich plasma-complexed hydrogel glue enhances skin wound healing in a diabetic rat model

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BIOCELL 2022年第5期46卷 1329-1338页

作者： yunlong zhang JINGWEI zhang YU ZHU BIN CAI Department of Orthopedic Surgery Shanghai Jiao Tong University Affiliated Sixth People’s HospitalShanghai200233China Department of Orthopedics Shanghai Fengxian District Central Hospital/Southern Medical University Affiliated Fengxian HospitalShanghai201400China

Diabetic patients often exhibit delayed or incomplete progress in the healing of acute wounds,owing to poor blood ***-rich plasma(PRP)has attracted much attention as a means to improve wound healing,because it contains high growth factor ***,the burst-like release of PRP growth factors results in a short halflife of these therapeutic proteins,thus greatly limiting the therapeutic *** this study,we prepared PRP from human umbilical cord blood and developed an in situ photocrosslinkable PRP hydrogel glue(HNPRP)by adding a photoresponsive hyaluronic acid(HA-NB)into *** HNPRP hydrogel allowed for controlled release of plateletderived growth factor-BB(PDGF-BB)and transforming growth factor-β(TGF-β)for up to 28 *** vitro cell culture showed that HNPRP promoted migration of fibroblasts and keratinocytes as well as PRP and did not reveal the advantages of ***,in a diabetic rat skin wound model,HNPRP treatment promoted faster wound ***,the HNPRP group,compared with the control,PRP and hydrogel only groups,showed significantly greater re-epithelialization and numbers of both newly formed and mature blood *** HNPRP group also displayed higher collagen formation than did the control *** conclusion,HNPRP enhances angiogenesis and skin regeneration and consequently achieves faster wound healing,thus extending its potential for clinical applications to treat diabetic skin wounds.

关键词： Platelet-rich plasma Wound healing Umbilical cord blood Hydrogel glue Angiogenesis

Study on the temperature dependence of BGO light yield

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Science China(Physics,Mechanics & Astronomy) 2014年第10期57卷 1898-1901页

作者： WANG PeiLong zhang yunlong XU ZiZong WANG XiaoLian State Key Laboratory of Particle Detection and Electronics University of Science and Technology of China

The temperature dependence of BGO coupled with photomultiplier tube R5610A-01 was studied in the range of-30–30℃. The temperature coefficient of the BGO and R5610 A as a whole was tested to be-1.82%/℃. And the temperature coefficient of the gain of the R5610 A is-0.44%/℃ which was tested in the same situation using a blue LED. Thus the temperature coefficient of BGO's light yield can be evaluated as-1.38%/℃.

关键词： BGO light yield temperature dependence PMT

A temporal framework for building up of healthy soils

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Frontiers of Agricultural Science and Engineering 2024年第2期11卷 292-296页

作者： Junling zhang Jiangzhou zhang yunlong zhang Guangzhou WANG State Key Laboratory of Nutrient Use and Management College of Resources and Environmental SciencesNational Academy of Agriculture Green DevelopmentChina Agricultural UniversityBeijing 100193China Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources College of GrasslandResources and EnvironmentInner Mongolia Agricultural UniversityHohhot 010018China Key Laboratory of Grassland Management and Utilization Ministry of Agriculture and Rural Affairs of the People’s Republic of ChinaCollege of Grassland Science and TechnologyChina Agricultural UniversityBeijing 100193China

Healthy soils are vital for the diverse services provided by ecosystems to human society~[1], such as provisioning(food,fiber, timber, and fuel), regulation(climate, disease, and natural hazards), waste treatment, nutrient cycling, and cultural services. Soil has a three phase system and the interactions between soil chemical, biological, and physical attributes determine functions(hydraulic, thermal, and gas fluxes).

关键词： soils soil cycling

Tensile Properties and Wear Resistance of Mg Alloy Containing High Si as Implant Materials

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Journal of Renewable Materials 2023年第4期11卷 1977-1989页

作者： Mengqi Cong Yang zhang yunlong zhang Xiao Liu Yalin Lu Xiaoping Li Key Laboratory of Advanced Materials Design and Additive Manufacturing of Jiangsu Province Jiangsu University of TechnologyChangzhou213001China

Magnesium alloy has been considered as one of the third-generation biomaterials for the regeneration and support of functional bone *** a regeneration implant material with great potential applications,in-situ Mg_(2)Si phase reinforced Mg-6Zn cast alloy was comprehensively studied and expected to possess excellent mechanical properties via the refining and modifying of Mg_(2)Si *** present study demonstrates that the primary and eutectic Mg_(2)Si phase can be greatly modified by the yttrium(Y)*** size of the primary Mg_(2)Si phases can be reduced to~20μm with an addition of 0.5 wt.%*** phenomenon is mainly attributed to the poisoning effect of the Y ***,wear resistance and tensile properties of the ternary alloy have also been improved by the Y ***-6Zn-4Si-0.5Y alloy exhibits optimal tensile properties and wears *** ultimate tensile strength and the elongation of the alloy with 0.5 wt.%Y are 50%and 65%higher than those of the ternary alloy,*** Y addition(1.0 wt.%)deteriorates the tensile properties of Mg-Zn-Si *** improvement of the tensile properties is mainly due to the modification of primary and eutectic Mg_(2)Si phases as well as the solid solution strengthening of the Y *** study provides a certain implication for the application of Mg-Zn-Si alloys containing Y elements as regeneration implants.

关键词： Magnesium alloys Mg2Si phase microstructure regeneration mechanical properties

Preparation of porous semi-IPN temperature-sensitive hydrogel-supported nZVI and its application in the reduction of nitrophenol

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Journal of Environmental Sciences 2019年第8期31卷 93-102页

作者： Lixia Li Ruiwei Wang Xiaodong Xing Wenqiang Qu Shutong Chen yunlong zhang School of Environment and safety engineering Jiangsu University School of Chemical Engineering Nanjing University of Science and Technology

Nanoscale zero-valent iron(n ZVI) particles supported on a porous, semi-interpenetrating(semi-IPN), temperature-sensitive composite hydrogel(PNIPAm-PHEMA). n ZVI@PNIPAmPHEMA, was successfully synthesized and characterized by FT-IR, SEM, EDS, XRD and the weighing method. The loading of nZVI was 0.1548 ± 0.0015 g/g and the particle size was30–100 nm. NZVI was uniformly dispersed on the pore walls inside the *** of the well-dispersed n ZVI, the highly porous structure, and the synergistic effect of PNIPAm-PHEMA, nZVI@PNIPAm-PHEMA showed excellent reductive activity and wide p H applicability. 95% of 4-NP in 100 m L of 400 mg/L 4-NP solution with initial p H 3.0–9.0 could be completely reduced into 4-AP by about 0.0548 g of fresh supported n ZVI at 18–25 °C under stirring(110 r/min) within 45 min reaction time. A greater than 99% 4-NP degradation ratio was obtained when the initial p H was 5.0–9.0. The reduction of 4-NP by nZVI@PNIPAm-PHEMA was in agreement with the pseudo-first-order kinetics model with Kobsvalues of 0.0885–0.101 ***@PNIPAm-PHEMA was able to be recycled, and about 85% degradation ratio of 4-NP was obtained after its sixth reuse cycle. According to the temperature sensitivity of PNIPAmPHEMA, n ZVI@PNIPAm-PHEMA exhibited very good storage stability, and about 88.9%degradation ratio of 4-NP was obtained after its storage for 30 days. The hybrid reducer was highly efficient for the reduction of 2-NP, 3-NP, 2-chloro-4-nitrophenol and 2-chloro-4-nitrophenol. Our results suggest that PNIPAm-PHEMA could be a good potential carrier, with n ZVI@PNIPAm-PHEMA having potential value in the application of reductive degradation of nitrophenol pollutants.

关键词： Porous semi-IPN temperature sensitive hydrogel Supported nanoscale zero-valent iron Reductive degradation Nitrophenol Storage stability

Strong Interaction Between Redox Mediators and Defect-Rich Carbons Enabling Simultaneously Boosted Voltage Windows and Capacitance for Aqueous Supercapacitors

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Energy & Environmental Materials 2024年第4期7卷 269-276页

作者： Lu Guan Yifan Zhu Yi Wan Mengdi zhang Qiang Li Xiaoling Teng yunlong zhang Hao Yang Yan zhang Han Hu Mingbo Wu State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China College of Physics University-Industry Joint Center for Ocean Observation and Broadband CommunicationQingdao UniversityQingdao 266071China

Energy density,the Achilles’heel of aqueous supercapacitors,is simultaneously determined by the voltage window and specific capacitance of the carbon materials,but the strategy of synchronously boosting them has rarely been ***,we demonstrate that the rational utilization of the interaction between redox mediators(RMs)and carbon electrode materials,especially those with rich intrinsic defects,contributes to extended potential windows and more stored charges *** 4-hydroxy-2,2,6,6-tetramethylpiperidinyloxyl(4OH-TEMPO)and intrinsic defect-rich carbons as the RMs and electrode materials,respectively,the potential window and capacitance are increased by 67%and sixfold in a neutral ***,this strategy could also be applied to alkaline and acid *** first-principle calculation and experimental results demonstrate that the strong interaction between 4OH-TEMPO and defectrich carbons plays a key role as preferential adsorbed RMs may largely prohibit the contact of free water molecules with the electrode materials to terminate the water splitting at elevated *** the RMs offering weaker interaction with the electrode materials,the water splitting still proceeds with a thus sole increase of the stored *** results discovered in this work could provide an alternative solution to address the low energy density of aqueous supercapacitors.

关键词： defect-rich carbons redox mediators strong interaction supercapacitors voltage windows

Construction interlayer structure of hydrated vanadium oxides with tunable P-band center of oxygen towards enhanced aqueous Zn-ion batteries

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Advanced Powder Materials

Advanced Powder Materials 2024年第2期3卷 9-16页

作者： Ziyi Feng yunlong zhang Zhanming Gao Dida Hu Hanmei Jiang Tao Hu Changgong Meng Yifu zhang School of Chemistry Dalian University of TechnologyDalian 116024China Department of Materials Science and Engineering National University of SingaporeSingapore 117574Singapore College of Environmental and Chemical Engineering Dalian UniversityDalian116622China

Layered materials with adjustable framework,as the most potential cathode materials for aqueous rechargeable zinc ion batterie,have high capacity,permit of rapid ion diffusion,and charge transfer *** studies have widely investigated their preparation and storage mechanism,but the intrinsic relationship between the structural design of layered cathode materials and electrochemical performance has not been well *** this work,based on the first principles calculations and experiments,a crucial strategy of pre-intercalated metalions in vanadium oxide interlayer with administrable p-band center(ε_(p))of O is explored to enhance Zn^(2+)*** regulation of the degree of covalent bond and the average charge of O atoms varies the binding energy between Zn^(2+)and O,thus affecting the intercalation/de-intercalation of Zn2þ.The present study demonstrates thatεp of O can be used as an important indicator to boost Zn2þstorage,which provides a new concept toward the controlled design and application of layered materials.

关键词： Layered materials P-band center(ε_(p))of O Metal-ion intercalation Zn-ion storage