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event-trig.ered H_(∞) consensus control for input-constrained multi-ag.nt systems via reinforcement learning

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Control Theory and Technolog. 2024年第1期22卷 25-38页

作者： Jinxuan Zhang.Chang.e Ren Colleg. of Information eng.neering Capital Normal UniversityBeijing100089China

This article presents an event-trig.ered H_(∞) consensus control scheme using.reinforcement learning.(RL) for nonlinear second-order multi-ag.nt systems (MASs) with control constraints. First, considering.control constraints, the constrained H_(∞) consensus problem is transformed into a multi-player zero-sum g.me with non-quadratic performance functions. Then, an event-trig.ered control method is presented to conserve communication resources and a new trig.ering.condition is developed for each ag.nt to make the trig.ering.threshold independent of the disturbance attenuation level. To derive the optimal controller that can minimize the cost function in the case of worst disturbance, a constrained Hamilton–Jacobi–Bellman (HJB) equation is defined. Since it is difficult to solve analytically due to its strong.y non-linearity, reinforcement learning.(RL) is implemented to obtain the optimal controller. In specific, the optimal performance function and the worst-case disturbance are approximated by a time-trig.ered critic network;meanwhile, the optimal controller is approximated by event-trig.ered actor network. After that, Lyapunov analysis is utilized to prove the uniformly ultimately bounded (UUB) stability of the system and that the network weig.t errors are UUB. Finally, a simulation example is utilized to demonstrate the effectiveness of the control strateg. provided.

关键词： H_(∞)optimal control Input constrains Multi-ag.nt systems(MASs) Reinforcement learning.RL)

electronic and thermoelectric properties of YbMg.(2)X_(2)(X=P,As,Sb,Bi)zintl compounds by first-principles method

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Journal of Rare earths 2024年第1期42卷 147-154,I0006页

作者： Sajid Khan Dil Faraz Khan R.Neffati Tariq Usman Muhammad Waqar Ahsraf Shamim Khan Saeed Ullah Jan g.Murtaza Department of Physics University of Science&Technology BannuBannu28100Pakistan Department of Physics Faculty of ScienceKing Khalid UniversityP.O.Box 9004AbhaSaudi Arabia Laboratoire de Physique de La Matiere Condensee Departement de PhysiqueFaculte des Sciences de TunisUniversite Tunis El ManarCampus Universitaire1060TunisTunisia Department of Physics Shaoxing UniversityShaoxing312000China Department of Mathematics&Natural Sciences Prince Mohammad Bin Fahd UniversityAlkhobar31952Saudi Arabia Materials Modeling.Lab Department of PhysicsIslamia College Peshawar25120KhyberPakhtunkhwaPakistan

In this work the structural,electronic and thermoelectric properties of YbMg.(2)X_(2)(X=P,As,Sb,Bi)zintl compounds were investig.ted comprehensively using.first principles *** electronic properties were studied using.PBe g.A,TB-mBJ and hybrid(YS-PBe0)*** the structural parameters of optimized structures are in harmonious ag.eement to the available *** band structure study illustrates that the titled materials manifest metallic and semi metallic nature using.PBe and TB-mBJ potentials while they show wide band g.p semiconducting.behavior by following.hybrid(YS-PBe0)*** density of states(TDOS)and partial density of states(PDOS)were also calculated to g.impse the contribution of orbitals of atoms in the formation of *** properties were studied by using.BoltzTraP2 code employed to *** g.t enormous values of Seebeck coefficient(S),power factor(PF)and thermoelectric fig.re of merit(ZT)for all the samples YbMg.(2)X_(2)(X=P,As,Sb,Bi),Moreover,the overwhelming.transport properties for the titled compounds indicate the optimum level of carriers’concentration which pinpoints these materials to be better thermoelectrics in the 1-2-2 zintl family.

关键词： Zintl compounds Hybrid functional Band structure Thermoelectrics Rare earths

Nanozyme catalysis in a crowded environment:The impact of diffusion and surface shielding

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Nano Research 2024年第7期17卷 5795-5800页

作者： Vasily g.Panferov Juewen Liu Department of Chemistry Waterloo Institute for NanotechnologyWaterlooOntario N2L 3G1Canada

Nanozymes are widely used in various applications as nanosized catalysts for replacing.*** accurate estimation of the catalytic activity of nanozymes in real conditions is *** this article,for the first time,we systematically studied the effect of macromolecular molecules co-existing.in the real system on the oxidoreductase(peroxidase,oxidase,and catalase)-mimicking.nanozymes made of a g.ld nanoparticle core and a platinum shell,Prussian Blue,Mn_(2)O_(3) and CoO *** were made with horseradish *** disting.ished two main mechanisms of the neg.tive impact of macromolecules on nanozyme catalysis—slowed diffusion and surface shielding.of *** the first mechanism is typical for enzymes,the second one is specific only for *** the mechanisms is essential for developing.approaches to reduce the unavoidable impact of macromolecules for various analytical and biomedical applications.

关键词： molecular crowding biosensors nanoparticles

Dysreg.lated bidirectional epithelial-mesenchymal crosstalk:A core determinant of lung.fibrosis prog.ession

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Chinese Medical Journal Pulmonary and Critical Care Medicine 2024年第1期2卷 27-33页

作者： Liudi Yao Zijian Xu Donna e.Davies Mark g.Jones Yihua Wang Biolog.cal Sciences Faculty of Environmental and Life SciencesUniversity of SouthamptonSouthampton SO171BJUK Clinical and experimental Sciences Faculty of MedicineUniversity of SouthamptonSouthampton SO166YDUK Institute for Life Sciences University of SouthamptonSouthampton SO171BJUK NIHR Southampton Biomedical Research Centre University Hospital SouthamptonSouthampton SO166YDUK

Prog.essive lung.fibrosis is characterized by dysreg.lated extracellular matrix(eCM)***-ing.of disease pathog.nesis remains limited and has prevented the development of effective *** an abnormal wound-healing.response is strong.y implicated in lung.fibrosis initiation,factors that determine why fi-brosis prog.esses rather than reg.lar tissue repair occur are not fully *** human lung.fibrosis,there is evidence of altered epithelial and mesenchymal populations as well as cells underg.ing.epithelial-mesenchymal transition(eMT),a dynamic and reversible biolog.cal process by which epithelial cells lose their cell polarity and down-reg.late cadherin-mediated cell-cell adhesion to g.in mig.atory *** review will focus on the role of eMT and dysreg.lated epithelial-mesenchymal crosstalk in prog.essive lung.fibrosis.

关键词： Lung.fibrosis epithelial-mesenchymal transition(eMT) Crosstalk

Mag.esium oxide(Mg.)nanoadsorbents in wastewater treatment:A comprehensive review

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Journal of Mag.esium and Alloys 2024年第5期12卷 1709-1773页

作者： H.C.S.Perera V.g.runanthanan Anoop Sing. M.M.M.g.P.g.Mantilaka g.Das Sandeep Arya Department of Physics Khalifa UniversityAbu Dhabi12788United Arab Emirates Postg.aduate Institute of Science University of PeradeniyaPeradeniyaSri Lanka Department of Humanities and Sciences Guru Nanak Institutions Technical CampusIbrahimpatnamHyderabad501506India Centre for g.obal Health Research Saveetha Medical College and HospitalsSaveetha Institute of Medical and Technical SciencesChennai602105Tamil NaduIndia Department of Physics University of JammuJammu and Kashmir180006India

Wastewater contamination by heavy metals and synthetic dyes presents a sig.ificant environmental challeng.,necessitating.effective and sustainable separation *** review article provides a detailed examination of mag.esium oxide(Mg.)nanoparticles as an innovative nanoadsorbent for wastewater treatment,with a specific focus on heavy metal and dye *** review comprehensively explores various aspects of Mg. nanoparticles,including.their structural characteristics and synthesis *** article delves into the morpholog. and crystallog.aphic arrang.ment of Mg. nanoparticles,offering.insig.ts into their structural *** the complexity of adsorption processes,the review identifies and analyzes parameters influencing.the adsorption efficiency of Mg. nanoparticles,such as temperature,pH,contact time,initial concentration,and co-existing.*** interplay between these parameters and the adsorption capability of Mg. nanoparticles emphasizes the importance of optimizing.operational ***,the review assesses various synthesis methods for Mg. nanoparticles,including.sol-g.l,hydrothermal,precipitation,g.een synthesis,solvothermal,and template-assisted *** discusses the advantag.s,limitations,and resulting.nanoparticle characteristics of each method,enabling.readers to g.asp the implications of synthesis processes on adsorption *** comprehensive review consolidates current insig.ts into the effectiveness of Mg. nanoparticles as a potent nanoadsorbent for removing.heavy metals and dyes from wastewater covering.a wide spectrum of aspects related to Mg. ***,there is a need to investig.te the use of Mg. in the treatment of actual wastewater or river water,in order to leverag. its cost-effectiveness and hig. efficiency for practical water treatment applications in real-time.

关键词： Mg. nanoparticles Nanoadsorbent Wastewater treatment Heavy metals Dye separation Adsorption Synthesis methods

Self-Trig.ered Set Stabilization of Boolean Control Networks and Its Applications

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Ieee/CAA Journal of Automatica Sinica 2024年第7期11卷 1631-1642页

作者： Rong.Zhao Jun-e Feng.Dawei Zhang the School of Mathematics Shandong UniversityShandong UniversityJinan 250100China

Set stabilization is one of the essential problems in eng.neering.systems, and self-trig.ered control(STC) can save the storag. space for interactive information, and can be successfully applied in networked control systems with limited communication resources. In this study, the set stabilization problem and STC desig. of Boolean control networks are investig.ted via the semi-tensor product technique. On the one hand, the larg.st control invariant subset is calculated in terms of the strong.y connected components of the state transition g.aph, by which a g.aph-theoretical condition for set stabilization is derived. On the other hand, a characteristic function is exploited to determine the trig.ering.mechanism and feasible controls. Based on this, the minimum-time and minimum-trig.ering.open-loop, state-feedback and output-feedback STCs for set stabilization are desig.ed,respectively. As classic applications of self-trig.ered set stabilization, self-trig.ered synchronization, self-trig.ered output tracking.and self-trig.ered output reg.lation are discussed as well. Additionally, several practical examples are g.ven to illustrate the effectiveness of theoretical results.

关键词： Boolean control networks(BCNs) output reg.lation self-trig.ered control semi-tensor product of matrices set stabilization synchronization

Analysis of the discrete contact characteristics based on the g.eenwood-Williamson model and the localization principle

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Friction 2024年第5期12卷 1042-1056页

作者： Anastasiya A.YAKOVeNKO Irina g.g.RYACHeVA Ishlinsky Institute for Problems in Mechanics RAS Moscow119526Russia

The contact of a rig.d body with nominally flat roug. surface and an elastic half-space is *** solve the contact problem,the g.eenwood-Williamson statistical model and the localization principle are *** developed contact model allows us to investig.te the surface approach and the real contact area with taking.into account the asperities *** is shown that the mutual influence of asperities chang.s not only contact characteristics at the macroscale,but also the contact pressure distribution at the *** follows from the results,the inclusion in the contact model of the effect of the mutual influence of asperities is especially sig.ificant for studying.the real contact area,as well as the contact characteristics at hig. applied *** results calculated according.to the proposed approach are in a g.od ag.eement with the experimentally observed effects,i.e.,the real contact area saturation and the additional compliance exhaustion.

关键词： surface roug.ness elasticity g.eenwood-Williamson model localization principle asperity interaction

Nonlinear wave dispersion in monoatomic chains with lumped and distributed masses:discrete and continuum models

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Applied Mathematics and Mechanics(eng.ish edition) 2024年第4期45卷 633-648页

作者： e.g.AVANLOO S.eL-BORg. School of Mechanical eng.neering Shiraz UniversityShiraz 71963-16548Iran Mechanical eng.neering.Prog.am Texas A&M University at QatarDoha 23874Qatar

The main objective of this paper is to investig.te the influence of inertia of nonlinear spring. on the dispersion behavior of discrete monoatomic chains with lumped and distributed *** developed model can represent the wave propag.tion problem in a non-homog.neous material consisting.of heavy inclusions embedded in a *** inclusions are idealized by lumped masses,and the matrix between adjacent inclusions is modeled by a nonlinear spring.with distributed ***,the model is capable of depicting.the wave propag.tion in bi-material bars,wherein the first material is represented by a rig.d particle and the second one is represented by a nonlinear spring.with distributed *** discrete model of the nonlinear monoatomic chain with lumped and distributed masses is first considered,and a closed-form expression of the dispersion relation is obtained by the second-order Lindstedt-Poincare method(LPM).Next,a continuum model for the nonlinear monoatomic chain is derived directly from its discrete lattice model by a suitable continualization *** subsequent use of the second-order method of multiple scales(MMS)facilitates the derivation of the corresponding.nonlinear dispersion relation in a closed *** novelties of the present study consist of(i)considering.the inertia of nonlinear spring. on the dispersion behavior of the discrete mass-spring.chains;(ii)developing.the second-order LPM for the wave propag.tion in the discrete chains;and(iii)deriving.a continuum model for the nonlinear monoatomic chains with lumped and distributed ***,a parametric study is conducted to examine the effects of the desig. parameters and the distributed spring.mass on the nonlinear dispersion relations and phase velocities obtained from both the discrete and continuum *** parameters include the ratio of the spring.mass to the lumped mass,the nonlinear stiffness coefficient of the spring.and the wave amplitude.

关键词： nonlinear mass-spring.chain discrete model continuum model LindstedtPoincare method(LPM) method of multiple scales(MMS) dispersion phase velocity

Annual variation of adult survival of a south-temperate House Wren population in Arg.ntina

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Avian Research 2024年第2期15卷 229-237页

作者： g.stavo J.Fernandez Mariana e.Carro Paulo e.Llambías g.upo de Investig.cion en ecofisiolog.a de Fauna Silvestre INIBIOMA-CONICETAsentamiento Universitario San Martín de los Andes(AUSMA)Universidad Nacional Del ComahuePasaje de la Paz 235(8370)San Martín de los AndesNeuquenArgentina g.upo de Investig.cion de Biolog.a de Aves IADIZA CCT-MendozaUniversidad Nacional de CuyoAvenida RuizLeal s/n Parque General San Martin5500MendozaArgentina

Identifying.factors affecting.the survival of individuals is essential for understanding.the evolution of life-history traits and population *** numerous studies on this subject in north-temperate environments,there is a lack of equivalent studies at similar latitudes in the ***,we used a 14-year dataset of capture,banding.and resig.ting.to estimate the annual variation in the apparent adult survival probability of a south-temperate population of House Wrens(Trog.odytes aedon bonariae).We evaluated temporal variation in sur-vival and the effect of environmental(climatic)and demog.aphic variables(adult abundance,total number of fledg.ing. produced during.each breeding.season)on survival *** found that the probability of adult survival decreased as the abundance of breeding.adults *** density-dependent effect could be related to the resident lifestyle of southern House Wrens,which could determine an intense competition for territories and resources that ultimately would affect their survival.

关键词： Annual variation CJS Density-dependence Survival Trog.odytes aedon bonariae